CN113357907A - Rotary furnace device and method for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation - Google Patents
Rotary furnace device and method for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation Download PDFInfo
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- CN113357907A CN113357907A CN202110598429.5A CN202110598429A CN113357907A CN 113357907 A CN113357907 A CN 113357907A CN 202110598429 A CN202110598429 A CN 202110598429A CN 113357907 A CN113357907 A CN 113357907A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide (Fe2O3)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
Abstract
The invention discloses a rotary furnace device and a method for processing oily waste by strengthening oxidation roasting of neodymium iron boron alloy, comprising a front fixed end cover, a rear fixed end cover and a rotary furnace body which is rotatably arranged between the two fixed end covers; at least one reinforced aeration pipe is arranged in the rotary kiln body, and the front end opening of the reinforced aeration pipe is connected with a blower; the lower surface of the strengthening aeration pipe is provided with a plurality of aeration holes, and the strengthening aeration pipe is divided into a dense area, a transition area and a sparse area according to the density of the aeration holes in the front-to-back direction in the rotary kiln body; the reinforced aeration pipe is provided with temperature measuring thermocouples on the pipe walls of the dense area, the transition area and the sparse area respectively; each temperature thermocouple is connected with a temperature aeration control system arranged outside the rotary kiln body, and the temperature aeration control system controls the output air flow of the air blower according to the temperatures of different areas in the rotary kiln body. The invention can optimize the oxidizing roasting of the waste and accelerate the waste disposal speed.
Description
Technical Field
The invention belongs to the field of waste resource utilization, and particularly relates to a rotary furnace device and a method for processing oil-containing waste by using temperature-controlled reinforced oxidation roasting neodymium-iron-boron alloy.
Background
In the production process of the sintered neodymium-iron-boron alloy permanent magnet, 30-40% of waste materials can be generated due to cutting, polishing, oxidation waste and the like, the element composition of the waste materials is basically the same as that of alloy materials, the content of rare earth elements in the waste materials is far higher than that in rare earth ores, the rare earth elements in the processed waste materials are recycled, and the sintered neodymium-iron-boron alloy permanent magnet has extremely high economic value and social environmental protection benefits. The process for recovering rare earth elements from waste neodymium iron boron alloy is mainly divided into direct utilization, pyrogenic recovery, wet recovery, ionic liquid extraction recovery and the like. The direct utilization of the oily waste materials in the neodymium iron boron alloy processing and the pyrogenic recovery require that the oxidation degree of the neodymium iron boron alloy in the raw materials is low and the requirement on the raw materials is high, and the new processes such as ionic liquid extraction are further improved, so that the wet recovery has strong adaptability to the materials and the recovery efficiency and the product purity are high. At present, aiming at the oily waste material of neodymium iron boron alloy processing, because the waste material is produced in different steps in the neodymium iron boron alloy processing process, the oxidation degrees of the waste materials from different sources are different, the component compositions are different, and the wet recycling has great advantages.
The main method of the wet recovery process comprises a hydrochloric acid total dissolution method, a hydrochloric acid optimum dissolution method, a complex salt precipitation method and the like, the hydrochloric acid total dissolution method for recovering neodymium iron boron waste has the defects of complex flow, large consumption of chemical reagents, high cost, serious secondary pollution, incomplete separation of rare earth elements and the like, the complex salt precipitation method also has the problems of complex flow, large consumption of reagents, to-be-improved recovery efficiency and the like, and cutting oil contained in the oily waste has influence on the acid dissolution efficiency of the processes such as the hydrochloric acid total dissolution method, the complex salt precipitation method and the like, so that part of rare earth elements cannot be dissolved, and the recovery rate of rare earth is reduced. The hydrochloric acid optimum dissolution method, namely an oxidizing roasting-hydrochloric acid dissolution method, comprises the steps of oxidizing and roasting waste materials to remove organic matters, oxidizing iron and neodymium into ferric oxide and neodymium oxide, reacting roasted products with hydrochloric acid, preferentially dissolving rare earth elements by controlling the pH value of a solution, and precipitating and separating to obtain pure neodymium oxide. The key point of the hydrochloric acid optimum solution method for efficiently recovering the rare earth lies in the optimization control of the oxidizing roasting process, iron and neodymium in the waste are oxidized into ferric oxide and neodymium oxide, the high-temperature agglomeration of particles is avoided, and the formation of ferrous oxide is avoided. The oxidizing roasting of the oily waste is not only an essential step of the hydrochloric acid optimum dissolution method, but also a required step of other various wet recovery processes.
The rotary furnace is widely applied to oxidation treatment of wastes, is simple to operate and control, has no complex moving parts in the furnace, and has good adaptability to materials. The method for processing the oily waste by oxidizing and roasting the neodymium-iron-boron alloy by the rotary furnace is a common method in industry, and in the process of oxidizing and roasting the oily waste by the rotary furnace, due to the characteristics of flammability, easy oxidation, high density and the like of the oily waste, the waste is extremely easy to be subjected to thermal oxidation combustion in the rotary furnace, so that the temperature of the front half section of the rotary furnace close to a feed port is overhigh, the oily waste is sintered into blocks, the internal neodymium and iron are not completely oxidized, the oxidized products on the surface of the stacked material are subjected to overhigh heating temperature to further react, change and agglomeration of a crystalline phase tissue, and the like, thereby influencing the separation of neodymium and iron oxide in the subsequent recovery step, reducing the recovery efficiency of neodymium, increasing the concentration of ferrous ions in the superior hydrochloric acid solution and improving the recovery cost.
In order to control the oxidative combustion of the waste material near the feeding hole of the rotary kiln, the feeding amount needs to be reduced, the rotating speed of the rotary kiln needs to be reduced, and the oxidative roasting treatment speed of the rotary kiln on the oily waste material is further reduced, so that the oxidative roasting step becomes an important factor for limiting the speed and the recovery rate of the oily waste material recovered by the hydrochloric acid preferential dissolution method.
Disclosure of Invention
The invention provides a rotary furnace device for strengthening oxidizing roasting of oily waste in neodymium iron boron alloy processing, which can solve the problems of waste accumulation and combustion, incomplete material oxidation, phase change caused by local high-temperature overheating of materials and the like in the process of treating oily waste in neodymium iron boron alloy processing by using the conventional rotary kiln, thereby optimizing the oxidizing roasting of the waste and accelerating the waste treatment speed.
A rotary furnace device for processing oily waste by strengthening oxidation roasting of neodymium iron boron alloy comprises a front fixed end cover, a rear fixed end cover and a rotary kiln body which is rotatably arranged between the two fixed end covers;
the interior of the rotary kiln body is provided with at least one reinforced aeration pipe, the front end and the rear end of the reinforced aeration pipe are respectively fixed at the positions close to the lower end on the front fixed end cover and the rear fixed end cover, and the front end opening of the reinforced aeration pipe is connected with a blower;
the lower surface of the reinforced aeration pipe is provided with a plurality of aeration holes, and the reinforced aeration pipe is divided into a dense area, a transition area and a sparse area according to the density of the aeration holes in the front-to-back direction in the rotary kiln body; the reinforced aeration pipe is provided with temperature measuring thermocouples on the pipe walls of the dense area, the transition area and the sparse area respectively; each temperature thermocouple is connected with a temperature aeration control system arranged outside the rotary kiln body, and the temperature aeration control system controls the output air flow of the air blower according to the temperatures of different areas in the rotary kiln body monitored by the temperature thermocouples.
In the invention, a specially designed reinforced aeration pipe and a temperature control thermocouple are added in the rotary furnace, a temperature aeration amount control system is added outside the rotary furnace, the oxidation roasting process of waste materials becomes more controllable through the added reinforced aeration pipe, the temperature information in the rotary furnace is monitored in real time through the thermocouple, and the aeration flow is timely adjusted according to the temperature change, so that the system stably operates.
Furthermore, the rear fixed end cover is provided with an in-kiln video monitor and a burner at one side facing the rotary kiln body.
Further, a feed inlet connected with the feeder is formed in the position, close to the upper end, of the front fixing end cover, and a discharge outlet is formed in the lower end portion of the rear fixing end cover.
The discharge gate be connected with ejection of compact collecting bin, ejection of compact collecting bin on be connected with the draught fan.
Further, a material pretreatment device is arranged at the upstream of the feeder and is used for mixing the oily waste materials from different sources according to different proportions of heat values, mixing and stirring the mixed waste materials and the 40-20-mesh coarse and fine quartz sand according to the proportion of 7: 1-10: 1, screening the mixture by a 10-mesh standard screen to obtain a material entering a furnace, and re-crushing the material larger than 10 meshes.
Preferably, the front end and the rear end of the reinforced aeration pipe are respectively fixed with the positions, close to the lower end, of the front fixed end cover and the rear fixed end cover by 15-30 cm. Because the strengthening aeration pipe is close to the lower part of the rotary kiln body, the disturbance of air flow in the rotary kiln can be strengthened, the sintering and agglomeration of oxidation products caused by overhigh local temperature of the oily waste combustion are avoided, the speed of the rotary kiln for treating the oily waste processed by the neodymium-iron-boron alloy is obviously improved, meanwhile, the oxidation combustion of the oily waste and the oxidation of neodymium, iron and boron are accelerated, the complete oxidation of iron into ferric oxide is promoted, and the interference effect of ferrous ions on the subsequent recovery steps is avoided.
Preferably, the diameters of aeration holes on the reinforced aeration pipe are 8-15 mm, and the interval between adjacent aeration holes is 30-50 mm in a dense area; in the transition zone, the interval between adjacent aeration holes is 150-250 mm; in the sparse zone, the interval between adjacent aeration holes is 300-450 mm.
The invention also provides a method for processing the oily waste by using the reinforced neodymium-iron-boron alloy, which uses the rotary furnace device and comprises the following steps:
step 1, mixing oil-containing wastes of different sources according to different proportions according to the heat value, controlling the heat value of the mixed waste to be 5000-6500 KJ/Kg, mixing and stirring the mixed waste and coarse and fine quartz sand of 40-20 meshes according to the proportion of 7: 1-10: 1, sieving the mixture with a standard sieve of 10 meshes to obtain a furnace inlet waste, and re-crushing the material with the granularity larger than 10 meshes;
step 2, heating the rotary kiln body (1) by using a burner, starting an air blower (6) to supply air for the reinforced aeration pipe (2), and waiting for the temperature in the rotary kiln body to be stabilized at 450-550 ℃;
the temperatures of different areas in the furnace are measured in real time by a thermocouple in the roasting process, and when the temperature rises, the temperature aeration amount control system (4) increases the air flow output by the air blower (6), increases the aeration flow and promotes more heat to be taken away by the air flow; when the temperature is reduced, the aeration flow is reduced;
step 4, the waste material is gradually rotated and moved downwards after being combusted in the dense area, and in the process of moving downwards to the transition area and the sparse area, the aeration airflow continuously blows the waste material, so that the incompletely oxidized iron in the waste material is further oxidized into ferric oxide;
and 5, dropping the waste subjected to oxidizing roasting into a material collecting bin arranged at the tail part of the rotary kiln.
Furthermore, in the step 3 and the step 4, the dust distribution in the rotary kiln body (1) is observed through videos, and the feeding speed, the aeration flow and the rotary kiln rotating speed are adjusted, so that the oxidizing roasting of the oily waste in the rotary kiln is efficiently carried out.
Compared with the prior art, the invention has the following beneficial effects:
1. the special reinforced aeration pipe and the temperature control thermocouple are added in the rotary furnace, the temperature aeration amount control system is added outside the rotary furnace, the oxidation roasting process of the waste materials is more controllable through the added reinforced aeration pipe, the temperature information in the rotary furnace is monitored in real time through the thermocouple, the aeration flow is timely adjusted according to the temperature change, the temperature of each area in the rotary furnace tends to be uniform, the occurrence of local overheating areas is avoided, and the system is stably operated.
2. The aeration is constantly carried out to the intensive district of material to the reinforcing aeration pipe that increases for the oxidation burning of oily waste material and the oxidation of neodymium, iron, boron, promote the iron to become ferric oxide completely, avoided the interference effect of ferrous ion to follow-up recovery step, make follow-up separation recovery process go on more efficiently, can replace the oxalic acid with ammonium bicarbonate of relative low price simultaneously, reduce cost improves economic benefits. Meanwhile, airflow disturbance in the rotary furnace is strengthened, sintering and agglomeration of oxidation products caused by overhigh local combustion temperature of the oily waste are avoided, the speed of treating the oily waste processed by the neodymium iron boron alloy in the rotary furnace is obviously improved, and the service efficiency of equipment is improved.
3. The invention is divided into a dense area, a transition area and a sparse area according to the density of aeration holes on the lower surface of the reinforced aeration pipe, and the aeration holes in the dense area play roles in providing oxygen for combustion and oxidation of oily waste, blowing materials, absorbing heat and taking away smoke pollutants; the aeration ports in the transition area and the sparse area play roles in strengthening airflow disturbance in the furnace, blowing downward material turning and supplementing oxidizing air.
Drawings
FIG. 1 is a schematic structural view of a rotary furnace apparatus for processing oily waste by using a reinforced neodymium-iron-boron alloy according to the present invention;
fig. 2 is a schematic structural view of a reinforced aeration pipe in an embodiment of the present invention.
In the figure: 1-a rotary kiln body, 2-a reinforced aeration pipe, 21-an aeration hole, 3-a temperature thermocouple, 4-a temperature aeration amount control system, 5-a feeder, 6-a blower, 7-a discharge collection bin, 8-an in-kiln video monitor, 9-a combustor, 10-an induced draft fan, 11-a front fixed end cover, 12-a rear fixed end cover and 13-a material pretreatment device.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in figure 1, the rotary furnace device for processing oily waste by strengthening oxidation roasting of neodymium iron boron alloy comprises a front fixed end cover 11, a rear fixed end cover 12 and a rotary kiln body 1 which is rotatably arranged between the two fixed end covers.
A reinforced aeration pipe 2 is arranged in the rotary kiln body 1, the front end and the rear end of the reinforced aeration pipe 2 are respectively fixed with the positions, close to the lower end, of a front fixed end cover 11 and a rear fixed end cover 12, and the front end opening of the reinforced aeration pipe 2 is connected with a blower 6.
The rear fixed end cover 12 is provided with an in-kiln video monitor 8 and a burner 9 on the side facing the rotary kiln body 1. The front fixed end cover 11 is provided with a feeding hole connected with the feeder 5 at a position close to the upper end, and a material pretreatment device 13 is arranged at the upstream of the feeder 5. The lower tip of back fixed end cover 12 is equipped with the discharge gate, and the discharge gate is connected with ejection of compact collection storehouse 7, is connected with draught fan 10 on the ejection of compact collection storehouse 7.
The lower surface of the strengthening aeration pipe 2 is provided with a plurality of aeration holes 21, and the strengthening aeration pipe 2 is divided into a dense area, a transition area and a sparse area according to the density of the aeration holes 21 in the front-to-back direction in the rotary kiln body 1. The enhanced aeration pipe 2 is provided with temperature thermocouples 3 on the pipe walls of the dense area, the transition area and the sparse area respectively; each temperature thermocouple 3 is connected with a temperature aeration control system 4 arranged outside the rotary kiln body 1, and the temperature aeration control system 4 controls the output air flow of the air blower 6 according to the temperatures of different areas in the rotary kiln body 1 monitored by the temperature thermocouples 3.
In this embodiment, the rotary kiln body 1 is 5m long and 0.8 m in inner diameter. The outer diameter of the reinforced aeration pipe 2 is 70mm, the inner diameter of the reinforced aeration pipe is 50mm, a pipeline is connected into a rear fixed end cover 12 communicated with the rotary kiln body 1 from a front fixed end cover 11 of the rotary kiln body 1, the reinforced aeration pipe 2 is arranged 20cm above the lowest point of the inlet end of the rotary kiln, and an aeration hole is formed in the lower part of the reinforced aeration pipe 2. Strengthening aeration pipe 2 and being close to feed inlet end (cloth tuber pipe front end) and offering diameter 10 mm's aeration hole every 40mm, this type of aeration hole definition is intensive district aeration hole, sets up 20 altogether, and aeration hole that diameter 10mm was offered every 190mm behind the intensive district of aeration sets up 10 altogether, and the definition is transition district aeration hole, and aeration hole that diameter 10mm was offered every 390mm behind the aeration transition district is offered to aeration transition district, sets up 4 altogether, and the definition is sparse district aeration hole. In-furnace temperature thermocouples 3 are respectively arranged on different aeration sections of the reinforced aeration pipe 2 to monitor the in-furnace temperature of different sections. The aeration holes in the dense area play a role in providing oxygen for the combustion and oxidation of the oily waste, blowing materials, absorbing heat and taking away smoke pollutants; the aeration holes in the transition area and the sparse area play roles in strengthening airflow disturbance in the furnace, blowing downward material turning and supplementing oxidizing air.
The high-speed airflow generated by the strengthening aeration pipe 2 not only provides oxidation air and absorbs and carries heat, but also blows the waste in the furnace, avoids forming massive deposits, and makes the waste oxidized more uniformly. The waste material is gradually rotated and moved downwards after being combusted in the dense area, and the aeration airflow continuously heats and blows the waste material in the downward movement process, so that the incompletely oxidized iron in the waste material is further oxidized into ferric oxide.
By strengthening the aeration purging effect of the aeration pipe 2, organic matters in the waste are completely oxidized with neodymium and iron, part of heat released in the material oxidation process is used for maintaining the reaction, and part of heat is absorbed by airflow and then is used for heating the rear half section of the rotary furnace. In the actual waste disposal process, because the calorific value of the oily waste is relatively high (>5000J/g), the heat released by the oxidation reaction is enough to maintain the disposal temperature of the rotary furnace at the target temperature (500-550 ℃), and auxiliary fuel is not needed.
The practical process of the rotary kiln apparatus of the present invention will be described below by way of specific examples.
Before the oily waste material of neodymium iron boron alloy processing is oxidized and roasted, the oily waste materials (cutting material oil sludge, stub bar oil sludge and water abrasive material oil sludge) of three different heat values are processed according to the following steps of 2: 2: 1, the mixed waste material is treated by crushing and screening, the heat value of the mixed waste material is in the range of 5000-5500KJ/Kg, the feeding heat value is enough to maintain the operation of the rotary kiln, and auxiliary fuel is not needed. Firstly, the rotary furnace is heated by the burner 9, the blower 6 is started to blow air through the reinforced aeration pipe 2, the mixed waste is sent into the rotary furnace through the feeder 5 after the temperature in the rotary furnace is stabilized at about 500 ℃, the falling process of the waste is firstly blocked and divided by the reinforced aeration pipe 2, and the phenomenon that large waste directly falls into the rotary furnace is reduced. The waste material is heated to generate oxidation combustion, meanwhile, the waste material starts to move slowly under the action of the blowing of the aeration airflow and the rotation of the rotary furnace, the temperature in the furnace is promoted to rise by the heat released by the oxidation combustion, and the combustor 9 is closed after the temperature in the furnace exceeds 550 ℃.
The oily waste is processed by adopting the intensified oxidized neodymium iron boron alloy in the rotary furnace with temperature control, the temperature in the rotary furnace is monitored in real time through the temperature thermocouple 3, the dust distribution in the rotary furnace is observed through the video monitor 8 in the rotary furnace, and the feeding speed, the aeration flow and the rotary speed of the rotary furnace are adjusted, so that the oxidizing roasting of the oily waste in the rotary furnace is efficiently carried out. And in the running process of the rotary furnace, the working load of the tail induced draft fan 10 is adjusted in real time according to the aeration quantity, a certain negative pressure is maintained in the kiln, and the exhaust gas of the rotary furnace is discharged through a chimney after passing through a tail gas treatment system.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A rotary furnace device for processing oil-containing waste by roasting neodymium iron boron alloy through enhanced oxidation is characterized by comprising a front fixed end cover (11), a rear fixed end cover (12) and a rotary kiln body (1) which is rotatably arranged between the two fixed end covers;
at least one reinforced aeration pipe (2) is arranged in the rotary kiln body (1), the front end and the rear end of the reinforced aeration pipe (2) are respectively fixed on the front fixed end cover (11) and the rear fixed end cover (12) near the lower end, and the front end opening of the reinforced aeration pipe (2) is connected with a blower (6);
the lower surface of the reinforced aeration pipe (2) is provided with a plurality of aeration holes, and the reinforced aeration pipe (2) is divided into a dense area, a transition area and a sparse area according to the density of the aeration holes in the front-to-back direction in the rotary kiln body (1); the reinforced aeration pipe (2) is provided with temperature thermocouples (3) on the pipe walls of the dense area, the transition area and the sparse area respectively; each temperature thermocouple (3) is connected with a temperature aeration amount control system (4) arranged outside the rotary kiln body (1), and the temperature aeration amount control system (4) controls the output air flow of the air blower (6) according to the temperatures of different areas in the rotary kiln body (1) monitored by the temperature thermocouples (3).
2. The rotary kiln plant for processing oily wastes through the intensified oxidation roasting of neodymium-iron-boron alloy according to claim 1, characterized in that the rear fixed end cover (12) is provided with an in-kiln video monitor (8) and a burner (9) at the side facing the rotary kiln body (1).
3. The rotary furnace device for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation according to claim 1, characterized in that a feed inlet connected with a feeder (5) is arranged at the position close to the upper end of the front fixed end cover (11), and a discharge outlet is arranged at the lower end part of the rear fixed end cover (12).
4. The rotary furnace device for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation according to claim 3, characterized in that the discharge port is connected with a discharge collection bin (7), and the discharge collection bin (7) is connected with an induced draft fan (10).
5. The rotary furnace device for processing oily waste by strengthening, oxidizing and roasting neodymium iron boron alloy according to claim 3, characterized in that a material pretreatment device (13) is arranged at the upstream of the feeder (5).
6. The rotary furnace device for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation according to claim 1, characterized in that the front end and the rear end of the enhanced aeration pipe (2) are respectively fixed with the positions, close to the lower ends by 15-30 cm, of the front fixed end cover (11) and the rear fixed end cover (12).
7. The rotary furnace device for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation according to claim 1, characterized in that the diameters of aeration holes on the enhanced aeration pipe (2) are 8-15 mm, and in a dense area, the interval between adjacent aeration holes is 30-50 mm; in the transition zone, the interval between adjacent aeration holes is 150-250 mm; in the sparse zone, the interval between adjacent aeration holes is 300-450 mm.
8. A method for processing oily waste by strengthening oxidizing roasting neodymium iron boron alloy is characterized in that the rotary furnace device of any claim 1 to 7 is used, and comprises the following steps:
step 1, mixing oil-containing wastes of different sources according to different proportions according to the heat value, controlling the heat value of the mixed waste to be 5000-6500 KJ/Kg, mixing and stirring the mixed waste and coarse and fine quartz sand of 40-20 meshes according to the proportion of 7: 1-10: 1, sieving the mixture with a standard sieve of 10 meshes to obtain a furnace inlet waste, and re-crushing the material with the granularity larger than 10 meshes;
step 2, heating the rotary kiln body (1) by using a burner, starting an air blower (6) to supply air for the reinforced aeration pipe (2), and waiting for the temperature in the rotary kiln body to be stabilized at 500-550 ℃;
step 3, in the operation process of the rotary kiln body (1), aerating the rotary kiln body (1) through aeration holes in a dense area, a transition area and a sparse area on the reinforced aeration pipe (2), feeding the furnace feeding waste prepared in the step 1 into the furnace through a feeder, heating and combusting the waste and oxidizing the iron and neodymium, taking away part of heat generated by waste combustion and neodymium and iron oxidation and combustion gas products by aeration airflow, and using the residual heat to maintain the oxidation reaction of the materials;
the temperatures of different areas in the furnace are measured in real time by a thermocouple in the roasting process, and when the temperature rises, the temperature aeration amount control system (4) increases the air flow output by the air blower (6), increases the aeration flow and promotes more heat to be taken away by the air flow; when the temperature is reduced, the aeration flow is reduced;
step 4, the waste material is gradually rotated and moved downwards after being combusted in the dense area, and in the process of moving downwards to the transition area and the sparse area, the aeration airflow continuously blows the waste material, so that the incompletely oxidized iron in the waste material is further oxidized into ferric oxide;
and 5, dropping the waste subjected to oxidizing roasting into a material collecting bin arranged at the tail part of the rotary kiln.
9. The method for processing oily waste by strengthening oxidative roasting of neodymium iron boron alloy according to claim 8, characterized in that in step 3 and step 4, the feeding speed, the aeration flow and the rotary furnace rotating speed are adjusted by observing the dust distribution in the rotary furnace body (1) through video, so that the oxidative roasting of the oily waste in the furnace is efficiently carried out.
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| CN202110598429.5A CN113357907A (en) | 2021-05-31 | 2021-05-31 | Rotary furnace device and method for processing oily waste by roasting neodymium iron boron alloy through enhanced oxidation |
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| CN115011793A (en) * | 2022-06-01 | 2022-09-06 | 吉水金诚新材料加工有限公司 | Low-temperature oxidation process and low-temperature oxidation kiln thereof |
| CN115449627A (en) * | 2022-10-13 | 2022-12-09 | 中国科学院赣江创新研究院 | Method for oxidizing and roasting neodymium iron boron waste |
| CN115451693A (en) * | 2022-09-19 | 2022-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium slag oxidizing roasting rotary kiln and use method thereof |
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