Process of industrialize for waste acid concentrition recovering used in titanium white production by sulfuric acid method

A technology of titanium dioxide and sulfuric acid method, which is applied in the direction of sulfur trioxide/sulfuric acid, titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of easy scaling and blockage of equipment and pipelines, waste of valuable resources, unstable operation, etc., and achieve Overcoming the problems of equipment corrosion and crystallization pipe plugging, saving external steam consumption, improving efficiency and economy

Active Publication Date: 2006-01-25
潜江方圆钛白有限公司
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AI Technical Summary

Problems solved by technology

[0004] At present, sulfuric acid method or chlorination method is used in the world to produce titanium dioxide. The sulfuric acid method has the advantages of sufficient raw material sources and low production costs. h 2 SO 4 Calculated, the same below), every ton of titanium dioxide produced produces about 4 to 5 tons of waste acid, if the waste acid is not recycled, it will cause a lot of waste of precious resources, and improper disposal will cause serious harm to the environment
The use of neutralization treatment not only consumes a large amount of alkali (lime, carbide slag), but also produces a large amount of industrial sludge (industrial gypsum), and the operating cost is huge, which is unbearable for enterprises
[0005] After searching, it was found that the invention patent application with the publication number CN1608716A discloses a "recovery method for waste sulfuric acid and waste gas produced in the production process of titanium dioxide", which is concentrated by the generated rotary kiln flue gas (gas-liquid), three-stage steam Concentration, three-stage series crystallization kettle concentration, silicon carbide evaporator and other multi-stage (up to 7 stages) concentrated waste acid concentration reaches 80-90%, and also extracts the titanium dioxide entrained in the waste acid. This recovery method exists as follows Disadvantages: (1) Large steam consumption, high power consumption, and high operating costs
(2) Concentration efficiency is low, the concentration of waste acid can only reach 80-90% after 7-stage concentration, the operation is unstable, and the waste acid with a concentration of 80-90% is not the most suitable for reuse in the production process of titanium dioxide. The acid concentration can be reused at 55-65%
(3) There are many operating equipment, complex structure and high investment
(4) The operation of the equipment is complicated and the maintenance is difficult
(5) The process design is complex, and it is not easy to combine with the titanium dioxide production process and promote each other
(6) Equipment and pipelines are prone to fouling and blockage, etc.

Method used

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  • Process of industrialize for waste acid concentrition recovering used in titanium white production by sulfuric acid method
  • Process of industrialize for waste acid concentrition recovering used in titanium white production by sulfuric acid method
  • Process of industrialize for waste acid concentrition recovering used in titanium white production by sulfuric acid method

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Experimental program
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Effect test

Embodiment 1

[0053] 1) Preheat about 20% of the waste acid produced in the first washing process of sulfuric acid titanium dioxide production through preheater 2-7 and pass it into the circulation pool 2-1, and at the same time pass it into the calcination process of sulfuric acid titanium dioxide production The generated rotary kiln flue gas is passed into the circulation pool 2-1 through the spray tower 2-2, and the residual steam generated in the preheater 2-7 is passed into the condenser 2-9, and the condenser 2-9 is cooled by tap water, and the heat The water is removed from the secondary washing process in the production of sulfuric acid titanium dioxide; the condensed water is discharged to the sewage station for neutralization through the pouring tank 2-10, and the uncondensed steam (gas) is connected to the vacuum pump to be emptied.

[0054] The waste acid is circulated and concentrated between the circulation pool 2-1 and the spray tower 2-2 to about 28-30%, and the tail gas in t...

Embodiment 2

[0057] 1) Preheat about 20% of the waste acid produced in the first washing process of sulfuric acid titanium dioxide production through preheater 2-7 and pass it into the circulation pool 2-1, and at the same time pass it into the calcination process of sulfuric acid titanium dioxide production The generated rotary kiln flue gas is passed into the circulation pool 2-1 through the spray tower 2-2, and the residual steam generated in the preheater 2-7 is passed into the condenser 2-9, and the condenser 2-9 is cooled by tap water, and the heat The first water washing process in the production of titanium dioxide by the sulfuric acid method; the condensed water is discharged to the sewage station for neutralization through the pouring tank 2-10, and the uncondensed steam (gas) is connected to the vacuum pump to be emptied.

[0058] The waste acid is circulated and concentrated to about 28-30% between the circulation pool 2-1 and the spray tower 2-2, and the tail gas in the circula...

Embodiment 3

[0061] 1) Preheat about 20% of the waste acid produced in the primary water washing process of sulfuric acid titanium dioxide production through preheater 2-7 and pass it into the circulation pool 2-1, and at the same time pass it into the calcination process of sulfuric acid titanium dioxide production The generated rotary kiln flue gas is passed into the circulation pool 2-1 through the spray tower 2-2, and the residual steam generated in the preheater 2-7 is passed into the condenser 2-9, and the condenser 2-9 is cooled by tap water, and the heat The secondary water washing process in the production of titanium dioxide by the sulfuric acid method; the condensed water is discharged through the pouring tank 2-10 to the sewage station for neutralization treatment, and the uncondensed steam (gas) is connected to the vacuum pump to be emptied.

[0062] The waste acid is circulated and concentrated between the circulation pool 2-1 and the spray tower 2-2 to about 28-30%, and the t...

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Abstract

An industrial process for reclaiming the waste acid in the production of titanium white powder by sulfuric acid method features that the waste acid is concentrated by fume and then by steam. Its advantages are high efficiency, low cost, and no environmental pollution.

Description

technical field [0001] The invention relates to an industrialized technology for concentrating, recovering and reusing waste acid produced in the production of titanium dioxide by sulfuric acid method, more specifically, it is an industrialized method for concentrating and reusing waste acid in the production of titanium dioxide by sulfuric acid method. 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, decolorization power, covering Strength, opacity and chalking resistance, it is one of the whitest pigments found in the world. It is widely used in coatings, plastics, papermaking, chemical fiber, ink, rubber, medicine, food and cosmetics industries, and has a wide rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01G23/053
Inventor 毛明周晓东胡宗烈魏光磊黄娟李峙蒋绘兰程志刚高彦华徐国强
Owner 潜江方圆钛白有限公司
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