Effects of water hardness on the dispersion of fine coal and kaolinite in coal slurry;

by adding Magnesium Chloride to slurry for improving water hardness,and solving the problem about the lower slurry water hardness causing the increase of concentrating machine overflowed fine slime,long cycle of pressure filtering machine prolonged,increasing input and output material time of filter press,and the slightness of thickener clear aqueous layer.

It was measured that coal slurry concentration、granular fraction distribution、ζ-potential、pH value、water hardness、sludge surface element composition、function group and wetting quality with such characteristic methods as XRD, IR, XPS, pH meter, Electrophoresis analyzer, Spectrophotometer, Contact angle analyzer, Laser particle size analyzer, Ion Chromatography, Nephelometer, and so on.

Influence of Na_2C_2O_4 on hydration and hardening of anhydrite and its action mechanism

The relation of the hydration and hardening process,the hydration production,the dynamics of hydration reaction,the percent conversion of reaction and the microstructure was discussed.

Characteristics of hydration and hardening process and strength properties of class G oilwell cement pastes with and without sand were studied under different temperatures by XRD, SEM, static gel Strength analysis and penetrability test.

By measuring the heat of hydration and the concentration change of phosphate ions during different ages of the cement paste, we study the hydrating and hardening mechanisms of magnesium phosphate cement.