Refining method of titanium dioxide by-product ferrous sulphate

A ferrous sulfate and refining method technology, applied in the direction of ferric sulfate, can solve the problems that the pH value cannot be removed, affect the purity of ferrous sulfate, etc., and achieve the effect of high tinting strength and good hue

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 this invention is that in the prior art, the pH value condition when ferrous sulfate is refined cannot ensure that Fe 2+ Not be precipitated, so the existence of above-mentioned magnesium, manganese, zinc impurity affects the purity of ferrous sulfate, and then provides a kind of can effectively impurity magnesium, manganese, zinc are carried out precipitation and can not simultaneously Fe 2+ Precipitated ferrous sulfate refining method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Under normal temperature, utilize titanium dioxide by-product ferrous sulfate preparation concentration to be 500ml of ferrous sulfate heptahydrate solution of 350g / L, adjust the pH value of this solution with sulfuric acid to be 1, carry out titanium hydrolysis treatment to titanium dioxide by-product ferrous sulfate; Add 26g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH value to 6.0, reduce the magnesium, manganese, zinc ions to obtain the precipitation of magnesium, manganese, zinc element, add 0.09g polyacrylamide flocculation to the solution after titanium hydrolysis treatment and magnesium, manganese, zinc precipitation treatment agent, stirred, left to settle for 5 hours, and then filtered to remove the product of titanium hydrolysis and the precipitation of magnesium, manganese, and zinc, and the filtrate was the refined ferrous sulfate solution.

[0026] After testing, the content ...

Embodiment 2

[0028] At 50°C, 500ml of ferrous sulfate heptahydrate solution with a concentration of 370g / L was prepared by using ferrous sulfate, a by-product of titanium dioxide, and the pH value of the solution was adjusted to 1.5 with sulfuric acid, and titanium dioxide was hydrolyzed by ferrous sulfate, a by-product of titanium dioxide. treatment; then add 28g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH to 6.1, reduce the magnesium, manganese and zinc ions to obtain the precipitation of magnesium, manganese and zinc, and when the solution is cooled to room temperature, add 0.09g of polyacrylamide flocculant, stirred, settled for 2 hours, and then filtered to remove the products of titanium hydrolysis and the precipitates of magnesium, manganese, and zinc, and the filtrate was the refined ferrous sulfate solution.

[0029] After testing, the content of ferrous sulfate in the refined product is 344g / L.

Embodiment 3

[0031] At 60°C, 500ml of ferrous sulfate heptahydrate solution with a concentration of 400g / L was prepared by using ferrous sulfate, a by-product of titanium dioxide, and the pH value of the solution was adjusted to 2.0 with sulfuric acid, and titanium dioxide was hydrolyzed by ferrous sulfate, a by-product of titanium dioxide. treatment; then add 30g iron powder to reduce Fe in the ferrous sulfate heptahydrate solution after titanium hydrolysis treatment 3+ And adjust the pH to 6.0, reduce the magnesium, manganese and zinc ions to obtain the precipitation of magnesium, manganese and zinc, and when the solution is cooled to room temperature, add 0.1g polyacrylamide flocculant, stirring, settling for 1.5h, and then filtering to remove titanium hydrolysis products and magnesium, manganese, zinc precipitates, and the filtrate is the refined ferrous sulfate solution.

[0032]After testing, the content of ferrous sulfate in the refined product is 372g / L.

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Abstract

The invention provides a refining method of titanium dioxide by-product ferrous sulphate. The method comprises: (1) preparing a ferrous sulfate heptahydrate solution by using the titanium dioxide by-product ferrous sulphate; (2) adjusting a pH value of the solution to 1-2.5, and performing titanium hydrolysis of the titanium dioxide by-product ferrous sulphate; (3) adding iron powder or iron sheets into the ferrous sulfate heptahydrate solution after the titanium hydrolysis, reducing Fe<3+> in the solution, adjusting a pH value of the solution to 6.0-6.5, and performing a magnesium, manganese and zinc precipitation treatment for the titanium dioxide by-product ferrous sulphate; and (4) adding a flocculating agent into the above solution, stirring, standing, settling and filtering to obtain the refined ferrous sulphate solution. The method can effectively remove impurities such as titanium, magnesium, zinc, manganese and other ions in the titanium dioxide by-product ferrous sulphate, and obtain the high-purity refined ferrous sulphate.

Description

technical field [0001] The invention relates to a method for refining ferrous sulfate, a by-product of titanium dioxide, and belongs to the technical field of chemical industry. 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 sulfuric acid method prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
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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