Titanium Dioxide Production Process Technology--Overview (1)
Since the discovery of titanium in 1791 to the commercial production of titanium dioxide by the sulfuric acid method in 1918, it has been more than 80 years of production and commercial use history. The titanium dioxide production methods mainly include sulfuric acid and chlorination.
Is sulfuric acid or acid-soluble titanium ore slag is reacted with sulfuric acid solution to give the titanyl sulfate solution, by hydrolysis of metatitanic acid precipitate; and then into the rotary kiln calcined output Ti0 2. The sulfuric acid process is mainly operated by a batch process, and the production device has large elasticity, which is favorable for opening parking and load adjustment. However, the process is complicated and requires nearly twenty process steps. Each process step must be strictly controlled to produce the best quality titanium dioxide product and meet the optimal performance of the pigment. Sulfuric acid method can produce anatase products, but also the production of rutile product.
The chlorination method uses titanium-containing raw materials, reacts with chlorine gas such as chlorinated high-titanium slag or artificial rutile or natural rutile to form titanium tetrachloride, which is purified by rectification and then subjected to gas phase oxidation; after rapid cooling, the gas is passed through solid separation to give Ti0 2. The Ti0 2 by the adsorption of a certain amount of chlorine, the need for heat or steam treatment to remove it. The process is simple, but must at 1 000 ℃ or higher chlorination conditions, there are many chemical engineering problems such as chlorine, chlorine oxide, highly corrosive titanium tetrachloride to be solved, plus special raw materials used, compared The sulfuric acid process is costly. The production of chlorination process is continuous production. The flexibility of the operation of the production equipment is not large. The opening and stopping of the production and the production load are not easy to adjust, but the continuous process production, the process is simple, the process control point is small, and the product quality is easy to achieve optimal control. In addition, there is no sintering formed by the rotary kiln calcination process, and the Ti0 2 primary particles are easily depolymerized, so it is apparently considered that the quality of the chlorinated titanium dioxide product is superior.
The advantages and disadvantages of sulfuric acid method and chlorination method are shown in the table.
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