WO2016131174A1

WO2016131174A1 - Production line for producing national-standard magnesium alloy ingots on the basis of magnesium alloy waste material

Info

Publication number: WO2016131174A1
Application number: PCT/CN2015/073191
Authority: WO
Inventors: 谭何易; 唐伦圆
Original assignee: 谭何易
Priority date: 2015-02-16
Filing date: 2015-02-16
Publication date: 2016-08-25
Also published as: CN107208183B; US20180023169A1; CN107208183A

Abstract

Provided is a production line for producing national-standard magnesium alloy ingots on the basis of magnesium alloy waste material, comprising: a pretreatment system (1), a melting and refining system (3), and a casting system (5); magnesium alloy waste material passes in sequence through the pretreatment system (1), the melting and refining system (3), and the casting system (5), resulting in magnesium alloy ingots that conform to national standards. The production line for producing national-standard magnesium alloy ingots on the basis of magnesium alloy waste material processes magnesium alloy waste material, passing same through a pretreatment system (1), a preheating system (2), a melting and refining system (3), a thermal insulation system (4), a casting system (5), and a post-treatment system (6); coatings and impurities on the surface of the magnesium alloy waste material are removed, and the material is processed into magnesium alloy ingots conforming to national standards; the pieces of equipment of each system are well-connected, the degree of automation is high, operation is simple, and production is highly efficient; an industrialized process is thus achieved in which magnesium alloy ingots conforming to national standards are produced directly from raw materials which are 100% scrap magnesium alloy products.

Description

Production line of national standard magnesium alloy ingot based on magnesium alloy scrap

Technical field

The invention relates to a metal recycling and recycling production line, in particular to a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap.

Background technique

Magnesium is one of the most abundant light metal elements on the earth. The specific gravity of magnesium is 1.74g/cm ³ , which is only 2/3 of aluminum, 2/5 of titanium, and 1/4 of steel. Magnesium alloy is an alloy composed of other elements added to magnesium. The magnesium alloy has low density, high specific strength and specific stiffness, and has good electromagnetic shielding, damping, vibration damping, machinability and low processing cost. Processing energy is only 70% of aluminum alloy and easy to recycle. Therefore, magnesium and magnesium alloys are regarded as green engineering materials in the 21st century, widely used in automotive, aerospace, 3C industry, power tools, optical equipment, sporting goods and Communication and other fields. At present, with the development of lightweight, low energy consumption and low pollution in the global manufacturing industry, magnesium alloy parts are widely used in place of plastic, aluminum alloy and even steel parts.

According to the China Nonferrous Metals Association, the output of primary magnesium in China was 769,700 tons in 2013, an increase of 10.22% year-on-year. The output of magnesium alloy was 297,800 tons, an increase of 43.52%. However, the sharp increase in magnesium alloy production is bound to cause a rapid increase in magnesium alloy scrap. The regeneration of magnesium alloy scrap has the advantages of high regeneration rate and low energy consumption. The regeneration rate can reach over 95%, and the energy consumption for recycling and regeneration is only 5% to 10% of the energy consumption of the original magnesium production. Therefore, the reasonable recycling of magnesium alloy waste is directly It affects the rationality and sustainability of the development of the magnesium alloy industry, and is of great significance for reducing environmental pollution, saving energy, reducing the cost of magnesium alloys, and extending the life cycle of magnesium alloys.

In the process of recycling magnesium alloy scrap, the first step is to classify the magnesium alloy scrap. By recycling the waste, old, residual materials and chips of magnesium alloy to ensure the grade and full utilization of the recycled materials, reduce costs. The international standard for the classification and classification of magnesium and magnesium alloys divides the waste into eight grades, as shown in Table A.

Table A Magnesium and Magnesium Alloy Waste Grading

Magnesium alloy scrap is recycled on the one hand to recover spent or scrapped magnesium alloy products, and on the other hand to recover scrap and chips from magnesium and magnesium alloys. Grades 1 to 7 are scraps and chips for magnesium and magnesium alloys, which can be directly smelted for Class 1 waste - cleaning classified waste; for Class 2 waste - clean and sorted waste, but mixed with wood inclusions and The scrap of steel inclusions must be removed before the inclusions can be smelted; for grade 3 waste - paint and oil coated grade 1 and 2 waste must be removed after the paint and oil are removed; for 4 Grades and 5 grades of waste, chips, debris, debris, etc. contain more oxides and are highly polluted, special treatment must be carried out when recycling; for wastes such as 6 and 7 waste-slag, the volume is too small, and the recovery is too small. Classification and remelting regeneration are difficult, and currently there is basically no recycling. The main recycling on the market today is the 8th grade waste - a random mixture of various grades of alloys, which is a failed or scrapped magnesium alloy product, including the wheel hub of the car, the steering wheel, the engine cylinder head, the fuselage of the aircraft, the skin, The current size of the computer and camera casing, etc., currently totals 200,000 tons/year. In the production process, the magnesium alloy products that are ineffective or scrapped are usually surfaced to improve the performance and service life of magnesium alloy products. Treatment, such as painting, anodizing, electroless plating, electroplating and surface spraying, etc., while magnesium alloy products in the process of use, the surface will form a large amount of oil, mud and oxide layer, etc., so it is more difficult to deal with 8 grade waste .

At present, there are two types of magnesium alloy scrap processing methods for the failed or scrapped magnesium alloy products. One method is to roughly treat the surface of the magnesium alloy scrap, remove a small amount of impurities on the surface of the magnesium alloy scrap, and then use it as a fireworks. A raw material such as a color former, a desulfurizing agent, and a non-standard ingot; another method is to make a magnesium alloy scrap into a magnesium alloy ingot for other uses. The above two methods reuse magnesium alloy scrap. However, the first method is used for the degradation of magnesium alloy waste or as a raw material for production. The use is disposable, non-recyclable, and extremely resourceful. Waste, so the second way to deal with magnesium alloy scrap is now more advocated.

For the failure or scrapped magnesium alloy products, the process of recycling magnesium alloy ingots of this type is generally: magnesium alloy waste → determining the purity of the waste → determining the type of waste → cleaning the coating and debris → preparing the material → remelting → In addition to impurities → addition of alloying elements → refining → analysis → pouring → magnesium alloy ingots. There are two methods for this process: one method is to classify the recovered magnesium alloy waste and directly melt it. For example, Japan’s Tateishi et al. found that when the thin-walled magnesium alloy coated on the surface is recycled, if it is first sent to the melting furnace Adding equal weight of primary magnesium alloy material, adding waste after melting, can reduce harmful gas emissions, impurities are more easily removed, and the mechanical properties and corrosion resistance of the magnesium alloy ingot obtained by smelting remain unchanged; The method comprises the following steps: classifying, crushing and pickling the recovered magnesium alloy waste, removing the surface coating layer, and removing all kinds of impurities in the alloy melt by a flux refining method and an argon gas bottom blowing method. The second method has low development cost and short cycle, and the actual production can reduce the investment of the recycling equipment cost, so the second method is more practical. The requirements for the national standard magnesium alloy ingot are as follows (see Table B national standard magnesium alloy ingot):

Table B national standard magnesium alloy ingot

However, in the prior art, magnesium alloy scrap cannot be used as a direct raw material for the production of a national standard magnesium alloy ingot, and the main reason is due to the difficulty in recycling the magnesium alloy scrap. There are various problems in the existing magnesium alloy scrap recycling production line: 1. The magnesium alloy scrap can not directly obtain the national standard magnesium alloy ingot through the production process, and various fluxes and decontaminants need to be added in the process to reduce the impurity content in the magnesium alloy ingot. In order to obtain the national standard magnesium alloy ingots in line with national requirements. 2. Magnesium alloy scrap coating layer and impurity treatment are not clean, and the loss is large, and the utilization rate of magnesium alloy scrap is low. For example, Chinese patent CN 101947705A discloses a method for producing magnesium alloy welding wire by using magnesium alloy casting waste, and the method is directly adopted. The method of soaking is pickled, the pickling effect is poor and the consistency is low, and the efficiency is low. For example, Chinese patent CN 101736160A discloses a method for recovering low-grade scrap of magnesium alloy, which adopts a stainless steel container for containing waste and acid, and is stirred by a mixer. Pickling three times for 30 minutes each time, however, the method has problems such as uneven stirring, uneven pickling, easy jamming of the mixer, long acid pickling time, and large loss of waste in the pickling process. 3. After the magnesium alloy scrap is pickled or alkali washed, it directly enters the subsequent processing, so that the pretreated magnesium alloy scrap is entrapped with moisture, resulting in gas inclusion in the subsequent processing, and the magnesium alloy scrap reprocessing is unsafe and the utilization rate is lowered. 4. During the melting and casting process, the magnesium alloy liquid (melt) is not protected, so that the magnesium alloy liquid (melt) is in contact with the air, and a second oxidation occurs, so that the impurity component of the magnesium alloy ingot is increased by the casting. Meet the requirements of national standard magnesium alloy ingots. In addition, in the process of recycling magnesium alloy scrap, the prior art cannot provide a good solution to the waste residue, waste water and waste gas generated in the production process, or fail to meet environmental protection requirements, resulting in environmental pollution and waste of resources, such as Chinese patents. CN101338378A discloses a process for remelting and casting a waste magnesium alloy part to obtain a magnesium alloy ingot, and has no treatment method for waste liquid; the magnesium and magnesium alloy resource recycling system provided by Chinese patent CN101096732A, which system generates magnesium and magnesium alloy in the production process. The waste residue, waste water and waste gas are supplied to the magnesium slag brick factory, the calcium carbonate plant, the coal water slurry plant, the waste heat steam boiler, and the living office heating circulation cooling system for reuse, but when the waste residue and waste water are reused, no waste residue is extracted. The magnesium ions in the waste water will cause the magnesium in the waste residue and waste water to exceed the standard, and when it is reused again, it will cause secondary pollution and does not meet the environmental protection requirements.

More importantly, all the current magnesium alloy ingots produced by magnesium alloy scraps, especially the national standard magnesium alloy ingots, cannot avoid adding a higher proportion of high-purity magnesium to meet the requirements of the national standards for the melt composition, and the existing production lines are unable to Achieve high-efficiency, high-value recycling and reuse of magnesium alloy scrap, especially scrap magnesium alloy scrap.

In view of the above, there is an urgent need for a magnesium alloy scrap that can directly use the magnesium alloy product of the failed or scrapped magnesium alloy to directly produce the national standard magnesium alloy ingot, improve the utilization rate of the magnesium alloy scrap, and be safe and environmentally friendly.

Summary of the invention

In view of the above problems existing in the prior art, the object of the present invention is to provide a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap, and to efficiently remove the coating layer and impurities on the surface of the magnesium alloy scrap by improving the equipment in the production line. Magnesium alloy scrap cleaning consistency in pickling and water washing process, improve cleaning efficiency, and reduce the loss of magnesium alloy scrap in the cleaning process; to directly produce magnesium alloy ingots using magnesium alloy scrap, improve the utilization rate of magnesium alloy scrap Save resources and protect the environment.

In order to achieve the above object, the technical solution adopted by the present invention is as follows:

A production line for producing magnesium alloy ingots based on magnesium alloy scraps, comprising: a pretreatment system, a melt refining system and a gating system, and the magnesium alloy scraps are sequentially subjected to a pretreatment system, a melt refining system and a gating system to produce a national standard magnesium alloy ingot.

Preferably, the magnesium alloy scrap is a scrapped magnesium alloy product selected from the group consisting of an automobile hub, a steering wheel, an engine cylinder head, an aircraft fuselage, a skin, a computer, a mobile phone, a camera, and a casing of a power tool. mixture.

Among them, the pretreatment system includes the high pressure cleaning device and the pickling production line that the inventor pioneered, and the magnesium alloy waste can be directly used as the raw material of the magnesium alloy national standard ingot after being treated by the high pressure cleaning device and the pickling production line.

As a preferred embodiment, the pickling line comprises: a feeding device, a pickling zone and a water washing zone, and the magnesium alloy waste is contained in the holding device. The pickling zone and the washing zone are set independently;

The material flow in the pickling production line: after the magnesium alloy waste is put into the feeding device, the picking device successively enters the pickling area and the washing area to perform pickling and washing.

As another preferred embodiment, the pickling line includes: a feeding device, a pickling zone, a water washing zone and a lifting device, wherein: the feeding device is filled with magnesium alloy scrap, the pickling zone and the washing zone are independently set, and the lifting is carried out. The device drives the holding device and moves the holding device between the pickling zone and the washing zone;

The material flow in the pickling production line: after the magnesium alloy waste is put into the feeding device, the feeding device driven by the lifting device sequentially enters the pickling zone and the washing zone for pickling and washing.

The preferred scheme for any of the above pickling lines is as follows:

Preferably, the magnesium alloy scrap is pickled in the pickling zone and rinsed in the water wash zone under the self-rotation of the holding device.

Preferably, the feeding device is an electrically driven drum, the drum contains magnesium alloy scrap, and is provided with a rotating shaft, the rotating shaft penetrates the drum; in order to ensure the smooth rotation of the drum, the rotating shaft is coaxially arranged with the center line of the drum; Through the rotation of the rotating shaft; at this time, the magnesium alloy scrap in the drum is randomly flipped with the movement of the drum to ensure that the magnesium alloy scrap is in full contact with the cleaning liquid, and the impurities on the surface of the magnesium alloy scrap (especially in the groove) are more in the process of turning over. Easy to fall off, thus maintaining consistency of cleaning and improving cleaning efficiency.

More preferably, the drum is provided with a plurality of through holes having a diameter smaller than that of the magnesium alloy scrap; preferably smaller than the maximum directional dimension of the smallest piece of magnesium alloy scrap; to prevent the magnesium alloy scrap from passing through during pickling and rinsing The hole is detached and the loss is reduced, and the cleaning liquid in the pickling zone and the washing zone can be entered into the drum from the through hole and fully contacted with the magnesium alloy scrap in the drum to ensure the uniformity of the magnesium alloy scrap in the pickling and washing process. Reduce overall pickling and washing time.

More preferably, the through hole has a pore diameter of 5 to 30 mm.

More preferably, the drum is a cylinder or a regular polygonal cylinder.

More preferably, the drum is made of a titanium alloy sheet, an engineering plastic sheet or other acid resistant high strength sheet, preferably welded with a titanium alloy.

More preferably, the drum includes a material inlet and outlet and a cover plate through which the material inlet and outlet can be opened and closed.

More preferably, the cover is movably capped to the material inlet and outlet. In other words, when the drum is fed or discharged, the cover is opened, and the material inlet and outlet are open; when the drum enters the rotation process, the cover is closed, the material inlet and outlet are closed, and the drum can enter the rotating state.

More preferably, one side of the cover is movably connected to the drum wall on the side of the material inlet and outlet, preferably hinged.

More preferably, the drum is provided with a handle, and the handle is coaxial or parallel with the center line of the drum; as a preferred embodiment, the handle is disposed outside the drum and fixedly connected with the drum, and by rotating the handle, the rotation of the drum can be controlled by The direction of the material inlet and outlet on the drum during the feeding and discharging is controlled to ensure that the material inlet and outlet are facing upward when feeding, and the material inlet and outlet are facing downward when discharging.

More preferably, the drum is electrically driven by a drive motor disposed at one end of the pickling zone and/or the water washing zone, and the drive motor rotates by rotating the drive drum by the drive shaft. As a preferred embodiment, the driving motor driving drum rotation can be realized by a pair of transmission gears respectively arranged on the rotating shaft and the driving motor, and the driving motor drives the transmission gear pair to rotate, thereby driving the rotating shaft to realize the rotation of the drum. . As a further preferred embodiment, the driving motor is two, which are respectively disposed at one end of the pickling zone and the water washing zone, and the two driving motors drive the drums in the same manner, so the corresponding mating gears have the same structure. As a preferred embodiment, the transmission gear is located at one end of the rotating shaft.

Further preferably, the two ends of the rotating shaft are respectively provided with rolling bearings to reduce the resistance when the drum rotates.

More preferably, the two ends of the rotating shaft are respectively provided with lifting elements that are movably connected with the hoisting device; as a preferred embodiment, the lifting element is a bearing that is sleeved with the rotating shaft, and the diameter thereof is not greater than that of the lifting device. Hang hook diameter.

As a preferred embodiment, the rotating shaft sequentially sets or mounts a transmission gear, a rolling bearing, a lifting component, a drum, a lifting component, and a rolling bearing. More preferably, the shaft is made of a titanium alloy or other acid-resistant metal and its alloy material.

Preferably, the hoisting device is a hoisting assembly that is electrically driven and provided with a hook, and the hoisting hook cooperates with the hoisting component of the hopper to realize the driving of the hopper to complete the charging, the pickling zone, the pickling zone, The action of entering the water washing zone, the water washing zone or the cutting material; therefore, the position of the drum in the pickling zone and the washing zone is controlled by the lifting device, so that the labor intensity is reduced and the automatic control is realized.

More preferably, the lifting device is movably connected to the rotating shaft to realize the driving of the loading device by the lifting device, and more preferably, the lifting device can be activated after the lifting hook is coordinated with the rotating shaft.

More preferably, the hoisting assembly can be implemented by the prior art, and is not the focus of the present invention, and therefore will not be described again. The specific implementation structure is as follows.

In order to ensure that the magnesium alloy scrap is in full contact with the cleaning liquid during the pickling and washing process, the inventors have made structural improvements to the pickling zone and the water washing zone on the basis of the pickling line of any of the above structures, so that the pickling zone and The washing zone is adapted to the feeding device. The magnesium alloy scrap is in full contact with the acid in the pickling process, removing the oxide layer and impurities on the surface of the magnesium alloy scrap, and double washing in the water washing process to completely remove the residual acid and residue on the surface of the magnesium alloy scrap. .

Preferably, the pickling zone comprises a pickling tank, an acid feeding channel and an acid out channel, and the acid feeding channel and the acid passing channel respectively penetrate the pickling tank and communicate with the pickling tank; as a preferred embodiment, the acid passage is The connection between the pickling tank is higher than the connection between the acid passage and the pickling tank. In other words, the setting height of the acid passage is higher than the set height of the acid passage; and the acid solution in the pickling tank is controlled by the acid passage and the acid passage. Ingress and discharge, the magnesium alloy scrap is fully contacted with the acid in the pickling process to remove the oxide layer and impurities on the surface of the magnesium alloy scrap.

More preferably, the acid outlet channel extends through the side wall of the pickling tank. As a preferred embodiment, the acid passage passes through the side wall of the pickling tank and the acid passage The channel walls are tangent to the bottom wall of the pickling tank.

More preferably, the acid feed passage extends through the side wall of the pickling tank.

More preferably, the acid feed channel is a double acid channel.

More preferably, the double acid channel is two branches of the same main pipe, and the two tubes respectively penetrate different side walls of the pickling tank, so that the acid solution in the pickling tank is more uniformly mixed when the acid is fed.

More preferably, the two tubes are respectively disposed on opposite side walls of the pickling tank.

Preferably, the pickling tank volume is not less than the volume of the holding device; in other words, the volume of the pickling tank is greater than the volume of the drum.

More preferably, the length direction dimension of the pickling tank is 20 to 50 cm larger than the height direction dimension of the drum.

More preferably, the width direction dimension of the pickling tank is 20 to 100 cm larger than the diameter of the drum.

More preferably, the height direction dimension of the pickling tank is 10 to 100 cm larger than the radius of the drum.

More preferably, the pickling tank is provided with a pickling tank cover to prevent the acid solution from volatilizing when there is no drum in the pickling tank, reducing the loss of raw materials and reducing atmospheric pollution.

More preferably, the pickling tank is made of an acid-resistant material such as engineering plastic or fiberglass.

Preferably, both sides of the pickling tank are provided with a bearing seat, and the bearing seat is installed at a position coaxial with the center line of the longitudinal direction of the pickling tank; as a preferred embodiment, the bearing seat is a shaft The shape-matched concave seat, when the roller is pickled in the pickling zone, the two rotating bearings on the rotating shaft are respectively placed on the two bearing seats, thereby ensuring that the relative positions of the roller and the pickling tank are unchanged, and the roller is lowered ( The feeding device is resistant to rotation; in addition, the filling device can be rotated after being placed on the bearing seat to further ensure safe operation.

Preferably, the water washing zone comprises a rinsing unit, a blanking unit and a spray unit, and the pickled magnesium alloy scrap passes through the rinsing unit, the blanking unit and the spray unit in turn, and the magnesium alloy scrap is doubled by the rinsing unit and the spray unit. The water washing can make the magnesium alloy scrap fully contact with the cleaning liquid in the washing process of the washing zone, and thoroughly remove the residual acid and residue on the surface of the magnesium alloy scrap.

Preferably, the rinsing unit is a rinsing tank, and the drum in the hopper is self-rotating and rinsing the magnesium alloy waste in the rinsing tank.

More preferably, the volume of the rinsing tank is not less than the volume of the holding device.

More preferably, the depth of the rinsing tank is greater than the radius of the drum to facilitate rotation of the drum within the rinsing tank.

More preferably, both ends of the rinsing pool are provided with a bearing seat, the bearing seat mounting position is coaxial with the center line of the longitudinal direction of the rinsing pool; as a preferred embodiment, the bearing seat is matched with the shape of the rotating shaft The concave seat, when the drum is rinsed in the rinsing tank, the two rotating bearings on the rotating shaft are respectively placed on the two bearing seats to ensure the position of the drum and the rinsing pool are unchanged, and the resistance when the drum is rotated is reduced.

Preferably, the unloading unit is a lower hopper, and when the drum is moved from the rinsing tank to the directly above the hopper unit by the hoisting device, the material inlet and outlet position is adjusted downward by rotating the handle on the drum, and then the drum cover is opened to make the material fall. Into the hopper, complete the cutting.

Preferably, the spray unit comprises a water pressurizer, a water nozzle, a spray conveyor belt and a spray shield, the water nozzle and the water pressurizer are disposed on one side of the spray conveyor belt, and the water nozzle is connected with the water pressurizer The magnesium alloy scrap is again washed in the spray unit through the water nozzle. The spray shield is a three-sided protective cover and is disposed on both sides and above the spray conveyor belt to avoid the transportation of the magnesium alloy scrap on the spray conveyor belt. The water nozzle drops when sprayed, reducing waste and avoiding splashing of spray water.

More preferably, the spray conveyor belt is a vibrating conveyor belt plate. As a preferred embodiment, the conveyor belt plate is electrically connected to a vibration motor and has a porous structure and is sloped to achieve vibration. During the process, the material is evenly moved on the vibrating plate, avoiding the problem that the spray conveyor belt will pile up the materials together. As a still further preferred mode, the belt plate has a slope of 5 to 30 degrees. The sprinkler belt is equipped with baffles on both sides to prevent material from falling.

More preferably, the blanking unit is disposed at one end of the shower unit, preferably at one end of the spray conveyor belt, and the magnesium alloy scrap is transported from the lower hopper and transported through the spray conveyor belt, and enters the spray unit for a second time. Washed.

More preferably, the shower unit further includes a collecting tube, one end of the collecting tube is disposed under the spray conveyor belt, and the other end is connected to the rinsing tank of the rinsing unit, and the collecting tube collects the wastewater generated by the spraying process through the collecting tube It is recycled as an aqueous solution in the rinsing tank.

Preferably, the pickling line further comprises a dehydration drying device for dehydrating and drying the acid-washed and water-washed material; the dehydration drying device comprises a connected but not connected wind-cutting unit and a hot air drying unit; The cutting unit is connected with the spray unit of the water washing area, and the magnesium alloy waste is dehydrated and dried by the wind cutting unit and the hot air drying unit through the spray unit, so that the liquid on the surface of the magnesium alloy waste is accelerated to evaporate, and the magnesium alloy waste is ensured in the subsequent process. Safety in the reduction of oxidation of magnesium alloy scrap and gas inclusion after melting.

More preferably, the wind cutting unit comprises a wind cut air compressor, a wind cut conveyor belt, a wind cut nozzle and a wind cut shield, wherein: the wind cut shield is a three-sided shield and is disposed on both sides and above the wind cut conveyor; The air-cutting nozzle is installed in the wind-cut protective cover above the wind-cut conveyor belt; one end of the wind-cut conveyor belt is connected with the shower unit of the water washing zone, and the other end is connected with the hot air drying unit; the air-cutting air compressor is provided for the wind-cutting nozzle Pressurized air; in the wind-cut unit, the magnesium alloy scrap conveys the compressed air sprayed through the air-cut nozzle through the wind-cut conveyor belt, and the liquid on the surface of the magnesium alloy scrap can be initially removed to reduce the working pressure of the hot air drying process.

More preferably, the hot air drying unit comprises a hot air air compressor, a heat source, a hot air nozzle, a heat drying conveyor belt and a heat drying shield, wherein: the heat drying shield is disposed on both sides of the heat drying belt and on the upper side of the heat drying belt The hot air air compressor is connected with the heat source, the hot air nozzle is disposed above the heat drying conveyor belt and is in the heat drying shield, and one end of the heat drying conveyor belt is connected with the wind cut conveyor belt of the wind cutting unit; the work of the hot air drying unit The principle is as follows: the pressurized air generated by the hot air compressor is heated to the pressurized hot air by the heat source, and the hot air air compressor generates the heated air to be sprayed into the hot air nozzle, and the magnesium alloy scrap is sprayed through the hot air nozzle in the hot drying conveyor. Pressurized hot air is dried to quickly evaporate the liquid on the surface of the magnesium alloy scrap. Among them, the heat source is a common heat source in the field, such as electric heating or gas heating, which is subject to energy conservation and environmental protection.

More preferably, the hot air drying unit further includes an air extractor disposed on one side of the heat drying conveyor belt to rapidly discharge the gas generated by evaporation of the surface of the evaporated magnesium alloy scrap to avoid gas condensation and secondary pollution.

In order to maintain the acid concentration of the magnesium alloy scrap in the pickling process to maintain a predetermined range and maintain the pickling effect of the magnesium alloy scrap, the inventor added an automatic supplement on the basis of the pickling production line of any of the above-mentioned structural magnesium alloy scraps. The acid exchange system, so as to monitor the acid change during the pickling process, automatically acid and acid exchange, maintain the acid concentration in a predetermined range, so that the pickling strength of the magnesium alloy waste remains unchanged, and the pickling effect is ensured; accordingly, The automatic acid-repairing system includes a pH tester, a Mg ²⁺ concentration detector, an electric control valve, an acid dosing pump, a water metering pump, and a control unit, wherein: a pH tester, a Mg ²⁺ concentration detector, and an electric control The valve part is set in the pickling tank, the acid metering pump, the water metering pump and the control unit are partially disposed outside the pickling tank; the pH value meter, the Mg ²⁺ concentration meter, the electric control valve, the acid metering pump and the water metering pump are The control unit data connections are preferably connected in parallel with each other. The pH tester is used to periodically test the acidity of the acid solution in the pickling tank. The Mg ²⁺ concentration detector is used to detect the Mg ²⁺ concentration in the pickling tank in real time, the pH tester and the Mg. ^{The 2+} concentration detector transmits the measured signal to the control unit, and controls the operation of the electric control valve, the acid quantitative pump and the water quantitative pump through the control unit; the electric control valve controls the acid out of the acid passage, and the acid quantitative pump controls the acid The acidity of the channel.

More preferably, when the pH value tested by the pH tester is lower than the set pH range, the control unit controls the acid dosing pump to open after receiving the signal, and the acid passage opens to replenish the acid pickling tank.

More preferably, when the detected value of the Mg ²⁺ concentration detector exceeds the set Mg ²⁺ concentration range, the control unit controls the electric control valve to open after receiving the signal, and the acid outlet channel is opened, and the acid is automatically discharged. After the acid is discharged, The electric control valve is closed, and the control unit simultaneously controls the acid metering pump and the water metering pump to be turned on, and the acid solution is reconfigured according to the set ratio.

As a further preferred embodiment, the above pH range is from 0 to 7, and the Mg ²⁺ concentration ranges from 0.0 to 3.0 mol/L.

In order to remove the impurities and coating on the surface of the magnesium alloy scrap as much as possible and reduce the impurity content in the magnesium alloy scrap, the inventors in the above-mentioned structure of the production line, the high-pressure cleaning device, the pickling zone, and the water washing in the pretreatment system The structure and the dehydration drying zone have been structurally improved to adapt the pickling zone and the water washing zone to the feeding device. The magnesium alloy waste is subjected to water washing before and after pickling, and the impurities attached to the magnesium alloy scrap are removed as much as possible, and the magnesium alloy after cleaning is removed. The waste is dried to accelerate the evaporation of the liquid on the surface of the magnesium alloy scrap, reduce gas inclusions, ensure the safety of the magnesium alloy scrap in the subsequent process, and improve the utilization rate of the magnesium alloy scrap.

In order to better remove the impurities and coating on the surface of the magnesium alloy scrap, it is difficult to pass the pickling treatment of a large amount of oil, mud and a stubborn oxide layer mixed with the above materials, and the structure of the magnesium alloy scrap is complicated and diverse. In particular, it removes oil stains and mud scales in a large number of groove structures; in order to improve the cleaning effect of the magnesium alloy scrap, reduce the impurity content in the magnesium alloy scrap, shorten the pickling time, and improve the pickling effect; the inventors in any of the above structures On the basis of the production line, the inventor pioneered the use of a high-pressure cleaning device in the pretreatment system as the initial washing equipment before the pickling of the magnesium alloy waste, so that the magnesium alloy scrap was washed with water before and after pickling, and the magnesium alloy scrap was removed as much as possible. Impurities, at the same time dry the magnesium alloy scrap after cleaning, so that the liquid on the surface of the magnesium alloy scrap accelerates evaporation, reduces gas inclusions, ensures the safety of magnesium alloy scrap in the subsequent process, and improves the utilization rate of magnesium alloy scrap. As a preferred embodiment, the high-pressure cleaning device comprises a self-rotating porous solid material device and a high-pressure cleaning machine; wherein the magnesium alloy waste material is built in the solid material device, and can be fixed in the solid material according to the self-rotation of the solid material device. Rotating motion inside the device, the high-pressure water generated by the cleaning nozzle of the high-pressure cleaner uniformly impacts the waste material to remove harmful impurities on the surface of the waste; the rotating rolling of the magnesium alloy scrap ensures that all magnesium alloy scraps in the solid-state device are cleaned and washed equally. In order to ensure the uniformity of cleaning; in addition, the porous structure of the solid material device can discharge the high-pressure washing water in time. The solid material device is preferably cylindrical. The cleaning nozzle of the high-pressure cleaner is preferably built in the solid-state device and evenly distributed along the central axis of the solid-state device to ensure uniformity of cleaning. It should be noted that the specific structure of the high-pressure cleaning device disclosed in the present invention is not the key to the implementation of the present invention, wherein the cleaning pressure required by the present invention can be achieved, and the high-pressure cleaning device can ensure the cleaning effect. It is preferable to balance energy conservation and environmental protection on the basis; any structural improvement for the high pressure cleaning device in the production line should be regarded as an improvement by those skilled in the art under the suggestion of the present invention.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, in order to remove obvious impurities such as screws, rubber and other non-magnesium alloy scraps in the magnesium alloy scrap, and to reduce the magnesium alloy ingot formed by the magnesium alloy scrap. The content of impurities makes the magnesium alloy ingot meet the requirements of national standards. On the basis of any of the above-mentioned structural production lines, the inventors added a sorting device in the pretreatment system to remove the impurities of the non-magnesium alloy scrap in the magnesium alloy scrap and improve the magnesium alloy scrap. The amount of medium-magnesium alloy reduces the impurity content of the magnesium alloy ingot formed by the magnesium alloy scrap, so that the magnesium alloy ingot meets the requirements of national standards.

Preferably, the sorting device comprises a first sorting unit and a second sorting unit, the first sorting unit is disposed in front of the high pressure washing device, and the second sorting unit is connected to the dehydration drying zone and disposed in the dehydration drying zone, the magnesium alloy When the waste enters the pretreatment system, it is first sorted by the first sorting unit, and then passes through the high pressure washing zone, the pickling zone, the water washing zone, the dehydration drying zone, and then enters the second sorting unit for the second time. The selection ensures that the impurities of the non-magnesium alloy scrap in the magnesium alloy scrap are removed, and the harmful elements in the magnesium alloy product are prevented from exceeding the standard, which affects the performance of the material.

Preferably, the first sorting unit is a sorting platform, and the sorting platform is a manual sorting platform.

More preferably, the height of the sorting platform is 1000-1200 mm and the width is 800-1200 mm for convenient manual operation.

More preferably, the sorting platform is stationary. As a further preferred embodiment, the sorting platform is a driveable conveyor belt.

Preferably, the second sorting unit is located at the tail of the dewatering and drying conveyor belt, and the magnesium alloy scrap containing the non-magnesium alloy scrap is manually removed on the sorting conveyor.

More preferably, the second sorting unit transport belt is the same transport belt as the drying transport belt.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, in order to further remove water vapor in the magnesium alloy scrap, avoid explosion caused by water vapor, and shorten the melt refining time of the subsequent magnesium alloy scrap, and invent Production of any of the above structures On the basis of the line, a preheating system is added, and the preheating system is disposed between the pretreatment system and the melt refining system to further remove the water vapor from the magnesium alloy scrap processed by the pretreatment system, thereby avoiding the explosion caused by the water vapor and shortening The subsequent melt refining time of the magnesium alloy scrap.

Preferably, the preheating system comprises a drying box, a holding container and a preheating air extracting device, wherein the holding container is movably installed in the drying box, the preheating air extracting device is installed in the drying box, and the magnesium alloy scrap is placed through the holding container. In the dry box, the preheating air suction device draws out the water vapor in the drying box to keep the dry environment inside the drying box.

More preferably, the container is placed in a dry box in a drawer type.

More preferably, the pulley is mounted on the container to facilitate the entry and exit of the container into and out of the drying box.

More preferably, the holding container is made of mesh low carbon steel plate for facilitating the discharge of moisture generated by heat conduction and evaporation. More preferably, the mesh

The diameter is less than the maximum dimension of the smallest block diameter of the magnesium alloy scrap.

More preferably, the mesh has a diameter of 5 to 10 mm.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, in order to completely melt the magnesium alloy scrap processed by the pretreatment system during the refining process, while preventing adsorption of impurities in the melting process, the inventor On the basis of any of the above-mentioned structural production lines, structural improvement is made to the melt refining system, so that the magnesium alloy scrap processed by the pretreatment system is completely melted in the melt refining system, the melting efficiency of the magnesium alloy is improved, and the purity of the magnesium alloy is maintained, correspondingly The molten refining system comprises a refining unit, a slag unit and a liquid transfer unit. The slag unit can be built in the refining unit, the refining unit is connected with the liquid transfer unit, and the magnesium alloy liquid is transferred to the liquid refining unit after the melting and refining is completed. Into the pouring system.

Preferably, the refining unit is a natural gas regenerative melting furnace, wherein the melting furnace is further provided with a stirring device and a deaerator device, the stirring device is used for stirring the molten liquid in the melting furnace, and the degassing device is used for reducing the magnesium alloy liquid ( Gas content in the melt).

More preferably, the melting furnace comprises a magnesia crucible, a melting furnace body, a heating device and a heating control device, the magnesia crucible is placed on the melting furnace body, the heating device is heated by the magnesia crucible, and the heating control device controls the heating device to heat.

More preferably, the magnesia crucible is made of a composite steel plate, the inner liner is a nickel-free steel plate, and the outer layer is a SUS310S stainless steel plate.

More preferably, the heating device uses natural gas as a fuel to heat the molten magnesia, and through the regenerative heat exchange combustion technology, the heat utilization rate is high, the energy consumption is relatively low, and resources are saved.

More preferably, the degassing device uses argon gas to spray the magnesium alloy liquid (melt) in the molten magnesium to greatly reduce the gas content in the magnesium alloy liquid (melt), and the magnesium alloy liquid (melt) twice. Refining reduces the amount of solid impurities in the magnesium alloy fluid (melt).

More preferably, the degassing device comprises an argon gas spray gun, a compressed air drying filter, a bottled argon gas and a pressure controller, an argon gas spray gun, a bottled argon gas and a pressure controller connected to the compressed air drying filter, and the pressure controller controls the compression. The air drying filter, the argon gas in the bottled argon gas is dried by the compressed air drying filter and supplied to the argon gas spray gun, so as to ensure the dryness of the argon gas, prevent the water vapor from entering the magnesium alloy liquid (melt), and avoid the magnesium caused by the water vapor. Alloy liquid (melt) splash and secondary gas inclusions.

More preferably, the magnesium alloy liquid (melt) in the smelting furnace is processed by the refining unit, and then the magnesium slag in the magnesium alloy liquid (melt) is removed by the slag removing unit, and the slag removing unit comprises a slag bag and a gas blowing device. The slag bag is preheated and then submerged into the fused magnesia in the smelting furnace, and the gas blowing device blows the magnesium slag into the slag bag from the bottom of the fused magnesia to remove the magnesium alloy solution (melt). Magnesium slag improves the purity of the magnesium alloy in the magnesium alloy fluid (melt).

More preferably, the gas blown in the gas injection device is an inert gas to prevent oxidation of the magnesium alloy liquid (melt).

Preferably, the magnesium alloy liquid (melt) processed by the smelting furnace, the refining unit and the slag removing unit is transferred to the casting system through the liquid transferring unit to form a magnesium alloy ingot, and the liquid transferring unit comprises a casting pump and an inlet pipe. The liquid outlet pipe and the liquid transfer drive motor, the inlet pipe and the outlet pipe are connected with the casting pump, the liquid transfer drive motor controls the rotation speed of the casting pump, and the inlet pipe draws the magnesium alloy liquid (melt) into the casting pump, and then It is transported through the outlet pipe to the gating system.

More preferably, the liquid transfer drive motor is a variable frequency speed control motor.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, in order to ensure that the magnesium alloy liquid (melt) obtained by the melt refining system remains in a liquid state, and is transferred from the melt refining system to the gating system. The coagulation phenomenon does not occur in the middle. On the basis of the production line of any of the above structures, the inventor has added an insulation system which is disposed between the melt refining system and the gating system, and through the thermal insulation system to the magnesium alloy solution of the melt refining system ( The melt is kept in a state of keeping the magnesium alloy liquid (melt) in a liquid state, and is kept warm for a long period of time, thereby further improving the purity of the melt and also facilitating temperature control; in addition, ensuring smooth production of the plurality of molten magnesium furnaces Correspondingly, the heat preservation system includes a holding furnace and a gas protection unit, and the gas protection unit is disposed on the holding furnace, and a dry inert gas is introduced into the holding furnace through the gas protection unit to prevent the magnesium alloy liquid (melt). It is oxidized in the holding furnace. More preferably, the holding furnace comprises a heat preservation furnace, a heat preservation furnace body, a heat preservation heating device and a heat preservation control device, the heat preservation concrete is disposed on the heat preservation furnace body, the heat preservation heating device is disposed in the heat preservation furnace body, and the heat insulation heating device is connected with the heat preservation control device, The heat preservation control device controls the heating temperature of the heat retention heating device.

More preferably, the heat preservation crucible is provided with a partition plate, and the partition plate divides the heat preservation crucible into 2 to 3 sub-chambers, and the partition plate is made of a nickel-free steel sheet.

More preferably, the partition plate is provided with at least one liquid flow hole, preferably 1 to 3 liquid flow holes, and the distance of the liquid flow hole from the bottom of the heat preservation crucible is 200-500 mm, and the magnesium alloy liquid is effectively intercepted through the liquid flow hole (melting The bottom slag and scale in the body enter the casting system to ensure the purity of the magnesium alloy fluid (melt) used in the casting system.

More preferably, the insulating enamel is made of a composite steel plate, the inner lining is a nickel-free steel plate, and the outer layer is a SUS310S stainless steel plate.

More preferably, the heat preservation heating device adopts a spiral high-resistance chrome-aluminum alloy electric resistance wire as a heating element, and the electric resistance wire is embedded in the heat preservation In the furnace body.

More preferably, the electrical resistance wires respectively correspond to the compartments in the thermal insulation 安装 during installation.

More preferably, the electric resistance wires in each sub-chamber of the thermal insulation crucible are relatively independent, so that the heating regions corresponding to the respective sub-chambers in the thermal insulation crucible are independently formed into zones, and each zone can independently adjust the heating temperature through the heat preservation control device, thereby realizing the indoor compartments in the thermal insulation crucible. The magnesium alloy liquid (melt) is heated separately to make the heat dissipation distribution of each compartment more reasonable.

As a preferred embodiment, each holding furnace is combined with a smelting furnace in three to four melt refining systems.

More preferably, the distance between the holding furnace and the melting furnace is not more than 1 m.

More preferably, the gas protection unit comprises an air inlet, an exhaust port and a gas protection device, the air inlet and the exhaust port are arranged on the heat preservation raft, the gas protection device comprises a bottled inert gas, a pressure controller and an introduction pipe, and the pressure control The device is arranged on the inlet pipe, the pressure controller controls the output flow rate of the bottled inert gas to the gas, and the introduction pipe connects the bottle of the inert gas and the gas inlet, so that when the magnesium alloy liquid (melt) is contained in the heat preservation crucible, it is not in the heat preservation crucible. The inert gas is intermittently covered to cover the surface of the magnesium alloy liquid (melt) to prevent the magnesium alloy liquid (melt) from coming into contact with oxygen to prevent oxidation.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, which is to continuously cast a magnesium alloy liquid (melt) into a magnesium alloy ingot, improve the production efficiency of the magnesium alloy ingot, and improve the magnesium alloy liquid ( The utilization rate of the melt) and the resource conservation, the inventors have improved the casting system on the basis of the production line of any of the above structures, and rapidly cast the magnesium alloy liquid (melt) processed by the melt refining system into a magnesium alloy. Ingots, avoid impurity pollution, improve production efficiency, improve the utilization rate of magnesium alloy liquid (melt), and save resources.

Preferably, the casting system comprises an ingot unit, a dosing pump and a casting control unit, the magnesium alloy liquid (melt) is injected into the ingot unit via a dosing pump, and the pouring control unit is connected to the ingot unit and the dosing pump.

More preferably, the ingot unit comprises an ingot casting machine, an ingot mold and a conveying crawler, and the ingot casting machine is divided into a casting zone, a spindle cooling zone, a blanking zone, an ingot die cooling zone, a preheating zone and a coating spraying zone, and the ingot The mold is mounted on the conveying track through the pouring zone, the spindle cooling zone, the blanking zone, the ingot cooling zone, the preheating zone and the coating spraying zone, and the quantitative pouring pump casts the magnesium alloy liquid (melt) in the pouring zone. In the ingot mold.

More preferably, the transmission track is controlled by a variable frequency speed regulating motor and a shaft mounted speed reducer, and the ingot mold is controlled by the frequency conversion speed regulating motor and the shaft mounted speed reducer on the conveying track, and sequentially passes through the pouring zone, the spindle cooling zone, and the lower Material zone, ingot mold cooling zone, preheating zone and coating spray zone.

More preferably, the casting zone is a semi-closed zone in which the magnesium alloy fluid (melt) of the casting process is protected with an inert gas.

More preferably, the spindle cooling zone uses air as a cooling medium to cool the cast spindle.

More preferably, the ingot cooling zone uses water as a cooling medium to cool the blanked ingot mold.

More preferably, the preheating zone uses natural gas or gas combustion as a preheating heat source.

More preferably, in the ingot casting machine, except for the pouring zone, the blanking zone, the ingot die cooling zone and the coating spraying zone, all other zones are closed areas, and the closed zone is provided with a dust collecting hood.

More preferably, the quantitative pouring pump is connected to the pouring control unit, and the quantitative pouring pump comprises a pouring port and a conductive probe corresponding to the pouring area of the ingot casting machine, and the two poles of the conductive probe are respectively combined with the ingot mold and the quantitative pouring pump The end is electrically connected.

More preferably, the probe is tangent to the set magnesium alloy liquid height position. When the magnesium alloy liquid reaches the set height, the probe contacts the magnesium liquid to form a short circuit, and the pouring control unit receives the short circuit signal and controls the quantitative pouring pump to stop pouring.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap, and to inspect the surface quality of the semi-finished product of the national standard magnesium alloy ingot formed by the casting system, the inventor is based on the production line of any of the above structures. The post-processing system is added. After the pouring system is set up in the pouring system, the surface treatment of the semi-finished products of the national standard magnesium alloy ingot is processed by the post-processing system to obtain the finished product of the national standard magnesium alloy ingot.

Preferably, the post-processing system comprises a polishing machine, a printer and a baler, and the semi-finished product of the national standard magnesium alloy ingot formed by the pouring system is processed by the polishing machine, the ink jet printer and the baler in order to obtain the finished national standard magnesium alloy ingot.

More preferably, the polishing machine comprises a frame, a polished steel wire wheel, a polishing motor and a dust removing device, the polishing wire wheel is arranged on the frame, the polishing motor drives the polishing wire wheel to polish the semi-finished product of the national standard magnesium alloy ingot, and the dust removing device recovers the polishing process. Magnesium alloy and magnesium oxide waste.

More preferably, the dust removing device adopts a wet dust removing method to directly pass the magnesium alloy and the magnesium oxide waste into the liquid solvent.

More preferably, the dust removing device communicates with the dust collecting hood in the ingot casting machine to remove dust generated in the ingot casting machine.

More preferably, the printer is a laser printer, which is simple in operation and high in efficiency.

Another object of the present invention is to provide a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap. In order to reduce environmental pollution and save resources, and to make the entire production line safe and environmentally friendly, the inventor has increased the production line of any of the above structures. The environmental protection system processes waste gas, waste residue and waste acid in the entire production line through the environmental protection system, realizes zero discharge of waste gas, waste residue and waste acid in the entire production line, protects the environment and saves resources; accordingly, the environmental protection system includes an exhaust gas treatment unit, The waste residue and waste acid treatment unit are separately arranged, and the exhaust gas treatment unit, the waste residue and the waste acid treatment unit respectively process the exhaust gas, waste residue and waste acid generated in the entire pickling production line.

Preferably, the exhaust gas treatment unit is an acid gas spray tower for treating acid gas, the acid gas spray tower comprises a fan, a filler, a spray device, a defogging device, a spray liquid circulation pump and an absorption tower; Zero gas emission of acid gas after neutralization of the gas can achieve environmentally friendly treatment of the exhaust gas.

More preferably, the exhaust gas treatment unit further comprises a sealed glass chamber, the exhaust unit being disposed in the glass chamber, the exhaust unit discharging the acid gas in the glass chamber into the sour gas spray tower.

More preferably, the rinsing unit of the pickling zone and the water washing zone are disposed in the glass room to prevent acid gas from overflowing in the pickling zone and the rinsing unit. reduce environmental pollution.

More preferably, the glass room is provided with a feeding door, a discharging door and a control sensor, and the control sensor controls the switch of the feeding door and the discharging door. When the magnesium alloy scrap material enters the pickling line, the feeding door is automatically opened. After the end of the feeding, the material is automatically closed; when the magnesium alloy waste material is processed through the entire pickling line, the discharge door is automatically opened, and the discharging is automatically closed after the discharging is completed.

More preferably, the waste residue treatment unit is a magnesium slag recovery unit, including a recovery dissolution tank, a recovery filter, a recovery evaporation crystallizer, and a recovery calcination furnace, and the magnesium slag generated in the production line is sequentially recovered through a dissolution tank, a recovery filter, and recovered for evaporation. The crystallizer and the recovery calciner are processed to obtain high-purity magnesium oxide and mixed chlorine salts to protect the environment and save resources.

More preferably, the waste acid treatment unit comprises a neutralization tank, a filter, an evaporative crystallizer and a dryer which are sequentially connected, and the spent acid in the pickling zone is sequentially dried by a neutralization tank, a filter, an evaporative crystallizer and a dryer to obtain a dryness. Magnesium salt, thus achieving zero emissions of waste acid, protecting the environment and conserving resources. The neutralization tank is connected to the acid passage.

In combination with any of the above production lines, the production line includes a pretreatment system, a preheating system, a melt refining system, a heat preservation system, and a gating system, and the magnesium alloy scrap is cleaned and removed by the pretreatment system, and then preheated by the preheating system. After entering the melt refining system for refining and / or alloying into magnesium alloy liquid, and then maintaining the magnesium alloy liquid state by the thermal insulation system, and finally pouring into the national standard magnesium alloy ingot through the pouring system; in addition, the environmental protection system is used to process and recycle the "in the production line" Three wastes."

Compared with the prior art, the production line of the national standard magnesium alloy ingot based on magnesium alloy scrap provided by the invention has the following advantages:

1. This production line effectively realizes the industrialization of directly producing magnesium alloy ingots using magnesium alloy scrap as raw materials, greatly reducing the raw material cost of GB magnesium alloy ingot production, reducing environmental pollution, saving energy and prolonging the service life of magnesium alloy.

2. The cleaning process of magnesium alloy waste adopts three steps of initial washing, pickling and water washing, and the initial washing adopts high pressure washing, dynamic pickling during pickling, and washing with water washing by rinsing and spraying to ensure the removal of magnesium alloy. Impurities on the surface of the waste and residual acid, reducing the loss of magnesium alloy scrap;

3. The magnesium alloy scrap is packed in the drum during cleaning. The magnesium alloy scrap is closed in the drum relative to the outside waste. All the magnesium alloy scraps in the drum have the same chance of contact with the acid and water during the rotation process, thus ensuring uniform pickling and washing. Sexuality, shorten the overall cleaning time, reduce the loss of magnesium alloy scrap, and improve the utilization rate of magnesium alloy scrap;

4. The cleaned magnesium alloy scrap is dried several times, and air drying, hot air drying and preheating drying are adopted to accelerate the liquid evaporation of the surface of the magnesium alloy scrap after washing, to ensure the safety of the magnesium alloy scrap in the subsequent process, and to reduce the gas. Inclusion, improve the utilization rate of magnesium alloy scrap;

5. The acid pickling process increases the automatic acid-repairing acid-changing device, and the timing monitoring ensures that the acid pH value and the Mg ²⁺ concentration are maintained within a predetermined range, and the acid is automatically acid-changed according to the change to ensure the pickling effect;

6. The casting pump is used to transfer the magnesium alloy liquid from the melt refining system to the thermal insulation system, which saves the preheating process and avoids the pipeline blockage caused by poor preheating and the safety hazard of the pump body or pipeline explosion;

7. The magnesium alloy liquid in the melt refining system is insulated by the heat preservation system to further purify and accurately control the magnesium alloy liquid, and the heat preservation furnace of the heat preservation system adopts the partition independent heating mode to realize the temperature rise of the magnesium alloy liquid in the separate compartment. The heat dissipation distribution is more reasonable during the heating process;

8. Improve the structure of the pouring system so that the entire casting process is continuous, improve the production efficiency, and prevent the oxidation of the magnesium alloy liquid while pouring;

9. Polishing the magnesium alloy ingot formed after casting, improving the surface quality of the magnesium alloy ingot and meeting the national standard magnesium alloy ingot standard;

10. Add an environmental protection system to the whole pickling production line, and treat the waste gas, magnesium slag and waste acid generated in the pickling production line through the environmental protection system to achieve zero discharge of waste gas, magnesium slag and waste acid, protect the environment and save resources;

In summary, the present invention provides a production line of a magnesium alloy ingot based on the production of a magnesium alloy scrap, and the magnesium alloy scrap is processed through a pretreatment system, a preheating system, a melt refining system, a thermal insulation system, a pouring system, and a post-treatment system. The coating layer and impurities on the surface of magnesium alloy scrap are processed into magnesium alloy ingots in line with national standards. The exhaust gas, magnesium slag and waste acid generated in the entire production line are treated by an environmental protection system to achieve zero emission of waste gas, magnesium slag and waste acid. Protecting the environment while conserving resources; the system and equipment are connected smoothly, with high automation, simple operation and high production efficiency. For the first time, 100% of the production of GB magnesium alloy ingots is directly produced from scrap magnesium alloy products. Therefore, its application prospects Very broad.

DRAWINGS

1 is a schematic view showing a preferred embodiment of a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

2 is a schematic view showing a preferred embodiment of a high-pressure cleaning device in a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

3 is a schematic view of a feeding device in a pretreatment system in a production line of a magnesium alloy ingot produced by a magnesium alloy scrap according to the present invention;

4 is a schematic view showing a water washing zone in a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

5 is a flow chart of an automatic acid-repairing and acid-removing device in a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

6 is a flow chart of a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

7 is a flow chart of a preheating system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

8 is a flow chart of a melt refining system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

9 is a flow chart of an insulation system for a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap provided by the present invention;

10 is a flow chart of a pouring system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention;

Figure 11 is a flow chart of a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap provided by the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings.

The models of the devices or components not described in detail in the following embodiments may be commercially available in the prior art, and only need to satisfy the functions of the devices in the production line of the magnesium alloy ingots produced by the magnesium alloy scrap provided by the present invention. It is not intended to be a limiting choice of the invention; and it is operated or used according to the specification or the corresponding standard.

1 to FIG. 11 are schematic diagrams showing a preferred embodiment of a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention. The magnesium alloy scrap can be directly processed into a national standard magnesium alloy ingot through the production line, and 100% of the magnesium alloy scrap is realized. The industrialization of the national standard magnesium ingots is directly produced for raw materials. The production line comprises a pretreatment system 1, a preheating system 2, a melt refining system 3, a thermal insulation system 4 and a pouring system 5, and the magnesium alloy waste passes through a pretreatment system 1, a preheating system 2, a melt refining system 3, an insulation system 4, and The gating system 5 processes the national standard magnesium alloy ingot.

As shown in Figures 2 to 6, this is a preferred embodiment of the pretreatment system 1 in the production line. The magnesium alloy scrap removes surface coating and impurities in the pretreatment system 1. The pretreatment system 1 includes a high pressure cleaning device 10 and a pickling line, which can be processed after the magnesium alloy scrap is processed by the high pressure cleaning device 10 and the pickling line. It is used directly as a raw material for magnesium alloy national standard ingots.

2 is a schematic view of a preferred embodiment of a high-pressure cleaning device in a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention; as shown in FIG. 2, the high-pressure cleaning device 10 includes a a rotating porous solid material device 101 and a high pressure washing machine (not shown); wherein the magnesium alloy waste a is built into the solid material device 101, and can rotate in the solid material device 101 according to the self-rotation of the solid material device 101. The cleaning nozzle 102 of the high-pressure cleaner uniformly impacts the generated high-pressure water to remove the harmful impurities on the surface of the waste material; the rotary rolling of the magnesium alloy scrap ensures that all the magnesium alloy scraps in the solid-state device are equalized in cleaning and flushing, thereby ensuring cleaning. In addition, the porous structure of the solid material device 101 can discharge the high-pressure washing water in time. The solid material device 101 has a cylindrical shape. The cleaning nozzle 102 of the high-pressure cleaner is built in the solid-state device and evenly distributed along the central axis direction of the solid-state device 101 to ensure uniformity of cleaning. The rotation shaft 1011 of the solid-state device 101 is hollow, and the water pipe 103 of the high-pressure cleaner can pass through here to realize that the nozzle 102 is built in the solid-state device 101 to achieve an optimal cleaning effect. In addition, for sufficient recycling, a waste water recovery tank may be disposed under the solid material device 101 for recovering waste water generated by high pressure cleaning.

3 is a schematic diagram of a pickling line in a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention; as shown in FIG. 3, the pickling line includes a holding device 11, a pickling zone 12, and a water washing zone. 13. The hoisting device 14, the automatic acid-refueling system 15 and the dehydration drying device 16, the pickling zone 12 and the water washing zone 13 are separately provided, the holding device 11 is filled with magnesium alloy scrap, and the hoisting device 14 realizes the pickling device 11 in pickling The movement between the zone 12 and the water washing zone 13, the dehydration drying device 16 dries the magnesium alloy waste treated by the pickling zone 12 and the water washing zone 13, and the automatic acid-refueling system 15 maintains the acid concentration in the pickling zone 12. The magnesium alloy waste is sequentially processed by the high-pressure cleaning device 10, the pickling zone 12, the water washing zone 13, and the dehydration drying device 16, to obtain a dry and clean magnesium alloy scrap, which can be directly used for the production of the national standard magnesium alloy ingot.

The material flow of the magnesium alloy waste is as follows: after the magnesium alloy waste is put into the feeding device 11, the feeding device 11 driven by the lifting device 14 sequentially enters the pickling zone 12 and the washing zone 13 for pickling and washing, and then dehydrated. The drying device 16 is dehydrated and dried. The hoisting device 14 controls the movement of the sumping device 11, the slinging device 14 moves the sumping device 11 between the pickling zone 12 and the water washing zone 13, and the magnesium alloy waste passes through the sumping device 11 in the pickling zone 12 and the water washing zone 13. Pickling and water washing were performed separately from the rotation. The magnesium alloy waste is sealed in the holding device 11 with respect to the external waste, and the washing liquid of the pickling zone 12 and the washing zone 13 is brought into contact with the magnesium alloy scrap in the holding device 11 through the feeding device 11.

3 is a schematic view of a feeding device in a pickling production line of magnesium alloy waste provided by the present invention. As shown in FIG. 2, the loading device 11 includes a drum 111 and a driving motor 112. The drum 111 is filled with magnesium alloy scrap and is provided with a rotating shaft 116. The rotating shaft 115 penetrates the drum 111 and is fixedly connected with the drum 111, preferably welded. The driving motor 112 is disposed. At one end of the pickling zone 12, the driving motor 112 rotates by rotating the driving drum 111 by driving the rotating shaft 116. At this time, the magnesium alloy scrap in the drum 111 is sufficiently pickled and washed in the pickling zone 12 and the washing zone 13, and the drum 111 is inside. The magnesium alloy scrap is turned under the driving of the drum 111 to ensure that the magnesium alloy scrap is in full contact with the cleaning liquid, and the impurities on the surface of the magnesium alloy scrap (especially in the groove) are more likely to fall off during the turning process, thereby maintaining the consistency of cleaning. And improve cleaning efficiency.

The drum 111 is a cylinder or a regular polygonal cylinder and is welded by a titanium alloy plate, an engineering plastic plate or other acid-resistant high-strength plate. The roller 111 is provided with a plurality of through holes 112. The through holes 112 are distributed on the wall of the drum 111. The diameter of the through holes 112 is smaller than the block diameter of the smallest block of the magnesium alloy scrap, and the through hole 112 has a hole diameter of 5 to 30 mm to prevent magnesium. The alloy scrap is detached from the through hole 112 during pickling and water washing, reducing the loss of the magnesium alloy scrap, and enabling the solution in the pickling zone 12 and the water washing zone 13 to pass from the through hole 112 into the drum 111 and the magnesium alloy scrap is sufficient. Contact ensures uniformity of magnesium alloy scrap during pickling and washing, and shortens overall pickling and washing time.

The drum 111 includes a material inlet and outlet 113 and a cover plate 114 through which the material inlet and outlet are opened and closed. The cover plate 114 is mounted on the drum wall outside the material inlet and outlet 113 by a hinge and is fitted to the material inlet and outlet 113. The magnesium alloy waste enters and exits the drum 111 through the material inlet and outlet 113. When feeding or discharging, the cover plate 114 is opened, and the material inlet and outlet 113 is in an open state. When the drum 111 is in the process of self-rotation, the cover plate 114 is closed, and the material inlet and outlet 113 is closed. status. The drum 111 further includes a handle 115 which is coaxial or parallel with the center line of the drum 111, is disposed outside the cylinder wall surface of the drum 111 and is fixedly connected with the drum 111, and can control the feeding of the feed by controlling the rotation of the drum 111 by rotating the handle 115. And in the direction of the material inlet and outlet 113 on the drum 111 at the time of discharging, it is ensured that the material inlet and outlet 113 faces upward when feeding, and the material inlet and outlet 113 faces downward when discharging.

The rotating shaft 116 is a solid cylindrical structure and is made of a titanium alloy or other acid-resistant metal and an alloy material thereof. When the hoisting device 14 transfers the loading device 11, the rotating shaft 116 is the main force-receiving member during the entire hoisting process. One end of the rotating shaft 116 is provided with a transmission gear 1111, and the driving motor 112 is provided with a pair of transmission motor gears 1121, which are meshed with the transmission motor gears 1121 through the transmission gears 1111, and the drive motor 112 drives the rotation shaft 116 to rotate, thereby rotating the drum 111.

At the same time, the two ends of the rotating shaft 116 are respectively provided with a rolling bearing 1112 and a lifting component 1113, wherein: the lifting component 1113 is movably connected with the lifting device 14, and in this embodiment, the lifting component 1113 is a bearing that is sleeved with the rotating shaft, and The diameter is not greater than the diameter of the hook of the hoisting device 14; the rolling bearing 1112 is used to reduce the resistance of the drum 111 when it is rotated. As shown in FIG. 2, the rotating shaft 116 is, in order from top to bottom, a transmission gear 1111, a lifting element 1113, a rolling bearing 1112, a cylinder of the drum 111, a rolling bearing 1112, and a lifting element 1113.

The hoisting device 14 adopts the driving structure in the prior art, and the structure adopted in the embodiment includes a hoisting motor, a hoisting controller and a hoisting unit, and the hoisting controller is a programmable logic controller, and the controller drives the hoisting by controlling the hoisting motor. The unit moves to move the loading device 11 in the pickling zone 12 and the water washing zone 13, and the lifting device 14 lifts the roller auxiliary roller 111 through the lifting elements 1113 at both ends of the rotating shaft 116 to sequentially complete the charging and pickling zones. The action of the pickling area, the water washing area, and the water washing area.

The magnesium alloy scrap is loaded into the drum 111 through the holding device 11, and then placed in the pickling zone 12 and the washing zone 13 by the lifting device 14 for pickling and water washing, in order to ensure that the magnesium alloy scrap is sufficiently washed and washed in the pickling and washing process. Upon contact, the inventors have made structural improvements to the pickling zone 12 and the water washing zone 13 on the basis of the pickling line of any of the above structures, so that the pickling zone 12 and the water washing zone 13 are adapted to the holding device 11, and the magnesium alloy scrap is During the pickling process, it is in full contact with the acid solution to remove the oxide layer and impurities on the surface of the magnesium alloy waste, and double-washing in the water washing process to completely remove the residual acid and residue on the surface of the magnesium alloy waste.

The magnesium alloy waste is pickled in the pickling zone 12 by the holding device 11. The pickling zone 12 includes a pickling tank 121, an acid passage 122 and an acid passage 123, and the acid passage 123 passes through the side wall of the pickling tank. The passage wall of the acid passage 123 is tangent to the bottom wall of the pickling tank, and the acid passage 122 penetrates the side wall of the pickling tank. The set height of the acid passage 122 is higher than the set height of the acid passage 123, and passes through the acid passage 122 and the outlet. The acid channel 123 controls the entry and discharge of the acid solution in the pickling tank 121. The acid passage 122 is a double acid passage, and the double acid passage is two branch pipes of the same main pipe. The two pipes are respectively disposed and penetrate different sidewalls of the pickling tank 121. Preferably, the two pipes are respectively disposed on opposite sides of the pickling tank 121. In this way, the acid solution in the pickling tank 121 can be more uniformly mixed during the acid feeding.

The pickling tank 121 is made of engineering plastics or glass steel. The pickling tank 121 has a pickling tank cover to form an entire pickling chamber. When not in use (when there is no feeding device), the acid solution in the pickling tank 121 volatilizes. Reduce raw material loss and reduce air pollution. The size of the pickling tank 121 is matched with the size of the drum 111, the length direction of the pickling tank 121 is 20-50 cm larger than the height dimension of the drum 111; the width direction dimension of the pickling tank 121 is 20-100 cm larger than the diameter of the drum 111; The height direction dimension of the pickling tank 121 is 10 to 100 cm larger than the radius of the drum 111.

A pickling bearing seat 1211 is disposed on both sides of the pickling tank 121. The two pickling bearing seats 1211 are installed at a position coaxial with the center line of the pickling tank 121. When the drum 111 is located in the pickling tank 121, the rotating shaft 116 is The two rotary bearings 1112 are respectively placed on the two pickling bearing seats 1211, thereby ensuring that the relative positions of the drum 111 and the pickling tank 121 are constant, while reducing the resistance when the drum 111 is rotated.

4 is a schematic view of a water washing zone in a pickling line of magnesium alloy waste provided by the present invention. After the drum 111 of the holding device 11 is pickled in the pickling tank 121 of the pickling zone 12, the lifting device 14 lifts the drum 111 through the two lifting elements 1113 on the rotating shaft 116, and moves the drum 111 to the water washing zone 13 for washing, such as As shown in FIG. 3, the water washing zone 13 includes a rinsing unit 131, a blanking unit 132, and a shower unit 133. The pickled magnesium alloy scrap passes through the rinsing unit 131, the blanking unit 132, and the shower unit 133 in the water washing zone 13 in sequence. The magnesium alloy waste is cleaned by the rinsing unit 131 and the shower unit 133, so that the pickled magnesium alloy waste is washed in the water washing zone 13 by rinsing and spraying, and the residual acid and residue on the surface of the magnesium alloy scrap are completely removed. .

When the drum 111 enters the water washing zone 13 from the pickling tank 121 via the hoisting device 14, the drum 111 first enters the rinsing unit 131, and the first washing of the magnesium alloy scrap is performed at the rinsing unit 131 to initially remove the residual acid and residue on the surface of the magnesium alloy scrap. . The rinsing unit 131 further includes a rinsing tank 1311 that spins the magnesium alloy scrap in a rinsing bath 1311. The size of the rinsing tank 1311 is matched with the size of the drum 111. The area of the rinsing tank 1311 is smaller than the area of the pickling tank 121 in the pickling zone 12, the area of the rinsing tank 1311 is larger than the horizontal cross-sectional area of the drum 111, and the depth of the rinsing tank 1311 is larger than The radius of the drum 111 facilitates rotation of the drum 111 within the rinsing tank 1311.

Both ends of the rinsing pool 1311 are provided with a rinsing bearing seat 13111. The mounting positions of the two rinsing bearing seats 13111 are coaxial with the center line of the rinsing pool 1311. When the drum 111 is rinsed in the rinsing pool 1311, the two rotating bearings 1112 on the rotating shaft 116 are arranged. When placed on the two rinsing bearing seats 13111, respectively, the relative position of the drum 111 and the rinsing tank 1311 is kept constant, and the resistance when the drum 111 is rotated is reduced.

After the magnesium alloy scrap is rinsed in the rinsing tank 1311 in the drum 111, the hoisting device 14 lifts the drum 111 through the two hoisting elements 1113 on the rotating shaft 116, and moves the drum 111 to the hopper unit 132, and the hopper unit 132 includes the lower hopper 1321. When the drum 111 is moved from the rinsing tank 1311 to the unloading unit 132 via the hoisting device 14, the drum 111 assists in pouring the magnesium alloy scrap from the drum 111 into the lower hopper 1321 via the hoisting device 14 to complete the blanking operation.

The shower unit 133 is connected to the blanking unit 132, and the magnesium alloy scrap is subjected to a second water washing in the shower unit 133 to remove the remaining residual acid and residue on the surface of the magnesium alloy scrap. The spray unit 133 includes a water pressurizer 1331. a water nozzle 1332, a spray conveyor belt 1333 and a spray shield 1334. The lower hopper 1321 is disposed at one end of the spray conveyor belt 1333. The magnesium alloy scrap is laid off from the lower hopper 1321 and then laid on the spray conveyor belt 1333. The water spray nozzle 1332 is transported by the spray conveyor belt 1333, the water nozzle 1332 is connected to the water pressurizer 1331, the magnesium alloy waste material is again washed by the water nozzle 1332 in the spray unit 133, and the water nozzle 1332 and the water pressurizer 1331 are disposed on the spray conveyor belt. On one side of 1333, the spray shield 1334 is a three-sided shield and is disposed on both sides and above the spray conveyor belt 1333 to prevent the magnesium alloy scrap from falling on the spray conveyor belt 1333 when sprayed through the water nozzle 1332, reducing waste. The spray conveyor belt 1333 is a vibrating conveyor belt plate. In the embodiment, the spray conveyor belt plate 1333 is electrically connected to a vibration motor, and has a porous structure and is sloped, which is convenient for the magnesium alloy waste in the water. The nozzle 1332 is seepage during the spraying process, and the vibration can be realized. During the process, the material is evenly moved on the vibrating plate, which avoids the problem that the spray conveyor belt will pile up the materials together; the slope of the spray conveyor belt plate 1333 is 10 degrees, and the baffles are provided on both sides to prevent the material from falling off. drop.

The shower unit 133 further includes a collecting tube 1335. One end of the collecting tube 1335 is disposed under the spray conveyor belt 1333, and the other end portion of the collecting tube 1335 is in communication with the rinsing tank 1311 of the rinsing unit 131. The collecting process is collected through the collecting tube 1335. The wastewater is used as an aqueous solution in the rinsing tank 1311, and the wastewater in the spraying process is recycled to save resources.

After the drum 111 in the receiving device 11 completes the blanking operation in the water washing zone 13, the drum 111 is lifted and moved to the initial stage by the lifting device 14, and the next round of loading, pickling, pickling, and rinsing are performed. Pool, rinsing tank and blanking operation.

In order to ensure the safety of magnesium alloy scrap in the subsequent process and reduce the scrap rate of magnesium alloy scrap reprocessing, the inventor added a dehydration drying device in the pickling line to accelerate the evaporation of the residual liquid on the surface of the magnesium alloy scrap to ensure the magnesium alloy. The safety of the waste in the subsequent process, reducing gas inclusions and reducing the scrap rate of magnesium alloy scrap reprocessing.

As shown in FIG. 1, the dehydration drying device 16 is disposed at the tail of the water washing zone 13, and the dehydration drying device 16 is connected to the tail of the shower conveyor 1333 of the shower unit 133 of the water washing zone 13, and the dehydrating drying device 16 includes a wind cutting unit 161. The hot air drying unit 162, the wind cutting unit 161 and the hot air drying unit 162 are connected together, the wind cutting unit 161 is connected to the shower unit 133 of the water washing area 13, and the magnesium alloy waste is washed by the shower unit 133 of the water washing area 13. The water-cutting unit 161 and the hot air drying unit 162 are dehydrated and dried in order to accelerate the evaporation of the liquid on the surface of the magnesium alloy scrap, thereby ensuring the safety of the magnesium alloy scrap in the subsequent process and reducing gas inclusions.

The wind cutting unit 161 can refer to the prior art, including a wind cut air compressor, a wind cut conveyor belt, a wind cut nozzle, and a wind cut shield, wherein: the wind cut shield is a three-sided shield and is disposed on both sides of the wind cut conveyor belt and Above; the air-cutting nozzle is installed in the wind-cut protective cover above the wind-cut conveyor; the air-cut conveyor belt is connected to the spray unit of the washing zone at one end, and the hot air drying unit is connected to the other end; the air-cutting air compressor is wind-cut The nozzle provides pressurized air; the magnesium alloy waste is transferred in the wind-cutting unit through the air-cut conveyor to transmit the compressed air sprayed through the air-cut nozzle, and the liquid on the surface of the magnesium alloy waste can be initially removed to reduce the work of the hot air drying process. pressure.

The hot air drying unit 162 also refers to the prior art, including a hot air air compressor, a heat source, a hot air nozzle, a heat drying conveyor belt and a heat drying shield, wherein: the heat drying shield is disposed on both sides of the heat drying belt for the three-sided shield And above, the hot air air compressor is connected with the heat source, the hot air nozzle is disposed above the heat drying conveyor belt and is in the heat drying shield, and one end of the heat drying conveyor belt is connected with the wind cut conveyor belt of the wind cutting unit; the hot air drying unit The working principle is as follows: the pressurized air generated by the hot air compressor is heated to the pressurized hot air by the heat source, and the hot air air compressor generates the heated air to be sprayed into the hot air nozzle, and the magnesium alloy scrap is transported through the hot air nozzle in the hot drying conveyor. The pressurized hot air is dried to quickly evaporate the liquid on the surface of the magnesium alloy waste. Among them, the heat source is a common heat source in the field, such as electric heating or gas heating, which is subject to energy conservation and environmental protection.

The hot air drying unit 162 further includes an air extractor disposed on one side of the heat drying conveyor belt to quickly discharge the gas generated by evaporation of the surface of the evaporated magnesium alloy scrap to avoid gas condensation and secondary pollution.

It should be noted that the wind-cut conveyor belt in the wind-cutting unit 161 and the hot-drying conveyor belt in the hot-air drying unit 162 are all mesh-shaped conveyor belts, facilitating the magnesium alloy scrap in the wind-cutting unit 161 and the hot-air drying unit 162. Breathing and water seepage during transportation, while the mesh of the mesh conveyor belt is smaller than the minimum block diameter of the magnesium alloy scrap.

FIG. 5 is a flow chart of an automatic acid-repairing and acid-removing system in a pickling line for magnesium alloy waste provided by the present invention. As shown in Fig. 5, in order to maintain the acid concentration of the magnesium alloy scrap in the acid washing process for a predetermined range, the pickling strength of the magnesium alloy scrap remains unchanged, and the pickling effect is ensured, and the inventor adds an automatic acid supplement in the pickling line. The acid exchange system 15 is used to monitor the acid change during the pickling process, automatically acid-replenishing the acid, and maintaining the acid concentration in a predetermined range to ensure the pickling effect.

As shown in FIG. 5, the automatic acid-refueling system 15 includes a pH tester 151, a Mg ²⁺ concentration detector 152, an electric control valve 153, an acid dosing pump 154, a water metering pump 155, and a control unit 156, wherein: pH The value tester 151, the Mg ²⁺ concentration detector 152 and the electric control valve 153 are partially disposed in the pickling tank 121, and the acid metering pump 154, the water metering pump 155 and the control unit 156 are partially disposed outside the pickling tank 121; The tester 151, the Mg ²⁺ concentration detector 152, the electric control valve 153, the acid dosing pump 154, and the water metering pump 155 are connected to the control unit 156 in data, in parallel with each other in this embodiment; accordingly, the electric control valve 153 The acid out of the acid passage 123 is controlled, the acid metering pump 154 controls the acid entering the acid passage 122, the pH tester 151, the Mg ²⁺ concentration detector 152, the electric control valve 153, the acid metering pump 154, and the water metering pump 155. Connected to the control unit 156, the pH tester 151 periodically tests the acidity of the acid solution in the pickling tank 121, and the Mg ²⁺ concentration detector 152 detects the Mg ²⁺ concentration in the pickling tank 121 in real time, the pH tester 151 and the Mg ^{2+ .} The concentration detector 152 transmits the measured signal to the control unit 156 via the control unit 15 6 Controls the operation of the electric control valve 153, the acid dosing pump 154, and the water metering pump 155.

When the pH value tested by the pH tester 151 is lower than the set pH range (>7), the control unit 156 controls the acid dosing pump 154 to open after receiving the signal, and the acid passage 122 opens to acid supplement the pickling tank 121. When the detected value of the Mg ²⁺ concentration detector 152 exceeds the set Mg ²⁺ concentration range, the control unit 156 controls the electric control valve 153 to open after receiving the signal, and the acid-out passage 123 is opened to perform automatic acid removal. The electric control valve 153 is closed, and the control unit 156 simultaneously controls the acid dosing pump 154 and the water dosing pump 155 to open, and reconfigures the acid solution according to the set ratio, so as to periodically detect the pH value and the Mg ²⁺ concentration in the pickling tank 121, and automatically fill up. The acid is changed for acid, and the acid concentration and the Mg ²⁺ concentration are maintained in a predetermined range to ensure the pickling effect.

The pretreatment system can remove impurities and coating on the surface of the magnesium alloy waste to the greatest extent, and reduce the impurity content in the magnesium alloy waste. The inventor firstly added the high pressure cleaning device 10 in the pretreatment system 1 and simultaneously the pickling zone 12 The water washing zone 13 and the dehydration drying device 16 are structurally modified to wash the magnesium alloy waste water before and after pickling, remove impurities attached to the magnesium alloy scrap as much as possible, reduce the impurity content in the magnesium alloy ingot, and simultaneously clean the magnesium alloy. The waste is dried to accelerate the evaporation of the liquid on the surface of the magnesium alloy scrap, reduce the gas inclusions, and ensure the magnesium alloy scrap in the follow-up Safety in the process to improve the utilization of magnesium alloy scrap.

In order to eliminate the obvious impurities in the magnesium alloy scrap such as screws, rubber and other non-magnesium alloy scraps, reduce the impurity content of the magnesium alloy ingot formed by the magnesium alloy scrap, ensure the purity of the magnesium alloy ingot, and make the magnesium alloy ingot meet the requirements of the national standard, the inventor On the basis of any of the above-mentioned structural production lines, a sorting device 17 is added to the pretreatment system 1, the impurities of the non-magnesium alloy scrap in the magnesium alloy scrap are removed, the amount of the magnesium alloy in the magnesium alloy scrap is increased, and the magnesium formed by the magnesium alloy scrap is reduced. The impurity content in the alloy ingot ensures the purity of the magnesium alloy ingot, so that the magnesium alloy ingot meets the requirements of national standards.

The sorting device 17 includes a first sorting unit 171 disposed before the high pressure washing zone 10 and a second sorting unit 172 disposed after the dehydrating drying device 16, the magnesium alloy scrap When entering the pretreatment system 1, first sorting is performed by the first sorting unit 171, and then sequentially passes through the high pressure washing zone 10, the pickling zone 12, the water washing zone 13, the dehydration drying device 16, and then enters the second sorting unit. 172 performs a second sorting to ensure that the impurities of the non-magnesium alloy scrap in the magnesium alloy scrap are removed and the amount of magnesium alloy in the magnesium alloy scrap is increased.

The first sorting unit 171 is a sorting platform, and the sorting platform is a manual sorting platform. In order to facilitate manual operation, the sorting platform is static, and the height of the sorting platform is 1000-1200 mm and the width is 800-1200 mm. The second sorting unit 172 comprises a sorting conveyor belt and a sorting drive motor. One end of the sorting conveyor belt is connected to the dehydration drying device 16, and the sorting drive motor drives the sorting belt to move, manually eliminating the inclusion on the sorting belt. Magnesium alloy scrap of non-magnesium alloy scrap. One end of the sorting conveyor belt is connected to one end of the thermal drying conveyor belt, and the position of the sorting conveyor belt is lower than the position of the heat-drying conveyor belt, ensuring that the magnesium alloy scrap enters the sorting conveyor belt after passing through the hot air drying unit 162.

FIG. 6 is a flow chart of a pretreatment system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention. As shown in FIG. 6, the magnesium alloy scrap is processed in the pretreatment system 1 by first sorting the magnesium alloy scrap through the first sorting unit 171 of the sorting device 17, and removing, for example, rubber or the like. Obviously non-magnesium alloy material; after passing through the first sorting unit 171, the magnesium alloy scrap is loaded into the loading device 11, and the lifting device 15 lifts the drum 111 through the two hooks 11113 on the central shaft 1111, and places the drum 111 into the high pressure washing zone. 12 self-rotating, high-pressure washing through the high-pressure cleaning zone 10, removing impurities on the surface of the magnesium alloy scrap; after the initial washing is completed, the lifting device 15 lifts the drum 111 through the two hooks 11113 on the central shaft 1111, and the auxiliary drum 111 completes the high-pressure cleaning. The zone is moved into the pickling zone, and the drum 111 is placed in the pickling tank 131 of the pickling zone 12 to rotate by itself, and is pickled by the acid in the pickling tank 131 to remove the surface coating of the magnesium alloy waste; after the pickling is completed The hoisting device 15 lifts the drum 111 through the two hooks 11113 on the central shaft 1111, drives the loading device 11 to complete the pickling zone, moves into the washing zone, and the drum 111 is placed in the rinsing unit 141 of the washing zone 13 to rotate. Rinsing unit 141 The water in the rinsing tank 1411 rinses the magnesium alloy waste to initially remove residual acid and residue adhering to the surface of the magnesium alloy scrap; after the rinsing is completed, the hoisting device 15 lifts the drum 111 through the two hooks 11113 on the central shaft 1111 to drive the material. The device 11 completes the rinsing unit, and the feeding unit operates. The magnesium alloy waste in the drum 111 is assisted by the lifting device 15 to be poured into the lowering funnel 1421 of the blanking unit 142; the magnesium alloy scrap from the lowering funnel 1421 is sprayed. The unit 143 is sprayed by the water nozzle 1432, and the impurities and the acid liquid on the surface of the magnesium alloy waste are removed again, and transported to the dehydration drying device 16 through the spray conveyor belt 1434. The magnesium alloy waste passes through the wind cut unit 161 in the dehydration drying device 16 in turn. The hot air drying unit 162 is dehydrated and dried; after drying, the dried magnesium alloy scrap is subjected to a second sorting of the magnesium alloy scrap through the second sorting unit 172 of the sorting device 17, and the impurities in the magnesium alloy scrap are again removed. The processing of the magnesium alloy scrap in the pretreatment system 1 is thus completed.

The preheating system 2 is disposed between the pretreatment system 1 and the melt refining system 3, further drying the magnesium alloy scrap processed by the pretreatment system 1, removing moisture in the magnesium alloy scrap, avoiding explosion caused by water vapor, and shortening The subsequent melt refining time of the magnesium alloy scrap. FIG. 7 is a flow chart of a preheating system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention. As shown in Fig. 7, the preheating system 2 includes a drying box 21, a holding container 22 and a preheating air extracting device 23, and the holding container 22 is movably mounted in the drying box 21, and the preheating air extracting device 23 is installed in the drying box. In the 21st, the magnesium alloy waste is placed in the drying box 21 through the holding container 22, and the preheating air extracting device 23 draws out the water vapor in the drying box 21 to maintain the dry environment in the drying box 21. The contents container 22 is placed in the drying box 21 in a drawer type, and a pulley is mounted on the holding container 22 to facilitate the feeding container 22 to enter and exit the drying box 21. The material container 22 is made of mesh low carbon steel plate, the diameter of the mesh is smaller than the maximum dimension of the smallest block diameter of the magnesium alloy scrap, and the diameter of the mesh is 5-10 mm, which facilitates the discharge of water vapor generated by heat conduction and evaporation.

The magnesium alloy waste is processed in the pretreatment system 1 and the preheating system 2 in this order, placed in the melt refining system 3, and converted into a magnesium alloy liquid (melt) by the melt refining system 3. In order to completely melt the pretreated magnesium alloy scrap during the refining process and prevent adsorption of impurities during the melting process, the inventors made structural improvements to the melt refining system 3 on the basis of any of the above-mentioned structural production lines, FIG. The invention provides a flow chart of a melt refining system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap. As shown in FIG. 8, the melt refining system 3 includes a refining unit 31, a slag unit 32, and a liquid transfer unit 33. The slag unit 32 can be built in the refining unit 31, and the refining unit 31 is connected to the liquid transfer unit 33. After the melt refining is completed in the melting furnace, the liquid is transferred into the pouring system 5 via the liquid transferring unit 33. The refining unit 31 is a natural gas regenerative melting furnace 31'. The melting furnace 31' is further provided with a stirring device 315 and a deaerator 316, respectively. The stirring device 315 is used to stir the magnesium alloy liquid in the melting furnace 31', and degassing. Device 316 is used to reduce the gas content of the magnesium alloy fluid (melt). The melting furnace 31' includes a magnesia crucible 311, a melting furnace body 312, a heating device 313, and a heating control device 314. The magnesia crucible 311 is placed on the melting furnace body 312, and the heating device 313 is heated by the magnesia crucible 311, and the heating control device 314 is heated. The heating device 313 is controlled to be heated. The fused magnesia 311 is made of a composite steel plate, the inner lining is a nickel-free steel plate, and the outer layer is a SUS310S stainless steel plate. The heating device 313 heats the magnesia crucible 311 by using natural gas as a fuel, and adopts a regenerative heat exchange combustion technology, which has high heat utilization rate, relatively low energy consumption, and saves resources. The degassing device 316 uses argon gas to spray the magnesium alloy liquid (melt) in the molten magnesium 311, thereby greatly reducing the gas content in the magnesium alloy liquid (melt), and refining the magnesium alloy liquid (melt). Reduce the content of solid impurities in the magnesium alloy solution (melt). The degassing device 316 includes an argon gas spray gun, a compressed air drying filter, a bottled argon gas and a pressure controller, an argon gas spray gun, a bottled argon gas and a pressure controller connected to the compressed air drying filter, and a pressure controller to control the compressed air drying filter. The argon gas in the bottled argon gas is dried by the compressed air drying filter and supplied to the argon gas spray gun, so as to ensure the dryness of the argon gas, prevent the water vapor from entering the magnesium alloy liquid (melt), and avoid the magnesium alloy caused by the water vapor. Liquid (melt) splash and secondary gas inclusions. The magnesium alloy liquid (melt) is processed by the refining unit 31, and then the magnesium slag in the magnesium alloy liquid (melt) is removed by the slag removing unit 32. The slag removing unit 32 includes a slag bag 321 and a gas blowing device 322. The package 321 is preheated and then submerged into the fused magnesium 311 in the smelting furnace, and the gas blowing device 322 blows the magnesium slag from the bottom of the fused magnesia 311 into the slag bag 321 to remove the magnesium alloy solution (melt). The magnesium slag in the middle improves the purity of the magnesium alloy in the magnesium alloy liquid (melt). It is to be noted that the gas injected in the gas injection device 322 is an inert gas to prevent the magnesium alloy liquid (melt) from being exposed to air oxidation.

The magnesium alloy liquid (melt) sequentially processed by the refining unit 31 (melting furnace 31') and the slag removing unit 32 is transferred to the casting system 5 through the liquid transferring unit 33 to form a magnesium alloy ingot, and the liquid transferring unit 33 includes a casting pump. 331, the liquid inlet pipe 332, the liquid discharge pipe 333 and the liquid transfer drive motor 334, the liquid inlet pipe 332 and the liquid discharge pipe 333 are all connected with the casting pump 331, and the liquid transfer drive motor 334 controls the rotation speed of the casting pump 331, and the liquid inlet pipe The magnesium alloy liquid (melt) is sucked into the casting pump 331 and then sent to the casting system 5 through the liquid discharge pipe 333. The liquid transfer drive motor 334 is a variable frequency speed control motor, which can be adjusted at any time under different conditions.

During the time during which the magnesium alloy liquid (melt) is transferred to the casting system 5 via the liquid transfer unit 34, in order to ensure that the magnesium alloy liquid (melt) remains in a liquid state, it will not be transferred from the melt refining system to the casting system. In the case of a condensation phenomenon, the inventors have added an insulation system 4 based on the production line of any of the above structures, and the heat retention system 4 is disposed between the melt refining system 3 and the pouring system 5, and is melted by the heat refining system 3 through the heat refining system 3. The magnesium alloy liquid (melt) is kept warm, so that the magnesium alloy liquid (melt) is kept in a liquid state, and the heat is allowed to stand for a long period of time to further improve the purity of the melt, and at the same time, it is convenient to control the temperature; The furnace 31' is produced smoothly and can be used for transfer.

FIG. 9 is a flow chart of an insulation system for a production line of a national standard magnesium alloy ingot based on magnesium alloy scrap provided by the present invention. As shown in FIG. 9, the heat preservation system 4 includes a holding furnace 41 and a gas protection unit 42. The gas protection unit 42 is disposed on the holding furnace 41, and a dry inert gas is introduced into the holding furnace 41 through the gas protecting unit 42 to prevent the magnesium alloy liquid. The (melt) is oxidized in the holding furnace 41.

The heat preservation furnace 41 includes a heat preservation crucible 411, a heat retention furnace body 412, a heat insulation heating device 413, a heat preservation control device 414, a heat preservation crucible 411 disposed on the heat preservation furnace body 412, and the heat retention heating device 413 is disposed in the heat preservation furnace body 412, and the heat insulation heating device 413 Connected to the heat retention control device 414, the heating temperature of the heat retention heating device 413 is controlled by the heat retention control device 414. The liquid outlet pipe 333 on the liquid transfer unit 34 communicates with the heat retention crucible 411, and the magnesium alloy liquid (melt) is passed through the liquid discharge pipe 332. It is delivered to the thermal insulation 411. Insulation crucible 411 is made of composite steel plate, the inner liner is nickel-free steel plate, and the outer layer is SUS310S stainless steel plate. A separator is provided in the heat preservation crucible 411, and the separator is divided into two to three sub-chambers, and the separator is made of a nickel-free steel sheet. The separator is provided with at least one liquid flow hole, preferably 1 to 3 liquid flow holes, and the distance of the liquid flow hole from the bottom of the heat preservation crucible 411 is 200-500 mm, and the magnesium alloy liquid (melt) is effectively intercepted through the liquid flow hole. The bottom slag and scale enter the casting system 5, ensuring the purity of the magnesium alloy fluid (melt) used in the casting system 5. The heat insulating device 413 employs a spiral high-resistance chrome-aluminum electric resistance wire as a heating element, and the electric resistance wire is embedded in the holding furnace body 412. The resistance wires are respectively corresponding to the compartments in the thermal insulation 411 during installation. The electric resistance wires in each sub-chamber of the thermal insulation crucible 411 are relatively independent, so that the heating regions corresponding to the respective sub-chambers of the thermal insulation crucible 411 are independently formed into zones, and the heating temperature can be independently adjusted by the thermal insulation control device 414 in each zone, thereby realizing the indoor compartments of the thermal insulation crucible 411. The magnesium alloy liquid (melt) is heated separately to make the heat dissipation distribution of each compartment more reasonable. It is to be noted that each holding furnace 41 cooperates with the smelting furnace 31' in the three to four molten refining systems 3 to improve the production efficiency, and the distance between the holding furnace 41 and each melting furnace 31' is not more than 1 m, preventing The solidification phenomenon occurs during the liquid transfer process of the melting furnace 31' and the holding furnace 41.

The gas protection unit 42 includes an air inlet 421, an exhaust port 422, and a gas protection device 423. The air inlet 421 and the exhaust port 422 are disposed on the heat retention crucible 411, and the gas protection device 423 includes a bottled inert gas, a pressure controller, and an introduction. The pipeline and the pressure controller are arranged on the introduction pipeline, the pressure controller controls the output flow rate of the bottled inert gas to the gas, and the introduction pipeline connects the bottle of the inert gas and the inlet port 421, so that the magnesium alloy liquid (melt) is contained in the heat preservation crucible 411 The inert gas is introduced into the surface of the magnesium alloy liquid (melt) without interruption, and the magnesium alloy liquid (melt) is prevented from coming into contact with oxygen to prevent oxidation.

The magnesium alloy scrap is melted by the melt refining system 3 to obtain a magnesium alloy liquid (melt), and the magnesium alloy liquid (melt) is kept in the heat preservation system 4 to ensure that the magnesium alloy liquid (melt) is poured before entering the pouring system 5 Keep it in a liquid state. In order to continuously cast the magnesium alloy liquid (melt) into a magnesium alloy ingot, improve the production efficiency of the magnesium alloy ingot, and improve the utilization rate of the magnesium alloy liquid (melt), and save resources, the inventor in the production line of any of the above structures On the basis of the improvement, the casting system 5 is improved, and the magnesium alloy liquid (melt) processed by the melt refining system 3 and the thermal insulation system 4 is rapidly cast into a magnesium alloy ingot to avoid impurity pollution, improve production efficiency, and improve magnesium alloy liquid. (melt) utilization, saving resources.

FIG. 10 is a flow chart of a pouring system for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to the present invention. As shown in FIG. 10, the pouring system 5 includes an ingot unit 51, a dosing pump 52, and a pouring control unit 53, into which a magnesium alloy liquid (melt) is injected into the ingot unit 51 via a dosing pump 52, and a casting control unit 53 and casting The ingot unit 51 is connected to the dosing pump 52, and the pouring control unit 53 controls the pouring speed of the dosing pump 52.

The ingot unit 51 includes an ingot casting machine 511, an ingot mold 512, and a conveying crawler belt 513. The ingot casting machine 511 is divided into a casting zone, a spindle cooling zone, a blanking zone, an ingot cooling zone, a preheating zone, and a coating spraying zone. The ingot mold 512 is installed on the conveying crawler 513 and sequentially passes through the pouring zone, the spindle cooling zone, the blanking zone, the ingot die cooling zone, the preheating zone and the coating spraying zone, and the quantitative pouring pump 52 places the magnesium alloy liquid in the pouring zone. The body is cast in the ingot mold 512. The transmission crawler 513 is controlled by a variable frequency speed regulating motor and a shaft mounted speed reducer, and the ingot mold 512 is controlled by the frequency conversion speed regulating motor and the shaft mounted speed reducer on the conveying crawler 513, and sequentially passes through the pouring zone, the spindle cooling zone, and the blanking. Zone, preheating zone and coating spray zone.

The pouring zone is a semi-closed zone, and the magnesium alloy liquid (melt) in the pouring process is protected by an inert gas. The spindle cooling zone uses air as a cooling medium to cool the cast spindle. The ingot cooling zone uses water as a cooling medium to cool the ingot after the blanking. The preheating zone uses natural gas or gas combustion as a preheating heat source. In addition to the pouring zone, the blanking zone, the ingot cooling zone and the coating spraying zone, all other areas of the ingot casting machine 511 In the closed area, a vacuum hood is provided in the enclosed area.

The quantitative pouring pump 52 is connected to the pouring control unit 53. The dosing pump 52 includes a pouring port 521 and a conductive probe 522. The pouring port corresponds to the pouring area of the ingot casting machine 511, and the two poles of the conductive probe 522 are respectively combined with the ingot mold. The ends of the metering pump 52 are electrically connected. The conductive probe 522 is tangent to the set magnesium alloy liquid height position. When the magnesium alloy liquid reaches the set height, the probe contacts the magnesium liquid to form a short circuit, and the pouring control unit receives the short circuit signal and then controls the quantitative pouring pump to stop pouring.

The magnesium alloy ingot formed by pouring in the pouring system 5 is a semi-finished product of the national standard magnesium alloy ingot, and the surface quality thereof is not up to standard. In order to achieve the surface quality of the semi-finished product of the national standard magnesium alloy ingot formed by the pouring system 5, the inventor adds a post-processing system 6 based on the production line of any of the above structures, and the after-treatment system 6 is disposed after the pouring system, after the passage The treatment system 6 treats the surface of the semi-finished product of the national standard magnesium alloy ingot, and obtains the finished product of the national standard magnesium alloy ingot.

The post-processing system 6 includes a polishing machine 61, a printer 62 and a baler 63. The semi-finished product of the national standard magnesium alloy ingot formed by the pouring system 5 is processed by the polishing machine 61, the printer 62 and the baler 63 to obtain the finished product of the national standard magnesium alloy ingot. .

The polishing machine 61 comprises a frame, a polished steel wire wheel, a polishing motor and a dust removing device. The polishing wire wheel is arranged on the frame, the polishing motor drives the polishing wire wheel to polish the semi-finished product of the national standard magnesium alloy ingot, and the dust removing device recovers the magnesium alloy produced by the polishing process and Magnesia oxide waste. The dust removal device adopts a wet dust removal method to directly pass magnesium alloy and magnesium oxide waste into a liquid solvent. The dust removing device communicates with the dust collecting hood in the ingot casting machine 511 to remove dust generated in the ingot casting machine 511. The printer 62 is a laser printer, which is simple in operation and high in efficiency.

In order to reduce environmental pollution and save resources, and make the entire production line safe and environmentally friendly, inventors have added environmental protection systems based on the production line of any of the above structures for the exhaust gas, magnesium slag and waste acid generated during the processing of magnesium alloy scraps. Through the environmental protection system 7, waste gas, magnesium slag and waste acid are generated in the entire production line to achieve zero discharge of exhaust gas, magnesium slag and waste acid in the entire production line, to protect the environment and save resources; accordingly, the environmental protection system 70 includes exhaust gas treatment The unit 71, the waste treatment unit 72, and the waste acid treatment unit 73, the exhaust gas treatment unit, the waste residue, and the waste acid treatment unit respectively process the exhaust gas, waste residue, and waste acid generated in the entire pickling line.

The exhaust gas treatment unit 71 is an acid gas spray tower for treating acid gas, and the acid gas spray tower comprises a fan, a filler, a spray device, a defogging device, a spray liquid circulation pump and an absorption tower; After the zero acid emissions of the acid gas are achieved, an environmentally friendly treatment of the exhaust gas can be achieved.

The exhaust gas treatment unit 71 further includes a sealed glass chamber, and the exhaust unit is disposed in the glass chamber, and the exhaust unit discharges the acid gas in the glass chamber into the sour gas spray tower. The rinsing unit of the pickling zone and the washing zone are disposed in the glass room to prevent acid gas from overflowing in the pickling zone and the rinsing unit, thereby reducing environmental pollution. The glass room is provided with a feeding door, a discharging door and a control sensor, and the control sensor controls the switch of the feeding door and the discharging door. When the magnesium alloy scrap material enters the pickling line, the feeding door is automatically opened and the feeding ends. After the automatic shutdown of the magnesium alloy waste material through the entire pickling line processing, the discharge door automatically opens and automatically closes after the discharge is completed.

The waste residue processing unit 72 is a magnesium slag recovery unit, including a recovery dissolution tank, a recovery filter, a recovery evaporation crystallizer, and a recovery calcination furnace, and the magnesium slag generated in the production line is sequentially recovered through a dissolution tank, a recovery filter, a recovery evaporation mold, and The recovered calciner is processed to obtain high-purity magnesium oxide and mixed chlorine salt to protect the environment and save resources.

The waste acid treatment unit 73 includes a neutralization tank, a filter, an evaporation crystallizer and a dryer which are sequentially connected, and the spent acid in the pickling zone is sequentially treated by a neutralization tank, a filter, an evaporation crystallizer and a dryer to obtain a magnesium salt, thereby Achieve zero emissions of waste acid, protect the environment, and save resources. The neutralization tank is connected to the acid passage.

Figure 11 is a flow chart of a production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap provided by the present invention. As shown in Fig. 11, the process of producing magnesium alloy ingot from magnesium alloy scrap is as follows: the magnesium alloy scrap is first treated by the pretreatment system 1 to select the magnesium alloy scrap and remove the surface oxide film and the like, and the pretreated The magnesium alloy waste is placed in the preheating system 2, and the magnesium alloy waste is dried and preheated, and the dried magnesium alloy waste is placed in the melt refining system 3 for melt refining, and the molten and refined magnesium alloy liquid (melt) is transferred to the heat preservation. The system 4 is insulated to prevent the magnesium alloy liquid (melt) from solidifying when transferred to the casting system 5, and the magnesium alloy liquid (melt) is transferred to the pouring system 5 in the heat insulating system 4 to form a national standard in the pouring system 5. The semi-finished magnesium alloy, the semi-finished product of the national standard magnesium alloy is placed in the post-treatment system 6, and the surface of the semi-finished product of the national standard magnesium alloy ingot is polished by the polishing machine 61 in the post-treatment system 6, and the finished product of the national standard magnesium alloy ingot with the surface quality is obtained. The exhaust gas, magnesium slag, and waste acid generated in the melt refining system 3 of the production line are respectively processed by the exhaust gas treatment unit 71, the waste residue processing unit 72, and the waste acid treatment unit 73 of the environmental protection system 7. The specific material flow is:

The magnesium alloy waste first enters the pretreatment system 1 and is manually sorted in the first sorting unit 171 of the sorting device 17 in order to remove the obvious impurities such as screws, rubber and other non-magnesium alloy scraps in the magnesium alloy scrap, and then enter the high pressure cleaning. The solid material device 101 of the device 10 is subjected to high pressure cleaning and then loaded into the drum 111 of the loading device 11; the lifting device 14 is lifted by the two lifting elements 1113 on the rotating shaft 116 to move to the pickling zone 12, and the rotating shaft 116 The upper two rotating bearings 1112 are respectively placed on the two pickling bearing seats 1211 of the pickling tank 121. The drum 11 is placed in the pickling tank 121, and the transmission gear 1111 of the rotating shaft 116 meshes with the motor gear 1121 of the driving motor 112 to drive The motor 112 drives the rotating shaft 116 to rotate, so that the drum 111 rotates in the pickling tank 121, and the magnesium alloy scrap in the drum 111 is randomly flipped with the movement of the drum 111, thereby ensuring sufficient contact between the magnesium alloy scrap and the acid solution, and at the same time the surface of the magnesium alloy scrap (especially The impurities in the groove are more likely to fall off during the turning process, and the harmful impurities on the surface of the magnesium alloy scrap are removed; after the pickling is finished, the drum 111 is placed in the washing zone 13 by the lifting device 14 to be rinsed. In the element 131, the two rotating bearings 1112 on the rotating shaft 116 are respectively placed on the two rinsing bearing seats 13111. The drum 11 is placed in the rinsing pool 1311, and the rotating shaft 116 is driven by the driving motor 112 to rotate and circulate the drum 111, and the drum 111 is rotated. The magnesium alloy scrap is randomly flipped with the movement of the drum 111 to ensure that the magnesium alloy scrap is in full contact with the water, and the magnesium alloy scrap is first washed in the rinsing tank 311 to remove the residual acid and residue on the surface of the magnesium alloy scrap; after the rinsing, the drum 111 is moved by the lifting device 14 and placed in the blanking unit 132. The drum 111 is assisted by the lifting device 14 to complete the blanking operation from the lower hopper 1321; One end of the spray conveyor belt 1333 of the unit 133 is disposed under the lower hopper 1321, and the magnesium alloy scrap from the lower hopper 1321 is laid on the spray conveyor belt 1333, and transported to the lower side of the water nozzle 1332 via the spray conveyor belt 1333. 1332 sprays the magnesium alloy scrap on the spray conveyor belt 1333, and the magnesium alloy scrap is washed twice by the shower unit 133 to remove the residual acid and residue remaining on the surface of the magnesium alloy scrap; the magnesium alloy scrap passes through the entire washing zone 13 After the end of the water washing, it is transported to the dehydration drying device 16. In the dehydration drying device 16, the liquid on the surface of the magnesium alloy scrap is firstly removed by the wind cutting unit 161, and then dried by hot air drying unit 162 again to obtain a dry and removed The magnesium alloy scrap of the surface layer; and then enters the second sorting unit 172 for the second sorting to ensure that the impurities of the non-magnesium alloy scrap in the magnesium alloy scrap are completely removed, so that the magnesium alloy scrap can be used as a direct raw material to produce the national standard magnesium alloy ingot. The pretreatment process is completed; then, the preheating system 22 of the preheating system 2 enters the drying tank 21, and the preheating air extracting device 23 draws out the water vapor in the drying tank 21 to be discharged. Preheating and drying; the magnesium alloy scrap enters the molten refining system 3 and is converted into a magnesium alloy melt, that is, a state of the magnesium alloy liquid, firstly heated and melted in the melting furnace 31' of the refining unit 31, and the deaerator 315 and degassing Under the operation of the device 316, the magnesium alloy liquid is refined and/or alloyed, and the magnesium slag in the magnesium alloy liquid is removed by the slag removing unit 32, which is a magnesia slag which is preheated and then immersed in the smelting furnace. In 311, the gas blowing device 322 blows the magnesium slag from the bottom of the fused magnesium crucible 311 into the slag bag 321 to remove the magnesium slag in the magnesium alloy melt, thereby improving the purity of the magnesium alloy in the magnesium alloy melt; The alloy liquid is then sucked into the casting pump 331 through the liquid inlet pipe 332 of the liquid transferring unit 33, and then sent to the heat insulating system 4 or the pouring system 5 through the liquid discharging pipe 333; and the magnesium alloy liquid in the heat insulating system 4 The liquid delivery pipe 316 is sent to the heat preservation 坩埚 411 of the heat preservation furnace 41 of the heat preservation system 4 for heat preservation and standing; the magnesium alloy liquid is injected into the ingot unit 51 through the quantitative pouring pump 52 under the controlled speed of the pouring control unit 53. Ingot mold 512 is cast into a magnesium alloy ingot; Aftertreatment system 6 sequentially through the polishing machine 61, printer 62 and packer 63 GB treatment to obtain a magnesium alloy ingot finished.

Finally, it is necessary to note that the above embodiments are only used to further explain the technical solutions of the present invention, and are not to be construed as limiting the scope of the present invention. Some of the above-described contents of the present invention are made by those skilled in the art. Non-essential improvements and adjustments are within the scope of the invention.

Claims

A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap, characterized in that it comprises: a pretreatment system, a melt refining system and a pouring system which are sequentially connected, and the magnesium alloy scrap is sequentially produced by a pretreatment system, a melt refining system and a pouring system. National standard magnesium alloy ingot.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the magnesium alloy scrap is a scrapped magnesium alloy product.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the pretreatment system comprises a high pressure cleaning device and a pickling production line.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 3, wherein the pickling production line comprises: a feeding device, a pickling zone and a water washing zone, and the magnesium alloy scrap is contained in the holding device, pickling The area and the washing area are set independently;

The material flow in the pickling production line: after the magnesium alloy waste is put into the feeding device, the raw material feeding device successively enters the pickling zone and the water washing zone to perform pickling and water washing.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 3, wherein the pickling production line comprises: a feeding device, a pickling zone, a water washing zone and a lifting device, wherein: the feeding device holds the magnesium alloy The waste material, the pickling zone and the water washing zone are independently arranged, and the lifting device drives the feeding device and moves the feeding device between the pickling zone and the washing zone;

The material flow in the pickling production line: after the magnesium alloy waste is put into the feeding device, the feeding device driven by the lifting device sequentially enters the pickling zone and the water washing zone for pickling and washing.
The production line of the national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, characterized in that the magnesium alloy scrap is pickled in the pickling zone and rinsed in the washing zone under the self-rotation of the holding device. .
The production line of the national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, wherein the feeding device is an electrically driven roller, the drum is filled with magnesium alloy scrap, and a rotating shaft is provided, and the rotating shaft penetrates the roller. .
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 7, wherein the drum is provided with a plurality of through holes, and the diameter of the through holes is smaller than the diameter of the magnesium alloy scrap.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 7, wherein the drum comprises a material inlet and a cover, and the material inlet and outlet can be opened and closed by the cover.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 9, wherein the cover plate is movably covered on the material inlet and outlet.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 7, wherein both ends of the rotating shaft are respectively provided with rolling bearings.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 7, characterized in that both ends of the rotating shaft are respectively provided with lifting elements which are movably connected with the hoisting device.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 12, wherein a transmission gear, a rolling bearing, a lifting component, a drum, a lifting component and a rolling bearing are sequentially disposed or mounted on the rotating shaft.
The production line of the national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 5, wherein the lifting device is an electric drive and a lifting assembly with a hanging hook, and the lifting hook cooperates with the lifting component of the feeding device to realize The driving material device sequentially completes the loading, the pickling zone, the pickling zone, the water washing zone, the water washing zone or the cutting action.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, wherein the pickling zone comprises a pickling tank, an acid passage and an acid passage, and the acid passage and the acid passage are respectively passed through The pickling tank is connected to the pickling tank.
The production line of the national standard magnesium alloy ingot based on the magnesium alloy scrap according to claim 15, wherein the both sides of the pickling tank are provided with a bearing seat, the mounting position of the bearing seat and the center line of the length direction of the pickling tank. Coaxial.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, wherein the washing zone comprises a rinsing unit, a blanking unit and a shower unit, and the acid washed magnesium alloy scrap passes through the rinsing unit in sequence. , the blanking unit and the shower unit, the magnesium alloy scrap is double washed by the rinsing unit and the shower unit.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 17, wherein the rinsing unit is a rinsing tank, and the drum in the hopper is self-rotating and rinsing the magnesium alloy scrap in the rinsing tank; The end is provided with a bearing seat, and the mounting position of the bearing seat is coaxial with the center line of the longitudinal direction of the rinsing pool.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 17, wherein the blanking unit is a lower hopper.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 17, wherein the spray unit comprises a water pressurizer, a water nozzle, a spray conveyor belt and a spray shield, a water nozzle and a water spray. The pressure device is arranged on one side of the spray conveyor belt, the water nozzle is connected with the water pressure device, and the magnesium alloy waste material is washed again in the spray unit through the water nozzle, and the spray protection cover is a three-sided protective cover and is disposed on the spray conveyor belt. On both sides and above.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 20, wherein the spray conveyor belt is a Vibrating conveyor belt plate.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 20, wherein the blanking unit is disposed at one end of the shower unit.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, wherein the pickling line further comprises a dehydration drying device for dehydrating and drying the acid washed and water washed material.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 23, wherein the dehydration drying device comprises a connected but not connected wind cut unit and a hot air drying unit; and the spray of the wind cut unit and the water washing area The unit is connected, and the magnesium alloy waste is dehydrated and dried through the air-cutting unit and the hot air drying unit through the shower unit.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 24, wherein the wind cutting unit comprises a wind cut air compressor, a wind cut conveyor belt, a wind cut nozzle and a wind cut shield, wherein: the wind cut The protective cover is a three-sided protective cover and is disposed on both sides of the wind-cut conveyor belt; the wind-cutting nozzle is installed in the wind-cut protective cover above the wind-cut conveyor belt; one end of the wind-cut conveyor belt is connected with the shower unit of the water washing zone, The other end is connected to the hot air drying unit; the air cut air compressor supplies pressurized air to the air cutting nozzle.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 24, wherein the hot air drying unit comprises a hot air air compressor, a heat source, a hot air nozzle, a heat drying conveyor belt and a heat drying shield, wherein: The hot-drying protective cover is arranged on both sides of the hot-drying conveyor belt on the two sides, and the hot air air compressor is connected with the heat source. The hot air nozzle is arranged above the heat-drying conveyor belt and is in the heat-drying protective cover, and the heat-drying conveyor belt is One end is connected to the wind-cut conveyor of the wind-cut unit.
The production line of the national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 4 or 5, wherein the pickling line further comprises an automatic acid-reserving acid-changing system, wherein the automatic acid-reserving acid-changing system comprises a pH test. Instrument, Mg 2+ concentration detector, electric control valve, acid quantitative pump, water quantitative pump and control unit, wherein: pH value tester, Mg 2+ concentration detector and electric control valve are partially set in the pickling tank, acid quantification The pump, the water metering pump and the control unit are partially arranged outside the pickling tank; the pH value meter, the Mg 2+ concentration detector, the electric control valve, the acid metering pump and the water metering pump are connected to the control unit data, preferably in parallel with each other. The pH tester is used to periodically test the acidity of the acid solution in the pickling tank. The Mg 2+ concentration detector is used to detect the Mg 2+ concentration in the pickling tank in real time. The pH tester and the Mg 2+ concentration detector will measure the signal. It is transmitted to the control unit, and the operation of the electric control valve, the acid quantitative pump and the water quantitative pump is controlled by the control unit; the electric control valve controls the acid out of the acid passage, and the acid quantitative pump controls the acid input into the acid passage.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 27, wherein when the pH value of the pH tester is lower than the set pH range, the control unit controls the acid metering pump to open after receiving the signal. The acid channel opens to acidify the pickling tank.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 27, wherein when the detected value of the Mg 2+ concentration detector exceeds the set Mg 2+ concentration range, the control unit receives the signal and controls the electric motor. The control valve is opened, the acid outlet channel is opened, and the acid is automatically discharged. After the acid is discharged, the electric control valve is closed, and the control unit simultaneously controls the acid metering pump and the water metering pump to be turned on, and the acid solution is reconfigured according to the set ratio.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 27, wherein the pH ranges from 0 to 7, and the Mg 2+ concentration ranges from 0.0 to 3.0 mol/L.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 3, wherein the high pressure cleaning device in the pretreatment system is used as an initial washing device before pickling of the magnesium alloy waste, and the high pressure cleaning device comprises a A self-rotating porous solid material device and a high-pressure cleaning machine; wherein the magnesium alloy waste material is built in the solid material device, and can rotate in the solid material device according to the self-rotation of the solid material device, and the high-pressure water generated by the cleaning nozzle of the high-pressure cleaning machine Evenly impacting waste;

The material flow of the magnesium alloy waste in the pretreatment system is as follows: the magnesium alloy waste is subjected to high pressure cleaning by a high pressure cleaning device and then into a pickling production line for further cleaning.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 31, wherein the solid material device is cylindrical.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 31, wherein the cleaning nozzle of the high pressure cleaner is built in the solid material device and uniformly distributed along the central axis direction of the solid material device.
The production line of the national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 3, characterized in that the pretreatment system further comprises a sorting device for removing impurities of the non-magnesium alloy scrap in the magnesium alloy scrap.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 34, wherein the sorting device comprises a first sorting unit and a second sorting unit, and the first sorting unit is disposed in front of the high pressure cleaning device The second sorting unit is disposed after the pickling line;

The material flow of the magnesium alloy waste in the pretreatment system is as follows: the first sorting unit of the magnesium alloy scrap is sorted and removed, and then subjected to high pressure cleaning by a high pressure cleaning device, then enters the pickling line for further cleaning, and then passes through the second sorting unit again. Sorting and removing impurities.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 35, wherein the second sorting unit is connected to the dehydration drying zone and disposed after the dehydration drying zone.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 36, wherein the second sorting unit is located at the tail of the dewatering and drying conveyor belt.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 37, wherein the second sorting unit transport belt and the drying transport belt are the same transport belt.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the production line is further included Including a preheating system, the preheating system is disposed between the pretreatment system and the melt refining system for further removing moisture from the magnesium alloy scrap processed by the pretreatment system, wherein the material flow is: the magnesium alloy scrap is processed by the pretreatment system After that, it is preheated by the preheating system, and then enters the melt refining system for refining into a magnesium alloy liquid.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 39, wherein the preheating system comprises a drying box, a holding container and a preheating air extracting device, and the holding container is movably mounted in the drying box. The preheating air suction device is installed in the drying box, and the magnesium alloy waste is placed in the drying box through the holding container, and the preheating air suction device draws out the water vapor in the drying box.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the molten refining system comprises a refining unit, a slag removing unit and a liquid transferring unit, and the slag removing unit can be built in the refining unit, and the refining unit Connected to the liquid transfer unit, the magnesium alloy liquid is transferred into the pouring system through the liquid transfer unit after the melting and refining of the melting furnace is completed.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 41, wherein the refining unit is a natural gas regenerative melting furnace, and the melting furnace is further provided with a stirring device and a deaerator, and the stirring is performed. The device is used to agitate the molten liquid in the melting furnace, and the degassing device is used to reduce the gas content in the magnesium alloy liquid.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 42, wherein the degassing device uses argon gas to spray a magnesium alloy liquid in the molten magnesia.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 41, wherein the slag removing unit comprises a slag bag and a gas blowing device, and the molten slag is preheated and then immersed in the smelting furnace. In the middle, the gas injection device blows the magnesium slag into the slag bag from the bottom of the fused magnesia.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 41, wherein the liquid transfer unit comprises a casting pump, an inlet pipe, an outlet pipe and a liquid transfer drive motor, an inlet pipe and an outlet pipe. Both are connected to the casting pump, and the liquid transfer drive motor controls the rotational speed of the casting pump. The inlet pipe draws the magnesium alloy liquid into the casting pump and then delivers it to the casting system through the liquid outlet pipe.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the production line further comprises a heat preservation system, and the heat preservation system is disposed between the melt refining system and the pouring system, and the heat insulation system is used to The magnesium alloy solution of the melt refining system is kept warm.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 46, wherein the heat preservation system comprises a holding furnace and a gas protection unit, and the gas protection unit is disposed on the holding furnace and is passed through the gas protection unit to the holding furnace. Pass dry inert gas.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the pouring system comprises an ingot unit, a quantitative pouring pump and a pouring control unit, and the magnesium alloy liquid is injected into the ingot unit through the quantitative pouring pump. The pouring control unit is connected to the ingot unit and the dosing pump.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the ingot unit comprises an ingot casting machine, an ingot mold and a conveying crawler, and the ingot casting machine is divided into a pouring zone, a spindle cooling zone, and a lower The material area, the ingot mold cooling area, the preheating area and the coating spraying area, the ingot mold is installed on the conveying track, and sequentially passes through the pouring area, the spindle cooling area, the blanking area, the ingot mold cooling area, the preheating area and the coating spray. In the zone, the metering pump pumps the magnesium alloy in the ingot mold in the casting zone.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the production line further comprises a post-processing system, the post-processing system is disposed after the pouring system, and the post-processing system is applied to the national standard magnesium alloy. The surface treatment of the ingot semi-finished product makes the surface quality of the magnesium alloy ingot reach the standard.
The production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 1, wherein the production line further comprises an environmental protection system, wherein the environmental protection system comprises an exhaust gas treatment unit, a waste residue and a waste acid treatment unit, respectively. The exhaust gas treatment unit, the waste residue and the waste acid treatment unit respectively process the exhaust gas, waste residue and waste acid generated in the entire pickling line.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 51, wherein the exhaust gas treatment unit is an acid gas spray tower for treating acid gas, and the acid gas spray tower comprises a fan and a filler. , spray device, defogging device, spray liquid circulation pump and absorption tower.
A production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 52, wherein the exhaust gas treatment unit further comprises a sealed glass chamber, the exhausting machine is disposed in the glass chamber, and the exhausting machine is disposed in the glass chamber. The acid gas is discharged into the sour gas spray tower.
The production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 51, wherein the waste residue processing unit is a magnesium slag recovery unit, comprising a recovery dissolution tank, a recovery filter, a recovery evaporation crystallizer, and a recovery calciner. The magnesium slag produced in the production line is processed by the recovery dissolution tank, the recovery filter, the recovery evaporative crystallizer and the recovery calciner to obtain high-purity magnesium oxide and mixed chlorine salt.
A production line of a national standard magnesium alloy ingot based on magnesium alloy scrap according to claim 51, wherein the waste acid treatment unit comprises a neutralization tank, a filter, an evaporative crystallizer and a dryer, which are sequentially connected, and the waste of the pickling zone. The acid is sequentially treated through a neutralization tank, a filter, an evaporative crystallizer, and a dryer to obtain a dried magnesium salt.
A production line for producing a national standard magnesium alloy ingot based on magnesium alloy scrap according to any one of claims 1 to 5, characterized in that the production line comprises a pretreatment system, a preheating system, a melt refining system, a heat preservation system and a gating system. The magnesium alloy waste is cleaned and removed by the pretreatment system, and then preheated by the preheating system to enter the melt refining system for refining and/or alloying into magnesium alloy liquid, and then the magnesium alloy liquid is maintained by the thermal insulation system, and finally poured by the pouring system. Chengguo standard magnesium alloy ingot.