Ca^(2+)影响辛基异羟肟酸浮选独居石的FTIR、XPS研究  

FTIR and XPS Studies on the Effect of Ca^(2+)on the Fotation of Monazite by Octyl Hydroxamic Acid

作　　者：刘荣祥 杨占峰 李解[3] 曹钊[1] 李强 李计川[1] LIU Rong-xiang;YANG Zhan-feng;LI Jie;CAO Zhao;LI Qiang;LI Ji-chuan(School of Mining and Coal,Inner Mongolia University of Science&Technology,Baotou 014010,China;Baotou Rare Earth Research Institute,Baotou 014060,China;School of Rare Earth Industry,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010 [2]包头稀土研究院,内蒙古包头014060 [3]内蒙古科技大学稀土产业学院,内蒙古包头014010

出　　处：《光谱学与光谱分析》2024年第10期2959-2967,共9页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(52264033,51964038);科技部国家重点研发计划课题(2020YFC1909101);内蒙古自治区科技计划项目(2021GG0438);内蒙古自然科学基金项目(2020MS05048)资助。

摘　　要：独居石浮选体系中往往有方解石、萤石、白云石等大量的伴生矿,而这些伴生矿在独居石矿中会解离出大量的Ca^(2+),而Ca^(2+)往往会影响矿浆浮选环境。为此,通过Ca^(2+)的溶液化学计算、独居石浮选试验,以及浮选条件下作用的独居石表面红外光谱分析(FTIR)和X射线光电子能谱(XPS),分析研究Ca^(2+)的影响。Ca^(2+)的溶液化学计算显示,在水溶液中,随着pH值的升高,Ca^(2+)分别以离子态、羟基络合物和氢氧化合物的形式存在,当pH值在7~8之间,优势组分为Ca^(2+)和Ca(OH)^(+)。独居石浮选结果表明,不添加Ca^(2+)时,捕收剂OHA不能充分的浮选独居石,回收率为75.37%;而在pH为8±0.5,加入3×10^(-4)mol·L^(-1)的Ca^(2+)剂量,可显著的提高OHA对独居石的浮选性能,回收率达到96.48%。由溶液化学计算可知,Ca(OH)+是活化独居石的优势组分;Ca^(2+)剂量大于3×10^(-4)mol·L^(-1)时浮选回收率下降幅度较大,说明Ca^(2+)剂量的进一步增加,反而抑制独居石浮选,只有一定剂量的Ca^(2+)有效的促进独居石浮选,这可能归因于Ca^(2+)剂量消耗了OHA的浓度,进而影响独居石的浮选。红外光谱分析表明,在Ca^(2+)的作用下,光谱中出现两个关键性的新峰,其一为1454 cm^(-1)处的N—O—H弯曲振动峰,其二为880 cm^(-1)处的O—N拉伸振动峰,而在2974和2928 cm^(-1)的有机峰—CH_(3)和—CH_(2)—峰明显增强,这些基团的出现表明发生了化学吸附且吸附强度大于纯独居石吸附OHA的效果。XPS分析表明,仅使用OHA吸附独居石,独居石表面的N元素相对含量较低,为0.61%,而Ca^(2+)处理后的独居石,OHA吸附独居石时,独居石表面的N元素相对含量较高,达到2.36,由此可以得出,Ca^(2+)会促进OHA吸附到独居石表面。从分峰拟合中可以看出,添加Ca^(2+)在独居石的解理面上氧原子与Ca(OH)^(+)反应形成O—Ca—OH基团,可以作为吸附OHA的新吸附位点,同时独居石的铈原子与OHA上的两个The monazite flotation system often has many associated minerals such as calcite,fluorite,and dolomite.These associated minerals will dissociate a large amount of Ca^(2+)in the monazite ore,and Ca^(2+)often affects the pulp flotation environment.In this paper,the surface properties of monazite were studied by FTIR and XPS when Ca^(2+)affected the flotation of monazite by octyl hydroxamic acid.The research method is mainly through the solution chemical calculation of Ca^(2+),the flotation test of monazite,and the surface infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)of monazite under flotation conditions.The solution chemical calculation of Ca^(2+)shows that an aqueous solution with increased pH value,Ca^(2+)exists in an ionic state,hydroxyl complex,and hydroxide compound,respectively.At the same time,the dominant components are Ca^(2+)and Ca(OH)^(+)at pH between 7 and 8.The results of monazite flotation showed that OHA could not fully float monazite without adding Ca^(2+),and the recovery rate was 75.37%.When the pH is(8±0.5),and the dosage of Ca Ca^(2+)is 3×10^(-4) mol·L^(-1),the flotation performance of OHA on monazite can be significantly improved,and the recovery rate reaches 96.48%.According to the solution chemistry calculation,Ca(OH)+is the dominant component of activated monazite.When the Ca^(2+)dose is greater than 3×10^(-4) mol·L^(-1),the flotation recovery rate decreases greatly,indicating that the further increase of Ca^(2+)dose inhibits the flotation of monazite.Only a certain dose of Ca^(2+)effectively promotes the flotation of monazite,which may be attributed to the consumption of OHA concentration by Ca^(2+)dose,which in turn affects the flotation of monazite.Infrared spectroscopy analysis showed that under the action of Ca^(2+),two key new peaks appeared in the spectrum,one was the N—O—H bending vibration peak at 1454 cm^(-1),the other was the O—N stretching vibration peak at 880 cm^(-1),and the organic peaks at 2974 and 2928 cm^(-1).The—CH_(3) and—CH_(2)—pe

关 键 词：独居石 浮选 辛基异羟肟酸 钙离子 红外光谱 分峰拟合 

分 类 号：TQ174[化学工程—陶瓷工业]