CN102285688A - Roasting oxidation comprehensive detoxification clean process of chromium slag - Google Patents

Roasting oxidation comprehensive detoxification clean process of chromium slag Download PDF

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Publication number
CN102285688A
CN102285688A CN2011101580918A CN201110158091A CN102285688A CN 102285688 A CN102285688 A CN 102285688A CN 2011101580918 A CN2011101580918 A CN 2011101580918A CN 201110158091 A CN201110158091 A CN 201110158091A CN 102285688 A CN102285688 A CN 102285688A
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chromium
water
chromium slag
roasting
slag
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史建斌
姜桂荣
郭秀清
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Qinghai Zhongxing Chemical Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

The invention relates to a roasting oxidation comprehensive detoxification clean process. The technical scheme is as follows: the roasting oxidation comprehensive detoxification clean process of chromium slag is characterized in that the chromium slag is used as a raw material, chromite and calcined soda are used as auxiliaries, the material ratio of chromium slag to chromite to calcined soda is 2:1:0.6, roasting reaction temperature is 1050 DGE C, chromic oxide in the mixed material is subjected to high-temperature roasting oxidation to generate sodium chromate, and the conversion rate is above 80%; and leaching liquor is used as a mother liquid for producing a sodium bichromate product, and a main process flow comprises roasting oxidation, ball-milling leaching, plate-frame pressure filtration and dewatering, sodium bichromate liquid preparation, filter cake twice pulping for extracting supernatant, acidification and solidification and landfill or material building; and the content of total chromium in the detoxified slag is low, comprehensive utilization ratio is high, and cost is low, thereby solving the posttreatment problem existing in the traditional dry-wet chromium slag detoxifying process. The process provided by the invention is also suitable for calcium-containing, low-calcium and calcium-free roasting production in a chromium salt production enterprise and also has obvious effect.

Description

The chromium slag roasting oxidation cleaning procedure that comprehensively detoxifies
 
Technical field
The present invention relates to the chromium slag and adopt the roasting oxidation cleaning procedure that comprehensively detoxifies.
Background technology
After the chromium residue that China present various chromium salt production enterprise has calcium, few calcium and calcium-free roasting to be produced is taked dried wet method detoxifcation, chromium cpd content height in the slag, reversible reaction easily takes place, particularly the chromium slag after solidifying is used for producing the building materials process, trivalent chromium at high temperature is oxidized to sexavalent chrome again, it is not thorough that detoxifcation takes place, secondary pollution easily takes place and influence building material quality etc. problem.
In the chromic slag dry method detoxication technological process, because of detoxifcation yields poorly, speed is slow, it is not thorough to detoxify, and makes a low multiple use after the detoxifcation, does not have detoxifcation slag landfill yard and detoxifcation cost height, does not meet country to environmental requirement.
The present invention proposes a kind of chromium slag and adopt the roasting oxidation cleaning procedure that comprehensively detoxifies.Vat liquor makes to produce the mother liquor of sodium dichromate product, and total chrome content is low in the detoxifcation slag, and the comprehensive utilization ratio height solves the back handling problems that conventional dry wet method chromium residue detoxifying process exists.At present, domestic still do not have this type of disposing technique and a method.
Summary of the invention
After the chromium residue that The present invention be directed to China present various chromium salt production enterprise has calcium, few calcium and calcium-free roasting to be produced is taked dried wet method detoxifcation, chromium cpd content height in the slag, reversible reaction easily takes place, particularly the chromium slag after solidifying is used for producing the building materials process, trivalent chromium at high temperature is oxidized to sexavalent chrome again, it is not thorough that detoxifcation takes place, secondary pollution easily taking place and influence problem such as building material quality, the present invention proposes a kind of chromium slag and adopt the roasting oxidation cleaning procedure that comprehensively detoxifies for addressing the above problem.Vat liquor makes to produce the mother liquor of sodium dichromate product, and total chrome content is low in the detoxifcation slag, and the comprehensive utilization ratio height has solved the back handling problems that conventional dry wet method chromium residue detoxifying process exists, and combines with producing.
For addressing the above problem the technical solution used in the present invention be: the chromium slag roasting oxidation cleaning procedure that comprehensively detoxifies, it is characterized in that: with the chromium slag is raw material, chromite and soda ash are auxiliary material, material ratio: chromium slag: chromite: soda ash=2:1:0.6, and in roasting temperature of reaction 1050 0C, chromium sesquioxide is generating Sodium chromate through the high-temperature roasting oxidation in the mixed material, transformation efficiency is more than 80%, wherein vat liquor makes to produce the mother liquor of sodium dichromate product, main technical process: supernatant liquor+acidifying curing+landfill or building materials are extracted in roasting oxidation+ball milling leaching+filter press dehydration+liquid production sodium dichromate+filter cake secondary making beating.
The described chromium slag roasting oxidation cleaning procedure that comprehensively detoxifies is characterized in that: its processing step:
(1) roasting oxidation
Chromium slag, chromite and soda ash are auxiliary material, and the chromium slag is a raw material, replace rhombspar and Wingdale as auxiliary material again, mixed material chromium sesquioxide is generating Sodium chromate through the high-temperature roasting oxidation, and transformation efficiency is more than 80%, material ratio: chromium slag: chromite: soda ash=2:1:0.6, roasting temperature of reaction 1050 0C;
(2) ball milling leaching
Grog enters wet-type ball mill, and diffusion water is for being contained chromium underground water and secondary making beating supernatant liquor, and the slurry ball-milling temperature is 60～90 ℃;
Utilize residual oxide further to carry out oxidizing reaction;
Figure 417375DEST_PATH_IMAGE002
Utilize the friability and the grindability of grog, improve water-soluble chromic solubility rate, solid-to-liquid ratio is 1:2, and granularity is more than 200 orders, and water-soluble sexavalent chrome solubility rate is more than 65%;
(3) filter press dehydration
Washing dehydration, water-soluble sexavalent chrome solubility rate is more than 65%, liquid is as producing sodium dichromate mother liquor input production plant, dehydration back filter cake (water content about 20%);
(4) sodium dichromate is made
Press filtration liquid as producing sodium dichromate mother liquor input production plant, is produced sodium dichromate through concentrate, drying etc.;
(5) supernatant liquor is extracted in the making beating of filter cake secondary
Dehydration back filter cake is sized mixing to enter in water-soluble and sour molten jar through secondary and is carried out stripping and cure stage, the churning time of sizing mixing is 30min, the water-soluble of 30%-35% and solubility in acid sexavalent chrome are still arranged in the slip, through the water-soluble sexavalent chrome stripping of post precipitation, supernatant liquor returns ball mill as the ball milling water or as the mother liquor that reclaims chromium hydroxide;
(6) acidifying is solidified
Water-soluble chromium and sour molten chromium under the effect of sulfuric acid and ferrous sulfate through fully stirring the sour molten chromic acid stripping in back and carrying out ageing and react, after being reduced to trivalent chromium, be incorporated in the lattice, be fixed with harmful substances with stabilization medicament ferrous sulfate,, will be harmful to component and arrive with matrix bond by forming crystalline network and chemical bond, reduce the leaching toxicity of harmful component in the Hazardous wastes, reduce total chromium and total alkali in the chromium slag of detoxifcation back significantly, pH value 5～6, the reaction times is 12～20 h;
(7) landfill or building materials
Total chromium reduces significantly with total alkali in the chromium slag of detoxifcation back, improves security and the utilization ratio that dispose the back, can carry out landfill or production building materials safely after up to standard.
Can carry out landfill after chromium slag after the detoxifcation is up to standard or produce all kinds of building materials.
The described chromium slag roasting oxidation cleaning procedure that comprehensively detoxifies is characterized in that: utilize to contain chromium underground water and secondary making beating supernatant liquor as the ball milling diffusion water, factory effluent is all closed circuit.
The invention has the beneficial effects as follows: a kind of chromium slag of the present invention adopts the roasting oxidation cleaning procedure that comprehensively detoxifies,
Vat liquor makes to produce the mother liquor of sodium dichromate product, and total chrome content is low in the detoxifcation slag, and the comprehensive utilization ratio height has solved the cost height that conventional dry wet method chromium residue detoxifying process exists, and secondary pollution easily takes place, back disposal efficiency difference problem.At present, domestic still do not have this type of disposing technique and a method, belongs to new and high technology and advanced field in the chromium residue detoxifying process.What this method was equally applicable to chromium salt production enterprise has calcium, few calcium and calcium-free roasting production, and effect is remarkable equally.
The chromium slag is taked the calcined oxide cleaning procedure that comprehensively detoxifies, efficiently solve the disposal speed and the effect of chromium slag.Prevent residual water-soluble chromium stripping in the chromium slag of detoxifcation back ,] reduction and secondary pollution, at utmost reduced total chromium and content of 6-valence Cr ions in the slag of detoxifcation back.Guarantee to carry out landfill and security and reliability when fully utilizing through what this technology was disposed back chromium slag.Finish the task and the requirement of the proposition of country and provinces and cities' environmental protection and relevant departments.
This detoxification technique is followed advanced technology, the liquid that science is reliable, technology is rationally feasible, produced, solid thing can be the production supplementary material, integrated artistic is realized comprehensive utilization, cleaner production and pollutent qualified discharge, eliminated and in leaching leaching water has easily taken place during charging and collapse and spatter, production environment and people have been caused pollute and the phenomenon of injury.Shorten the production cycle, improve Working environment, alleviate working strength, reduce disposal costs and production cost, increase economic efficiency.Meet and provided " cleaner production " (Cleaner Prduction) definition in the Law of the People's Republic of China on Promoting Clean Production (2003.01), that is: cleaner production is meant measures such as constantly taking to improve design, use clean energy and raw material, the Technology of taking the advanced person and equipment, improvement management, comprehensive utilization, pollutes from source reduction, improve resource utilization, reduce or avoid producing, the generation and the discharging of pollutent in service and the product use, to alleviate or to eliminate requirement and purpose to the harm of human health and environment.And fundamentally solving the second standard that detoxification chromium slag can only reach general industry solid waste, reversible reaction takes place when being used for building materials in total chromium and total alkali height under hot conditions, the reductive trivalent chromium is oxidized to chromic phenomenon again.Substitute 55% raw material and 30% rhombspar and Wingdale auxiliary material with the chromium slag, improve transformation efficiency, the Sodium chromate leaching yield is greater than 65%.Carry out source reduction comprehensively and process of producing product is implemented Whole Process Control.By to a series of technological improvement of production process, the water that is produced, gas and solid waste are all cleared up and the circulation comprehensive utilization in process of production, realize the industry cleaner production, obtain good result and reach the purpose of implementing in full recycling economy.The change and the innovation of current production technique and equipment meet in the cleaner production innoxious, resource utilization to Solid waste disposal, minimizing and " four R " principle of utilizationization again.Accomplish the rationalization of natural resources and energy utilization,, obtain maximum economy and environmental benefit with minimum raw and auxiliary material and energy consumption.And accomplish to greatest extent natural resources and energy utilization maximum reasonableization, maximization of economic benefit, the harm of the mankind and environment is minimized.Fundamentally solving detoxifcation back chromium slag can only make a low multiple use by the general industry solid waste landfill, and secondary pollution problem easily takes place.
Description of drawings
Fig. 1 is the chromium slag roasting oxidation cleaning procedure schema that comprehensively detoxifies.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment
The chromium slag roasting oxidation of the present invention cleaning procedure that comprehensively detoxifies, main technical process: supernatant liquor+acidifying curing+landfill or building materials are extracted in roasting oxidation+ball milling leaching+filter press dehydration+liquid production sodium dichromate making+filter cake secondary making beating.
1. the chromium slag is taked the roasting oxidation cleaning procedure that comprehensively detoxifies: principal reaction mechanism raw material is the chromium slag, and chromite and soda ash are auxiliary material, and the chromium slag is a raw material, replaces rhombspar and Wingdale as auxiliary material again, and material is at stoving oven 1050 0Under the C, trivalent chromium residual in high temperature and soda ash and the chromium slag is oxidized to sexavalent chrome through high-temperature roasting, and transformation efficiency is more than 80%, drop temperature 800 0C is cooled to 90 through cooling kiln 0Enter wet-type ball mill below the C, Gu: liquor ratio is 1:2, and raw meal particle size is 200 orders, in warm and humid formula ball milling: allow the chromium slag carry out ball milling in certain temperature band temperature,
Figure 754815DEST_PATH_IMAGE001
Utilize residual oxide further to carry out oxidizing reaction, improve transformation efficiency, the dust suction of increase and mist of chromic acid adsorption unit have been eliminated a small amount of airborne dust and the trace chromium acid mist phenomenon that charging and ball-milling reaction are produced;
Figure 21455DEST_PATH_IMAGE002
Utilize the friability and the grindability of grog, enhance productivity;
Figure 2011101580918100002DEST_PATH_IMAGE003
Improve water-soluble chromic solubility rate, change the transfer slurry tank over to through the plate-and-frame filter press washing dehydration, water-soluble sexavalent chrome solubility rate is more than 65%.Liquid is as producing sodium dichromate mother liquor input production plant, dehydration back filter cake (water content about 22%) is sized mixing to enter in water-soluble and sour molten jar through secondary and is carried out stripping and cure stage, water-soluble and the solubility in acid sexavalent chrome in 35% left and right sides is still arranged in the slip, water-soluble sexavalent chrome is through post precipitation, and supernatant liquor returns ball mill as the ball milling water or as the mother liquor that reclaims chromium hydroxide.Production process realizes the processing wastewater zero release.Still residual 0.5% water-soluble and sour molten chromium in the slip, 0.5% remaining about solubility in acid sexavalent chrome adds the souring agent stripping, water-soluble chromium and sour molten chromium are carrying out the ageing reaction after fully stirring under the effect of medicament, after being reduced to trivalent chromium, be incorporated in the lattice, be fixed with harmful substances, by forming crystalline network and chemical bond with the stabilization medicament, to be harmful to component and arrive, reduce the leaching toxicity of harmful component in the Hazardous wastes with matrix bond.Reduce total chromium and total alkali in the chromium slag of detoxifcation back significantly, can carry out landfill or produce building materials after up to standard.Guarantee the safety comprehensive utilization quality and the environmental safety of detoxifcation back chromium slag.
The main reaction formula:
(1) roasting oxidation
Cr 2O 3+2Na 2CO 3+3O 2+△H=?2Na 2CrO 4+2CO 2+△H
(2) reduction and curing
Figure 481255DEST_PATH_IMAGE001
The neutralization of metal oxide
MO (metal oxide)+H 2SO 4→ MSO 4+ H 20
Figure 898592DEST_PATH_IMAGE002
The dissolving of solubility in acid chromium
2CaCrO 4?+?2H 2SO 4→2CaSO 4↓+?H 2Cr 2O 7?+?H 20
Chromic reduction and detoxication
CrO 4 2-+?3Fe 2++?8?H +→3?Fe 3+ +?Cr 3++?4H 20
4CrO 4 2-?+?3?S 2O 5 2-?+?14?H +→4Cr 3+?+?6SO 4 2-+?7H 20
Water-soluble chromic precipitation
Cr 3++30H -→Cr(0H) 3↓
Figure 2011101580918100002DEST_PATH_IMAGE005
Water-soluble ferric precipitation
Fe 3+ +?30H -→Fe(0H) 3↓
Figure 57151DEST_PATH_IMAGE006
The precipitation of excess sulfates
SO 4 2-?+?Ca 2+?+?CaSO 4↓
2. wet-type ball mill substitutes the leaching groove
Change original leaching groove into wet ball-milling and extract,, behind cooling kiln cooling kiln discharge, continue to be cooled to 90 through the grog of roasting oxidation 0Below the C, be transported in the ball mill hopper with the plate machine, add spray water, adjust the liquid-solid of material, the micro-dust of these generations and mist of chromic acid waste gas purify qualified discharge by the control of dust refining plant.And possess following characteristics:
Figure 571571DEST_PATH_IMAGE001
Increase substantially the leaching concentration and the leaching amount of Sodium chromate through conversion equipment, shorten the production cycle, reduce production costs. Production process realizes the processing wastewater zero release, the waste gas qualified discharge, and processing wastewater and detoxifcation back chromium slag all fully utilize.
Figure 993511DEST_PATH_IMAGE003
Improve Working environment, reduce working strength, reduce floor space, reduce the work hazard level.
3. plate-and-frame filter press substitutes the nature leaching
Behind the filter press washing dehydration, reduce water-soluble chromic content in the slag, remaining chromium cpd is about about 35% in the filter cake, water ratio about 20%.
This technology has solved a series of problems that above each technology worker chromium residue detoxifying takes place, and also has several characteristics: With roasting reduction is roasting oxidation, and improving trivalent chromium conversion is chromic transformation efficiency,
Figure 997163DEST_PATH_IMAGE002
During the discharging of dry method roasting reduction, it is chromic problem that trivalent chromium is met atmospheric oxidation;
Figure 542413DEST_PATH_IMAGE003
Make that trivalent chromium reacts completely in the slag under high temperature and strong oxidizer effect, be oxidized to chromic transformation efficiency height by trivalent chromium;
Figure 578765DEST_PATH_IMAGE004
Material is 90 0The material that enters below the C more than wet ball-milling to 200 order improves water-soluble chromic solubility rate through the buffering making beating, has a spot of mist of chromic acid here and produces, and adds dust suction and mist of chromic acid adsorption unit in charging place, and it is trace airborne dust when preventing and treating charging that this device plays one; The 2nd, absorption is removed grog 90 0The mist of chromic acid that the following wet ball-milling of C is produced carries out centralized collection and handles trace chromium acid mist qualified discharge, when adsorption liquid reaches capacity, can be used as the ball milling water or is transported between the chromium resource recovery vehicle as producing the chromium hydroxide mother liquor; The 3rd, to be uncontrollable discharge pollute and endanger phenomenon surrounding enviroment and personnel the too high mist of chromic acid of Yin Wendu in the former leaching process; Behind the filter press washing dehydration, reduce water-soluble chromic content in the slag, remaining chromium cpd is about about 35% in the filter cake, water ratio about 20%;
Figure 742079DEST_PATH_IMAGE006
Through the reaction aging jar remaining water-soluble sexavalent chrome is stirred the post precipitation supernatant liquor as the abrading-ball water, slip water-soluble and sour molten chromium filter cake dosing of residual about 0.5% in acidifying ageing reaction pair slip is cured, then use the filter press washing dehydration, enter detoxifcation back chromium slag muck and put the field, filtrate enters waste water processing station, handles to be used for the ball milling diffusion water after up to standard or to efflux.

Claims (4)

1. chromium slag roasting oxidation cleaning procedure that comprehensively detoxifies, it is characterized in that: with the chromium slag is raw material, chromite and soda ash are auxiliary material, material ratio: chromium slag: chromite: soda ash=2:1:0.6, in roasting temperature of reaction 1050 0C, chromium sesquioxide is generating Sodium chromate through the high-temperature roasting oxidation in the mixed material, transformation efficiency is more than 80%, wherein vat liquor makes to produce the mother liquor of sodium dichromate product, main technical process: supernatant liquor+acidifying curing+landfill or building materials are extracted in roasting oxidation+ball milling leaching+filter press dehydration+liquid production sodium dichromate+filter cake secondary making beating.
2. the chromium slag roasting oxidation according to claim 1 cleaning procedure that comprehensively detoxifies is characterized in that its processing step:
(1) roasting oxidation
Chromium slag, chromite and soda ash are auxiliary material, and the chromium slag is a raw material, replace rhombspar and Wingdale as auxiliary material again, mixed material chromium sesquioxide is generating Sodium chromate through the high-temperature roasting oxidation, and transformation efficiency is more than 80%, material ratio: chromium slag: chromite: soda ash=2:1:0.6, roasting temperature of reaction 1050 0C;
(2) ball milling leaching
Grog enters wet-type ball mill, and diffusion water is for being contained chromium underground water and secondary making beating supernatant liquor, and the slurry ball-milling temperature is 60～90 ℃;
Figure 636761DEST_PATH_IMAGE001
Utilize residual oxide further to carry out oxidizing reaction;
Utilize the friability and the grindability of grog, improve water-soluble chromic solubility rate, solid-to-liquid ratio is 1:2, and granularity is more than 200 orders, and water-soluble sexavalent chrome solubility rate is more than 65%;
(3) filter press dehydration
Washing dehydration, water-soluble sexavalent chrome solubility rate is more than 65%, liquid is as producing sodium dichromate mother liquor input production plant, dehydration back filter cake (water content about 20%);
(4) sodium dichromate is made
Press filtration liquid as producing sodium dichromate mother liquor input production plant, is produced sodium dichromate through concentrate, drying etc.;
(5) supernatant liquor is extracted in the making beating of filter cake secondary
Dehydration back filter cake is sized mixing to enter in water-soluble and sour molten jar through secondary and is carried out stripping and cure stage, the churning time of sizing mixing is 30min, the water-soluble of 30%-35% and solubility in acid sexavalent chrome are still arranged in the slip, through the water-soluble sexavalent chrome stripping of post precipitation, supernatant liquor returns ball mill as the ball milling water or as the mother liquor that reclaims chromium hydroxide;
(6) acidifying is solidified
Water-soluble chromium and sour molten chromium under the effect of sulfuric acid and ferrous sulfate through fully stirring the sour molten chromic acid stripping in back and carrying out ageing and react, after being reduced to trivalent chromium, be incorporated in the lattice, be fixed with harmful substances with stabilization medicament ferrous sulfate,, will be harmful to component and arrive with matrix bond by forming crystalline network and chemical bond, reduce the leaching toxicity of harmful component in the Hazardous wastes, reduce total chromium and total alkali in the chromium slag of detoxifcation back significantly, pH value 5～6, the reaction times is 12～20 h;
(7) landfill or building materials
Total chromium reduces significantly with total alkali in the chromium slag of detoxifcation back, improves security and the utilization ratio that dispose the back, can carry out landfill or production building materials safely after up to standard.
3. can carry out landfill or produce all kinds of building materials after the chromium slag after detoxifying is up to standard.
4. the chromium slag roasting oxidation according to claim 1 cleaning procedure that comprehensively detoxifies is characterized in that: utilize to contain chromium underground water and secondary making beating supernatant liquor as the ball milling diffusion water.
CN2011101580918A 2011-06-14 2011-06-14 Roasting oxidation comprehensive detoxification clean process of chromium slag Pending CN102285688A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102627329A (en) * 2012-04-27 2012-08-08 甘肃锦世化工有限责任公司 Method for improving chromium conversion rate of chromium salt rotary kiln by using calcium-free fillers
CN104030359A (en) * 2014-06-12 2014-09-10 甘肃锦世化工有限责任公司 Method for producing chromic salt calcium-free roasting filler with chromic hydroxide generated in chrome-containing wastewater treatment
CN110093496A (en) * 2019-05-10 2019-08-06 四川久远环境技术有限公司 A kind of ferrochrome dust resourcesization containing chromium powder utilize method
CN110586612A (en) * 2019-08-26 2019-12-20 北京高能时代环境技术股份有限公司 Harmless treatment method for co-processing incineration fly ash by using chromium slag
CN110683739A (en) * 2019-10-11 2020-01-14 重庆雅丽洁环保产业发展有限公司 Treatment process of chromium-containing waste residue
CN111139359A (en) * 2020-01-16 2020-05-12 湖北振华化学股份有限公司 Method for extracting chromium from chromium slag and pretreating chromium slag by acid leaching
CN115433836A (en) * 2022-10-09 2022-12-06 天津鑫科清洁环保技术开发有限公司 Method for producing industrial-grade chromium sesquioxide by clean utilization of chromium-containing sludge

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102627329A (en) * 2012-04-27 2012-08-08 甘肃锦世化工有限责任公司 Method for improving chromium conversion rate of chromium salt rotary kiln by using calcium-free fillers
CN104030359A (en) * 2014-06-12 2014-09-10 甘肃锦世化工有限责任公司 Method for producing chromic salt calcium-free roasting filler with chromic hydroxide generated in chrome-containing wastewater treatment
CN110093496A (en) * 2019-05-10 2019-08-06 四川久远环境技术有限公司 A kind of ferrochrome dust resourcesization containing chromium powder utilize method
CN110586612A (en) * 2019-08-26 2019-12-20 北京高能时代环境技术股份有限公司 Harmless treatment method for co-processing incineration fly ash by using chromium slag
CN110586612B (en) * 2019-08-26 2021-07-06 北京高能时代环境技术股份有限公司 Harmless treatment method for co-processing incineration fly ash by using chromium slag
CN110683739A (en) * 2019-10-11 2020-01-14 重庆雅丽洁环保产业发展有限公司 Treatment process of chromium-containing waste residue
CN110683739B (en) * 2019-10-11 2022-01-28 金涛 Treatment process of chromium-containing waste residue
CN111139359A (en) * 2020-01-16 2020-05-12 湖北振华化学股份有限公司 Method for extracting chromium from chromium slag and pretreating chromium slag by acid leaching
CN111139359B (en) * 2020-01-16 2022-02-25 湖北振华化学股份有限公司 Method for extracting chromium from chromium slag and pretreating chromium slag by acid leaching
CN115433836A (en) * 2022-10-09 2022-12-06 天津鑫科清洁环保技术开发有限公司 Method for producing industrial-grade chromium sesquioxide by clean utilization of chromium-containing sludge

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Application publication date: 20111221