Investigation of Cu, Pb, Zn, As, Sb distribution during the lead semiproducts and copper-zinc concentrate comelting

Dosmukhamedov, N. K.; Zholdasbay, E. E.; Argyn, A.A.; Федоров, А. Н.

doi:10.17580/nfm.2020.01.02

Cited by 5 publications

(3 citation statements)

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“…The chemical composition of fine dust from the copper smelting industry depends mainly on the smelting process conditions and the type and composition of the concentrate. Minor deviations of the furnace operating modes, the chemical composition of the concentrate and other factors from the specified parameters can lead to changes in the metal content in the dust [11][12][13][14][15][16]. Dust from copper smelters is characterized by a heterogeneity of particle size, chemical and mineralogical composition [17][18][19], which must be taken into account when choosing a technology for processing the dust of a specific composition.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Pb, Cu, Zn and As from Fine Dust of Copper Smelting Industry via Leaching with Sulfuric Acid

Dosmukhamedov,

Zholdasbay,

Argyn

2023

Sustainability

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Fine dust from copper smelting plants is an important source of raw materials for the extraction of various valuable metals. A specific feature of dust from copper smelting plants in Kazakhstan is their high arsenic content of up to 15%. This work shows the possibility of hydrometallurgical processing of fine dust from copper smelters, obtained during the converting of copper mattes through the Vanyukov process, via direct leaching with sulfuric acid. The influence of temperature, process time and the S:L (solid/liquid) ratio on the selective extraction of Pb, Zn, Cu and As into targeted products under leaching conditions is studied. The results of the test work show that with the optimal process parameters of S:L = 1.5, t = 60 °C, τ = 60 min, the extraction of copper and zinc into solution is achieved as 89% and 96%, respectively, and lead into cake by up to 97%. The relatively low extraction of copper and zinc into the solution is explained by the transition of copper and zinc ferrites that are insoluble in sulfuric acid into the lead cake. The redistribution of arsenic between the leaching products established in this case also affects the reduction in copper and zinc in the solution. The extraction of arsenic into the solution is 49.32%. More than half of the arsenic from the dust is left in the lead cake. The concentration of arsenic in lead cake will lead to its transition into circulating dust during smelting. This will increase the accumulation of arsenic in the overall process flow. Therefore, when organizing dust-processing technology, it is necessary to provide measures for the preliminary removal of arsenic.

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Section: Introductionmentioning

confidence: 99%

Extraction of Pb, Cu, Zn and As from Fine Dust of Copper Smelting Industry via Leaching with Sulfuric Acid

Dosmukhamedov,

Zholdasbay,

Argyn

2023

Sustainability

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“…The results of systematic studies of the theoretical features of the interaction of non-stoichiometric higher sulfides with the components of the slag melt, conducted by the Scientific Center named after I.A. Onaev [ [10], [11]] showed that excess sulfur formed as a result of dissociation of higher sulfides is completely spent on magnetite reduction and slag sulfiding. Perhaps, these are single studies, where the possibility of simultaneous use of high-sulphur copper concentrate as a sulfidizing agent to improve the quality of converting products has been proved.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the thermal regime of converting of copper-lead matte with high-sulfur copper concentrate

Zoldasbay,

Argyn,

Dosmukhamedov

2023

KIMS/CUMR/MShKP

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According to the earlier conclusions about the possibility of direct processing of high-sulfur copper concentrates with copper-lead matte, analysis of the thermal regime of converting was carried out. It is shown that the traditional calculation methods used to calculate autogenous smelting are not entirely correct and require taking into account the effect of excess sulfur on the temperature regime of the process. It has been established that in the process of converting copper-lead mattes, a wide range of temperature variation is observed - from 1027 0С to 1300 0С. When the concentrate is combined with the matte, the temperature regime of the process is stabilized, which ensures the optimal level of SO2 concentration in the gases required for the production of sulfuric acid. Based on the calculation of the material balance of converting copper-lead mattes using the existing technology and with the addition of a concentrate, the structure of the heat balance of the converting process was established. A strong change in the structure of the heat balance is shown, which is explained by the reduction of magnetite with excess sulfur and an increase in heat due to the oxidation of an additional amount of iron sulfide introduced with the concentrate. A comparative analysis of the technological parameters of the 1st converting period of copper-lead mattes calculated by the proposed method with the practical data of a specific metallurgical unit allows assessing the degree of approximation of the processes occurring in the unit until the thermodynamic equilibrium.

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“…Some of the proposed technologies have been tested in a pilot scale, but they have not been applied into commercial production for various reasons [6]. The investigations on the interaction between the non-stoichiometric sulphides (chalcopyrite concentrate) and melted slag may be reffered to the system studies [7][8][9]. The authors have found that the excess sulfur of higher sulphides interacts with slag and is spent either on magnetite recovery or slag sulfidizing.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Сu, Zn, Pb, As compounds during copper-zinc concentrate and matte comelting in converters

Dosmukhamedov¹,

Zholdasbay²,

Argyn³

et al. 2020

nfm

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The practicability of improving the existing technology of converting copper mattes by comelting with the difficult-toprocess high-sulfur copper-zinc concentrate. The basis for research in the behavior of non-ferrous metals, arsenic and antimony is thermodynamic analysis of the reactions of matte components, converter slag and copper-zinc concentrate interaction in the temperature range 1073–1573 K. The behaviour mechanism of copper, zinc, lead, arsenic, and antimony compounds during co-processing of copper-zinc concentrate with matte is established. High values of the Gibbs free energy of reactions of interaction between oxides of lead and zinc with elemental sulfur, sulfides of non-ferrous metals and iron show the feasibility of the highest possible extraction of lead and zinc into dust in the form of their volatile compounds: sulfides, as well as oxides of lead and zinc in the metallic state in the form of gas. There is shown the possibility of the highest possible extraction of arsenic and antimony into dust by means of converting their nonvolatile pentavalent oxides (As2O5, Sb2O5) into volatile trivalent oxides (As2O3, Sb2O3) and non-toxic sulfides (As2S3, Sb2S3) by the converter slag sulfidizing with the components of copper–zinc concentrate: elemental sulfur and iron sulfide. Direct processing of copper-zinc concentrate in converter allows selective extracting copper into matte as well as lead and zinc into a rich semiproduct suitable for their extraction by existing technologies. It is shown that a significant quality improvement of the resulting converter slag and blister copper is achieved by the high sublimation of arsenic and antimony into dust under conditions of converting copper-lead mattes together with a high-sulfur concentrate.

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Investigation of Cu, Pb, Zn, As, Sb distribution during the lead semiproducts and copper-zinc concentrate comelting

Cited by 5 publications

References 0 publications

Extraction of Pb, Cu, Zn and As from Fine Dust of Copper Smelting Industry via Leaching with Sulfuric Acid

Extraction of Pb, Cu, Zn and As from Fine Dust of Copper Smelting Industry via Leaching with Sulfuric Acid

Analysis of the thermal regime of converting of copper-lead matte with high-sulfur copper concentrate

Behavior of Сu, Zn, Pb, As compounds during copper-zinc concentrate and matte comelting in converters

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