The paper stated the research achievements and development status of coal preparation,hydraulic coal mining,slurry pipeline transportation,coal mining under the buildings,railway line and rivers,mine reclamation and environmental protection technologies.

Long-distance,high-lift and high-concentration slurry pipeline transportation is a suitable transportation method in China.

Diameter optimal design of slurry transportation pipeline;

This paper introduces that the high-lift slurry pump of isolat(water-isolate slurry pump) which was remade has been used in the large grain slurry transportation system,and gives reference to other kinds of high-lift slurry pump.

A kind of check valve suitable for the system of large grain slurry transportation is introduced.

According to the geometry relations of steel pipe and the roller at the steel pipe transportation,we established the mathematical model of roller curved surface,using the vector analysis method,and inferred the concave curved surface equation of concave roller,which provided the theory basis for calculated the forced parameters and the optimized design to concave roller.