CN106186067A - A kind of method producing chromic oxide for raw material cleaning with chromite - Google Patents
A kind of method producing chromic oxide for raw material cleaning with chromite Download PDFInfo
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- CN106186067A CN106186067A CN201610526889.6A CN201610526889A CN106186067A CN 106186067 A CN106186067 A CN 106186067A CN 201610526889 A CN201610526889 A CN 201610526889A CN 106186067 A CN106186067 A CN 106186067A
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- chromic oxide
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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 producing chromic oxide for raw material cleaning with chromite.Described method uses chromite to be raw material, with chromic anhydride for oxidant through sulphuric acid dissolution, the element mixed solution such as chromic sulfate, iron sulfate is obtained after dissolution, utilize ammonium salt iron removal technology, realize ferrochrome in solution to separate, acidity precipitation chromic oxide gel, the aluminium hydroxide of the mixed solution after being separated by regulation, ammonium sulfate, the mixed solution of magnesium sulfate after precipitation chromium, aluminum prepare nitrogen magnesium fertilizer by evaporative crystallization.The chromic oxide gel obtained, the molten rear solid-liquor separation of aluminium hydroxide alkali obtaining chromic oxide gel 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 side-product is aluminium hydroxide and ammonium sulfate, magnesium sulfate mixture, does not produce refuse and pollution, synthesizes low cost, and energy consumption is low, produces chromic oxide field in green and has huge popularization and application potentiality.
Description
Technical field
The present invention relates to the preparation field of crome metal and chromic salts thereof, be specifically related to a kind of with chromite for raw material cleaning production
The method of chromic oxide.
Background technology
Chromic oxide is (also known as chrome oxide green Cr2O3) it is widely used in metallurgy and chemical industry.Because it has good stablizing
Property is also used for paint, glass, enamel, cement coloring agent, simultaneously can be used for organic catalyst.
Chromic oxide preparation method includes: reducing process (with sodium dichromate or potassium dichromate and ammonium sulfate or ammonium chloride,
The mixing such as sulfur carries out reduction and fires), the side such as thermal decomposition method (preparing with chromic anhydride or Ammonium bichromate., chromic oxide gel thermal decomposition)
Method.The preparation of external chromic oxide mainly uses sodium dichromate thermal reduction, is mixed with ammonium sulfate by sodium dichromate and reflection
Reaction in furnace, furnace charge prepares chromic oxide through high-temperature calcination after hot wash removes sodium salt.Domestic main employing chromic anhydride
Thermal decomposition method, makes chromic acid be changed into chromic oxide through high-temperature calcination analysis oxygen chromic anhydride.Above-mentioned route is by chromium mostly
Iron mine first prepares sexavalence chromic salts through alkaline process, then is prepared chromic oxide by sexavalence chromic salts, cannot avoid Cr VI in production process
Pollution problem, and production process is raw materials used is all sodium chromate deep processed product, there is also that preparation cost is higher, energy consumption is high
Problem.
Summary of the invention
The present invention is with chromite as raw material, it is provided that a kind of low energy consumption, pollution-free, disclosure satisfy that industrial three oxidations two
Chromium clean environment firendly production method, in order to solve the existing defect existed with sexavalence chromic salts for raw material production chromic oxide technology.
For achieving the above object, the invention provides a kind of side producing chromic oxide with chromite for raw material cleaning
Method.Specifically, the method comprises the steps:
One, according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite, by dilute for required concentrated sulphuric acid
Release；
Two, the dilute sulfuric acid step one prepared, chromite, chromic anhydride are sequentially added in pressure still, 120～150 DEG C of temperature
The lower reaction 1～3h of degree, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxidant of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium from
The alkaline matter regulation mixed solution pH value of son is to 2.5～3；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 110～160 DEG C of holdings 0.5
～5h, solid-liquid separation, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, by step 4 except the mixed solution purified treatment after ferrum after, add the alkaline matter regulation containing ammonium ion
After the pH value of solution is 7.0, solid-liquor separation, gained solid phase is the mixture of chromic oxide gel and aluminium hydroxide, and gained liquid phase is sulfur
Acid ammonium, the mixed solution of magnesium sulfate；
Six, will dissolve with strong base solution after step 5 gained solid phase hot wash, solid-liquid separation, gained solid phase is hydrogen-oxygen
Changing chromium, gained liquid phase is sodium aluminate solution；
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Preferably, described method is further comprising the steps of: step 5 gained liquid phase evaporative crystallization is obtained ammonium sulfate and sulfur
The mixture of acid magnesium, this mixture can be used for preparing nitrogen magnesium fertilizer.
Preferably, described method is further comprising the steps of: through Bayer process, step 6 gained liquid phase is prepared aluminium hydroxide.
Preferably, in described step one, diluting concentrated sulfuric acid to concentration is 50%～80%.
Preferably, the oxidant in described step 3 is one or more in oxygen, air, hydrogen peroxide.
Preferably, the alkaline matter regulating mixed solution pH value in described step 3 is ammonia or ammonium hydrogen carbonate.
Preferably, the alkaline matter regulating mixed solution pH value in described step 5 is ammonia or ammonium hydrogen carbonate.
Preferably, in described step 5, the method for purified treatment is addition iron removing reagent in mixed solution.
Preferably, the strong base solution in described step 6 is sodium hydroxide solution or potassium hydroxide solution.
Preferably, in described step 6 highly basic dissolve temperature be 50～80 DEG C, after dissolving solution ph be 10.5～
11.5。
The method that the present invention produces chromic oxide with chromite for raw material cleaning compared with prior art has the most excellent
Point:
The method that the present invention produces chromic oxide with chromite for raw material cleaning, for existing chromic oxide production. art
The deficiency existed, with chromite as raw material, is sulfate by the cycling of elements in chromite after sulphuric acid dissolution, and uses yellow ammonium
Siderotil iron removal technology high-efficient deferrization, it is achieved chromite ferrochrome separates.Solution after purification extracts hydrogen through the basicity overregulating solution
Chromium oxide, aluminium hydroxide, realize chromium, aluminum separation by chromic oxide gel, the aluminium hydroxide nature difference in aqueous slkali, carry respectively
Taking chromic oxide gel, aluminium hydroxide, chromic oxide product is prepared in chromic oxide gel calcining scrubbed, dried.Present invention process is secondary
Product is aluminium hydroxide and ammonium sulfate, magnesium sulfate mixture, can be used for metallurgy and fertilizer industry, and technology path has diversification
Feature, the preparation for chromic oxide is provided the production method of a kind of high-efficiency cleaning by its application.
Accompanying drawing explanation
Fig. 1 is the process chart of the production method of chromic oxide in embodiment 1.
Detailed description of the invention
The composition of chromite used in following example is: Cr2O340.43%, FeO29.76%, MgO 10.87%,
Al2O316.42%, SiO20.65%, the composition of chromite is alternatively other concrete content, but is not limited to the present invention's
Protection domain.
Embodiment 1
The production method of the present embodiment chromic oxide is as it is shown in figure 1, it is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 58% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 125 DEG C of reactions
1h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the air of other impurity and hydrogen peroxide by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing
There is the ammonia regulation mixed solution pH value of ammonium ion to 2.7；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 115 DEG C of holding 1h, solid-liquid
Separating, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, addition contains
After the pH value of the ammonia regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromic oxide gel and aluminium hydroxide
Thing, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
Six, by after step 5 gained solid phase hot wash with 55 DEG C, pH value be 10.8 sodium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 2
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 80% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 120 DEG C of reactions
1.2h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxygen of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate regulation mixed solution pH value to 2.8；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 110 DEG C of holding 3.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, 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 chromic oxide gel and aluminium hydroxide
Mixture, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
Six, by after step 5 gained solid phase hot wash with 65 DEG C, pH value be 11 sodium hydroxide solutions, solid-liquid separation,
Gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 3
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 70% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 130 DEG C of reactions
3h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxygen of other impurity, air and hydrogen peroxide by the Fe in mixed solution2+It is fully oxidized to Fe3 +, regulate mixed solution pH value to 3 with the ammonia containing ammonium ion or ammonium hydrogen carbonate；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 120 DEG C of holding 0.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, 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 chromic oxide gel and aluminium hydroxide
Mixture, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
Six, by after step 5 gained solid phase hot wash with 66 DEG C, pH value be 11.5 potassium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 4
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 50% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 137 DEG C of reactions
2.4h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the air of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate regulation mixed solution pH value to 2.9；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 160 DEG C of holding 4h, solid-liquid
Separating, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, addition contains
After the pH value of the ammonia regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromic oxide gel and aluminium hydroxide
Thing, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
Six, by after step 5 gained solid phase hot wash with 50 DEG C, pH value be 11.3 sodium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 5
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 75% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 150 DEG C of reactions
2.5h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxygen of other impurity and hydrogen peroxide by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing
There is the ammonium hydrogen carbonate regulation mixed solution pH value of ammonium ion to 2.6；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 140 DEG C of holding 5h, solid-liquid
Separating, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, addition contains
After the pH value of the ammonia regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromic oxide gel and aluminium hydroxide
Thing, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
Six, by after step 5 gained solid phase hot wash with 60 DEG C, pH value be 11.2 sodium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 6
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 65% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 145 DEG C of reactions
1.6h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the hydrogen peroxide of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium from
The ammonium hydrogen carbonate regulation mixed solution pH value of son is to 2.5；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 125 DEG C of holding 2.8h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, addition contains
After the pH value of the ammonia regulation solution of ammonium ion is 7.0, solid-liquor separation, gained solid phase is the mixing of chromic oxide gel and aluminium hydroxide
Thing, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixing of ammonium sulfate and magnesium sulfate
Thing.
Six, by after step 5 gained solid phase hot wash with 75 DEG C, pH value be 10.5 sodium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 7
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 55% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 140 DEG C of reactions
1.8h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the air of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonium hydrogen carbonate regulation mixed solution pH value to 2.6；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 135 DEG C of holding 2.5h, Gu
Liquid separates, and gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, 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 chromic oxide gel and aluminium hydroxide
Mixture, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
Six, by after step 5 gained solid phase hot wash with 70 DEG C, pH value be 10.6 potassium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Embodiment 8
The chromic oxide of the present embodiment is prepared according to the following steps:
One, 200g chromite is weighed according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite
380g, and be 60% by required diluting concentrated sulfuric acid to concentration；
Two, dilute sulfuric acid, chromite and the 20g chromic anhydride step one prepared are sequentially added in pressure still, 135 DEG C of reactions
2h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxygen of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Ammonia regulation mixed solution pH value to 2.5；
Four, mixed solution step 3 processed adds in pressure still, and being heated to temperature is 130 DEG C of holding 2h, solid-liquid
Separating, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, will add after iron removing reagent carries out purified treatment further except the mixed solution after ferrum in step 4, 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 chromic oxide gel and aluminium hydroxide
Mixture, gained liquid phase is the mixed solution of ammonium sulfate, magnesium sulfate, and further evaporative crystallization obtains the mixed of ammonium sulfate and magnesium sulfate
Compound.
Six, by after step 5 gained solid phase hot wash with 80 DEG C, pH value be 10.7 potassium hydroxide solutions, solid-liquid divides
From, gained solid phase is chromic oxide gel, and gained liquid phase is sodium aluminate solution, prepares aluminium hydroxide through Bayer process further.
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
Table 1 embodiment 1～8Cr2O3 conversion ratio
From table 1 it follows that the Cr that embodiment 1～8 prepares2O3Conversion ratio is all more than 98%, higher than existing product
Conversion ratio 97%.
The Cr that table 2 embodiment 1～8 prepares2O3Purity
From Table 2, it can be seen that the Cr that embodiment 1～8 prepares2O3Purity is all more than 99%, apparently higher than existing product
Middle Cr2O3Purity 98%.
As seen from the above embodiment, the method for the present invention is possible not only to pollution-free, the production chromic oxide of cleaning, and its
Conversion ratio is high, products obtained therefrom purity high, can also obtain by-product simultaneously: aluminium hydroxide and ammonium sulfate, magnesium sulfate mixture, can
For metallurgical and fertilizer industry, technology path has the feature of diversification, and the preparation for chromic oxide is provided one by its application
Plant the production method of high-efficiency cleaning.
Although, the present invention is described in detail to have used general explanation and specific embodiment, but at this
On the basis of invention, can make some modifications or improvements it, 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 (10)
1. one kind with chromite be raw material cleaning produce chromic oxide method, it is characterised in that described method include with
Lower step:
One, according to the amount of the required concentrated sulphuric acid of cubage reaction of metallic element chromium in chromite, by required diluting concentrated sulfuric acid；
Two, the dilute sulfuric acid step one prepared, chromite, chromic anhydride are sequentially added in pressure still, at a temperature of 120～150 DEG C
Reaction 1～3h, solid-liquid separation, gained liquid phase is the mixed solution of chromic sulfate, iron sulfate, magnesium sulfate, aluminum sulfate；
Three, with not introducing the oxidant of other impurity by the Fe in mixed solution2+It is fully oxidized to Fe3+, with containing ammonium ion
Alkaline matter regulation mixed solution pH value is to 2.5～3；
Four, the mixed solution that step 3 processed adds in pressure still, be heated to temperature be 110～160 DEG C keep 0.5～
5h, solid-liquid separation, gained solid phase is ammonium iron alum, and gained liquid phase is except the mixed solution after ferrum；
Five, by step 4 except the mixed solution purified treatment after ferrum after, add the alkaline matter regulation solution containing ammonium ion
PH value be 7.0 after, solid-liquor separation, gained solid phase is the mixture of chromic oxide gel and aluminium hydroxide, gained liquid phase be ammonium sulfate,
The mixed solution of magnesium sulfate；
Six, will dissolve with strong base solution after step 5 gained solid phase hot wash, solid-liquid separation, gained solid phase is hydroxide
Chromium, gained liquid phase is sodium aluminate solution；
Seven, step 6 gained chromic oxide gel is calcined after hot wash, drying, i.e. prepare chromic oxide.
The method producing chromic oxide with chromite for raw material cleaning the most according to claim 1, it is characterised in that described
Method is further comprising the steps of: step 5 gained liquid phase evaporative crystallization obtains the mixture of ammonium sulfate and magnesium sulfate.
The method producing chromic oxide with chromite for raw material cleaning the most according to claim 1, it is characterised in that described
Method is further comprising the steps of: through Bayer process, step 6 gained liquid phase is prepared aluminium hydroxide.
4. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: in described step one, diluting concentrated sulfuric acid to concentration is 50%～80%.
5. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: the oxidant in described step 3 is one or more in oxygen, air, hydrogen peroxide.
6. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: the alkaline matter regulating mixed solution pH value in described step 3 is ammonia or ammonium hydrogen carbonate.
7. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: the alkaline matter regulating mixed solution pH value in described step 5 is ammonia or ammonium hydrogen carbonate.
8. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: in described step 5, the method for purified treatment is for adding iron removing reagent in mixed solution.
9. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: the strong base solution in described step 6 is sodium hydroxide solution or potassium hydroxide solution.
10. according to the method producing chromic oxide for raw material cleaning with chromite according to any one of claim 1-3, its
It is characterised by: the temperature that in described step 6, highly basic dissolves is 50～80 DEG C.
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| CN110015689A (en) * | 2019-05-22 | 2019-07-16 | 徐鑫磊 | High carbon ferro-chrome clean manufacturing chromium oxyhydroxide, the production technology of chromic salts series of products |
| CN110655109A (en) * | 2019-10-14 | 2020-01-07 | 宁夏中科欧德科技有限公司 | Preparation process of high-purity chromium sesquioxide |
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| CN111977700A (en) * | 2020-08-31 | 2020-11-24 | 湖北振华化学股份有限公司 | Method for separating and recovering chromium, iron, aluminum and magnesium from mixed solution |
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| CN110655109A (en) * | 2019-10-14 | 2020-01-07 | 宁夏中科欧德科技有限公司 | Preparation process of high-purity chromium sesquioxide |
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| CN112048619A (en) * | 2020-08-31 | 2020-12-08 | 湖北振华化学股份有限公司 | Method for separating and recovering chromium, iron, aluminum and magnesium from mixed solution |
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