含硫度剂浸金应用基础的研究.pdf

西安建筑科技大学硕士论文 ~ 、」_‘，、__‘____卜_ 丫打刀。工1 言硫试刑浸金11用量俄研笼 学 生:宋永辉 导 师:兰新哲教授 摘 要 本论文在回顾含硫试剂的研究状况基础之上，主要对 !(ML) 宣全Mll I动‘力学作了研究，认为szog一是主要的溶金配离子，Sz离子在 浸出过程中破坏Au(OH):以及硫钝化层;并从热力学角度分析了s2-离子在 浸出阶段作为活化剂，在回收阶段作为沉淀剂的可能性。在给定实验条件下， 经计算求得ML最大溶金速率为5.99X10-mol/cmz·。，反应表观活化能为 24.53KJ/mol。另外，在溶金实验基础上形成ML法浸金新工艺，对金山金精 矿用该新工艺进行浸金实验，发现ML能够部分破坏FeS:包裹，使浸金率达 到邪%以上。通过对Na2S沉金的理论实验研究，考察时间、温度、pH、沉淀剂 用量以及搅拌速度等因素对沉淀效果的影响’确定了金“最”工艺。A 关键词:含硫试剂 ML) 动力学 浸出 y金 西安建筑科技大学硕士论文 THESTUDYONLEACHINGGOLD BY SULFUR一BEARING REAGENT Postgraduate;SongYongHui Tutor: ProfessorLanXingzhe Abstract 1hispaperdealsmainlywiththekineticsandthermodynamicsofML dissovhnggoldbasedonthecomparsivestudyofleachinggoldbythosesulphur bearingreagents. Itisfoundthatthiosulfatefunctionsasthemaincomplexingcoordinater whilethe(poly)sulfideionesactsasactivereagenttodestroythepassivelayerof aurrichydroxide(Au(OH)y)andelementsulfur.Thermodynamicsstudyalso showthatitispossiblefor(poly)sulfidesactingasactingreagentsduringgold leachingwhileasprecipitantduringrecovery. Themaximumdissolvingrateis5.99X1Q-mol八m:2·s,theapparent activeenergyiscalculatedtobe24.53KJ/mol,undertheexperimental conditions.Basedonthementionedtheoreticalstudy,anoptimalleaching conditionshasbeenobtained,withwhichgoldleachingefficencyforaconcentrate fromAnshanGoldMinehasreachedto930oandabove. XPSstudyrevealsthatpyrite(FeSz)hasbeenpartiallydissolvedduringML leaching.Throughtheoreticalandexperimentalstudy,theoptimalrecorvery conditionshasobtained,factorsinfluncingprecipitationsuchasagittingtime, stirringspeed,tamperature,pHaswellasconsumption