Study of the effect of desulphurization of the primary washing system and the scheme for its optimization at Yangquan No.1 Mine Coal Washery

The saleable coal product of the washery is considerably high in sulfur content, and, particularly, the problem relating to ineffective treatment of raw small coal has long remained unsolved. To revere this situation, the scheme for optimizing the existing washing washing process is proposed as follows: changing the jigging system to a gravity-fed 3-product heavy-medium cyclone system for enabling all raw coal to be washed; and adding raw small coal crushing link ahead of its washing process for controlling the upper size limit of the feed coal at around 6 mm. Though implementation of the scheme, it is expected to produce per year 1.50-2.00 Mt of clean small coal product with a sulfur content of less than 1.65%. The economic revenues thus yielded is anticipated to reach 100 million yuan.