摘要
针对氧化锌矿中钙镁碳酸盐脉石含量高导致浮选分离困难、浸出酸耗高的问题,以碳链异构的异硬脂酸钠作为捕收剂,通过微浮选试验、Zeta电位测定、XPS分析及密度泛函理论计算等方法研究了菱锌矿与方解石反浮选分离行为及药剂在矿物表面的吸附作用机理。结果表明,增大矿浆pH值可以有效抑制菱锌矿的上浮,在强碱性的异硬脂酸钠体系下菱锌矿与方解石表现出了较好的反浮选分离趋势,在pH=11.5、捕收剂用量1.25×10^(-3) mol·L^(-1)的条件下,通过反浮选可脱除人工混合矿中62.1%的Ca,Zn的损失率为11.9%。与方解石相比,菱锌矿表面对水分子和OH-吸附能力明显更强,但对异硬脂酸根离子的吸附能力较弱;方解石表面与捕收剂分子之间存在明显的电子转移,矿物表面失去电子,羧基中的O原子周围电子密度增加,菱锌矿表面与捕收剂分子之间的电荷转移量相对较小。
Aimed at the issues of difficult flotation separation and high acid consumption during leaching caused by the high content of calcium and magnesium gangue minerals in zinc oxide ore,sodium isooctadecanoate with isomeric carbon chains was selected as flotation collector in this study.The reverse flotation separation behavior of smithsonite and calcite and the adsorption mechanism of collectors on the mineral surface were studied through micro-flotation tests,Zeta potential measurements,XPS analysis,and density functional theory(DFT)calculation.The results indicated that increasing the pH value could effectively inhibited the flotation of smithsonite.Under strongly alkaline conditions,smithsonite and calcite showed a good tendency for reverse flotation separation.When the pH=1l.5 and collector dosage was 1.25×10^(-3) mol·L^(-1),62.1%of Ca in the artificial mixed ore was removed with a Zn loss rate of 11.9%.Smithsonite has significantly a stronger adsorption capacity for water molecules and OH-ions,but a weaker adsorption capacity for isostearate ions.There is a noticeable electron transfer between the calcite surface and the collector,with the mineral surface losing electrons and the electron density around the O atoms in the carboxyl group increasing.The amount of charge transfer between the smithsonite surface and the collector molecules is relatively small.
作者
张晓亮
朱阳戈
赵志强
赵杰
ZHANG Xiaoliang;ZHU Yangge;ZHAO Zhiqiang;ZHAO Jie(BGRIMM Technology Group,Beijing 100160,China;State Key Laboratory of Mineral Processing,Beijing 102628,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《有色金属（选矿部分）》
CAS
2024年第8期151-160,共10页
Nonferrous Metals（Mineral Processing Section）
基金
中国博士后科学基金资助项目(2022M721432)
矿冶科技集团有限公司科研创新基金重点项目(02-2206)。
关键词
菱锌矿
方解石
反浮选
异硬脂酸钠
竞争吸附
smithsonite
calcite
reverse flotation
sodium isooctadecanoate
competitive adsorption
