礱糠是食米加工中的主要附产品,研究它的组成对於它的利用不无意义。礱糠约百分之五的重量为灰分,而灰分中二氧化硅的含量可达百分之九十几,其中大部分为无定形态,也有少量以结晶状态存在着。有资料认为这种少量二氧化硅,主要是鳞石英和白硅石,而石英的晶体即有也很少。本文系用x光粉末法,对灰中晶态二氧化硅所作定性和定量分析的研究报告。 Rice bran is the main product of rice processing, its composition is not meaningful for its use. Approximately 5% by weight of the chaff is ash, while the content of silica in the ashes reaches up to 90%, most of which are in the amorphous state, and a small amount exists in the crystalline state. There is information that this small amount of silica, mainly tridymite and white silica, and quartz crystal, there are few. In this paper, the use of x-ray powder method, the gray crystalline silica made qualitative and quantitative analysis of the research report.