There are two methods for producing titanium dioxide, sulfuric acid and chlorination.
The sulfuric acid method is an acid hydrolysis reaction of ilmenite powder with concentrated sulfur to form titanium chloride sulfate, which is formed by the formation of metatitanic acid by water, and then calcined and pulverized to obtain a titanium white powder product, which can produce anatase type and rutile type titanium. White powder.
Advantages: low price and easy availability, mature technology, simple equipment, easy to solve anti-corrosion materials; Disadvantages: long process, only intermittent operation, wet operation, and a large amount of sewage.
The chlorination method is to mix rutile high-titanium slag powder with coke and then chlorinate at a high temperature to form titanium tetrachloride, which is oxidized by high temperature to form titanium dioxide, and then filtered, washed, dried and pulverized to obtain a finished titanium dioxide powder.
Chlorination can only produce rutile products. Advantages: short process, easy to expand production capacity, high degree of continuous automation, and low energy consumption. "Three wastes" are few, and you can get quality products. Disadvantages: large investment, complex equipment structure and high material requirements.
As is known, the chlorination process has many advantages over the sulfuric acid process and is the mainstream process of the titanium dioxide industry in developed countries. In 2017, except for China, the chlorination capacity accounted for 60.1%, and the chlorination capacity of the top five companies accounted for 65.3%.
However, in China, the chlorination method is another scene: China's total titanium dioxide production capacity reached 1.8 million tons per year in 2009, ranking first in the world, but the market share of domestic chlorinated titanium dioxide products is small. can be ignored. In 2011, the output of chlorination products accounted for 1.35%, 1.27% in 2012, 1.11% in 2013, 1.78% in 2014, 3.5% in 2015, 4.1% in 2016, and 5.8% in 2017.
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