Electrochemical Aspects of Silver Sulfosalts Dissolution in Acid Thiourea Solution

2019 ◽  
Vol 36 (1) ◽  
pp. 491-500 ◽  
Author(s):  
Angel M. Meléndez ◽  
Ignacio González ◽  
Rubén Arroyo
Keyword(s):  
Thiourea Solution

Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching

2003 ◽  
Vol 10 (4) ◽  
pp. 292-296 ◽  
Author(s):  
Yun-yan Wang ◽  
Li-yuan Chai ◽  
Xiao-bo Min ◽  
De-wen He ◽  
Bing Peng
Keyword(s):  
Gold Leaching ◽  
Alkaline Thiourea ◽  
Thiourea Solution ◽  
Stable Reagent

An Electrochemical and in situ SERS Study of Au Electrodeposition from a Thiourea Solution

2003 ◽  
Vol 81 (3) ◽  
pp. 75-78 ◽  
Author(s):  
Ameriga Fanigliulo ◽  
Claudio Mele ◽  
Benedetto Bozzini
Keyword(s):  
Thiourea Solution

scholarly journals Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1216
Author(s):  
Rui Xu ◽  
Qian Li ◽  
Feiyu Meng ◽  
Yongbin Yang ◽  
Bin Xu ◽  
...  
Keyword(s):  
Mixed Culture ◽  
Active Sites ◽  
Gold Recovery ◽  
Ftir Analysis ◽  
Gold Extraction ◽  
Gold Ores ◽  
Gold Ore ◽  
Thiourea Solution ◽  
Refractory Gold ◽  
Pure Cultures

Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing A. ferrooxidans and L. ferrooxidans was investigated. The results showed that direct thiourea leaching of the as-received DRGO yielded only 28.7% gold extraction, which was due to the encapsulation of sulfides on gold and the gold adsorption of CM. After bio-oxidation, thiourea leaching of the DRGO resulted in gold extraction of over 75–80%. Moreover, bio-oxidation can effectively reduce the adsorption of carbon to gold. XRD, SEM-EDS and FTIR analysis showed that many oxygen-containing groups were introduced on the surface of DRGO during bio-oxidation, while the C=C bond was cleaved and the O–C–O and C–N bonds were degraded, causing a decrease in active sites for gold adsorption. Moreover, passivation materials such as jarosite were formed on the surface of DRGO, which might reduce the affinity of CM for gold in solutions. In addition, the cleavage of the S–S band indicated that sulfides were oxidized by bacteria. This work allows us to explain the applicability of pre-bio-oxidation for degrading both sulfides and CM and increasing gold recovery from DRGO in the thiourea system.

Electroless Silver Plating Process on Al-Ag Alloy Powder

2013 ◽  
Vol 800 ◽  
pp. 256-259
Author(s):  
Wang Qun ◽  
Ye Fan Li ◽  
Dong Mei Li ◽  
Zhi Xue Qu
Keyword(s):  
Electroless Plating ◽  
Alloy Powder ◽  
Glucose Solution ◽  
Silver Content ◽  
Silver Coating ◽  
Chemical Compositions ◽  
Composite Powders ◽  
Plating Bath ◽  
Thiourea Solution ◽  
Electroless Silver Plating

The Ag coating was deposited on the surface of Al-Ag alloy powder by electroless plating process. 10 wt% of AgNO3 was put in the powder for precursor replacement reaction, and then added the powder into electroless plating bath which contained glucose solution, solution of silver ammonia, thiourea solution, tartaric acid solution and absolute ethanol. The effects of formula components were analyzed. The surface morphology of the prepared composite particles was studied with SEM and their chemical compositions were confirmed by XRD. With the chemical etching method, silver content of the powder was determined. The studies have shown that an uniform, complete and dense silver coating for the Al-Ag composite powders was generated by this method, with the silver content being 20wt%, and the conductivity was favorable.

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