Smelting options for carbon ferrochrome based on ore raw materials, middlings and their technological evaluation

Baisanov, S. O.; Shabanov, Ye.Zh.; Григорович, К. В.; Toleukadyr, R. T.; Inkarbekova, I. S.

doi:10.31643/2022/6445.06

Cited by 2 publications

(3 citation statements)

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“…The following composite components were used as a source for the synthesis of a new type of binder: the mineral part of refined ferrochromium slag (source of CaO and SiO 2 ), ferruginous forms of diatomite (source of SiO 2 and FeO), fine coke (source of SiO 2 , pellet heating temperature controller-pulverized screening of special coke of Sary-Arka Spetskoks LLP Coke Plant), an aqueous solution of liquid glass (binder) [19]. Refined ferrochrome slag (RFS) is a dry pulverized mass with metallic inclusions.…”

Section: Methodsmentioning

confidence: 99%

“…The authors of [19] present the results of a study on the sintering of chromite fines with the determination of the influence of such factors as the dispersion and dosage of coke fines, the moisture content of the sinter charge and the duration of ignition on the efficiency of sintering of fine chromite. It is shown that the sintering of chromite fines is characterized by a higher sintering temperature (1450-1500 • C) and a longer cooling time compared to iron ores.…”

Section: Introductionmentioning

confidence: 99%

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Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Ultarakova,

Tastanov,

Sadykov

et al. 2023

J. Compos. Sci.

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This study presents the results of the enlarged laboratory research on the melting of calcined composite pellets for ferrochrome obtained from fine-dispersed conditioned chrome concentrate containing 50.3% Cr2O3. This is a product of the gravitational beneficiation of waste sludge tailings from the Dubersay tailings dump at the Donskoy Mining and Processing Plant (DMPP) of JSC “TNC Kazchrome”. The composition of the charge for obtaining composite pellets consisted of 88.5% of chrome concentrate, 3% of mineral part of refined ferrochrome slag (RFC), 4% of ferruginous diatomite, 3% of coke and 1.5% of liquid glass. The initial charge was pelletized on a laboratory pelletizer to a size of 6–10 mm, dried at room temperature for 24 h and fired at 1200 °C for 60 min at a heating rate of 15 deg/min. On the basis of the developed composite annealed pellets, studies on the production of high-carbon ferrochrome at different melting temperatures were carried out. The results showed that with an increase in temperature from 1750 to 1850 °C, the iron–chromium phase in the composition of the alloy increases from 45.2 to 50.1%, the chromium carbide phase decreases from 23.7 to 11.3% and the chromium–iron phase increases from 7 to 11.2%. The carbon content in the alloys at temperatures from 1750 to 1850 °C varies from 7.2 to 8.94%, respectively. The maximum chromium content of the alloy is 64.82% with a melting point of 1850 °C; this alloy can be classified as FeCr60C90LP grade ferrochrome according to the international Chinese standard, which has no more than 0.03% phosphorus and no more than 0.1% sulfur.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Ultarakova,

Tastanov,

Sadykov

et al. 2023

J. Compos. Sci.

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“…As a result, it is shown that the recovery process is controlled by the process diffusion, and the activation energy ranges from 61.5 to 72.25 kJ/mol. In other studies [16], the kinetics and mechanism of reduction of agglomerates are studied using traditional types of reducing agents.…”

Section: Introductionmentioning

confidence: 99%

Study of the isothermal kinetics of reduction of sinter from mill scale

Zhunussov,

Bykov,

Kenzhebekova

et al. 2023

KIMS/CUMR/MShKP

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Studies of the isothermal kinetics of the reduction of sinter from mill scale were carried out at Zh. Abisheva Chemical and Metallurgical Institute (Karaganda). The influence of temperature and heating time on the degree of reduction of iron and other elements was studied in the Tamman furnace by the thermogravimetric method. The amount of reducing agent was taken in the experiments based on the stoichiometrically necessary amount of carbon for the complete reduction of iron oxides by more than 60%, as well as for the carburization of the resulting metal to 2.0% C. To obtain the kinetic characteristics of the reduction of the studied materials, depending on the temperature and duration of the process, processing of the received data array according to the models developed especially for these cases. The results of experimental data processing according to the Gistling-Brownstein model are presented. As a general assessment, this model with a sufficiently high correlation (R not less than 0.9) describes the studied process, which confirms its diffusion character. Analyzing the calculated data of the activation energy, one can assume the diffusion nature of the inhibition of the reduction reaction of all the materials under study. The value of the activation energy of the process shows that the agglomerate with dolomite (fluxed agglomerate) has the highest reducibility. During the frontal reduction of oxides of iron and other elements with carbon, a slag shell is formed around the grains of materials, which consists mainly of acidic oxides of barren rock, non-metallic inclusions of lightweight scrap and reducing agent ash and has a high viscosity. Its thickness depends on the composition of the material, temperature, time and degree of reduction.

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Smelting options for carbon ferrochrome based on ore raw materials, middlings and their technological evaluation

Cited by 2 publications

References 1 publication

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Study of the isothermal kinetics of reduction of sinter from mill scale

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