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;

The manufacture technology of complex wall material from wheat straw and hard plasterboard was researched.

Diagenesis of anhedritite in the Cretaceous reservoir and its influence on the hydrocarbon distribution in southeast Jianghan Basin;

The structures and properties of gypsum and anhedritite are introduced in this paper.

The effect of water/powder ratio on accuracy and hardness of die stone models;

Investigation and classification in the amount of die stone of work model on denture restoration;

Aim: To evaluate the surface hardness and abrasion resistance of die stone model with the application of a new gypsum surface hardener.