Copper Smelting Fine Dust Autoclave Leaching

Kovyazin, A. A.; Тимофеев, К. Л.; Krauhin, Sergey

doi:10.4028/www.scientific.net/msf.946.615

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…To obtain the optimal parameters of nitric acid leaching, mathematical planning of the experiment was used. StatGraphics 16 was used to construct a second-order orthogonal matrix with five variable parameters: the temperature was 65-95 • C, the nitric acid concentration was 3-8 mol/dm 3 , the concentration of Fe (III) ions was 5-20 g/dm 3 , the mass ratio FeS 2 to the mixture of sulfides was (0.5-2:1), the time was 15-60 min.…”

Section: Methodsmentioning

confidence: 99%

“…The combined use of these additives had the greatest positive effect on the process, com- To determine the influence of FeS2 and Fe (III) ions, the experiments were carried out. The parameters of the experiments were as follows: the concentration of nitric acid was 6 mol/dm 3 , the time was 60 min, the temperature was 80 °C, the concentration of Fe (III) ions was 5 g/dm 3 . FeS2 was added in mass ratio of 1:1 (to the total mass of sulfide minerals).…”

Section: Determination Of Optimal Parameters Of Nitric Acid Leachingmentioning

confidence: 99%

“…To obtain optimal parameters of nitric acid leaching, experiment mathematical planning was used [50,51]. StatGraphics software was used to construct a second-order orthogonal matrix with five variable parameters: the temperature was 65-95 • C, the acid concentration was 3-8 mol/dm 3 , the concentration of Fe (III) ions was 5-20 g/dm 3 , the mass ratio FeS 2 to the mass of the sulfides mixture was (0.5-2:1), the time was 15-60 min, Materials 2022, 15, 1545 9 of 16 the liquid-to-solid ratio (L:S) was 6:1. The results of the variance analysis are presented in Table 5.…”

Section: Determination Of Optimal Parameters Of Nitric Acid Leachingmentioning

confidence: 99%

“…The presence of arsenic in copper concentrates prevents their processing using traditional technologies. During pyrometallurgical processes, arsenic dust is formed [2][3][4][5][6][7][8][9][10][11][12][13]. It presents a significant danger to humans and the environment [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Nitric Acid Dissolution of Tennantite, Chalcopyrite and Sphalerite in the Presence of Fe (III) Ions and FeS2

et al. 2022

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This paper describes the nitric acid dissolution process of natural minerals such as tennantite, chalcopyrite and sphalerite, with the addition of Fe (III) ions and FeS2. These minerals are typical for the ores of the Ural deposits. The effect of temperature, nitric acid concentration, time, additions of Fe (III) ions and FeS2 was studied. The highest dissolution degree of sulfide minerals (more than 90%) was observed at a nitric acid concentration of 6 mol/dm3, an experiment time of 60 min, a temperature of 80 °C, a concentration of Fe (III) ions of 16.5 g/dm3, and an addition of FeS2 to the total mass minerals at 1.2:1 ratio. The most significant factors in the break-down of minerals were the nitric acid concentration, the concentration of Fe (III) ions and the amount of FeS2. Simultaneous addition of Fe (III) ions and FeS2 had the greatest effect on the leaching process. It was also established that FeS2 can be an alternative catalytic surface for copper sulfide minerals during nitric acid leaching. This helps to reduce the influence of the passivation layer of elemental sulfur due to the galvanic linkage formed between the minerals, which was confirmed by SEM-EDX.

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Section: Methodsmentioning

confidence: 99%

Section: Determination Of Optimal Parameters Of Nitric Acid Leachingmentioning

confidence: 99%

Section: Determination Of Optimal Parameters Of Nitric Acid Leachingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitric Acid Dissolution of Tennantite, Chalcopyrite and Sphalerite in the Presence of Fe (III) Ions and FeS2

et al. 2022

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“…The current technologies for processing copper concentrates are mainly pyrometallurgical, resulting in the formation of a large amount of waste gases and dusts. Recycling of metallurgical dusts consists in extracting valuable components in the form of individual products, as well as in obtaining low-toxic compounds from harmful impurities [3][4][5][6][7][8][9][10]. Arsenic is a harmful impurity contained in recovered non-ferrous metals, which determines the importance of its removal from technological processes [11].…”

Section: Introductionmentioning

confidence: 99%

Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System

Karimov

Rogozhnikov

Dizer

et al. 2021

Metals

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The processing of low-grade polymetallic materials, such as copper–zinc, copper–lead–zinc, and poor arsenic-containing copper concentrates using hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in ores. Ferric arsenates obtained through hydrothermal precipitation are the least soluble and most stable form of arsenic, which is essential for its disposal. This paper describes the investigation of the oxidation kinetics of As (III) ions to As (V) which is required for efficient purification of the resulting solutions and precipitation of low-solubility ferric arsenates. The effect of temperature (160–200 °C), the initial concentration of Fe (II) (3.6–89.5 mmol/dm3), Cu (II) (6.3–62.9 of mmol/dm3) and the oxygen pressure (0.2–0.5 MPa) on the oxidation efficiency of As (III) to As (V) was studied. As (III) oxidation in H3AsO-Fe2+-Cu2+-H2SO4 and H3AsO-Fe2+-H2SO4 systems was controlled by a chemical reaction with the apparent activation energy (Ea (≈84.3–86.3 kJ/mol)). The increase in the concentration of Fe (II) ions and addition of an external catalyst (Cu (II) ions) both have a positive effect on the process. When Cu (II) ions are introduced into the solution, their catalytic effect is confirmed by a decrease in the partial orders, Fe (II) ions concentration from 0.43 to 0.20, and the oxygen pressure from 0.95 to 0.69. The revealed catalytic effect is associated with a positive effect of Cu (II) ions on the oxidation of Fe (II) to Fe (III) ions, which further participate in As (III) oxidation. The semi-empirical equations describing the reaction rate under the studied conditions are written.

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