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

摘要

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.