煤样破碎级和自然级浮沉产率差别 --

分析了原煤破碎级对浮沉试验结果的影响,说明随着煤样最大标称粒度的减小,煤样精煤产率变化很大,煤样破碎的粒级越小,对精煤产率的影响越大,精煤产率也就越高。万峰原煤不同最大粒度浮沉试验表明:对于最大标称粒度不大于50 mm的煤样,煤样经破碎后,浮沉试验精煤产率提高了16.41%,中煤、矸石产率分别降低了9.43%和1.16%;说明煤样经破碎后得到了进一步解离,精煤产率增加明显,结算时,公司需要额外支付多余的贷款。对于最大标称粒度大于50 mm的煤样,原煤筛分、浮沉试验结果显示,实际+0.5 mm原煤浮沉精煤产率为42.75%,若按汽车采样机所采煤样50～0.5 mm精煤产率55.25%上报,则精煤产率增加了29.24%,公司要多支付实际上不存在的这部分精煤产率的价格,损失重大;因此,必须将汽车采样机所采煤样的浮沉试验结果与+50 mm煤样浮沉产率结合修正后,才能得出煤样的真实浮沉试验结果。 The influence of sized fraction of raw coal on float-and-sink analysis show that,the clean coal yield varies greatly with the decrease of coal samples maximum nominal size.The smaller the sized fraction the higher clean coal yield.Changing the raw coal maximum size and crushing the coal samples,the float-and-sink tests show that,when the maximum nominal size is no greater than 50 mm,the clean coal yield improves by 16.41 percent,the middlings and gangue yield separately decrease 9.43 percent and 1.16 percent.That indicates coal samples reduction is beneficial for clean coal yield improvement.The plant need to pay extra loan.When the maximum nominal size is greater than 50 mm,the clean coal yield of +0.5 mm coal samples is 42.75 percent,which is 29.24 percent more than 55.25 percent of 50 ~0.5 mm coal samples cut by vehicle sampling machine.That means this nonexistent clean coal cost the plant lots of money.The float-and-sink tests results of coal samples cut by vehicle sampling machine is significantly different from that of +50 mm raw coal samples,so the only way the plant could get accurate float-and-sink tests results is to integrate and correct these two results