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

A technology of iron oxide yellow and by-products, applied in the direction of iron oxide/iron hydroxide, etc., can solve the problems of ineffective control of seed nucleation and growth of crystal nuclei, influence of iron oxide yellow color, mixed cylindrical seeds, etc. , achieve high tinting strength, improve dispersibility, and good impurity removal 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 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 a one-step reaction under the condition of ventilating air, resulting in reaction There are few seeds generated in the process, and the nucleation and growth of the seeds cannot be effectively controlled, resulting in the mixing of cylindrical seeds in the 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

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) Refining of ferrous sulfate

[0047] At 10°C, use titanium dioxide by-product ferrous sulfate to prepare 500ml of ferrous sulfate heptahydrate solution with a concentration of 350g / L, adjust the pH value of the solution to 1 with sulfuric acid, and carry out titanium dioxide by-product ferrous sulfate. Hydrolysis treatment to generate Ti 2 O·H 2 O complexes;

[0048] Add 0.09g of polyacrylamide to the above solution, stir and filter after standing to settle to remove Ti 2 O·H 2 O complex, the filtrate is the refined ferrous sulfate solution;

[0049] (2)Fe(OH) 2 generation

[0050] Take 375ml of the refined ferrous sulfate solution and add 9g of 30wt% NaOH solution, carry out neutralization reaction at 10°C, control the pH value of the system to 6.0, and neutralize when the white precipitate generated in the solution turns dark green The reaction is over;

[0051] (3) Preparation of iron oxide yellow crystal seeds

[0052] It is 200g / L that the system solut...

Embodiment 2

[0059] (1) Refining of ferrous sulfate

[0060] At 50°C, use titanium dioxide by-product ferrous sulfate to prepare 500ml of ferrous sulfate heptahydrate solution with a concentration of 350g / L, adjust the pH value of the solution to 1.5 with sulfuric acid, and carry out titanium dioxide by-product ferrous sulfate. Hydrolysis treatment to generate Ti 2 O·H 2 O complexes;

[0061] Add 0.09g of polyacrylamide flocculant to it, stir and filter after standing to settle to remove Ti 2 O·H 2 O complex, the filtrate is the refined ferrous sulfate solution;

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

[0063] Take 375ml of the refined ferrous sulfate solution and add 9.5g 30wt% NaOH solution, carry out neutralization reaction at 20°C, control the pH value of the system to 6.5, and neutralize the reaction when the white precipitate generated in the solution turns dark green End;

[0064] (3) Preparation of iron oxide yellow crystal seeds

[0065] It is 250g / L that the system solution afte...

Embodiment 3

[0072] (1) Refining of ferrous sulfate

[0073] At 60°C, use titanium dioxide by-product ferrous sulfate to prepare 500ml of ferrous sulfate heptahydrate solution with a concentration of 400g / L, adjust the pH value of the solution to 2.0 with sulfuric acid, and carry out titanium dioxide by-product ferrous sulfate. Hydrolysis treatment to generate Ti 2 O·H 2 O complexes;

[0074] Add 0.1g of polyacrylamide flocculant to it, stir, settle and filter to remove Ti 2 O·H 2 O complex, the filtrate is the refined ferrous sulfate solution;

[0075] (2)Fe(OH) 2 generation

[0076] Get the ferrous sulfate solution 375ml after described refinement, add the NaOH solution of 12g 30wt%, carry out neutralization reaction at 30 ℃, control system pH value to be 7.0, when the white precipitate of generation in the solution turns dark green, neutralize and the reaction ends;

[0077] (3) Preparation of iron oxide yellow crystal seeds

[0078] It is 300g / L that the system solution after th...

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Abstract

The invention provides a method of preparing iron oxide yellow pigment by using titanium dioxide by-product ferrous sulphate, belonging to a field of preparation method of pigment. The method comprises refining of the ferrous sulphate, neutralization reaction, seed preparation, and oxidation synthesis, the method controls a pH value of a solution during refining of the ferrous sulphate, and thus effectively removes impurities such as titanium and other impurities. 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): C01G49/02
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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