Silicon Carbide/Sic Composition in Minerals & Metallurgy

Silicon carbide for casting is made from quartz sand mixed with petroleum coke or high-quality anthracite through high-temperature reaction. The crystal layer with about 90% SiC content becomes a high-quality silicon source and hot metal purifier in the cast iron process after crushing and sand making and moderate pickling. It is suitable for silicon addition, inoculation, deoxidation and purification in the production process of nodular iron and gray iron.

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Silicon carbide for casting Advantages

★ Prevent the precipitation of carbides and reduce chill tendency.

★ Improve the machinability and mechanical properties significantly.

★ Increase the fluidity, stabilize the composition of molten iron and prevent segregation.

★ Silicon carbide for casting can reduce the sensitivity of wall thickness and make the structure compact,the cutting surface is smooth.

★ Enhance the nucleation ability of graphite and increase graphite core.

★ For nodular cast iron, it is a strong deoxidizer ,it can reduce the amount of nodularizing agent and increase the nodularizing rate.

★ Reduce the cost of molten iron by reducing the rusted scrap and alloy.

★ Eliminate the oxidation factor of molten iron, reduce the oxidation of furnace wall and prolong the life of furnace wall by 30%.

★ Strong deoxidation, purifying molten iron, silicon content is equal to 75% ferrosilicon, but aluminum content is lower.

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Specifications

Type	Product	sic	Particle size	si	c
Sic-01	Sic for casting	88-90%	0-10mm	60-63%	26-27%

Application

The amount of silicon needed to be added in one heat of molten iron is calculated. The amount of silicon that can be absorbed by 1 kg of silicon carbide for casting in molten iron is 0.5-0.56 kg.

According to this calculation, it is easy to calculate the amount of silicon carbide to be added. If the process conditions permit, the hot metal can be absorbed better when it is overheated for 5 minutes at 1550 ℃.

The calculated and weighed silicon carbide is tied up with woven bags, put into the molten iron in the furnace, and the cover material is melted, only after adding the carburizing agent in sequence.

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