Four indexes suitable for evaluation of technical economy of coking coal preparation plant

Four indexes suitable for evaluation of technical economy of coking coal preparation plant is proposed according to the concept of misplaced material in GB/T15715 Coal gravity separating equipment-Performance evaluation. Combined with yield and corresponding ash content of clean coal,middlings and refuse,these indexes can be simply calculated on the basis of two stage float-and-sink（ quick float） test data,which is convenient for coal preparation plant to evaluate technical economy.