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Silicon-calcium alloy smelting method 2

Weden Metal Co.,Limited | Updated: Jan 22, 2018

Layered feed method of operation can be divided into three stages:

The first stage is warming stage. After tapping, the temperature in the furnace decreases and must be warmed up. The operation is: tapping the discharge electrode after tapping, stoving, removing the lumps, finishing the surface of the material, fixing the material and maintaining the material surface to full load and deep insertion electrode. This phase is generally 1 hour and 20 minutes.

The second stage is CaC2 generation stage. When the furnace temperature is raised, the net floating around the net electrode material, pick open sticky material, quickly add the lime and the corresponding reductant mix, all directly to the electrode around the mandarin vortex. In order to speed up the formation of CaC2, we should try our best to get the full load and fight for the early cover material. This stage of the time is generally 30-40 minutes, can not be too short or too long. Time is too short, CaC2 generation is not sufficient, a large number of CaO did not participate in the reaction with SiO2 after salt reaction; too long, calcium elemental heat and loss of heat increased, the alloy containing Ca decreased, unit power consumption increased.

The third stage is the destruction of CaC2 with silica CaSi alloy phase. When CaC2 is formed, add the mixture, the use of SiO2 in the mixture to destroy CaC2, CaSi alloy. After adding the material, the Jiong burning until baked.

The third stage of the operation should be fed evenly, carefully maintain the furnace condition, increase the material surface permeability, to ensure that the electrode deep and steady into the charge, to prevent the spit fire, in order to reduce the loss of Ca and heat loss. Melting time at this stage is generally 2.5-3 hours.

This stage of the time should not be too long or too short. Too long, Ca volatilization and heat loss increase, the alloy containing Ca is low, the unit power consumption increased; too short, a large number of CaC2 and SiO2 did not fully react, the amount of slag increases, the low calcium alloy, calcium silicate generated less .

Iron and alloy casting, a normal 4-5 hours out of a furnace. When using iron or iron burners to open the tap hole, molten iron and slag into the tundish at the same time. As the slag density is greater than the density of the alloy, the alloy should be sedimented 2-4 minutes in the separator, until the alloy is fully floating, the alloy slowly poured into the ingot mold. When found on the surface of the alloy white, shiny, immediately stop casting, so as to avoid alloy slag. After the condensation of the alloy, stripping, finishing storage.