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Method for removing ferric iron ion contained in metatitanic acid by adopting electrolytic reduction

A technology of metatitanic acid and ferric iron, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of increased product quality fluctuations, unsolved problems, high production costs, etc., and achieve simplified production processes and excellent removal effects , the effect of reducing dosage

Active Publication Date: 2013-06-26
SHANDONG DONGJIA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, after adding aluminum powder and sulfuric acid, although the residual iron ions in metatitanic acid can be removed better, aluminum ions and sulfuric acid are added, which causes the aluminum ions of the final product to increase, and the fluctuation of product quality increases. higher production costs
So far, the problem has not been resolved

Method used

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  • Method for removing ferric iron ion contained in metatitanic acid by adopting electrolytic reduction
  • Method for removing ferric iron ion contained in metatitanic acid by adopting electrolytic reduction
  • Method for removing ferric iron ion contained in metatitanic acid by adopting electrolytic reduction

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Effect test

Embodiment 1

[0031] Prepare 100g of metatitanic acid with 0.5L deionized water to form a 200g / L slurry. After stirring evenly, slowly add sulfuric acid. The amount of sulfuric acid added is based on the mass ratio H 2 SO 4 : TiO 2 =5:1 join. Continue to stir evenly and heat until the material boils to dissolve it into a titanium sulfate solution. Cool the titanium sulfate solution to 50°C and add it to the electrolytic cell, control the electrolysis time at 1 hour, and the voltage at 0.8V, and carry out electrolysis to prepare trivalent titanium, so that the ratio of trivalent titanium to tetravalent titanium is greater than 90%; The final trivalent titanium solution is added to the raw material metatitanic acid to reduce the mixed ferric iron to ferrous iron and then washed to achieve less than 30ppm of ferric oxide, which meets the requirements of pigment grade titanium dioxide.

Embodiment 2

[0033] Prepare 100g of metatitanic acid with 0.5L deionized water to form a 200g / L slurry. After stirring evenly, slowly add sulfuric acid. The amount of sulfuric acid added is based on the mass ratio H 2 SO 4 : TiO 2 =4:1 join. Continue to stir evenly and heat until the material boils to dissolve it into titanium sulfate. Cool the titanium sulfate solution to 40°C and add it to the electrolytic cell, control the electrolysis time at 1.5 hours, and the voltage at 1.0V, and perform electrolysis to prepare trivalent titanium, so that the ratio of trivalent titanium to tetravalent titanium is greater than 90%; The final trivalent titanium solution is added to the raw material metatitanic acid to reduce the mixed ferric iron to ferrous iron and then washed to achieve less than 30ppm of ferric oxide, which meets the requirements of pigment grade titanium dioxide.

Embodiment 3

[0035] Prepare 100g of metatitanic acid with 0.5L deionized water to form a 200g / L slurry. After stirring evenly, slowly add sulfuric acid. The amount of sulfuric acid added is based on the mass ratio H 2 SO 4 : TiO 2 =6:1 join. Continue to stir evenly and heat until the material boils to dissolve it into titanium sulfate. Cool the titanium sulfate solution to 60°C and add it to the electrolytic cell, control the electrolysis time at 2 hours, and the voltage at 1.1V, and perform electrolysis to prepare trivalent titanium, so that the ratio of trivalent titanium to tetravalent titanium is greater than 90%; The final trivalent titanium solution is added to the raw material metatitanic acid to reduce the mixed ferric iron to ferrous iron and then washed to achieve less than 30ppm of ferric oxide, which meets the requirements of pigment grade titanium dioxide.

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Abstract

The invention relates to the technical field of preparation of titanium dioxide pigments, and particularly relates to a method for preparing titanous ions by acidifying and then electrolytically reducing metatitanic acid. The method comprises the following steps of: firstly acidifying the metatitanic acid; then electrolyzing to prepare a titanous solution; and finally adding the obtained titanous solution to the raw material metatitanic acid to reduce ferric iron into ferrous iron, and then washing. Compared with the traditional method, the method disclosed by the invention is unnecessary to add the aluminum powder, reduces the usage amount of sulfuric acid, simplifies the production process, saves the production cost and has the advantages of environment protection, safety, easiness for operation, low content of aluminum contained in products and product quality enhancement.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide pigment preparation, in particular to a method for removing ferric ions in metatitanic acid by electrolytic reduction. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is the best white pigment because of its good optical properties, and is widely used in coatings, papermaking, plastics and other fields. At present, the production technology of titanium dioxide is mainly two cores, one is to give the performance of titanium dioxide pigment, the other is to purify the production process of titanium dioxide and remove impurities, and the biggest impurity is iron. When the content of iron exceeds 30ppm, the human eye You can see the yellow hue, which affects the pigment indicators such as whiteness and gloss of titanium dioxide, and when calcined at high temperature, iron is easily decomposed into iron oxide with the same microcrystalline structure as titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 李化全张斌郭传华孙鹏
Owner SHANDONG DONGJIA GRP CO LTD
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