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Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron

A technology of ascorbic acid and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of titanium dioxide whiteness and gloss quality decline, large sewage discharge, high iron impurity content, etc., and achieve iron impurity washing and removal High efficiency, reduced water consumption, and simple operation

Inactive Publication Date: 2012-12-12
SHANDONG DONGJIA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a sulfuric acid washing process for producing titanium dioxide by using ascorbic acid to remove high-valent iron, which solves the problem of high iron impurity content in titanium dioxide after washing, the decrease in the whiteness and gloss of the produced titanium dioxide, and the amount of sewage discharge big problem

Method used

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  • Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron
  • Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron
  • Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron

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Effect test

Embodiment 1

[0032] Put 200g of metatitanic acid sample in a beaker, put TiO 2 The concentration is controlled at 260±5g·L -1 , the temperature was kept within the range of 45±2°C, and ascorbic acid (concentration of TiO 2 concentration of 0.3%), adjust the stirring speed at 1500r min -1 , the reaction lasted for 30 minutes. After the reaction was balanced, it was washed with distilled water heated to 50°C, and then the filter cake was dried, dehydrated and desulfurized, and the color index was measured by the iron content measured by the fluorescence analyzer and the dry powder whiteness meter. The results are shown in Table 2.

Embodiment 2

[0034] Put 200g of metatitanic acid sample in a beaker, put TiO 2 The concentration is controlled at 300±5g·L -1 , the temperature was kept within the range of 45±2°C, and ascorbic acid (concentration of TiO 2 concentration of 0.4%), adjust the stirring speed at 1200r·min -1 , the reaction lasted for 50 minutes. After the reaction was balanced, it was washed with distilled water heated to 50°C, and then the filter cake was dried, dehydrated and desulfurized, and the color index was measured by the iron content measured by the fluorescence analyzer and the dry powder whiteness meter. The results are shown in Table 2.

Embodiment 3

[0036] Put 200g of metatitanic acid sample in a beaker, put TiO 2 The concentration is controlled at 340±5g·L -1 , the temperature was kept within the range of 45±2°C, and ascorbic acid (concentration of TiO 2 concentration of 0.5%), adjust the stirring speed at 1600r min -1 , the reaction lasted for 40 minutes. After the reaction was balanced, it was washed with distilled water heated to 50°C, and then the filter cake was dried, dehydrated and desulfurized, and the color index was measured by the iron content measured by the fluorescence analyzer and the dry powder whiteness meter. The results are shown in Table 2.

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Abstract

The invention belongs to the field of titanium dioxide production and specifically relates to a water washing process for producing titanium dioxide by using a sulfuric acid method which uses ascorbic acid to remove high-valence iron. According to the process, during the process that the ascorbic acid is used for reducing the titanium dioxide, trace amounts of the high-valence iron in metatitanic acid are obtained after first water washing and then subjected to second water washing during the production of the titanium dioxide. According to the water washing process, processes for removing high-valence iron when the titanium dioxide is produced by using sulfuric acid methods are improved, one procedure is used for replacing two procedures of traditional processes, and simultaneously, water consumption for a secondary water washing procedure is greatly reduced due to the fact that a sulfuric acid bleaching procedure is omitted. According to the water washing process for producing the titanium dioxide by using the sulfuric acid method which uses the ascorbic acid to remove the high-valence iron, costs are reduced, discharging quantities of waste acid and waste water are reduced, and the problem that aluminum content in a product is high in titanium dioxide due to the fact that trivalent titanium is used for reduction is successfully solved. The water washing process is wide in process condition requirements, simple in operation, high in efficiencies of washing and removing the iron impurity and good in development prospects and application and popularization values.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a water-washing process for producing titanium dioxide by using ascorbic acid to remove high-valent iron. Background technique [0002] Titanium dioxide (commonly known as titanium dioxide) is considered to be a white pigment with the best performance in the world. The physical and chemical properties of titanium dioxide are very stable, and it does not react with most substances under normal circumstances. Compared with other white pigments, it has superior whiteness, tinting power, hiding power, weather resistance and heat resistance, especially non-toxic. Widely used in coatings, plastics, rubber, ink, paper, chemical fiber, ceramics, daily chemicals, medicine, food and other industries and fields. [0003] At present, the industrial mature production processes of titanium dioxide include sulfuric acid method and chlorination method. The production proc...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 李化全姜丽孙鹏
Owner SHANDONG DONGJIA GRP CO LTD
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