L.Sh. Tsemekhman’s research while affiliated with Gipronickel Institute and other places

... Oxidative roasting followed by smelting, converting, anode casting, and electrolysis is a common method for processing copper-gold-silver sulfide ores [9,10]. Despite being well studied and extensively developed, this scheme is challenged by high levels of harmful 3Fe 2 (SO 4 ) 3 + Ag 2 SO 4 + 12H 2 O ⇆ 2AgFe 3 (SO 4 ) 2 (OH) 6 ↓ + 6H 2 SO 4 (1) ...

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Effect of Potassium Salt Addition on Silver Precipitation During Hydrothermal Synthesis of Argentojarosites

... Oxidative roasting followed by smelting, converting, anode casting, and electrolysis is a common method for processing copper-gold-silver sulfide ores [9,10]. Despite being well studied and extensively developed, this scheme is challenged by high levels of harmful 3Fe 2 (SO 4 ) 3 + Ag 2 SO 4 + 12H 2 O ⇆ 2AgFe 3 (SO 4 ) 2 (OH) 6 ↓ + 6H 2 SO 4 (1) ...

Reference:

Effect of Potassium Salt Addition on Silver Precipitation During Hydrothermal Synthesis of Argentojarosites

... During flotation, the bubble must overcome the matte-slag boundary and hold a matte drop when floating in the slag. Thus far, researchers have mainly focused either on the mineralogy of platinum in slag disposal areas formed during copper and nickel production [6] or the distribution of platinum between slag and matte [7][8][9][10]. Dependence of the flotation of matte droplets in slags of various compositions on the partial pressure of oxygen, interfacial tensions in this system were considered in [11][12][13][14], the breakthrough of the surface of two liquids by a gas bubble was analyzed in [15]. ...

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Behavior of platinum in the system of the matte-slag in the processing of copper-nickel ores

... Of special interest is to analyze the structure of the matte samples. The structure of mattes was closely studied by Ertseva [10][11][12]. However, she studied slowly cooled matte samples, which is known not to provide a fair view of the structure of the melt. ...

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Study of the Copper–Nickel Matte Granulation Process

... In this case, the purity of the starting material practically does not affect the result of inoculation. This can be a revolutionary approach to solving an urgent problem of metallurgical production -the problem of recycling waste slags of metallurgical production, primarily copper and nickel production [7][8][9][10]. Copper, titanium and nickel as alloying elements, entering the composition of "SAE" inoculant, have a very favorable influence on the iron structure and give it a number of specific properties, as a kind of "vitamin" additives. ...

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Nonwaste Recycling of Nonferrous Metallurgy Slags in Iron Casting

... Summarizing the obtained data, it can be concluded that, during the roasted of pyrrhotite concentrate pellets formed under natural conditions, conditions are provided for the accumulation of SO 2 in the pore volume, which affects the completeness of the secondary reactions during cinder cooling. By analogy with the oxidation of dispersed sulfide materials, when the interaction of particles with oxygen proceeds in an external diffusion mode [8] and iron oxides of higher oxidation states are formed on their surface [23,24], porous pellets behave in a similar way. However, in this case, the gas phase located in the pore space imprints on the composition of the pellets. ...

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Composition and constitution of pyrrhotite concentrate pellets after partial oxidative roasting

... Therefore, the bottom phase (Fe -Ni alloy), can only conditionally be considered as equilibrium phase in the system under researching. The works [5,6] related to the research of the Oxygen potential of gases influence to the reduction process showed that at Carbon absence, the Iron content in the metal can be controlled and, thereby, the Nickel content can be increased in ferronickel. ...

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Thermodynamic Modeling of Iron and Nickel Reduction from B2O3-CaO-FeO-NiO Melts

... One of the most promising technologies for processing copper sulfide concentrates is smelting in a Vanyukov furnace, which features high technological performance, minimal capital and operational costs [3][4][5]. In addition, the VF technology allows full and economical utilisation of sulfurous gases, drastically reducing harmful gas emissions into the environment [6,7]. The main direction of research work on VF technology is the autogenous smelting patterns (regularities), the study of the physical and chemical properties of smelting products, slag in particular, and ways to reduce the copper and magnetite content in slag [8][9][10][11][12][13][14][15][16][17][18][19][20]. ...

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Slag heterogeneity of autogenous copper concentrates smelting

... The pyrometallurgical method involves matte smelting and nickel iron smelting. Wet metallurgy includes reduction roasting atmospheric-pressure leaching, high-pressure atmospheric pressure sulfuric acid leaching method, and hydrochloric acid atmospheric pressure leaching method [34,35]. ...

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Exploring Strategies for Copper Removal from Nickel Anolytes: A Review

... As the most exploited mineral for the extraction metallurgy of copper, Ccp has been extensively studied theoretically and experimentally 7,[9][10][11][12]16,[20][21][22][23] suggested that it was extremely important and necessary for copper extraction to concentrate on the oxidative-roasting procedure of Ccp. Various reactions occurring in the oxidation of Ccp were summarised in early studies and are briefly presented in Fig. 1 7 , 13-15, 17, 18, 21, 22, 24, 25 . ...

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In–situ XRD and EDS method study on the oxidation behaviour of Ni– Cu sulphide ore