Thermal decomposition characteristics of mercury compounds in industrial sludge with high sulfur content
- 105 Downloads
Sludge generated from metal smelting processes may contain a large amount of mercury with high sulfur content. A sludge roasting technology could be used to recover mercury from such sludge. Thermo-gravimetric analysis was employed to investigate the thermal decomposition properties of mercury and mass in the sludge. At elevated temperatures ranged from 200 to 650 °C at interval of 25 °C, total mass losses of sludge and mercury decomposition from the sludge containing over 2000 ppm of mercury were experimentally investigated. At temperatures of 200–325 °C, the decomposition rate of mercury from the sludge was very low and then the decomposition was taken place very rapidly from 350 to 575 °C. As the discrete mercury decomposition data at elevated temperatures were smoothened by least square method, the kinetic parameters of mercury decomposition reaction were determined for two different temperature zones. The decomposition of mercury could be correlated with thermal mass degradation of the sludge experimented. By comparing derivative thermo-gravimetric results for mercury in the sludge with high sulfur content and pure mercury compound species, HgS and Hg2SO4 were found to be the dominant form of mercury in the sludge due to high content of sulfur.
KeywordsMercury Sulfur-containing sludge Roasting technology Thermal decomposition Kinetics
This research was supported by Korea Ministry of Environment for the project of "Advanced Technology Program for Environmental Industry" and it was also supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20164030201250).
Compliance with ethical standards
Conflict of interest
The authors declare the there is no conflict of interest.
- 1.U.S. EPA Office of Air Quality Planning & Standards and Office of Research and Development (1997) Mercury study report to congress, U.S. EPA, Washington, DCGoogle Scholar
- 2.European Commission (2001) Ambient air pollution by mercury (Hg)-position paper. Office of Official Publications of the European Communities, LuxembourgGoogle Scholar
- 3.UNEP (2013) Minamata convention on mercury text and annexes. UNEP, Nairobu, KenyaGoogle Scholar
- 4.UNEP, ISWA (2015) Practical sourcebook on mercury waste storage and disposal DT/1873/GE. UNEP, GenevaGoogle Scholar
- 7.Narvaes DM (2013) Development of a practical sourcebook on mercury storage and disposal. Global mercury partnership 3rd waste management partnership area meeting, Manila, PhilippinesGoogle Scholar
- 11.Hugli TE, Moore S (1972) Determination of the tryptophan content of proteins by ion exchange chromatography of alkaline hydrolysates. J Biol Chem 247:2828–2834Google Scholar
- 12.Ritter JA, Bibler J (1992) Removal of mercury from waste water: large-scale performance of an ion exchange process. Water Sci Technol 25:165–172Google Scholar
- 14.Easterly CE, Vass AA, Tyndall RL (1997) Method for the removal and recovery of mercury. Martin Marietta Energy Systems Inc., Oak RidgeGoogle Scholar
- 27.Sedlar M, Pavlin M, Popovič A, Horvat M (2015) Temperature stability of mercury compounds in solid substrates. Open Chem 13:404–419Google Scholar
- 30.U.S. EPA (1994) Mercury in solid or semisolid waste (manual cold-vapor technique) method 7471A. U.S. EPA, Washington, DCGoogle Scholar
- 36.WHO (2003) Elemental mercury and inorganic mercury compounds: human health aspects Concise International Chemical Assessment Document 50. World Health Organization, GenevaGoogle Scholar
- 40.CTI Reviews (2016) Principles of general chemistry, Cram101 TextbookGoogle Scholar
- 43.Davis ME, Davis RJ (2013) Fundamentals of chemical reaction engineering. Dover Publications, New YorkGoogle Scholar