CN101817561B - Method for pollution-free production of sodium chromate by pressure leaching of chromite - Google Patents

Method for pollution-free production of sodium chromate by pressure leaching of chromite Download PDF

Info

Publication number
CN101817561B
CN101817561B CN2010101466481A CN201010146648A CN101817561B CN 101817561 B CN101817561 B CN 101817561B CN 2010101466481 A CN2010101466481 A CN 2010101466481A CN 201010146648 A CN201010146648 A CN 201010146648A CN 101817561 B CN101817561 B CN 101817561B
Authority
CN
China
Prior art keywords
sodium chromate
chromite
solution
naoh
pollution
Prior art date
Application number
CN2010101466481A
Other languages
Chinese (zh)
Other versions
CN101817561A (en
Inventor
徐红彬
石义朗
张懿
蔡再华
李佐虎
程西川
张小飞
陈小红
张洋
刘静文
Original Assignee
湖北振华化学股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 湖北振华化学股份有限公司 filed Critical 湖北振华化学股份有限公司
Priority to CN2010101466481A priority Critical patent/CN101817561B/en
Publication of CN101817561A publication Critical patent/CN101817561A/en
Application granted granted Critical
Publication of CN101817561B publication Critical patent/CN101817561B/en

Links

Abstract

The invention belongs to the field of chromite hydrometallurgy and chromium chemical industry, and in particular relates to a method for the pollution-free production of sodium chromate by pressure leaching of chromite. The method comprises the following steps of: 1) reacting the chromite with oxidizing gas in solution of NaOH; 2) diluting the product obtained by the step 1) and making subcrystalline sodium chromate to fully enter a liquid phase; 3) performing solid-liquid separation on the solid-liquid mixed slurry obtained by the step 2); 4) adding calcium oxide into the obtained diluent for removing impurities; and 5) evaporating and crystallizing the obtained solution without the impurities to obtain a sodium chromate crystal and crystallization mother solution; after the solid-liquid separation, rinsing the sodium chromate crystal by using saturated solution of sodium chromate; and drying to obtain a qualified sodium chromate product. The method has the advantages of simple reaction system component, no difficultly separated phase introduced in the system, contribution to high-efficiency separation of the sodium chromate, great reduction in reaction temperature, low energy consumption, effective reduction in production cost of the sodium chromate, and high chromium leaching yield.

Description

A kind of method of pollution-free production of sodium chromate by pressure leaching of chromite
Technical field
The invention belongs to chromite hydrometallurgy and chromaking worker field, particularly a kind of method of pollution-free production of sodium chromate by pressure leaching of chromite.
Background technology
Sodium chromate-51Cr is important industriallization chemical product, is the requisite of producing other chromium cpds.Chromite is the direct sources of producing Sodium chromate-51Cr.
Chromite in becoming the ore deposit process, chromium and other metallic elements formed the chromohercynite structure ((Mg, Fe) (Cr, Al) 2O 4).This feasible method with mechanical ore grinding and ore dressing is difficult to make chromium to separate.The existing method with chromite production Sodium chromate-51Cr of China has mainly contained calcium roasting method and calcium-free roasting method.Chromite uses traditional when having calcium roasting method technology to smelt, and the chromium transformation efficiency is low, be merely about 75%, and bed drain purge is big, content of 6-valence Cr ions is high in the slag, and environmental pollution is serious; Optimize the calcium-free roasting method that tradition has the calcium roasting method to form, compare with the calcium roasting method is arranged, it is low that the chromium leaching yield is high, bed drain purge is little, slag contains sexavalent chrome; But facility investment is big; The body of heater ring formation is serious in the roasting process, and now u.s.a. and japan can industriallization, but the domestic heavy industrialization of still being unrealized.
In recent years, Chinese Academy Of Sciences Process Engineering Research Institute has made big quantity research to the liquid phase method process for cleanly preparing of chromic salts, has developed sub-molten salt method and molten-salt growth method series chromium-salt clean production process.CN1410358 utilizes the KOH fused salt under the effect of oxygenant, and chromite is decomposed in liquid-phase oxidation, and transformation efficiency is high, and bed drain purge is little.At present, this technology has been built up the ton demonstration project.But the finished product of this technology are chromic oxide, can't satisfy the requirement of market to the Sodium chromate-51Cr series product.CN1226512 replaces KOH with NaOH, has specifically introduced NaOH fused salt liquid phase oxygenolysis chromite and has produced the Sodium chromate-51Cr cleaning procedure.This method is used the NaOH fused salt, and alkali ore deposit ratio is 3: 1~6: 1, and the NaOH temperature of molten salt is 500~550 ℃, and the reaction times is 6 hours, and the crystallization of dilution postcooling obtains the mixed crystal of Sodium chromate-51Cr and sodium aluminate, further separates Sodium chromate-51Cr and sodium aluminate again.The shortcoming of this method is to use the NaOH fused salt to require temperature of reaction high, need evaporate during the recycle of dilution alkali lye and put forward highly basic concentration, and energy consumption is high; Concentration of lye after the dilution is still very high, and soltion viscosity is big, and solid-liquid separation is difficult; And under the high temperature high alkali environment, equipment corrosion is serious; And the mixed crystal that obtains needs further to separate, and technical process is long.
In order to solve the deficiency of CN1226512, CN101659444 has proposed in system, to have added NaNO 3To replace the technology of part NaOH.This technological reaction temperature is 280~400 ℃, and transformation efficiency contains the chromium rate less than 0.5% greater than 99% in the slag; NaNO in system 3Only as catalysts, self does not consume.But the weak point of this technology is to have introduced NaNO 3, make Na 2CrO 4The crystalline extraction process is complicated, difficulty is big; And SODIUMNITRATE is prone to resolve into Sodium Nitrite in reaction process, and is difficult to remove, and makes the industriallization of this technology receive very big constraint.Along with the progress of Materials science, the development of metallurgical equipment needs a kind ofly more to optimize, efficiently with the process for cleanly preparing of preparing sodium chromate from chromite.
Summary of the invention
Therefore, to the weak point of above-mentioned prior art, what provide is a kind of according to the chromite mineralogical character just for the object of the invention, chromite is pressurizeed leach the method for producing Sodium chromate-51Cr.
Principle of the present invention be chromite in autoclave, react at 180~320 ℃ with certain density NaOH solution, oxidizing gas, make trivalent chromium be oxidized to sexavalent chrome and generate Sodium chromate-51Cr, the chemical reaction that wherein relates to has:
Sodium chromate-51Cr clean preparation method of the present invention is: chromite is oxygenolysis in NaOH solution and oxidizing atmosphere, makes chromium with Na 2CrO 4Form get into solution, the dilution after-filtration is removed tailings, carries out evaporative crystallization again and obtains the Sodium chromate-51Cr product.
Method according to pollution-free production of sodium chromate by pressure leaching of chromite of the present invention may further comprise the steps:
1) chromite carries out the heated oxide reaction with oxidizing gas in NaOH solution, and the concentration of NaOH is 30%wt~80%wt, and the mass ratio of NaOH and chromite is 2: 1~10: 1, obtains containing Na after the reaction 2CrO 4, solution and the rich iron tailings of NaOH and other water-soluble impurity, the solidliquid mixture of crystals of sodium chromate;
2) dilution step 1) product that obtains, make the Sodium chromate-51Cr of partial crystallization all get into liquid phase, obtain containing NaOH, Na 2CrO 4And the solution of water-soluble impurity component and the solid-liquid mixed slurry of rich iron tailings;
3) with step 2) the solid-liquid mixed slurry that obtains carries out solid-liquid separation, and obtain rich iron tailings respectively and contain NaOH, Na 2CrO 4And the diluting soln of water-soluble impurity component;
4) in the diluent that step 3) obtains, add the quicklime removal of impurities, obtain removal of impurities liquid and calcic waste residue after the solid-liquid separation;
5) the removal of impurities solution evaporation crystallization that step 4) is obtained obtains crystals of sodium chromate and crystalline mother solution, and crystals of sodium chromate can obtain qualified Sodium chromate-51Cr product with saturated chromium acid sodium solution drip washing after the solid-liquid separation after drying.
Method according to pollution-free production of sodium chromate by pressure leaching of chromite of the present invention; Wherein, Said step also comprises the step that rich iron tailings that step 3) is obtained carries out the multi-stage countercurrent washing with clear water, therefore, can be with clear water or the above-mentioned washings dilution step 1 that obtains) product that obtains.
According to the method for pollution-free production of sodium chromate by pressure leaching of chromite of the present invention, wherein, said step also comprises after the crystalline mother solution that step 5) is obtained is transferred alkali returns the oxygenolysis that step 1) is used for chromite.
According to the method for pollution-free production of sodium chromate by pressure leaching of chromite of the present invention, preferably, the temperature of reaction of the oxidizing reaction in the step 1) is 180 ℃~320 ℃.
According to the method for pollution-free production of sodium chromate by pressure leaching of chromite of the present invention, preferably, the reaction times of the oxidizing reaction in the step 1) is 0.5~10.0 hour.
According to the method for pollution-free production of sodium chromate by pressure leaching of chromite of the present invention, preferably, in step 1), the dividing potential drop of oxidizing gas is 0.1MPa~5.0MPa,
According to the method for pollution-free production of sodium chromate by pressure leaching of chromite of the present invention, wherein, in step 1), said oxidizing gas is air, oxygen, oxygen-rich air, ozone and composition thereof.
Therefore, according to a particular embodiment of the invention the method for pollution-free production of sodium chromate by pressure leaching of chromite can may further comprise the steps:
1) chromite reacts with oxidizing gas in certain density NaOH solution; Said oxidizing gas can be air, oxygen, oxygen-rich air, ozone and composition thereof, and the oxygen during reaction or the dividing potential drop of other oxidizing gas are 0.1MPa~5.0MPa, and the mass ratio of NaOH and chromite is 2: 1~10: 1; The concentration of NaOH is 30%wt~80%wt; The temperature of reaction is 180 ℃~320 ℃, and the time of reaction is 0.5~10.0 hour, obtains containing Na after the reaction 2CrO 4, solution and the rich iron tailings of NaOH and other water-soluble impurity, the solidliquid mixture that crystals of sodium chromate forms;
2) product that step 1) is obtained is with clear water or following steps 4) the washings dilution that obtains, make the Sodium chromate-51Cr of partial crystallization all get into liquid phase, obtain containing NaOH, Na 2CrO 4And the solution of water-soluble impurity component and the solid-liquid mixed slurry of rich iron tailings;
3) with step 2) the solid-liquid mixed slurry that obtains carries out solid-liquid separation, and obtain rich iron tailings respectively and contain NaOH, Na 2CrO 4And the solution of water-soluble impurity component;
4) the rich iron tailings that obtains of step 3) is with the washing of clear water multi-stage countercurrent, and washings can be used as step 2) dilution;
5) diluent that step 3) is obtained adds the quicklime removal of impurities, obtains removal of impurities liquid and calcic waste residue after the solid-liquid separation;
6) contain NaOH, Na with what step 5) obtained 2CrO 4Deng the solution evaporation crystallization, obtain crystals of sodium chromate and crystalline mother solution, crystals of sodium chromate can obtain qualified Sodium chromate-51Cr product with saturated chromium acid sodium solution drip washing after the solid-liquid separation after drying;
7) after transferring alkali, the crystalline mother solution that step 6) is obtained returns the oxygenolysis that step (1) is used for chromite.
The present invention proposes the cleaning procedure of pressurization leaching chromite production Sodium chromate-51Cr in autoclave, compare, obvious superiority is arranged with domestic and international existing working method:
See from reaction system that 1, the leach liquor composition is simple, do not introduce the difficult phase of separating in the system, in reaction and leaching process, the water-soluble by product of generation is sodium aluminate, water glass, yellow soda ash, can add quicklime and remove, and helps the high efficiency separation of Sodium chromate-51Cr.
See from reaction conditions that 2, compare with traditional technology, temperature of reaction reduces greatly, energy consumption is little, effectively reduces the production cost of Sodium chromate-51Cr.
3, this invention chromium leaching yield is high, can reach more than 99%, and bed drain purge is little, and slag toxic content of 6-valence Cr ions is low, and the slag staple is a red oxide of iron, realizes comprehensive utilization more easily.
4, the waste of this technology NaOH is little, only needs to buy small amount of alkali and just can meet the needs of production.
5, this technology self can realize the balance of water, and this technology both can be founded the factory separately, also can calcium sinter process, calcium-free roasting technology, liquid phase production technology be arranged with tradition and deposits, and is fit to that old factory transforms and the side area is newly-built separately.
6, this technology both can be founded the factory separately, also can calcium sinter process, calcium-free roasting technology, liquid phase production technology be arranged with tradition and deposited, and was fit to that old factory transforms and the side area is newly-built separately.
Description of drawings
Fig. 1 is the schematic flow sheet of method of the present invention
Embodiment
Embodiment 1
In autoclave, add the NaOH solution of chromite and 30%, alkali ore deposit ratio is 10: 1, is heated to 300 ℃; Bubbling air in solution then, and stir, chromite is fully contacted with oxygen; Hierarchy of control total pressure is 8MPa, is incubated 10 hours, and chromite and oxygen are fully reacted.Finally obtain containing NaOH and Na 2CrO 4Deng solution, crystals of sodium chromate and rich iron tailings, the transformation efficiency of principal element chromium is more than 99% in the chromite.Add the clear water diluted reaction mixture, solid-liquid separation obtains rich iron tailings and contains Na then 2CrO 4, NaOH etc. solution.With after adding an amount of quicklime removal of impurities in the solution, evaporative crystallization obtains crystals of sodium chromate again.Crystals of sodium chromate promptly obtains purity at the Sodium chromate-51Cr product more than 99% after saturated chromium acid sodium solution drip washing and drying.Rich iron tailings can be used as the ferrous metallurgy raw material after the washing of three stage countercurrents.
Embodiment 2
In autoclave, add the NaOH solution of chromite and 50wt%, alkali ore deposit ratio is 6: 1, is heated to 280 ℃; Aerating oxygen in solution then, and stir, chromite is fully contacted with oxygen; Hierarchy of control total pressure is 6MPa, is incubated 8 hours, and chromite and oxygen are fully reacted.Finally obtain containing NaOH and Na 2CrO 4Deng solution, crystals of sodium chromate and rich iron tailings, the transformation efficiency of principal element chromium is more than 99% in the chromite.Add the clear water diluted reaction mixture, solid-liquid separation obtains rich iron tailings and contains Na then 2CrO 4, NaOH etc. solution, subsequent technique is with embodiment 1.
Embodiment 3
In autoclave, add the NaOH solution of chromite and 80wt%, alkali ore deposit ratio is 2: 1; Be heated to 200 ℃, in solution, feed ozone then, and stir; Chromite is fully contacted with ozone; Hierarchy of control total pressure is 0.5MPa, is incubated 0.5 hour, and chromite and ozone are fully reacted.Finally obtain containing NaOH and Na 2CrO 4Deng solution, crystals of sodium chromate and rich iron tailings, the transformation efficiency of principal element chromium is more than 99% in the chromite.Add the rich iron tailings washings diluted reaction mixture that obtains among the embodiment 2, solid-liquid separation obtains rich iron tailings and contains Na2CrO then 4, NaOH etc. solution, subsequent technique is with embodiment 1.
Embodiment 4
In autoclave, add chromite, 55wt%NaOH solution and Sodium chromate-51Cr, alkali ore deposit ratio is 4: 1; Be heated to 260 ℃, aerating oxygen in solution then, and stir; Chromite is fully contacted with oxygen; Hierarchy of control total pressure is 4MPa, is incubated 6 hours, and chromite and oxygen are fully reacted.Finally obtain containing NaOH and Na 2CrO 4Deng solution, crystals of sodium chromate and rich iron tailings, the transformation efficiency of principal element chromium is more than 99% in the chromite.With solid-liquid separation behind the clear water diluted reaction mixture, obtain rich iron tailings and contain Na 2CrO 4, NaOH etc. solution, subsequent technique is with embodiment 1.
Embodiment 5
Circulation turns back to the evaporative crystallization mother liquor of reaction kettle, behind the benefit alkali, adds chromite; Alkali ore deposit ratio is 4: 1, is heated to 260 ℃, then aerating oxygen in solution; And stir, chromite is fully contacted with oxygen, hierarchy of control total pressure is 4.5MPa; Be incubated 5 hours, chromite and oxygen are fully reacted.Reaction conversion ratio is more than 99%.With carrying out solid-liquid separation behind the rich iron tailings washings diluted reaction mixture that obtains among the embodiment 4, obtain rich iron tailings and contain Na 2CrO 4, NaOH etc. solution, subsequent technique is with embodiment 1.

Claims (7)

1. the method for a pollution-free production of sodium chromate by pressure leaching of chromite is characterized in that, said method comprising the steps of:
1) chromite carries out the heated oxide reaction with oxidizing gas in NaOH solution, and the concentration of NaOH is 30%wt~80%wt, and the mass ratio of NaOH and chromite is 2: 1~10: 1, obtains containing Na after the reaction 2CrO 4, solution and the rich iron tailings of NaOH and other water-soluble impurity, the solidliquid mixture of crystals of sodium chromate;
2) dilution step 1) product that obtains, make the Sodium chromate-51Cr of partial crystallization all get into liquid phase, obtain containing NaOH, Na 2CrO 4And the solution of water-soluble impurity component and the solid-liquid mixed slurry of rich iron tailings;
3) with step 2) the solid-liquid mixed slurry that obtains carries out solid-liquid separation, and obtain rich iron tailings respectively and contain NaOH, Na 2CrO 4And the diluting soln of water-soluble impurity component;
4) in the diluent that step 3) obtains, add the quicklime removal of impurities, obtain removal of impurities liquid and calcic waste residue after the solid-liquid separation;
5) the removal of impurities solution evaporation crystallization that step 4) is obtained obtains crystals of sodium chromate and crystalline mother solution, and crystals of sodium chromate can obtain qualified Sodium chromate-51Cr product with saturated chromium acid sodium solution drip washing after the solid-liquid separation after drying;
The temperature of reaction of the oxidizing reaction in the said step 1) is 180 ℃~320 ℃;
The dividing potential drop of oxidizing gas is 0.1MPa~5.0MPa in the said step 1).
2. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 1 is characterized in that, said step comprises that also the rich iron tailings that step 3) is obtained carries out the step that multi-stage countercurrent washs with clear water.
3. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 1 is characterized in that, said step also comprises after the crystalline mother solution that step 5) is obtained is transferred alkali returns the oxygenolysis that step 1) is used for chromite.
4. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 1 is characterized in that, in said step 2) in, the washings dilution step 1 that obtains with clear water or claim 2) product that obtains.
5. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 1 is characterized in that, the reaction times of the oxidizing reaction in the step 1) is 0.5~10.0 hour.
6. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 1 is characterized in that, in step 1), said oxidizing gas is air, oxygen, ozone and composition thereof.
7. the method for pollution-free production of sodium chromate by pressure leaching of chromite according to claim 6 is characterized in that, said air is an oxygen-rich air.
CN2010101466481A 2010-04-12 2010-04-12 Method for pollution-free production of sodium chromate by pressure leaching of chromite CN101817561B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010101466481A CN101817561B (en) 2010-04-12 2010-04-12 Method for pollution-free production of sodium chromate by pressure leaching of chromite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010101466481A CN101817561B (en) 2010-04-12 2010-04-12 Method for pollution-free production of sodium chromate by pressure leaching of chromite

Publications (2)

Publication Number Publication Date
CN101817561A CN101817561A (en) 2010-09-01
CN101817561B true CN101817561B (en) 2012-05-30

Family

ID=42652865

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010101466481A CN101817561B (en) 2010-04-12 2010-04-12 Method for pollution-free production of sodium chromate by pressure leaching of chromite

Country Status (1)

Country Link
CN (1) CN101817561B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102531056B (en) * 2012-01-09 2014-11-05 中国科学院过程工程研究所 Method for cleaner production of sodium vanadate and sodium chromate by pressure leaching of vanadium slag
CN103449522B (en) * 2012-06-01 2016-03-09 中国科学院过程工程研究所 A kind of chromium residue produces the method for chromic salt
CN103060838B (en) * 2012-12-29 2015-12-23 中国科学院过程工程研究所 In a kind of potassium hydroxide solution, electrochemical decomposition chromite extracts the method for chromium
CN103183384B (en) * 2013-03-29 2016-08-10 中国科学院过程工程研究所 The method that a kind of preroast strengthening sub-molten salt decomposes chromite
CN104341004A (en) * 2013-07-25 2015-02-11 中国科学院过程工程研究所 New process for preparing potassium chromate through pressurization leaching on chromite
CN104512931B (en) * 2013-09-30 2017-10-10 湖北振华化学股份有限公司 Pressurization liquid phase oxidation chromite decomposition method and the device for liquid phase oxidation chromite decomposition of pressurizeing
CN104512930A (en) * 2013-09-30 2015-04-15 湖北振华化学股份有限公司 Method for producing chromate by liquid-phase catalytic oxidation of chromite
CN104726705B (en) * 2013-12-23 2017-06-06 中国科学院过程工程研究所 A kind of chromite leaches the method for carrying chromium
CN104760997A (en) * 2015-03-05 2015-07-08 重庆民丰化工有限责任公司 Production method of sodium chromate with alkali liquid circulation and liquid phase oxidization
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
CN105366724B (en) * 2015-12-24 2017-04-05 四川省银河化学股份有限公司 A kind of method of sodium cyclic production chrome oxide green
CN106186068B (en) * 2016-07-06 2018-10-26 于广新 A kind of Continuous Liquid Phase oxidation prepares the clean preparation method of chromate
CN107902699B (en) * 2017-11-14 2019-09-27 中国科学院过程工程研究所 A kind of decomposition method of continuous pressure self-heating liquid phase oxidation chromite
CN110947319B (en) * 2019-12-16 2020-12-08 重庆理工大学 Dynamic and static combined stirring system and process for preparing chromium salt through chromite liquid-phase oxidation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066734A (en) * 1975-09-20 1978-01-03 Bayer Aktiengesellschaft Alkaline disintegration of chromites
CN101481144A (en) * 2008-01-09 2009-07-15 中国科学院过程工程研究所 Clean production method for preparing potassium chromate from chromic iron

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7968066B2 (en) * 2003-03-19 2011-06-28 Institute Of Process Engineering Chinese Academy Of Sciences Method for production of alkali metal chromates

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066734A (en) * 1975-09-20 1978-01-03 Bayer Aktiengesellschaft Alkaline disintegration of chromites
CN101481144A (en) * 2008-01-09 2009-07-15 中国科学院过程工程研究所 Clean production method for preparing potassium chromate from chromic iron

Also Published As

Publication number Publication date
CN101817561A (en) 2010-09-01

Similar Documents

Publication Publication Date Title
CN106129511A (en) A kind of method of comprehensively recovering valuable metal from waste and old lithium ion battery material
CN101643243B (en) Method for recycling copper, nickel, chromium, zinc and iron from plating sludge
CN103757425B (en) A kind of clean process method being produced vanadic acid sodium and chromium acid sodium alkaline liquid by high chrome alum slag
CN104357660B (en) A kind of method cleaning production vanadic anhydride
CN102531002B (en) Method for purifying lithium carbonate
CN102851693B (en) Technology for recovering production of electrolytic copper and zinc from smelting ash
CN104659438B (en) A kind of method that utilization refuse battery prepares ternary anode material precursor
CN102219257B (en) Method for preparing vanadium pentoxide
CN104911364A (en) Environment-friendly and high-efficiency production method of antimony white by using Sb and As-containing ash
CN105271632B (en) A kind of method of electroplating sludge synthetical recovery
CN104109758A (en) Clean process method for extracting vanadium, chromium and iron from vanadium slag step by step
CN101451199B (en) Method for extracting vanadic anhydride from stone coal vanadium ore
CN107188149B (en) A kind of technique of LITHIUM BATTERY high-purity nm ferric phosphate
CN102002585B (en) Method for producing vanadium iron with stone-like coal pickle liquor
CN102276099B (en) Comprehensive treatment method of waste water from laterite-nickel ore wet smelting
CN101760651B (en) Process for extracting vanadium by acid leaching of stone coal
CN101289702B (en) Process for separating molybdenum and nickel form black shale containing molybdenum and nickel
CN102390819B (en) Method for preparing tellurium dioxide from tellurium slag
CN102363522B (en) Technology for extracting selenium from low-grade selenium-containing material
CN104876250B (en) Method for extracting lithium and removing aluminum by treating lepidolite with sulfuric acid
CN102094119A (en) Method for preparing electrolytic manganese metal with low-grade pyrolusite wet leaching
CN102011010A (en) Method for totally extracting vanadium, gallium and scandium by using titanium dioxide hydrolysis waste acid to leach steel slag containing vanadium
CN101265524B (en) Method for extracting V2O5 from stone coal
CN102206755B (en) Method for separating and recovering valuable elements from neodymium-iron-boron wastes
CN101186968A (en) Method for producing refined lithium sulfate solution used in lepidolite lithium-extracting technique by sulfuric acid process

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: HUANGSHI ZHENHUA CHEMICAL INDUSTRY CO., LTD.

Free format text: FORMER OWNER: INST. OF PROCESS ENGRG., CHINESE ACADEMY OF SCIENCES

Effective date: 20111208

TA01 Transfer of patent application right

Effective date of registration: 20111208

Address after: 435001 Huangshi city of Hubei province xisaishanqu Cisse Street Office of Liangshan Village

Applicant after: Huangshi Zhenhua Chemical Industry Co., Ltd.

Address before: 100190 Beijing, Zhongguancun, north of No. two, No. 1, No.

Applicant before: Institute of Process Engineering, Chinese Academy of Sciences

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 100190 HAIDIAN, BEIJING TO: 435001 HUANGSHI, HUBEI PROVINCE

C53 Correction of patent for invention or patent application
CB03 Change of inventor or designer information

Inventor after: Xu Hongbin

Inventor after: Liu Jingwen

Inventor after: Shi Yilang

Inventor after: Zhang Yi

Inventor after: Cai Zaihua

Inventor after: Li Zuohu

Inventor after: Cheng Xichuan

Inventor after: Zhang Xiaofei

Inventor after: Chen Xiaohong

Inventor after: Zhang Yang

Inventor before: Xu Hongbin

Inventor before: Zhang Yi

Inventor before: Li Zuohu

Inventor before: Zhang Xiaofei

Inventor before: Xiao Qinggui

Inventor before: Pei Lili

Inventor before: Li Ping

Inventor before: Zhang Yang

Inventor before: Zheng Shili

COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: XU HONGBIN ZHANG YI LI ZUOHU ZHANG XIAOFEI XIAO QINGGUI PEI LILI LI PING ZHANG YANG ZHENG SHILI TO: XU HONGBIN SHI YILANG ZHANG YI CAI ZAIHUA LI ZUOHU CHENG XICHUAN ZHANG XIAOFEI CHEN XIAOHONG ZHANG YANG LIU JINGWEN

COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 435001 HUANGSHI, HUBEI PROVINCE TO: 435000 HUANGSHI, HUBEI PROVINCE

ASS Succession or assignment of patent right

Owner name: HUBEI ZHENHUA CHEMICAL CO., LTD.

Free format text: FORMER OWNER: HUANGSHI ZHENHUA CHEMICAL INDUSTRY CO., LTD.

Effective date: 20120323

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20120323

Address after: 668 No. 435000 Huangshi city of Hubei province xisaishanqu Huangshi Avenue

Applicant after: Hubei ZhenHua Chemical Co., Ltd.

Address before: 435001 Huangshi city of Hubei province xisaishanqu Cisse Street Office of Liangshan Village

Applicant before: Huangshi Zhenhua Chemical Industry Co., Ltd.

C14 Grant of patent or utility model
GR01 Patent grant