An experimental study on the solubility of copper bichloride in water vapor

Using the solubility method, the solubility of CuCl₂ in liquid-undersaturated HCl-bearing water vapor was investigated experimentally at temperatures of 330–370°C and pressures of 4.2–10 MPa. The results have shown that hydration could significantly enhance copper solubility and the concentrations of copper were positively correlated with . The solubility of copper in vapor phase increased with increasing at the constant temperature. CuCl₂ was transported as hydrated species CuCl₂(H₂O)_n ^gas in water vapor. The formation of complexes is proposed to be the result of the following reaction: The hydration number n decreased slightly with increasing temperature. Statistical hydration numbers are 4.0, 3.6 and 3.3 at 330, 350 and 370°C, respectively. Supported jointly by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-125), the National Natural Science Foundation of China (Grant Nos. 40503007 and 40373020) and the Western Light Program