Purified quartz and process for purifying quartz
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United States of America Patent
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Aug 6, 1991
Issued Date -
N/A
app pub date -
Oct 17, 1990
filing date -
Feb 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Quartz is purified by removing mineral impurities, particularly alkali metal impurities, from within the quartz crystal lattice structure. According to the disclosed process, quartz crystals are subjected to a pretreatment that removes surface bound impurities and then contacted with gaseous HCl at a temperature of from 800.degree. C. to 1600.degree. C. for a period of time of from a few minutes to several hours, thereby diffusing the mineral impurities to the quartz crystal surface where they form salts with chloride ion, removing the salts, and recovering the purified quartz crystals.
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