山脚树矿选煤厂技术改造

Technical transformation of Shanjiaoshu coal preparation plant

论述了山脚树矿选煤厂原有洗选工艺流程,针对生产中存在的矿井原煤煤质变化大、煤泥含量高、介质消耗大等问题,提出技术改造方案.在原有工艺基础上增加原煤脱泥系统和粗煤泥回收系统,改造后洗选工艺流程为：原煤预先脱泥＋无压三产品重介质旋流器＋对流干扰沉降分选机（TBS）＋浮选联合分选工艺.改造后,选煤厂生产方式更加灵活多变,产品适应市场能力强,设备先进可靠,高效低耗,基本解决了生产中存在的问题.选煤厂生产能力由2.6 Mt/a提高至3.0 Mt/a,提高了18.7％;原煤脱泥筛脱泥效率可提高至75％以上;TBS分选机洗选效率为69.82％,可能偏差Ep为0.12;选煤厂介质消耗2.2～ 2.8 kg/t,比原系统降低50％左右,年节约介质粉约7500 t,节约生产成本550万元/a以上.原煤脱泥筛与TBS的配合使用基本解决了原煤煤质变化对商品煤质量的影响,提升了企业竞争力.

There were lots of problems in original washing process of Shanjiaoshu coal preparation plant, such as unstable feed coal quality, large slime content and medium consumption. To resolve these problems, install feed coal desliming system and coarse slime recovery system based on the original process. After transformation, the washing process combines feed coal predesliming, three-product dense-medium cyclone, teetered bed separator （TBS） and flotation. The production becomes more flexible, the products can meet the need of the market. Th production capacity increases from 2.6 Mt/a to 3.0 Mt/a,the growing rate is 18.7 percent. The desliming efficiency increase to over 75 percent, the separation efficiency of TBS is 69. 82 percent, the ecart probable moyen E, is 0. 12, the medium consumption,decreasing by 50 percent, range from 2.2 kg/t to 2. 8 kg/t. The plant saves medium and production cost 7500 tons ,5.5 ~106 yuan per year. The combination of feed coal desliming sieve and TBS eliminates the effects of feed coal quality change on commercial coal quality.