A comprehensive approach to the recovery of gold from the technogenic objects of gold mining industry of the Russian Federation Far East

Ivannikov, S. I.; Эпов, Д. Г.; Крысенко, Г. Ф.; Medkov, M. A.; Bratskaya, Svetlana; Yudakov, A. A.

doi:10.2205/2013nz000115

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…The efficiency of gold recovery from model systems within 2 hours of contact with the ammonia-thiosulfate solution exceeded 90% already at a ratio of T:F 1:1. Application of these leaching conditions to real samples of gold-containing silicate and aluminosilicate samples provided high efficiency of gold recovery (78-97%) [11].…”

Section: Resultsmentioning

confidence: 99%

“…What can be associated with a decrease in the stability of the ammonia-thiosulfate system in the presence of transition metal oxides catalyzing the oxidation decomposition of thiosulfates and the formation of tetrathionates [12,13]. Additional studies show that in the presence of magnetite, the dissolution rate of gold by the ammonia-thiosulphate solution of the optimized composition drops sharply [11]. Thus, the significant content of magnetite and titanomagnetite in this technogenic raw material is a factor that reduces the effectiveness of the use of ammonium-thiosulfate solutions for gold leaching.…”

Section: Fig1 Kinetic Of the Gold Content In The Ammonia-thiosulphamentioning

confidence: 99%

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Beneficiation and hydrometallurgical processing of gold-containing sludge

et al. 2018

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The research results of technogenic objects in the Far East of Russia, in particular, the silt of the settling pond "Chalgany" and the waste of the Chalganov kaolin plant are given. The presence of valuable components in the investigated objects is shown, in particular: gold, noble metals, rare earth elements. It is established that gold in the investigated objects is represented mainly by a difficult-to-extract finely dispersed class of fineness (<5 μm). The methods of preliminary concentration and hydrometallurgical processing, which allow extracting gold from the studied technogenic objects, are proposed. The effectiveness of noncyanide methods of ammonia-thiosulphate and thiocarbamide leaching was investigated. It is shown, that the efficiency of gold recovery from the silt of the settling pond “Chalgany” by the thiocarbamide method reaches 93.5%. It is established that the waste from the Chalganovskiy kaolin plant, after recovering the concentrate of precious metals from them, can serve as a raw material for the production of chemically pure silicon and silica, as well as aluminum, its compounds, and refractory fibrous materials.

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Section: Resultsmentioning

confidence: 99%

Section: Fig1 Kinetic Of the Gold Content In The Ammonia-thiosulphamentioning

confidence: 99%

Beneficiation and hydrometallurgical processing of gold-containing sludge

et al. 2018

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A technology for gold extraction from tailings resulting from polymetallic ore beneficiation

Vasilkova,

Byvaltsev,

Khmelnitskaya

et al. 2024

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We propose a technology for processing of copper-zinc ore flotation tailings with the purpose of extracting gold using ultra-low (10–30 mg/dm3 ) concentrations of NaCN. The material composition of the starting materials was examined using the methods of inductively coupled plasma, gold assay atomic absorption and X-ray diffraction analysis. The NaCN concentration in solution was determined by titrimetric and photometric methods; pH levels were determined by potentiometric analysis. The laboratory studies established optimal conditions for cyanidation of tailings resulting from flotation beneficiation of copper-zinc ores, which underwent preliminary lime treatment: mass fraction of the 0.071-mm mesh minus – 70.5%; duration – 8 h; NaCN consumption – 0.3 kg/t (at a concentration of 30 mg/dm3 ); L:S =1:1. Under these conditions, the gold extraction rate amounted to 32.0–33.6%. Pre-grinding of flotation tailings to the size of 90% of the 30 mm mesh minus led to an increase in gold extraction of up to 41.5–44.7% at an NaCN consumption of 0.6 kg/t of the same concentration and L:S =1.5:1. The results obtained served as the basis for experimental cyanidation of waste tailings according to two schemes, i.e., using tailings of initial coarseness and pre-ground tailings. A good agreement was achieved between the laboratory and experimental results. At present, the use of pre-ground tailings seems unreasonable economically, due to high costs of NaCN (0.6 kg/t vs 0.3 kg/t) and active chlorine (5.6 kg/t vs 1.2 kg/t). According to pilot tests on a flotation tailing sample weighing 67 t (with an Au content of 1.35 g/t), the gold extraction level was 31.9% at an NaCN consumption rate of 0.135 kg/t. As a result, we propose a technology of gold extraction from flotation tailings of copper-zinc ore based on the application of ultra-low concentrations of NaCN. The expected profit can amount to 1276.74 mln RUB per year, with the economic efficiency of 88% and the payback period of 1.4 years).

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A comprehensive approach to the recovery of gold from the technogenic objects of gold mining industry of the Russian Federation Far East

Cited by 2 publications

References 5 publications

Beneficiation and hydrometallurgical processing of gold-containing sludge

Beneficiation and hydrometallurgical processing of gold-containing sludge

A technology for gold extraction from tailings resulting from polymetallic ore beneficiation

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