Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation and thiourea leaching

Murthy, D. S. Ramachandra; Kumar, Vinod; Rao, K. V. S. Rama

doi:10.1016/s0304-386x(02)00197-4

Cited by 50 publications

(14 citation statements)

References 5 publications

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“…Clearly, considerable amount of gold-containing species on the BPC after adsorption Figure 6(a) were removed after 2M HCl -0.7 M thiourea treatment Figure 6(b). As known, the adsorbed gold ion was already reduced to gold and the gold could be resolved in acidic solutions of thiourea in the presence of oxidant according to Murthy [26]. The results indicated that the adsorbent material can be successfully recovered.…”

Section: Gold Recovery and Adsorbent Regenerationmentioning

confidence: 81%

Banana Peel Carbon that Containing Functional Groups Applied to the Selective Adsorption of Au(III) from Waste Printed Circuit Boards

Zheng¹,

Wang²

2013

SNL

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This paper reports a kind of banana peel carbon (BPC) containing -OH, -NH₂ functional groups which prepared through controlling carbonization temperature and its application on the selective adsorption of gold from waste printed circuit boards (PCBs). The adsorption of BPC for Au(III) reached equilibrium in 30 min and the adsorption of Au(III) was favorable at pH 2.5. Meanwhile, the adsorption isotherm showed the maximum adsorption capacity of 801.7 mg/g for Au(III). The results displayed that BPC had a strong selectivity for Au(III) and a negligible affinity to base metal ions, such as Cu(II), Ni(II), Fe(III) and Pb(II). The BPC adsorbent, which absorbed gold, can be recovered completely by HCl-thiourea solution.

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Section: Gold Recovery and Adsorbent Regenerationmentioning

confidence: 81%

Banana Peel Carbon that Containing Functional Groups Applied to the Selective Adsorption of Au(III) from Waste Printed Circuit Boards

Zheng¹,

Wang²

2013

SNL

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“…Cyanide leaching is a traditional and methodically developed process, which is effective for extracting gold from refractory ores [30]. However, cyanide has gradually been replaced by other lixiviants such as glycine and thiourea because of its strong toxicity and serious environmental damage [31][32][33]. Nowadays, more and more new biological approaches are being studied to recover gold from refractory gold-bearing sulfide ore [5,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

et al. 2019

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The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum. The gold grade in the mineral was 15.96 g/t and the particle size distribution of gold was extremely uneven. Most of the gold particles were less than 10 μm and wrapped with gold-bearing minerals, making it difficult to achieve liberation during grinding. According to the characteristics of the refractory gold deposit, the gravity–flotation combined beneficiation process was used to recover the liberated coarse gold and the fine gold in the sulphides. The closed-circuit experiments obtained excellent indicators. The grade and recovery of gold in the gravity separation concentrates reached 91.24 g/t and 57.58%, respectively. The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.

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“…Cyanidation has become the most popular method of gold and silver recycling from mineral resources because of the simplicity and economical reasons for more than a century (Wei et al, [1]; Yang et al, [2]- [4]). Being toxic and environmental restrictions may increase using of new reagents such as halogens (Gurung et al, [5]), thiocyanide (Kholmogorov et al, [6]), thiosulfate (Abbruzzese et al, [7]; Ficeriová et al, [8]; Hiskey and Atluri, [9]) and thiourea are alternatives (Çelik, [10]; Chen et al, [11]; De Andrade Lima and Hodouin, [12]; Ficeriová et al, [13]; Hilson and Monhemius, [14]; Kononova et al, [15]; Lacoste et al, [16]; Li and Miller, [17]; Muir and Aylmore, [18]; Muñoz and Miller, [19]; Murthy, [20] [21]). Some of these methods are not only ecofriendly but also their leaching rates are higher than the conventional cyanidation method (Chen et al, [11]; Ficeriová et al, [16]; Agma et al, [22]; Groenewald, [23]).…”

Section: Introductionmentioning

confidence: 99%

“…Thiourea leaching is done in acidic medium. If ferric ion used as an oxidizing agent in the following reaction occurs in solution (Gurung et al, [5]; Murthy et al, [21]; Kai et al [27]; Almeidaand Amarante, [35]; Gonen et al, [36]; Jing-ying et al, [37]; Li et al, [38]; Ubaldini et al, [39]):…”

Section: Introductionmentioning

confidence: 99%

Investigate of Effective Factors on Extraction of Silver from Tailings of Lead Flotation Plant Using Thiourea Leaching

Masoud¹,

Amir²,

Rezai³

2016

WJET

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In current paper, the effect of different factors on extraction of silver from tailings of lead flotation plant using thiourea leaching was studied. According to the mineralogical studies and chemical analysis taken from the tailings dam, the representative sample taken from there contained 30 ppm Ag and the minerals such as calcite, dolomite, barite, microcline, galena etc. In this research, the effects of iron(III) sulfate concentration, thiourea concentration, size and temperature onextraction of silver from Ravanj flotation plant tailings were analyzed using statistics design of experiment and DX7 software; and it was determined that iron(III) sulfate concentration and temperature were the most effective factors on the extraction of silver. The results showed that the best recovery obtained in particle size of 75 microns, 1 kg/m 3 thiourea concentration and 1 kg/m 3 iron(III) sulfate concentration in the temperature of 60˚C for 2 hours.

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Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation and thiourea leaching

Cited by 50 publications

References 5 publications

Banana Peel Carbon that Containing Functional Groups Applied to the Selective Adsorption of Au(III) from Waste Printed Circuit Boards

Banana Peel Carbon that Containing Functional Groups Applied to the Selective Adsorption of Au(III) from Waste Printed Circuit Boards

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

Investigate of Effective Factors on Extraction of Silver from Tailings of Lead Flotation Plant Using Thiourea Leaching

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