CN205398139U - Iron oxide red industry pigment dry process production facility - Google Patents
Iron oxide red industry pigment dry process production facility Download PDFInfo
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- CN205398139U CN205398139U CN201620137976.8U CN201620137976U CN205398139U CN 205398139 U CN205398139 U CN 205398139U CN 201620137976 U CN201620137976 U CN 201620137976U CN 205398139 U CN205398139 U CN 205398139U
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Abstract
The utility model discloses an iron oxide red industry pigment dry process production facility, including conversion reaction ware, screw conveyer, dry reactor, calcining kiln, pulp sink, pressure filter, high -order feed bin, dry rubbing crusher and cyclone, pulse cloth screen, through screw conveyer with bucket elevator's transportation will be delivered to the pulp sink through material delivery system and done water collection and handle, then get rid of the soluble salt class in burning till the material through the pressure filter filtration washing by the material that burns till of calcining kiln output, receive the iron oxide red filter cake through carrying to dry rubbing crusher, make the iron oxide red powder through crushing and drying, it is the output finished product to send the automatic packaging machine packing with the iron oxide red powder. The utility model provides a by the magnetic iron ore, the haematite, shining ore and other iron content mineral, waste material production iron oxide red's equipment configuration problem, but have the smooth and easy continuity operation of flow, be convenient for realize production automation, energy -conservation, pollution -free, advantage such as product quality is stable.
Description
Technical field
This utility model relates to technical field of chemical, is specifically related to a kind of iron oxide red commercial pigments dry production equipment.
Background technology
Iron oxide red commercial pigments is yield and the Inorganic Chemical Color having the call in inorganic color pigment.At present, the ferric oxide red colorant of 70% uses chemical synthesis process, and namely prepared by wet processing, and 30% is adopt with natural minerals or other iron-bearing material to pulverize or calcination method, i.e. dry process.nullIn the production technology of chemosynthesis iron oxide pigment，Commonly used two-step reaction method，Namely first step oxidation reaction prepares crystal seed，Second step prepares ferrum system commercial pigments with obtained crystal seed for base material oxidation，Wherein JZPD capsule and the commercial pigments synthesis of ferrum system carry out respectively in two complete equipments，The reactor used is cylindric reactive tank，First technical process prepares crystal seed in oxidation reactor，Crystal seed is sent into ferrum system commercial pigments oxidative synthesis reactor again，Then reaction raw materials ferrous salt solution is added in reactor，Add iron sheet、Iron scale and sodium hydroxide solution or ammonia regulate the pH value of reaction system，At a certain temperature，Bottom oxidation reactor, pass into air carry out oxidation reaction，The crystal seed in system is made to grow into ferrum system commercial pigments，The stopped reaction when mill base reaches required pigment colour luminosity in reactor，By slurry filtration、Washing、Dehydration、Dry、Packaging prepares ferrum system commercial pigments.It is that product quality controllability is strong, good product quality that chemical synthesis prepares the advantage of iron oxide red, it is possible to meeting the needs in each field, but shortcoming is that the production cycle is long, production process has substantial amounts of waste water to produce, and environment is had impact；The advantage of dry process is can directly to prepare iron oxide red with iron-bearing mineral or iron salt (ferrous sulfate etc.), and flow process is short, and equipment investment is few；Weak point is that technical process has waste gas to produce, and coloured light degree and properties of product are slightly poorer than Wet from the technique reported, dry process mainly has Melanteritum calcination method, iron oxide yellow calcination method, iron black calcination method, hematite process, magnetic iron ore method etc., when producing iron oxide red with magnetic iron ore, speculum iron or bloodstone, magnetic iron ore, speculum iron or ground hematite need to be mixed with reactant, thing is adjusted mutually, then carries out processing prepared iron oxide red commercial pigments.From existing technique, technical process also exist thing adjust that material viscosity is big mutually, bonding and agglomeration obvious, between each operating unit, material conveying difficulty is big, and thing adjusts mutually and subsequent processes has the problems such as waste gas generation.These problems limit popularization and the application of being prepared iron oxide red commercial pigments technique by magnetic iron ore, speculum iron or bloodstone, and meanwhile, up to the present, existing technique is also without the equipment allocation problem solving commercial process.
Utility model content
For solving drawbacks described above, the purpose of this utility model is to provide a kind of iron oxide red commercial pigments dry production equipment, technologic deficiency during by magnetic iron ore, speculum iron or bloodstone dry process iron oxide red commercial pigments can be overcome, solve the equipment allocation problem of course of industrialization, guarantee the realization of the smooth and easy of production process and process goal, it is effectively improved production efficiency, ensure product quality, eliminate the impact because exhaust emissions causes to environment, advance the industrialization being prepared iron oxide red dry preparation process by magnetic iron ore, speculum iron or bloodstone.
For reaching above-mentioned purpose, the technical solution adopted in the utility model is: a kind of iron oxide red commercial pigments dry production equipment, including the conversion reactor of material initial treatment；Described conversion reactor discharge end is sequentially provided with the conveying worm and dry reactor that possess heating function；Described dry reactor passes sequentially through described conveying worm, bucket elevator is connected to calcining kiln；Described calcining kiln has been connected below cooler, and described cooler passes sequentially through described conveying worm, bucket elevator is connected to pulping and washing groove；Described pulping and washing groove discharge end is connected to pressure filter by a water pump；Described pressure filter passes sequentially through described conveying worm, bucket elevator is connected to high hopper；Described high hopper is connected with drying and crushing machine, the first cyclone dust extractor and the first pulse bag dust-precipitator in turn through described conveying worm；It is respectively connected with wind conducting pipe below described first cyclone dust extractor and described first pulse bag dust-precipitator discharging opening, described wind conducting pipe is connected with the second cyclone dust extractor and the second pulse bag dust-precipitator in turn, described second cyclone dust extractor and described second pulse bag dust-precipitator discharging opening are respectively connected with device of full automatic packaging, described second pulse bag dust-precipitator top is provided with gas outlet, and described gas outlet is connected to air-introduced machine.
Preferably, described conversion reactor and described dry reactor are respectively connected with the first device for absorbing tail gas, described calcining kiln is connected to the second device for absorbing tail gas, described first device for absorbing tail gas and described second device for absorbing tail gas all include absorbing liquid circulating box, described absorption liquid circulating box is connected to circulating pump, absorption liquid circulating box in wherein said first device for absorbing tail gas is also associated with hydraulic ejector, absorption liquid circulating box in described second device for absorbing tail gas is also associated with spray absorber, described spray absorber has been also respectively connected with air-introduced machine and the 3rd cyclone dust extractor.
Circulating-pump outlet in described first device for absorbing tail gas is also connected with the absorption liquid circulating box in described second device for absorbing tail gas.
Described calcining kiln can be rotary kiln, can also be shuttle kiln, tunnel cave, pushed bat kiln or electric heating roller kilns, and described calcining kiln side is provided with burner, described burner is connected to natural gas line, and described burner was provided with burning controller with described calcining kiln junction.
Described cooler is respectively arranged at two ends with cooling air inlet and cooling air outlet, and described cooling air outlet is connected with described air inlet of combustor.
Described conversion reactor is sealed container, and described conversion reactor includes reactor body and is located at the lid above described reactor body, described reactor body is provided with reductor and agitator, and described reactor body side is additionally provided with discharge gate, described top surface is respectively equipped with material charge door, reactant charge door, standby mouth and exhaust port.
Described conversion reactor, described dry reactor and described drying and crushing machine are internal all adopts corrosion-resistant stainless steel material with material contact site.
The washing channel of described pressure filter is connected to sink, and described pressure filter is additionally provided with washing liquid outlet.
Described dry reactor adopts rake vacuum desiccator or Rotatingandflashstreamingdrier.
Described drying and crushing machine adopts Rotatingandflashstreamingdrier or strengthening airflow dryer.
This utility model is in use, material passes sequentially through conversion reactor, conveying worm, dry reactor, calcining kiln, pulping and washing groove, pressure filter, high hopper, drying and crushing machine and cyclone dust extractor, pulse bag dust-precipitator, transhipment by described conveying worm and bucket elevator, complete the production process to iron oxide red commercial pigments, to be expected that delivering to pulping and washing groove through material-transporting system does the process of water extraction by burning till of calcining kiln output in process of production, then remove, through Filter Press washing, the solubility salt burning till in material, receive to obtain iron oxide red filter cake, iron oxide red filter cake is sent into through conveying and aggregate-storing system the drying machine of tool crushing function, drying is pulverized prepared iron oxide red, automatic packaging machine packaging and output finished product is sent by iron oxide red.
The first device for absorbing tail gas supporting with conversion reactor, dry reactor in this utility model is formed by absorbing liquid circulating box, circulating pump and hydraulic ejector, absorption process forms negative pressure in described conversion reactor and dry reactor, when in circulation fluid in absorption liquid circulating box, chemical substance concentration reaches certain value, this absorption liquid is sent to the absorption liquid circulating box of the second device for absorbing tail gas, as calcining kiln tail gas absorption agent through pipeline；nullSecond device for absorbing tail gas supporting with calcining kiln is by the 3rd cyclone dust extractor、Spray absorber、Absorb liquid circulating box、Circulating pump and air-introduced machine composition，The high temperature discharged in calcining kiln kiln the tail gas with dust are introduced the 3rd cyclone dust extractor by air-introduced machine by absorption process successively，The dust of entrained with in tail gas is made to be separated and collected and be returned in calcining kiln by dust，Gas in 3rd cyclone dust extractor is entered the bottom of spray absorber by upper air outlet by pipeline，Under the graviational interaction of air-introduced machine up in spray absorber，Up process contacts with the absorption liquid from top to bottom sprayed，The chemical substance in upward flowing air is made to be absorbed by liquid absorption，When the chemical substance absorbed in liquid reaches finite concentration，Conversion reactor is sent to recycle,The tail gas being purified is passed through pipeline through the harmless emptying of air-introduced machine by spray absorber top.
Pass through technique scheme, solve by the equipment allocation problem of magnetic iron ore, speculum iron or bloodstone dry process iron oxide red commercial pigments, solve production process material viscosity excessive, bonding and agglomeration operating unit obvious, each between material conveying difficulty big, thing adjusts mutually and subsequent processes is because the generation of waste gas is to problems such as environments, and obtained iron oxide red commercial pigments meets national standard.Have flow process smooth and easy, can seriality operation, facilitate implementation the advantage such as the production automation, energy-conservation, pollution-free, stable and reliable product quality.
Accompanying drawing explanation
Below according to drawings and Examples, structure and features of the present utility model is further described.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of conversion reactor described in Fig. 1.
nullIn accompanying drawing 1 and Fig. 2，1. conversion reactor，2. the first device for absorbing tail gas，3. conveying worm，4. dry reactor，5. burner，6. pulping and washing groove，7. bucket elevator，8. calcining kiln，9. washing liquid outlet，10. natural gas line，11. hydraulic ejector，12. circulating pump，13. pressure filter，14. sink，15. cooling air inlet，16. cooling air outlet，17. high hopper，18. the first cyclone dust extractor，19. drying and crushing machine，20. the first pulse bag dust-precipitator，21. the second pulse bag dust-precipitator，22. material charge door，23. reactant charge door，24. reductor，25. exhaust port，26. lid，27. reactor body，28. agitator，29. discharge gate，30. cooler，31. cross burning controller，32. absorb liquid circulating box，33. air-introduced machine，34. spray absorber，35. the 3rd cyclone dust extractor，36. wind conducting pipe，37. the second cyclone dust extractor，38. device of full automatic packaging，39. the second device for absorbing tail gas，40. standby mouth.
Detailed description of the invention
With reference to accompanying drawing 1 and Fig. 2, a kind of iron oxide red commercial pigments dry production equipment, including the conversion reactor 1 of material initial treatment；Described conversion reactor 1 discharge end is sequentially provided with the conveying worm 3 and dry reactor 4 that possess heating function；Described dry reactor 4 passes sequentially through described conveying worm 3, bucket elevator 7 is connected to calcining kiln 8；Described calcining kiln 8 has been connected below cooler 30, and described cooler 30 passes sequentially through described conveying worm 3, bucket elevator 7 is connected to pulping and washing groove 6；Described pulping and washing groove 6 discharge end is connected to pressure filter 13 by a water pump；Described pressure filter 13 passes sequentially through described conveying worm 3, bucket elevator 7 is connected to high hopper 17；Described high hopper 17 is connected with drying and crushing machine the 19, first cyclone dust extractor 18 and the first pulse bag dust-precipitator 20 in turn through described conveying worm 3；It is respectively connected with wind conducting pipe 36 below described first cyclone dust extractor 18 and described first pulse bag dust-precipitator 20 discharging opening, described wind conducting pipe 36 is connected with the second cyclone dust extractor 37 and the second pulse bag dust-precipitator 21 in turn, described second cyclone dust extractor 37 and described second pulse bag dust-precipitator 21 discharging opening are respectively connected with device of full automatic packaging 38, described second pulse bag dust-precipitator 21 top is additionally provided with gas outlet, and described gas outlet is connected to air-introduced machine 33.
Preferably, described conversion reactor 1 and described dry reactor 4 are respectively connected with the first device for absorbing tail gas 2, described calcining kiln 8 is connected to the second device for absorbing tail gas 39, described first device for absorbing tail gas 2 and described second device for absorbing tail gas 39 all include absorbing liquid circulating box 32, described absorption liquid circulating box 32 is connected to circulating pump 12, absorption liquid circulating box 32 in wherein said first device for absorbing tail gas 2 is also associated with hydraulic ejector 11, absorption liquid circulating box 32 in described second device for absorbing tail gas 39 is also associated with spray absorber 34, described spray absorber 34 has been also respectively connected with air-introduced machine 33 and the 3rd cyclone dust extractor 35.
Circulating pump 12 in described first device for absorbing tail gas 2 exports and is also connected with the absorption liquid circulating box 32 in described second device for absorbing tail gas 39.
Described calcining kiln 8 can be rotary kiln, can also be shuttle kiln, tunnel cave, pushed bat kiln or electric heating roller kilns, and described calcining kiln 8 side is provided with burner 5, described burner 5 is connected to natural gas line 10, and described burner 5 was provided with burning controller 31 with described calcining kiln 8 junction.
Described cooler 30 is respectively arranged at two ends with cooling air inlet 15 and cooling air outlet 16, and described cooling air outlet 16 is connected with described burner 5 air inlet.
Described conversion reactor 1 is sealed container, and described conversion reactor 1 includes reactor body 27 and is located at the lid 26 above described reactor body 27, described reactor body 27 is provided with reductor 24 and agitator 28, and described reactor body 27 side is additionally provided with discharge gate 29, described lid 26 surface is respectively equipped with material charge door 22, reactant charge door 23, standby mouth 40 and exhaust port 25.
Described conversion reactor 1, described dry reactor 4 and described drying and crushing machine 19 are internal all adopts corrosion-resistant stainless steel material with material contact site.
The washing channel of described pressure filter 13 is connected to sink 14, and described pressure filter 13 is additionally provided with washing liquid outlet 9.
Described dry reactor 4 adopts rake vacuum desiccator or Rotatingandflashstreamingdrier.
Described drying and crushing machine 19 adopts Rotatingandflashstreamingdrier or strengthening airflow dryer.
By above technical scheme, the beneficial effects of the utility model can show from following example:
Embodiment 1: produce iron oxide red by magnetic iron ore.
To be 325 orders through selected obtained fineness, iron content be 71% fine powder of magnetite 50kg put in the conversion reactor that volume is 200L through wind model batcher, be separately added into reactant A and B, react about 20min discharging, sending into rake vacuum drying reactor, drying prepares predecessor.Rotary calciner is sent by predecessor, control calcining heat and calcination time, prepare and burn till material, to burn till in material feeding pulping and washing groove and do the process of water extraction, prepare iron oxide red slip, by iron oxide red slip Filter Press, washing, prepare iron oxide red wet cake, sending expansion drying system by iron oxide red wet cake, drying is pulverized and is prepared the iron oxide red finished product 52.5kg that fineness is 325 orders, and coloured light degree meets national standard.Reaction and calcination process, by tail gas is absorbed, receive to obtain reactant B, recycle, and process is without noxious gas emission.
Embodiment 2: produce iron oxide red by magnetic iron ore.
To be 325 orders through selected obtained fineness, iron content be 71% fine powder of magnetite 50kg put in the conversion reactor that volume is 200L through spiral feeder, be separately added into reactant A and B, react about 20min discharging, sending into rake vacuum drying reactor, drying prepares predecessor.Predecessor is sent back to shuttle-type calcining kiln, control calcining heat and calcination time, prepare and burn till material, to burn till in material feeding pulping and washing groove and do the process of water extraction, prepare iron oxide red slip, by iron oxide red slip Filter Press, washing, prepare iron oxide red wet cake, sending strengthening flow drying system by iron oxide red wet cake, drying is pulverized and is prepared the iron oxide red finished product 52.8kg that fineness is 325 orders, and coloured light degree meets national standard.Reaction and calcination process, by tail gas is absorbed, receive to obtain reactant B, recycle, and process is without noxious gas emission.
Embodiment 3: produce iron oxide red by speculum iron.
To be 325 orders through selected obtained fineness, put in the conversion reactor that volume is 200L through wind model batcher containing the specular hematite concentrate 50kg that ferrum oxide is 98%, be separately added into reactant A and B, react about 20min discharging, sending into rake vacuum drying reactor, drying prepares predecessor.Rotary calciner is sent by predecessor, control calcining heat and calcination time, prepare and burn till material, to burn till in material feeding pulping and washing groove and do the process of water extraction, prepare iron oxide red slip, by iron oxide red slip Filter Press, washing, prepare iron oxide red wet cake, sending expansion drying system by iron oxide red wet cake, drying is pulverized and is prepared the iron oxide red finished product 49.5kg that fineness is 325 orders, and coloured light degree meets national standard.Reaction and calcination process, by tail gas is absorbed, receive to obtain reactant B, recycle, and process is without noxious gas emission.
Embodiment 4: produce iron oxide red by speculum iron.
To be 325 orders through selected obtained fineness, put in the conversion reactor that volume is 200L containing the specular hematite concentrate 50kg that ferrum oxide ferrum is 97% through spiral feeder, it is separately added into reactant A and B, react about 20min discharging, sending into rake vacuum drying reactor, drying prepares predecessor.Predecessor is sent into shuttle-type calcining kiln, control calcining heat and calcination time, prepare and burn till material, to burn till in material feeding pulping and washing groove and do the process of water extraction, prepare iron oxide red slip, by iron oxide red slip Filter Press, washing, prepare iron oxide red wet cake, sending strengthening flow drying system by iron oxide red wet cake, drying is pulverized and is prepared the iron oxide red finished product 52.8kg that fineness is 325 orders, and coloured light degree meets national standard.Reaction and calcination process, by tail gas is absorbed, receive to obtain reactant B, recycle, and process is without noxious gas emission.
It is appreciated that by above example, this utility model solves by the equipment allocation problem of magnetic iron ore, speculum iron or bloodstone dry process iron oxide red commercial pigments, solve production process material viscosity excessive, bonding and agglomeration operating unit obvious, each between material conveying difficulty big, thing adjusts mutually and subsequent processes produces problems such as the serialitys of environment, product quality and production because of waste gas, have flow process smooth and easy, can seriality operation, facilitate implementation the advantage such as the production automation, energy-conservation, pollution-free, stable and reliable product quality.
Described above is only preferred embodiment of the present utility model; above-mentioned specific embodiment is not to restriction of the present utility model; retouching, amendment or the equivalent replacement that all those of ordinary skill in the art make as described above, belongs to protection domain of the present utility model.
Claims (10)
1. an iron oxide red commercial pigments dry production equipment, it is characterised in that: include the conversion reactor of material initial treatment；Described conversion reactor discharge end is sequentially provided with the conveying worm and dry reactor that possess heating function；Described dry reactor passes sequentially through described conveying worm, bucket elevator is connected to calcining kiln；Described calcining kiln has been connected below cooler, and described cooler passes sequentially through described conveying worm, bucket elevator is connected to pulping and washing groove；Described pulping and washing groove discharge end is connected to pressure filter by a water pump；Described pressure filter passes sequentially through described conveying worm, bucket elevator is connected to high hopper；Described high hopper is connected with drying and crushing machine, the first cyclone dust extractor and the first pulse bag dust-precipitator in turn through described conveying worm；It is respectively connected with wind conducting pipe below described first cyclone dust extractor and described first pulse bag dust-precipitator discharging opening, described wind conducting pipe is connected with the second cyclone dust extractor and the second pulse bag dust-precipitator in turn, described second cyclone dust extractor and described second pulse bag dust-precipitator discharging opening are respectively connected with device of full automatic packaging, described second pulse bag dust-precipitator top is provided with gas outlet, and described gas outlet is connected to air-introduced machine.
2. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterized in that: described conversion reactor and described dry reactor are respectively connected with the first device for absorbing tail gas, described calcining kiln is connected to the second device for absorbing tail gas, described first device for absorbing tail gas and described second device for absorbing tail gas all include absorbing liquid circulating box, described absorption liquid circulating box is connected to circulating pump, absorption liquid circulating box in wherein said first device for absorbing tail gas is also associated with hydraulic ejector, absorption liquid circulating box in described second device for absorbing tail gas is also associated with spray absorber, described spray absorber has been also respectively connected with air-introduced machine and the 3rd cyclone dust extractor.
3. iron oxide red commercial pigments dry production equipment according to claim 2, it is characterised in that: the circulating-pump outlet in described first device for absorbing tail gas is also connected with the absorption liquid circulating box in described second device for absorbing tail gas.
4. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterized in that: described calcining kiln can be rotary kiln, can also be shuttle kiln, tunnel cave, pushed bat kiln or electric heating roller kilns, and described calcining kiln side is provided with burner, described burner is connected to natural gas line, and described burner was provided with burning controller with described calcining kiln junction.
5. iron oxide red commercial pigments dry production equipment according to claim 4, it is characterised in that: described cooler is respectively arranged at two ends with cooling air inlet and cooling air outlet, and described cooling air outlet is connected with described air inlet of combustor.
6. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterized in that: described conversion reactor is sealed container, and described conversion reactor includes reactor body and is located at the lid above described reactor body, described reactor body is provided with reductor and agitator, and described reactor body side is additionally provided with discharge gate, described top surface is respectively equipped with material charge door, reactant charge door, standby mouth and exhaust port.
7. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterised in that: described conversion reactor, described dry reactor and described drying and crushing machine are internal all adopts corrosion-resistant stainless steel material with material contact site.
8. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterised in that: the washing channel of described pressure filter is connected to sink, and described pressure filter is additionally provided with washing liquid outlet.
9. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterised in that: described dry reactor adopts rake vacuum desiccator or Rotatingandflashstreamingdrier.
10. iron oxide red commercial pigments dry production equipment according to claim 1, it is characterised in that: described drying and crushing machine adopts Rotatingandflashstreamingdrier or strengthening airflow dryer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620137976.8U CN205398139U (en) | 2016-02-24 | 2016-02-24 | Iron oxide red industry pigment dry process production facility |
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| CN201620137976.8U CN205398139U (en) | 2016-02-24 | 2016-02-24 | Iron oxide red industry pigment dry process production facility |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111755661A (en) * | 2020-06-30 | 2020-10-09 | 荆门市格林美新材料有限公司 | Battery material washing and calcining integrated device and method |
| CN113511634A (en) * | 2021-05-08 | 2021-10-19 | 佛山市景嘉机电设备有限公司 | System and method for preparing sulfuric acid by recycling waste ferric sulfate crude salt in acid washing of steel industry |
-
2016
- 2016-02-24 CN CN201620137976.8U patent/CN205398139U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111755661A (en) * | 2020-06-30 | 2020-10-09 | 荆门市格林美新材料有限公司 | Battery material washing and calcining integrated device and method |
| CN113511634A (en) * | 2021-05-08 | 2021-10-19 | 佛山市景嘉机电设备有限公司 | System and method for preparing sulfuric acid by recycling waste ferric sulfate crude salt in acid washing of steel industry |
| CN113511634B (en) * | 2021-05-08 | 2023-11-10 | 佛山市景嘉机电设备有限公司 | System and method for preparing sulfuric acid by recycling waste ferric sulfate crude salt in steel industry through pickling |
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