Preparation method of superfine iron oxide red pigment with high glossiness and pure red tone

Abstract

The invention mainly discloses a preparation method of a superfine iron oxide red pigment with high glossiness and pure red tone. The preparation method comprises the following steps of: preparing a solution from refined ferrous sulfate, neutralizing the solution with a mixed alkaline solution, heating to 40-50 DEG C, and oxidizing to obtain special seed crystals; carrying out secondary oxidization under the condition of existence of seed crystals, depositing generated iron sesquioxide on special crystal nucleus, neutralizing diluted ammonia water with the concentration of about 8 percent by using the generated sulfuric acid, controlling PH of the system to 3.0-5.0, continuously dropwise adding the ferrous sulfate and the diluted ammonia water, and gradually growing the crystal nucleus to form the orange red iron oxide pigment; and pulping an organic red iron oxide filter cake, and calcining at high temperature to obtain the superfine iron oxide red pigment with high glossiness and pure red tone. The preparation method disclosed by the invention has the advantages that: the superfine iron oxide red pigment with high glossiness and pure red tone is prepared by utilizing the preparation method disclosed by the invention; and the preparation method is realized by using a method of reducing the influence degree to the environment and has favorable environment-friendly effect.

Description

technical field [0001] The invention relates to a preparation method of a high-gloss pure red tone superfine iron oxide red pigment, specifically a method of using ferrous sulfate, a by-product of titanium dioxide, as a raw material, firstly preparing a crystal seed, and oxidizing ferrous sulfate in the presence of the seed crystal Made this product. Background technique [0002] Iron oxide red pigment is widely used in the coloring of paints, building materials, rubber and plastics and other products because of its non-toxic and harmless, abundant raw materials, superior performance and low price. With the widespread use of water-based paints in recent years, ordinary iron oxide red pigments can no longer meet the requirements of high gloss and high color purity. Tracing it to its cause is limited by the preparation method. The preparation of iron oxide red generally adopts the following methods at present: [0003] 1. Mixed salt method: After preparing the seed crystals...

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Problems solved by technology

[0006] 4. Iron oxide yellow calcination method: Iron oxide red pigments of various colors can be obtained by controlling the calcination temperature, but due to high oil absorption, it is difficult to obtain high-gloss pure red iron oxide red

[0007] 5. Ferrous sulfate calcination method: iron oxide red pigment with high color purity can be obtained, but a large amount of sulfide waste gas is generated during production, which requires a huge waste gas treatment device

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