This paper analyzed the test results of the grinding sintered materials, defined the coarseness of grading, and pointed out, that the average volume size of the particles, determining by laser radiation-diffraction method, can be regarded as the criterion, indicating the grain size of the grinding sintered materials, taking the vacuum-dense alumina ceramics and forsterite ceramics for examples.

The feasibility of producing forsterite refractory with hi-silicon iron ta-ilings and hi-magnesium raw material was discussed,the synthesis reaction process was.

Synthetic forsterites are widely used in many fields because of the super physical and chemical property.

The results show that when heated up to 700℃, the serpentine cat's eye completely dehydrates and partly transforms into crystalline forsterite and non-crystalline enstatite.

The research of the deposit shows that,at the tip of fold structure, where the violent serpentinizaion,phlogopitization,tremolitization and with thick serpentinization for sterite, make for the host of commerical value boron orebody,in addition,the concomitant magnetic anomally should be pay more attention in ore-searching.

Application of Boltonite Sand to Lost Foam Casting;