The aqueous recovery of gold from electronic scrap

Kulandaisamy, S.; Rethinaraj, J. Prabhakar; Adaikkalam, P.; Srinivasan, G.; Raghavan, M.

doi:10.1007/s11837-003-0102-2

Cited by 30 publications

(13 citation statements)

References 28 publications

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“…The EWM mass comprised of metals (32%), refractory oxides, ceramics and plastics. Similar results were reported in previous studies [1,17,18,19,20,21]. Untreated EWM contained mostly copper, base metals such as zinc, iron, lead and aluminium in significant proportions, and in lower concentration, gold, silver and other metals.…”

Section: Bioleaching Studiessupporting

confidence: 90%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

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Technology of biorecovery by Bacillus megaterium to obtain gold as a complex of gold-cyanide from electronic waste material (EWM) was done. The bacteria were subjected to pretreatment and mutation. The exist metals in solution were dissolved via the pretreatment, that way, contest for the cyanide ion from other metals was reduced. The bacteria were subjected to mutation to be able grow at pH 9, 9.5 and 10, where the pKa of HCN is 9.3, thereby, the cyanide ion concentration available for bioleaching was increased by alkaline pH. The new mutated bacteria from the pretreated EWM at 0.5% pulp density obtained gold of 17, 25 and 21% at pH 9, 9.5 and 10, respectively. Whereas the old unmutated bacteria that grow at pH 7, recovered 11%. The outcomes demonstrated that effectiveness of the mutated alkaline bacteria (B. megaterium) in gold biorecovery was more than normal physiological (pH 7).

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Section: Bioleaching Studiessupporting

confidence: 90%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

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“…In the early stages, cyanide was used for a long time to recover gold [154]. However, as use of cyanide is fairly toxic [155], research has been focused on the development of alternative methods to solve the gold.…”

Section: Printed Circuit Boardmentioning

confidence: 99%

E-waste: A Review of CRT (Cathode Ray Tube) Recycling

Ciftci¹,

Çiçek²

2017

Res. Rev. J Mat. Sci

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The developments in monitor technology have accelerated in recent years, acquiring a new dimension. The use of liquid crystal display (LCD) and light emitting diode (LED) monitors has rapidly reduced the use of cathode ray tube (CRT) technology in computers and televisions (TVs). As a result, such devices have accumulated as electronic waste and constitute a new problem. Large parts of electronic waste can be recycled for reuse. However, some types of waste, such as CRT TVs and computer monitors, form hazardous waste piles due to the toxic components (lead, barium, strontium) they contain. CRT monitors contain different types of glass constructions and they can therefore be recycled. However, the toxic substances they contain prevent them from being transformed into glass for everyday use. Furthermore, because CRT technology is obsolete, it is not profitable to use CRT as a raw material again. For this reason, poisonous components in glass ceramic structures found in CRT monitors can be confined and used in closed-loop recycling for various sectors.

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“…그러나 염소를 이용한 금 용출은 현장(in situ) 에서 염소 가스가 발생하므로 신체 접촉을 피해야한다 (Hilson and Monhemius, 2006). 염소-차아염소산은 금 표면에 피막(passivation)이 형성되지 않기 때문에 정광으 로부터 Au와 Ag 용출 (Jeffrey et al, 2001;Baghalha, 2007), 폐 전자제품으로부터 Au, Sb, Sn 등의 용출 (Saleh et al, 2001;Kulandaisamy et al, 2003) 그리고 양 극 슬라임(anode slime)으로부터 Au 용출 (Donmez et al, 1999;Bard and Sobral, 2008) (Coderre and Dixon, 1999;Wan and LeVier, 2003;Kozin and Melekhin, 2004 (Robinson, 1988;Dunn and Chamberlain, 1997). 이들 소성정광(1.6 g) 을 염소-차아염소산 용출용액(염산: 차아염소산나트륨 =1.5:1)에 첨가시켜 30분 동안 용출실험을 수행하였다 (Fig.…”

Section: 염소(Cl)는 강력한 산화 능력을 갖고 있기 때문에unclassified

Optimization of Gold Leaching from the Refractory Sulfide Concentrate by HCl-NaClO-FeCl₃Solution

Kim¹,

Cho²,

Lee³

et al. 2013

Economic and Environmental Geology

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In order to optimize gold leaching from refractory sulfide concentrate, a HCl-NaClO-FeCl 3 solution with varying attributes was applied to the roasted concentrate from Uil mine. The gold from Uil mine occurs in the form of invisible gold that is difficult to leach. The results of the gold leaching experiments showed that the best gold leaching parameters were 550 o C of roasting temperature, 2.0 M of concentration, 1.0% of pulp density, and 70 o C of leaching temperature. It is confirmed that the HCl-NaClO-FeCl 3 solution was an environmentally friendly method to leach gold and silver from the refractory sulfide concentrate as an alternative lixiviant to cyanide.

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The aqueous recovery of gold from electronic scrap

Cited by 30 publications

References 28 publications

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

E-waste: A Review of CRT (Cathode Ray Tube) Recycling

Optimization of Gold Leaching from the Refractory Sulfide Concentrate by HCl-NaClO-FeCl₃Solution

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The aqueous recovery of gold from electronic scrap

Cited by 30 publications

References 28 publications

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

E-waste: A Review of CRT (Cathode Ray Tube) Recycling

Optimization of Gold Leaching from the Refractory Sulfide Concentrate by HCl-NaClO-FeCl3Solution

Contact Info

Product

Resources

About

Optimization of Gold Leaching from the Refractory Sulfide Concentrate by HCl-NaClO-FeCl₃Solution