PENGARUH WAKTU PELINDIAN PADA PROSES PEMURNIAN SILIKON TINGKAT METALURGI MENGGUNAKAN LARUTAN HCl

Abstract

EFFECT OF LEACHING TIME ON PURIFICATION PROCESS OF METALLURGICAL GRADE SILICON BY USING ACID SOLUTION. The purification process of metallurgical grade silicon (MG-Si) using acid leaching method at a concentration of 2.45 mol/L HCl was performed by varying the leaching time at boiling temperature ( ±100 °C) and with mechanical stirring. The results showed that the leaching process of MG-Si with HCl can be used to eliminate the element of metal impurities. The extraction efficiency of impurity elements contained in the MG-Si by HCl dissolution is 99.996 % for Al, 98.247 % for Ti and 98.491 % for Fe at leaching time of 120 hours. Whereas the leaching efficiency of HCl solution on the impurities using mechanical stirring is 99.04 %.