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中国无机分析化学:2022,12(3):123-128
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铅试金富集条件对KSCN滴定铜阳极泥中银的影响
储悦
(安徽工业大学冶金工程学院)
Effect of Enrichment Conditions of Lead Assay on Titrating Silver in Copper Anode Slime Titrated with Potassium Thiocyanate
chu yue
(School of Metallurgical Engineering, Anhui University of Technology)
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投稿时间:2021-11-22    修订日期:2021-11-29
中文摘要: 针对铅试金重量法测定铜阳极泥中银时存在 Pb、Bi、Pd、Cu、Te 等元素干扰的问题,建立了铅试金捕集贵金属—硫氰酸钾滴定测定铜阳极泥中银。选取代表性、银品位较高的铜阳极泥为样品,在熔渣硅酸度 K=1.5,温度由 900℃升至 1100℃用时 40min 条件下熔炼 30min,在 920℃以 1.0g/min 金属铅的速度进行灰吹,灰吹结束后立即关闭电源,降温取出灰皿,合粒硝酸溶解后采 用 KSCN 直接滴定银,优化条件下银品位测定平均值为 86.31 kg/t(n=4)、RSD=0.42%,加标回收率在 98.85%~99.52%、RSD=0.28%。该法可有效消除 Pb、Bi、Pd、Cu、Te 等元素对银测定的影响,提高检测铜阳极泥中银品位的精确度。
中文关键词: 铅试金  硫氰酸钾滴定  铜阳极泥  
Abstract:Aiming at the interference of elements such as Pb, Bi, Pd, Cu and Te in thedetermination of silver in copper anode slime by lead assay gravimetric method, a method for the determination of silver in copper anode slime by lead assay with precious metal-potassium thiocyanate titration was established. The representative copper anode slime with high silver grade was selected as the sample. The silicic acidity of slag K=1.5, the temperature was raised from 900 to 1100 C for 40 min and the melting time was kept for 30 min. The magnesia ash dish was used for ash blowing at 920 C at the speed of 1.0 g/min lead metal. After the ash blowing, the temperature was immediately lowered to 650 C, and the obtained composite particles were titrated silver directly by KSCN after nitric acid dissolution. Under the optimized conditions, the silver grade of average values was 86.31 kg/t (n=4), RSD=0.42%, and the recovery was 98.85%~99.52% ,RSD=0.28% respectally. The method can effectively eliminate the influence of elements such as Pb, Bi, Pd, Cu and Te on the determination of silver and improve the accuracy of detecting silver grade in copper anode slime.
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基金项目:国家重点实验室开放基金资助
引用文本:
储悦.铅试金富集条件对KSCN滴定铜阳极泥中银的影响[J].中国无机分析化学,2022,12(3):123-128.
chu yue.Effect of Enrichment Conditions of Lead Assay on Titrating Silver in Copper Anode Slime Titrated with Potassium Thiocyanate[J].Chinese Journal of Inorganic Analytical Chemistry,2022,12(3):123-128.

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