Preparation of Ultra-Fine Copper Oxalate Powder by Stripping Precipitation Method

Based on the interfacial mass transfer process, the ultra-fine copper oxide powder was prepared from the CCl₄-TOA-CuCl₂ organic phase by the stripping precipitation method with H₂C₂O₄-C₂H₅OH aqueous solution as the stripping agent and precipitant. The effects of preparation conditions on the structure and size distribution of CuC₂O₄ powders were studied by XRD, SEM, TEM and laser particle analysis. The results show that the TOA and Cu²⁺ concentrations in the organic phase, the H₂C₂O₄ and C₂H₅OH concentrations in the water phase, stripping temperature have obviously influence on the structure and size distribution of CuC₂O₄ powders, while the effect of stripping time is slight. At 40% TDA, 0.1 mol/L Cu²⁺, 0.10 mol/L H₂C₂O₄ 80% C₂H₅OH, stripping temperature of 15 ℃ and stripping time of 2 h, black brown, well dispersed CuC₂O₄ powders with the average size about 100 nm and high purity of monoclinic crystal phase were obtained.