Surface characters of anhydrite powder modified by titanate coupling agent,effects of the anhydride powder before and after modification on mechanical properties of PVC compounds and the conjoint state of PVC compounds with modified or unmodified anhydrite powder were studied.

Activation and modification of natural anhydrite;

Preliminary study on manufacture of anhydrite from phosphogypsum;

Process and development prospect of co-production of sulphuric acid and cement with anhydrite;

Characters near strong impact loading zone in hard rock;

Aiming at the problem of poor blasting effects that exists universally in hard rockst,he middle deep hole blasting tests were done in hard rock tunnels at Shuangyang Mine;and the blasting test results of different kinds of cutting forms have been gotten.

This paper expounds the Application of presplit controlled blasting technique in the hard rock blast,and introduces the general situation of the engineering,the design scope,the drill-and-blast technical parameters,the structure of charging and explosive load,the blasting network,and the firing order,etc.

Study on application of rock hardness prediction with logging data;