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High-purity iron oxide black pigment and production method thereof

A technology of iron oxide black and its production method, which is applied in the field of high-purity iron oxide black pigment and its production, can solve the problems of high yield, good shade, fineness and difficult control of product performance, and achieve good shade and fine particle size , good color hiding effect

Active Publication Date: 2012-07-11
ZHEJIANG HUAYUAN PIGMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical defect that the existing product fineness and product performance are more difficult to control, an object of the present invention is to provide a kind of production method of high-purity iron oxide black pigment, the granularity of the product that this method obtains is finer than synthetic method, Uniform, high yield and good shade; at the same time, the purity of the product is controlled to meet the requirements of the industry

Method used

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  • High-purity iron oxide black pigment and production method thereof
  • High-purity iron oxide black pigment and production method thereof

Examples

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Effect test

Embodiment 1

[0037] like figure 1 As shown, the concentration of iron oxide black in this example is 400 kg / m 3 It is formed by reacting 8495kg parts by weight of ferrous sulfate and 8150kg parts by weight of sodium hydroxide solution with a concentration of 30%.

[0038] The production method of described iron oxide black pigment comprises seed crystal preparation and two-step oxidation, and process step is as follows:

[0039] i) the seed crystal preparation part,

[0040] a) Dissolve the solid ferrous sulfate with a content of 86% in water, and then add heavy metal ion scavenger (macromolecule --- xanthate and dithiocarbamate derivatives (DTC) and sulfide --- sodium sulfide) and flocculant (polyacrylamide) added 0.005% after treatment to remove flocculent precipitates, to remove impurities and heavy metal ions in ferrous sulfate, and clarified for later use, the prepared concentration is 396kg / m 3 Ferrous sulfate solution, take a certain volume of ferrous sulfate solution, convert i...

Embodiment 2

[0049] like figure 1 As shown, the concentration of iron oxide black in this example is 450 kg / m 3 It is formed by reacting 8,800 kg by weight of ferrous sulfate and 8,445 kg by weight of 30% sodium hydroxide solution.

[0050] The production method of described iron oxide black pigment comprises seed crystal preparation and two-step oxidation, and process step is as follows:

[0051] i) the seed crystal preparation part,

[0052] a) Dissolve the solid ferrous sulfate with a content of 86% in water, and then add heavy metal ion scavenger (macromolecule --- xanthate and dithiocarbamate derivatives (DTC) and sulfide --- sodium sulfide) and flocculant (polyacrylamide) added 0.007% after treatment to remove flocculent precipitates, to remove impurities and heavy metal ions in ferrous sulfate, and clarified for later use, the prepared concentration is 452kg / m3 ferrous sulfate solution, take a certain volume of ferrous sulfate solution, convert it into a weight of 8800kg and put ...

Embodiment 3

[0061] like figure 1 As shown, the iron oxide black in this example has a concentration of 500 kg / m 3 It is formed by reacting 9,100 kg by weight of ferrous sulfate and 8,750 kg by weight of 30% sodium hydroxide solution.

[0062] The production method of described iron oxide black pigment comprises seed crystal preparation and two-step oxidation, and process step is as follows:

[0063] i) the seed crystal preparation part,

[0064] a) Dissolve the solid ferrous sulfate with a content of 86% in water, and then add heavy metal ion scavenger (macromolecule --- xanthate and dithiocarbamate derivatives (DTC) and sulfide---sodium sulfide) and flocculant (polyacrylamide) added 0.01% after treatment to remove flocculent precipitates, to remove impurities and heavy metal ions in ferrous sulfate, and clarified for later use, the prepared concentration is 498kg / m 3 Ferrous sulfate solution, take a certain volume of ferrous sulfate solution, convert it into a weight of 9100kg and pu...

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Abstract

The invention relates to a high-purity iron oxide black pigment and a production method thereof. The production method comprises the following steps of: with a crystal seed as a carrier in a liquid phase method production process, carrying out reaction on ferrous sulphate and sodium hydroxide in an oxidation barrel, immediately generating ferrous hydroxide sol under the alkali condition, introducing steam and warming for reaction, introducing air for oxidation after a specified temperature is reached, and reacting for a period of time to obtain the high-purity iron oxide black pigment. The granules of the product obtained by the method are small and uniform compared with a synthetic method, and the yield is high and the coloured light is good; meanwhile, the purity of the product is controlled, thus the operating requirement in the industry is met. The invention also aims at providing the high-purity iron oxide black pigment prepared by adopting the method.

Description

technical field [0001] The invention relates to a high-purity iron oxide black pigment and a production method thereof. Background technique [0002] High-purity iron oxide black pigment, its chemical name: ferric oxide, chemical formula: Fe 3 o 4 , is an important raw material for the production of film and tape. At present, the production of iron oxide black pigments is generally produced by synthetic methods. Sludge materials and iron red and iron yellow waste are mainly used as the main raw materials for the synthesis reaction. The products produced are not ideal in terms of fineness or product performance. , Such as iron content, sieve residue and product hue are difficult to control. [0003] Chinese invention patent (application number: 200410013151.7, application date: 2004-05-14) discloses a production method of iron oxide black, including the following steps: (1) Reduction: put reducing agent and water into the reduction reactor, Turn on the stirring, raise the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08
Inventor 竺增林冯阿荣李金花王华英倪雅娟
Owner ZHEJIANG HUAYUAN PIGMENT CO LTD
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