PROCESS FOR PRODUCING SOLAR BATTERY FROM WASTE SALT AND SAND IN DESERT

WIPO Patent Application WO/2010/089803

A1

Disclosed is a process for producing a solar battery that uses a waste salt, which is produced in a large quantity in a desert area, and sand in a desert as raw materials to produce solar-grade silicon. The process for producing a solar battery from a waste salt and sand in a desert comprises an electrolysis step of electrolyzing NaCl as a waste salt after the separation of fresh water from seawater to give Na and obtaining NaOH from Na, a sol-gel step of reacting NaOH with sand in a desert to give Na2SiO3, reacting Na2SiO3 with HCl to give H2SiO3, and firing H2SiO3 to enhance the purity of SiO2, a carbon reduction step of reducing SiO2 concentrated in the sol-gel step with C to give high-purity metal silicon, a metallurgical step of applying electron beams to the metal silicon in vacuo to remove impurities by evaporation and further performing oxidation to remove impurities to obtain solar-grade silicon, and a solar battery production step of producing a solar battery from the solar-grade silicon.

SUZUKI FUMIO (JP)
TAKAHASHI ITSUPEI (JP)
SASAKI KOJI (JP)

PCT/JP2009/000489

August 12, 2010

February 06, 2009

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ABEL SYSTEMS INC (JP)
SUZUKI FUMIO (JP)
TAKAHASHI ITSUPEI (JP)
SASAKI KOJI (JP)

H01L31/04; C01B33/02

JP2005162504A	2005-06-23
JP2005187302A	2005-07-14
JP2006150147A	2006-06-15
JP2008038673A	2008-02-21
JPH10182133A	1998-07-07
JP2008260676A	2008-10-30
JP2005504695A	2005-02-17

HIDEOMI KOINUMA: "1. Kessho Silicon-kei: Solar Silicon no Kakushinteki Seizo Process no Kaihatsu", NIMS NOW, vol. 8, no. 11, November 2008 (2008-11-01), pages 3

TOYOSU, Yasuhiro et al. (JP)
Yasuhiro Toyosu (JP)

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