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A production method of titanium dioxide

A production method and technology for titanium dioxide, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of excessive waste and by-products, poor quality of titanium dioxide, large gypsum, etc., so as to alleviate the surge in production costs and reduce the overall Cost and effect of saving sulfuric acid consumption

Inactive Publication Date: 2017-06-20
XIANGYANG LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the biggest defect of this method is that there are many wastes and by-products, and the environmental pollution is more serious. Each ton of finished titanium dioxide will discharge 8 tons of waste acid and 3 tons of polyferrous sulfate, and a large amount of sewage; and the titanium dioxide produced The quality of white powder is relatively poor. For example, the Nanjing titanium dioxide factory was shut down due to environmental protection issues.
At present, the dilute waste acid and acid waste water produced in the sulfuric acid process are mostly discharged after being neutralized with lime, but this treatment method will produce a large amount of gypsum, and the gypsum produced is mostly disposed of by dumping or landfilling, causing environmental damage. great damage

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  • A production method of titanium dioxide

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Embodiment 1

[0017] A method for producing titanium dioxide, which is a method for preparing titanium dioxide by a sulfuric acid method, the steps of which include acidolysis of titanium ore, sedimentation, hydrolysis, washing and filtering, rinsing and bleaching, salt treatment and calcining to make powder. It is characterized in that, in the acidolysis section , the ratio of acid to acid ore is 1.61.

Embodiment 2

[0019] A method for producing titanium dioxide, which is a method for preparing titanium dioxide by a sulfuric acid method, the steps of which include acidolysis of titanium ore, sedimentation, hydrolysis, washing and filtering, rinsing and bleaching, salt treatment and calcining to make powder. It is characterized in that, in the acidolysis section , the ratio of acid hydrolysis to acid ore is 1.59.

Embodiment 3

[0021] A method for producing titanium dioxide, which is a method for preparing titanium dioxide by a sulfuric acid method, the steps of which include acidolysis of titanium ore, sedimentation, hydrolysis, washing and filtering, rinsing and bleaching, salt treatment and calcining to make powder. It is characterized in that, in the acidolysis section , the ratio of acid to acid ore is 1.57.

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Abstract

The invention relates to a production method of titanium dioxide, relates to the field of titanium dioxide preparation, and particularly relates to a method of recovering waste acid during titanium dioxide production. The method includes steps of titanium ore acidolysis, deposition, hydrolysis, washing and filtration, rinsing and bleaching, salt treatment and calcination to produce powder. The method is characterized in that the ratio of an acidolysis acid to the ore in the acidolysis step is 1.63-1.57. The method reduces emission of pollutants, and achieves cyclic utilization of waste and waste water, thus achieving an objective of saving energy and increasing the efficiency.

Description

technical field [0001] The invention relates to a production method of titanium dioxide, in particular, the invention relates to a recovery method of waste acid in the production of titanium dioxide. Background technique [0002] Titanium dioxide is a white pigment widely used in coatings, chemical fibers, rubber, enamel, ceramics, plastics, papermaking, printing inks, electronic ceramics, glass, welding rods, cosmetics and other industries. The existing preparation of titanium dioxide has the chloride method and the sulfuric acid method: [0003] The chlorination method is to mix rutile or high-titanium slag powder with coke, and then perform high-temperature chlorination to generate titanium tetrachloride, which is oxidized at high temperature to generate titanium dioxide, and then filtered, washed, dried, and crushed to obtain titanium dioxide products. The process is short, the production capacity is easy to expand, the degree of continuous automation is high, the energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532
Inventor 邓伯松彭本铃徐忠亮
Owner XIANGYANG LOMON TITANIUM IND CO LTD