In the steel industry, pulverized coal is an important raw material that is widely used in smelting and casting. Pulverized coal is made from coal through a special processing and treatment process, and its particle size is generally more than 200 mesh. Today, we will introduce you to a common application of pulverized coal – pulverized coal for steel mill foundry.
First, the application background of pulverized coal.
In the steel industry, casting fittings is a common production process used to produce parts of various shapes and specifications. The traditional casting method mainly uses sand casting, but this method has some disadvantages, such as long production cycle, high scrap rate, environmental pollution, etc. In order to solve these problems, steel mills began to use pulverized coal as a casting material to replace traditional sand casting.
Second, the characteristics of pulverized coal in steel mills.
Steel mill casting pulverized coal is a special pulverized coal product with the following characteristics:
1.Fine particle size: usually above 200 mesh, it can be better mixed with sand to form a good molding sand.
2.Good cohesiveness: The organic matter in pulverized coal can form a good binder at high temperature, so that the molding sand has good strength and stability.
3.Low cost: Compared with other casting materials, such as silica sand, quartz sand, etc., the high quality of pulverized coal is relatively low, which can reduce production costs.
Third, the application process of pulverized coal.
The application process of pulverized coal in steel mill foundry includes the following steps:
1.Raw material preparation: high-quality coal is selected, and processed by crushing, screening, grinding and other processes to make qualified pulverized coal products.
2.Molding sand preparation: Mix pulverized coal with water to make molding sand, and add an appropriate amount of bentonite and other binders to make the molding sand have good performance.
3.Molding core making: The molding sand is made into a sand mold or core box of the desired shape and size, and then dried and hardened.
4.Smelting and pouring: The molten iron is poured into the sand mold or core box, and after the process of high-temperature smelting and cooling and solidification, the desired casting is formed.
Fourth, the application effect of pulverized coal.
The application effect of pulverized coal in steel mill casting is mainly reflected in the following aspects:
1.Improve production efficiency: Because pulverized coal has better adhesion and stability, it can shorten the time of molding core making and improve production efficiency.
2.Reduce the scrap rate: The strength and stability of pulverized coal sand are better, which can reduce the scrap rate such as deformation and cracking of castings.
3.Reduced environmental pollution: Compared with traditional sand casting, the production process of pulverized coal sand is more environmentally friendly, reducing the emission of exhaust gas, waste water and waste residue.
4.Cost reduction: Due to the relatively low quality of pulverized coal, the use of pulverized coal can reduce production costs and improve the competitiveness of enterprises.
In a word, steel mill casting pulverized coal is an important casting material, which has the advantages of fine particles, good adhesion and low cost. Through reasonable application and production process, it can improve production efficiency, reduce scrap rate, reduce environmental pollution and reduce costs, and make important contributions to the development of the steel industry.