STUDY ON PREPARATION AND GEL PERFORMANCE OF HIGH PURITY MONTMORILLONITE

摘要

In order to research the colloidal and thixotropic performance of the inorganic gel prepared by highpurity montmorillonite, this study uses the moderate grade bentonite ores from Weifang (China) as rawmaterial. Two-stage hydrocyclone classification was applied to obtain the high purity montmorillonitewith its content of 94.8 per cent. In contrast to other methods of montmorillonite purification, twostagepurification by hydroclone has the advantages of larger throughput and easily achieving autocontrolin industry, and purified products with different montmorillonite content can be obtained bythis method. And then the inorganic gel was prepared by the prepared high purity montmorilloniteand its colloidal and thixotropic performances by measuring the flowability and thixotropy werefurther studies. Research results show that the inorganic gel has plastic body liquidity, the viscositydecreases with the increase of the shear rate, the static and dynamic shearing stress values are33.98 Pa and 91.89 Pa, respectively, and the thixotropic value is 95.2 dyne·s/cm2, which indicates thatit has preferable colloidal and thixotropic performance. Montmorillonite inorganic gel prepared bybentonite with high montmorillonite content and low-layer charge has better gel performance.