鋅粉置換硫代硫酸鹽浸金液中金試驗(yàn)研究.pdf

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1、第36卷第3期礦冶工程V01．36№32016年O6月MININGANDMETALLURGICALENGINEERINGJune2016鋅粉置換硫代硫酸鹽浸金液中金試驗(yàn)研究①王杰’，張覃，李先海，沈智慧’，葉軍建'(1．貴州大學(xué)礦業(yè)學(xué)院，貴州貴陽(yáng)550025；2．貴州省非金屬礦產(chǎn)資源綜合利用重點(diǎn)實(shí)驗(yàn)室，貴州貴陽(yáng)550025；3．貴州省優(yōu)勢(shì)礦產(chǎn)資源高效利用工程實(shí)驗(yàn)室，貴州貴陽(yáng)550025)摘要：以10g／L金標(biāo)準(zhǔn)液與硫代硫酸鈉、氨水合成浸金液，采用鋅粉置換法回收所合成浸金液中的金。結(jié)果表明：鋅粉用量增加，金置換率提高；選取鋅粉

2、用量為0．4g／L，隨反應(yīng)時(shí)間增加，金置換率下降；浸金液中銅離子和單質(zhì)s、s0、s0，一等多硫化物對(duì)置換反應(yīng)不利；游離硫代硫酸鹽對(duì)置換影響較小；添加鉛鹽對(duì)置換反應(yīng)有利。SEM—EDS分析表明，經(jīng)5％乙酸鉛溶液浸泡后的鋅粉表面有鉛生成，生成的鉛與鋅形成電偶加速置換反應(yīng)，同時(shí)，鋅粉表面變蓬松，增大了鋅粉與Au(s：O，)的接觸面積，有利于置換反應(yīng)的進(jìn)行。關(guān)鍵詞：金；浸金液；硫代硫酸鹽；鋅粉；置換；鉛鹽；電偶中圖分類號(hào)：TF111文獻(xiàn)標(biāo)識(shí)碼：Adoi：10．3969／j．issn．0253-6099．2016．03．024文章編號(hào)

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氰化法提金是當(dāng)前處理金礦石或金精礦的主要方應(yīng)速度快、操作簡(jiǎn)單、回收率高、工藝相對(duì)成熟等優(yōu)點(diǎn)，法，具有回收率高、對(duì)礦石適應(yīng)性廣等特點(diǎn)¨。但氰最初被應(yīng)用于氰化法提金，目前是從硫代硫酸鹽法浸化物有劇毒性，對(duì)環(huán)境污染嚴(yán)重