Improved method of bleaching of metatitanic acid slurry and metatitanic acid

A technology of metatitanic acid and slurry, which is applied in the direction of titanium oxide/hydroxide, etc., can solve the problems of heavy waste water treatment load, influence on chroma, increase of b value, etc., and achieve reduction of sulfuric acid unit consumption, low overall cost, and saving resource effect

Pending Publication Date: 2020-01-14
四川科尔瑞环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) In the prior art, when some titanium dioxide manufacturers use sodium bisulfite formaldehyde alone as a reducing agent, the b value of the kiln product prepared by bleached metatitanic acid slightly increases, and the L value slightly increases. There is a slight increase in the individual b value of the falling or falling kiln products, which affects the chromaticity
[0010] (2) In the prior art, when the trivalent titanium solution is used alone for reduction, the amount of sulfuric acid is large, and the load of wastewater treatment is large

Method used

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  • Improved method of bleaching of metatitanic acid slurry and metatitanic acid
  • Improved method of bleaching of metatitanic acid slurry and metatitanic acid

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Embodiment 1

[0037] An improved method for bleaching metatitanic acid slurry, its specific steps are:

[0038] (1) Take metatitanic acid slurry 40m 3 Add in the reaction vessel, the solid content of the metatitanic acid slurry is 300g / L;

[0039] (2) add trivalent titanium solution 200L and sodium bisulfite formaldehyde 12Kg under stirring and carry out reduction reaction, meanwhile, need to control the mass content of free sulfuric acid in the reduction reaction to be 20g / L; The trivalent titanium added in the reduction reaction The quality of the trivalent titanium in the solution is 0.1% of the total titanium mass in the metatitanic acid slurry, and the addition of the sodium bisulfite formaldehyde is 0.1% of the total titanium mass in the metatitanic acid slurry; the stirring of the reduction reaction The frequency is 40r / min, and the stirring time is 48min;

[0040] (3) The product of the reduction reaction is filtered and washed to obtain bleached metatitanic acid; the washing refe...

Embodiment 2

[0042] An improved method for bleaching metatitanic acid slurry, its specific steps are:

[0043] (1) Take 1200mL of metatitanic acid slurry and add it into the reaction vessel. The solid content in the metatitanic acid slurry is 300g / L; then heat, add 60mL of seed crystals while heating and stir evenly, and control the addition of The solid content of the seed crystal is 100g / L;

[0044] (2) Heating, when the temperature in the reaction vessel is 60°C, add 6 mL of trivalent titanium solution and 0.36 g of sodium bisulfite formaldehyde under stirring to carry out the reduction reaction and keep the temperature in the reaction vessel at 60°C. Control the mass content of free sulfuric acid in the reduction reaction to be 15g / L; The quality of the trivalent titanium in the trivalent titanium solution added in the reduction reaction is 0.1% of the total titanium mass in the metatitanic acid slurry, and the The amount of hydrogen sodium formaldehyde added is 0.1% of the total tita...

Embodiment 3

[0047] An improved method for bleaching metatitanic acid slurry, its specific steps are:

[0048] (1) get metatitanic acid slurry 1200mL and add in the reaction vessel, the solid content in the metatitanic acid slurry is 280g / L;

[0049] (2) Heating, until the temperature in the reaction vessel is 55°C, add 22.4mL of trivalent titanium solution and 1.68g of sodium bisulfite formaldehyde under stirring to carry out the reduction reaction and keep the temperature in the reaction vessel at 60°C, at the same time, It is necessary to control the mass content of free sulfuric acid in the reduction reaction to be 25g / L; the quality of the trivalent titanium in the trivalent titanium solution added in the reduction reaction is 0.4% of the total titanium mass in the metatitanic acid slurry. The amount of sodium bisulfate formaldehyde added is 0.05% of the total titanium mass in the metatitanic acid slurry; the stirring frequency of the reduction reaction is 20r / min, and the stirring ti...

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Abstract

The invention provides an improved method of bleaching of metatitanic acid slurry and metatitanic acid, and relates to the technical field of titanium dioxide production technology. The technical problem existing in several titanium dioxide manufacturers in the prior art that the chromaticity is affected due to the fact that a b value of a kiln falling product is slightly increased, an L value isslightly decreased or only the b value of the kiln falling product is slightly increased, wherein the kiln falling product is prepared by metatitanic acid after bleaching is solved. According to the method, the metatitanic acid slurry is used as a raw material, and a trivalent titanium solution and sodium bisulfite formaldehyde are used as reducing agents to perform a reduction reaction on the metatitanic acid slurry; and then, a product of the reduction reaction is filtered and washed to obtain bleached metatitanic acid. According to the improved method of bleaching of the metatitanic acid slurry and the metatitanic acid, Fe3+ can be effectively reduced to Fe2+, and by filtering, washing and removing, the problems that the chromaticity is affected due to the fact that the b value of the kiln falling product is slightly increased, the L value is slightly decreased or only the b value of the kiln falling product is slightly increased after the titanium dioxide manufacturers use sodium formaldehyde sulfoxylate alone as the reducing agent can be further solved.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production technology, in particular to an improved method for bleaching metatitanic acid slurry and metatitanic acid. Background technique [0002] Domestic production of titanium dioxide mainly uses ilmenite and high-titanium slag as raw materials. The acid hydrolysis of ilmenite in sulfuric acid produces Ti(SO 4 ) 2 , Fe 2 (SO 4 ) 3 and FeSO 4 . The purified acidolysis solution enters the subsequent hydrolysis process, Ti(SO 4 ) 2 It is hydrolyzed to generate metatitanic acid slurry. There is a small amount of iron element remaining in the metatitanic acid slurry entering the bleaching stage, which mainly consists of Fe 3+ and Fe 2+ The ionic state is adsorbed by hydrated titanium dioxide colloidal particles. When the overall or local pH of the system is too high, Fe 3+ May be hydrolyzed to form Fe(OH) 3 Or FeOOH particles. When calcining metatitanic acid, the iron element present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/04
CPCC01G23/04C01P2006/80
Inventor 刘征东周旭
Owner 四川科尔瑞环保科技有限责任公司
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