Thermodynamic prediction of the possibility of comprehensive processing chrysotile-asbestos waste

Akylbekov, Yerbol; Shevko, Viktor; Karatayeva, Gulnara

doi:10.1016/j.cscee.2023.100488

Case Studies in Chemical and Environmental Engineering

2023

DOI: 10.1016/j.cscee.2023.100488

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Thermodynamic prediction of the possibility of comprehensive processing chrysotile-asbestos waste

Yerbol Akylbekov,

Viktor Shevko,

Gulnara Karatayeva

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2024

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Cited by 3 publications

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Optimization of pyroprocessing of zinc sulfide ore to produce ferroalloy and zinc

Makhanbetova,

Shevko,

Aitkulov

et al. 2024

E3S Web of Conf.

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The article presents the results of thermodynamic analysis and experiments on the electric smelting of Shalkiya ore (5.2% of ZnS, 1.0% of PbS, 50% of SiO2) with the joint producing a silicon-containing ferroalloy and extracting zinc and lead into sublimates. The studies included the thermodynamic modeling using the HSC-6.0 software package and electric smelting in an arc furnace. It was established that the interaction in a ZnS-Fe3O4-2C system under equilibrium conditions is of a stepwise nature with the initial reduction of Fe3O4 to Fe and FeO at 600-1000 °C, then the interaction of ZnS with Fe at 1100-1800 °C with the formation of gaseous zinc, and the interaction of ZnS with FeO with the predominant formation of zinc at temperatures above 1600 °C. The electric smelting a charge containing the Shalkiya ore, coke, magnetite concentrate (85.9% of Fe3O4) and steel shavings allowed us to establish that FeSi45 grade ferrosilicon (41.8-44.6% of Si), with the extraction of 80-85.4% of Si, can be produced in the presence of 24.9-30% of coke with the replacement of magnetite’s iron by steel shavings’ iron from 20.9 to 91.8%. A lower degree of this replacement is associated with intensive development of foaming and a decrease in the extraction of silicon into the alloy. At least 98% of zinc and 96% of lead are extracted into the resulting sublimates containing 29.4% of zinc and 15.1% of lead.

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Optimization of pyroprocessing of zinc sulfide ore to produce ferroalloy and zinc

Makhanbetova,

Shevko,

Aitkulov

et al. 2024

E3S Web of Conf.

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Thermodynamic and Experimental Substantiation of Comprehensive Processing of Zinc Sulfide Ore and Its Concentration Tailings to Extract Non-Ferrous Metals and Produce a Silicon Ferroalloy

Shevko,

Makhanbetova,

Aitkulov

et al. 2024

Minerals

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This article presents the results of thermodynamic and experimental studies on the joint processing of a mixture of Shalkiya deposit zinc–lead sulfide ore and its concentration tailings in the presence of coke and magnetite. Using the HSC-6.0 software package, it was established by thermodynamic modeling that the silicon-containing products of the SiO2 reduction in the system under consideration are FeSi, Si, Fe3Si, Fe5Si3, FeSi2, FeSi2.33, and SiOg, which, based on the starting reduction temperature, form an increasing series: Fe3Si (1200 °C); Fe5Si3, Si (1400 °C); and SiOg, FeSi2, FeSi2.33 (1500 °C). The smelting of the zinc–lead sulfide ore and concentration tailings mixture in the case of replacing 55% of the iron contained in the magnetite concentrate with steel shavings iron allowed us to produce FeSi45 ferrosilicon (41.9%–42.1% Si), with the extraction of 85% of the silicon in it, and sublimates containing 26.03% zinc and 13.47% lead, with the extraction of 97% of the zinc and 99% of the lead in them. In comparison with the initial ore-tailings mixture, the resulting sublimates are 11.83 times richer in zinc.

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The use of vinyl and vinylidene chloride latexes in the manufacture of asbestos cardboard

Mal'cev,

Yur'ev

2024

Forestry Engineering Journal

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The need to create an inexpensive paper-like material based on mineral fibers is due to the protection of thermal insulation of pipelines. Materials used: mineral fibers ‒ asbestos grades M-4-20; binder ‒ vinyl- and vinylidene-chloride latexes VKHVD-65, DVKHB-70; coagulant ‒ aluminum sulfate. Method used: production of samples of asbestos cardboard from a fibrous composition in a TAPPI sheet‒filling machine, wt. h.: 100 asbestos fiber; 5‒60 latex; 3‒10 coagulant. For each composition of the fibrous composition, 10 samples were cast for testing. The properties of the material are characterized by physical‒mechanical parameters: breaking length (L, m); tear resistance (E, mN) and penetration (Po, kPa); absorbency during unilateral wetting (G, g/m2) and capillary (B, mm); degree of sizing (C, c/mm). Results: the strength of castings depends on the nature, binder and coagulant content: for latexes DVKHB-70/ VKHVD-65 ‒ Lmax = (504‒662)/(384‒417) with a significance level of α = 0.05 in the composition, wt.h.: 5‒20 latex; 3‒6 coagulant; Lmin = 206/(132‒168) with α = 0.05 in composition, wt.h.: 25‒60 latex; 7‒10 coagulant; Po(max) = (14‒15)/20 kPa with α = 0.05 at a content of 10/(10‒20) wt.h. latex. Samples with VKHVD-65 are hydrophilic: Gmax / Bmax = (2 ‒3)/(4‒5) with α = 0.05. With an increase in the content of DVKHB-70, the values of G decrease from 1‒3 to zero with α = 0.05; B ≈ 0 for any content of DVKHB-70. The results mean: in theory, the physical and mechanical properties of asbestos cardboard are determined by the film‒forming properties of binders ‒ synthetic latexes; in practice, the compositions of fibrous suspensions for obtaining a protective material with high consumer properties are determined. Conclusion: a key advantage for readers is the practical confirmation of the possibility of creating new composite materials with ingredients of various natures ‒ mineral and organic. The range of latexes with other monomers suitable for the production of asbestos cardboard remains unresolved.

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Thermodynamic prediction of the possibility of comprehensive processing chrysotile-asbestos waste

Cited by 3 publications

References 12 publications

Optimization of pyroprocessing of zinc sulfide ore to produce ferroalloy and zinc

Optimization of pyroprocessing of zinc sulfide ore to produce ferroalloy and zinc

Thermodynamic and Experimental Substantiation of Comprehensive Processing of Zinc Sulfide Ore and Its Concentration Tailings to Extract Non-Ferrous Metals and Produce a Silicon Ferroalloy

The use of vinyl and vinylidene chloride latexes in the manufacture of asbestos cardboard

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