Phosphogypsum is regarded as a resource,a product;by analysis on the impurity characteristics of phosphogypsum,the effect of further utilization is discussed and pre-treatment process is determined,as a basal step to resource treatment on the phosphogypsum.

The basic methods of the pre-treatment of CVD diamond film substrates such as cemented carbide substrates,copper,steel,silicon etc.

Investigation of pretreatment process with zinc-plating for magnesium alloy electroplating;

The concept and principle of pretreatment process was described, a series advantages brought by the pretreatment process to the production of the ductile iron casting was introduced: Increasing the nodule counts, improving the nodularity and improving the capacity of anti-degenerating, decreasing the addition amount of the nodularizer , reducing the shrinkage defects and so on .

The gold resources in China and present status of pretreatment process of various refractory gold ores are reviewed.

In order to excess the advance technology of soybean oil processing in the world,oil plant should pay attention to the design of soybean processing line,especially the pretreatment technique of soybean oil extraction,according to the structure and characteristic of soybean.

Study on pretreatment technology of refractory gold ore and its application status;

To carry through technology alteration for the imported Galfan coating production line from such aspects as take-up and pay-off,pre-treatment process,heating mode of zinc pot,rub and cooling system.