Method for removing iron from low-concentration industrial titanium liquid and method for preparing high-purity titanium dioxide

A technology for industrial titanium liquid and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, titanium compound, etc., can solve the problems of affecting the purity of titanium dioxide, increasing the adsorption and carry-out of impurity ions, and the adverse effects of hydrolysis, so as to achieve impurity removal. Remarkable effect, simple process and high removal rate

Active Publication Date: 2022-07-29
PANZHIHUA UNIV
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  • Abstract
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Problems solved by technology

[0003] However, because the titanium liquid used in the sulfuric acid process is obtained by acidolysis and purification of titanium concentrate or titanium slag, the low-concentration dilute titanium liquid is obtained after concentration, and the dilute titanium liquid contains a large amount of impurities such as ferrous ions, which will cause Subsequent processes are adsorbed and mixed in metatitanic acid, which ultimately affects the purity of titanium dioxide products
Moreover, the removal efficiency of iron and other impurity ions is not high by the traditional freezing iron removal process, and the titanium liquid also contains some solid impurity particles, which will cause adverse effects on subsequent hydrolysis, increase the adsorption and carry-out of impurity ions, and then affect the titanium dioxide. the purity of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using 2000mL of low-concentration industrial titanium solution with a total titanium concentration of 135.2g / L and a Fe content of 51.7g / L as the raw material, 31.6mg of citric acid was added to the titanium solution, and after dissolving, stirring and mixing, 18.4mg of amine was added. The methylated polyacrylamide was redissolved, stirred and mixed, and then frozen and crystallized to remove impurities. The freezing temperature was 5°C and the freezing time was 20 minutes. After freezing, disperse diatomite with water on the filter paper and then spread it, and the dosage is 0.5kg / m2 according to the filter area. 2 The total titanium concentration of the obtained titanium solution after impurity removal was 123.7g / L, the Fe content was 8.16g / L, and the iron removal rate was (51.7-8.16) / 51.7=84.2%.

Embodiment 2

[0032] Using 2000mL of low-concentration industrial titanium solution with a total titanium concentration of 151.4g / L and a Fe content of 64.7g / L as the raw material, 45.2mg of citric acid was added to the titanium solution, and after dissolving, stirring and mixing, 26.0mg of amine was added. The methylated polyacrylamide was redissolved, stirred and mixed, and then frozen and crystallized to remove impurities. The freezing temperature was 2°C, and the freezing time was 35 minutes. After freezing, disperse diatomite with water on the filter paper, and then spread it, and the dosage is 0.6kg / m2 according to the filter area. 2 The total titanium concentration of the obtained titanium solution after impurity removal was 140.5g / L, the Fe content was 8.97g / L, and the iron removal rate was (64.7-8.97) / 64.7=86.1%.

Embodiment 3

[0034] Using 2000mL of low-concentration industrial titanium solution with a total titanium concentration of 123.8g / L and a Fe content of 34.2g / L as raw material, 26.8mg of citric acid was added to the titanium solution, and after dissolving, stirring and mixing, 16.2mg of amine was added. The methylated polyacrylamide was redissolved, stirred and mixed, and then frozen and crystallized to remove impurities. The freezing temperature was 8°C and the freezing time was 25 minutes. After freezing, disperse diatomite with water on the filter paper and then spread it, and the dosage is 0.7kg / m2 according to the filter area. 2 The total titanium concentration of the obtained titanium solution after impurity removal was 116.4g / L, the Fe content was 9.28g / L, and the iron removal rate was (34.2-9.28) / 34.2=72.9%.

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Abstract

The invention relates to a method for removing iron from low-concentration industrial titanium liquid, and belongs to the field of titanium dioxide preparation. The method specifically comprises the following steps: adding citric acid into a low-concentration industrial titanium solution, uniformly stirring to obtain a purified solution 1, adding aminomethylated polyacrylamide into the purified solution 1, uniformly stirring to obtain a purified solution 2, freezing and crystallizing the purified solution 2 at 0-10 DEG C, and filtering to obtain the purified solution which can be used for preparing high-purity titanium dioxide. According to the method, the removal rate of impurity ferrous ions in the low-concentration industrial titanium liquid is high, high-purity titanium dioxide can be prepared after the titanium liquid is subjected to the procedures of hydrolysis, washing, calcination and the like, and the method can be used in the application field of electronic titanium dioxide and the like.

Description

technical field [0001] The invention relates to a method for removing iron from low-concentration industrial titanium liquid, and belongs to the field of titanium dioxide preparation. Background technique [0002] High purity TiO 2 The market demand is increasing year by year, and it has become the basic raw material for the preparation of titanium-containing high-performance materials. Titanium dioxide and titanium metal have a wide range of applications, especially in many high-tech fields, the impurity content of titanium dioxide is extremely strict, especially in the fields of liquid crystal materials, precision sensors and aerospace, aerospace coatings and other fields. 2 Purity and other requirements are higher. The sulfuric acid method has the advantages of simple and mature process, easy availability of raw materials, low production cost, and simple equipment. 2 cheapest method. [0003] However, because the titanium liquid used in the sulfuric acid method is obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G23/053
CPCC01G23/008C01G23/0532
Inventor 田从学
Owner PANZHIHUA UNIV
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