A study of the purification of metallurgical grade silicon
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2020, Journal of Alloys and CompoundsCitation Excerpt :In addition, in order to further separate new impurity phases formed by the addition of getter elements, hydrometallurgy or field intensive separation methods were often carried out. For example, the acid leaching process was commonly used to remove inter-grain impurities and collect the refined Si [5,22,23], while the enormous acid consumption was a persistent problem mainly for the removal of alloy agent. Many efforts were made to achieve the in-situ-separation of Si crystals, impurities and alloy melt by adopting some physical field like super gravity [24,25], thermal gradient [26,27] and electromagnetic field [13,28,29].
Copyright © 1986 Published by Elsevier B.V.