Recovery of Kish Graphite from Steelmaking Byproducts with a Multi-Stage Froth Flotation Process

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Recycling Pub Date : 2023-11-18 DOI:10.3390/recycling8060092
Yingtong Chen, Wei-Ping Chiang, Ping-Yu Hsieh
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Abstract

Steelmaking processes inevitably generate large amounts of byproducts, including slags, specks of dust, etc., and their treatment has been a critical issue for the steelmaking industry. Kish graphite is a valuable substance existing in steelmaking byproducts, and the recovery of Kish graphite has attracted more attention in recent years. The purpose of this study was to use a multi-stage froth flotation process for the beneficiation of Kish graphite and to investigate the influence of flotation conditions on the mass distribution of graphite and impurities. The results showed that the dust D2 contained ~34 wt.% of graphite and thus had the highest potential for the recovery of Kish graphite. The dosages of frother (methyl isobutyl carbinol, MIBC) at 0.005 kg/t and collector (kerosene) at 1 kg/t were optimal for the flotation of Kish graphite. After three-stage froth flotation, the graphite content of the concentrate was progressively increased to 84.09 wt.%, and the entire recovery rate was 93.05%. During the multi-stage froth flotation process, most of the impurities were separated in stage I, but the Fe-containing impurities were mainly separated in stage II. Some Ca2+, Na+, and K+ were leached out, and there were barely any heavy metals in the liquid phases.
采用多级浮选工艺从炼钢副产品中回收基什石墨
炼钢过程中不可避免地会产生大量副产品,包括炉渣、粉尘等,其处理一直是炼钢行业的关键问题。基什石墨是存在于炼钢副产品中的一种有价值的物质,近年来基什石墨的回收引起了越来越多的关注。本研究的目的是采用多级泡沫浮选工艺选矿基什石墨,并研究浮选条件对石墨和杂质质量分布的影响。结果表明,粉尘 D2 含有约 34 重量%的石墨,因此回收基什石墨的潜力最大。浮选剂(甲基异丁基甲醇,MIBC)的用量为 0.005 kg/t,捕收剂(煤油)的用量为 1 kg/t,这两种用量是浮选基什石墨的最佳用量。经过三级泡沫浮选,精矿中的石墨含量逐渐增加到 84.09 wt.%,总回收率为 93.05%。在多级泡沫浮选过程中,大部分杂质在第一阶段分离,但含铁杂质主要在第二阶段分离。部分 Ca2+、Na+ 和 K+ 被浸出,液相中几乎没有重金属。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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