烟煤煤岩组分解离特性及分选研究

Research on liberation characteristics and separation of macerals for bituminous coal

以钱家营矿肥煤为研究对象,利用显微镜下观察法,研究了不同破碎粒度下煤岩组分的分布和解离特性,确定了不同破碎粒度下煤岩组分的单体解离度,并研究了不同破碎粒度下煤岩组分的离心分选效果。煤岩组分分布与解离特性表明,不同破碎粒度下,随着粒级降低,镜质组含量先缓慢增加,后迅速增加,惰质组含量先缓慢减小,后迅速减小;当破碎粒度为0.074mm时,镜质组单体解离度为90.77%,惰质组单体解离度为61.78%,说明镜质组比惰质组解离更彻底;不同破碎粒度下煤岩组分离心分选结果表明:当破碎粒度为0.074mm,分选密度为1.33kg/L时,可获得镜质组含量为89.77%,镜质组回收率为61.19%的富镜质组产品;若要提高惰质组单体解离度和惰质组脱除率,则需更深程度的破碎。

Based on fat coal from Qianjiaying coal mine,using microscope observation method,the paper studies the distribution and liberation characteristics, and determines the free fractional degree of macerals, and researches the maceral separation efficiency using density- based separation method under different crushing size. The distribution and liberation characteristics of maceral show that with the decrease in the size fraction,vitrinite content increases slowly first and then increase rapidly,while inertinite content decreases slowly first and then decreases rapidly; When coal crushing size comes to- 0. 074 mm,the free fractional degree of vitrinite reaches 90. 77%,that of inertinite reaches 61. 78%,which indicates that vitrinite is easier to dissociate than inertinite. Maceral separation of coal samples under different crushing size demonstrates that vitrinite- rich concentrate with a vitrinite content 89. 77% and vitrinite recovery 61. 19%can be obtained from density- based separation with separation density 1. 33 kg / L for- 0. 074 mm coal sample; Deeper crushing is needed for an increase of inertintie free fractional degree and removal rate.