Extraction of zinc oxide from electric arc furnace dust. Solubilities of zinc chloride and zinc oxide in aqueous ammonium chloride solutions from 303–363 K
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説明
Abstract Through our waste minimization studies in the SC 33/50 Technical Assistance Program (SC TAP), we found the Burrows process as modified by Myerson [1] to be attractive for South Carolina industry because of its low capital cost and its simplicity. However, many thermo‐dynamic properties are not available for practical application of the process. Therefore, our objective was to determine key solubility data: (1) the ZnCl2 + NH4Cl + H2O system and (2) the ZnO + NH4Cl + H2O system. The first system is important because the diamino zinc chloride compounds are known to form. The second system provides the thermodynamic behavior of the zinc oxide in the presence of chloride ion important for crystallizer design. At 363 K, the solubility of ZnCl2 decreased from 85 wt % at 1.49 wt % ammonium chloride to 79.3 wt % at 6.22 wt % ammonium chloride. As the temperature approached 333 K and 4.55 wt % NH4Cl, the solubility seemed to show a minimum. At 303 K, the phase boundary showed a sharp transition with two b...
収録刊行物
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- Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology
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Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology 32 497-515, 1997-02-01
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