CN104726705A - Method for extracting chromium from chromite by leaching - Google Patents
Method for extracting chromium from chromite by leaching Download PDFInfo
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- CN104726705A CN104726705A CN201310719091.XA CN201310719091A CN104726705A CN 104726705 A CN104726705 A CN 104726705A CN 201310719091 A CN201310719091 A CN 201310719091A CN 104726705 A CN104726705 A CN 104726705A
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Abstract
The invention relates to a method for extracting chromium from chromite by pressure leaching, which comprises the following steps: mixing chromite and/or pretreated chromite with a potassium hydroxide water solution, a potassium carbonate water solution and a potassium metaaluminate water solution to obtain an original slurry; adding the original slurry into a high-pressure autoclave, introducing oxidizing gas, and carrying out pressure leaching oxidizing reaction to obtain a reaction slurry; and carrying out solid-liquid separation to respectively obtain iron-rich tailings and a solution containing potassium chromate, potassium hydroxide, potassium carbonate, potassium aluminate and other water-soluble impurity components. The method has the advantages of greatly lower reaction temperature and low energy consumption, and effectively lowers the production cost, and the maximum chromium extraction yield can reach 97% above. Besides, the volume of the high-pressure autoclave can be 200L, and the reaction medium has the same proportioning as the industrial circulating liquor, so that the process is very close to the industrial process and can easily implement industrialization.
Description
Technical field
The invention belongs to chromite hydrometallurgy and chromium chemical field, particularly relate to chromite pressure leaching in a kind of potassium hydroxide, salt of wormwood, potassium aluminate mixing solutions and put forward the method for chromium.
Background technology
Chromite is a kind of mineral of spinel configuration, is at present uniquely can for the chrome ore of exploitation.Chromite main component is the oxide compound of iron, magnesium and chromium, and general formula can be expressed as (Fe, Mg) Cr
2o
4.Chromic salts is one of important inorganic chemical product, and be the basic material of important chemical industry-light industry-senior alloy material, the Industrial products in China's national economy about 10% are relevant with chromic salts.
At present, be that the method for raw material production chromic salts product mainly contains calcium roasting method and calcium-free roasting method with chromite.The existing production technology of China's chromaking work falls behind, and what current most enterprises employing was traditional has calcium sodium roasting technique, this technique chromium low conversion rate, and temperature of reaction is high, chromium slag is many, seriously polluted, and sexavalent chrome is composed with strong carinogenicity yellow ultramarine form and deposited.Severe contamination water body, soil and air, threaten personnel safety and health, become the focus of social extensive concern, causes the great attention of country.Chromium slag contaminated is unassailable the difficult problem of environmental protection of a specified duration, and the calcium-free roasting technology chromium leaching yield of optimization traditional technology is high, deslagging is few but facility investment large, and roasting process body of heater ring formation is serious, the universal difficulty of industrializing implementation.
CN1418823A, CN102275992A, CN85102681, CN1579947, CN101066779, CN102643977A, CN85100396 etc. are respectively to having calcium roasting or being optimized improvement without calcification baking technique, improve chromium transformation efficiency to a certain extent and reduce the discharge of chromium slag simultaneously, but the roasting principle of above technique, operating process and service temperature are substantially identical with traditional technology, temperature of reaction is still very high, energy consumption is large, and only partly can reduce but not inherently solve chromium slag contaminated problem.
In recent years, the liquid phase method process for cleanly preparing of Chinese Academy Of Sciences Process Engineering Research Institute to chromic salts has done large quantity research, develops sub-molten salt method and molten-salt growth method series chromium-salt clean production process.US7968066B2 utilizes KOH fused salt liquid phase oxygenolysis chromite, and transformation efficiency is high, and bed drain purge is little, and temperature of reaction is at 250 ~ 400 DEG C, and this technique builds ton demonstration project at present.But its alkali lye circulating and evaporating concentration process energy consumption is larger.
Produce potassiumchromate under also having CN101659444 and CN101481144 to propose the effect adding catalyzer in system, chromite is at NaOH-NaNO
3-H
2o or KOH-KNO
3-H
2react with oxidizing gas in O medium, nitrate radical, as catalytic media, is not consumed in the reaction; The reaction product mixture of alkali lye, Sodium chromate (potassium) and scum is obtained after reaction.Through the leaching of reaction product mixture, solid-liquor separation, transpiration cooling crystallization obtains Sodium chromate (potassium), after drip washing and drying, finally obtains qualified Sodium chromate (potassium) product; Crystalline mother solution circulates together with alkali lye.The method chromium transformation efficiency is greater than 99%, is less than 0.5% in slag containing chromium rate.But introduce NaNO in this normal direction system
3, make later separation complicated.
CN101817561A discloses a kind of method of pollution-free production of sodium chromate by pressure leaching of chromite.The method is that chromite carries out heated oxide reaction with oxidizing gas in NaOH solution; Liquid after having reacted adds calcium oxide removal of impurities after dilution solid-liquid separation in liquid, the mixture solution that removes obtained obtains crystals of sodium chromate and crystalline mother solution through evaporative crystallization, after solid-liquid separation, the saturated chromium acid sodium solution drip washing of crystals of sodium chromate, can obtain qualified Sodium chromate product after drying.This method reaction system composition is simple, does not introduce difficult separation phase, be conducive to the high efficiency separation of Sodium chromate in system.But this method pressure is high, and facility investment is large.
Summary of the invention
The object of the present invention is to provide a kind of according to sub-molten salt character and chromite mineralogical character, the method that pressure leaching carries chromium is carried out to chromite, the cost of described method is low, extraction yield is high and mild condition.
Principle of the present invention is that chromite is in 200L autoclave, react at 200 DEG C ~ 300 DEG C with oxidizing gas with certain density potassium hydroxide, salt of wormwood, potassium metaaluminate mixing solutions, make trivalent chromium be oxidized to sexavalent chrome generation potassiumchromate and enter solution, the reaction wherein related to has:
FeO·Cr
2O
3+4KOH+7/2O
2→1/2Fe
2O
3+2K
2CrO
4+2H
2O
MgO·Cr
2O
3+4KOH+3/2O
2→MgO+2K
2CrO
4+2H
2O
Cr
2O
3+4KOH+3/2O
2→2K
2CrO
4+2H
2O
For reaching above-mentioned purpose, the present invention adopts following technical scheme:
Chromite pressure leaching puies forward a method for chromium, comprises the steps:
(1) chromite and/or pretreated chromite and potassium hydroxide aqueous solution, wet chemical, potassium metaaluminate aqueous solution are obtained original slurry;
(2) the original slurry that step (1) is obtained is added in autoclave, pass into oxidizing gas, carry out pressure leaching oxidizing reaction, obtain reacting disposed slurry;
(3) reaction disposed slurry step (2) obtained, through solid-liquid separation, obtains rich iron tailings and the solution containing potassiumchromate, potassium hydroxide, salt of wormwood, potassium aluminate and other water-soluble impurity components respectively.
Wherein, it is identical that Posterior circle liquid proportioning is reacted by the present invention's potassium hydroxide used, salt of wormwood, potassium aluminate mixing solutions and factory, therefore can directly use circulation fluid and without the need to removal of impurities, make the present invention be easy to realize industrialization; In addition, add salt of wormwood and potassium aluminate can improve reaction solution boiling point, greatly can reduce operation pressure, reduce facility investment.
In method of the present invention, pre-treatment described in step (1) is mechanical activation and/or calcination activation.
In method of the present invention, described mechanical activation is the one kind or two or more combination of roller ball mill, planetary ball mill or stirring ball-milling.
In method of the present invention, in step (1), potassium hydroxide aqueous solution concentration is 40%wt ~ 70wt%, be such as 42wt%, 46wt%, 55wt%, 62wt%, 68wt% etc., wet chemical concentration is 1%wt ~ 15%wt, be such as 2wt%, 5wt%, 9wt%, 13wt% etc., potassium metaaluminate concentration of aqueous solution is 1%wt ~ 10%wt, such as, be 2wt%, 5wt%, 7wt%, 9wt% etc.
In method of the present invention, in step (1), the mass ratio of potassium hydroxide and chromite is 2.5:1 ~ 8:1, such as, be 2.7:1,3.8:1,5.5:1,6.5:1,7:1 etc., preferred 3:1 ~ 5:1, more preferably 3.3:1 ~ 4:1.
In method of the present invention, step (2) described oxidizing gas is the one kind or two or more mixing in air, oxygen, oxygen-rich air or ozone gas; Be preferably oxygen and/or air.
In method of the present invention, the oxidizing reaction temperature described in step (2) is 200 ~ 300 DEG C, such as, be 205 DEG C, 215 DEG C, 222 DEG C, 250 DEG C, 260 DEG C, 280 DEG C, 295 DEG C etc., is preferably 230 ~ 260 DEG C; Reaction times is 2 ~ 8h, preferably 4 ~ 6h, such as, be 4.1h, 4.8h, 5.2h, 5.7h, 5.9h etc.
In method of the present invention, passing into steam stagnation pressure in oxidizing gas rear oxidation gas and still in step (2) is 0.1MPa ~ 2MPa, such as, be 0.3MPa, 0.8MPa, 1.2MPa, 1.6MPa, 1.9MPa etc., is preferably 0.5MPa ~ 1MPa.
In method of the present invention, the solid-liquid separation described in step (3), first dilutes with clear water, and then carries out solid-liquid separation; The concentration of potassium hydroxide be preferably diluted in slurry is 100-500g/L, such as, be 110g/L, 140g/L, 180g/L, 250g/L, 310g/L, 390g/L, 420g/L, 460g/L, 480g/L etc., more preferably 300g/L.
Preferably, temperature during described solid-liquid separation is 60 ~ 130 DEG C, such as, be 65 DEG C, 88 DEG C, 102 DEG C, 110 DEG C, 116 DEG C, 124 DEG C etc., adopts filtering separation or centrifugation.
As optimal technical scheme, method of the present invention, comprises the following steps:
(1) the mixed solution mixed preparing of chromite and potassium hydroxide, salt of wormwood, potassium aluminate is obtained raw material slurry, and be preheated to 200 ~ 300 DEG C;
Wherein potassium hydroxide and chromite mass ratio are 2.5:1 ~ 8:1, and potassium hydroxide aqueous solution concentration is 40%wt ~ 70%wt, and wet chemical concentration is 1%wt ~ 15%wt, and potassium metaaluminate concentration of aqueous solution is 1%wt ~ 10%wt;
(2) treat that raw slurry that step (1) obtains is to preset temperature, passes into oxidizing gas, and applies mechanical stirring, carry out oxidation 2 ~ 8h, obtain reaction paste after completion of the reaction at remaining on 200 ~ 300 DEG C;
(3) with clear water, step (2) gained reaction paste is diluted, the concentration of potassium hydroxide be diluted in slurry is 100-500g/L, and the Solid-liquid mixture obtained containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components is starched; Then at 60 ~ 130 DEG C, obtained solid-liquid mixed slurry is carried out filtering separation or centrifugation, obtain rich iron tailings and chromium alkaline solution respectively.
Compared with prior art, the present invention has obvious advantage:
In the tailings that the method obtains, chrome content is low, and in chromite, the transformation efficiency of chromium can reach more than 97%, and tailings quantity discharged is little, and in tailings, content of 6-valence Cr ions is low, and environmental pollution is little, is easy to realize tailings comprehensive utilization.
From reaction conditions, compared with traditional technology, temperature of reaction reduces greatly, and energy consumption is low, effectively can reduce the production cost of potassiumchromate.
Compared with CN101817561A, add salt of wormwood with after potassium aluminate under identical alkali concn solution boiling point increase substantially, can greatly reduce operation pressure, reduce facility investment.
From reaction scale, autoclave useful volume is 200L, and reaction medium is identical with industrial reaction Posterior circle liquid proportioning, so this process and commercial run are closely, is easy to realize industrialization.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment only understands the present invention for helping, and should not be considered as concrete restriction of the present invention.
Embodiment 1
By granularity be below 200 orders 13Kg chromite with containing 45%wt KOH, 10%wt K
2cO
3, 8%wt KAlO
2140L mixing solutions add in 200L autoclave, alkali ore deposit, than for 8:1, is heated to 250 DEG C, then in solution, pass into oxygen, and stir, chromite is fully mixed with oxygen, hierarchy of control total pressure is 1.5MPa, reacts 6 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 300g/L in reaction paste, by mixed slurry filtering separation under about 80 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 97%.Embodiment 2
By granularity be below 200 orders 22Kg chromite with containing 50%wt KOH, 10%wt K
2cO
3, 10%wt KAlO
2140L mixing solutions add in 200L autoclave, alkali ore deposit, than for 5:1, is heated to 280 DEG C, then in solution, pass into oxygen, and stir, chromite is fully mixed with oxygen, hierarchy of control total pressure is 1MPa, reacts 4 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 300g/L in reaction paste, by mixed slurry filtering separation under about 80 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 88%.Embodiment 3
By granularity be below 200 orders 36Kg chromite with containing 55%wt KOH, 15%wt K
2cO
3, 5%wt KAlO
2140L mixing solutions add in 200L autoclave, alkali ore deposit, than for 3:1, is heated to 260 DEG C, then in solution, pass into oxygen, and stir, chromite is fully mixed with oxygen, hierarchy of control total pressure is 0.2MPa, reacts 7 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 300g/L in reaction paste, by mixed slurry filtering separation under about 80 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 97%.Embodiment 4
By granularity be below 200 orders 33Kg chromite with containing 60%wt KOH, 10%wt K
2cO
3, 6%wt KAlO
2145L mixing solutions add in 200L autoclave, alkali ore deposit, than for 3.3:1, is heated to 210 DEG C, then in solution, pass into oxygen, and stir, chromite is fully mixed with oxygen, hierarchy of control total pressure is 2MPa, reacts 6 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 120g/L in reaction paste, by mixed slurry filtering separation under about 100 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 96%.
Embodiment 5
By granularity be below 200 orders 22Kg chromite with containing 65%wt KOH, 5%wt K
2cO
3, 8%wt KAlO
2140L mixing solutions add in 200L autoclave, alkali ore deposit, than for 5:1, is heated to 290 DEG C, then in solution, pass into pressurized air, and stir, chromite is fully mixed with gas, hierarchy of control total pressure is 2MPa, reacts 5 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 500g/L in reaction paste, by mixed slurry filtering separation under about 130 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 98%.
Embodiment 6
By granularity be below 200 orders 36Kg chromite with containing 52%wt KOH, 15%wt K
2cO
3, 8%wt KAlO
2140L mixing solutions add in 200L autoclave, alkali ore deposit, than for 3:1, is heated to 240 DEG C, then in solution, pass into pressurized air, and stir, chromite is fully mixed with gas, hierarchy of control total pressure is 0.8MPa, reacts 8 hours, chromite and oxygen are fully reacted.Finally obtain starching containing the Solid-liquid mixture containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components, cooling sampling dilution, be diluted to concentration of potassium hydroxide 400g/L in reaction paste, by mixed slurry filtering separation under about 60 DEG C, obtain rich iron tailings respectively and contain chromium alkali lye, record chromium content by after tailings repetitive scrubbing, drying through titration, calculate the transformation efficiency of chromium in chromite more than 99%.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. chromite pressure leaching puies forward a method for chromium, comprises the steps:
(1) chromite and/or pretreated chromite and potassium hydroxide aqueous solution, wet chemical, potassium metaaluminate aqueous solution are obtained original slurry;
(2) the original slurry that step (1) is obtained is added in autoclave, pass into oxidizing gas, carry out pressure leaching oxidizing reaction, obtain reacting disposed slurry;
(3) reaction disposed slurry step (2) obtained, through solid-liquid separation, obtains rich iron tailings and the solution containing potassiumchromate, potassium hydroxide, salt of wormwood, potassium aluminate and other water-soluble impurity components respectively.
2. method according to claim 1, is characterized in that, pre-treatment described in step (1) is mechanical activation and/or calcination activation.
3. method according to claim 2, is characterized in that, described mechanical activation is the one kind or two or more combination of roller ball mill, planetary ball mill or stirring ball-milling.
4. method according to claim 1, is characterized in that, in step (1), potassium hydroxide aqueous solution concentration is 40%wt ~ 70wt%, and wet chemical concentration is 1%wt ~ 15%wt, and potassium metaaluminate concentration of aqueous solution is 1%wt ~ 10%wt.
5. method according to claim 1, is characterized in that, in step (1), the mass ratio of potassium hydroxide and chromite is 2.5:1 ~ 8:1, preferred 3:1 ~ 5:1, more preferably 3.3:1 ~ 4:1.
6. method according to claim 1, is characterized in that, step (2) described oxidizing gas is the one kind or two or more mixing in air, oxygen, oxygen-rich air or ozone gas; Be preferably oxygen and/or air.
7. according to the method for claim 1, it is characterized in that, the oxidizing reaction temperature described in step (2) is 200 ~ 300 DEG C, is preferably 230 ~ 260 DEG C; Reaction times is 2 ~ 8h, preferably 4 ~ 6h.
8. method according to claim 1, is characterized in that, passing into steam stagnation pressure in oxidizing gas rear oxidation gas and still in step (2) is 0.1MPa ~ 2MPa, is preferably 0.5MPa ~ 1MPa.
9. method according to claim 1, is characterized in that, the solid-liquid separation described in step (3), first dilutes with clear water, and then carries out solid-liquid separation; The concentration of potassium hydroxide be preferably diluted in slurry is 100-500g/L, more preferably 300g/L;
Preferably, temperature during described solid-liquid separation is 60 ~ 130 DEG C, more preferably 80 DEG C, adopts filtering separation or centrifugation.
10. method according to claim 1, is characterized in that, comprises the following steps:
(1) the mixed solution mixed preparing of chromite and potassium hydroxide, salt of wormwood, potassium aluminate is obtained raw material slurry, and be preheated to 200 ~ 300 DEG C;
Wherein potassium hydroxide and chromite mass ratio are 2.5:1 ~ 8:1, and potassium hydroxide aqueous solution concentration is 40%wt ~ 70%wt, and wet chemical concentration is 1%wt ~ 15%wt, and potassium metaaluminate concentration of aqueous solution is 1%wt ~ 10%wt;
(2) treat that raw slurry that step (1) obtains is to preset temperature, passes into oxidizing gas, and applies mechanical stirring, carry out oxidation 2 ~ 8h, obtain reaction paste after completion of the reaction at remaining on 200 ~ 300 DEG C;
(3) with clear water, step (2) gained reaction paste is diluted, the concentration of potassium hydroxide be diluted in slurry is 100-500g/L, preferred 300g/L, the Solid-liquid mixture obtained containing rich iron tailings, potassiumchromate, potassium hydroxide, salt of wormwood, potassium metaaluminate and other water-soluble impurity components is starched; Then, at 60 ~ 130 DEG C, preferably 80 DEG C, obtained solid-liquid mixed slurry is carried out filtering separation or centrifugation, obtain rich iron tailings and chromium alkaline solution respectively.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105420487A (en) * | 2015-11-23 | 2016-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Potassic roasting method for chrome ore |
| CN109399718A (en) * | 2017-08-18 | 2019-03-01 | 中国科学院过程工程研究所 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399717A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399716A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399715A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399719A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109402416A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
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| CN101508466A (en) * | 2008-10-24 | 2009-08-19 | 天津派森科技有限责任公司 | High-efficiency, energy-conservation and clean method for producing chromate |
| CN101817561A (en) * | 2010-04-12 | 2010-09-01 | 中国科学院过程工程研究所 | Method for pollution-free production of sodium chromate by pressure leaching of chromite |
| CN103449522A (en) * | 2012-06-01 | 2013-12-18 | 中国科学院过程工程研究所 | Method for producing chromates through using chromium-containing waste residues |
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| CN101508466A (en) * | 2008-10-24 | 2009-08-19 | 天津派森科技有限责任公司 | High-efficiency, energy-conservation and clean method for producing chromate |
| CN101817561A (en) * | 2010-04-12 | 2010-09-01 | 中国科学院过程工程研究所 | Method for pollution-free production of sodium chromate by pressure leaching of chromite |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105420487A (en) * | 2015-11-23 | 2016-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Potassic roasting method for chrome ore |
| CN109399718A (en) * | 2017-08-18 | 2019-03-01 | 中国科学院过程工程研究所 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399717A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399716A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399715A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399719A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109402416A (en) * | 2017-08-18 | 2019-03-01 | 湖北振华化学股份有限公司 | A method of the liquid phase oxidation of material containing chromium mentions chromium |
| CN109399718B (en) * | 2017-08-18 | 2021-06-22 | 中国科学院过程工程研究所 | Method for extracting chromium from chromium-containing material by liquid-phase oxidation |
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| CN104726705B (en) | 2017-06-06 |
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