Assessment of working performance of the clean coal medium draining sieve bend

The working performance of the sieve bend used for draining off medium solids from clean coal used at Gengyang Coal Washery is assessed in a scientific manner based on the industrial test data and by following the relevant standards and specified methods.Result of study shows that the sieve bend works with a remarkable medium draining,desliming and dewatering performance as evidenced by the facts that: the magnetics removal rate for the ＜ 2 mm size coal reaches 96.81%; the dewatering rate for the 0-70 mm whole size range is 95.47% while the rate of correctly placed material of the ＜ 0.25 mm finer size is as high as 95.77%; and its capacity in retaining and recovery of the 1-0.25 mm coarser size is not so high as expected,and 62.29% of the coarser size is seen to be reported to the bend’s dense medium underflow.