降低矸石带煤率的方法

中国目前入选原煤中60%左右是跳汰洗选。在跳汰选煤过程中,影响跳汰机分选效率的因素有入料原煤特性,跳汰机风阀周期特性(跳汰频率及进、排气时间),矸石段、中煤段排料情况,各室顶水情况,风压、水压等,并且诸因素间相互制约,再加上人为因素的影响,既兼顾精煤质量又提高分选效率非常困难。以济三煤矿选煤厂BATAC跳汰机为例,通过改善风量与水量的配比,改造跳汰机筛板,稳定床层的同时,保证了精煤灰分,矸石带煤率由原先的6%降至5%以下,提高了精煤回收率,为选煤厂带来明显的经济效益。 At present,about 60 percent of feed coal are separated by jigging in China. The influencing factors of the jigging are feed coal properties,characteristics of jig air valve including jig frequency,inlet and exhaust period, discharging condition of gangue and middlings stage,backwater condition,air and water pressure,personal factor. The factors restrict mutually,so it's difficult to guarantee clean coal quality and separation efficiency. Taking Bardac jig in the coal preparation plant of Jining NO. 3 coal mine for example,optimize the ratio of air volume and water volume,transform the sieve plate of jig. The transformation stabilizes the jig bed and ash of clean coal,decreases the clean coal content mixed in gangue from 6 percent to 5 percent,increases the recovery of clean coal,brings considerable economic benefits