Removal of iron and titanium in poly-crystalline silicon by acid leaching

被引：24

作者：

Sakata, T ^{[1
]}

Miki, T

Morita, K

机构：

[1] Univ Tokyo, Fac Engn, Dept Met, Tokyo 1138656, Japan

[2] Univ Tokyo, Grad Sch Engn, Dept Met, Tokyo 1138656, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2002年 / 66卷 / 05期

关键词：

silicon; calcium; iron; titanium; phase diagram; phase equilibrium; segregation coefficient; solidification; grain boundary; acid leaching; aqua regia;

D O I：

10.2320/jinstmet1952.66.5_459

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Removal of Fe and Ti from Si by acid leaching method was examined, the optimum condition for acid leaching was obtained and the mechanism of removal of impurities in Si was estimated. Si-Ca-(Fe, Ti) alloys with various compositions were subjected to acid leaching procedure using aqua regia. For most of the samples, 85-96% of Fe and 80-93% of Ti were removed from Si and the effects of cooling rate and alloy composition were studied. Slow cooling (4.4 K/min) was found to be better for effective removal of impurities than quenching. In order to give a higher removal rate of iron, acid soluble CaSi2 phase should be precipitated as a secondary phase, namely X-Ca/X-Fe > 6.5. On the other hand, the optimum composition for the removal of Ti is considered to be X-Ca/X-Ti = 3.

引用

页码：459 / 465

页数：7

共 10 条

[1] PARTIAL-PURIFICATION OF METALLURGICAL SILICON BY ACID-EXTRACTION [J].

CHU, TL ;

CHU, SS .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1983, 130 (02) :455-457

[2] IMPURITY EFFECTS IN SILICON FOR HIGH-EFFICIENCY SOLAR-CELLS [J].

HOPKINS, RH ;

ROHATGI, A .

JOURNAL OF CRYSTAL GROWTH, 1986, 75 (01) :67-79

[3]

Kato Y, 2000, TETSU TO HAGANE, V86, P717

[4] SPECTROSCOPIC CHARACTERIZATION OF POLYSILICON SOLAR-CELLS [J].

MANAMOHANAN, SB ;

GARG, RK ;

PARTHASARATHI, S ;

PRADHAN, MM .

BULLETIN OF MATERIALS SCIENCE, 1995, 18 (02) :103-106

[5] REFINING OF FE-SI ALLOYS BY ACID LEACHING [J].

MARGARIDO, F ;

MARTINS, JP ;

FIGUEIREDO, MO ;

BASTOS, MH .

HYDROMETALLURGY, 1993, 32 (01) :1-8

[6] Thermodynamic properties of titanium and iron in molten silicon [J].

Miki, T ;

Morita, K ;

Sano, N .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 1997, 28 (05) :861-867

[7]

Miki T., 1999, J MASS SPECTROM SOC, V47, P72, DOI [10.5702/massspec.47.72, DOI 10.5702/MASSSPEC.47.72]

[8]

OTOTANI T, 1969, SCI REP RES TOHOKU A, V21, P69

[9]

Rohatgi A., 1980, Fourteenth IEEE Photovoltaic Specialists Conference 1980, P908

[10] MELTING EQUILIBRIA IN SYSTEM IRON-SILICON-CALCIUM [J].

SCHURMANN, E ;

LITTERSCHEIDT, H ;

FUNDERS, P .

ARCHIV FUR DAS EISENHUTTENWESEN, 1975, 46 (07) :427-432

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