CN110614377A - Production process for preparing copper powder by using SCR (Selective catalytic reduction) shaft furnace system - Google Patents
Production process for preparing copper powder by using SCR (Selective catalytic reduction) shaft furnace system Download PDFInfo
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- CN110614377A CN110614377A CN201911050661.4A CN201911050661A CN110614377A CN 110614377 A CN110614377 A CN 110614377A CN 201911050661 A CN201911050661 A CN 201911050661A CN 110614377 A CN110614377 A CN 110614377A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
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Abstract
The invention discloses a production process for preparing copper powder by using an SCR (selective catalytic reduction) shaft furnace system, belonging to the field of copper processing and powder metallurgy industry, and the production process for preparing copper powder by using the SCR shaft furnace system comprises the following steps: firstly, adding a copper raw material into an SCR shaft furnace to be heated into molten copper; secondly, molten copper liquid flowing out of the shaft furnace is shunted to a sub-chute through an upper chute, a slag box, a rotary holding furnace and a lower chute, the copper liquid is drained to a crucible pouring pool through the sub-chute and then enters a high-pressure water atomizer, and copper liquid metal is directly crushed into fine liquid drops and is rapidly cooled into copper powder to enter an atomizing tank; and thirdly, filtering the mixture of the copper powder and water, dropping the mixture into a copper powder transfer tank, and dehydrating and drying the mixture to obtain the copper powder. The invention organically combines the prior SCR shaft furnace production process and the copper powder preparation process, can realize two purposes, simultaneously and continuously produce the copper rod and prepare the copper powder, and has reasonable production process, simple and easy operation, high equipment utilization rate and good stability.
Description
Technical Field
The invention relates to the field of copper processing and powder metallurgy industries, in particular to a production process for preparing copper powder by using an SCR (selective catalytic reduction) shaft furnace system.
Background
At present, 50% of copper rods in the world are produced by adopting south line SCR technology, and the American SoUTHWIRE company provides 70 SCR systems all over the world, the equipment level of the SCR systems is advanced in the world, the process is mature, the product quality is excellent and stable, 10 SCR systems are introduced only in China, the capacity of bright copper rods exceeds 600 ten thousand t/a, and some new production lines are used in the beginning in succession, and the SCR continuous casting and rolling copper rod technology and the machine line become the leading method for producing copper wire blanks. The basic process flow is as follows: charging hoist → shaft furnace → upper chute → slag box → rotary holding furnace → lower chute → tundish → five-wheel steel strip casting machine → rotary shear → preconditioner → roughing mill group → finishing mill group → acid-free treatment device → defect detector → curling pinch roll → wax spray device → curling packing device. The copper melting capacity of the production line is more surplus, and the surplus capacity can be used for producing copper powder through drainage, so that the comprehensive efficiency and scale benefit of the production line are fully embodied and exerted. The existing copper powder preparation process flow is generally as follows: smelting in an intermediate frequency furnace or a power frequency furnace → casting ladle → crucible pouring → high-pressure pump atomization → automatic centrifugal discharge → screening → inspection → bulk storage → packaging.
The existing copper melting furnace for preparing copper powder basically adopts an intermediate frequency furnace or a power frequency furnace, is difficult to produce continuously, has low productivity, low thermal efficiency and large energy consumption, and has no precedent for preparing copper powder by an SCR (selective catalytic reduction) shaft furnace system at home and abroad.
In the prior art, the yield of the copper powder produced independently is small, the economic benefit is not large, small enterprises are not enough in the production of the copper powder by using the shaft furnace, large enterprises produce the copper powder independently because the land occupation is large, the cost is high, the economic benefit is not large and cannot be realized, and the market demand of the copper powder is not large and stable, so that the copper powder prepared by using the SCR continuous casting and rolling shaft furnace is difficult to think.
With the rapid development of copper processing technology towards high efficiency, energy conservation, environmental protection, automation and serialization, research on a brand-new SCR shaft furnace system for preparing copper powder and a production process and industrialization research thereof is imperative.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to solve the technical problem of providing a production process for preparing copper powder by using an SCR shaft furnace system, solve the problems of the prior art, fully utilize the SCR shaft furnace system to prepare the copper powder, organically combine the existing SCR shaft furnace production process with the copper powder preparation process, realize two purposes of one machine, continuously produce copper rods and prepare the copper powder simultaneously, have reasonable and flexible production process, simple and easy operation, high equipment utilization rate and good stability, prepare the copper powder by using the SCR continuous casting and rolling shaft furnace, and directly shunt copper liquid in the copper rod production process to prepare the copper powder. In the prior art, copper wires are additionally purchased as raw materials for copper foil company, equipment facilities such as a melting tank and the like are additionally added in the process, the occupied area is large, and the mobile capital is large.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process for preparing copper powder by using an SCR shaft furnace system is characterized by comprising the following steps: which comprises the following steps:
firstly, when a copper rod is produced on an SCR continuous casting and rolling production line, adding a copper raw material into a charging elevator, and heating the copper raw material into an SCR shaft furnace from the charging elevator to form molten copper;
secondly, molten copper liquid flowing out of the shaft furnace passes through an upper chute, a slag box, a rotary holding furnace and a lower chute and is divided into partial chutes, the molten copper liquid is guided to a crucible pouring pool by the partial chutes, the molten copper liquid in the crucible pouring pool automatically enters a high-pressure water atomizer, the liquid flow is crushed by means of the impact of high-pressure water flow, namely water atomization, the copper liquid metal is directly crushed into fine liquid drops and rapidly cooled into copper powder to enter an atomization tank;
and thirdly, filtering the mixture of the copper powder and water through a stainless steel screen, performing vacuum suction filtration dehydration, and performing steam drying to obtain the copper powder.
As a further improvement of the scheme, the lower chute is provided with a collector, and one side of the collector is provided with an overflow hole which can divide the copper liquid into the sub-chutes.
As a further improvement of the scheme, the lower chute is provided with a flow blocking connecting rod, the flow blocking connecting rod is provided with an electric control device, and the electric control device can accurately control the position of the flow blocking connecting rod, so that the stability of the liquid level of the copper water in the collector is kept, and the sufficient flow of the shunted copper water is ensured.
As a further improvement of this solution, the rotary holding furnace is tilted to keep the copper level inside the downcomer collector stable.
As a further improvement of the scheme, the slag box is utilized for conducting copper liquid diversion, slag removal, temperature adjustment and oxygen content adjustment; the temperature in the lower chute device is adjusted by controlling the air-fuel ratio, so that the temperature of the copper liquid can be increased, oxygen can be increased, and energy can be saved, wherein the temperature of the copper liquid is 1115-1125 ℃.
As a further improvement of the scheme, the atomization form of the high-pressure water atomizer adopts V-shaped injection; the included angle between the water and the copper metal liquid is 30-36 degrees; the high-pressure water pressure is 19MPa at most.
As a further improvement of the scheme, the SCR shaft furnace system is provided with a vacuum belt filter, the vacuum belt filter is used for dehydration to realize the separation of copper powder and water, and the filtered water is returned to the system for recycling.
A stainless steel screen is arranged below a discharge port of the atomizing cylinder, unqualified products are filtered out, and qualified products are guaranteed to enter the next procedure; in order to ensure the normal operation of equipment such as a water pump, an atomizing nozzle and the like, a circulating water multi-stage filtering and purifying device is required to be added.
The invention has the beneficial effects that:
the production process for preparing the copper powder by using the SCR shaft furnace system and the SCR shaft furnace system are fully utilized to prepare the copper powder, the existing SCR shaft furnace production process and the copper powder preparation process are organically combined, the dual purposes of one machine can be realized, the copper rod and the copper powder can be continuously produced, and the production process is reasonable, simple and easy to operate, high in equipment utilization rate and good in stability.
The invention uses the SCR continuous casting and rolling shaft furnace to prepare the copper powder, directly shunts the copper liquid in the production process of the copper rod, can save the investment of equipment and facilities such as a melting tank, and the like, and singly manufactures the copper powder and needs to buy copper wires, and the process needs to add basic facilities such as a melting tank and the like, occupies more land and occupies large mobile funds; the system of the invention simplifies the process flow and saves the cost of land acquisition cost, supporting equipment and facility cost, labor wages, energy consumption cost and the like.
Drawings
FIG. 1 is a schematic flow diagram of a process for producing copper powder using an SCR shaft furnace system according to an embodiment of the present invention.
FIG. 2 is yet another schematic diagram of a process flow for producing copper powder using an SCR shaft furnace system provided in an embodiment of the present invention.
Fig. 3 is a schematic diagram of a system for preparing copper powder by using an SCR continuous casting and rolling shaft furnace according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view a-a of a system for producing copper powder using an SCR continuous casting and rolling shaft furnace according to an embodiment of the present invention.
Fig. 5 is a schematic B-B cross-sectional view of a system for producing copper powder using an SCR continuous casting and rolling shaft furnace according to an embodiment of the present invention.
Fig. 6 is a schematic view of a section a-a of the rear side of a system for producing copper powder using an SCR continuous casting and rolling shaft furnace according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of the other side of the upper half of the system for preparing copper powder by using the SCR continuous casting and rolling shaft furnace, cut away from a-a, according to an embodiment of the present invention.
FIG. 8 is a schematic plan view of a vacuum belt filter of a system for producing copper powder using an SCR continuous casting and rolling shaft furnace according to an embodiment of the present invention.
Wherein: 1. a double-paddle dryer; 2. a holding furnace; 3. a chute is arranged; 4. a high pressure water atomizer; 5. a vacuum belt filter; 6. a heat-insulating burner; 7. an electric hoist; 8. a feeding bin; 9. a copper powder transfer groove; 10. a fan; 11. a copper powder transfer pump; 12. a shaft furnace; 13. a rotary holding furnace; 15. a control room; 17. a dry copper powder stacking and packaging area; 18. a vacuum filter water tank; 19. a water tank base; 20. a water channel professional circulating water pump; 21. a buffer water tank.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the production process for preparing copper powder by using the SCR shaft furnace system provided in this embodiment includes the following steps: firstly, when the SCR continuous casting and rolling production line produces copper rods, adding copper raw materials into a charging lifter, and heating the copper raw materials into an SCR shaft furnace 12 from the charging lifter into molten copper; secondly, molten copper liquid flowing out of the shaft furnace 12 passes through an upper chute, a slag box, a rotary holding furnace 13 and a lower chute 3 and is divided into sub-chutes, the sub-chutes guide the copper liquid to a crucible pouring pool, the copper liquid in the crucible pouring pool automatically enters a high-pressure water atomizer 4, the liquid flow is crushed by means of the impact of high-pressure water flow, namely water atomization, the copper liquid metal is directly crushed into fine liquid drops and rapidly cooled into copper powder to enter an atomization tank; filtering the mixture of the copper powder and water by a stainless steel screen mesh, conveying the copper powder by a transfer pump, dehydrating by a vacuum belt filter 5, and drying by a double-blade dryer 1 to obtain a copper powder product; the upper chute can ensure the continuous and stable pouring process, reduce the downtime, remove slag, control the liquid temperature and the oxygen content and improve the product quality; the slag box can be used for guiding the copper liquid, removing slag and adjusting the temperature and the oxygen content, and can completely meet the requirements of different smelting processes; the rotary holding furnace 13 can complete the processes of removing slag, adjusting oxygen, standing, adjusting copper liquid, adjusting pouring temperature and the like of the copper liquid; the rotary holding furnace 13 can control the flow speed and the flow quantity of the copper liquid by an electric control system, reduce the burning loss rate of the copper liquid and meet the requirements of producing copper rods and preparing copper powder simultaneously. The production process for preparing the copper powder by using the SCR continuous casting and rolling shaft furnace system provided by the invention fully utilizes the SCR continuous casting and rolling shaft furnace system to prepare the copper powder, organically combines the existing SCR shaft furnace production process and the copper powder preparation process, can realize two purposes by one machine, simultaneously and continuously produces the copper rod and the copper powder, and has the advantages of reasonable production process, simple and easy operation, high equipment utilization rate, good stability and high safety. The SCR continuous casting and rolling shaft furnace is used for preparing copper powder, copper liquid in the production process of a copper rod is directly shunted, the implementation investment of equipment such as a melting tank can be saved, copper wires need to be bought for manufacturing the copper powder independently, basic equipment such as the melting tank needs to be added in the process, the occupied area is large, and the occupied flowing fund is large; the system of the invention simplifies the process flow and saves the cost of land purchase cost, supporting equipment facility cost, labor wage, energy consumption cost and the like.
The invention can lead the molten copper liquid flowing out of the shaft furnace to flow through an upper chute, a slag box, a rotary holding furnace 13 and a lower chute 3 and then to be divided into a sub-chute, the sub-chute leads the copper liquid to a crucible casting pool, the copper liquid in the crucible casting pool automatically enters a high-pressure water atomizer 4, the liquid flow is crushed by the impact of high-pressure water flow, the copper liquid can be directly crushed into countless small monomer metal droplets, the droplets are rapidly cooled in an atomizing tank to form copper powder, the mixture of the copper powder and water is filtered out of unqualified products by a stainless steel screen mesh and enters a copper powder transfer tank, then the copper powder and the water are separated by a vacuum belt filter, the copper powder products are obtained after the mixture is dried by a double-blade steam dryer, and the filtered water is returned to. The production process for preparing copper powder by using the SCR shaft furnace system increases the product types, and adds copper powder products on the basis of copper rod products; secondly, the production line has stable process, and the safety and the reliability of the copper powder produced by the shaft furnace are high; thirdly, the copper rod and the copper powder can be produced simultaneously, the utilization rate of equipment is high, the comprehensive energy consumption cost is low, and the economic benefit is obvious.
The lower chute 3 is provided with a collector, one side of the collector is provided with an overflow hole, the copper liquid can be distributed to the sub-chute, and the sub-chute drains the copper liquid to the crucible pouring pool. The lower chute is provided with a flow blocking connecting rod,
the flow blocking connecting rod is provided with an electric control device, the electric control device can accurately control the position of the flow blocking connecting rod, the stability of the copper liquid level in the collector is kept, and the sufficient amount of copper liquid for shunting and supplying is guaranteed. The electric control device comprises a servo motor, a screw jack and a stopper rod, and the level of the copper liquid in the crucible pouring pool is monitored in real time through a monitoring system display screen; give down chute fender stream connecting rod electrically controlled device through monitored control system in good time and assign the instruction, can start servo motor, under the stable circumstances of package pouring in the middle of guaranteeing the back end, through the height of screw jack automatic control stopper stick position, and then the flow size of copper liquid in the chute collector under the control keeps the stability of copper liquid level, guarantees the copper liquid of reposition of redundant personnel supply capacity, realizes accurate control. The rotary holding furnace can control the flow speed and the flow quantity of the copper liquid by an electric control system, reduce the burning loss rate of the copper liquid and meet the requirements of producing copper rods and preparing copper powder simultaneously.
As a further improvement of this solution, the rotary holding furnace 13 is tilted to keep the copper level inside the collector of the lower chute 3 stable. The rotary holding furnace 13 completes the processes of deslagging, oxygen regulation, standing, copper liquid regulation and pouring temperature regulation of the copper liquid, and the rotary holding furnace 13 can control the flow speed and the flow rate of the copper liquid through an electric control system, so that the burning loss rate of the copper liquid is reduced, and the requirements of simultaneously producing copper rods and preparing copper powder are met. And carrying out copper liquid diversion, slag removal, temperature regulation and oxygen content regulation by using the slag box. Thus meeting the requirements of different smelting processes.
As a further improvement of the scheme, the temperature of the copper liquid in the lower chute 3 device is adjusted by controlling the air-fuel ratio, so that the temperature, oxygen enrichment and energy conservation of the copper liquid can be improved, and the temperature of the copper liquid is 1115-1125 ℃.
The high-pressure water atomization suction filter device can continuously prepare copper powder. As a further improvement of the scheme, the atomization form of the high-pressure water atomizer 4 is V-shaped injection; the included angle between the water and the copper metal liquid is 30-36 degrees. The atomizing medium may be another liquid than water. As a further improvement of the scheme, the high-pressure water pressure is up to 19 MPa. The copper metal liquid flow has short length (distance from the outlet to the atomizing focus) and proper spraying angle, can fully utilize the kinetic energy given to the copper metal liquid flow by the high-pressure water flow, and is beneficial to the atomizing process.
As a further improvement of the scheme, the SCR shaft furnace system is provided with a vacuum belt filter 5, the vacuum belt filter 5 is used for dehydration to realize the separation of copper powder and water, and the filtered water is returned to the system for recycling.
The system for preparing the copper powder by the SCR continuous casting and rolling shaft furnace used in the production process for preparing the copper powder by the SCR shaft furnace comprises a charging elevator, an SCR shaft furnace system and a copper powder preparation system, wherein the SCR shaft furnace system comprises a shaft furnace 12, an upper chute, a slag box, a rotary holding furnace 13 and a lower chute 3 which are sequentially communicated; the lower chute 3 is provided with a lower chute flow blocking rod, and an electric control device is additionally arranged on a lower chute flow blocking connecting rod to accurately control the position of the flow blocking connecting rod and ensure the stability of the copper liquid level in the collector; the chute is provided with the collector down, one side of collector sets up an overflow hole, shunts copper liquid to dividing the chute, copper powder preparation system still includes high pressure water atomizer 4, stainless steel screen cloth, copper powder transport groove, copper powder transfer pump, vacuum belt filter 5, two thick liquid leaf desiccators 1, copper liquid shunts to dividing the chute in the lower chute 3, by dividing the chute with copper liquid drainage to crucible pouring basin, copper liquid in the crucible pouring basin gets into high pressure water atomizer by oneself, come broken liquid stream with the help of the impact of high pressure rivers and atomize water, can be with the direct breakage of copper liquid metal for tiny liquid drop and cool off into in the copper powder gets into the atomizer rapidly, the mixture of copper powder and water filters through stainless steel screen cloth again, vacuum suction filtration dehydration, after the steam drying, can acquire the copper powder. The invention relates to an improved lower chute 3 of an SCR shaft furnace system, wherein one side of a collector of the lower chute is provided with an overflow hole for distributing copper liquid to a sub-chute; the lower chute flow blocking connecting rod is improved, an electric control device is additionally arranged to accurately control the position of the flow blocking connecting rod, the stability of the copper liquid level in the collector can be ensured, the enough flow of the divided copper liquid is kept, and the stability of the pouring liquid level can be realized by pouring personnel through tilting the rotary holding furnace 13; a sub-chute is newly added, and the copper liquid can be drained to a crucible pouring pool; the new high-pressure water atomizing and suction filtering device can continuously prepare the copper powder. The novel copper rod has the advantages of new product types on the basis of copper rods, reasonable production process, simple and easy operation, high equipment utilization rate, good stability, strong safety and reliability, low comprehensive energy consumption cost, remarkable social and economic benefits and great and profound significance.
FIG. 2 is another schematic diagram of an embodiment of the present invention, in which the detailed process of the copper liquid treatment can be seen, after the copper liquid is atomized by high pressure water, the copper liquid is filtered by a screen and filtered in vacuum to obtain wet copper powder and filtrate, the wet copper powder is dried by a paddle to obtain copper powder and tail gas, the tail gas and the high pressure atomized tail gas are treated by wet dust removal, and the copper powder is sent to a finished product warehouse. The filtrate after vacuum filtration can also be added with water to a high-pressure atomizer for high-pressure water atomization and circulation treatment, thereby saving energy.
The invention relates to a production process for preparing copper powder by using an SCR (selective catalytic reduction) shaft furnace system, which comprises a charging elevator, the SCR continuous casting and rolling shaft furnace system and a copper powder preparation system, wherein the SCR continuous casting and rolling shaft furnace system comprises a shaft furnace 12, an upper chute, a slag box, a rotary holding furnace 13 and a lower chute 3 which are sequentially communicated; the lower chute 3 is provided with a lower chute 3 flow blocking rod, and a new electric control device is added to the lower chute 3 flow blocking connecting rod to accurately control the position of the flow blocking connecting rod and ensure the stability of the liquid level of the copper liquid in the collector; in order to facilitate control, a control chamber 15 can be arranged for control, the lower chute 3 is provided with a collector, one side of the collector is provided with an overflow hole, copper liquid is divided to a sub-chute and is drained to a crucible casting pool by the sub-chute, the system for preparing copper powder by the SCR continuous casting and rolling shaft furnace further comprises a high-pressure water atomizer 4, a stainless steel screen and a copper powder transfer groove 9, the copper liquid in the crucible casting pool automatically enters the high-pressure water atomizer 4, the liquid flow is crushed by the impact of high-pressure water flow, namely water atomization, the copper liquid metal can be directly crushed into fine liquid drops and rapidly cooled into copper powder to enter an atomization tank, the copper powder transfer groove 9 is connected below the high-pressure water atomizer 4, and the mixture of the copper powder and water is filtered by the stainless steel screen, conveyed by a copper powder transfer pump 11, dehydrated by a vacuum belt filter 5 and dried by a double-blade dryer 1, and obtaining copper powder. The copper powder is placed in a dry copper powder stacking and packaging area 17 and then packaged by a packaging barrel, and finished products are stored. The system for preparing the copper powder by using the SCR continuous casting and rolling shaft furnace provided by the invention fully utilizes the SCR continuous casting and rolling shaft furnace system to prepare the copper powder, organically combines the existing SCR shaft furnace production process and the copper powder preparation process, can realize two purposes, simultaneously and continuously produces the copper rod and the copper powder, and has the advantages of reasonable production process, simple and easy operation, high equipment utilization rate, good stability and high safety. The vacuum belt filter is also provided with a vacuum filter water tank 18 and a water tank base 19. The invention relates to a system for preparing copper powder by using an SCR (selective catalytic reduction) continuous casting and rolling shaft furnace, which is characterized in that a lower chute 3 is improved, one side of a collector of the lower chute is provided with an overflow hole, copper liquid is divided into sub-chutes, and the sub-chutes drain the copper liquid to a crucible pouring pool; the lower chute 3 is improved with a flow blocking connecting rod, an electric control device is added to accurately control the position of the flow blocking connecting rod, the stability of the copper liquid level in the collector can be ensured, the enough flow of the divided copper liquid is kept, and the stability of the pouring liquid level can be realized by pouring personnel through tilting the rotary holding furnace 13; the new high-pressure water atomizing and suction filtering device can continuously prepare the copper powder. The invention has the beneficial effects that: the novel copper rod has the advantages of new product types on the basis of the copper rod, reasonable production process, simple and easy operation, high equipment utilization rate, good stability, strong safety and reliability, low comprehensive energy consumption cost, remarkable social and economic benefits and great and profound significance.
The lower chute 3 is provided with a flow blocking connecting rod, the flow blocking connecting rod is provided with an electric control device, the electric control device can accurately control the position of the flow blocking connecting rod, the stability of the copper liquid level in the collector is kept, and the sufficient flow of the divided copper liquid is ensured. Thus, the quality of the copper liquid is ensured, and the continuity of the next copper powder preparation and the product quality are ensured. The system for preparing the copper powder by the SCR continuous casting and rolling shaft furnace is provided with a vacuum belt filter 5, the vacuum belt filter 5 is used for dehydration to realize the separation of the copper powder and water, and the filtered water is returned to the system for recycling. Still set up circulating water multi-stage filtration purifier, the drainage passes through circulating water equipment cyclic utilization, can guarantee equipment such as water pump, atomizing nozzle better operation. A stainless steel screen capable of filtering out unqualified products is arranged below the discharge hole of the atomizing cylinder, so that qualified products can enter the next procedure.
The invention starts from the existing lower chute 3 of the SCR system, comprises the steps of reconstructing the lower chute 3 and newly building a set of copper powder preparation system and related public and auxiliary facilities, and the heat preservation furnace 2 is provided with a high-temperature burning nozzle 6 below the lower chute 3. And an electric hoist 7 is also arranged so as to overhaul and hoist objects in normal times. The copper powder preparation process flow mainly comprises two major systems of copper powder preparation and copper powder drying, wherein the copper powder preparation system is connected with a section of copper liquid distribution chute from a lower chute 3 of an SCR4500, the copper liquid is guided to a holding furnace 2 through the distribution chute, the flow is regulated through a crucible in the holding furnace 2, the copper liquid is quenched into the copper powder through high-pressure water after entering an atomizing nozzle, the copper powder is collected through an atomizing cylinder, filtered through a stainless steel screen mesh and falls into a copper powder transfer groove 9, and then conveyed to a vacuum belt type filter 5 through a copper powder transfer pump 11 for copper liquid separation, the filtered copper powder is conveyed to a slurry dryer feeding bin 8, the filtrate flows into a buffer water tank 21, and is conveyed to a circulating water tank through a water channel professional circulating pump 20 for cyclic utilization. The steam produced in the copper liquid atomization process is led to the outdoor for emptying through a fan 10.
The copper powder drying system deeply dries copper powder by using a double-paddle steam dryer, the steam pressure is 0.4MP, and the water content of the dried copper powder is controlled to be less than 1%. Copper powder enters the double-paddle dryer 1 through the feeding bin 8 on the upper portion of the dryer and the lower screw feeder, steam is introduced for heat exchange, the produced copper powder is packed by the packing barrel and then sent to a finished product warehouse for temporary storage, and the copper powder is transported to a copper foil company by an automobile to serve as a production raw material. And the dried and output smoke is conveyed to an outdoor wet dust collector through a draught fan to be treated and then is discharged after reaching the standard. According to the copper powder drying system, the feeding screw of the double-blade steam dryer is cancelled, the transfer bin at the discharge end of the vacuum belt dryer is changed into the discharging hopper, copper powder is directly added into the double-blade steam dryer through the discharging hopper, the intermediate material transfer is reduced, and the overall workshop height of a workshop is reduced.
The invention organically combines the prior SCR4500 shaft furnace system with the copper powder preparation system to realize continuous production of copper rods and preparation of copper powder, and has the following characteristics: the process flow is continuous, the copper liquid is continuously drained to the copper powder atomizing nozzle through the transformation of the existing chute 3, the copper powder can be continuously produced, and the adverse effect on the copper rod production line of the existing SCR4500 shaft furnace system is avoided. And secondly, energy conservation and consumption reduction are realized, the copper liquid produced by the SCR4500 shaft furnace system is used for preparing copper powder, an intermediate frequency furnace or a power frequency furnace is not needed to be independently arranged for melting copper, the process flow is shortened, the energy consumption is saved, and the production cost for preparing the copper powder is reduced. The produced copper powder is used for the leaching process of a copper foil workshop, the requirement on the granularity of the copper powder is not high, the granularity of the copper powder can only reach 40-60 meshes, if ultrahigh pressure water atomization is adopted, the granularity of the copper powder can generally reach about 200 meshes, but the energy consumption of a high-pressure water pump is high, the production cost is high, and the production process of the copper powder with the proper granularity aims to produce the copper powder by reducing the water pressure of an atomization nozzle and controlling the copper-liquid ratio, so that the requirements of the subsequent process can be met, and the purpose of energy saving can be.
The production process for preparing copper powder by using the SCR shaft furnace system can fully utilize the existing equipment of the SCR furnace zone system for technical transformation, only needs to add a small number of additional equipment on the basis, can coil equipment, improve the utilization rate of the equipment and the utilization rate of energy, can save the purchase fund of the equipment, reduce the energy consumption cost and increase the product types.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (10)
1. The production process for preparing copper powder by using the SCR shaft furnace system is characterized by comprising the following steps of: which comprises the following steps:
when the SCR continuous casting and rolling production line produces the copper rod, adding the copper raw material into a charging elevator, and heating the copper raw material into an SCR shaft furnace from the charging elevator to form molten copper;
molten copper liquid flowing out of the shaft furnace is sequentially shunted to a sub-chute through an upper chute, a slag box, a rotary holding furnace and a lower chute, the copper liquid is drained to a crucible pouring pool through the sub-chute,
the copper liquid in the crucible pouring pool enters a high-pressure water atomizer, the liquid flow is crushed by the impact of high-pressure water flow to finish water atomization, and the copper liquid metal is directly crushed into fine liquid drops and rapidly cooled into copper powder to enter an atomization tank;
and dehydrating and drying the mixture of the copper powder and water to obtain the dried copper powder.
2. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: the lower chute is provided with a collector, one side of the collector is provided with an overflow hole, the overflow hole can divide the copper liquid into the branch chutes, and the branch chutes drain the copper liquid into the crucible casting pool.
3. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: the lower chute is provided with a flow blocking connecting rod, the flow blocking connecting rod is provided with an electric control device, the electric control device can accurately control the position of the flow blocking connecting rod, the stability of the liquid level of the copper liquid in the collector is kept, and the sufficient amount of the copper liquid for shunting and supplying can be guaranteed.
4. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: and tilting the rotary holding furnace to keep the copper liquid level in the collector of the lower chute stable.
5. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: carrying out copper liquid diversion, slag removal and temperature and oxygen content adjustment by using the slag box; the temperature in the downcomer means is adjusted by controlling the air-fuel ratio.
6. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: the atomization form of the high-pressure water atomizer is V-shaped injection; the included angle between the water and the copper metal liquid flow is 30-36 degrees, and the high-pressure water pressure is 10-14 MPa.
7. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: the SCR shaft furnace system is provided with a vacuum belt filter, and the separation of copper powder and water is realized through the dehydration of the vacuum belt filter.
8. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: and a circulating water multi-stage filtering and purifying device is arranged, and filtered water is recycled through circulating water equipment.
9. The process for the production of copper powder using an SCR shaft furnace system of claim 1, wherein: the dryer is a double-blade steam dryer, and external steam is used as a drying heat source of the double-blade steam dryer.
10. The process for the production of copper powder using an SCR shaft furnace system of claim 7, wherein: the screen cloth that can filter out unqualified product is equipped with below atomizing drum discharge gate, still sets up the copper powder transfer pump, and the mixture of copper powder and water is filtered through the screen cloth, the copper powder transfer pump is delivered to vacuum belt filter and is dehydrated.
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| CN111922352A (en) * | 2020-07-27 | 2020-11-13 | 安徽旭晶粉体新材料科技有限公司 | Efficient preparation device and preparation method of spherical copper alloy powder |
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