What are the methods to address the low fineness resulting from high hardness of refined coal?
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Our company mixes five types of refined coal in proportion with bituminous coal; one of these is gas coal with a Harz index of 45, while the others all have an index above 80； We use a single-stage crushing process; the coal processing rate is 200 tons per hour. Two crushers are in operation, one as the main unit and the other as a backup, with the crusher model being PFCK1616, powered by a 450KW high-pressure motor ； But in actual operation, the precision is only around 75%. If improving fineness is desired, the plan is 1: to replace it with a new high-power crusher ； 2. Pre-crush on the front of the system. The first method is the main one; if it can be implemented, the operation is simple. Has anyone experienced this?
To address this issue, we first crushed the hard bituminous coal to a particle size of around 65, and then added it to the process according to the normal ratio; after secondary crushing, the particle size reached around 90, which proves that the method of pre-crushing is feasible.