摘要
通过辉钼矿单矿物浮选试验,Ca^(2+),Mg^(2+)的溶液化学计算及辉钼矿表面Zeta电位和XPS检测,对比研究了Ca^(2+),Mg^(2+)对辉钼矿可浮性影响的差异性。结果表明,Ca^(2+),Mg^(2+)均会吸附于辉钼矿表面,改变辉钼矿表面Zeta电位并对辉钼矿的可浮性产生抑制作用,且随pH值增大,抑制作用增强;碱性条件下Mg^(2+)对辉钼矿可浮性的抑制强于Ca^(2+),且pH>9.0时,两种离子抑制作用的差异性更明显;pH=11.0时,Mg^(2+)为800 mg/L的矿浆中辉钼矿的回收率较Ca^(2+)为800 mg/L的矿浆中辉钼矿的回收率下降约34个百分点;Ca^(2+),Mg^(2+)均能与辉钼矿“棱”上的MoO4^(2–)结合形成钼酸盐沉淀,通过化学吸附的形式存在于辉钼矿表面;当pH>9.15时,钙仍以Ca^(2+),Ca(OH)+的形态存在并吸附于辉钼矿表面,且Ca^(2+)矿浆Zeta电位随pH增大呈上升趋势,但镁则以Mg(OH)2形态沉积于辉钼矿表面,且Mg^(2+)矿浆Zeta电位随pH增大迅速降低,这是两种离子对辉钼矿可浮性抑制作用不同的主要原因。
Ca^(2+)and Mg^(2+)are inevitably introduced into the production backwater when the mineral processing plants treat wastewater with precipitation agent,both of them would affect the flotation effect of molybdenite.The different influence of Ca^(2+)and Mg^(2+)on the flotation of the molybdenite was compared and investigated by flotation experiments of pure minerals,measurements of zeta-potential,X-ray photoelectron spectroscopy(XPS)and solution chemistry of Ca^(2+)and Mg^(2+).The results showed that both Ca^(2+)and Mg^(2+)could be adsorbed on the surface of the molybdenite,which changed the surface zeta-potential of the molybdenite and inhibited the floatability of the molybdenite.The inhibition was stronger with the increase of the pH value.Under the alkaline condition,the inhibition of Mg^(2+)on floatability of the molybdenite was stronger than that of Ca^(2+).And when the pH value was more than 9.0,the inhibition difference between the two ions was observed.When pH=11.0,the recovery of Mg^(2+)with a concentration of 800 mg/L decreased by about 34 percentage points compared with that of Ca^(2+)with a concentration of 800 mg/L.Both Ca^(2+)and Mg^(2+)could combine with MoO4^(2–)on the“edge”of molybdenite and form precipitation of molybdate salt,which existed on the surface of molybdenite in the form of chemical adsorption.When pH value was more than 9.15,calcium still existed in the form of Ca^(2+)and Ca(OH)+and adsorbed on the surface of molybdenite,and the zeta-potential of the molybdenite in slurry containing Ca^(2+)showed an increasing tendency with the increase of the pH value.While magnesium deposit on the surface of molybdenite in the form of Mg(OH)2,and the zeta-potential of the molybdenite in pulp containing Mg^(2+)decreased rapidly with the increase of the pH value.This is the main reason for the difference between Ca^(2+)and Mg^(2+)in molybdenite¢s floatability inhibition.
作者
施帅
何廷树
李慧
Shuai SHI;Tingshu HE;Hui LI(School of Resources Engineering,Xi¢an University of Architecture and Technology,Xi¢an,Shaanxi 710055,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2021年第2期153-159,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51674184,51904222)
陕西省自然科学基础研究计划—一般项目(编号:2019JQ-468)。
关键词
辉钼矿
钙镁离子
可浮性
抑制作用
差异性
molybdenite
calcium and magnesium ions
floatability
inhibition
difference
