工业硅生产过程的热力学分析与优化

Thermodynamic Analysis and Optimization on the Production Process of Industrial Silicon

为了优化现有矿热炉碳热还原炼硅工艺,提高工业硅的产出量,利用热力学软件HSC,基于平衡常数法,对二氧化硅碳热还原制取工业硅的反应过程进行了热力学计算,并用HSC软件的化学反应平衡模块模拟分析了在煅烧的石英石和碳质还原剂中添加碳化硅对反应的影响。通过软件模拟,分析加入SiC作为原始物料后,不同物料配比对硅产出率的影响。结果表明:在煅烧的石英石和碳质还原剂中添加适量碳化硅可以促进反应的进行,以SiO2、SiC、C为炉料,当输入摩尔比为m(SiO2/C/SiC)=3∶1∶2时,硅产出量相对最高。

In order to optimize the existing process of silicon smelting based on technology of carbothermic reduction and increase the output of industrial silicon, the calculation of preparation reaction of industrial silicon is carried out by a software called HSC which is based on the technology of earbothermic reduction and the principle of equilibrium constant. The effect of adding SiC in the calcination reaction of quartzite and carbon is investigated by the equilibrium constant module of HSC. And the impact of the ration of added SiC on the silicon output is investigated. The result shows that the production reaction of silicon can be enhanced when appropriate amount of SiC is added into reductor prepared by calcination reaction of quartzite and carbon. When SiO2, SiC and C are picked up as furnace chargers and the mole ration of Si02/C/SiC is 3： 1： 2, the maximum output can be reached.