CN106186067B - A kind of method using chromite as raw material clean manufacturing chrome green - Google Patents
A kind of method using chromite as raw material clean manufacturing chrome green Download PDFInfo
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- CN106186067B CN106186067B CN201610526889.6A CN201610526889A CN106186067B CN 106186067 B CN106186067 B CN 106186067B CN 201610526889 A CN201610526889 A CN 201610526889A CN 106186067 B CN106186067 B CN 106186067B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/02—Oxides or hydrates thereof
- C01G37/033—Chromium trioxide; Chromic acid
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention discloses a kind of method using chromite as raw material clean manufacturing chrome green.Described method uses chromite as raw material, it is oxidant through sulfuric acid dissolution using chromic anhybride, the element mixed solutions such as chromium sulfate, ferric sulfate are obtained after dissolution, utilize ammonium salt iron removal technology, realize that ferrochrome separates in solution, chromium hydroxide, aluminium hydroxide are precipitated by the acidity for adjusting the mixed solution after separating, precipitate the ammonium sulfate after chromium, aluminium, the mixed solution of magnesium sulfate prepares nitrogen magnesium fertilizer by evaporative crystallization.Solid-liquor separation after obtained chromium hydroxide, aluminium hydroxide alkali soluble is obtained into chromium hydroxide solid, obtains chromium oxide product after scrubbed, calcining, isolated solution prepares aluminum hydroxide product by Bayer process.Preparation technology of the present invention is simple, and byproduct is aluminium hydroxide and ammonium sulfate, sulfuric acid magnesium compound, does not produce waste and pollution, synthesis cost is low, and energy consumption is low, has huge popularization and application potentiality in green production chrome green field.
Description
Technical field
The present invention relates to the preparation field of crome metal and its chromic salts, and in particular to one kind is using chromite as raw material clean manufacturing
The method of chrome green.
Background technology
Chrome green (also known as chrome oxide green Cr2O3) it is widely used in metallurgical and chemical industry.Because it has good stabilization
Property is also used for paint, glass, enamel, cement coloring agent, simultaneously can be used for organic catalyst.
Chrome green preparation method includes：Reducing process (with sodium dichromate or potassium bichromate and ammonium sulfate or ammonium chloride,
The mixing such as sulphur carry out reduction firing), the side such as thermal decomposition method (being prepared with chromic anhybride or ammonium dichromate, chromium hydroxide thermal decomposition)
Method.The preparation of external chrome green mainly uses sodium dichromate thermal reduction, and sodium dichromate is mixed and reflection with ammonium sulfate
Chrome green is made through high-temperature calcination after hot wash removes sodium salt in reaction in furnace, furnace charge.The country mainly uses chromic anhybride
Thermal decomposition method, chromium trioxide is set to be changed into chrome green through high-temperature calcination analysis oxygen chromic anhybride.Above-mentioned route is by chromium mostly
First sexavalence chromic salts is made through alkaline process in iron ore, then chrome green is made by sexavalence chromic salts, and Cr VI can not be avoided in production process
Pollution problem, and it is all sodium chromate deep processed product that production process is raw materials used, and there is also prepare cost is higher, energy consumption is high etc.
Problem.
The content of the invention
The present invention using chromite as raw material, there is provided a kind of low energy consumption, it is pollution-free, disclosure satisfy that it is industrial three oxidation two
Chromium clean environment firendly production method, to solve existing the defects of existing using sexavalence chromic salts as raw material production chrome green technology.
To achieve the above object, the invention provides a kind of side using chromite as raw material clean manufacturing chrome green
Method.Specifically, this method comprises the following steps：
First, according in chromite metallic element chromium cubage reaction needed for the concentrated sulfuric acid amount, the required concentrated sulfuric acid is dilute
Release；
2nd, dilute sulfuric acid, chromite, the chromic anhybride prepared step 1 are sequentially added in pressure-resistant kettle, in 120~150 DEG C of temperature
Degree 1~3h of lower reaction, separation of solid and liquid, gained liquid phase is chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the oxidants of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium from
The alkaline matter of son adjusts mixed solution pH value to 2.5~3；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature and is kept 0.5 for 110~160 DEG C
~5h, separation of solid and liquid, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, the alkaline matter containing ammonium ion after the mixed solution purified treatment after iron removaling in step 4, will be added to adjust
After the pH value of solution is 7.0, solid-liquor separation, gained solid phase is the mixture of chromium hydroxide and aluminium hydroxide, and gained liquid phase is sulphur
The mixed solution of sour ammonium, magnesium sulfate；
6th, solid phase obtained by step 5 is dissolved with after hot wash with strong base solution, separation of solid and liquid, gained solid phase is hydrogen-oxygen
Change chromium, gained liquid phase is sodium aluminate solution；
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Preferably, methods described is further comprising the steps of：Liquid phase evaporative crystallization obtained by step 5 is obtained into ammonium sulfate and sulphur
The mixture of sour magnesium, the mixture can be used for preparing nitrogen magnesium fertilizer.
Preferably, methods described is further comprising the steps of：Aluminium hydroxide is made through Bayer process in liquid phase obtained by step 6.
Preferably, diluting concentrated sulfuric acid to concentration is 50%~80% in the step 1.
Preferably, the oxidant in the step 3 is the one or more in oxygen, air, hydrogen peroxide.
Preferably, the alkaline matter for mixed solution pH value being adjusted in the step 3 is ammoniacal liquor or ammonium hydrogen carbonate.
Preferably, the alkaline matter for mixed solution pH value being adjusted in the step 5 is ammoniacal liquor or ammonium hydrogen carbonate.
Preferably, the method for purified treatment is that iron removing reagent is added into mixed solution in the step 5.
Preferably, the strong base solution in the step 6 is sodium hydroxide solution or potassium hydroxide solution.
Preferably, in the step 6 highly basic dissolve temperature be 50~80 DEG C, after dissolving solution ph be 10.5~
11.5。
Method of the present invention using chromite as raw material clean manufacturing chrome green has following excellent compared with prior art
Point：
Method of the present invention using chromite as raw material clean manufacturing chrome green, for existing chrome green production. art
Existing deficiency, by the cycling of elements in chromite it is sulfate after sulfuric acid dissolution using chromite as raw material, and uses yellow ammonium
Siderotil iron removal technology high-efficient deferrization, realize that chromite ferrochrome separates.Solution after purification extracts hydrogen through overregulating the basicity of solution
Chromium oxide, aluminium hydroxide, realize that chromium, aluminium separate by the nature difference of chromium hydroxide, aluminium hydroxide in aqueous slkali, carry respectively
Chromium hydroxide, aluminium hydroxide are taken, chromium hydroxide is scrubbed, calcining prepares chrome green product after drying.Present invention process pair
Product is aluminium hydroxide and ammonium sulfate, sulfuric acid magnesium compound, has diversification available for metallurgical and fertilizer industry, technology path
Feature, its application will provide a kind of production method of high-efficiency cleaning for the preparation of chrome green.
Brief description of the drawings
Fig. 1 is the process chart of the production method of chrome green in embodiment 1.
Embodiment
The composition of chromite used is in following examples：Cr2O340.43%th, FeO29.76%th, MgO 10.87%,
Al2O316.42%th, SiO20.65%, the composition of chromite is alternatively other concrete contents, but is not limited to the present invention's
Protection domain.
Embodiment 1
The production method of the present embodiment chrome green is as shown in figure 1, it is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 58% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 125 DEG C of reactions
1h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with the air and hydrogen peroxide for not being introduced into other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing
The ammoniacal liquor for having ammonium ion adjusts mixed solution pH value to 2.7；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 115 DEG C of holding 1h, solid-liquid
Separation, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammoniacal liquor regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromium hydroxide and aluminium hydroxide
Thing, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
6th, will with 55 DEG C, pH value be 10.8 sodium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 2
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 80% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 120 DEG C of reactions
1.2h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the oxygen of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate adjust mixed solution pH value to 2.8；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 110 DEG C of holding 3.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammonium hydrogen carbonate regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is chromium hydroxide and aluminium hydroxide
Mixture, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
6th, will with 65 DEG C, pH value be 11 sodium hydroxide solutions after solid phase hot wash obtained by step 5, separation of solid and liquid,
Gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 3
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 70% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 130 DEG C of reactions
3h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the oxygen, air and hydrogen peroxide of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3 +, mixed solution pH value is adjusted to 3 with the ammoniacal liquor containing ammonium ion or ammonium hydrogen carbonate；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 120 DEG C of holding 0.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammonium hydrogen carbonate regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is chromium hydroxide and aluminium hydroxide
Mixture, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
6th, will with 66 DEG C, pH value be 11.5 potassium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 4
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 50% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 137 DEG C of reactions
2.4h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the air of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate adjust mixed solution pH value to 2.9；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 160 DEG C of holding 4h, solid-liquid
Separation, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammoniacal liquor regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromium hydroxide and aluminium hydroxide
Thing, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
6th, will with 50 DEG C, pH value be 11.3 sodium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 5
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 75% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 150 DEG C of reactions
2.5h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with the oxygen and hydrogen peroxide for not being introduced into other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing
The ammonium hydrogen carbonate for having ammonium ion adjusts mixed solution pH value to 2.6；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 140 DEG C of holding 5h, solid-liquid
Separation, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammoniacal liquor regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromium hydroxide and aluminium hydroxide
Thing, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
6th, will with 60 DEG C, pH value be 11.2 sodium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 6
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 65% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 145 DEG C of reactions
1.6h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the hydrogen peroxide of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium from
The ammonium hydrogen carbonate of son adjusts mixed solution pH value to 2.5；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 125 DEG C of holding 2.8h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammoniacal liquor regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromium hydroxide and aluminium hydroxide
Thing, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
6th, will with 75 DEG C, pH value be 10.5 sodium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 7
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 55% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 140 DEG C of reactions
1.8h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the air of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate adjust mixed solution pH value to 2.6；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 135 DEG C of holding 2.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammonium hydrogen carbonate regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is chromium hydroxide and aluminium hydroxide
Mixture, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
6th, will with 70 DEG C, pH value be 10.6 potassium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 8
The chrome green of the present embodiment is prepared according to the following steps：
First, the amount of 200g chromites concentrated sulfuric acid according to needed for the cubage reaction of metallic element chromium in chromite is weighed
380g, and be 60% by required diluting concentrated sulfuric acid to concentration；
2nd, dilute sulfuric acid, chromite and 20g chromic anhybrides that step 1 is prepared are sequentially added in pressure-resistant kettle, 135 DEG C of reactions
2h, separation of solid and liquid, gained liquid phase are chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；
3rd, with not being introduced into the oxygen of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammoniacal liquor adjust mixed solution pH value to 2.5；
4th, the mixed solution for treating step 3 is added in pressure-resistant kettle, is heated to temperature as 130 DEG C of holding 2h, solid-liquid
Separation, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；
5th, after the mixed solution after iron removaling in step 4 further being added into iron removing reagent progress purified treatment, addition contains
After the pH value of the ammonium hydrogen carbonate regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is chromium hydroxide and aluminium hydroxide
Mixture, gained liquid phase are ammonium sulfate, the mixed solution of magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
6th, will with 80 DEG C, pH value be 10.7 potassium hydroxide solutions after solid phase hot wash obtained by step 5, solid-liquid divides
From gained solid phase is chromium hydroxide, and gained liquid phase is sodium aluminate solution, and aluminium hydroxide further is made through Bayer process.
7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made.
Embodiment 1~8Cr2O3 the conversion ratios of table 1
From table 1 it follows that Cr made from embodiment 1~82O3Conversion ratio is more than 98%, higher than existing product
Conversion ratio 97%.
The Cr that the embodiment 1~8 of table 2 is prepared2O3Purity
From Table 2, it can be seen that Cr made from embodiment 1~82O3Purity is more than 99%, apparently higher than existing product
Middle Cr2O3Purity 98%.
As seen from the above embodiment, method of the invention not only can with it is pollution-free, cleaning production chrome green, and its
High conversion rate, products obtained therefrom purity are high, while can also obtain accessory substance：Aluminium hydroxide and ammonium sulfate, sulfuric acid magnesium compound, can
There is the characteristics of diversification for metallurgical and fertilizer industry, technology path, its application will provide one for the preparation of chrome green
The production method of kind high-efficiency cleaning.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (9)
- A kind of 1. method using chromite as raw material clean manufacturing chrome green, it is characterised in that described method include with Lower step：First, according in chromite metallic element chromium cubage reaction needed for the concentrated sulfuric acid amount, by required diluting concentrated sulfuric acid；2nd, dilute sulfuric acid, chromite, the chromic anhybride prepared step 1 are sequentially added in pressure-resistant kettle, at a temperature of 120~150 DEG C 1~3h, separation of solid and liquid are reacted, gained liquid phase is chromium sulfate, ferric sulfate, magnesium sulfate, the mixed solution of aluminum sulfate；3rd, with not being introduced into the oxidants of other impurities by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion Alkaline matter adjusts mixed solution pH value to 2.5~3；4th, the treated mixed solution of step 3 is added in pressure-resistant kettle, be heated to temperature keep 0.5 for 110~160 DEG C~ 5h, separation of solid and liquid, gained solid phase are ammonium iron alum, and gained liquid phase is the mixed solution after iron removaling；5th, the alkaline matter containing ammonium ion after the mixed solution purified treatment after iron removaling in step 4, will be added and adjusts solution PH value be 7.0 after, solid-liquor separation, gained solid phase is the mixture of chromium hydroxide and aluminium hydroxide, gained liquid phase be ammonium sulfate, The mixed solution of magnesium sulfate；6th, solid phase obtained by step 5 is dissolved with after hot wash with strong base solution, separation of solid and liquid, gained solid phase is hydroxide Chromium, gained liquid phase are sodium aluminate solution；7th, chromium hydroxide obtained by step 6 is calcined after hot wash, drying, that is, chrome green is made；Methods described is further comprising the steps of：Liquid phase evaporative crystallization obtained by step 5 is obtained into the mixing of ammonium sulfate and magnesium sulfate Thing.
- 2. the method using chromite as raw material clean manufacturing chrome green according to claim 1, it is characterised in that described Method is further comprising the steps of：Aluminium hydroxide is made through Bayer process in liquid phase obtained by step 6.
- 3. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：Diluting concentrated sulfuric acid to concentration is 50%~80% in the step 1.
- 4. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：Oxidant in the step 3 is oxygen, the one or more in air, hydrogen peroxide.
- 5. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：The alkaline matter that mixed solution pH value is adjusted in the step 3 is ammoniacal liquor or ammonium hydrogen carbonate.
- 6. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：The alkaline matter that mixed solution pH value is adjusted in the step 5 is ammoniacal liquor or ammonium hydrogen carbonate.
- 7. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：The method of purified treatment is that iron removing reagent is added into mixed solution in the step 5.
- 8. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：Strong base solution in the step 6 is sodium hydroxide solution or potassium hydroxide solution.
- 9. the method using chromite as raw material clean manufacturing chrome green according to any one of claim 1-2, its It is characterised by：The temperature that highly basic dissolves in the step 6 is 50~80 DEG C.
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| CN101979679A (en) * | 2010-10-19 | 2011-02-23 | 东北大学 | Method for treating chromite by sulfuric acid leaching |
| CN105016388A (en) * | 2014-04-17 | 2015-11-04 | 唐翔 | Clean, energy-saving and environment-friendly chromium compound manufacturing technology by utilizing carbon ferrochrome |
| CN105366723A (en) * | 2014-08-21 | 2016-03-02 | 中国科学院过程工程研究所 | Method for producing chromic oxide from carbon ferrochrome |
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