Method for preparing iron oxide red from pyrite roasting residues by using hydrothermal method
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A technology of pyrite slag and iron oxide red, applied in the field of pigments
Inactive Publication Date: 2015-04-22
CHANGSHU ROCKWOOD PIGMENT
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Problems solved by technology
At present, there are few reports on the preparation of iron ox
Method used
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Embodiment 1
[0017] Add 40wt% sulfuric acid solution to the reaction device, slowly add pyrite slag, react at a temperature of 110°C for 5 hours, filter the pulp to obtain acid leaching solution, dilute, adjust the concentration of ferrous iron with hydrogen peroxide to make the Fe in the solution 2+ The amount of substance and Fe 3+ The ratio of the amount of substances is 0.1, add 25wt% concentrated ammonia water to adjust the pH to 8, stir well, and obtain the Fe(OH) of the precursor 3 and Fe(OH) 2 For colloid, transfer the precursor into an autoclave, conduct a hydrothermal reaction at 160°C for 2 hours, and the reaction product is washed, filtered, dried at 100°C for 2 hours, and crushed to obtain the iron oxide red product.
Embodiment 2
[0019] Add 60wt% sulfuric acid solution to the reaction device, slowly add pyrite slag, the reaction temperature is 120 ° C for 3 hours, filter the pulp to obtain acid leaching solution, dilute, adjust the ferrous concentration with hydrogen peroxide to make the Fe in the solution 2+ The amount of substance and Fe 3+ The ratio of the amount of substances is 0.15, adding 30wt% concentrated ammonia water to adjust the pH to 10, and stirring fully to obtain the Fe(OH) of the precursor 3 and Fe(OH) 2 Colloid, the precursor is transferred to an autoclave, and the hydrothermal reaction is carried out at 200°C for 0.5h. The reaction product is washed, filtered, dried at 120°C for 1h, and crushed, which is the iron oxide red product.
Embodiment 3
[0021] Add 50wt% sulfuric acid solution to the reaction device, slowly add pyrite slag, react at 110°C for 4 hours, filter the pulp to obtain acid leaching solution, dilute, adjust the concentration of ferrous iron with hydrogen peroxide to make the Fe in the solution 2+ The amount of substance and Fe 3+ The ratio of the amount of substances is 0.12, adding 28wt% concentrated ammonia water to adjust the pH to 9, and stirring fully to obtain the Fe(OH) of the precursor 3 and Fe(OH) 2 Colloid, the precursor is transferred to an autoclave, and the hydrothermal reaction is carried out at 180°C for 1h. The reaction product is washed, filtered, dried at 110°C for 1.5h, and crushed to obtain the iron oxide red product.
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Abstract
The invention discloses a method for preparing iron oxide red from pyrite roasting residues by using a hydrothermal method. The method comprises the following steps: adding a sulfuric acid solution into a reaction device, slowly adding the pyrite roasting residues, reacting at the reaction temperature of 110-120 DEG C for 3-5 hours, and filtering the ore pulp, thereby obtaining an acid leaching solution; diluting, regulating the ferrous concentration by using hydrogen peroxide, so that the molar ratio of Fe<2+> to Fe<3+> in the solution is 0.1-0.15, adding stronger ammonia water to regulate the pH value to be 8-10, and fully stirring, thereby obtaining Fe(OH)3 and Fe(OH)2 colloid of the precursor; transferring the precursor into a high pressure kettle, carrying out a hydrothermal reaction, and washing, filtering, drying and grinding the reaction products, thereby obtaining the iron oxide red product. According to the method disclosed by the invention, the iron oxide red product of which various quality indexes meet the first grade requirements in the national standard can be obtained, the particles refer to pseudo cubes of uniform size, and industrial high-quality ammonium sulfate can be obtained from the filtrate of the hydrothermal reaction products.
Description
technical field [0001] The invention belongs to the technical field of pigments, and relates to a method for preparing iron oxide red from pyrite slag by a hydrothermal method. Background technique [0002] Iron oxide red is an ancient and important inorganic pigment. Iron oxide red is insoluble in water and dilute acid, has no oil permeability and water permeability, has strong tinting power and hiding power, can resist acid and alkali, light, high temperature and sun exposure, and is widely used in coatings, building materials, rubber, ink, Industries such as plastics and art paints. [0003] my country's iron oxide red is mainly produced with iron scale as raw material by mixed acid method, with an annual output of more than 500,000 tons, which is the world's largest producer. Pyrite slag is the chemical waste produced by sulfuric acid when pyrite is used to prepare it. Many domestic scholars have conducted research on the preparation of iron-based products using pyri...
Claims
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Application Information
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