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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process
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Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process

机译：在氧化烧结颗粒生产过程中回收预氧化铬铁矿细粒

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摘要

The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is produced mainly by the carbothermic reduction of chromite ore. The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this technology specifies that recycling of chromite-containing dust collected from the pellet sintering off-gas and fines screened out from the sintered pellets (collectively referred to as pre-oxidized chromite fines) should be limited to a maximum of 4 wt% of the total pellet composition. However, the results presented in this paper suggest that recycling of such fines up to a limit of 32 wt% of the total peflet composition may improve the compressive and abrasion strengths of the cured pellet. In addition, electron microprobe and quantitative X-ray diffraction (XRD) analyses demonstrate that chromite grains present in the pre-oxidized chromite fines consist, at least partially, of crystalline phases/compounds that will improve the metallurgical efficiency and specific electricity consumption (i.e, MWh/ton FeCr produced) of the smelting process.
机译：不锈钢的铬（Cr）含量来自再生的废料和/或铬（FECRORCHROME（FECR），其主要由铬铁矿矿石的碳热还原产生。氧化烧结颗粒生产过程是最广泛应用的FECR过程之一。该技术的供应商规定，从沉淀烧结废气中收集的含铬铁矿的粉尘和从烧结粒料（统称为预氧化铬酸盐细粒）的筛分中的含铬酸盐的回收应限制为最多4wt％总颗粒组合物。然而，本文提出的结果表明，这些细粉的再循环至32wt％的总Peflet组合物的限度可以改善固化颗粒的压缩和耐磨强度。此外，电子微肺和定量X射线衍射（XRD）分析证明存在于预氧化铬酸盐细粒中的铬铁矿颗粒，至少部分地包括改善冶金效率和特定电力消耗的结晶相/化合物（即冶炼过程中的mwh / ton fecr制作）。

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