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Sulfuric acid method titanium dioxide waste acid purification process

A technology of titanium white waste acid and sulfuric acid method, which is applied in the direction of iron sulfate, sulfur compounds, sulfur trioxide/sulfuric acid, etc., can solve the problems of expensive equipment, poor effect of crystallization and impurity removal, and increased workload, so as to prolong the use of equipment The effect of life, improvement of heat exchange efficiency, and reduction of the chance of fouling

Inactive Publication Date: 2019-11-12
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process equipment is expensive, the cycle is long, and it is easy to produce uneven cloth during operation, resulting in eccentricity of the drying cylinder, which makes it necessary to continuously debug the centrifuge and increase the workload
At the same time, the process is complex and needs to be pretreated in multiple stages. At the same time, the crystallization temperature is low, and the effect of crystallization and impurity removal is poor, which still cannot solve the problem of more impurities in the waste acid.

Method used

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  • Sulfuric acid method titanium dioxide waste acid purification process
  • Sulfuric acid method titanium dioxide waste acid purification process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 adopts purification process of the present invention to process sulfuric acid process titanium dioxide waste acid

[0049] ①Weigh 60g of titanium dioxide waste acid and 6g of phosphoric acid, stir evenly, and leave the mixed solution at room temperature for 18 hours;

[0050] ② Solid-liquid separation is carried out to obtain the upper clarified solution as primary treatment waste acid, the concentration of sulfuric acid is 36.3% w / w, and the sediment at the bottom of the solution is ferrous phosphate, titanium phosphate and 6.02g of some attachments;

[0051] ③Add 95% ethanol solution to the primary treatment waste acid, the mass ratio of primary treatment waste acid:ethanol is 20:1, stir evenly, and place it at room temperature for 18 hours;

[0052] 4. Carry out solid-liquid separation to obtain the upper clarified solution as secondary waste acid, the concentration of sulfuric acid is 42% w / w, and the precipitate at the bottom of the solution is 5.64 g ...

Embodiment 2

[0055] Embodiment 2 adopts purification process of the present invention to process sulfuric acid process titanium dioxide waste acid

[0056] ①Weigh 60g of titanium white waste acid and 6g of phosphoric acid, stir well, and let the mixed solution stand at a low temperature of -4°C for 12 hours;

[0057] ②Separation of solid and liquid to obtain the upper clarified solution is waste acid for primary treatment, the concentration of sulfuric acid is 74.2% w / w, and the sediment at the bottom of the solution is ferrous phosphate, titanium phosphate and 16.92 g of some attachments;

[0058] ③Add 95% ethanol solution to the primary treatment waste acid, the mass ratio of primary treatment waste acid:ethanol is 20:1, stir evenly, and place it at a low temperature of -4°C for 12 hours;

[0059] 4. Carry out solid-liquid separation to obtain the upper clarified solution as secondary waste acid, the concentration of sulfuric acid is 83%w / w, and the sediment at the bottom of the solution...

Embodiment 3

[0062] Embodiment 3 adopts purification process of the present invention to process sulfuric acid process titanium white waste acid

[0063] ① Weigh 60g of titanium dioxide waste acid and 1.9g of phosphoric acid, stir well, and let the mixed solution stand at room temperature for 18 hours;

[0064] ② Solid-liquid separation is carried out to obtain the upper clarified solution which is waste acid for primary treatment, the concentration of sulfuric acid is 21.32% w / w, and the sediment at the bottom of the solution is ferrous phosphate, titanium phosphate and 4.32 g of some attachments;

[0065] ③Add 95% ethanol solution to the primary treatment waste acid, the mass ratio of primary treatment waste acid:ethanol is 20:1, stir evenly, and place it at room temperature for 18 hours;

[0066] 4. Carry out solid-liquid separation to obtain the upper clarified solution as secondary waste acid, the concentration of sulfuric acid is 28.96% w / w, and the precipitate at the bottom of the s...

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Abstract

The invention relates to a sulfuric acid method titanium dioxide waste acid purification process, belongs to the field of chemical industry waste acid recycling, and provides a sulfuric acid method titanium dioxide waste acid purification process, which comprises: a, adding phosphoric acid to sulfuric acid method titanium dioxide waste acid, stirring uniformly, carrying out solid-liquid separationafter precipitating, and collecting the liquid to obtain first treatment waste acid; and b, adding at least an organic solvent selected from ethanol, acetone, tetrahydrofuran, ethylamine, ethylenediamine, ethylene glycol and glycerin to the first treatment waste acid, stirring uniformly, carrying out solid-liquid separation after precipitating, and collecting the liquid to obtain a purified acid.According to the present invention, with the purification process, only cheap reagents such as phosphoric acid, ethanol and the like are used, and are consumed less, and organic solvents such as ethanol and the like can be recovered so as to achieve recycling, such that the economic cost of waste acid treatment is significantly reduced.

Description

technical field [0001] The invention relates to a purification process of titanium dioxide waste acid from a sulfuric acid process, and belongs to the field of chemical waste acid recycling. Background technique [0002] Titanium dioxide is an excellent white pigment and an important chemical raw material, widely used in coatings, plastics, papermaking, printing, ink, chemical fiber, rubber, cosmetics and other industries. Its chemical formula is TiO 2 , the crystal form has anatase (A-TiO 2 ), and rutile (R-TiO 2 ) Two industrial products. It has stable chemical properties, excellent physical properties (especially high reflectivity, high refractive index, low density), and is non-toxic. [0003] Titanium dioxide is a fine chemical product with the largest output in the titanium industry and is closely related to the national economy. According to statistics from the Titanium Dioxide Center of the National Chemical Industry Productivity Promotion Center, the national ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01G49/14C01B25/37
CPCC01B17/901C01B25/372C01B25/375C01G49/14
Inventor 刘黔蜀张树立文承艳陈书锐张芷瑞李文赵港
Owner PANZHIHUA UNIV
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