By deeper analysis to rotary screen from such aspects as classification efficiency,abrasion,assignment and structure,the methods to improve the rotary screen are put forward.

Analysed the existed problems during the operation of rotary screen,a nd a dopted appropriate improving measures,the stability of its operation was v ery well improved.

Through technical research,a simple structure of the coal slurry rotary screen has been successfully applied to solve the actual operation problems of the project.

New Route of developing Qinghai mirabilite resources;

Study and Analysis of the Method on Removal of Mg and Ca from Mirabilite in the Yuncheng Salt Lake;

Now exploitation condition and plan to be developed for mirabilite in Huaian;

Comparison of determination method of sulfate radical in Glauber salt production;

The phase diagram of potassium sulfate production from glauber salt and potassium chloride was studied and analysed, and experimental optimum factor and level are obtained.

Novel process for manufacturing soda ash and sulfuric acid from sodium sulfate;

Several processes for the purification of anhydrous sodium sulfate from the raw material in Yuncheng are introduced.

Taking the precipitated barium sulfate produced by sodium sulfate-barium sulfide method as a sample,there are three kinds of the product,i.