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Preparation process for iron oxide black

A technology of iron oxide black and preparation process, applied in the field of pigment preparation, can solve the problems of many by-products, poor tinting strength of iron oxide black, long oxidation time, etc., and achieves the effects of strong tinting ability, reduced contact time and high purity

Active Publication Date: 2014-10-01
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there are problems of long oxidation time and many by-products in the preparation of iron oxide black in the prior art, resulting in poor tinting strength of iron oxide black, and then providing a method of replacing oxygen-containing iron oxide with amorphous iron oxyhydroxide The method for preparing iron oxide black using body as addition raw material

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  • Preparation process for iron oxide black
  • Preparation process for iron oxide black

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Embodiment 1

[0023] Iron oxide black preparation method described in the present embodiment is as follows:

[0024] (1) Dissolve 1.5kg of ferrous sulfate heptahydrate in water to obtain ferrous sulfate solution;

[0025] (2) Add 1.3kg of potassium hydroxide to the ferrous sulfate solution in the step (1), and carry out neutralization reaction at a temperature of 20°C until the pH value of the solution is constant;

[0026] (3) Warm up the solution after the neutralization reaction in step (2) to 80°C;

[0027] (4) Add 2.625kg of amorphous ferric oxyhydroxide to the heated solution in step (3), and use 28wt% ammonia water to control the pH value of the solution to 9 during the reaction;

[0028] (5) After the reaction is completed, filter and dry the filter cake at 50°C to prepare iron oxide black pigment A.

Embodiment 2

[0030] Iron oxide black preparation method described in the present embodiment is as follows:

[0031] (1) Dissolve 1.0kg of ferrous nitrate and 1.0kg of ferrous sulfate in water to obtain a mixed solution of ferrous nitrate and ferrous sulfate;

[0032] (2) Add 1.0kg of sodium hydroxide and 0.7kg of potassium hydroxide to the mixed solution in the step (1), and carry out neutralization reaction at a temperature of 25°C until the pH value of the solution is constant at 10;

[0033] (3) Warm up the solution after the neutralization reaction in step (2) to 80°C;

[0034] (4) Add 3.0 kg of amorphous ferric oxyhydroxide to the heated solution in step (3), and use 20 wt% sodium hydroxide solution to control the pH value of the solution to 9 during the reaction;

[0035] (5) After the reaction is completed, filter and dry the filter cake at 60°C to prepare iron oxide black pigment B.

Embodiment 3

[0037] Iron oxide black preparation method described in the present embodiment is as follows:

[0038] (1) Dissolve 2.3kg of ferrous chloride in water to obtain ferrous chloride solution;

[0039] (2) Add 2.2kg of potassium carbonate to the ferrous chloride solution in the step (1), and carry out neutralization reaction at a temperature of 30°C until the pH value of the solution is constant;

[0040] (3) Warm up the solution after the neutralization reaction in step (2) to 85°C;

[0041] (4) Add 3.7kg of amorphous ferric oxyhydroxide to the heated solution in step (3), and use 28wt% ammonia water to control the pH value of the solution to 11 during the reaction;

[0042] (5) After the reaction is completed, filter and dry the filter cake at 70°C to prepare iron oxide black pigment C.

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Abstract

The invention provides a preparation process for iron oxide black, which belongs to the field of preparation of pigments. The preparation process comprises the following steps: (1) dissolving a soluble ferrous salt in water so as to obtain a soluble ferrous salt solution; (2) adding a soluble alkali solution in the soluble ferrous salt solution prepared in the step (1) and carrying out a reaction at 20 to 50 DEG C; (3) heating the reacted solution obtained in the step (2) to 80 to 90 DEG C; (4) adding amorphous FeOOH into the solution heated in the step (3) and carrying out a reaction, wherein the pH value of the solution is controlled to be 9 to 11 in the reaction; and (5) after completion of the reaction, carrying out filtering and drying so as to obtain an iron oxide black pigment. The iron oxide black prepared by using the process has the advantages of a single crystal structure, a small particle size, high purity and strong tinting strength.

Description

technical field [0001] The invention relates to a preparation process of iron oxide black, which belongs to the field of pigment preparation. Background technique [0002] Iron oxide black is referred to as iron black for short, its molecular formula is Fe3O4, or Fe2O3·FeO, and its chemical name is ferric oxide. Iron oxide black has saturated blue ink black, high hiding power and tinting power, and is widely used in coloring fields such as building materials, cement, ink, printing, and plastics. In recent years, the demand for iron oxide black in my country has continued to increase, with an annual growth rate of 107%, far higher than the 36.6% growth rate of the entire iron oxide pigment, and is second only to iron red and iron yellow iron pigments. [0003] Many methods for preparing iron oxide black have been disclosed in the prior art. For example, Chinese patent document CN1709985A discloses a method for preparing iron oxide black, which specifically includes the foll...

Claims

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Application Information

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IPC IPC(8): C01G49/08
Inventor 王立贤刘振义白洪彬周彤邱新荣杜娟樊俐
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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