新型苯氧乙基羟肟酸对白钨矿的浮选性能与吸附机理研究  

Study on Flotation Performance and Adsorption Mechanism of a New Benzyloxyethyl Hydroxamic Acid to Scheelite

作　　者：李方旭 刘硕 戴子林 张发明 蒋海勇 LI Fangxu;LIU Shuo;DAI Zi lin;ZHANG Fami ng;JIANG Hai yong(Institute of Resources Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510651,China;State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,Guangzhou 510651,China;Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources,Guangzhou 510651,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Guangzhou Yueyouyan Mineral Resources Technology Co,Guangzhou 510000,China)

机构地区：[1]广东省科学院资源利用与稀土开发研究所,广州510651 [2]稀有金属分离与综合利用国家重点实验室,广州510651 [3]广东省矿产资源开发和综合利用重点实验室,广州510651 [4]中南大学资源加工与生物工程学院,长沙410083 [5]广州粤有研矿物资源科技有限公司,广州510000

出　　处：《有色金属(选矿部分)》2025年第2期157-167,共11页Nonferrous Metals(Mineral Processing Section)

基　　金：国家重点研发计划项目(2023YFC3903905)。

摘　　要：以苯酚为原料,通过偶联反应和肟化反应得到新型苯氧乙基羟肟酸(PHA),并使用FTIR、LC-MS、NMR、单矿物和实际矿浮选试验、接触角、Zeta电位和XPS等方法表征了PHA的分子结构、浮选性能及在白钨矿表面的吸附机理。FTIR结果出现苯环和羟肟酸的特征吸收峰,分别位于1 492、1 441和1 645 cm^(-1);LC-MS谱出现了PHA的分子离子峰M/Z_[M+H,C_(8)H_(9)O_(3)N]=168.06;^(1)HNMR和^(13)CMNR结果也与预期一致。单矿物和实际矿浮选试验结果表明,PHA对方解石和萤石的选择性较好,捕收能力强于经典的苯甲羟肟酸;与硝酸铅组装后可进一步扩大钨-钙分离效果。在p H=9和PHA-Pb药剂用量为250 mg/L时,白钨的回收率为98.45%,而萤石和方解石的回收率仅有38.69%和31.95%。实际矿浮选结果表明,对给矿品位0.35%的黑白钨矿,PHA-Pb螯合物的回收率为85.82%,精矿品位为26.12%。接触角试验表明,PHA-Pb螯合物或PHA捕收剂用量和与吸附后白钨矿的疏水性成正相关关系,同时PHA-Pb螯合物处理样品的接触角大于PHA。Zeta结果表明,与PHA作用后,白钨矿电位在p H=3~11时负移,而PHA-Pb螯合物在p H=3~9时出现正移。FTIR结果表明矿物表面出现了PHA-Pb螯合物或PHA的C-N和-CH_(2)峰。XPS结果表明PHA或PHA-Pb通过化学反应可能形成W-PHA或W-Pb-PHA络合物吸附在白钨矿表面。FTIR、Zeta电位和XPS结果表明,PHA和PHA-Pb在白钨矿的表面的作用方式为化学吸附。研究为白钨矿浮选药剂分子设计与功能强化的理论研究提供了思路和借鉴。Benzene phenol was utilized as the precursor to synthesize a novel benzyloxyethyl hydroxamic(PHA)via coupling and oxime reactions.The molecular structure,flotation performance and adsorption of PHA on scheelite surface were characterized by FTIR,LC-MS,NMR,single mineral and actual ore flotation tests,contact angle measurements,Zeta potential analysis and X-ray photoelectron spectroscopy(XPS).FTIR results showed that the characteristic absorption peaks of benzene ring and hydroxamic acid were located at 1492,1441 and 1645 cm^(-1),respectively.The molecular ion peak M/Z_[M+H,C_(8)H_(9)O_(3)N]=168.06 of PHA appeared in LC-MS spectrum.^(1)HNMR and ^(13)CMNR results were also consistent with expectations.The results of single mineral and actual ore flotation tests showed that PHA exhibited excellent selectivity for calcite and fluorite while demonstrating superior capturing ability for scheelite compared to classical benzohydroxamic acid;Furthermore,when combined with lead nitrate,it significantly enhanced the tungsten-calcium separation efficiency.At pH=9 and with PHA-Pb complex dosage of 250 mg/L,the recovery of scheelite was 98.45%,while the recovery of fluorite and calcite was only 38.69%and 31.95%.The actual ore flotation results showed that the recovery rate of PHA-Pb chelate was 85.82%and the concentrate grade was 26.12%for the wolframite with a feed grade of 0.35%.The contact angle experiment showed that the amount of PHA-Pb complex or PHA collector was positively correlated with the hydrophobicity of scheelite after adsorption,and the contact angle of the sample treated with PHA-Pb chelate was greater than that of PHA.Zeta results showed that the scheelite potential shifted negatively at pH=3-11,while the scheelite potential shifts positively at PHA-Pb at pH=3-9.FTIR results showed that C-N and-CH_(2) peaks of PHA-Pb complex or PHA appeared on the surface of scheelite.XPS results showed that PHA or PHA-Pb compex may form W-PHA or W-Pb-PHA complex on scheelite surface.The results of FTIR,Zeta potential and XPS

关 键 词：浮选 羟肟酸 白钨矿 吸附机理 分子设计 

分 类 号：TD923[矿业工程—选矿]