Enhanced leachability of gold and silver in cyanide media: Effect of alkaline pre-treatment of jarosite minerals

Kasaini, Henry; Kasongo, K.; Naude, Natasia; Katabua, J.

doi:10.1016/j.mineng.2007.12.005

Cited by 23 publications

(5 citation statements)

References 10 publications

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“…It is in agreement with the results reported earlier. 24,25) When the NaCN concentration is 18 kg/t, the obtained highest leaching ratio is 80.7% after ultrasound leached for 5 h.…”

Section: Effect Of Nacn Concentration On the Leaching Ratiomentioning

confidence: 95%

Ultrasound-intensified Leaching of Gold from a Refractory Ore

et al. 2016

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The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated. Firstly, the refractory ore was pretreated with sodium hydroxide under ultrasound. Secondly, the pretreated ore was leached under ultrasound. The leaching ratio of gold decreased with increasing of the ultrasound pretreatment time from 1 to 5 h and the NaOH concentration from 5 to 20 wt%. The ultrasound increased remarkably the leaching ratio of gold when the pretreated ore was subjected to ultrasound leaching. The results showed that the appropriate acoustic power was a requirement during the ultrasound-intensified leaching. The leaching ratio of gold increased with an increasing of NaCN concentration from 6 to 18 kg/t. The results demonstrated that the ultrasound is a viable extractive metallurgy technique in pretreatment and leaching for the refractory gold ores.

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“…It is in agreement with the results reported earlier. 24,25) When the NaCN concentration is 18 kg/t, the obtained highest leaching ratio is 80.7% after ultrasound leached for 5 h.…”

Section: Effect Of Nacn Concentration On the Leaching Ratiomentioning

confidence: 95%

Ultrasound-intensified Leaching of Gold from a Refractory Ore

et al. 2016

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“…∆G°3 0°C = -21.67 kJ (13) The formation of thiocyanate was checked by contacting 10 grams of S° in a 0.06 M solution of NaCN, subsequently detecting the formation of sodium thiocyanate through the Alpha method 4500 CN -M. Thiocyanate.…”

Section: S°+cn -→Cns -mentioning

confidence: 99%

“…In the case of residues composed of jarosite, some researchers have focused on conducting tests to stabilize the residue [6] and others in recovering valuable metals [7][8][9][10]; However, the stability of the jarosite hinders the recovery of the silver by the standard leaching method and a decomposition process must be applied before the leaching of this type of materials [11]. Some researchers have proposed two types of decay processes of jarosite: hydrothermal decomposition (acidic or alkaline) [12,13] and thermal decomposition [14,15].…”

Section: Introductionmentioning

confidence: 99%

Sº and jarosite behavior during recovery of values from the direct leaching residue of sphalerite using cyanide and glycine

Rodríguez

Pedroza

Martínez

et al. 2021

J min metall B Metall

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This paper reports the effect of the components of a direct leaching residue (jarosite and elemental sulfur), on the recovery of valuable metals such as gold and silver. Leaching media such as cyanide and mixtures of cyanide with glycine were used to recover the gold and silver from the residue; however, a low recovery of these metals was obtained. The above due to the negative effect of its components which cause problems in the extraction process such as encapsulation of silver (due to jarosite) and the formation of thiocyanate and re-precipitation of silver (due to sulfur). Various treatments prior to leaching were tested, finding that when the residue is desulfurized with perchlorethylene and subjected to an oxidizing alkaline hydrothermal treatment, the gold extraction increased from 39.73 to 88% and the silver extraction of 64.76 to 94.29%. Additionally, it was determined that when cyanide is assisted by glycine, the latter decreases the cyanide consumption by inhibition of the dissolution of iron and sulfur in cyanide.

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“…Two types of jarosite decomposition processes are reported: the thermal decomposition and the hydrothermal (alkaline or acid) decomposition [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The acid decomposition proposes the jarosite decomposition with heat (90°C to 250°C), and, in some cases, pressure; and promotes the formation of sulfate species soluble in acid media (Eq.…”

Section: Jarosite Decompositionmentioning

confidence: 99%