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An experimental study on the solubility of copper bichloride in water vapor
Authors:Shang LinBo  Bi XianWu  Hu RuiZhong  Fan WenLing
Affiliation:(1) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
Abstract: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 
$$P_{H_2 O} $$
. The solubility of copper in vapor phase increased with increasing 
$$P_{H_2 O} $$
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:

$$CuCl_2^{solid}  + nH_2 O^{gas}  = CuCl_2 (H_2 O)_n^{gas} $$
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
Keywords:CuCl2   water vapor   solubility   experimental study
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