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The news of the first high-level summit on China's saline-alkali economic cooperation held in Shouguang, Shandong, recently released news. In 2009, China's caustic soda production capacity reached 27.93 million tons, and its output was 18.91 million tons. At the same time, due to the impact of the international financial crisis, the chemical industry has been affected by a large impact since October 2008 and the operating rate has dropped. The demand for caustic soda has decreased. In addition, caustic soda production is also affected by the chlorine balance product polyvinyl chloride. In addition to maintaining a certain growth in profile and pipe materials, the growth rate of other downstream industries of PVC has obviously slowed down, and the contradiction between oversupply and supply has become prominent. Due to the poor sales of PVC, each chlor-alkali plant reduced its production and the production load decreased, which increased the cost of caustic soda.
Sufficient caustic soda production capacity and sluggish market resulted in under-exploitation of existing caustic soda companies. Some operating rates were less than 50%, and some had even been discontinued; the imbalance between chlor-alkali development was serious and the caustic soda production capacity surplus was very severe. In the second half of this year, although the domestic caustic soda market has recovered, this is due to policy reasons and the large amount of production restrictions, production suspensions, and recent raw material price increases in the previous period. It is not the overall market recovery.
Obviously, relieving domestic excess production of caustic soda is a problem that needs to be solved urgently. Inorganic silicon compounds are the basic raw materials for many industries, especially the chemical industry. They have many varieties and a wide range of applications. The sodium metasilicate series product is an inorganic silicon compound that consumes a large amount of caustic soda. In recent years, the use and dosage of sodium metasilicate products have been increasing year by year. They have been widely used in household and industrial detergents such as non-phosphorus builders, wool detergents, fabric treatment agents, paper deinking agents, and oilfield oil recovery auxiliaries. Especially in the rolling industry, it is extremely effective for the surface cleaning of metal cold rolled plates. At present, anhydrous sodium metasilicate used in metal surface cleaners in Western countries accounts for 60% of the total local production. With the development of the market, the application of sodium metasilicate has become more widespread.
The production of sodium silicate products is divided into two steps: First, a certain concentration of caustic soda and quartz sand are chemically reacted in a certain proportion, and the soluble silicate produced by the liquid phase method is used to produce sodium silicate; Granulation, cooling and other processes made of sodium metasilicate series products. Granulation of anhydrous sodium metasilicate is considered to be the highest end product in the silicon partial series. The production of anhydrous sodium metasilicate per ton of granulate requires consumption of 45 tons of caustic soda by 46%. The production of pentahydrate sodium metasilicate consumes 46% of caustic soda. 0.8 tons.
It is understood that Qingdao Haijing Chemical Group is an old company that produces caustic soda, with an annual output of 100,000 tons of ion-exchange membrane caustic soda, which is a large producer of caustic soda in Shandong Province. The company has faced the situation of overcapacity in caustic soda production in the domestic market and has introduced 10,000-ton granulation sodium metasilicate series products. At present, this high-value-added silicon chemical product project is about to be put into production. It can not only consume excess caustic soda, but also extend the industrial chain of the company's products and increase the added value of caustic soda. The project was first introduced from overseas by the Qingdao Paohuali Soda Plant and has now grown to tens of thousands of tons of production. In recent years, the plant's sodium metasilicate products are in short supply and sales have reached a record high.
Due to the limitation of the process technology, only the production of sodium metasilicate series and layered sodium silicate can adopt the process of using caustic soda as a raw material. In 2009, the production of sodium metasilicate in China was 250,000 tons, accounting for 30% of the world's total output. The 2010 Inorganic Silicon Compound Industry Annual Conference held in September this year formulated the “Twelfth Five-Year Plan†for inorganic silicon compounds and proposed to vigorously develop silicon chemical industry, in which sodium metasilicate is to be developed to 500,000 tons/year. In addition, it is planned to intensify the R&D and production of high-mold phase liquid silicon chemical industry. This will not only produce other caustic sodas with excess capacity, but also significantly reduce energy consumption, and promote caustic soda while saving energy and reducing emissions while reducing costs. Healthy development of the industry.
In recent years, the output of caustic soda in China has increased substantially, while the traditional downstream demand for caustic soda has been insufficient. The issue of overcapacity and weak market needs to be solved urgently. Industry experts suggest that as a major consumer of caustic soda, the development of high value-added, high-alkali-consuming products in the field of inorganic silicon compounds will be one of the effective ways to solve the excess production capacity of caustic soda.