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硅热还原法比炭热还原法具有一系列的优越性,特别是前者要求温度低,过去尚未将它用于炼制铁合金和含钙的中间合金。碳热还原制取这样的合金会造成碳转入气相(用碳还原钙温度须高达2150℃)。这样高的温度在形成一氧化碳气体的同时,会导致钙蒸气和一氧化硅蒸气从坩埚中猛烈喷出,从而急剧地恶化了劳动条件和冶炼的技术经济指标。熔炼硅钙合金时钙的回收率为65%,硅的回收率为80%。大量的钙和硅从烟尘中损失掉了。
Silicon thermal reduction method has a series of advantages over the carbon thermal reduction method, especially the former requires low temperature and has not been used in the past for refining iron alloy and calcium-containing master alloy. Carbothermal reduction Preparation of such an alloy causes carbon to be transferred to the gas phase (carbon reduction with calcium up to 2150 ° C). Such a high temperature, while forming a carbon monoxide gas, causes violent discharge of calcium vapor and silicon monoxide vapor from the crucible, which drastically deteriorates the working conditions and the technical and economic indicators of smelting. Calcium calcium smelting calcium recovery of 65%, silicon recovery was 80%. Large amounts of calcium and silicon are lost from soot.