IMPROVED METHOD FOR THE PREPARATION OF METALLURGICAL GRADE HIGH PURITY SILICON IN PARTICULAR FOR USE IN PHOTOVOLTAIC FIELD

摘要

The present invention relates to a method for producing high purity metallurgic grade silicon, particularly for use in photovoltaic field, said method being characterized in that it provides the steps of: a. selecting high purity raw materials in powder and lump form; b. mixing raw material powder; c. briquetting mixed material; d. realizing batches of briquettes and lump material; e. carrying out carbon reduction within an alternate current (AC) submerged arc furnace (SAF); f. stocking product within SAF furnace basin; g. taking out the product; h. carrying out purification into an inducted ladle; i. settling, skimming and filtering carbide and oxide particles.