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Method for reducing washing water in production process of titanium dioxide

A production process, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of a large amount of solid waste calcium sulfate, pollute the environment, increase production costs, etc., achieve major environmental protection and economic benefits, and reduce sewage discharge , Guarantee the effect of iron removal effect

Inactive Publication Date: 2017-11-07
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will produce a large amount of solid waste calcium sulfate, which will pollute the environment
The treatment of acid wastewater will also increase the production cost of enterprises

Method used

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  • Method for reducing washing water in production process of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Fe in metatitanic acid before second washing 2+ / TiO 2 =1030ppm. Second washing filter press feed 3t (with TiO 2 count), after the end of feeding, start the second wash. In the first 30 minutes, the electric valve of the secondary washing water supply pump is used to adjust the washing water flow rate to 21m 3 / h; after washing for 30 minutes, adjust the valve opening of the water supply pump and adjust the washing water flow rate to 6 m 3 / h, the duration is 120min. The entire washing process controls the washing water pressure to 0.36mpa through the outlet pipe.

Embodiment 2

[0019] Fe in metatitanic acid before second washing 2+ / TiO 2 =800ppm. Second washing filter press feed 3t (with TiO 2 count), after the end of feeding, start the second wash. In the first 50 minutes, the electric valve of the secondary washing water supply pump is used to adjust the washing water flow rate to 15m 3 / h; after washing for 50 minutes, adjust the valve opening of the water supply pump and adjust the washing water flow rate to 5m 3 / h, the duration is 120min. The entire washing process controls the washing water pressure to 0.35mpa through the outlet pipe.

Embodiment 3

[0021] Fe in metatitanic acid before second washing 2+ / TiO 2 =700ppm. Second washing filter press feed 3t (with TiO 2 count), after the end of feeding, start the second washing. In the first 40 minutes, the electric valve of the secondary washing water supply pump is used to adjust the washing water flow rate to 18m 3 / h; after washing for 40 minutes, adjust the valve opening of the water supply pump and adjust the washing water flow rate to 6 m 3 / h, the duration is 120min. The entire washing process controls the washing water pressure to 0.4mpa through the outlet pipe.

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Abstract

Inventor of Sichuan Longmang: The present invention relates to a method for reducing washing water in the production process of titanium dioxide, including a secondary washing step of metatitanic acid. Water washing is carried out with a small flow of desalted water. In the second washing step of metatitanic acid, by controlling the flow rate of desalted water in stages, the method can not only effectively reduce the amount of washing water, but also ensure the iron removal effect.

Description

technical field [0001] The invention relates to a method for reducing washing water in the production process of titanium dioxide, belonging to the technical field of titanium dioxide production. Background technique [0002] At present, the production of titanium dioxide in my country is mainly based on the sulfuric acid method. After the titanium liquid is hydrolyzed, white metatitanic acid precipitates are obtained, which contains a large amount of impurities such as ferrous sulfate. The presence of impurity iron will affect the brightness and whiteness of titanium dioxide products. In the industry, ferrous sulfate is generally soluble in water, and the metatitanic acid is washed with a filter press to achieve the purpose of iron removal. Iron removal with metatitanic acid is divided into three steps: first washing, bleaching, and second washing. [0003] During the first washing process of metatitanic acid, the acidity gradually decreases, and the ferric ions will be h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 沈亮杨万梅代堂军姚恒平孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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