Green and environment-friendly sulfuric acid method titanium dioxide production device and process

A kind of green environmental protection, production process technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., to achieve the effect of improving the recovery rate of titanium dioxide, reducing emissions, and reducing environmental pressure

Inactive Publication Date: 2015-06-10
SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

[0003] Many manufacturers have carried out technical transformation of the process to reduce the loss of titanium dioxide, reduce the loss of waste acid, and reduce the use of water. Although the effect is remarkable, the problem of loss has not been solved from the source, so the improvement of the process still has potential to be tapped

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  • Green and environment-friendly sulfuric acid method titanium dioxide production device and process
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  • Green and environment-friendly sulfuric acid method titanium dioxide production device and process

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Embodiment 1

[0070] The concentration of titanium in the waste acid after one wash is 9.22g / L, the concentration of ferrous ion is 45g / L, and the content of sulfuric acid is 20%. The waste acid is firstly treated by a microfiltration membrane with a precision of 200nm and a transmembrane pressure difference of 0.2MPa. After the membrane treatment, the concentrated solution containing metatitanic acid is returned to the first washing tank, and the titanium concentration in the clear solution after the membrane treatment is 2g / L. The supernatant liquid treated by the microfiltration membrane continues to be treated with an acid-resistant membrane, and the operating pressure is 3.8MPa. After acid-resistant membrane treatment, the concentrated solution containing ferrous sulfate and titanyl sulfate is returned to the acid hydrolysis pot. The concentration of titanium in the clear solution after single-stage acid-resistant membrane treatment is 140mg / L, the concentration of ferrous ion is 2.25g...

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Abstract

The invention relates to a green and environment-friendly sulfuric acid method titanium dioxide production device and process. The process comprises the following production procedures from the upstream side to the downstream side in sequence: grinding, acid hydrolysis, clarification, vacuum crystallization, disc filtration, fine filtration, vacuum concentration, titanium liquid preheating, hydrolysis, primary washing and chip loading, pulping, primary washing, bleaching, secondary washing, plate-frame pressure filtration, salt treatment and vacuum drum dehydration, calcination, Raymond grinding, pulping and dispersing, sanding, film coating, tertiary washing, drying, air jet pulverization and packaging. The process provided by the invention can not only be used for improving the titanium dioxide recovery rate to create economic benefits for sulfuric acid method titanium dioxide enterprises, but also can be used for reducing the emission of waste acid and waste water to reduce the environmental pressure and create environmental benefits for the society, so that the process is a green and environment-friendly new process.

Description

technical field [0001] The invention relates to the field of environmental protection technology, in particular to a device suitable for the sulfuric acid process titanium dioxide industry, which can simultaneously improve the recovery rate of titanium dioxide, improve the recycling rate of sulfuric acid, and improve the recycling rate of washing water, with less investment, low energy consumption, and oil removal. Sulfur removal can be carried out at the same time, and the green environmental protection sulfuric acid method titanium dioxide production device and process with high stripping efficiency. Background technique [0002] At present, the yield of titanium dioxide in the sulfuric acid method titanium dioxide industry is 87-88%. The main losses come from the hydrolysis section, washing section, calcination section, and packaging section. The losses are: 4-5%, 2-3%, 1- 2%, 1-2%. The loss in the washing section mainly comes from the titanyl sulfate dissolved in the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 杨积志李海波张俊邵宋邵吴科
Owner SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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