摘要
金矿石中常伴生锑、砷、硫及有机质等杂质,对金的测定有严重干扰,且金具有延展性,不易破碎。不消除这些影响,测金得不到很好的结果。样品经碎样加工、棒磨机打磨、盘磨机研磨成均匀且具有代表性试样。试样与氯化铵一起混匀,通过阶梯升温焙烧氧化法除锑、砷、硫及有机质等杂质,试样中金的组份转变为凝聚相的金属氯化物,铵盐成气态释放出去,其中的砷、硫、有机质等氧化,形成多孔的、渗透性好的焙砂,锑的化合物完全与氯化铵络合没有水解,提高金的浸出率,消除杂质对测金的干扰。本法讨论了金矿石样品加工、焙烧温度及除锑条件的选择对金测定的影响。经分析前技术处理其测定金值的主样与副样测定值相符,国家标准物质测定值与标值一致。回收率在99%~102%。分析结果符合地质试验测试质量规范要求,满足了实验测试工作的需要。
Gold ore is often associated with antimony, arsenic, sulfur, organic matter and other impurities, which severely interfere the determination of gold, moreover, gold is ductile, not easily broken. If these effects are not eliminated, gold measurement will not have good results. The samples are processed into uniform and representative samples by crushing, grinding with rod mill and then disc mill. Samples are blended with ammonium chloride, and the impurities such as antimony, arsenic,sulfur and organic matter can be eliminated by step heating roasting and oxidation. The components of gold in the samples are converted into metal chloride of condensed phase, and the ammonium salt is released as a gas. The arsenic, sulfur and organic matter are oxidized to form porous and permeable calcined sand. The compound of antimony is fully complexed with ammonium chloride without hydrolysis, which improves the leaching rate of gold and eliminates the interference of impurities on the measurement of gold. After technical treatment before analysis, the gold value of the main sample is consistent with the value of the duplicate sample, and the measurement value of the national standard substance is consistent with the standard value. The recovery rate is 99%-102%. The analysis results meet both the requirements of geological test quality specification and the needs of experimental testing.
作者
杨升
YANG Sheng(No.324 Unit,Bureau of Geology and Mineral Exploration of Anhui Province,Chizhou,Anhui 247000,China)
出处
《安徽地质》
2019年第4期308-311,共4页
Geology of Anhui
关键词
金
前处理
样品加工
杂质
焙烧氧化
gold
pretreatment
sample processing
impurities
roasting oxidation
