Separation of lead, copper, cadmium in iron tailings by CaCl2 chlorination roasting method
LI Riwen1,2,, CAI Haili1,2, NING Xunan1,2,,, BAI Xiaoyan1, LU Xingwen1,2, HONG Yanxiang1,2 1.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou 510006, China
Abstract:In order to separate lead, copper and cadmium from iron, aluminum, silicon and other oxides in iron tailings. Using CaCl2 as the chlorinating agent, the influence of temperature and CaCl2 content on the volatilization ratio of hazardous Pb, Cu, and Cd was investigated in the study. The basic characteristics and crystal structure of iron tailings were analyzed using X-ray fluorescence and X-ray diffraction et al. The results show that the contents of Pb, Cd and Cu in iron tailings are 2 230.04, 6.44 and 4 568.00 mg·kg?1, respectively. Sufficient chlorine content is the guarantee for chlorination roasting to remove Pb and Cd from iron tailings. Cu is more dependent on high temperature and CaCl2 addition. With the optimum chlorination roasting conditions at 1 000 °C with 10% of CaCl2, the volatilization ratio of Pb, Cd and Cu were 97.80%, 96.57% and 79.80%, respectively, and the main components of roasted slag have little change compared with iron tailings. Ca, S and SiO2 in iron tailings remain in the roasting slag in the form of CaSO4 and Ca2SiO4 after roasting in chlorination, while Cl hardly observed in the roasting slag. The leaching concentrations of heavy metals in the roasting slag is below the national standards (GB 5085.3-2007). Key words:iron tailings/ heavy metal/ chlorination roasting/ harmless/ solid waste.
图1铁尾矿高温热处理装置示意图 Figure1.Schematic diagram of high-temperature heat treatment device for iron tailings
MA B G, CAI L X, LI X G, et al. Utilization of iron tailings as substitute in autoclaved aerated concrete: Physico-mechanical and microstructure of hydration products[J]. Journal of Cleaner Production, 2016, 127: 162-171. doi: 10.1016/j.jclepro.2016.03.172
YE M Y, YAN P F, SUN S Y, et al. Bioleaching combined brine leaching of heavy metals from lead-zinc mine tailings: Transformations during the leaching process[J]. Chemosphere, 2017, 168: 1115-1125. doi: 10.1016/j.chemosphere.2016.10.095
[4]
SIRKECI A A, GUL A, BULUT G, et al. Recovery of Co, Ni, and Cu from the tailings of divrigi iron ore concentrator[J]. Mineral Processing and Extractive Metallurgy Review, 2006, 27(2): 131-141. doi: 10.1080/08827500600563343
[5]
WANG G W, NING X A, LU X W, et al. Effect of sintering temperature on mineral composition and heavy metals mobility in tailings bricks[J]. Waste Management, 2019, 93: 112-121. doi: 10.1016/j.wasman.2019.04.001
[6]
LI R F, ZHOU Y, LI C W, et al. Recycling of industrial waste iron tailings in porous bricks with low thermal conductivity[J]. Construction and Building Materials, 2019, 213: 43-50. doi: 10.1016/j.conbuildmat.2019.04.040
[7]
HU P, ZHANG Y H, ZHOU Y R, et al. Preparation and effectiveness of slow-release silicon fertilizer by sintering with iron ore tailings[J]. Environmental Progress & Sustainable Energy, 2018, 37(3): 1011-1019.
LI H Y, MA A Y, SRINIVASAKANNAN C, et al. Investigation on the recovery of gold and silver from cyanide tailings using chlorination roasting process[J]. Journal of Alloys and Compounds, 2018, 763: 241-249. doi: 10.1016/j.jallcom.2018.05.298
[11]
YU J, SUN L S, MA C, et al. Mechanism on heavy metals vaporization from municipal solid waste fly ash by MgCl2·6H2O[J]. Waste Management, 2016, 49: 124-130. doi: 10.1016/j.wasman.2015.12.015
[12]
FRAISSLER G, J?LLER M, MATTENBERGER H, et al. Thermodynamic equilibrium calculations concerning the removal of heavy metals from sewage sludge ash by chlorination[J]. Chemical Engineering and Processing: Process Intensification, 2009, 48(1): 152-164. doi: 10.1016/j.cep.2008.03.009
[13]
MATSUDA H, OZAWA S, NARUSE K, et al. Kinetics of HCl emission from inorganic chlorides in simulated municipal wastes incineration conditions[J]. Chemical Engineering Science, 2005, 60(2): 545-552. doi: 10.1016/j.ces.2004.07.131
[14]
NOWAK B, WEGERER H, ASCHENBRENNER P, et al. Sewage sludge ash to phosphate fertilizer by chlorination and thermal treatment: Residence time requirements for heavy metal removal[J]. Environmental Technology, 2012, 33(19/20/21): 2375-2381.
OROSCO P, RUIZ M D C, GONZáLEZ J. Synthesis of cordierite by dolomite and kaolinitic clay chlorination. Study of the phase transformations and reaction mechanism[J]. Powder Technology, 2014, 267: 111-118. doi: 10.1016/j.powtec.2014.07.009
[18]
ZHAI X J, FU Y, ZHANG X, et al. Intensification of sulphation and pressure acid leaching of nickel laterite by microwave radiation[J]. Hydrometallurgy, 2009, 99(3/4): 189-193. doi: 10.1016/j.hydromet.2009.08.006
[19]
WANG S J, HE P J, LU W T, et al. Comparison of Pb, Cd, Zn, and Cu chlorination during pyrolysis and incineration[J]. Fuel, 2017, 194: 257-265. doi: 10.1016/j.fuel.2017.01.035
NOWAK B, PESSL A, ASCHENBRENNER P, et al. Heavy metal removal from municipal solid waste fly ash by chlorination and thermal treatment[J]. Journal of Hazardous Materials, 2010, 179(1/2/3): 323-331. doi: 10.1016/j.jhazmat.2010.03.008
[23]
ADAM C, PEPLINSKI B, MICHAELIS M, et al. Thermochemical treatment of sewage sludge ashes for phosphorus recovery[J]. Waste Management, 2009, 29(3): 1122-1128. doi: 10.1016/j.wasman.2008.09.011
[24]
NOWAK B, PERUTKA L, ASCHENBRENNER P, et al. Limitations for heavy metal release during thermo-chemical treatment of sewage sludge ash[J]. Waste Management, 2011, 31(6): 1285-1291. doi: 10.1016/j.wasman.2011.01.029
[25]
NOWAK B, FRíAS ROCHA S, ASCHENBRENNER P, et al. Heavy metal removal from MSW fly ash by means of chlorination and thermal treatment: Influence of the chloride type[J]. Chemical Engineering Journal, 2012, 179: 178-185. doi: 10.1016/j.cej.2011.10.077
[26]
KURASHIMA K, MATSUDA K, KUMAGAI S, et al. A combined kinetic and thermodynamic approach for interpreting the complex interactions during chloride volatilization of heavy metals in municipal solid waste fly ash[J]. Waste Management, 2019, 87: 204-217. doi: 10.1016/j.wasman.2019.02.007
[27]
任松彦. 城市生活垃圾在焚烧过程中的重金属迁移特性研究[D]. 广州: 华南理工大学, 2013.
[28]
FRAISSLER G, J?LLER M, BRUNNER T, et al. Influence of dry and humid gaseous atmosphere on the thermal decomposition of calcium chloride and its impact on the remove of heavy metals by chlorination[J]. Chemical Engineering and Processing: Process Intensification, 2009, 48(1): 380-388. doi: 10.1016/j.cep.2008.05.003
[29]
KANARI N, ALLAIN E, JOUSSEMET R, et al. An overview study of chlorination reactions applied to the primary extraction and recycling of metals and to the synthesis of new reagents[J]. Thermochimica Acta, 2009, 495(1/2): 42-50. doi: 10.1016/j.tca.2009.05.013
1.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou 510006, China Received Date: 2020-02-18 Accepted Date: 2020-10-26 Available Online: 2021-03-24 Keywords:iron tailings/ heavy metal/ chlorination roasting/ harmless/ solid waste Abstract:In order to separate lead, copper and cadmium from iron, aluminum, silicon and other oxides in iron tailings. Using CaCl2 as the chlorinating agent, the influence of temperature and CaCl2 content on the volatilization ratio of hazardous Pb, Cu, and Cd was investigated in the study. The basic characteristics and crystal structure of iron tailings were analyzed using X-ray fluorescence and X-ray diffraction et al. The results show that the contents of Pb, Cd and Cu in iron tailings are 2 230.04, 6.44 and 4 568.00 mg·kg?1, respectively. Sufficient chlorine content is the guarantee for chlorination roasting to remove Pb and Cd from iron tailings. Cu is more dependent on high temperature and CaCl2 addition. With the optimum chlorination roasting conditions at 1 000 °C with 10% of CaCl2, the volatilization ratio of Pb, Cd and Cu were 97.80%, 96.57% and 79.80%, respectively, and the main components of roasted slag have little change compared with iron tailings. Ca, S and SiO2 in iron tailings remain in the roasting slag in the form of CaSO4 and Ca2SiO4 after roasting in chlorination, while Cl hardly observed in the roasting slag. The leaching concentrations of heavy metals in the roasting slag is below the national standards (GB 5085.3-2007).
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