新型双极性捕收剂烷基羟肟酸磺酸对白钨矿的浮选性能及吸附机理研究  

Floatation Performance and Adsorption Mechanism of A Novel Bipolar Collector Alkyl Hydroxamic Acid Sulfonate for Scheelite

作　　者：刘硕 李方旭 戴子林 LIU Shuo;LI Fangxu;DAI Ziin(Institute of Resource Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510650,China;School of Resource Processing and Bioengineering,Central South University,Changsha 410083,China;State Key Laboratory of Separation and Utilization of Rare Metals,Guangzhou 510650,China;Guangdong Key Laboratory of Mineral Resources Development and Comprehensive Utilization,Guangzhou 510650,China)

机构地区：[1]广东省科学院资源利用与稀土开发研究所,广东广州510650 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]稀有金属分离与综合利用国家重点实验室,广东广州510650 [4]广东省矿产资源开发和综合利用重点实验室,广东广州510650

出　　处：《矿产保护与利用》2023年第5期11-18,共8页Conservation and Utilization of Mineral Resources

基　　金：岭南优势特色矿产资源高效利用与应用开发(0922280503);南岭钨锡钼铋资源综合开发与精深加工利用集成示范(0922221031);广东省科学院发展专项资金项目(2022GDASZH-2022010104,2023GDASZH-2023010104)。

摘　　要：以廉价且广泛应用的脂肪酸甲酯磺酸钠和盐酸羟胺为原料,合成了新型捕收剂-烷基羟肟酸磺酸(MES)。通过单矿物和实际矿浮选试验、傅立叶红外光谱(FTIR)、接触角测试、Zeta电位和X射线光电子能谱(XPS)分析研究了其浮选性能和吸附机理。单矿物浮选试验结果表明,与油酸相比,MES对白钨矿的选择性优于方解石和萤石,在pH=10.0和药剂用量为30 mg/L时,白钨矿、方解石、萤石回收率分别为85.9%,62.8%和53.5%。实际矿石浮选试验结果表明,对于给矿品位为0.27%的白钨矿,MES所得钨精矿品位高于油酸;在矿浆pH=10.0,水玻璃用量为1000 g/t、MES用量为720 g/t的浮选条件时,钨精矿的品位为1.40%和回收率为78.89%。接触角试验结果显示,随着MES用量增大,白钨矿的接触角变大,与单矿物浮选浓度实验表现一致。Zeta电位与FTIR分析结果显示,与MES作用后,白钨矿的电负性增加,矿物表面出现了MES中的CH_(3)、-CH_(2)、O=C-NH和O=S=O基的红外特征峰;这表明MES已牢固得吸附在白钨矿表面。此外,XPS分析结果表明MES通过-CONHOH和-SO_(3)H与白钨矿表面的Ca、W原子发生化学反应形成Ca和W-MES络合物。A novel collector,alkyl hydroxamic acid sulfonate(MES),was synthesized using the inexpensive and widely utilized raw materials of fatty acid methyl ester sodium sulfonate and hydroxylamine hydrochloride.The flotation performance and adsorption mechanism of individual minerals were investigated using Fourier-transform infrared spectroscopy(FTIR),Zeta potential analysis,and X-ray photoelectron spectroscopy(XPS).The results of micro-flotation test revealed that compared to oleic acid,scheelite exhibited better selectivity than calcite and fluorite.At a pH of 10.0 and a dosage of 30 mg/L,the recoveries for scheelite,calcite,and fluorite were 85.9%,62.8%,and 53.5%respectively.Batch flotation test outcomes demonstrated that for actual ore with a feed grade of 0.27%,the tungsten concentrate grade obtained using MES was higher than that achieved with oleic acid.Under the flotation conditions of pulp pH=10.0,sodium silicate dosage at 1000 g/t,and MES dosage at 720 g/t,the tungsten concentrate grade was measured at 1.40%with a recovery rate of 78.89%.Contact angle test results indicated the contact angle increased with the increase of MES dosage,consistent with findings from the single mineral flotation concentration experiment.Zeta potential and FTIR analyses revealed an increase in the electronegativity of scheelite after MES treatment,and characteristic peaks corresponding to-CH_(3),-CH_(2),O=C-NH,and-SO_(3)H in MES appeared on the surface of scheelite,indicating firm adsorption by MES onto its surface.Additionally,XPS analysis confirmed that MES chemically reacted with the Ca and W atoms through-CONHOH and-SO3H,forming M-MES(M=Ca,W)complexes adsorbed onto scheelite surfaces.

关 键 词：白钨矿 捕收剂 吸附 羟肟酸 磺酸 

分 类 号：TD923.13[矿业工程—选矿] TD954