CN220335267U - Pilot-scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust - Google Patents
Pilot-scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust Download PDFInfo
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- CN220335267U CN220335267U CN202321773365.9U CN202321773365U CN220335267U CN 220335267 U CN220335267 U CN 220335267U CN 202321773365 U CN202321773365 U CN 202321773365U CN 220335267 U CN220335267 U CN 220335267U
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- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 31
- 239000011701 zinc Substances 0.000 title claims abstract description 31
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000000428 dust Substances 0.000 title claims abstract description 28
- 229940062993 ferrous oxalate Drugs 0.000 title claims abstract description 26
- OWZIYWAUNZMLRT-UHFFFAOYSA-L iron(2+);oxalate Chemical compound [Fe+2].[O-]C(=O)C([O-])=O OWZIYWAUNZMLRT-UHFFFAOYSA-L 0.000 title claims abstract description 26
- 238000011020 pilot scale process Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000002386 leaching Methods 0.000 claims abstract description 57
- 238000002156 mixing Methods 0.000 claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000005485 electric heating Methods 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims description 50
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 239000002562 thickening agent Substances 0.000 claims description 43
- 238000003756 stirring Methods 0.000 claims description 37
- 238000001914 filtration Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 235000006408 oxalic acid Nutrition 0.000 claims description 15
- 238000000108 ultra-filtration Methods 0.000 claims description 14
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 239000008236 heating water Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
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- 238000005260 corrosion Methods 0.000 claims description 7
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- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 6
- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims 3
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 abstract description 13
- 238000004064 recycling Methods 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 21
- 230000008569 process Effects 0.000 description 18
- 239000000047 product Substances 0.000 description 11
- 239000006228 supernatant Substances 0.000 description 11
- 239000002910 solid waste Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052745 lead Inorganic materials 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
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- WYEMLYFITZORAB-UHFFFAOYSA-N boscalid Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC=C1NC(=O)C1=CC=CN=C1Cl WYEMLYFITZORAB-UHFFFAOYSA-N 0.000 description 1
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- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model discloses a pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, and relates to the field of chemical reaction equipment. The utility model comprises an electric heating system, a pulp mixing system, a wet leaching reaction system, a solid-liquid separation system, a filter pressing system, a leaching liquid purifying system and a tail liquid collecting system. The utility model solves the problems of complex operation, low recovery rate of valuable elements and difficult acquisition of high value-added products in the prior art, can lead the systems to be separated independently and be regularly combined together, can adopt soft pipelines or quick-plug connectors for connection between different systems, has simple setting operation and high working efficiency, can be flexibly combined, can rapidly and efficiently finish the separation treatment and the recycling utilization of iron and zinc resources in the electric furnace dust, has high resource utilization rate, and further prepares the high value-added products.
Description
Technical Field
The utility model relates to the field of chemical reaction equipment, in particular to a pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust.
Background
Iron and steel enterprises can generate a large amount of iron-containing solid wastes in normal production and operation activities. Taking electric furnace dust removal as an example, the annual production amount is about 400 ten thousand tons, the Zn and Pb contents are high, the electric furnace dust removal is a typical bulk hazardous waste in the steel industry, the accumulation amount of other iron-rich solid waste such as blast furnace gas mud, converter OG mud and the like reaches nearly ten thousand tons, and the conventional production and operation activities of enterprises are seriously affected. At present, the treatment mode of the iron-containing dust mud mainly comprises the following steps: self-recycling, stockpiling or landfill disposal and external commission disposal inside enterprises.
The chemical industry pilot scale platform device with the publication number of CN108355602B and the working method thereof are disclosed, chemical raw materials are firstly injected into a charging unit, and the feeding of the materials is finally realized through the transverse movement of the upper cover of the reaction kettle, but the patent cannot control the feeding speed and does not relate to a subsequent filtering and pressure filtering unit;
a pilot scale system for preparing boscalid intermediate with publication number of CN206298532U is provided with real-time temperature regulating equipment, an accuracy measuring device, a stability measuring device and the like, and can realize various synthetic reactions such as acidification reaction and the like in a reaction kettle, but the pilot scale system does not relate to a product collecting system, a reaction waste collecting system and a wastewater disposal system, and cannot meet the actual requirements of a wet process full-flow process.
However, the problems of small equipment scale, long process flow and complex operation, which commonly exist in the existing electric furnace dust removal ash comprehensive utilization technology and equipment, still exist in the practical and practical process, so that the recovery rate of valuable elements is low, and further, high value-added products are difficult to obtain; therefore, the prior requirements are not met, and a pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust is provided.
Disclosure of Invention
The utility model aims to provide a pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, which has the characteristic of carrying out full-flow resource utilization on various iron-rich solid waste raw materials, and solves the problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a pilot scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust-removing ash comprises an electric heating system, a slurry mixing system, a wet leaching reaction system, a solid-liquid separation system, a filter pressing system, a leaching liquid purifying system and a tail liquid collecting system, wherein the electric heating system comprises an electric heating water tank and an electric heating electrode; the slurry mixing system comprises a slurry mixing kettle A, a stirring shaft, stirring blades, a direct current motor and a slurry mixing kettle B; the wet leaching reaction system comprises a stirring shaft, stirring blades, a direct current motor, a leaching kettle A and a leaching kettle B; the solid-liquid separation system comprises a stirring shaft, stirring blades, a direct current motor, a thickener A, a thickener B, a screw pump and a water purifier, wherein a raw water inlet is formed in the water purifier; the filter pressing system comprises a filter press A and a filter press B; the leaching liquid purifying system comprises a filtering device and an ultrafiltration device; the tail liquid collecting system comprises an accident liquid storage tank and a lean liquid tank A.
Preferably, the electric heating system, the pulp mixing system, the wet leaching reaction system, the solid-liquid separation system, the filter pressing system, the leaching liquid purifying system and the tail liquid collecting system are connected by utilizing a soft connection and a quick plug-in connector.
Preferably, the thickener A and the thickener B are respectively provided with a mud scraping blade and a fixing ring, and the fixing rings are used for fixing the mud scraping blade; the filter press A and the filter press B are respectively provided with a conveying belt, a pressing plate, a material temporary storage frame and a slurry conveying pipeline, one end of the filter press A is connected with a zinc-rich slag material box, and one end of the filter press B is connected with a ferrous oxalate material box; the filter equipment and the thickener B are connected with an intermediate water tank A, the ultrafiltration equipment and the thickener A are connected with an intermediate water tank B, and the other end of the ultrafiltration equipment is connected with a lean solution tank B; a horizontal bidirectional screw conveyor is arranged between the slurry mixing kettle A and the slurry mixing kettle B, an inclined screw conveyor is arranged on the horizontal bidirectional screw conveyor, and one end of the inclined screw conveyor is provided with an electric furnace dust removing bin, an oxalic acid bin and a metal iron powder bin.
Preferably, the size mixing kettle A, the size mixing kettle B, the leaching kettle A, the leaching kettle B, the thickener A and the thickener B are respectively provided with a cat ladder and a detachable guardrail, and visible mirror openings are arranged at different positions of the thickener A and the thickener B.
Preferably, the lift of the screw pump is 10-12 m, and the flow is 10-12 m 3 /h。
Preferably, the treatment flow rate of the filtering device and the ultrafiltration device is more than 6m 3 And/h, and adopting polytetrafluoroethylene filtering membranes.
Preferably, the stock of the electric furnace dedusting ash bin, the oxalic acid bin and the metal iron powder bin is more than 2 tons, special thermometers are arranged in the lean solution box A and the lean solution box B, the outside of the lean solution box A and the lean solution box B is made of carbon steel, and the inside of the lean solution box A and the lean solution box B is a vinyl resin anti-corrosion lining.
Preferably, the electric heating water tank is made of titanium pipe material, and the size mixing kettle A and the size mixing kettle are made of titanium pipe materialThe slurry kettle B, the leaching kettle A and the leaching kettle B are both provided with variable frequency mixers, and the treatment capacity of the water purifier is not less than 1m 3 The water purifier comprises a sand filter with the diameter not smaller than 400mm, activated carbon and a volume larger than 2m 3 Is a raw water tank of the water pump.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model is composed of a plurality of secondary subsystems of an electric heating system, a pulp mixing system, a wet leaching reaction system, a solid-liquid separation system, a filter pressing system, a leaching liquid purifying system and a tail liquid collecting system, wherein the systems are separately and regularly combined together, and different systems can be connected by adopting soft pipelines or quick-plug connectors, so that the operation is simple and the working efficiency is high.
2. According to the technology and pilot test equipment provided by the utility model, the recycling of the leached tail liquid can be realized, the treatment cost of the leached tail liquid can be reduced by more than 50%, the whole process flow is near zero emission, and the environment-friendly requirement is met.
3. The pilot test platform device has low cost, can rapidly and efficiently finish separation treatment and recycling utilization of iron resources in iron-rich solid waste, and simultaneously realize effective enrichment of valuable elements such as zinc, copper and the like in the treatment process, so that the valuable elements can be recycled for secondary use, waste of the valuable elements is effectively avoided, the resource utilization rate is high, and compared with the conventional technology and equipment for recycling utilization of electric furnace dust, the element utilization rate is improved by 20-25%.
4. The pilot test equipment provided by the pilot test platform device can obtain two products with high added value, namely zinc-rich slag and ferrous oxalate, wherein the grade of zinc in the zinc-rich slag can be improved to more than 35% from 15% in raw ore, zinc-containing hazardous waste of electric furnace dust is thoroughly changed into zinc-rich resources, the purity of the other product ferrous oxalate can reach more than 98%, the high added value utilization of iron resources is truly realized, and the total recovery rate of Fe and Zn resources can reach more than 90%.
5. The utility model can feed various iron-rich solid wastes with different types, can overcome the difference of physicochemical properties of different solid waste raw materials, and can independently adjust the equipment operation parameters of each operation unit according to actual requirements, thereby meeting the requirements of different experiment types, different reaction parameters and different process flows, and having better raw material adaptability.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present utility model.
In the figure: 1. a screw pump; 2. a water purifier; 3. an electric heating water tank; 4. an electrically heated electrode; 5. a raw water inlet; 6. a sizing mixing kettle A; 7. a stirring shaft; 8. stirring blades; 9. a DC motor; 10. leaching kettle A; 11. mud scraping blades; 12. a thickener A; 13. a fixing ring; 14. a conveyor belt; 15. a pressing plate; 16. a filter press A; 17. a material temporary storage frame; 18. a slurry transport conduit; 19. a zinc-rich slag feed box; 20. a ferrous oxalate bin; 21. a sizing mixing kettle B; 22. leaching kettle B; 23. a thickener B; 24. a filter press B; 25. an accident liquid storage pool; 26. an intermediate water tank A; 27. an intermediate water tank B; 28. a filtering device; 29. an ultrafiltration device; 30. a lean solution tank A; 31. a lean solution tank B; 32. an electric furnace dedusting ash bin; 33. oxalic acid bin; 34. a metal iron powder bin; 35. an inclined screw conveyor; 36. a horizontal bidirectional screw conveyor.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to solve the technical problems that in the existing electric furnace dust removal comprehensive utilization technology and equipment, the ubiquitous equipment scale is small, the technological process is long, the operation is complex, the recovery rate of valuable elements is low, and further, high value-added products are difficult to obtain, referring to fig. 1, the embodiment provides the following technical scheme:
a pilot scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust-removing ash comprises an electric heating system, a slurry mixing system, a wet leaching reaction system, a solid-liquid separation system, a filter pressing system, a leaching liquid purifying system and a tail liquid collecting system, wherein the electric heating system comprises an electric heating water tank 3 and an electric heating electrode 4; the slurry mixing system comprises a slurry mixing kettle A6, a stirring shaft 7, stirring blades 8, a direct current motor 9 and a slurry mixing kettle B21; the wet leaching reaction system comprises a stirring shaft 7, stirring blades 8, a direct current motor 9, a leaching kettle A10 and a leaching kettle B22; the solid-liquid separation system comprises a stirring shaft 7, a stirring blade 8, a direct current motor 9, a thickener A12, a thickener B23, a screw pump 1 and a water purifier 2, wherein a raw water inlet 5 is arranged on the water purifier 2; the filter pressing system comprises a filter press A16 and a filter press B24; the leachate purification system comprises a filtration device 28 and an ultrafiltration device 29; the tail liquid collecting system comprises an accident liquid storage tank 25 and a lean liquid tank A30, and the systems are independently separated and regularly combined together, so that the requirements of different raw materials and different process flows can be met, the operation is simple and convenient, the added value of products is high, the recycling of tail liquid can be realized, and the purposes of near zero emission of the whole process flow and resource utilization of the whole process material are achieved.
Specifically, oxalic acid solid and deionized water heated by the electric heating water tank 3 are also injected into the slurry mixing kettle A6 according to a certain proportion, uniform slurry is formed and then pumped into the leaching kettle A10, meanwhile, the stirring shaft 7, the stirring blade 8 and the direct current motor 9 of the leaching kettle A10 are opened to stir and fully react the slurry in the leaching kettle A, and through the flow, fe in solid waste is reacted 3+ The complex reaction is carried out, zn and Pb are enriched in leaching residues at the lower part, a leaching residue pump is transferred to a filter press A16, and a pilot test product I, namely zinc-rich residues, is obtained after dehydration;
the iron powder, oxalic acid and supernatant obtained by solid-liquid separation in the previous step are conveyed into a slurry mixing kettle B21 through an inclined screw conveyor 35, stirred and mixed through a stirring shaft 7, a stirring blade 8 and a direct current motor 9 to form uniform slurry, the uniform slurry is conveyed into a leaching kettle B22, the slurry is stirred and subjected to hydrothermal reduction precipitation reaction through the leaching kettle B22, the reacted mixed slurry is pumped into a thickener B23 for solid-liquid separation, the slurry settled at the bottom is transferred to a filter press B24 through a screw pump 1, a product II, namely ferrous oxalate, is obtained after dehydration, the tail liquid is pumped into an intermediate water tank A26 for transition and short-time settlement, when the supernatant enters the intermediate water tank A26 to reach a certain liquid level, the supernatant is filtered through a filtering device 28, and the filtrate enters a lean liquid tank A30 for slurry mixing in a slurry mixing kettle A6, and finally the aim of near zero discharge of the tail liquid of the whole process is achieved.
The stirring shaft 7, the stirring blade 8 and the direct current motor 9 form a stirrer, the rotating speed adjustment range is 0-275 r/min, the diameter of the stirring shaft 7 is 70-80 mm, the diameter of the stirring blade 8 is 900mm, and the stirring shaft 7 and the stirring blade 8 are 304 stainless steel lining vinyl resin, so that corrosion can be prevented.
The electric heating system, the slurry mixing system, the wet leaching reaction system, the solid-liquid separation system, the filter pressing system, the leaching liquid purifying system and the tail liquid collecting system are connected by utilizing soft connection and quick-plug connectors, so that the systems are separated independently and are combined together regularly, flexible assembly among different systems can be realized, and the requirements of different raw materials and different process flows are met.
The thickener A12 and the thickener B23 are respectively provided with a mud scraping blade 11 and a fixing ring 13, and the fixing rings 13 are used for fixing the mud scraping blade 11; the filter press A16 and the filter press B24 are respectively provided with a conveying belt 14, a pressing plate 15, a material temporary storage frame 17 and a slurry conveying pipeline 18, one end of the filter press A16 is connected with a zinc-rich slag material box 19, and one end of the filter press B24 is connected with a ferrous oxalate material box 20; the filter device 28 and the thickener B23 are connected with an intermediate water tank A26, the ultrafiltration device 29 and the thickener A12 are connected with an intermediate water tank B27, and the other end of the ultrafiltration device 29 is connected with a lean solution tank B31; a horizontal bidirectional screw conveyer 36 is arranged between the size mixing kettle A6 and the size mixing kettle B21, an inclined screw conveyer 35 is arranged on the horizontal bidirectional screw conveyer 36, one end of the inclined screw conveyer 35 is provided with an electric furnace dust removing bin 33, an oxalic acid bin 32 and a metal iron powder bin 34, the size mixing kettle A6, the size mixing kettle B21, the leaching kettle A10, the leaching kettle B22, the thickener A12 and the thickener B23, the middle water tank A26, the middle water tank B27, the lean solution tank A30 and the lean solution tank B31 are all vinyl resin anti-corrosion linings, the thickness is 4-6 mm, and the long-term use under an acidic condition is realized.
The slurry mixing kettle A6, the slurry mixing kettle B21, the leaching kettle A10, the leaching kettle B22, the thickener A12 and the thickener B23 are respectively provided with a crawling ladder and a detachable guardrail, the pilot test platform device is provided with an operation platform with the height exceeding 1 meter, and different positions of the thickener A12 and the thickener B23 are provided with visible mirror openings.
Specifically, guardrails are fixed on two sides of the operation platform, and the thickener A12 and the thickener B23 can observe the sedimentation time and the sedimentation effect of reaction products in the thickener A12 and the thickener B23 through visible mirror openings, so as to determine whether to transfer supernatant liquid of the thickener A12 and the thickener B23 into the middle water tank A26 and the middle water tank B27.
The lift of the screw pump 1 is 10-12 m, and the flow is 10-12 m 3 /h。
The treatment flow rate of the filter device 28 and the ultrafiltration device 29 is greater than 6m 3 And/h, adopting polytetrafluoroethylene filtering membranes, wherein the filtering precision of the filtering membranes is less than 5 mu m.
The stock of the electric furnace dedusting ash bin 33, the oxalic acid bin 32 and the metal iron powder bin 34 is more than 2 tons, special thermometers are arranged in the lean solution box A30 and the lean solution box B31, the outside of the lean solution box A30 and the lean solution box B31 is made of carbon steel, and the inside is a vinyl resin anti-corrosion lining.
Specifically, the discharge ports of the electric furnace dedusting ash bin 33, the oxalic acid bin 32 and the metal iron powder bin 34 are controlled by flashboard, so that accurate discharging can be realized with the precision of +/-5%, the raw materials are put into the corresponding bins by means of the electric hoist and the portal frame, and the load of the electric hoist is 0.5-1 t; the setting of the thermometer can feed back the heating temperature of the leaching liquid in real time, and the temperature control range is 30-95 ℃; the lean solution tank A30 and the lean solution tank B31 adopt vinyl resin anti-corrosion lining, and can meet the requirements of acid resistance and corrosion resistance.
The electric heating water tank 3 is made of titanium pipe material, the size mixing kettle A6 and the size mixing kettle B21, and the leaching kettle A10 and the leaching kettle B22 are both provided with variable frequency mixers, and the treatment capacity of the water purifier 2 is not less than 1m 3 The water purifier 2 comprises a sand filter with the diameter not smaller than 400mm, activated carbon and a volume larger than 2m 3 The conductivity of the water quality treated by the water purifier 2 is less than 20 mu s/cm.
Working principle: transferring iron-rich solid wastes such as electric furnace dust and the like to a corresponding electric furnace dust bin 33, an oxalic acid bin 32 and a metal iron powder bin 34 by utilizing an electric hoist, then conveying the electric furnace dust to a slurry mixing kettle A6 by utilizing an inclined screw conveyor 35 and a horizontal bidirectional screw conveyor 36, and simultaneously, injecting oxalic acid solids and deionized water heated by a water purifier 2 and an electric heating water tank 3 into the slurry mixing kettle A6 according to a certain proportion, and mixing by utilizing a stirring shaft 7, stirring blades 8 and a direct current motor 9 to form uniform slurry;
the evenly mixed slurry is fully stirred and then is sent into a leaching kettle A10 through a screw pump 1, meanwhile, the slurry in the leaching kettle A10 is stirred and mixed by a stirring shaft 7, a stirring blade 8 and a direct current motor 9 which are opened, so as to form complex slurry, and Fe in the electric furnace dust is removed through the flow 3+ Complexing reaction is carried out to enter supernatant, zn and Pb are enriched into leaching residues at the lower part;
pumping the slurry in the leaching kettle A10 into a thickener A12 for solid-liquid separation, transferring the slurry settled at the bottom to a filter press A16 through a screw pump 1, dehydrating to obtain a pilot test product I, namely zinc-rich slag, pumping supernatant into an intermediate water tank B27 for transition and short-time sedimentation, filtering the supernatant by an ultrafiltration device 29 after the supernatant enters the intermediate water tank B27 to reach a certain liquid level, and recycling filtrate into a lean solution tank B31 for pulp mixing in a pulp mixing kettle B21;
after the filtrate is pumped into the slurry mixing kettle B21 to be used as a reactant for producing ferrous oxalate, the iron powder and oxalic acid are conveyed into the slurry mixing kettle B21 through the inclined screw conveyor 35 and the horizontal bidirectional screw conveyor 36; at this time, iron powder is used as a reducing agent, oxalic acid is used as an additive, and the iron powder, the stirring shaft 7, the stirring blades 8 and the direct current motor 9 are mixed to form uniform slurry; the stirred and mixed slurry is sent to a leaching kettle B22 through a screw pump 1, the slurry is stirred through a stirrer to carry out hydrothermal reduction precipitation reaction, through the process, iron-rich complex ions in the leaching solution undergo hydrothermal reduction complexation precipitation reaction to generate a product II, namely ferrous oxalate, and unreacted part of oxalic acid is reserved in supernatant fluid, and is filtered and circulated to the next process for re-reaction;
and pumping the slurry into a thickener B23 for solid-liquid separation, transferring the slurry settled at the bottom to a filter press B24 through a screw pump 1, dehydrating to obtain leached tail liquid and a product II, namely ferrous oxalate, pumping the tail liquid into an intermediate water tank A26 for transition and short-time sedimentation, filtering the supernatant liquid through a filtering device 28 after the supernatant liquid enters the intermediate water tank A26 to reach a certain liquid level, and recycling the filtrate into a lean solution tank A30 for slurry mixing in a slurry mixing kettle A6, thereby finally achieving the aim of near zero discharge of the tail liquid in the whole process.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A pilot scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust-removing ash comprises an electric heating system, a slurry mixing system, a wet leaching reaction system, a solid-liquid separation system, a filter pressing system, a leaching liquid purifying system and a tail liquid collecting system, and is characterized in that: the electric heating system comprises an electric heating water tank (3) and an electric heating electrode (4); the slurry mixing system comprises a slurry mixing kettle A (6), a stirring shaft (7), stirring blades (8), a direct current motor (9) and a slurry mixing kettle B (21); the wet leaching reaction system comprises a stirring shaft (7), stirring blades (8), a direct current motor (9), a leaching kettle A (10) and a leaching kettle B (22); the solid-liquid separation system comprises a stirring shaft (7), stirring blades (8), a direct current motor (9), a thickener A (12) and a thickener B (23), a screw pump (1) and a water purifier (2), wherein a raw water inlet (5) is formed in the water purifier (2); the filter pressing system comprises a filter press A (16) and a filter press B (24); the leaching solution purifying system comprises a filtering device (28) and an ultrafiltration device (29); the tail liquid collecting system comprises an accident liquid storage tank (25) and a lean liquid tank A (30).
2. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the electric heating system, the slurry mixing system, the wet leaching reaction system, the solid-liquid separation system, the filter pressing system, the leaching liquid purifying system and the tail liquid collecting system are connected by utilizing soft connection and quick-plug connectors.
3. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the thickener A (12) and the thickener B (23) are respectively provided with a mud scraping blade (11) and a fixed ring (13), and the fixed ring (13) is used for fixing the mud scraping blade (11); the filter press A (16) and the filter press B (24) are respectively provided with a conveying belt (14), a pressing plate (15), a material temporary storage frame (17) and a slurry conveying pipeline (18), one end of the filter press A (16) is connected with a zinc-rich slag material box (19), and one end of the filter press B (24) is connected with a ferrous oxalate material box (20); the filtering device (28) and the thickener B (23) are connected with an intermediate water tank A (26), the ultrafiltration device (29) and the thickener A (12) are connected with an intermediate water tank B (27), and the other end of the ultrafiltration device (29) is connected with a lean solution tank B (31); a horizontal bidirectional screw conveyor (36) is arranged between the slurry mixing kettle A (6) and the slurry mixing kettle B (21), an inclined screw conveyor (35) is arranged on the horizontal bidirectional screw conveyor (36), and an electric furnace dust removing bin (33), an oxalic acid bin (32) and a metal iron powder bin (34) are arranged at one end of the inclined screw conveyor (35).
4. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the pulping device is characterized in that a ladder stand and a detachable guardrail are arranged on the pulping kettle A (6), the pulping kettle B (21), the leaching kettle A (10), the leaching kettle B (22), the thickener A (12) and the thickener B (23), and visible mirror openings are arranged at different positions of the thickener A (12) and the thickener B (23).
5. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the lift of the screw pump (1) is 10-12 m, and the flow is 10-12 m 3 /h。
6. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the treatment flow rate of the filtering device (28) and the ultrafiltration device (29) is more than 6m 3 And/h, and adopting polytetrafluoroethylene filtering membranes.
7. A pilot scale platform for producing ferrous oxalate and zinc-rich slag from electric furnace dust according to claim 3, wherein: the electric furnace dedusting ash bin (33), the oxalic acid bin (32) and the metal iron powder bin (34) are more than 2 tons in stock, special thermometers are arranged in the lean solution box A (30) and the lean solution box B (31), carbon steel materials are arranged outside the lean solution box A (30) and the lean solution box B (31), and vinyl resin anti-corrosion lining is arranged inside the lean solution box A (30) and the lean solution box B (31).
8. The pilot scale platform for producing ferrous oxalate and zinc-rich slag by using electric furnace dust, according to claim 1, wherein the pilot scale platform is characterized in that: the electric heating water tank (3) is made of titanium pipe material, the size mixing kettle A (6) and the size mixing kettle B (21) and the leaching kettle A (10) and the leaching kettle B (22) are both provided with variable-frequency mixers, and the treatment capacity of the water purifier (2) is not less than 1m 3 And/h, the water purifier (2) comprises a sand filter with the diameter not smaller than 400mm and active carbon, and a volume larger than 2m 3 Is a raw water tank of the water pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321773365.9U CN220335267U (en) | 2023-07-07 | 2023-07-07 | Pilot-scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321773365.9U CN220335267U (en) | 2023-07-07 | 2023-07-07 | Pilot-scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust |
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| CN220335267U true CN220335267U (en) | 2024-01-12 |
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| CN202321773365.9U Active CN220335267U (en) | 2023-07-07 | 2023-07-07 | Pilot-scale platform for producing ferrous oxalate and zinc-rich slag by utilizing electric furnace dust |
Country Status (1)
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| CN (1) | CN220335267U (en) |
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2023
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