黑岱沟煤矿底板煤分选可行性研究

Feasibility of separation of bottom coal of Heidaigou coal mine

为加强黑岱沟煤矿底板煤的综合利用率,扩大绿色开采利用规模,推进煤炭资源的高效提取利用,降低矸石固废的排放量,通过煤质特性、筛分、浮沉和转筒泥化试验,对其分选的可行性进行研究。结果表明,原煤发热量为8685.80 kJ/kg,属于高灰低硫低热的烟煤。对于粒度级为50.0~0.5 mm的原煤,当要求精煤灰分为12%时,自然级与破碎级综合样品的δ±0.1含量为32.87%,原煤可选性等级为难选;当要求精煤灰分为20%时,自然级与破碎级综合样品的δ±0.1含量为41.08%,原煤可选性等级为极难选。对于粒度级为<0.5 mm的原煤,将精煤灰分以20%作为参考,自然级与破碎级综合样品的δ±0.1含量为35.96%,原煤可选性等级为难选。当精煤灰分为12%时,分别使用三产品重介旋流器和重介浅槽分选,可得精煤产率为5.31%和2.56%,中煤产率为21.74%。为提高精煤产率,将精煤灰分限定在20%时,同样使用三产品重介旋流器和重介浅槽分选,可得精煤产率为14.39%和6.98%,中煤产率为11.74%。将对黑岱沟底板煤的分选利用提供指导,对其他高含碳量煤矸石的分选提炭提供参考。

In order to improve the comprehensive utilization rate of the bottom coal of Haidaigou coal mine,expand the utilization rate of green mining,promote the efficient extraction and utilization of coal resources,and reduce the discharge of gangue solid waste,the feasibility of its sorting was studied by means of coal quality characteristics,screening,flotation and sedimentation and rotary mudification experiments.The results indicate that the calorific value of the raw coal is 8685.80 kJ/kg,which is a bituminous coal with high ash,low sulfur and low heat.For the raw coal of size class 50.0-0.5 mm,when the ash content of clean coal is required to be 12%,theδ±0.1 content of the combined natural and crushed grade is 32.87%,and the optional grade of raw coal is difficult to be separated.When the ash content of clean coal is required to be 20%,theδ±0.1 content of the combined natural and crushed grade is 41.08%,and the raw coal selectability grade is extremely difficult to be separated.For the raw coal of<0.5 mm size class,when the ash content of the clean coal is set at 20%,theδ±0.1 content of the combined natural and crushed grade is 35.96%,and the raw coal selectability grade is difficult to be separated.When the ash requirement of the clean coal is 12%,using three-product dense medium cyclone sorting and heavy media shallow slot sorter respectively,the yield of clean coal can be obtained as 5.31%and 2.56%,and the yield of medium coal is 21.74%.This study will provide guidance for the sorting and utilization of Haidaigou bottom coal,and provide important reference for the sorting and carbon extraction of other coal gangue with high carbon content.