In this paper,we devised a precise temperature regulating open furnace to describe and analyze the regularity and control of fluoride emission from coal-clay briquette combustion in open ground-stove,the effect of retention period and combustion temperature on fluorine emission and the relationship of fluorine retention with dosage of CaCO_3 and combustion temperature have been obta.

In this study the slime filter cake that is derived from wet preparation process is crushed quanlititively to regulate the size and dried out moisture content at first stage.

Analysis on capability and behavior reason of slag MTC solidifying cake.;

The laboratary resrearch results show that cakes can cause the unsolided interbed between oilwell cement rock and stratum, and greatly decreasing.

The influence of mud cake on permeability determination using full acoustic waveform.;

The drilling resistance of the Erkaijing well in oil field of north Shanxi is caused by hydration expansion of mud stone and mud cake deposition of porous sandstone.

A great deal of analyse are conductedon the foam mud cake in its micro-structure,reveal-ing the foam mud cake is characterized with viscoelas-ticity and water dispersion,The caving prevention andwall protection mechanism of the foam mud is demon-strated.

Preliminary analysis on refracted slide wave of mudcake in sonic logging;

The permeability, porosity and thickness of mudcakes formed under dynamic filtration were studied with HTHP dynamic flowmeter.