Preparation of Pure and Impurity-Stabilized Polymorphs of Silica in the Minus Five Micron Particle Size Range by Non-Comminution Techniques.

摘要

At the present time the quantitative analysis of silica is of considerable importance to a number of governmental and industrial laboratories. The Mining and Safety Research Center of the U.S. Bureau of Mines is especially interested in this problem area because of their current activity in respirable dust analysis. The problem of analyzing silica in a composite dust sample is particularly difficult because of the large number of different forms that commonly exist in nature. In the present research,an attempt was made to prepare in the pure state those silica phases that are ordinarily observed in minerals. Some 60samples of assorted dusts were prepared,including quartz,cristobalite, tridymite,kaolinite,calcite,muscovite,illite,montmorillonite, Ba3(PO4)2,and YPO4. Several samples were prepared to include iron,manganese,and titanium impurities. These samples can be used to check analytical techniques being developed for field dust samples.