Purificação de rejeitos de lascas de quartzo das industrias de silicio / Purification of quartz lascas rejected by silicon industries

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Nowadays, Brazil is one of the main silicon metal and iron-silicon producer in the world. But on the other hand, the amount of natural quartz that has been extracted for this purpose is up to 2 milliontons/year. The key-point is the large quantity of rejected quartz lascas, approximately 300,000 tons/year, generated during the various stages of extraction, crushing, selection, transportation, and washing. A new environrnentally mendly purification methodology denominated "quench-Ieaching" and "crush-leaching, that only uses aqueous leaching, has been developed. The result shows an effective elimination of major quartz impurities, such as Al, Fe, Na, K, Ca, Mn, ... , that transforms this rejected material into a 99.9% purity SI O IND 2 . The quality of this material is as high as the quartz powder commercially available in the intemational market for use as "fillers" and translucent silica glass raw material for semiconductor industries

ASSUNTO(S)

environrnentally mendly purification method quartzo - reaproveitamento rejected quartz lascas exhaustion of quartz reserve metal silicon proteção ambiental recursos minerais - conservação quartzo - purificação recycling silicio

ACESSO AO ARTIGO

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