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A method for reducing the amount of waste acid in the production of titanium dioxide

A technology of titanium dioxide and acid content, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of waste of acid resources, large solid waste, and high energy consumption.

Active Publication Date: 2017-09-26
XIANGYANG LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are high energy consumption and high processing costs
The calcium carbide slag neutralization method uses calcium hydroxide slag and other wastes mainly containing calcium hydroxide and waste acid to carry out acid-base neutralization, and then precipitates for mud-water separation. The main disadvantage of this method is that it produces a large amount of solid waste and wastes acid resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 84%.

[0022] Grind 1000kg of qualified titanium concentrate, 325 mesh sieve residue is less than 30%, add 620kg of 55% sulfuric acid and mix evenly, then add 1280kg of 98% sulfuric acid to initiate the main reaction, the initiation temperature is greater than 150°C, and the solid phase is at 200°C Aging for 30 minutes, adding 3000L water for leaching for 30 minutes, adding iron powder to reduce until the trivalent titanium disappears, and obtaining a qualified acid-liberation material titanium solution A, and testing related indicators, 55% of sulfuric acid is prepared from waste acid and concentrated sulfuric acid.

Embodiment 2

[0024] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 84%.

[0025] Grind 1000kg of qualified titanium concentrate, and the residue on 325 mesh sieve is less than 30%, add 1090kg of 55% sulfuric acid and mix evenly, add 660kg of SO 3 , to initiate the main reaction, the initiation temperature is greater than 150°C, the solid phase is matured at 200°C for 30 minutes, added 3000L water for leaching for 30 minutes, added iron powder to reduce until the trivalent titanium disappears, and the qualified acid-release material titanium liquid B is obtained, and the test is related Indicators, 55% of sulfuric acid is configured from waste acid and concentrated sulfuric acid.

Embodiment 3

[0027] Acid hydrolysis conditions: acid to mineral ratio 1.60, initial reaction acid concentration 75%.

[0028] Grind 1000kg of qualified titanium concentrate, and the residue on 325 mesh sieve is less than 30%, add 1700kg of 55% sulfuric acid and mix evenly, add 370kg of SO 3 , to initiate the main reaction, the initiation temperature is greater than 150°C, the solid phase is matured at 200°C for 30 minutes, added 3000L water for leaching for 30 minutes, added iron powder to reduce until the trivalent titanium disappears, and obtains qualified acid-release material titanium solution C, which is detected Indicators, 55% of sulfuric acid is configured from waste acid and concentrated sulfuric acid.

[0029] Table 1 is the reaction parameter of each embodiment

[0030] serial number

[0031] Experimental data show that: the invented process can not only increase the recycling amount of waste acid, reduce the generation amount of waste acid, but will not affect the qu...

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PUM

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Abstract

The invention discloses a method for decreasing the waste acid content in titanium dioxide production. Sulfur trioxide and 55% sulfuric acid are adopted to be premixed with titanium concentrate for an acidolysis reaction in the rutile-type titanium dioxide production process through a sulfuric acid method, and then the method for decreasing the waste acid content in titanium dioxide production is achieved.

Description

technical field [0001] The invention relates to a method for reducing the amount of waste acid in the production process of titanium dioxide, in particular to the acid hydrolysis process in the production of sulfuric acid rutile titanium dioxide, which uses sulfur trioxide and 55% sulfuric acid to premix titanium concentrate, and then achieves A method for reducing the amount of waste acid in the production of titanium dioxide. Background technique [0002] Titanium dioxide, also known as titanium dioxide, scientific name titanium dioxide (TiO 2 ), white powder, non-toxic and harmless, is an important inorganic chemical raw material, its chemical properties are very stable, it has excellent physical properties, optical properties and pigment properties, and has excellent whiteness, refractive index, color reduction power , hiding power, opacity and chalking resistance, it is one of the whitest pigments found in the world at present, and is widely used in coatings, inks, pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 钟晓英代堂军范先国周晓葵朱全芳
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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