酸性氯化铜蚀刻废液一步沉淀法制备碱式碳酸铜

以酸性氯化铜蚀刻废液为原料,在Na₂CO₃和助剂A存在下,采用一步沉淀法制备碱式碳酸铜。考察了反应pH、n（Na₂CO₃）∶n（助剂A）、反应时间和反应温度对碱式碳酸铜制备效果的影响,并采用XRD、TG 及SEM对产品进行了表征。实验结果表明：在反应pH 7.0、沉淀剂配比n（Na₂CO₃）∶n（助剂A）=1∶2、反应时间1.0 h、反应温度70 ℃的条件下,产品的w（Cu²⁺）达55.62%,w（Cl^-）为0.013%,符合HG/T 4825—2015《工业碱式碳酸铜》的要求;蚀刻废液中Cu²⁺的回收率接近100%。表征结果表明,制得的产品为单一组分CuCO₃·Cu（OH）₂,小颗粒为直径1.8~5.4 μm的不规则球形,团聚后的大颗粒呈姜块状形貌,粒径为48~75 μm。

Preparation of basic copper carbonate from spent etching solution containing acidic CuCl2 by one-step precipitation process

The basic copper carbonate was prepared by using one-step precipitation process with spent etching solution containing acidic copper chloride as the main raw materials in the presence of Na₂CO₃ and adjuvant A. The effects of reaction pH,n（Na₂CO₃）∶n（adjuvant A）,reaction time and reaction temperature on preparation of the basic copper carbonate were investigated. The product was characterized by XRD,TG and SEM. The experimental results show that： Under the conditions of reaction pH 7.0,precipitant ratio n （Na₂CO₃）∶n （adjuvant A）is 1∶2,reaction time 1.0 h and reaction temperature 70 ℃,the w（Cu²⁺）of the product reaches 55.62%,and the w（Cl^-）is 0.013%,which meet the standard requirements of industrial basic copper carbonate （HG/T 4825-2015）;The recovery of Cu²⁺ is close to 100%. The characterization results show that the product is a single component CuCO₃·Cu （OH）₂,small particles of irregular spherical with a diameter of 1.8-5.4 μm,larger particles after agglomeration have a ginger block morphology,with a particle size of 48-75 μm.