Less pollution inorganic casting binder is widely used

At present, organic binders are widely used in the casting industry, with many advantages, such as large production output, low energy consumption, high casting surface quality and dimensional accuracy, fast mold change speed, convenient flexible production, etc. However, organic binders have prominent disadvantages, such as heavy environmental pollution, high production cost, less pollution, high quality The extensive use of low-cost inorganic binder is a trend in foundry production.

Water glass binder has many advantages, such as non combustion, high temperature resistance, rich resources, low cost, no precipitation of various toxic gases and condensates, no pollution to the working environment and casting tooling and so on. Sodium silicate sand not only has good working environment, but also improves casting quality and reduces production cost. It is valued and favored by foundry workers. It is considered to be the molding sand most likely to realize green casting in the 21st century. German ha chemical company and ask chemical company have developed the new modified sodium silicate sand process of cordis series and inootec series respectively, and domestic Huazhong University of science and technology fan Zitian and others have successfully developed the new modified sodium silicate, which has been applied to batch casting production, and achieved satisfactory results in environment, quality and economy, It opens up a new way for the application of water glass inorganic binder in high efficiency, complex and high quality casting production. Therefore, a large number of casting applications of water glass inorganic binder have great social and economic value for reducing the pollution of casting industry and realizing green casting. The application and development prospect of water glass inorganic binder in casting production is very broad.

In recent years, researchers at home and abroad have carried out research on the application of water-soluble animal protein binder in foundry production, and the application of animal binder has been reported abroad. Water soluble animal protein has the advantages of non toxicity, high strength, rich raw materials and low cost. The development of the application of water-soluble animal protein binder in casting production will help to reduce the casting production cost and improve the economic benefits of enterprises. At present, domestic water-soluble animal protein as casting binder has not been put into the market, mainly in laboratory research.

In short, with the increase of casting output in China year by year, the extensive use of less polluting inorganic binder will effectively reduce the environmental pollution brought by the casting industry, which has great social and economic value, and has great theoretical and practical significance for the realization of green casting.

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