2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 10: Battery, Recycling, Environmental, Mining
| Editors: | Kongoli F, Kumar V, Aifantis K, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 220 pages |
| ISBN: | 978-1-987820-54-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Dissolution Thermodynamics Analysis of CaSiO3 in the System of CaSiO3-NH3-NH4Cl-H2O
ZhiBo Tong1; Guo Jun Ma2; Feng Li3; Xiang Zhang4; ZhengLiang Xue4;1KEY LABORATORY FOR FERROUS METALLURGY AND RESOURCES UTILIZATION OF MINISTRY OF EDUCATION,WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, P.R. CHINA, 430081, WuHan, China; 2KEY LABORATORY FOR FERROUS METALLURGY AND RESOURCES UTILIZATION OF MINISTRY OF EDUCATION, WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY,WUHAN 430081, CHINATHE STATE KEY LABORATORY OF REFRACTORIES AND MET, wuhan, China; 3KEY LABORATORY FOR FERROUS METALLURGY AND RESOURCES UTILIZATION OF MINISTRY OF EDUCATION, WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Wuhan, China; 4THE STATE KEY LABORATORY OF REFRACTORIES AND METALLURGY, WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, WuHan, China;
Type of Paper: Regular
Id Paper: 47
Topic: 7
Abstract:
A novel economically process of extracting calcium from Electric Arc Furnace (EAF) slag in a microwave field by using recyclable NH4Cl solution and producing pure precipitate calcium carbonate was proposed. In order to improve the leaching rate of calcium, the calcium-bear phases in the EAF slag and its solubility in the system of NH3-NH4Cl-H2O were analyzed. As the dissolution of calcium from EAF slag is limited by the solubility of CaSiO3, the solubility behavior of CaSiO3 was studied according to the principles of simultaneous equilibrium and aqueous electronic charge neutrality in the system of Ca(II)-NH3-NH4Cl-H2O. The results show that the solubility of Ca(II) increases with the ammonium chloride concentration increasing and the highest solubility is about 0.5 mol/L, however, it decreases slightly with the ammonium hydroxide concentration increasing and the solubility is close to 0 mol/L in pure ammonium hydroxide solution. The equilibrium pH values of the leaching system are between 8.7 and 11.9. The forms of calcium presented in the system tend to be complexes instead of free ion with the increasing concentration of ammonium chloride and ammonium hydroxide.
Keywords:
Thermodynamics CaSiO3; Electric Arc Furnace; Mineral carbonation; Ammonia-ammonium chloride solutionReferences:
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