Exploration and practice of reducing medium consumption in Xinyao Coal preparation Plant

In order to reduce medium consumption, work is made by Xinyao Plant on a thorough check-up of the coal washing systems. It is revealed that the high medium consumption is mainly attributed to a medium recovery system in common use by coarse and small coal, low efficiency of raw coal screening process, instability of feed to clean coal magnetic separator, and inadequacy in production management and equipment maintenance work. To tackle these problems, targeted technical transformation and management upgrading work are made in the following aspects: cancellation of the commonly used medium recovery system, letting the correct medium beneath the clean small coal and refuse medium draining sieve bends flow directly back to mixing tank; switching the dry process for sizing raw coal at 18 mm to a wet one, increase of make-up water to dilute-medium section of medium draining screen, decrease of magnetic separator′s feed concentration, making timely adjustment of throttle damper in magnetic separator′s medium tank, cleaning magnetic separator′s feed tank and medium recovery channels beneath separator′s drum to create for the separator an overall favorable working condition, stricter control of acceptance of purchased magnetite power, strengthening of management of medium draining screen′s water spray and screenplate, as well as the phenomena of escape, oozing dripping and leaking of medium from washing system. With the implementation of the measures as described above, a tangible result has been obtained, making it possible for the consumption of medium to reduce from 1.91 kg to 0.73 kg for treating each ton of raw coal.