Several methods for preparing spherical silica powder are presented and analyzed.

Separation of clinochlore from powder quartz by reverse flotation and its mechanism;

Study on modification results of modified powder quartz by using several different coupling agent;

High purity spherical-normal spherical submicron crystal silica is prepared by using technique of mixing acid corrosion(anhydrofluoric acid and sulphuric acid) and method of mechanical stir from raw powder quartz.

The chemical composition,mineral composition,whiteness,particle size and morphology characteristic of natural fine quartz in Guiding county,Guizhou province,were studied in this paper.

Study on Processing Technology for Konilite of Guiding,Guizhou;

Taking konilite and carbon white as siliceous material,xonotlite samples were synthesized by a dynamic hydrothermal method,with bulk density of 123 kg/m3 and 374 kg/m3 respectively.

The decomposition ratio can be improved from 92% to ≥99% by the adoption of precipitation conversion theory and proper addition of quartz powder as conversion agent without heating throughout the process.

The effect of additives on synthesis of xonotlite fiber with nano diameter is studied using industrial lime and quartz powder,selecting calcium chloride,strontium nitrate,zirconium oxychloride as additives.

Using fly ash or quartz powder with similar fineness as active or inert mineral admixture,the influence of type and adding percentage of mineral admixtures on compressive strength development of complex binders was investigated under the conditions of different water binder ratios and different curing schedules.