Method of preparing iron oxide yellow by using titanium dioxide by-product

A technology of iron oxide yellow and by-products, applied in the directions of iron oxide, iron oxide/iron hydroxide, iron sulfate, etc., can solve the problems of the color effect of iron oxide yellow, mixed cylindrical seeds, less seeds, etc. Dispersion, high tinting strength, good hue effect

Active Publication Date: 2013-06-12
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The first technical problem to be solved by the present invention is that in the prior art, after ferrous sulfate is refined, ammonia water is added to the refined ferrous sulfate, and iron oxide crystal seeds are directly generated through one-step reaction under the condition of ventilation. , resulting in few seed crystals generated during the reaction process, and the nucleation and growth of crystal nuclei cannot be effectively controlled, resulting in the mixing of cylindrical seeds in the crystal seeds, which directly affects the color of the finished iron oxide yellow.

Method used

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  • Method of preparing iron oxide yellow by using titanium dioxide by-product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Refining of ferrous sulfate

[0049] Under normal temperature, utilize titanium dioxide by-product ferrous sulfate preparation concentration to be 500ml of ferrous sulfate heptahydrate solution of 350g / L, adjust the pH value of this solution with sulfuric acid to be 1, carry out titanium hydrolysis treatment to titanium dioxide by-product ferrous sulfate; Add 26g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH value to 6.0, reduce the magnesium, manganese, zinc ions to obtain the precipitation of magnesium, manganese, zinc simple substance, add 0.09g polyacrylamide to the solution after titanium hydrolysis treatment and magnesium, manganese, zinc precipitation treatment Flocculant, stirring, settling for 5 hours and then filtering to remove the product of titanium hydrolysis and the precipitation of magnesium, manganese and zinc, and the filtrate is the refined ferrous sulfate solution; ...

Embodiment 2

[0060] (1) Refining of ferrous sulfate

[0061] At 50°C, 500ml of ferrous sulfate heptahydrate solution with a concentration of 370g / L was prepared by using ferrous sulfate, a by-product of titanium dioxide, and the pH value of the solution was adjusted to 1.5 with sulfuric acid, and titanium dioxide was hydrolyzed by ferrous sulfate, a by-product of titanium dioxide. treatment; then add 28g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH to 6.1, reduce the magnesium, manganese and zinc ions to obtain the precipitation of magnesium, manganese and zinc, and when the solution is cooled to room temperature, add 0.09g polyacrylamide flocculant, stirred, allowed to settle for 2 hours, and then filtered to remove titanium hydrolysis products and magnesium, manganese, and zinc precipitates, and the filtrate was the refined ferrous sulfate solution;

[0062] (2)Fe(OH) 2 generation

[0063] Get 375ml of t...

Embodiment 3

[0072] (1) Refining of ferrous sulfate

[0073] At 60°C, 500ml of ferrous sulfate heptahydrate solution with a concentration of 400g / L was prepared by using ferrous sulfate, a by-product of titanium dioxide, and the pH value of the solution was adjusted to 2.0 with sulfuric acid, and titanium dioxide was hydrolyzed by ferrous sulfate, a by-product of titanium dioxide. treatment; then add 30g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH to 6.0, reduce the magnesium, manganese and zinc ions to obtain the precipitation of magnesium, manganese and zinc, and when the solution is cooled to room temperature, add 0.1g of polyacrylamide flocculant, stirred, left to settle for 1.5h, and then filtered to remove titanium hydrolysis products, magnesium, manganese, and zinc precipitates, and the filtrate was the refined ferrous sulfate solution;

[0074](2)Fe(OH) 2 generation

[0075] Get 375ml of the refin...

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Abstract

The invention provides a method of preparing iron oxide yellow by using a titanium dioxide by-product ferrous sulphate, belonging to a field of chemistry. The method comprises refining of ferrous sulphate, neutralization reaction, seed preparation, and oxidation synthesis; and the method controls a pH value of a solution during refining of the ferrous sulphate, and thus effectively removes impurities such as manganese, magnesium and zinc. In addition, by separating a seed preparation process into a neutralization reaction process and a seed preparation process, a preparation process of Fe(OH)2 suspension and an oxidation process are separated, thereby effectively controlling the seed to be spindle-shaped or needle-shaped, and improving dispersibility of the seed. The method is good in impurity removal effects, and can effectively control the seed to be spindle-shaped or needle-shaped and improve dispersibility of the seed; and the prepared iron oxide yellow has advantages of good color and high tinting strength.

Description

technical field [0001] The invention relates to a method for preparing iron oxide yellow pigments from titanium dioxide by-product ferrous sulfate, belonging to the field of pigment preparation methods. Background technique [0002] Titanium dioxide is a high-grade and high-quality white inorganic pigment, which mainly has two crystal forms: anatase and rutile. Due to its superior density, dielectric constant and refractive index, it is considered to be the best white pigment in the world, and is widely used in coatings, plastics, papermaking, printing, ink and rubber industries. At present, there are two production methods of titanium dioxide: sulfuric acid method and chlorination method. Since the production process of sulfuric acid method is relatively simple, and can be produced with low-grade titanium concentrate, at present, sulfuric acid method is mainly used in my country to produce titanium dioxide. Accounted for 98%. [0003] The production of titanium dioxide by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G49/14
Inventor 周彤刘振义李丽英刘博书袁峰
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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