The isopiestic method was used to determinate isopiestic molality and osmotic coefficients in single salt solutions of LiCl H 2O(molality range from 0.5 to 9.0 mol·kg -1 ),CaCl 2 H 2O(molality range from 0.35 to ...The isopiestic method was used to determinate isopiestic molality and osmotic coefficients in single salt solutions of LiCl H 2O(molality range from 0.5 to 9.0 mol·kg -1 ),CaCl 2 H 2O(molality range from 0.35 to 5.2 mol·kg -1 ) and multisalt solution LiCl CaCl 2 H 2O(ionic strength range from 0.5 to 15.7 mol·kg -1 ) at 298.15K,from which Pitzer’s interaction parameters of single salt ,mixed salts of the systems were obtained.The mean ionic activity coefficients of LiCl、CaCl 2 in pure and mixed solutions were reported.展开更多
Focusing on the most important NaAl(OH)4-NaOH-H2O system in the industry of alumina production, the feasibility of establishing a calculation model of activity coefficients according to Debye-Hückel theory via th...Focusing on the most important NaAl(OH)4-NaOH-H2O system in the industry of alumina production, the feasibility of establishing a calculation model of activity coefficients according to Debye-Hückel theory via the equilibrium solubility data of sodium aluminate solution is discussed in this paper. Firstly, the hypotheses for applying Debye-Hückel theory into NaAl(OH)4-NaOH-H2O system are involved and the values of parameters are determined. Then the applicability of Debye-Hückel model in NaAl(OH)4-NaOH-H2O system is testified. The results indicate that Debye-Hückel model is applicable to the establishment of calculation model of activity coefficients in NaAl(OH)4-NaOH-H2O system and the value of -NaAl(OH)4 is estimated as 0.3595 nm.展开更多
To design optimal pyrometallurgical processes for nickel and cobalt recycling, and more particularly for the end-of-life process of Ni-Co-Fe-based end-of-life（EoL） superalloys, knowledge of their activity coefficien...To design optimal pyrometallurgical processes for nickel and cobalt recycling, and more particularly for the end-of-life process of Ni-Co-Fe-based end-of-life（EoL） superalloys, knowledge of their activity coefficients in slags is essential. In this study, the activity coefficients of NiO and CoO in CaO-Al_2O_3-SiO_2 slag, a candidate slag used for the EoL superalloy remelting process, were measured using gas/slag/metal equilibrium experiments. These activity coefficients were then used to consider the recycling efficiency of nickel and cobalt by remelting EoL superalloys using CaO-Al_2O_3-SiO_2 slag. The activity coefficients of NiO and CoO in CaO-Al_2O_3-SiO_2 slag both show a positive deviation from Raoult＇s law, with values that vary from 1 to 5 depending on the change in basicity. The activity coefficients of NiO and CoO peak in the slag with a composition near B =（%CaO）/（%SiO_2） = 1, where B is the basicity. We observed that controlling the slag composition at approximately B = 1 effectively reduces the cobalt and nickel oxidation losses and promotes the oxidation removal of iron during the remelting process of EoL superalloys.展开更多
文摘The isopiestic method was used to determinate isopiestic molality and osmotic coefficients in single salt solutions of LiCl H 2O(molality range from 0.5 to 9.0 mol·kg -1 ),CaCl 2 H 2O(molality range from 0.35 to 5.2 mol·kg -1 ) and multisalt solution LiCl CaCl 2 H 2O(ionic strength range from 0.5 to 15.7 mol·kg -1 ) at 298.15K,from which Pitzer’s interaction parameters of single salt ,mixed salts of the systems were obtained.The mean ionic activity coefficients of LiCl、CaCl 2 in pure and mixed solutions were reported.
文摘Focusing on the most important NaAl(OH)4-NaOH-H2O system in the industry of alumina production, the feasibility of establishing a calculation model of activity coefficients according to Debye-Hückel theory via the equilibrium solubility data of sodium aluminate solution is discussed in this paper. Firstly, the hypotheses for applying Debye-Hückel theory into NaAl(OH)4-NaOH-H2O system are involved and the values of parameters are determined. Then the applicability of Debye-Hückel model in NaAl(OH)4-NaOH-H2O system is testified. The results indicate that Debye-Hückel model is applicable to the establishment of calculation model of activity coefficients in NaAl(OH)4-NaOH-H2O system and the value of -NaAl(OH)4 is estimated as 0.3595 nm.
基金the support of a scholarship provided by the Japan Society for the Promotion of Science(No. H26-3293)the scholarship provided by the Ministry of Education,Culture,Sports,Science and Technology,Japan(Registered number: 123032) during his doctor course
文摘To design optimal pyrometallurgical processes for nickel and cobalt recycling, and more particularly for the end-of-life process of Ni-Co-Fe-based end-of-life（EoL） superalloys, knowledge of their activity coefficients in slags is essential. In this study, the activity coefficients of NiO and CoO in CaO-Al_2O_3-SiO_2 slag, a candidate slag used for the EoL superalloy remelting process, were measured using gas/slag/metal equilibrium experiments. These activity coefficients were then used to consider the recycling efficiency of nickel and cobalt by remelting EoL superalloys using CaO-Al_2O_3-SiO_2 slag. The activity coefficients of NiO and CoO in CaO-Al_2O_3-SiO_2 slag both show a positive deviation from Raoult＇s law, with values that vary from 1 to 5 depending on the change in basicity. The activity coefficients of NiO and CoO peak in the slag with a composition near B =（%CaO）/（%SiO_2） = 1, where B is the basicity. We observed that controlling the slag composition at approximately B = 1 effectively reduces the cobalt and nickel oxidation losses and promotes the oxidation removal of iron during the remelting process of EoL superalloys.
