CN103253710A - Process for producing sodium chromate from chromite through dissolution in acid and oxidization - Google Patents

Process for producing sodium chromate from chromite through dissolution in acid and oxidization Download PDF

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Publication number
CN103253710A
CN103253710A CN2013102135032A CN201310213503A CN103253710A CN 103253710 A CN103253710 A CN 103253710A CN 2013102135032 A CN2013102135032 A CN 2013102135032A CN 201310213503 A CN201310213503 A CN 201310213503A CN 103253710 A CN103253710 A CN 103253710A
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CN2013102135032A
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唐翔
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唐翔
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Abstract

The invention discloses a process for producing sodium chromate from chromite through dissolution in an acid and oxidization. The chromite is dissolved in an acid and thus oxidized into hexavalent chromium; and then the hexavalent chromium is extracted from the mixed solution to obtain the sodium chromate product, and meanwhile other chemical material components in the chromite can be extracted and prepared into a series of chemical products. The whole process flow has no slag discharged and causes no secondary pollution; and the whole process is clean, energy-saving and environment-friendly, so that the economic benefit and social benefit of an enterprise can be greatly improved.

Description

The molten chromite oxidation of acid Sodium chromate technology processed
Technical field
The present invention relates to the molten chromite oxidation of a kind of acid Sodium chromate technology processed, belonging to the chromite is raw material, and chromium becomes sexavalent chrome through adding sour dissolved oxygen, directly produces the technical field of Sodium chromate.
Background technology
Chromium salt production is since being born, general adopt several production methods: calcium roasting, few calcium roasting, calcium-free roasting, the inferior fused salt liquid phase oxidation style of potassium system, the tower continuous liquid phase oxidation of pneumatic fluidisation etc. are arranged, and these methods all are that to adopt with the chromite be that raw material is by roasting or add the alkali high-temperature oxidation and produce Sodium chromate.In fact all to have the shortcoming of a maximum be exactly that the chromium slag that produces of production process is handled difficult problem to all these methods of producing chromic salts.
The chromium quantity of slag that has the calcium roasting to produce is big, and environmental pollution is big, eliminates or bans use of.The chromium slag that no calcium or few calcium roasting produce, treatment process generally adopts: a part is returned the usefulness as the chromium salt production roasting, another part is used for ferrochrome production, and one ton of chromium slag of every processing just loses more than 1,000 yuan, also have the chromium slag muck that partly is untreated to put, the chromium quantity of slag of accumulating over a long period increases severely, and environment is caused tremendous influence.
The chromium slag that the inferior fused salt liquid phase oxidation style of potassium system, the tower continuous liquid phase oxidation of pneumatic fluidisation produce also needs to handle, and is used for smelting behind ferrochrome or the high-temperature detoxification as the usefulness of manufacture of cement additive, and treatment capacity is limited, have high input, highly energy-consuming easily produces secondary pollution to environment, and loss is big.
Disclosed Chinese invention patent " is produced the method for Sodium chromate " through calcium-free roasting by chromite, the patent No.: 200710017747.8, and publication number: CN101045559, open day: there was above problem in 2007.10.03.
Summary of the invention
The objective of the invention is to adopt a kind of novel chromium salt production method, reach the purpose of efficient, energy-conservation, cleaning, environmental protection, no slag, create best business economic benefit and social benefit.
Purpose of the present invention reaches by following measure:
The molten chromite oxidation of a kind of acid Sodium chromate technology processed, it is characterized in that, be that raw material adds sour dissolved oxygen and produces Sodium chromate with the chromite, and other material in the chromite is extracted direct production go out series chemical product, whole process flow does not have the slag discharging, the steps include:
1. chromite being pulverized is the 200-500 order, and adding hydrochloric acid, nitric acid, sulfuric acid, perchloric acid intensification chromic oxide become sexavalent chrome, adds water to make soluble substance become ion, and the solution metal ion is: Cr 6+, Fe 3+, AI 3+, Mg 2+, throw out is: Cr 2O 3, SiO 2, Fe 2O 3, AI 2O 3Mixture or Cr 2O 3, SiO 2Mixture or SiO 2
2. discharge solution adds hexavalent chromium-treatments agent: FeSO in the throw out 4, Na 2S 2O 5, Na 2SO 3, NaHSO 3, SO 2, H 2C 2O 4Add water and stir, filter, wash, drying makes product: Cr 2O 3, SiO 2, Fe 2O 3, AI 2O 3Mixture or Cr 2O 3, SiO 2Mixture or SiO 2
3. mixing solutions (Cr 6+, Fe 3+, AI 3+, Mg 2+) middle NaOH or KOH or the NH of adding 3.H 2O makes Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes Fe (OH) 3Product;
4. mixing solutions (Cr 6+, AI 3+, Mg 2+) middle NaOH or KOH or the NH of adding 3.H 2O makes AI 3+Be precipitated as AI (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes AI (OH) 3Product;
5. mixing solutions (Cr 6+, Mg 2+) the middle BaCI that adds 2Or Ba (OH) 2Or Ba (NO 3) 2Perhaps solubility lead salt or soluble calcium salt and calcium hydroxide make Cr 6+Be precipitated as BaCrO fully 4Perhaps PbCrO 4Perhaps CaCrO 4, discharge solution, throw out to be filtered, washs, drying makes BaCrO 4Perhaps PbCrO 4Perhaps CaCrO 4Product;
6. add NaOH or KOH or NH in the mixing solutions 3.H 2O makes Mg 2+Be precipitated as Mg (OH) fully 2, discharge solution, throw out to be filtered, washs, drying makes Mg (OH) 2Product;
7. filtrate centrifugal drying or crystallization makes product sodium salt or sylvite or ammonium salt;
8. with BaCrO 4Perhaps PbCrO 4Perhaps CaCrO 4The middle H that adds 2SO 4Dissolving generates BaSO 4Perhaps PbSO 4Perhaps CaSO 4Precipitation and H 2CrO 4Solution is discharged H 2CrO 4Solution filters, washs, and drying makes BaSO 4Perhaps PbSO 4Perhaps CaSO 4Product;
9.H 2CrO 4Solution crystallization or evaporation drying make products C r 2O 3, H 2CrO 4Add the NaOH complete reaction in the solution, crystallization or evaporation drying make Na 2CrO 4Product, Na 2CrO 4The middle sulfuric acid that adds makes product Na 2Cr 2O 7
10. contain sexavalent chrome Fe (OH) 3And AI (OH) 3Middle adding acid adds hexavalent chromium-treatments agent: FeSO again 4, Na 2S 2O 5, Na 2SO 3, NaHSO 3, SO 2, H 2C 2O 4Add water and stir, add NaOH or KOH or NH again 3.H 2O makes Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes Fe (OH) 3Product adds NaOH or KOH or NH in the solution 3.H 2O makes AI 3+Be precipitated as AI (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes AI (OH) 3Product.
Embodiment
In order to realize the feasibility of this invention, on October 20th, 2012, carry out implementation and operation:
1. get chromite 500kg and wear into 400 orders and put into reactor, added hydrochloric acid, nitric acid, sulfuric acid mixed solution 1100kg stirring reaction 2.5 hours, add perchloric acid 58kg and be heated to and smolder, stop heating, cooling;
2. add 3000kg water stirring and dissolving, filter, add the hexavalent chromium-treatments agent in the filter residue, washing, drying make mixture 45kg;
3. add 98%NaOH in the yellow filtrate, make Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, with throw out filtration, washing, drying, make product F e (OH) 3110kg;
4. add 98%NaOH in the filtrate and make AI 3+Be precipitated as AI (OH) fully 3, discharge solution, with throw out filtration, washing, drying, make product A I (OH) 3116kg;
5. add BaCI in the filtrate 21050kg stirs, and makes Cr 6+Be precipitated as BaCrO fully 4, discharge solution, with throw out filtration, washing, drying, make product B aCrO 4660kg;
6. add 98%NaOH in the filtrate and make Mg 2+Be precipitated as Mg (OH) fully 2, discharge solution, with throw out filtration, washing, drying, make product Mg (OH) 289kg;
7. with BaCrO 4The middle H that adds 2SO 4Dissolving generates BaSO 4Precipitation is discharged solution (H 2CrO 4), with throw out filtration, washing, drying, make product B aSO 4590kg;
8. (H in the filtrate 2CrO 4) add the 99.5%NaOH complete reaction, solution is put into spray-dryer carry out drying, make product Na 2CrO 4510kg;
9. contain sexavalent chrome Fe (OH) 3And AI (OH) 3Middle adding acid, the agent of adding hexavalent chromium-treatments adds the water stirring and adds 98%NaOH again, makes Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, with throw out filtration, washing, drying, make product F e (OH) 3109.8kg, add NaOH or KOH or NH in the solution 3.H 2O makes AI 3+Be precipitated as AI (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes AI (OH) 3Product 115.6kg.
Facts have proved that this invents whole chrominm salt production technology flow process, chromite utilization ratio height, the chemical substance in the chromite is directly extracted produces series chemical product, quality better, be worth high, the huge market demand.The less investment low power consuming, production process non-secondary pollution, no slag discharging, cleaning, energy-saving and environmental protection.Have good practicability and feasibility, good economic benefit, environmental benefit and social benefit are arranged.

Claims (10)

  1. The molten chromite oxidation of a kind of acid Sodium chromate technology processed, it is characterized in that, be that raw material adds sour dissolved oxygen and produces Sodium chromate with the chromite, and other material in the chromite is extracted direct production go out series chemical product, whole process flow does not have the slag discharging, the steps include:
    1. chromite being pulverized is the 200-500 order, and adding hydrochloric acid, nitric acid, sulfuric acid, perchloric acid intensification chromic oxide become sexavalent chrome, adds water to make soluble substance become ion, and the solution metal ion is: Cr 6+, Fe 3+, AI 3+, Mg 2+, throw out is: Cr 2O 3, SiO 2, Fe 2O 3, AI 2O 3Mixture or Cr 2O 3, SiO 2Mixture or SiO 2
  2. 2. discharge solution adds hexavalent chromium-treatments agent: FeSO in the throw out 4, Na 2S 2O 5, Na 2SO 3, NaHSO 3, SO 2, H 2C 2O 4Add water and stir, filter, wash, drying makes product: Cr 2O 3, SiO 2, Fe 2O 3, AI 2O 3Mixture or Cr 2O 3, SiO 2Mixture or SiO 2
  3. 3. mixing solutions (Cr 6+, Fe 3+, AI 3+, Mg 2+) middle NaOH or KOH or the NH of adding 3.H 2O makes Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes Fe (OH) 3Product;
  4. 4. mixing solutions (Cr 6+, AI 3+, Mg 2+) middle NaOH or KOH or the NH of adding 3.H 2O makes AI 3+Be precipitated as AI (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes AI (OH) 3Product;
  5. 5. mixing solutions (Cr 6+, Mg 2+) the middle BaCI that adds 2Or Ba (OH) 2Or Ba (NO 3) 2Perhaps solubility lead salt or soluble calcium salt and calcium hydroxide make Cr 6+Be precipitated as BaCrO fully 4Perhaps PbCrO 4Perhaps CaCrO 4, discharge solution, throw out to be filtered, washs, drying makes BaCrO 4Perhaps PbCrO 4Perhaps CaCrO 4Product;
  6. 6. add NaOH or KOH or NH in the mixing solutions 3.H 2O makes Mg 2+Be precipitated as Mg (OH) fully 2, discharge solution, throw out to be filtered, washs, drying makes Mg (OH) 2Product;
  7. 7. filtrate centrifugal drying or crystallization makes product sodium salt or sylvite or ammonium salt;
  8. 8. with BaCrO 4Perhaps PbCrO 4Perhaps CaCrO 4The middle H that adds 2SO 4Dissolving generates BaSO 4Perhaps PbSO 4Perhaps CaSO 4Precipitation and H 2CrO 4Solution is discharged H 2CrO 4Solution filters, washs, and drying makes BaSO 4Perhaps PbSO 4Perhaps CaSO 4Product;
  9. 9.H 2CrO 4Solution crystallization or evaporation drying make products C r 2O 3, H 2CrO 4Add the NaOH complete reaction in the solution, crystallization or evaporation drying make Na 2CrO 4Product, Na 2CrO 4The middle sulfuric acid that adds makes product Na 2Cr 2O 7
  10. 10. contain sexavalent chrome Fe (OH) 3And AI (OH) 3Middle adding acid adds hexavalent chromium-treatments agent: FeSO again 4, Na 2S 2O 5, Na 2SO 3, NaHSO 3, SO 2, H 2C 2O 4Add water and stir, add NaOH or KOH or NH again 3.H 2O makes Fe 3+Be precipitated as Fe (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes Fe (OH) 3Product adds NaOH or KOH or NH in the solution 3.H 2O makes AI 3+Be precipitated as AI (OH) fully 3, discharge solution, throw out to be filtered, washs, drying makes AI (OH) 3Product.
CN2013102135032A 2012-05-31 2013-05-28 Process for producing sodium chromate from chromite through dissolution in acid and oxidization CN103253710A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104418385A (en) * 2013-08-31 2015-03-18 唐翔 Process for preparing chromate employing ferrochrome acid solution-phase oxidation method
CN104556227A (en) * 2013-08-29 2015-04-29 唐翔 Technology for preparing chromate by carbon ferrochrome liquid-phase oxidation
CN104743510A (en) * 2013-12-29 2015-07-01 唐翔 Carbon ferrochrome liquid phase method for preparing new energy battery raw material and new energy source hydrogen process
CN105016388A (en) * 2014-04-17 2015-11-04 唐翔 Clean, energy-saving and environment-friendly chromium compound manufacturing technology by utilizing carbon ferrochrome
CN105084419A (en) * 2014-05-13 2015-11-25 唐翔 One-off manufacturing technology of chromium compounds and new products in many industries by liquid phase method of ferrochromium
CN105314679A (en) * 2014-07-28 2016-02-10 唐翔 Process for preparing chromic anhydride and dichromate by carbon ferrochrome liquid phase method
CN108754161A (en) * 2018-07-30 2018-11-06 中南大学 A kind of method of containing vanadium and chromium acid salt solution separation and recovery chromium

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102718261A (en) * 2012-05-31 2012-10-10 唐翔 Process for preparing sodium chromate by acid dissolution and oxidation of chromite
CN104843790B (en) * 2015-05-22 2016-11-30 四川省银河化学股份有限公司 A kind of chromite oxidizing method preparing sodium chromate of acid
CN107973345B (en) * 2016-10-21 2019-07-23 中国科学院过程工程研究所 A method of improving sodium chromate separative efficiency in NaOH medium

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CN101974688A (en) * 2010-10-19 2011-02-16 东北大学 Method for separating chromium ions and iron ions in multicomponent solution
CN102718261A (en) * 2012-05-31 2012-10-10 唐翔 Process for preparing sodium chromate by acid dissolution and oxidation of chromite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101974688A (en) * 2010-10-19 2011-02-16 东北大学 Method for separating chromium ions and iron ions in multicomponent solution
CN102718261A (en) * 2012-05-31 2012-10-10 唐翔 Process for preparing sodium chromate by acid dissolution and oxidation of chromite

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104556227A (en) * 2013-08-29 2015-04-29 唐翔 Technology for preparing chromate by carbon ferrochrome liquid-phase oxidation
CN104418385A (en) * 2013-08-31 2015-03-18 唐翔 Process for preparing chromate employing ferrochrome acid solution-phase oxidation method
CN104743510A (en) * 2013-12-29 2015-07-01 唐翔 Carbon ferrochrome liquid phase method for preparing new energy battery raw material and new energy source hydrogen process
CN104743510B (en) * 2013-12-29 2017-08-25 唐翔 Carbon ferrochrome liquid phase method manufactures new energy battery material and new energy hydrogen technique
CN105016388A (en) * 2014-04-17 2015-11-04 唐翔 Clean, energy-saving and environment-friendly chromium compound manufacturing technology by utilizing carbon ferrochrome
CN105016388B (en) * 2014-04-17 2019-02-19 唐翔 The environmentally protective manufacture chromium compound technique of carbon ferrochrome clean energy-saving
CN105084419A (en) * 2014-05-13 2015-11-25 唐翔 One-off manufacturing technology of chromium compounds and new products in many industries by liquid phase method of ferrochromium
CN105314679A (en) * 2014-07-28 2016-02-10 唐翔 Process for preparing chromic anhydride and dichromate by carbon ferrochrome liquid phase method
CN105314679B (en) * 2014-07-28 2019-04-09 唐翔 Carbon ferrochrome liquid phase method produces chromic anhybride and bichromate technique
CN108754161A (en) * 2018-07-30 2018-11-06 中南大学 A kind of method of containing vanadium and chromium acid salt solution separation and recovery chromium

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