矿浆pH对煤岩显微组浮选分离效果的影响

Effect of pH of pulp on flotation separation of microgroup of coal and rock

利用浮选法处理煤岩原料获得惰质组和镜质组2种浮选分离样本,使用盐酸与氢氧化钠调节样品矿浆pH,测试不同矿浆pH下浮选分离样品的回收率、稳定性、Zeta电位变化及惰质组的铝离子浓度变化。结果表明,镜质组和惰质组pH=5时,最高浮选回收率分别为91.3%和45.9%,均在pH=5时稳定性最佳,镜质组的浮选分离效果明显高于惰质组;镜质组的Zeta电位变化也高于惰质组,说明适当调节矿浆pH会影响颗粒物质在液体中的分散或聚集状态,改变整个矿浆体系的稳定性与沉降情况;弱碱或弱酸环境能保证显微组铝离子浓度较高,获得较好显微组浮选分离效果。

Two kinds of flotation separation samples of inertinite and vitrinite were obtained by flotation treatment of coal and rock raw materials.Hydrochloric acid and sodium hydroxide were used to adjust the pH of sample pulp.The recovery rate,stability,Zeta potential change and aluminum ion concentration change of flotation separation samples at different pulp pH were tested.The results show that when pH=5,the highest flotation recovery rates of vitrinite and inertinite are 91.3%and 45.9%,respectively,and both show the best stability at pH=5.The flotation separation effect of vitrinite is obviously higher than that of inertinite.The Zeta potential of vitrinite is also higher than that of inertinite,indicating that proper adjustment of pulp pH will affect the dispersion or aggregation state of particulate matter in liquid,and change the stability and settlement of the whole pulp system.Weak base or weak acid environment can ensure higher concentration of aluminum ions in microgroup and obtain better flotation separation effect of microgroup.