Based on comparison made among various methods for calculation of free settling velocity of coarse coal slime,the formula catering for calculation of free settling velocity of coarse coal slime has been derived.

The paper describes the performance of novel water-only cyclone and results from test conducted on single conic section water-only cyclone with larger conic angle and new type of water-only cyclone with newly improved conic section structure for treating coarse coal slime.

The paper describes the process of coarse coal slime separation and the flow direction of coarse coal slime.

The improvement and optimization of coarse slime recovery process in coal preparation plant;

The research of coarse slime recovery of flotation system in Cheji Coal Preparation Plant

By means of the tests of compressive strength, toxicity characteristic leaching procedure(TCLP) and dynamic leaching test(DLT), it was studied that the feasibility of solidification and stabilization (S/S) of heavy metals using reject fly ash (rFA).

Compared with the influence of different chemical activators on the strength development, hydration degree of reject fly ash and hydration products, it can be found that the addition of Na 2SO 4 and K 2SO 4 can significantly increase the compressive strength at both early and later curing ages.

Comparing the influence of chemical reagents-Na 2SO 4 and K 2SO 4 on the strength development,hydration degree and porosity of reject fly ash blended cement pastes,it is found that the addition of these two chemical reagents can increase the compressive strength significantly at both early and later curing stages.