摘要
某难选高镁低品位锌矿主要有价元素Zn和Cd含量分别为1.60%和50.60×10^(-6),主要赋存在铁闪锌矿中,矿石中主要杂质成分SiO_(2)和MgO含量分别为37.66%和34.47%,脉石矿物以蛇纹石、辉石、角闪石和绿泥石为主。为有效地解决高含量蛇纹石恶化锌浮选指标的问题,通过浮选试验、FTIR分析和SEM-EDS分析等多种方法,研究了柠檬酸+六偏磷酸协同抑制机理。浮选试验结果表明:在磨矿细度(-0.075 mm含量)为75.23%的条件下,以柠檬酸+六偏磷酸作为蛇纹石抑制剂,以CuSO_(4)作为铁闪锌矿活化剂、丁基黄药作为捕收剂,经一粗二扫二精,获得锌精矿中锌、镉和氧化镁含量分别为48.52%、1400×10^(-6)和1.92%,对应的回收率分别为89.47%、84.20%和0.16%。FTIR分析结果表明,柠檬酸+六偏磷酸钠可能以络合作用形式吸附在蛇纹石表面;SEM-EDS分析结果显示,柠檬酸+六偏磷酸钠有效地缓解了蛇纹石与铁闪锌矿的异相凝聚。
A refractory zinc ore,distinguished by its high magnesium content and low grade,was found to contain valuable elements,primarily zinc and cadmium,with concentrations of 1.60%and 50.60 g/t,respectively,predominantly hosted within marmatite.The principal impurities in the ore were identified as SiO_(2)and MgO,with concentrations of 37.66%and 34.47%,respectively.The gangue minerals were primarily composed of serpentine,pyroxene,amphibole,and chlorite,with marmatite exhibiting a complex paragenetic relationship with these magnesium-bearing gangue minerals.To effectively mitigate the adverse effects of high serpentine content on zinc flotation performance,a series of systematic single-factor flotation condition tests were conducted.The interaction mechanism between a combined reagent of C_(6)H_(8)O_(7)+(NaPO_(3))_(6) and serpentine was analyzed using infrared spectroscopy.Additionally,changes in the elemental composition and morphological characteristics on the surface of marmatite,both before and after treatment with C_(6)H_(8)O_(7)+(NaPO_(3))_(6),were meticulously examined using scanning electron microscopy and energy dispersive spectroscopy(SEMEDS).The optimal technical parameters for the roughing flotation stage were ascertained through experimental investigations.These parameters comprised a grinding fineness of 75.23%passing 0.075 mm,a C_(6)H_(8)O_(7) dosage of 600 g/t,a(NaPO_(3))6 dosage of 800 g/t,a CuSO_(4) dosage of 500 g/t,a butyl xanthate dosage of 120 g/t,and a No.2 oil dosage of 24 g/t.Utilizing a closed-circuit flotation flowsheet characterized by“one roughing,two scavenging,and two cleaning stages,with middlings sequentially returned to the preceding stage”,a final zinc concentrate was effectively produced.This concentrate exhibited an assay of 48.52%Zn,1400×10^(-6) Cd,and 1.92%MgO,with respective recoveries of 89.47%for zinc,84.20%for cadmium,and 0.16%for magnesium oxide.Infrared spectroscopy analysis indicated that the interaction with the C_(6)H_(8)O_(7)+(NaPO_(3))6 reagent system resulted in the emergence of two new distinct absorption peaks on the serpentine surface.The observed spectroscopic features were identified as the C=O and P=O stretching vibration peaks.Simultaneously,the Mg-O out-of-plane vibration peak exhibited a shift from its initial position at 567 cm^(-1) to 546 cm^(-1).These spectroscopic alterations suggest that the reagent combination likely adsorbs onto the serpentine surface through complexation.Further corroboration was provided by SEM-EDS analysis,which revealed that post-treatment with C_(6)H_(8)O_(7)+(NaPO_(3))_(6),elements such as O,Mg,and Si were no longer detectable on the marmatite surface.Notably,the marmatite surface was predominantly devoid of adhering serpentine particles.This compelling evidence indicates that the application of C_(6)H_(8)O_(7)+(NaPO_(3))_(6) effectively mitigates hetero-coagulation between serpentine and marmatite,thereby significantly enhancing the selectivity of the flotation process.
作者
葛阳阳
张凯熙
田江涛
汪亚轩
王素
危刚
曹月明
GE Yangyang;ZHANG Kaixi;TIAN Jiangtao;WANG Yaxuan;WANG Su;WEI Gang;CAO Yueming(Hebei Research Center for Geoanalysis,Baoding 071052,Hebei,China;Hebei Key Laboratory of Mineral Resources and Ecological Environment Monitoring,Baoding 071052,Hebei,China)
出处
《黄金科学技术》
北大核心
2026年第1期220-230,共11页
Gold Science and Technology
基金
河北省地质矿产勘查开发局地质科技项目“伴生锌镉矽卡岩型铁尾矿协同回收及无害化研究”(编号:13000024P003294102610)资助。
关键词
高镁
铁闪锌矿
蛇纹石
柠檬酸
异相凝聚
镉
high-magnesium
marmatite
serpentine
citric acid
hetero-coagulation
cadmium
