2. China's silica market
(1) Development process of Chinese precipitation silica
China's precipitation method silica industry started to develop slowly. In 1958, the first set of precipitation silica industrial plant was completed and put into operation at the Guangzhou People's Chemical Plant, but the production capacity was small. By 1984, there were more than 10 precipitation silica enterprises in the country, with an annual production capacity of 3,500 tons and a production capacity of 2,600 tons. In the 1980s, the rapid development of domestic rubber shoes led to the market demand for silica. After the introduction of the 10,000-ton silica plant introduced in Nanchang in 1989, the annual production capacity of the national precipitation silica in 1990 increased to 30,000 tons. Increased to 20,000 tons.

After a long period of development, China's sedimentary silica industry began to develop rapidly in the 1990s. By 2007, China's precipitation method silica technology has made great progress, and high-concentration sulfuric acid method replaced dilute sulfuric acid method. The entire reaction process was completed in a reactor and the steam indirect heating was replaced by direct steam heating. The development of process technology not only improves thermal efficiency, but also facilitates the use of large reactors and DCS computer control. In addition, the domestic production capacity of silica equipment has also been greatly improved, especially the large-scale reinforced polypropylene box automatic discharge filter press (up to 500m 2 in filtration area) and large-scale spray dryer (the annual production capacity of single unit can be The successful manufacturing of 20,000 tons of equipment has enabled the equipment used in the 10,000-ton production plant to be basically localized, and the construction investment has been significantly reduced. Therefore, the 10,000-ton equipment has developed rapidly, creating a good product quality and reducing raw materials and power consumption. condition. The production cost of ordinary white carbon black by domestic advanced manufacturers has reached the international advanced level. In 2007, there were 49 manufacturers directly involved in the production of precipitated white carbon black (excluding manufacturers who purchased ultra-fine processing or modification of precipitated silica products), with a total production capacity of 839,500 tons and actual output of 643,800. The production capacity and output are the highest in the world. After a period of rapid development, China's sedimentary silica market supply and demand is basically balanced. After 2007, the domestic precipitation method of silica industry as a whole showed capacity increase, competition is fierce, the price is lower, profits decline, industry mergers and acquisitions integration Accelerate, product production to the direction of large-scale development. At the same time, the varieties of silica products in China have developed, and the demand for white carbon black in the tire industry has become a new growth point for the silica industry.