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复合熔析精炼去除工业硅中的非金属杂质硼
Authors
孙丽媛
杜冰
+4 more
王志
葛治
陈杭
马文会
Publication date
1 January 2015
Publisher
Abstract
在1550℃下将CaO-SiO_2-Al_2O_3三元渣与Sn-Si合金混合精炼,降温熔析去除工业硅中的杂质B,考察了渣系光学碱度及合金组成对B去除的影响及作用机理. 结果表明,渣系光学碱度增大,BO_(1.5)的活度系数降低明显,增加了B的分配系数,即增强了精炼效果. Sn-Si合金中Sn比例从0增至70%时,B在渣相与合金相间的分配系数从3.16提高至13.8,硅中B含量最低为0.89×10~(-6),最高除硼率为93.3%;当Sn比例大于30%时,合金粘度大幅降低,B的分配系数提高;当Sn比例为70%、合金粘度为0.61 mPa×s时,渣系CaO-SiO_2-20%Al_2O_3与CaO-SiO_2-40%Al_2O_3精炼工业硅所得最大B分配系数分别为10.1和12.3
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Last time updated on 05/12/2019