电石渣为钙源的硅热法炼镁煅烧过程

电石渣是化工行业用乙炔法生产乙炔气或聚氯乙烯树脂的工业废渣,其主要成分为Ca(OH)2,是高碱性物质,属于较难处理的工业废弃物.现有处理电石渣的工艺都存在不足之处,因此电石渣的综合利用是近年来研究的重点与热点问题.本文提出以电石渣为钙源的硅热法炼镁工艺,可综合利用电石渣,将其与菱镁石、萤石和硅铁制成预制球团,用于真空热...

Study on calcination process of magnesium smelting by silicothermic reduction with calcium carbide slag as calcium source

Carbide slag is a kind of industrial waste residue produced by acetylene process in chemical industry, and its main component is Ca(OH)2, which belongs to high alkaline substance and is regarded as an unmanageable industrial waste. The existing treatment technologies for calcium carbide slag have shortcomings, hence the research on comprehensive utilization of carbide slag has become a hot point recently. In this paper, the process of magnesium smelting by silicothermic method with carbide slag as calcium source was proposed. Carbide slag, magnesite, fluorite, and ferrosilicon can be mixed to fabricate pellets, and then to produce magnesium by vacuum thermal reduction. It can not only reduce environmental pollution, but also transform waste into valuable resource and generate huge economic benefits. Because the main component of carbide slag is Ca(OH)2, the magnesium smelting pellets using Ca(OH)2 as calcium source were investigated. The effects of calcination temperature and time on the calcination rate and the influence of calcination process on the hydration activity of calcined products were studied. The optimal calcination condition was determined by XRD analysis, which could provide technological parameters and theoretical basis for the subsequent magnesium reduction process with calcium carbide slag as calcium source.