| Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching |
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| 作者姓名： | WANG Yun-yan |
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| 作者单位： | School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China |
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| 基金项目： | Project( 5 0 0 0 4 0 0 9)supportedbytheNationalNaturalScienceFoundationofChina |
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| 摘 要： | 1 INTRODUCTIONThiourea ,asanontoxic goldleachingreagentsubstitutingcyanide ,hasattractedtheinterestofmanyresearchersallovertheworldsincethedissolu tionofgoldinthioureasolutionwasfirstreportedin194 1,andaseriesofstudiesonthetheoryandtech nologyforleachinggoldbythioureahavebeencon ducted1 3] .Mostreportson golddissolutioninthioureasolutionwereconcernedwithacidicmedia .Itwasdifficultforgoldtodissolveinalkalinesolutionbecauseofthepassivationofelementsulfurproducedbytheirreversibledecompositi…
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| 修稿时间： | 18 March 2003 |
Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching |
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| Wang Yun-yan , Chai Li-yuan , Min Xiao-bo , He De-wen and Peng Bing.Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching[J].Journal of Central South University of Technology,2003,10(4):292-296. |
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| Authors: | Wang Yun-yan Chai Li-yuan Min Xiao-bo He De-wen and Peng Bing |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | Na2SiO3 and Na2SeO3 were chosen as stable reagents of alkaline thiourea solution substituting Na2SO3, according to the structure-property relationship between the stability of alkaline thiourea and the structure of thiourea
and sulfite ion, and the effect of the stable reagents on stability of alkaline thiourea was investigated. The results show
that contrary to Na2SeO3, Na2SO3 and Na2SiO3 affect the stability of alkaline thiourea solution remarkably. The stable effect of Na2SiO3 on alkaline thiourea is obviously better than that of Na2SO3. The stable reagents Na2SO3 and Na2SiO3 decrease the decomposition rate of alkaline thiourea solution greatly, and the decomposition rate of alkaline thiourea reduces
from 72.5% to 33.8% with addition of 0.3 mol · L−1 Na2SiO3. Dissolution currents of gold in the alkaline thiourea solution containing Na2SO3 and Na2SiO3 are 2.0 mA · cm−2 and 3.5 mA · cm−2 at the potential of 0.42 V, respectively, and Na2SO3 is consumed excessively due to the oxidation reaction of Na2SO3 occurring in the studied potential range. Na2SiO3 is an efficient stable reagent of alkaline thiourea solution, and gold dissolution is accelerated much more obviously by
Na2SiO3 than by Na2SO3.
Foundation item: Project(50004009) supported by the National Natural Science Foundation of China |
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| Keywords: | alkaline thiourea gold leaching stable reagent Na_2SiO_3 Na_2SO_3 Na_2SeO_3 |
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