Characteristics of chlorination titanium white process
Sulfuric paint grade titanium white to go through five steps: preparing ore; Preparation of titanium sulfate; preparing hydrated Ti0 2; calcination of hydrated Ti0 2; post-treated titanium dioxide. Including the following steps: drying, magnetic separation and scrub, acid hydrolysis, purification, concentration, seed and hydrolysis, water washing, bleaching and bleaching, salt treatment, calcination, post-treatment, waste by-product recovery, treatment and utilization. The disadvantages are long and complicated process, discontinuous production process, large equipment, low production capacity and low automation. Therefore, the product quality is not as good as the chlorination method.
The biggest features of the chlorination process are as follows.
1 The process is short. High-grade titanium feed iron ore, natural rutile front, synthetic rutile or titanium-rich material into the plant process requirements have good processing; # 1 after forging desired focus chloride, may be required according to the process into the plant, even It is also very easy to process the block into the factory to achieve the required particle size. The raw material processing preparation process is omitted. The chlorination, refining and oxidation processes are simple and continuous, and the production is not stopped, so that the process flow is short.
2 The device is small, the reaction speed is fast, and the production capacity is large. The main equipment is continuously operated, and the production flexibility of the device is small, and it is impossible to store and stay in the middle.
3 Each relevant process requires high reliability, high degree of automation, and is difficult to master. Because the whole process is carried out in pressurized, high temperature and strong corrosive media, the adjustment control needs to be very fast and precise to ensure the safe operation of the system. All process power and raw materials must be continuously uninterrupted. In addition to the general plant's power, steam, industrial water, there are special requirements of the air separation device, chlorine supply device, desalinated water supply device, etc. must have 100% reliability to ensure the good state of the entire system. Otherwise, if a fault occurs in one place, it will cause full-line parking. For this reason, the main process must be fully controlled and automated.
4 product quality is good. The purity of the raw materials is high, and in particular, the ability of titanium tetrachloride to refine vanadium and iron is incapable of the sulfuric acid method. The parameters of the oxidation system can be adjusted, so the semi-finished product of the chlorination method has fine particle size, uniformity, narrow distribution and good whiteness, which lays a good foundation for the final product.
The process characteristics of sulfuric acid and chlorination are shown in the table below.
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