this paper introduces the production principles and methods of high-purity magnesium sulfate,and expounds its application in the aspects of foodt,health care,clinic,veterinary,and chemical reagent,etc.

Distillation separation-IC determination of trace amount of chloride and nitrate in high purity sulfuric acid;

Using pure magnesium desulfuration comes up some problems,such as slag is lack and watery,slag-off is difficult,using air brick help slag-off of molten iron tank is developed,material and installation site of air brick are selected and optimized in the practice,application of air brick is introduced in the paper.

The influence of preparation of raw material,filter medium,mode of crystallization,quantity of aids on production of high purity aluminium ammonium sulfate is studied.

A new technique for preparation of high-purity magnesia from low-grade magnesite was studied.