碳质金精矿与氰化尾渣协同焙烧—磁选富集分离金铁研究  

Study on synergistic roasting-magnetic separation enrichment for separation of gold and iron from carbonaceous gold concentrates and cyanide tailings

作　　者：张亮 宋永辉[1,2] 张辛未 董萍[1,2] 朱荣燕 石嘉俊 Zhang Liang;Song Yonghui;Zhang Xinwei;Dong Ping;Zhu Rongyan;Shi Jiajun(School of Metallurgical Engineering,Xi'an University of Architecture and Technology;Shaanxi Key Laboratory of Gold and Resources;Analysis and Test Center,Xi'an University of Architecture and Technology)

机构地区：[1]西安建筑科技大学冶金工程学院 [2]陕西省黄金与资源重点试验室 [3]西安建筑科技大学分析测试中心

出　　处：《黄金》2024年第4期32-39,56,共9页Gold

基　　金：国家自然科学基金项目(51774227);陕西省自然科学基金项目(2019JLM-44)。

摘　　要：针对碳质金精矿含碳量高导致金浸出率低和氰化尾渣含铁量高,造成资源浪费的问题,提出了碳质金精矿与氰化尾渣协同焙烧—磁选技术,分离并回收金、铁。研究结果表明,在碳质金精矿与氰化尾渣质量比为1∶1、焙烧温度为800℃、焙烧时间为60 min、碳酸钙质量分数为10%、磨矿细度为-0.074 mm占90%、磁场强度为0.20 T的条件下,平均金浸出率为82.47%,铁精矿铁平均品位为60.15%、平均铁回收率为75.58%。在焙烧过程中,碳质金精矿中碳质物、黄铁矿作为还原剂将氰化尾渣中赤铁矿还原为磁铁矿,降低了碳质物的“劫金”作用和黄铁矿对金矿物的包裹,对氰化尾渣中铁矿物进行回收的同时,也显著提高了金浸出率。该方法一举实现了碳质金精矿和氰化尾渣的综合回收利用,成本低廉、工艺简单,为碳质金精矿资源的综合利用提供了新思路。To address the issues of low gold leaching rates due to high carbon content in carbonaceous gold concentrates and high iron content in cyanide tailings,a synergistic roasting-magnetic separation technology for carbonaceous gold concentrates and cyanide tailings was proposed to separate and recover gold and iron.The research results showed that under the conditions of a mass ratio of carbonaceous gold concentrate to cyanide tailings of 1∶1,roasting temperature of 800℃,roasting time of 60 min,calcium carbonate mass fraction of 10%,grinding fineness of-0.074 mm accounting for 90%,and magnetic field intensity of 0.20 T,the gold leaching rate reached 82.47%,the iron grade of iron concentrate was 60.15%,and the iron recovery rate was 75.58%.During roasting,carbonaceous matter and pyrite in carbonaceous gold concentrates acted as reducing agents to reduce hematite in cyanide tailings to magnetite,reducing the"preg-robbing"effect of carbonaceous matter and the encapsulation of gold minerals by pyrite.This method not only recovers iron minerals from cyanide tailings but also significantly improves the gold leaching rate.It achieves the comprehensive recovery and utilization of carbonaceous gold concentrates and cyanide tailings,with low-cost and simple process,providing a new approach to the comprehensive utilization of carbonaceous gold ore resources.

关 键 词：碳质金矿 氰化尾渣 赤铁矿 真空焙烧 磁选 

分 类 号：TD953[矿业工程—选矿]