Technology and equipment for hydrometallurgical oxidation of refractory gold-bearing concentrates (ES-process)

Sudakov, D. V.; Chelnokov, S. Yu.; Rusalev, R.E.; Elshin, A. N.

doi:10.17580/tsm.2017.03.06

Cited by 6 publications

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“…Reaction (11) represented the predominant reaction during the oxidation of pyrite. This reaction occurred rapidly at temperatures exceeding 60 °C and pH values below 1.7 [ 37 ]. When the concentration of nitric acid was high (above 50 g/L), a small quantity of elemental sulfur was formed even at relatively low temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Rusalev¹,

Rogozhnikov

Dizer

et al. 2023

Materials

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An integrated two-stage metallurgical process has been developed to process concentrates from the Olimpiadinskoe deposit, which contain high levels of antimony and arsenic. The optimal parameters for the alkaline sulfide leaching process of the initial concentrate from the Olimpiadinskoe deposit were determined to achieve the maximum extraction of antimony at a 99% level. The recommended parameters include an L:S ratio of 4.5:1, a sodium sulfide concentration of 61 g/L, a sodium hydroxide concentration of 16.5 g/L, a duration of 3 h, and a temperature of 50 °C. A synergistic effect of co-processing alkaline sulfide leach cakes with sulfuric and nitric acids was observed. The pre-treatment step reduced the nitric acid composition by converting carbonates into gypsum and increased the arsenic extraction by 15% during subsequent nitric acid leaching. The laboratory research on the nitric acid leaching of decarbonized cake established the key parameters for the maximum iron and arsenic extraction in solution (92% and 98%, respectively), including an L:S ratio of 9:1, a nitric acid concentration of 6 mol/L, and a time of 90 min. Full polynomial equations for the iron and arsenic extraction from the decarbonized cake were derived. The model demonstrated a high relevance, as evidenced by the determination coefficients (R2) of 96.7% for iron and 93.2% for arsenic. The technology also achieved a high gold recovery rate of 95% from the two-stage alkaline sulfide and nitric acid leach cake. Furthermore, the maximum deposition of arsenic from the nitrate leach solution in the form of insoluble As2S3 was determined to be 99.9%. A basic technological flow sheet diagram for processing the flotation gold–antimony concentrate from the Olimpiadinskoe deposit was developed, including two stages: the production of metallic antimony and the gold extraction from the nitric leach cake.

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Section: Resultsmentioning

confidence: 99%

“…In this process, the sulfide material is treated with a solution containing nitric and/or nitrogen oxides (NSC) [ 35 , 36 ]. The exothermic reaction generates heat, thereby enhancing the oxidation process [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Rusalev¹,

Rogozhnikov

Dizer

et al. 2023

Materials

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show abstract

“…Reaction (11) represented the predominant reaction during the oxidation of pyrite. This reaction occurred rapidly at temperatures exceeding 60 • C and pH values below 1.7 [37]. When the concentration of nitric acid was high (above 50 g/L), a small quantity of elemental sulfur was formed even at relatively low temperatures.…”

Section: Thermodynamic Analysis Of Nitric Acid Leachingmentioning

confidence: 99%

Development of a Two- Stage Hydrometallurgical Technology for Processing Gold-Antimony Concentrate from the Olimpiadinskoe Deposit

Rusalev¹,

Rogozhnikov²,

Dizer³

et al. 2023

Preprint

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An integrated two-stage metallurgical technology has been developed for processing concentrates from the Olimpiadinskoe deposit with high antimony and arsenic content. The parameters of the alkaline sulphide leaching process of the initial concentrate of the Olimpiadinskoe deposit, providing maximum extraction of antimony in solution at 99% level have been recommended. The L:S ratio = 4,5:1; the concentration of sodium sulphide - 61 g/L; the concentration of sodium-hydroxide – 6,5 g/L; the duration – 3 hours; the temperature – 50 °C. A synergistic effect of alkaline sulphide leach cakes co-processing by sulphuric and nitric acids has been determined. Pre-treatment allows to reduce the composition of nitric acid by converting the carbonates into gypsum and increases the extraction of arsenic by 15 % at the following nitric leaching. Laboratory research of nitric acid leaching of decarbonized cake allowed to set the basic parameters for maximum iron and arsenic extraction in solution (92 and 98 %): the L:S ratio =9:1; the concentration of nitric acid – 6 mol/L; the time – 90 min. The full polynomial equations for iron and arsenic extraction from decarbonised cake have been derived. The model is relevant since the value the determination coefficients for iron and arsenic R2 were 96,7 and 93,2 %. The high value of gold recovery from the cake of two-stage alkaline sulphide and nitric acid leach cake at 95 % has been established. The maximum value of arsenic deposition from the nitrate leach solution in the form of the insoluble deposition As2S3 99,9 %. A basic technological flowsheet diagram for flotation gold-antimony processing for the Olimpiadinskoe deposit has been developed; it includes two redistributions: production of metallic antimony and gold extraction from the nitric leach cake.

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“…The investigated optimal parameters for alkaline sulfide leaching are shown in Table 4. Due to the fact that most of the gold is enclosed in the structure of pyrite and arsenopyrite [10], antimony free material needs to be pretreated by hydrometallurgical oxidation operations with following cyanidation [15][16][17].…”

Section: Fig 4 Comparison Of Theoretical and Experimental Valuesmentioning

confidence: 99%

Optimization of Alkaline Sulfide Leaching of Gold-Antimony Concentrates

Rusalev

Rogozhnikov

Koblik

2020

MSF

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This article covers a hydrometallurgical method for processing of a gold-antimony flotation concentrate in alkaline sulfide solutions. Thermodynamic analysis of the reaction stibnite with sulfide sodium and sodium hydroxide was performed. The chemical and phase compositions of the investigated material, mainly represented by compounds of antimony, silicon, calcium, sulfur and iron are studied. Phase composition: quartz, stibnite, quicklime, pyrite, dolomite and arsenopyrite. The dependences of the influence of sulfide sodium and sodium hydroxide concentration, and the liquid to solid ratio on antimony extraction into solution were determined by methods of mathematical experiment planning. The calculated values of the determination coefficients testify to the adequacy of the chosen two-level model. The optimum parameters of the process were obtained: L/S ratio = 4,5; the nitric acid sulfide sodium concentration was 61.09 g/L; sodium hydroxide concentration was 16.47 g/

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Technology and equipment for hydrometallurgical oxidation of refractory gold-bearing concentrates (ES-process)

Cited by 6 publications

References 0 publications

Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Development of a Two- Stage Hydrometallurgical Technology for Processing Gold-Antimony Concentrate from the Olimpiadinskoe Deposit

Optimization of Alkaline Sulfide Leaching of Gold-Antimony Concentrates

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