湿法炼锌铜渣中镉量的测定方法与研究  

Determination Method and Study of Cadmium Amount in Copper Slag in Zinc Hydrometallurgy

作　　者：武逸云 WU Yi-yun

机构地区：[1]白银有色集团股份有限公司西北铅锌冶炼厂,甘肃白银730900

出　　处：《有色设备》2022年第5期46-50,共5页Nonferrous Metallurgical Equipment

摘　　要：在湿法炼锌生产过程中,对产品铜渣中镉量的测定一般采用原子吸收分光光谱法测定镉量,该方法分析误差大、干扰因素多;ICP-AES法测定结果相对稳定可靠,但分析成本高,不宜推广应用。为了在工艺生产中及时提供准确可靠的数据,克服以上两种方法的不足,研究开发了一种用盐酸-乙酸铵为底液示波极谱仪测定铜渣中镉量的分析方法。该方法底液为10%盐酸-10%乙酸铵,利用示波极谱仪有较高的分辨能力和抗先还原离子的干扰等特点来快速测定铜渣中的镉量。为了消除三价铁离子对测定的干扰,需加抗坏血酸进行还原,同时作为除氧剂。其测定含量范围广0.1%~15%,加标回收率99.30%~100.50%,相对标准偏差≤0.60%。本文通过实验数据分析该方法切实可行、准确度高、成本低,具有较高的推广应用价值。In the production process of zinc hydrometallurgy, the determination of cadmium in the product copper slag generally adopts atomic absorption spectroscopy, which has a large error margin and numerous interfering factors. Another method, the ICP-AES method, produces relatively stable and reliable results, but with high analytical cost posing difficulty for widespread application. In order to overcome the above mentioned shortcomings and provide accurate and reliable data in production, an analytical method for the determination of cadmium in copper slag by oscillometric polarimetry with hydrochloric acid-ammonium acetate as the substrate was developed. The method is based on 10% hydrochloric acid and 10% ammonium acetate, and uses the characteristics of oscillometric polarimeter with high resolution and resistance to the interference of first reducing ions to quickly determine the amount of cadmium in copper slag, while adopting ascorbic acid as the reducing agent to eliminate the interference of Fe^(3+) on the determination as well as to facilitate deoxidation. This method has a determination content range as wide as 0.1%~15%, with spiked recovery up to 99.30%~100.50%, and relative standard deviation ≤ 0.60%. Via analysis of experimental data, this paper illustrates the practicality, accuracy and cost-efficiency of this method, and argues for its suitability for general application.

关 键 词：示波极谱法 铜渣 盐酸-乙酸铵底液 镉 

分 类 号：X758[环境科学与工程—环境工程] TF803[冶金工程—有色金属冶金]