Thermodynamic study of the effect of calcium on removal of phosphorus from silicon by acid leaching treatment期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Thermodynamic study of the effect of calcium on removal of phosphorus from silicon by acid leaching treatment

Authors:

Tomohito Shimpo Takeshi Yoshikawa Kazuki Morita

Affiliation:

(1) Showa Shell Sekiyu Corporation, 510-0851 Yokkaichi Mie, Japan;(2) Present address: the Department of Materials Engineering, University of Tokyo, 113-8656 Tokyo, Japan

Abstract:

The interaction between calcium and phosphorus in molten silicon was investigated for predicting the removal of phosphorus from silicon by an acid leaching treatment with calcium addition. In the present study, two immiscible liquids of silicon and lead were equilibrated, and the interaction parameter between calcium and phosphorus and the self-interaction parameter of phosphorus in molten silicon at 1723 K were determined.

$varepsilon _{Ca in Si}^P = - 14.6( pm 1.7) varepsilon _{Ca in Si}^P = - 13.8( pm 3.2)$

In the derivation process, the following activity coefficients and the interaction parameters of metallic impurities in molten silicon and lead at 1723 K were also obtained:

$begin{gathered} ln gamma _{Pb in Si}^0 = 3.73( pm 0.010) ln gamma _{Si in Pb}^0 = 3.39( pm 0.040) hfill varepsilon _{Pb in Si}^P = - 4.08( pm 0.80) varepsilon _{Pb in Si}^P = - 23.8( pm 18) hfill varepsilon _{Pb in Si}^{Ca} = - 8.36( pm 1.6) varepsilon _{Si in Pb}^{Ca} = - 14.3( pm 7.0) hfill end{gathered}$

The effect of the calcium addition to silicon improves the subsequent removal of phosphorus in the acid leaching treatment, and the increase in removal fraction of phosphorus was observed remarkably with the addition of calcium in silicon.

Keywords:

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