THE APPLICATION OF GREY THEORY TO THE STUDY OF THE COMPONENTS OF BENTONITE
Wen Shu-yao · Acta Mineralogica Sinica · 2003
Regular changes took place in the components of Heishan bentonite after sulphuric acid solutions of different concentrations (0,5%, 10%, 15%, 20%, 25%, 30%) acted on the sample. Eleven components of bentonite and acidation bentonite have been studied with the grey theory: the eleven components have been simplified as 4 compositions according to their similar properties; (1) Si4+, Na+ , K+ and Ti4+ are hard to dissolve; (2) the higher the acid concentration, the more Fe3+ , Al3+ and Mg2+ will be dissolved; (3) the contents of Mn2+ and P in bentonite are very low, and they are partly dissolved at low acid concentration, but no more dissolved at higher concentration; (4) Ca2+ is totally dissolved at low concentration. This behavior is related to the chemical properties of positive ions mentioned above and their planar position. This information is used to forecast the variation of the components in different environments.