Sulphidation Roasting as Means to Recover Zinc from Oxidised Ores

Merkibaev, Yerik; Panayotova, Marinela; Luganov, V. A.; Panayotov, Vladko; Chepushtanova, T. A.

doi:10.7546/crabs.2018.08.14

Cited by 8 publications

(9 citation statements)

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“…To substantiate the process of chemical enrichment, we have performed a thermodynamic analysis of systems including nickel, cobalt, iron, sulphur, oxygen under the conditions of pyro-and hydrometallurgical processing. The ways of sulphidising roasting were published earlier (Merkibaev et. al., 2018).…”

Section: Thermodynamics Of Pyrometallurgical Processesmentioning

confidence: 99%

Iron Removal From Laden Bioleaching Solution by Processes of Solvent Extraction and Magnetite Synthesis

Georgiev¹,

Nicolova²,

Spasova³

et al. 2023

SEPRM

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Laden leach solution, generated from bioleaching of pyrometallurgical copper slags with a mixed culture of moderately thermophilic bacteria in a bioreactor, contains several base metals (Cu, Co, Zn) and a very high concentration of iron (33,9 g/ L). Further processing of cobalt and zinc to the respective final products requires preparatory iron removal from the laden leach solution. The direct iron removal from that solution as goethite was unacceptable because of the significant co-precipitation of copper and cobalt from the solution. The main aim of this paper is to study magnetite (Fe3O4) synthesis as an approach for iron removal to a value-added product as a step of the processing of a laden solution generated due to the bioleaching of non-ferrous metals in a bioreactor. Ferrous iron oxidation to ferric state was efficient when the addition of H2O2 (30 %) was combined with maintaining the pH 3,1-3,3 with NaOH and air purging. Solvent extraction with 25 % D2EHPA and 7,5 % TBP dissolved in kerosene efficiently separated the dissolved iron and the base metals from the processed solution. However, in the presence of H2, the iron was stripped from the organic solvent with low acid consumption. The applied precise control of the chemical precipitation and oxidation processes at 50 degrees Celsius allowed the iron content (11,7 g/ L) in the stripping solution to be removed efficiently as magnetite (Fe3O4). Based on the chemical content of iron, copper and sulphur, the synthesised nanoparticles of magnetite could be applicable in many sectors (steel, chemical, and electronics).

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Section: Thermodynamics Of Pyrometallurgical Processesmentioning

confidence: 99%

Iron Removal From Laden Bioleaching Solution by Processes of Solvent Extraction and Magnetite Synthesis

Georgiev¹,

Nicolova²,

Spasova³

et al. 2023

SEPRM

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Section: Thermodynamics Of Pyrometallurgical Processesmentioning

confidence: 99%

Features of Vibration Crushing of Geological Samples of Material

Fedoskina,

Yerisov,

Fedoskin

2023

SEPRM

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An innovative method of vibro-impact grinding of geological samples, implemented in a vibrating jaw crusher with an inclined crushing chamber, is considered to obtain a product of -1 mm in one crushing cycle. The technique consisted in comparing the results of crushing quartzite and magnetite with a particle size of 60...80 mm according to the existing multi-stage technology using jaw and roller crushers, as well as the proposed single-stage technology using a vibrating jaw crusher. Three technological schemes for the preparation of samples of quartzite and magnetite were modelled with obtaining granulometric characteristics after each piece of equipment. The analysis of the results showed almost the same particle size distribution of the samples according to the multi-stage scheme: jaw crusher, screening -2mm, roller crusher, screening -1mm and single-stage: vibrating jaw crusher, screening -1mm. The output of the finished material was 80%. The studies substantiated the feasibility of creating a small-sized vibrating jaw crusher with a crushing ratio of i ≥ 100 for the preparation of geological samples, operating in an open cycle and replacing at least two pieces of crushing equipment, two screens and mounting elements, which significantly reduces the metal consumption of the structure, the occupied area and simplifies maintenance.

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“…T he problem of increasing the rational and integrated use of mineral raw materials becomes most relevant when refractory polymetallic ores are involved in the production, which is due to significant industrial volumes of deposits. These types of ores include a number of deposits in Kazakhstan -this is the Zhairem deposit, as well as deposits in the Ural and Siberia [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The practice of concentrating plants has shown that the direct processing of such ores by enrichment methods, even with the selection of the reagent regime and the improvement of enrichment schemes, does not give satisfactory results. An analysis of existing technologies for the enrichment of oxidized and mixed ores of heavy non-ferrous metals shows that more than half of the metal losses in the tailings are due to their presence in the form of oxidized compounds [3][4]. The practice of using new flotation reagents and combined schemes does not allow increasing the extraction of metals by more than 2-3%.…”

Section: Introductionmentioning

confidence: 99%

Technology of high-temperature sulfidizing roasting of oxidized lead-zinc ore in a fluidized bed furnace

Chepushtanova¹,

Merkibayev²,

Baigenzhenov³

et al. 2023

nfm

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Zinc and lead are one of the most used metals in the world. The average annual growth rate of the zinc market is about 3.5%. Half of the zinc consumed in the world is used as electroplating, more than 30% is spent on the production of zinc alloys, including for the production of brass and bronze. At present, polymetallic ores are the main raw material for the production of lead and zinc. The production technology includes flotation enrichment of the initial ore raw material with subsequent pyrometallurgical or hydrometallurgical processing of the resulting concentrates. Unfortunately, the reserves of well-enriched sulfide ores are declining, which leads to the need to involve mixed and oxidized ores in the production. Obtaining zinc is also a relatively expensive process, one of the stages of which is the roasting of zinc sulfide concentrates in a fluidized bed furnace using oxygen-enriched air blast. In this regard, technologies aimed at processing hard-to-cut oxidized lead-zinc ores, as well as improving the process of roasting in a fluidized bed, are topical and in demand today. The article presents the technology and method for processing oxidized lead-zinc ore, including high-temperature sulfidizing roasting of oxidized compounds of lead and zinc, the results of roasting carried out in the presence of a high-sulfur sulfidizing agent in the form of pyrite (sulfur content is 45.15%), at molar ratios of metal oxide to pyrite NZnO/NFeS 2 and NPbO/NFeS 2 equal to 0.1-0.14 for sulfidizing in an air-blown fluidized bed furnace at a flow rate of 10 to 20 l/min, at a temperature of 750-800 °C, with a roasting time of 30-45 minutes. As a result of sulfidizing roasting, the degree of sulfidization reaches 88%, and the subsequent extraction of zinc from the non-magnetic fraction into a froth product in an open flotation cycle is 90% with a content of 23.4% zinc.

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Sulphidation Roasting as Means to Recover Zinc from Oxidised Ores

Cited by 8 publications

References 0 publications

Iron Removal From Laden Bioleaching Solution by Processes of Solvent Extraction and Magnetite Synthesis

Iron Removal From Laden Bioleaching Solution by Processes of Solvent Extraction and Magnetite Synthesis

Features of Vibration Crushing of Geological Samples of Material

Technology of high-temperature sulfidizing roasting of oxidized lead-zinc ore in a fluidized bed furnace

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