Industrial utilization of arsenic-containing gold dressing tailings as pellet prepared by straight grate process

IF 3.7 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Central South University Pub Date : 2024-07-23 DOI:10.1007/s11771-024-5690-8

Wei Liu, Zheng-qi Guo, De-qing Zhu, Jian Pan, Wu-ju Zhang, Jin Wang, Ying-qun Zhang, Fu-xing Yin

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Abstract

The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide. The thermodynamic analysis results indicate that ferrous arsenate (FeAsO₄), pyrite (FeS₂) and sodium cyanide (NaCN) in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process, and the removal of pyrite and sodium cyanide is basically completed during the preheating stage, while the removal of ferrous arsenate requires the roasting stage. The pellets undergo a transformation from magnetite to hematite during the preheating process, and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite (Fe₂O₃) during the roasting process. Ultimately, pellets with removal rates of 80.77% for arsenic, 88.78% for sulfur, and 99.88% for cyanide are obtained, as well as the iron content is 61.1% and the compressive strength is 3071 N, meeting the requirements for blast furnace burden. This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings, benefiting gold production enterprises.

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以直篦法制备的球团形式对含砷选金尾矿进行工业利用

含砷金选矿尾矿的利用是全球黄金生产企业面临的一个紧迫问题。热力学分析结果表明，采用直篦式工艺可有效去除含砷金选冶尾矿中的砷酸亚铁（FeAsO4）、黄铁矿（FeS2）和氰化钠（NaCN），黄铁矿和氰化钠的去除在预热阶段基本完成，而砷酸亚铁的去除则需要焙烧阶段。球团在预热过程中经历了从磁铁矿到赤铁矿的转变，并在焙烧过程中通过赤铁矿（Fe2O3）的微晶结合和高温再结晶而固化。最终得到的球团砷去除率为 80.77%，硫去除率为 88.78%，氰化物去除率为 99.88%，铁含量为 61.1%，抗压强度为 3071 N，满足高炉炉料的要求。该研究为处理含砷黄金冶炼尾矿提供了一种工业上可行的方法，有利于黄金生产企业。

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来源期刊

Journal of Central South University METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.10

自引率

6.80%

发文量

242

审稿时长

2-4 weeks

期刊介绍： Focuses on the latest research achievements in mining and metallurgy Coverage spans across materials science and engineering, metallurgical science and engineering, mineral processing, geology and mining, chemical engineering, and mechanical, electronic and information engineering