有色设备

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 Fe3+ 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.