CN106399688B - The removal methods of iron ion in a kind of trivalent chromium acid solution - Google Patents
The removal methods of iron ion in a kind of trivalent chromium acid solution Download PDFInfo
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Abstract
The invention discloses a kind of removal methods of iron ion in trivalent chromium acid solution.Described method includes following steps：Auxiliary agent is added in trivalent chromium acid solution, ferric ion is reduced into ferrous ion, then add in oxalate solution, solid-liquor separation is carried out to material after leaching, except the trivalent chromium acid solution after iron is used to produce chromic salts product；The ferrous oxalate obtained except iron is subjected to Oxidation Leaching in alkaline solution, iron in ferrous oxalate is converted into ferroso-ferric oxide, and oxalate is leached in solution, through solid-liquor separation, obtained oxalates leachate is used for circulation deferrization, is black iron oxide pigment after obtained ferroso-ferric oxide drying.Iron removing reagent consumption is greatly reduced in the present invention, and trivalent chromium acidity removing iron from solution is thorough, and by-product iron oxide black can reach the pigment performance of domestic 722 iron oxide black, and wherein can use the industries such as building, coating without high toxicity Cr VI.
Description
Technical field
The invention belongs to field of hydrometallurgy, and in particular, to the removing side of iron ion in a kind of trivalent chromium acid solution
Method, the method for iron ion efficient removal, iron removing reagent cycle and iron higher value application in more particularly to a kind of trivalent chromium acid solution.
Background technology
Trivalent chromium acid solution derives from a wealth of sources, such as high carbon ferro-chrome, chromite, vanadium metallurgy industry vanadium chromium slag containing Cr materials or
The acid hydrolysis solution that is generated after waste residue and sulfuric acid, hydrochloric acid or nitric acid reaction and the acid waste water etc. containing chromium, iron, due to one in raw material
As iron content, cause to contain iron ion in trivalent chromium acid solution.Trivalent chromium acid solution containing iron ion can be straight after removing iron
It connects to produce chromic salt product.Traditional soda chromium salt production method production chromic salt need to be produced sexavalence chromic salts as centre
Product, i.e., will first contain Cr materials and be oxidized to sexavalence chromic salts and separate, and then be then reduced into chromic salt.Due to sexavalence chromic salts toxicity
Greatly, environmental pollution weight, thus by trivalent chromium acid solution directly produce chromic salt not only have production procedure it is short, at low cost
Advantage can also avoid generating the carcinogenicity Cr VI to severe environmental pollution.
At present mainly there is method for removing iron in acid solution：It is hematite process, goethite process, ihleite method, ion-exchange, molten
Agent extraction etc..Has method mainly for Fe in solution3+Removing, with Cr in iron removal3+Entrainment loss, except iron
Equipment is complicated, and efficiency is low, and except the iron component after iron cannot efficiently use, therefore be not suitable for trivalent chromium acid solution and remove
Iron.Mohr's salt method is used to separate the Fe in trivalent chromium solutions2+, iron-removal rate to 96%, chromium loss late only has 1.85%, specific to grasp
Work is the addition excess sulfuric acid ammonium into high carbon ferro-chrome pickle liquor, it is made to be cooled to less than 5 DEG C from 70 DEG C quick (1h), ferrous ion
It is precipitated with iron ammonium sulfate crystal form, the filtrate after separation is chromium ammonium vanadium solution, and chromium ammonium vanadium can be as in electrolysis chromium processed
Mesosome.The major defect of Mohr's salt method is stringent to reaction condition requirement, and cost is too high, and commercial Application is not implemented at present.
Hu Guohua etc. (CN100528759) adds in theoretical amount 105%~120% to the solution of chromic acid containing iron ion
Oxalic acid adjusts pH=2.5 or so, obtains the ferrous oxalate of chromium sulfate solution and slightly solubility, and reaction carries out at normal temperatures, the time
Short, iron-removal rate to 98% is easy to operate, and chromium sulfate solution obtained by the reaction is used to produce chromic salt product.Except iron obtains
Ferrous oxalate outwards sell, for the raw material of cell positive material.
Oxalic acid removes iron principle：
H2C2O4·2H2O+Fe2+=FeC2O4·2H2O+2H+
Due to oxalic acid higher price (about 4000 yuan/ton), the addition of excessive oxalic acid is added except iron cost；Meanwhile grass
Sour ferrous iron must sell or handle in time to recycle oxalic acid except iron expense, and ferrous oxalate is used as battery material raw material, easy-to-use
It is influenced by Downstream Market.
Oxalates including oxalic acid is not high to reaction condition and equipment requirement except iron processes, and advantage is notable, should be chromium, iron
Separated desirable technique.To reduce oxalates except iron cost, and then chromic salt cleaning technology of preparing is established, and realize high carbon chromium
The commercial Application of iron acidolysis process, the present invention propose oxalates it is non-be excessively added high-efficient deferrization-oxalates recycle-it is iron standby
The higher value application route of black iron oxide pigment.
The content of the invention
For current trivalent chromium acidity removing iron from solution it is of high cost the problem of, the present invention proposes a kind of trivalent chromium acid solution
Ferroso-ferric oxide is made, it can be achieved that the recycling of oxalates in iron by deironing novel method, as iron black raw material.Technical thought
It is as follows：Oxalate solution is added in trivalent chromium acid solution and auxiliary agent remove iron, then the ferrous oxalate to obtain as raw material,
Obtained oxalates is recycled as iron removing reagent after inverted, and by-product ferroso-ferric oxide, and ferroso-ferric oxide can be used as having height
The iron oxide black pigment of added value and broad mass market prospect.
In order to achieve the above object, the present invention adopts the following technical scheme that：
The removal methods of iron ion in the trivalent chromium acid solution of the present invention are a kind of solution of chromic acid containing iron ion
The method of middle iron ion efficient removal, iron removing reagent Xun Huan and iron higher value application, specifically comprises the following steps：
(1) auxiliary agent is added in the solution of chromic acid containing iron ion and ferric ion is reduced to ferrous ion；
(2) obtain adding in oxalate solution in solution to step (1), and between the pH of solution is transferred to 2.5~3.0, into
Row is except iron；
(3) reaction solution for obtaining step (2) carries out separation of solid and liquid, and it is sub- with oxalic acid to respectively obtain trivalent chromium acid solution
Iron；
(4) alkaline solution is added in the ferrous oxalate for obtaining step (3), while adds in oxidant and carry out Leach reaction；
Wherein, the volume mass of the alkaline solution and ferrous oxalate ratio is 1:1~10:1L/kg, the mass concentration of the alkaline solution
For 5%~50%；The addition of the oxidant is fully converted to ferroso-ferric oxide theoretical amount for ferrous oxalate ferrous ions
1~50 times；
(5) slurry after step (4) is reacted carries out separation of solid and liquid, respectively obtains oxalate solution and is filtered with ferroso-ferric oxide
Cake；
(6) the ferroso-ferric oxide filter cake that step (5) obtains is washed, and filtered, obtain ferroso-ferric oxide and washing
Liquid；
(7) ferroso-ferric oxide that step (6) obtains is dried to get to black iron oxide pigment.
As optimal technical scheme, method of the present invention, the trivalent chromium acid solution described in step (1) is high-carbon
Ferrochrome, chromite, vanadium metallurgy industry vanadium chromium slag etc. are containing the acidolysis generated after Cr materials or waste residue and sulfuric acid, hydrochloric acid or nitric acid reaction
Liquid and the acid waste water etc. containing chromium, iron.Specifically, the high carbon ferro-chrome acid hydrolysis solution basic composition is：Cr3+：60~
100g/L, Fe2+：40~80g/L, Fe3+：<5g/L, it is other to be less than 5g/L；The chromite pickle liquor basic composition is：Cr3+：
30~50g/L, Fe2+：18~30g/L, Fe3+：<10g/L, Mg2+：8~10g/L, Al3+：10~15g/L；The vanadium chromium slag acidolysis
Liquid basis is：Cr3+：80~110g/L, Fe2+：1~5g/L, Fe3+：5~10g/L, V：1~5g/L；It is described to contain chromium, iron
Acid waste water basic composition is：Cr3+：1~10g/L, Fe2+：0.5~10g/L, Fe3+：0.5~10g/L.
As optimal technical scheme, method of the present invention, the auxiliary agent described in step (1) is hydrazine hydrate, vitamin
C, sodium pyrosulfite or citric acid, promoter addition be by ferric ion be reduced to ferrous ion theoretical amount 100%~
110%.
As optimal technical scheme, method of the present invention, oxalate solution dosage described in step (2) is to make acid molten
Iron is precipitated as the theoretical amount of ferrous oxalate in liquid.
As optimal technical scheme, method of the present invention, step (2) is middle to add in acid or alkali adjusting pH value, the tune
Section pH acid is one kind or above-mentioned several mixture in sulfuric acid, hydrochloric acid, nitric acid, and shown adjusting pH value is hydroxide with alkali
The mixture of one or more of sodium, potassium hydroxide, potassium carbonate, sodium carbonate, ammonium hydrogen carbonate, sodium acid carbonate.
As optimal technical scheme, method of the present invention, the alkaline solution described in step (4) is that sodium hydroxide is molten
Liquid, potassium hydroxide solution, sodium carbonate liquor, solution of potassium carbonate, ammonia spirit or ammonium bicarbonate soln.
Preferably, the mass concentration of the alkaline solution is 7%~40%, further preferably 10%~25%.
Preferably, the volume mass of the alkaline solution and ferrous oxalate ratio is 2:1~8:1L/kg, further preferably
2:1~6:1L/kg.
Preferably, the oxidant described in step (4) is a kind in air, oxygen, ozone, sodium peroxide or hydrogen peroxide
Or mixture of more than two kinds.
Preferably, the temperature leached described in step (4) is 20~110 DEG C, is preferably 40~100 DEG C, for example, 25 DEG C,
30 DEG C, 45 DEG C, 55 DEG C, 66 DEG C, 80 DEG C, 100 DEG C, 110 DEG C, 140 DEG C, 160 DEG C, 175 DEG C etc., further preferred temperature 50~90
℃；The time of the leaching is 1~8h, for example, 0.8h, 1.2h, 1.5h, 2.2h, 3.1h, 4.5h, 5.5h etc., further excellent
Select 3~5h.
Preferably, the separation of solid and liquid temperature of step (5) is 60~110 DEG C, is preferably 80 DEG C
As optimal technical scheme, the countercurrent washing series described in step (6) is 2~6 grades, is preferably 3 grades；
As optimal technical scheme, oxalate solution that step (2) adds in is ammonium oxalate, sodium oxalate or Potassium Oxalate Solution,
Therefore, the cleaning solution that the oxalate solution and (6) that step (5) obtains obtain is oxalate solution, the oxalate solution
For ammonium oxalate, sodium oxalate or potassium oxalate.
As optimal technical scheme, the cleaning solution Xun Huan that the oxalate solution that step (5) is obtained is obtained with step (6) is used
Iron is removed in step (2).
As optimal technical scheme, step (7) described drying temperature is 50~110 DEG C, is preferably 80 DEG C.
The present invention has following innovative point in terms of technological means：
(1) propose oxalates/oxalic acid is non-be excessively added when high-efficient deferrization technical method；
(2) recycling for iron removing reagent oxalates is realized；
(3) oxalate and the new method of iron ion dissociation are proposed, realizes the higher value application of ferro element.
The distinguishing feature of the present invention is that technological process is short, is discharged without " three wastes ", and the cyclic utilization rate of iron removing reagent oxalate reaches
To 90%, iron removing reagent consumption is greatly reduced, trivalent chromium acidity removing iron from solution is thorough, and by-product iron oxide black can reach domestic
The pigment performance of 722 iron oxide blacks, and wherein the industries such as building, coating can be used without high toxicity Cr VI.
Description of the drawings
Fig. 1 is the process flow chart of the removal methods of iron ion in trivalent chromium acid solution of the invention.
Specific embodiment
Any feature is obtained disclosed in this specification, it unless specifically stated, can be equivalent by other or with similar purpose
Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.It is described to understand the present invention just for the sake of help, it should not be considered as the concrete restriction to the present invention.
Embodiment 1
105% hydrazine hydrate solution of theoretical amount is added in high carbon ferro-chrome acid hydrolysis solution, is added in after reaction into reaction solution
Sodium oxalate solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, for filtrate for producing chromic salts, obtained oxalic acid is sub-
Iron its main chemical compositions w (FeC2O4·2H2O)=94.8%, other impurities are micro Mn, Ni, Co etc..
The ammonium hydroxide of ferrous oxalate sample and mass fraction 27% is placed in three-necked flask, reaction temperature is 60 DEG C, is maintained
Liquid-solid ratio (L/kg) is 2:1, it is passed through oxygen and starts timing, stop stirring after reacting 2h, maintain 60 DEG C of filtration temperature to reaction
Liquid is filtered, and 2 countercurrent washings are carried out to filter cake with clear water after filtering, and the filter cake after filtering dries in 100 DEG C of baking ovens
It is iron oxide black after dry, the ammonium oxalate solution that leachate and cleaning solution merge cycles to precipitate high carbon ferro-chrome acid hydrolysis solution
In ferrous iron, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches state
Produce the standard of 722 iron oxide blacks.
Embodiment 2
110% sodium pyrosulfite of theoretical amount is added in vanadium chromium slag sulfuric acid solution liquid, is added after reaction into reaction solution
Enter Potassium Oxalate Solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is for producing chromic salts, obtained oxalic acid
Ferrous iron its main chemical compositions w (FeC2O4·2H2O)=95.1%, other impurities are micro Mn, Ni, Co etc..
The sodium hydroxide solution of ferrous oxalate sample and mass fraction 10% is placed in three-necked flask, reaction temperature 60
DEG C, it is 3 to maintain liquid-solid ratio (L/kg):1, it is passed through air and starts timing, stop stirring after reacting 1.5h, maintain filtration temperature 70
DEG C to reacting liquid filtering, 3 countercurrent washings are carried out to filter cake with clear water after filtering, the filter cake after filtering is in 90 DEG C of baking ovens
It is iron oxide black after drying, the sodium oxalate solution that leachate and cleaning solution merge cycles to separate high carbon ferro-chrome acidolysis
Ferrous iron in liquid, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches
The standard of domestic 722 iron oxide black.
Embodiment 3
110% vitamin C of theoretical amount is added in chromite acid hydrolysis solution, adds in ammonium oxalate into reaction solution after reaction
Solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is for producing chromic salts, its master of obtained ferrous oxalate
Want chemical composition w (FeC2O4·2H2O)=96.1%, other impurities are micro Mn, Ni, Co etc..
The potassium hydroxide solution of ferrous oxalate sample and mass fraction 40% is placed in three-necked flask, reaction temperature 80
DEG C, it is 4 to maintain liquid-solid ratio (L/kg):1, it adds in sodium peroxide solution and starts timing, stop stirring after reacting 2.2h, maintained
80 DEG C of temperature is filtered to reacting liquid filtering, 4 countercurrent washings are carried out to filter cake with clear water after filtering, the filter cake after filtering is 80
It is iron oxide black after being dried in DEG C baking oven, the Potassium Oxalate Solution that leachate and cleaning solution merge cycles to separate high-carbon
Ferrous iron in ferrochrome acid hydrolysis solution, for the leaching rate of oxalate close to 100%, by-product iron oxide is black for pigment industry, iron black
Performance reaches the standard of domestic 722 iron oxide black.
Embodiment 4
The citric acid of theoretical amount 110% is added in containing chromium, iron acid waste water, adds in grass into reaction solution after reaction
Acid ammonium solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is for producing chromic salts, obtained ferrous oxalate
Its main chemical compositions w (FeC2O4·2H2O)=94.1%, other impurities are micro Mn, Ni, Co etc..
The sodium carbonate liquor of ferrous oxalate sample and mass fraction 10% is placed in three-necked flask, reaction temperature 90
DEG C, it is 5 to maintain liquid-solid ratio (L/kg):1, it is passed through ozone and starts timing, stop stirring after reacting 3.1h, maintain filtration temperature 90
DEG C to reacting liquid filtering, 6 countercurrent washings are carried out to filter cake with clear water after filtering, the filter cake after filtering is in 70 DEG C of baking ovens
It is iron oxide black after drying, the sodium oxalate solution that leachate and cleaning solution merge cycles to separate high carbon ferro-chrome acidolysis
Ferrous iron in liquid, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches
The standard of domestic 722 iron oxide black.
Embodiment 5
The citric acid of theoretical amount 110% is added in the liquid of hydrochloric acidolysis containing high carbon ferro-chrome, after reaction into reaction solution
Add in oxalic acid solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is for producing chromic salts, obtained oxalic acid
Ferrous iron its main chemical compositions w (FeC2O4·2H2O)=94.1%, other impurities are micro Mn, Ni, Co etc..
The solution of potassium carbonate of ferrous oxalate sample and mass fraction 10% is placed in three-necked flask, reaction temperature 100
DEG C, it is 6 to maintain liquid-solid ratio (L/kg):1, it adds in hydrogen peroxide and starts timing, stop stirring after reacting 4.5h, maintain filtration temperature
90 DEG C, to reacting liquid filtering, carry out filter cake 2 countercurrent washings, the filter cake after filtering is in 60 DEG C of baking ovens after filtering with clear water
It is iron oxide black after middle drying, the Potassium Oxalate Solution that leachate and cleaning solution merge cycles to separate high carbon chromium ferrous acid
The ferrous iron in liquid is solved, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches
To the standard of domestic 722 iron oxide black.
Embodiment 6
The hydrazine hydrate solution of theoretical amount 104% is added in the liquid of hydrochloric acidolysis containing high carbon ferro-chrome, after reaction to reaction
Oxalic acid solution is added in liquid, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is obtained for producing chromic salts
Ferrous oxalate its main chemical compositions w (FeC2O4·2H2O)=94.1%, other impurities are micro Mn, Ni, Co etc..
The ammonium bicarbonate soln of ferrous oxalate sample and mass fraction 20% is placed in three-necked flask, reaction temperature 50
DEG C, it is 7 to maintain liquid-solid ratio (L/kg):1, it adds in hydrogen peroxide and starts timing, stop stirring after reacting 5.5h, maintain filtration temperature
80 DEG C, to reacting liquid filtering, carry out filter cake 6 countercurrent washings, the filter cake after filtering is in 50 DEG C of baking ovens after filtering with clear water
It is iron oxide black after middle drying, the ammonium oxalate solution that leachate and cleaning solution merge cycles to separate high carbon chromium ferrous acid
The ferrous iron in liquid is solved, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches
To the standard of domestic 722 iron oxide black.
Embodiment 7
100% hydrazine hydrate solution of theoretical amount is added in high carbon ferro-chrome acid hydrolysis solution, is added in after reaction into reaction solution
Sodium oxalate solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, for filtrate for producing chromic salts, obtained oxalic acid is sub-
Iron its main chemical compositions w (FeC2O4·2H2O)=94.8%, other impurities are micro Mn, Ni, Co etc..
The ammonium hydroxide of ferrous oxalate sample and mass fraction 5% is placed in three-necked flask, reaction temperature is 20 DEG C, maintaining liquid
Gu it is 10 than (L/kg):1, it is passed through oxygen and starts timing, stop stirring after reacting 8h, maintain 60 DEG C of filtration temperature to reaction solution
It is filtered, 2 countercurrent washings is carried out to filter cake with clear water after filtering, after the filter cake after filtering is dried in 50 DEG C of baking ovens
The ammonium oxalate solution that as iron oxide black, leachate and cleaning solution merge cycles to precipitate in high carbon ferro-chrome acid hydrolysis solution
Ferrous iron, the leaching rate of oxalate is close to 100%, and by-product iron oxide is black for pigment industry, and iron black performance reaches domestic 722
The standard of iron oxide black.
Embodiment 8
110% sodium pyrosulfite of theoretical amount is added in vanadium chromium slag sulfuric acid solution liquid, is added after reaction into reaction solution
Enter Potassium Oxalate Solution, by solution be transferred to 2.5~3.0 between, filtering reacting liquid, filtrate is for producing chromic salts, obtained oxalic acid
Ferrous iron its main chemical compositions w (FeC2O4·2H2O)=95.1%, other impurities are micro Mn, Ni, Co etc..
The sodium hydroxide solution of ferrous oxalate sample and mass fraction 50% is placed in three-necked flask, reaction temperature is
180 DEG C, it is 1 to maintain liquid-solid ratio (L/kg):1, it is passed through air and starts timing, stop stirring after reacting 1h, maintain filtration temperature
110 DEG C, to reacting liquid filtering, carry out filter cake 6 countercurrent washings, the filter cake after filtering is in 110 DEG C of bakings after filtering with clear water
It is iron oxide black after being dried in case, the sodium oxalate solution that leachate and cleaning solution merge cycles to separate high carbon ferro-chrome
Ferrous iron in acid hydrolysis solution, for the leaching rate of oxalate close to 100%, by-product iron oxide is black for pigment industry, iron black performance
Reach the standard of domestic 722 iron oxide black.
Certainly, the present invention without deviating from the spirit and substance of the present invention, can also be familiar with there are many embodiment
Those skilled in the art can disclosure according to the present invention make various corresponding changes and deformation, but these it is corresponding change and
Deformation should all belong to the scope of the claims of the present invention.
Claims (10)
1. the removal methods of iron ion, include the following steps in a kind of trivalent chromium acid solution：
（1）Auxiliary agent is added in trivalent chromium acid solution, ferric ion is reduced to ferrous ion；
（2）To step（1）Obtain adding in oxalic acid solution or oxalate solution in solution, and by the pH of solution be transferred to 2.5~3.0 it
Between, it carries out except iron；
（3）By step（2）Reaction solution after reaction carries out separation of solid and liquid, respectively obtains trivalent chromium acid solution and ferrous oxalate；
（4）By step（3）Alkaline solution is added in obtained ferrous oxalate, while adds in oxidant and carries out Leach reaction；Its
In, the volume mass ratio of the alkaline solution and ferrous oxalate is 1:1~10:1 L/kg, the mass concentration of the alkaline solution
For 5%~50%；The addition of the oxidant is fully converted to the 1 of ferroso-ferric oxide theoretical amount for ferrous oxalate ferrous ions
~50 times；
（5）By step（4）Slurry after reaction carries out separation of solid and liquid, respectively obtains oxalate solution and ferroso-ferric oxide filter cake；
（6）By step（5）Obtained ferroso-ferric oxide filter cake is washed, and is filtered, and obtains ferroso-ferric oxide and cleaning solution；
（7）By step（6）Obtained ferroso-ferric oxide is dried to get to black iron oxide pigment.
2. according to the method described in claim 1, it is characterized in that, step（1）Described in trivalent chromium acid solution be high-carbon
The acid hydrolysis solution that is generated after ferrochrome, chromite or vanadium metallurgy industry vanadium chromium slag and sulfuric acid, hydrochloric acid or nitric acid reaction and containing chromium, iron
Acid waste water.
3. according to the method described in claim 1, it is characterized in that, step（1）Described in promoter addition be make ferric iron from
Son is reduced to the 100%~110% of ferrous ion theoretical amount.
4. method according to claim 1 or 2, which is characterized in that step（1）Described in auxiliary agent for hydrazine hydrate, dimension life
One kind in plain C, sodium pyrosulfite or citric acid.
5. according to the method described in claim 1, it is characterized in that, step（2）Described in oxalic acid solution or oxalate solution use
Amount is the theoretical amount that iron in acid solution is made to be precipitated as ferrous oxalate.
6. according to the method described in claim 1, it is characterized in that, step（4）Described in alkaline solution for sodium hydroxide it is molten
One kind in liquid, potassium hydroxide solution, sodium carbonate liquor, solution of potassium carbonate, ammonia spirit or ammonium bicarbonate soln.
7. according to the method described in claim 1, it is characterized in that, step（4）Described in oxidant be air, it is oxygen, smelly
One kind or two or more mixture in oxygen, sodium peroxide or hydrogen peroxide.
8. according to the method described in claim 1, it is characterized in that, step（4）Described in the temperature that leaches be 20~180 DEG C,
The time of the leaching is 1~8 h.
9. according to the method described in claim 1, it is characterized in that, step（5）Separation of solid and liquid temperature be 60~110 DEG C.
10. according to the method described in claim 1, it is characterized in that, by step（5）Obtained oxalate solution and step（6）
Obtained cleaning solution Xun Huan is for step（2）Except iron.
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| CN111910076B (en) * | 2019-05-09 | 2022-04-05 | 湖北振华化学股份有限公司 | Method for removing iron impurities from trivalent chromium compound |
| CN110357777B (en) * | 2019-06-27 | 2022-02-01 | 黄冈师范学院 | Synthetic method of high-purity ferrous oxalate |
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| CN115976535B (en) * | 2022-12-23 | 2023-08-18 | 中国科学院青海盐湖研究所 | Method and device for preparing trivalent chromium salt by electrochemical oxidation of ferrochrome in acidic system |
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