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Method for sulfate process titanium dioxide salt treatment through wet process phosphoric acid

A wet-process phosphoric acid and salt treatment technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of large product content, inability to produce titanium dioxide, and inability to directly use sulfuric acid method for titanium dioxide salt treatment process, etc. The effect of broadening the application and reducing the production cost

Active Publication Date: 2017-06-13
SICHUAN LOMON TITANIUM IND CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

However, the quality of wet-process phosphoric acid is low, and often contains impurities such as iron, aluminum, magnesium, calcium, and sulfate. Typical wet-process phosphoric acid components are: P 2 o 5 =246g / l; Al 2 o 3 =; MgO = 13.36g / l; CaO = 3.22g / l; Fe = 6.39g / l; SO 4 2- =60g / l, because the impurity content in the wet-process phosphoric acid is extremely high, it cannot be directly used in the salt treatment process of the existing sulfuric acid process titanium dioxide (adding wet-process phosphoric acid directly to the second-washed metatitanic acid slurry as a phosphorus source salt treatment agent will cause The product contains a lot of impurities, and it is impossible to produce qualified titanium dioxide)

Method used

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  • Method for sulfate process titanium dioxide salt treatment through wet process phosphoric acid

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Experimental program
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Effect test

Embodiment 1

[0032] 1, get the thick metatitanic acid slurry 1000ml that obtains by hydrolyzing titanyl sulfate solution (wherein TiO 2 =160g / l), add 1.6ml of wet-process phosphoric acid (wherein P 2 o 5 =200g / l), mixed slurry is carried out solid-liquid separation after mixing evenly, obtains a filter cake;

[0033] 2. Wash the filter cake once with water to remove the iron ions in it, and measure the Fe / TiO in the filter cake base after washing 2 =2428ppm, obtain a wash metatitanic acid cake;

[0034] 3. After washing the metatitanic acid cake, add water and beat until TiO 2 =300g / l, then add 98 acid, trivalent titanium to the slurry, and add calcined seeds to adjust the H in the mixed slurry 2 SO 4 = 40g / l, Ti 3+ = 0.1g / l, calcined seed crystal = 2.5%, then keep the temperature at 60°C for 60 minutes, and then perform solid-liquid separation on the bleached slurry to obtain a secondary filter cake;

[0035] 4. Wash the filter cake twice with water to remove the iron ions in it, a...

Embodiment 2

[0038] 1, get the thick metatitanic acid slurry 1000ml that obtains by hydrolyzing titanyl sulfate solution (wherein TiO 2 =160g / l), add 2.0ml wet-process phosphoric acid (wherein P 2o 5 =200g / l), mixed slurry is carried out solid-liquid separation after mixing evenly, obtains a filter cake;

[0039] 2. Wash the filter cake once with water to remove the iron ions in it, and measure the Fe / TiO in the filter cake base after washing 2 =2943ppm, obtain a wash metatitanic acid cake;

[0040] 3. After washing the metatitanic acid cake, add water and beat until TiO 2 =346g / l, then add 98 acid, trivalent titanium to the slurry, and add calcined seeds to adjust the H in the mixed slurry 2 SO 4 =42g / l, Ti 3+ = 0.24g / l, calcined seed crystal = 1.5%, then keep the temperature at 60°C for 60min, and then perform solid-liquid separation on the bleached slurry to obtain a secondary filter cake;

[0041] 4. Wash the filter cake twice with water to remove the iron ions in it, and measur...

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Abstract

The invention relates to a sulfate process titanium dioxide production technology and particularly discloses a method for sulfate process titanium dioxide salt treatment through wet process phosphoric acid. The wet process phosphoric acid as a salt treatment agent for providing a phosphorus source in a salt treatment process is achieved through adding the wet process phosphoric acid to coarse metatitanic acid slurry obtained through hydrolysis of a titanyl sulfate solution. The method has the advantages that (1) sulfate process titanium dioxide salt treatment through low-quality wet process phosphoric acid is achieved and the production cost of sulfate process titanium dioxide is reduced; (2) the application of the wet process phosphoric acid is expanded.

Description

technical field [0001] The invention relates to a production process of titanium dioxide, in particular to a production process of sulfuric acid process titanium dioxide. Background technique [0002] Since the discovery of titanium in 1791 and the commercial production of titanium dioxide by the sulfuric acid method in 1918, there have been more than 80 years of production and commercial use history. The production processes of titanium dioxide mainly include sulfuric acid method and chlorination method. The main domestic process is the sulfuric acid method, and its typical production process can be summarized as follows: [0003] (1) carry out acidolysis reaction with titanium concentrate or acid-soluble titanium slag and sulfuric acid, obtain titanyl sulfate solution; [0004] (2) hydrolyzing titanyl sulfate solution to obtain thick metatitanic acid slurry; [0005] (3) washing and salting the thick metatitanic acid slurry to obtain pretreated metatitanic acid; [0006...

Claims

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Application Information

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IPC IPC(8): C01G23/00C01G23/053
CPCC01G23/00C01G23/0532
Inventor 代堂军姚恒平朱全芳孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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