夕张新矿开采的是-600米以下夕张夹煤层的优质原煤。从1975年6月投产以来,六块矸石经常混入原煤,在这种情况下选择性破碎机产生了过粉碎,恶化了入洗原煤,引起了跳汰机处理量的降低。原煤本身的可碎性比预计的要大,一大半煤成为筛下原煤,选择性破碎机的进料主要是大块矸石。这样选择性破碎机就经常产生过负荷,这时选择性破碎机的筛下物经常有灰分70％以上的矸石。针对这种情况,现场进行了改进试验,报告如下。 Xi Zhang new mining is -600 meters below the Xi Zhang folder coal quality coal. Since the start-up in June 1975, six gangues have been frequently mixed with raw coal. In this case, the selective crusher produces over-crushing and worsens the coal washing, resulting in a decrease in the throughput of the jig. The crushability of the coal itself is larger than expected, a large part of the coal becomes the raw coal under the sieve, and the feed of the selective crusher is mainly a large gangue. Such selective crusher often produce overload, then selective crusher sieve material often have ash more than 70% of the gangue. In view of this situation, the site conducted an improvement test, the report is as follows.