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Method for producing ferric oxide black pigment from titanium pigment waste slag copperas

A technology of iron oxide black and waste residue, which is applied in the direction of fibrous fillers, etc., can solve the problems of increasing production cost, iron content, influence of color tone, and affecting the quality of pigment production, etc., and achieve the effect of improving quality, good product quality and low production cost

Inactive Publication Date: 2009-06-24
黄平峰
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Using ilmenite as raw material to produce titanium dioxide by sulfuric acid method, every ton of titanium dioxide produced will produce 3.5-4 tons of green vitriol. The main component of green vitriol is ferrous sulfate heptahydrate, which can be used to produce iron oxide series pigments. However, because the titanium white waste slag green vitriol produced by the production of titanium dioxide contains some impurities, it affects the quality of the produced pigments. For example, when producing iron oxide black pigments, since the titanium white waste slag green vitriol contains free sulfuric acid and titanyl sulfate, Free sulfuric acid content is about 0.5-1.0%, titanium content (as TiO 2 Express) content is about 0.5-1.5%, these impurities will have a great impact on the iron content, color and other indicators of the product, and removing these impurities will increase the production cost

Method used

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Embodiment Construction

[0007] The inventive method mainly comprises three processes of purification, neutralization and oxidation, and the specific implementation method is:

[0008] 1 Purification:

[0009] In the dissolving tank with stirring, add a certain amount of water, then add titanium dioxide waste slag vitriol and stir to control the concentration of ferrous sulfate (according to FeSO 4 ·7H 2 O meter) in the range of 350-600g / l, and make it dissolve by steam, the temperature is raised to 60-100 ℃, add calcium carbonate while stirring, and described calcium carbonate can be heavy calcium carbonate and / or light calcium carbonate Heavy calcium carbonate, among which heavy calcium carbonate such as limestone powder, double fly powder, calcite powder, etc., or other main chemical components are CaCO 3 When the pH value reaches 3-5, it is the end point, and the heat preservation is continued for no less than 30 minutes to ensure that the titanium oxysulfate is fully hydrolyzed, and the suspens...

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Abstract

The method for producing iron oxide black pigment with titanium dioxide waste slag green vitriol is characterized in that: dissolving titanium white waste slag green vitriol in water, heating with steam, controlling the temperature at 60-100°C, slowly adding calcium carbonate powder, and adjusting the pH value 3-5, keep warm for no less than 30 minutes, clarify or filter the turbid solution to obtain a light green transparent ferrous sulfate solution; neutralize the ferrous sulfate solution with caustic soda or liquid ammonia to a pH value of 7-10; then use air The iron oxide black slurry is obtained by oxidation, and the iron oxide black slurry is sequentially washed with water, press-filtered, dried, and pulverized to obtain an iron black product. When using the inventive method to purify the titanium white waste slag green vitriol aqueous solution, the titanium content in the ferrous sulfate aqueous solution can be reduced to no more than 0.05%, thereby greatly improving the quality of the iron oxide black pigment product. The advantages of simplicity and low production cost.

Description

technical field [0001] The invention relates to a method for producing pigments, in particular to a method for producing iron oxide black pigments by using titanium dioxide waste slag vitriol. Background technique [0002] Using ilmenite as raw material to produce titanium dioxide by sulfuric acid method, every ton of titanium dioxide produced will produce 3.5-4 tons of green vitriol. The main component of green vitriol is ferrous sulfate heptahydrate, which can be used to produce iron oxide series pigments. However, because the titanium white waste slag green vitriol produced by the production of titanium dioxide contains some impurities, it affects the quality of the produced pigments. For example, when producing iron oxide black pigments, since the titanium white waste slag green vitriol contains free sulfuric acid and titanyl sulfate, Free sulfuric acid content is about 0.5-1.0%, titanium content (as TiO 2 Express) content is about 0.5-1.5%, and these impurity can have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/24
Inventor 黄平峰
Owner 黄平峰