Smelting high-carbon ferrochrome with uniform briquetted batch

Tolymbekov, M. Zh.; Baisanov, S. O.; Izbembetov, Zh. Zh.; Abdulabekov, E. E.; Akuov, A.

doi:10.3103/s0967091210060124

Cited by 2 publications

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“…1a, 1b, 2a and 2b), which had been obtained by the scientists of the Chemical and Metallurgical Institute named after Zh. Abishev, were used in this work for comparison of the results [8].…”

Section: Technique Of the Experimentsmentioning

confidence: 99%

Study of phase transformations during heating of briquetted mono-charge from chromiumcontaining materials and carbon reducing agents

Shabanov¹,

Baisanov²,

Toleukadyr³

et al. 2023

cisisr

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The article presents the results of a study of phase transformations occurring during gradual heating of briquetted mono-charge. A complex of physical and chemical studies aimed at establishing the possibility of monocharge use for smelting of standard carbon ferrochromium was carried out in the laboratorial conditions on the basis of the Chemical and Metallurgical Institute named after Zh. Abishev. In order to study the phase transformations occurring in a mono-charge for smelting of high-carbon ferrochromium, thermograms of chromium briquettes of different variants were obtained in air oxidizing atmosphere and nitrogen inert atmosphere. Among them the following variants are mentioned: chromium fines mixed with a reducing agent, option I -Shubarkol coal; option II -Borlinsky coal; option III -China coke; as well as option IV -pure dust from Aktobe ferroalloy plant gas cleaning; option V -dust from pellet production site at Donskoy GOK with China coke and option VI -flash from production of briquettes with China coke. As a result of processing of thermograms, the peak temperatures and temperature intervals of behaviour of the thermal effects of chromium oxide interaction with used reducing agents were established. The method of differential thermal analysis (DTA) is based on the most important properties of a substance which are related to its chemical composition and structure and are reflected in the thermal changes of a substance when heated. The reason for the widespread use of this method of non-isothermal kinetics is that one experiment can determine all the kinetic constants, including the activation energy. Analyzing the calculated data on the activation energy, it is possible to assume the diffusion nature of inhibition of the reduction reaction for all studied chromium ore materials. Based on the values of the activation energy of the process, briquettes with Borlinsky coal and complex reducing agent have the highest reducibility.

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Section: Technique Of the Experimentsmentioning

confidence: 99%

Study of phase transformations during heating of briquetted mono-charge from chromiumcontaining materials and carbon reducing agents

Shabanov¹,

Baisanov²,

Toleukadyr³

et al. 2023

cisisr

View full text Add to dashboard Cite

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Technology for the production of high-carbon ferrochromium using mono-briquettes

Шабанов¹,

Izbembetov²,

Baisanov³

et al. 2018

Izv. vysš. učebn. zaved., Čern. metall.

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The article presents results of large-scale laboratory studies on the basis of Chemical-Metallurgical Institute named after Zh. Abishev on establishing the possibility of using a mono-charge for smelting standard carbon ferrochromium. Enlarged-laboratory studies were carried out in an ore-thermal furnace with transformer capacity of 200 kVA. Duration of the pilot campaign was 4 days. Three variants of briquettes containing various reducing agents were tested, including: traditional charge (coke PRC + special coke + Borolinsky coal); briquettes with coal from Shubarkol; briquettes with Borlinsky coal; briquettes with coke of China. As a comparative variant, traditional technology with charge materials without briquetting was used. In total, when conducted large-scale laboratory studies it was 41 smeltings. The tests began with a comparative version, which was chosen as technology closest to the technology at Aktobe ferroalloy plant. On the traditional charge, top worked without the uniformly gassing over entire surface of the top. Recovery rate of chromium in the alloy was 79.3 %. Change to briquettes with Shubarkol coal in general has led to the process intensification with more stable current load. The furnace productivity increased to 165.9 kg Cr/day due to increase in the contact surface of reacting phases in briquettes. When using briquettes with Borlinsky coal, satisfactory technological parameters of the smelting process for high-carbon ferrochrome were also obtained, extraction rate of chromium into the metal was 84.91 %. When using briquettes from 0 – 10 mm ore fraction ore and CPR coke in the charge, furnace operation and state of the top were not different from previous periods. The charge also went off evenly, without collapses, the briquettes on the top were not destroyed and current load was highly stable. The work also presents comparative technical and economic indicators for all technologies using mono-charge briquettes.

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Smelting high-carbon ferrochrome with uniform briquetted batch

Cited by 2 publications

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Study of phase transformations during heating of briquetted mono-charge from chromiumcontaining materials and carbon reducing agents

Study of phase transformations during heating of briquetted mono-charge from chromiumcontaining materials and carbon reducing agents

Technology for the production of high-carbon ferrochromium using mono-briquettes

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