含碳难处理金精矿生物预氧化-TCCA浸金实验研究  

Experimental research on biological pre-oxidation and gold leaching by using TCCA for carbon-containing refractory gold ore

作　　者：牛会群 杨洪英 佟琳琳 NIU Huiqun;YANG Hongying;TONG Linlin(School of Mining Engineering,Heilongjiang University of Science and Technology,Harbin 150022,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]黑龙江科技大学矿业工程学院,哈尔滨150022 [2]东北大学冶金学院,沈阳110819

出　　处：《中国有色金属学报》2024年第10期3465-3475,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52274348);黑龙江省“优秀青年教师基础研究支持计划”项目(YQJH2023091)。

摘　　要：某含碳难处理金精矿中金含量15.9 g/t,铁、砷、硫和总碳的质量分数分别为23.17%、3.41%、24.7%和6.06%。金主要以次显微颗粒的形式被包裹于黄铁矿和砷黄铁矿中,同时碳引发“劫金”效应。本文针对该金精矿的特点开展了生物预氧化-TCCA(三氯异氰尿酸)浸金实验研究,建立多元线性回归模型分析浸金过程各因素对浸金效率的显著性影响。结果表明:经生物预氧化作用后,金精矿中硫和砷的分解效率分别可达63.59%和85.77%。拉曼光谱显示金精矿中碳质物缺陷减少,碳质物吸附能力下降。另外,多元线性回归模型分析显示,TCCA浓度、NaCl质量浓度和反应温度对浸金效率产生显著的影响,并呈正相关。TCCA浸金的最优化条件为:TCCA浓度0.22 mol/L,NaCl质量浓度30 g/L,反应温度45℃,矿浆中固体质量分数20%和反应时间3 h。在最优条件下,浸金效率可达87.49%,浸出液中金浓度为6.004 mg/L。A carbon-containing refractory gold concentrate contained Au 15.9 g/t,the mass fraction of Fe,As,S and total C were 23.17%,3.41%,24.7%and 6.06%,respectively.Au was mainly encapsulated by pyrite and arsenopyrite in the form of submicroscopic particles,and the presence of carbon led to“preg-robbing”effect.In this paper,based on the characteristics of gold concentrate,a biological pre-oxidation and TCCA gold leaching experiments were conducted,and the multiple linear regression model was established to analyze the significant influence of various factors on the gold leaching efficiency.The results show that after biological pre-oxidation,sulfur and arsenic decomposition efficiency reach 63.59%and 85.77%,respectively.Raman spectra reveals that there is a decrease in carbon defects within a reduction of gold-adsorbing capability.Furthermore,the multiple linear regression analysis indicates that TCCA,NaCl and temperature significantly affect the gold leaching efficiency with a positive correlation.The optimal conditions for TCCA leaching are as follows:TCCA concentration of 0.22 mol/L,NaCl concentration of 30 g/L,temperature of 45℃,solid mass fraction in slurry of 20%,and reaction time of 3 h,which results in a gold leaching efficiency of 87.49%and yields a final gold concentration in the leaching solution measured at 6.004 mg/L.

关 键 词：含碳难处理金精矿 生物预氧化 拉曼光谱 TCCA浸金 多元线性回归模型 

分 类 号：TF831[冶金工程—有色金属冶金]