Al-淀粉配合物对白钨矿浮选中微细粒方解石的选择性抑制行为及机理  

Selective Inhibition Behavior and Mechanism of Al−starch Complex on Ultrafine Calcite in Scheelite Flotation

作　　者：王若林 韩海生[2,3,4] 孙文娟 孙伟[2,3] 张洪亮[2,3] 程永彪[5] WANG Ruoin;HAN Haisheng;SUN Wenjuan;SUN Wei;ZHANG Hongiang;CHENG Yongbiao(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Clean and Efficient Utilization of Strategic calcium Mineral Resources in Hunan Province,Central South University,Changsha 410083,China;Technology Research Center of Hunan Province for Comprehensive Utilization of Associated Fluorite and Fluorine Chemical Engineering,Chenzhou 423000,China;Sinochem Lantian Group Co.Ltd,Hangzhou 310023,Zhejiang,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255000 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]中南大学战略含钙矿物资源清洁高效利用湖南省重点实验室,湖南长沙410083 [4]湖南省伴生萤石综合利用氟化学工程技术研究中心,湖南郴州423000 [5]中化蓝天集团有限公司,浙江杭州310023

出　　处：《矿产保护与利用》2023年第5期1-10,共10页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金委优秀青年项目(52122406);国家“十四五”重点研发计划项目(2022YFC2905105);湖南省高新技术产业科技创新引领计划(2022GK4056)。

摘　　要：微细粒方解石与白钨矿嵌布连生紧密,其体积小、质量轻、比表面积大,难以高效抑制,严重影响钨浮选指标的提升。通过合成反应、团簇模型计算及红外光谱分析,研究了铝离子与淀粉的作用产物;通过单矿物及实际矿石浮选实验,与苛化淀粉对比,揭示了Al-淀粉的选择性抑制效果;通过Zeta电位、X射线光电子能谱,剖析了Al-淀粉对微细粒方解石的选择性抑制机理。结果表明,Al^(3+)最容易与淀粉反式分子支链O_(6)和邻近O_(1)原子反应,生成键长最短的O_(1)—Al—O_(6)结构。苛化淀粉对白钨矿和方解石均产生抑制作用,而Al-淀粉只对微细粒方解石的浮选产生抑制效果,将钨精矿WO3品位由苛化淀粉的31.44%提升至40.51%,从而实现白钨矿与方解石的浮选分离。苛化淀粉通过羟基作用于白钨矿和方解石的表面,使两矿物的表面电位产生负偏移,影响两矿物表面的Ca、O特征原子。Al-淀粉通过金属基团,选择性地与方解石表面阴离子O位点发生化学吸附而不会与白钨矿表面发生作用,从而改变细方解石的表面电荷及特征原子,产生抑制作用。Ultrafine calcite was closely associated with scheelite,and its small volume,light weight,and large specific surface area resulted in difficulty inhibiting,which seriously affected the improvement of tungsten flotation index.In this study,the molecular structure of Al−starch was studied by synthesis reaction,cluster model calculation,and infrared spectrum analysis.The selective inhibition effect of Al−starch was revealed by flotation experiments of single mineral and actual ore,which was also compared with the effect of caustic starch.The selective inhibition effect of Al−starch was revealed by flotation experiments of single mineral and actual ore.The selective inhibition mechanism of Al−starch on fine calcite was analyzed by Zeta potential and X−ray photoelectron spectroscopy.The results confirmed that Al3+was most easily chelated with the O_(6) and O1 of the starch molecule of trans structure to form O_(1)—Al—O_(6) structure with the shortest bond length.Caustic starch could inhibit both scheelite and calcite,while Al−starch could only inhibit the flotation of ultrafine calcite,and increased the grade of WO_(3) in tungsten concentrate from 31.44%to 40.51% and realized the flotation separation of scheelite from calcite.The caustic starch made the surface potential of scheelite and calcite shift negatively through hydroxy,and also affected the surface characteristic atoms of Ca and O.Al−starch was selectively chemisorbed on the O site of the anionic group on the surface of calcite through metal group but did not affect the surface of scheelite,which changed the surface charge and characteristic atoms of ultrafine calcite and inhibit its flotation.

关 键 词：Al-淀粉 浮选 微细粒方解石 白钨矿 抑制机理 

分 类 号：TD923.14[矿业工程—选矿] TD954