Waste Valorization Process: Sulfur Removal and Hematite Recovery from High Pressure Acid Leach Residue for Steelmaking,ACS Sustainable Chemistry & Engineering

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Waste Valorization Process: Sulfur Removal and Hematite Recovery from High Pressure Acid Leach Residue for Steelmaking
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-08-18 00:00:00 , DOI: 10.1021/acssuschemeng.7b02245
Cheen Aik Ang ₁ , Feixiong Zhang ₁ , Gisele Azimi _{1,

2}

Affiliation

The current study put the emphasis on developing a novel and environmentally friendly waste valorization process to refine hematite from the residue of the high-pressure acid leaching (HPAL) of nickel laterite ore. The developed process consists of an alkaline leaching step utilizing sodium hydroxide to reduce the sulfur impurity content in the HPAL residue. This novel process is very efficient as it can be run at room temperature in a significantly short residence time (10 min). The refined HPAL residue has sulfur content below the accepted threshold by the steelmaking industry; hence, it can potentially be used as a raw material. The proposed waste valorization process has the double advantage of generating a commercially valuable product from otherwise a waste stream and simultaneously providing environmental benefits through reducing the amount of scrapped leach residue and costs associated with constructing and maintaining storage facilities.

中文翻译：

废物平衡过程：从炼钢厂的高压酸浸残渣中去除硫和赤铁矿

当前的研究重点是开发一种新颖且环保的废物增值工艺，以从镍红土矿石的高压酸浸（HPAL）残渣中提炼赤铁矿。开发的方法包括利用氢氧化钠进行碱浸的步骤，以减少HPAL残留物中的硫杂质含量。这种新颖的方法非常有效，因为它可以在室温下以非常短的停留时间（10分钟）运行。精制的HPAL残留物的硫含量低于炼钢行业认可的阈值；因此，它有可能被用作原材料。

更新日期：2017-08-19

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