This paper introduces the technology characteristics of cristobalite produced by direct calcination with nubby quartz.
闡述了石英塊料直接煅燒法生產(chǎn)加工方石英的工藝特點(diǎn).
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However, the biosilica obtained by the dry ashing method from rice shells directly is cristobalite silica.
而利用干灰化法從稻殼中直接提取的硅質(zhì)體是方晶石型的SiO2材料.
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