从工业鼓泡流化床锅炉底灰和粉煤灰中浸出重金属评价环境风险（英文）

发布时间：2018-01-03 05:43

本文关键词：从工业鼓泡流化床锅炉底灰和粉煤灰中浸出重金属评价环境风险（英文）　出处：《Transactions of Nonferrous Metals Society of China》2016年01期 　论文类型：期刊论文

【摘要】：在鼓泡流化床锅炉(296 MW)中混合燃烧木渣和泥煤产生的底灰和粉煤灰中含有石英(SiO_2)、微斜长石(KAlSi_3O_8)和钠长石(NaAlSi_3O_8)。X射线衍射不能区分从底灰和粉煤灰中释放的相关重金属。为了评估不同环境条件下底灰和粉煤灰中重金属的释放情况,根据BCR工艺将底灰和粉煤灰中的重金属依次萃取和分离成酸性可溶/可交换(CH_3COOH)、可还原(NH_2OH-HCl)和可氧化(H_2O_2/CH_3COONH_4)相,利用冰醋酸萃取组分和重金属总浓度计算从底灰和粉煤灰中浸出重金属的风险评价指数。浸出研究表明,从底灰和粉煤灰中萃取的不同组分中重金属量不同。从环境和利用前景来看,底灰和粉煤灰中的重金属具有不同水平环境污染风险,只有底灰中的砷呈现非常高的风险。底灰中高风险金属是镉,而粉煤灰中的是砷、镉和硒。
[Abstract]:In a bubbling fluidized bed boiler (296MW), the bottom ash and fly ash produced by mixed combustion of wood slag and peat contain quartz SiO2). Microplagioclase KAlSi3O8) and albite / NaAlSi3OS). X ray diffraction can not distinguish the heavy metals released from bottom ash and fly ash. In order to evaluate the release of heavy metals from bottom ash and fly ash under different environmental conditions. According to BCR process, heavy metals in ash and bottom ash were extracted and separated into acidic soluble / exchangeable CH3COOH. The reducible NH2OH-HCl) and the oxidized H2O-hs _ 2O _ _ _. The risk assessment index of heavy metals leaching from ash and fly ash was calculated by using acetic acid extraction components and total concentration of heavy metals. The contents of heavy metals in different components extracted from bottom ash and fly ash are different. From the perspective of environment and utilization prospects, heavy metals in bottom ash and fly ash have different levels of environmental pollution risk. Only arsenic in the bottom ash presents a very high risk. The high risk metal in the bottom ash is cadmium, while in fly ash it is arsenic, cadmium and selenium.
【作者单位】： Department
【分类号】：X705;X820.4
【正文快照】： mobility of metals in waste[3,4],because these1 Introductionproperties are basically dependent on the differentchemical forms of binding between the metals and solidEnergy generation from biomass fuels such as cleanphases of the sample[4].Availability,mo

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