摘要
A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent.The effects of roasting temperature,roasting time and NaCl content on the volatilization rates of gold and zinc were investigated.The reaction mechanism and the phase transition process were also analyzed by means of SEM,EDS and XRD.The results demonstrated that under the optimal conditions of NaCl content of 10%,roasting temperature of 800℃,roasting time of 4 h and gas flow rate of 1 L/min,the rates of gold and zinc were 92%and 92.56%,respectively.During low-temperature chlorination roasting stage,a certain content of sulfur was beneficial to the chlorination reactions of gold and zinc;and during high-temperature chlorination roasting stage,the crystal structure of vanadium-bearing mica was destroyed,and the vanadium-containing oxides were beneficial to the chlorinating volatilization of gold and zinc.Eventually,the chlorinated volatiles of gold and zinc could be recovered by alkaline solution.
提出一种以NaCl为氯化剂、采用氯化焙烧法从难选含碳质金矿中同时回收金和锌的新工艺。研究焙烧温度、焙烧时间和NaCl含量对金、锌挥发率的影响。采用SEM、EDS和XRD对反应机理和相变过程进行分析。结果表明,在10%NaCl、焙烧温度为800℃、焙烧时间为4 h、气流速度为1 L/min的最佳条件下,金、锌的挥发率分别为92%和92.56%。在低温氯化焙烧阶段,一定的硫含量有利于金、锌的氯化反应;在高温氯化焙烧阶段,含钒云母的晶体结构被破坏,含钒氧化物有利于金、锌的氯化挥发。最后,金、锌的氯化挥发物可被碱性溶液回收。
作者简介
Corresponding author:冯雅丽,Tel:+86-13910839080,E-mail:ylfeng126@.126.com。
