红外拟合光谱分析微波对重晶石浮选的影响机理  

Influence Mechanism of Microwave on Barite Flotation Based on Infrared Fitting Spectrum Analysis

作　　者：武靖轩 李解 林嘉威 弋诗文 李敏 苏文柔 WU Jing-xuan;LI Jie;LIN Jia-wei;YI Shi-wen;LI Min;SU Wen-rou(Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学,内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《光谱学与光谱分析》2021年第10期3083-3091,共9页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(51964038);内蒙古自然科学基金项目(2020MS05048,2020BS05029);包头市科技计划项目(2019Z3004-5);内蒙古自治区高等学校科学研究项目(NJZY19129);内蒙古自治区重大基础研究开放课题(0406091701)资助。

摘　　要：目前浮选提高重晶石品位的方法通常采用新型浮选药剂从低品位重晶石矿中进行分选,采用微波加热预处理矿物可提高浮选回收率,但微波对浮选药剂与矿物的作用机理还不清楚。微波加热技术近年来用于矿物加工、冶金与材料制备等领域,具有反应速度快、产品指标高等优点。以油酸钠为捕收剂,对微波预处理后的重晶石纯矿物进行浮选,并对不同微波作用时间下的重晶石浮选样品进行红外光谱检测,通过红外拟合平滑光谱和二阶导数光谱计算分析,研究微波对重晶石浮选的影响机理。浮选试验结果表明,未经微波预处理的重晶石,在油酸钠用量为55 mg·L^(-1)、pH值为8.0的条件下,浮选指标最佳,回收率为91.41%;而对比之下,经微波作用后的重晶石进行浮选,随着微波处理时间的增加浮选指标逐渐提高,且在微波作用60s时的回收率最高,达95.27%。基于浮选试验的红外光谱分析表明,重晶石未经微波预处理进行浮选,与油酸钠作用,在波数为3004 cm^(-1)处—CH_(2)—的对称伸缩振动峰、2953 cm^(-1)处—CH _(3)的反对称伸缩振动峰、1119和1077 cm^(-1)处SO_(4)^(2-)的非对称伸缩振动峰均发生了红移,说明油酸钠在重晶石表面发生化学吸附;而经微波预处理后的重晶石浮选时,在波数为2853 cm^(-1)处—CH_(2)—对称伸缩振动峰、2923 cm^(-1)处—CH_(2)—反对称伸缩振动峰、2958 cm^(-1)处—CH _(3)反对称伸缩振动峰、1181,1122和1086 cm^(-1)处SO_(4)^(2-)非对称伸缩振动峰、982 cm^(-1)处SO_(4)^(2-)对称伸缩振动峰、635和610 cm^(-1)处SO_(4)^(2-)弯曲振动峰,其峰位并未发生红移,但峰强随着微波作用时间的增加明显加强,且微波作用60 s时其峰强增加最明显;对微波处理后的红外光谱进行拟合平滑光谱和二阶导数光谱计算发现,在波数为2958,2923,2853,1181,1122,1086,982,635和610 cm^(-1)处峰面积均有不同程度的增加,且在微波作用60sAt present,methods of separating from low-grade barite ore are usually adopted to improve the grade of barite in flotation by using new flotation reagents,and the recovery of flotation can be improved by microwave pretreatment of the mineral before flotation,but the mechanism of microwave on flotation reagents and minerals are not yet known.In recent years,microwave heating technology has been used in mineral processing,metallurgy and material preparation and so on,with the advantage of fast reaction speed and high product index.In this paper,sodium oleate was used as a collector in the flotation tests of the pure barite mineral after microwave pretreatment,and the infrared spectrum detection was carried out for the barite flotation samples under different microwave heating times.The effect mechanism of microwave on barite flotation was discussed by the infrared spectral analysis of fitting smooth spectrum and second derivative spectrum.The flotation test results showed that the barite without microwave pretreatment had the best flotation index and recovery of 91.41%under the conditions of sodium oleate dosage of 55 mg·L^(-1) and pH value of 8.0.In contrast,the flotation index of barite treated with microwave increased gradually with the increase of microwave treatment time,and the recovery rate of barite treated with microwave in the 60 s was the highest,reaching 95.27%.Infrared spectrum analysis based on flotation test showed that in the flotation of barite without microwave pretreatment interacted with sodium oleate,the red shift of-CH_(2)-symmetric stretching vibration peak at wavenumber 3004 cm^(-1),-CH _(3) antisymmetric stretching vibration peak at wavenumber 2953 cm^(-1),SO 24 asymmetric stretching vibration peak at wavenumber 1119 and 1077 cm^(-1)were all found,indicating chemical adsorption of sodium oleate on the surface of barite was happened;By contrast,in the flotation of barite after microwave pretreatment interacted with sodium oleate,the red shift of-CH_(2)-symmetric stretching vibration peak at

关 键 词：傅里叶变换红外光谱 微波 重晶石 拟合平滑光谱 二阶导数光谱 

分 类 号：TD985[矿业工程—选矿]