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时间:2020-03-26
《锌粉置换硫代硫酸盐浸金液中金试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第3期矿冶工程V01.36№32016年O6月MININGANDMETALLURGICALENGINEERINGJune2016锌粉置换硫代硫酸盐浸金液中金试验研究①王杰’,张覃,李先海,沈智慧’,叶军建'(1.贵州大学矿业学院,贵州贵阳550025;2.贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025;3.贵州省优势矿产资源高效利用工程实验室,贵州贵阳550025)摘要:以10g/L金标准液与硫代硫酸钠、氨水合成浸金液,采用锌粉置换法回收所合成浸金液中的金。结果表明:锌粉用量增加,金置换率提高;选取锌粉
2、用量为0.4g/L,随反应时间增加,金置换率下降;浸金液中铜离子和单质s、s0、s0,一等多硫化物对置换反应不利;游离硫代硫酸盐对置换影响较小;添加铅盐对置换反应有利。SEM—EDS分析表明,经5%乙酸铅溶液浸泡后的锌粉表面有铅生成,生成的铅与锌形成电偶加速置换反应,同时,锌粉表面变蓬松,增大了锌粉与Au(s:O,)的接触面积,有利于置换反应的进行。关键词:金;浸金液;硫代硫酸盐;锌粉;置换;铅盐;电偶中图分类号:TF111文献标识码:Adoi:10.3969/j.issn.0253-6099.2016.03.024文章编号
3、:0253-6099(2016)03-0091-03ExperimentalStudyonRecoveringGoldfromThiosulfateLeachingLiquidwithZincPowderWANGJie,,ZHANGQin’,LIXian—hai’,SHENZhi.hui',YEJun-jian',(1_~ningCollege,GuizhouUniversity,Guiyang550025,Guizhou,China;2.GuizhouKeyLaboratoryofComprehensiveUtilizat
4、ionofNon—metallicMineralResources,Guiyang550025,Guizhou,China;3.GuizhouEngineeringLabofMineralResources,Guiyang550025,Guizhou,China)Abstract:Testwasconductedonrecoveringgoldbyzincpowderreplacementfromasimulatedthiosulfateleachingliquidthatwaspreparedwith10t,g/Lofgo
5、ldstandardsolution,Na2S2O3·5H2OandNH3·H2O.Resultsshowedthatanincrementofzincpowderdosagecouldincreasethegoldreplacementrate.Withthedosageofzincpowderat0.4g/L,thegoldreplacementratewasdecreasedwiththereactiontimeprolonged.ItisfoundthatCu,S,SO4一andSO3一i’nthegold-leac
6、hingliquidareunfavorableforreplacementprocess,andthefreethiosulfatehaslitdeinfluenceonthereplacement.However,theadditionofleadsahsisfavorableforthereplacement.ThefollowingSEM-EDSanalysisshowedthatleadwasgeneratedonthesurfaceofzincpowderafterbeingsoakedinthe5%leadac
7、etatesolution.Thosegeneratedleadreactedwithzinctoformgalvaniccouple,whichacceleratedthereplacementprocess.Meanwhile,thefluffyzincpowderenlargedthecontactsurfacebetweenzincandAu(S2O3)23-,thatwasbenefici~tothereplacementtoo.Keywords:gold;gold—leachingliquid;thiosulfa
8、te;zincpowder;replacement;lead;galvanic氰化法提金是当前处理金矿石或金精矿的主要方应速度快、操作简单、回收率高、工艺相对成熟等优点,法,具有回收率高、对矿石适应性广等特点¨。但氰最初被应用于氰化法提金,目前是从硫代硫酸盐法浸化物有剧毒性,对环境污染严重
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