Mechanism and sequence of the metal reduction in the lattice of chromospinelides

Рощин, В. Е.; Рощин, А. В.; Akhmetov, K. T.

doi:10.1134/s0036029514030021

Cited by 8 publications

(5 citation statements)

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“…The XRD pattern in Figure 4 shows the chromite phase, but V. E. Roshchin et al showed that chromium ore might correspond to the (Mg 2+ , Fe 2+ )[Fe 3+ , Al 3+ , Cr 3+ ]O 4 , the complex oxide spinel [19]. Figure 5 presents the SEM image and EDS results for the chromium ore used in the present study.…”

Section: Methodsmentioning

confidence: 85%

Preliminary reduction of chromium ore using Si sludge generated in silicon wafer manufacturing process

Jung

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Johra

et al. 2018

J min metall B Metall

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In order to promote the recycling of by-product from Si wafer manufacturing process and to develop environment-friend and low cost process for ferrochrome alloy production, a basic study was performed on the preliminary reduction reaction between chromium ore and the Si sludge, comprised of SiC and Si particles, which is recovered from the Si wafer manufacturing process for the semiconductor and solar cell industries. Pellets were first made by mixing chromium ore, Si sludge, and some binders in the designed mixing ratios and were then treated at different temperatures in the 1116 °C-1388 °C range in an ambient atmosphere. Cordierite and SiO 2 were confirmed to be formed in the products after the reduction. Additionally, metal particles were observed in the product with Fe, Cr, and Si components. It is found that temperatures above 1300 °C are necessary for the reduction of the chromium ore by the Si sludge. The reduction ratio for Fe was evaluated quantitatively for our experimental conditions, and the proper mixing ratio was suggested for the pre-reduction of the chromium ore by the Si sludge. This study provides basic information for the production of ferrochrome alloys on the pre-reduction of chromium ore using Si sludge.

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Section: Methodsmentioning

confidence: 85%

Preliminary reduction of chromium ore using Si sludge generated in silicon wafer manufacturing process

Jung

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Johra

et al. 2018

J min metall B Metall

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“…In the process of magnetic separation, only strong magnetic materials, such as metallic iron and magnetite, can be retained in the magnetic field in the magnetic separation tube, while other diamagnetic or paramagnetic materials, such as slag and residual carbon, will remain with the tail slag in the flowing water [ 35 ]. According to previously published research [ 36 , 37 , 38 ], chromium cannot be significantly reduced into metal at a temperature of 1373–1573 K, and the products obtained from magnetic separation contain almost no chromium; that is, (% Cr ) a is very low and (% Cr ) s is high, making L Cr in the magnetic separation process higher. As shown in Figure 9 , the chromium recovery rates in Experiment NO.…”

Section: Resultsmentioning

confidence: 99%

Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic Separation Treatment

Wang

et al. 2021

Materials

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Concentrating the chromium in chromium slag and improving the chromium–iron ratio is beneficial for the further utilization of chromium slag. In this paper, chromium slag obtained from a chromite lime-free roasting plant was used as the raw material. Pellets made of the chromium slag and pulverized coal were reduced at different pre-reduction temperatures and then separated by a melting separation process or magnetic separation process, respectively. The mass and composition of the metallized pellets before separation, along with the alloy and tail slag after separation, were comprehensively analyzed. The experimental results showed that the output yield of alloy, iron recovery rate, and chromium content in the alloy were all higher when using melting separation than when using magnetic separation, because of the further reduction during the melting stage. More importantly, a relatively low pre-reduction temperature and selection of magnetic separation process were found to be more beneficial for chromium enrichment in slag; the highest chromium–iron ratio in tail slag can reach 2.88.

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“…The formation of carbide shell worsens the surface of the reagents, retards and stops the reduction process. The measures to overcome the negative effect of carbide shell on the solid-phase reduction process have been studied earlier in other works [19][20][21].…”

Section: Objectives and Experimental Methodologymentioning

confidence: 99%

Characteristics of Metal Reduction During Prereduction of Chromite types of Ore

Рощин¹,

Рощин²

2019

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Mechanism and sequence of the metal reduction in the lattice of chromospinelides

Cited by 8 publications

References 1 publication

Preliminary reduction of chromium ore using Si sludge generated in silicon wafer manufacturing process

Preliminary reduction of chromium ore using Si sludge generated in silicon wafer manufacturing process

Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic Separation Treatment

Characteristics of Metal Reduction During Prereduction of Chromite types of Ore

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