Calcium and titanium as impurity getter metals in purification of silicon
Calcium and titanium as impurity getter metals in purification of silicon
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DOI：
10.1016/j.seppur.2013.01.028
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
M. Johnston;M. Barati
中科院分区：
文献类型：
--
作者：
M. Johnston;M. Barati
本文介绍了溶剂精制实验的结果，主要是对硅中的硼和磷的脱除。将钙或钛与冶金级硅熔化，形成合金相，杂质元素被排除在合金相中。然后对熔体进行缓慢冷却，使固体硅从混合物中分离出来。将固化的样品粉碎，释放出合金相，然后在酸中浸出，以便收集提纯的硅产品。加入钛后，再用盐酸、硝酸和硫酸的混合物浸出，但对脱除B或P没有效果，只是用吸气剂金属污染了硅。钙的加入对磷的去除是非常有效的，当加入4wt.%的钙时，磷的去除几乎完全。
In this paper, the results of solvent refining experiments are described with primary focus on the removal of boron and phosphorus from silicon. Either calcium or titanium was melted with metallurgical grade silicon to form an alloy phase into which impurity elements are rejected. The melt was then slow cooled to allow solid Si to separate from the mixture. The solidified sample was crushed to liberate the alloy phase before leaching in acid to allow the purified silicon product to be collected. Titanium additions were followed by leaching with a mixture of hydrochloric, nitric and sulphuric acids, but were not effective for removing B or P, serving only to contaminate the Si with the getter metal. Adding calcium was very effective for removing phosphorus when leached in two stages, with near complete removal achieved with 4wt.% addition of Ca.