The smelting method and function of silicon-calcium alloy

Calcium silicon alloy is made by smelting ferrosilicon and some calcium-containing ore at high temperature in an electric furnace. Lime is commonly used for calcium-containing ore. The smelting of silicon-calcium alloy is the same as silicon-barium smelting. There are two processes. The first One is a one-step smelting method, through which coke, silica, steel shavings and lime are smelted at a high temperature in an electric furnace to obtain the desired silicon-calcium alloy; the second is a two-step smelting method, which produces high-carbon ferrosilicon in an electric furnace, Then use high-carbon ferrosilicon and lime to get the desired silicon-calcium alloy. The calcium content of the silicon-calcium alloy smelted by the two-step method is about 20%, while the calcium content commonly used in China is 28%-30%, so we usually use it in China. one-step smelting method.

The role of silicon-calcium alloy is used as a deoxidizer and desulfurizer in steelmaking, generally used in out-of-furnace refining. Calcium has a high affinity at high temperature, and calcium can also purify molten steel. Improve the fluidity of molten steel, the deoxidized product cao is easy to float and discharge, the calcium element in the steel can change the properties of the steel, so that the plasticity and toughness of the refined steel are improved. Permanent deformation, on the contrary, when an external force is applied to the steel, the steel will be denatured. After the force is removed, the steel will return to its original shape. This is called elasticity. Heat, so it is also used as a warming agent in the converter workshop, silicon-calcium alloy can also be used as an inoculant for cast iron and an additive in the production of ductile iron. Now, it can be made into alloy powder and rolled into steel strip to make silicon-calcium cored wire.

There are many kinds of Chinese standards for silicon-calcium alloys, but the commonly used indicators are 2855 and 3060. In addition to indicators, the price of silicon-calcium alloys is also affected by particle size and packaging. The particle size is also divided into powder, granules and standard blocks. Naturally Several kinds of blocks. The packaging is also divided into tons of packaging and small bags, which all affect its price. In terms of production costs, silicon-calcium alloys are also raw material costs, electricity costs, and labor costs, as well as post-processing loss management costs. Electricity costs account for the largest proportion.



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