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X射线物相定量分析,是解决混合物中每种矿物的含量问题,它主要解决化学方法不能解决的一些问题。例如,对于高铝矿物中的红柱石、蓝晶石和矽线石,化学分析是靠Al_2O_3的含量,据据上述矿物的分子式来换算成这些矿物的含量。由于这些矿物均与长石、云母、绿泥石……等铝硅酸盐共生,在溶矿中,这些矿物也都不同程度地被溶解了。因此,所计算出来的矿物量,不是真正高铝矿物的含量。又如,用化学方法确定滑石的含量,是按MgO的含量,据据滑石的分子式计算出滑石的含量。而与滑石共生的矿物有透闪石、透辉石、绿泥石及蛇纹石等。这些矿物也都是镁的硅酸盐矿物。因此,化学分析结果也不能代表滑石的真正含量。
X-ray phase quantitative analysis is to solve the problem of the content of each mineral in the mixture, which mainly solves some problems that the chemical method can not solve. For example, for the andalusite, kyanite and sillimanite in the high-aluminum minerals, the chemical analysis is based on the content of Al 2 O 3 and is converted into the content of these minerals according to the formula of the above-mentioned minerals. Due to the symbiosis of these minerals with aluminosilicates such as feldspar, mica and chlorite, these minerals are also dissolved to varying degrees in the dissolved minerals. Therefore, the calculated amount of mineral is not really high aluminum mineral content. In another example, the chemical method to determine the content of talc is based on the content of MgO, talc according to the formula to calculate the talc content. The minerals that coexist with talc are tremolite, diopside, chlorite and serpentine. These minerals are also magnesium silicate minerals. Therefore, the results of chemical analysis can not represent the true content of talc.