电解锰废渣的浸出毒性及生石灰固化技术

发布时间：2018-05-02 16:16

本文选题：锰渣 + 浸出毒性　；参考：《环境工程》2017年12期

【摘要】：我国电解锰废渣产量大,污染物的浸出毒性较强。锰渣堆放方式粗放,渣库管理落后,且长期暴露在自然环境中,导致大量污染物迁移到周边的土壤及水体中。为了解决锰渣的无害化处理问题,在分析其浸出毒性的基础上,研究了生石灰固化技术对锰渣的浸出毒性的影响。结果表明:锰渣中的主要污染物为可溶性Mn~(2+)和NH_4~+-N,含量极高,严重超标;利用生石灰的吸附、包裹及化学反应作用,能有效将可溶性Mn~(2+)固化为难溶Mn O_2,同时将NH_4~+-N转化为气态NH_3,浸出液中污染物浓度均符合相关标准要求;当生石灰添加量为10%,锰渣含水率为27%,预搅拌时间40 min,预静置时间3 d,锰渣浸出液中可溶性Mn~(2+)浓度降为2.60 mg/L,固化率达99.8%,低于5.0 mg/L的标准限值;NH_4~+-N浓度降为21.23 mg/L,脱除率为96.73%,低于25 mg/L的标准限值。
[Abstract]:The output of electrolytic manganese waste residue in China is large and the leaching toxicity of pollutants is strong. Because of the extensive storage mode of manganese slag, the management of slag reservoir is backward, and it is exposed to the natural environment for a long time, which results in a large number of pollutants migrating to the surrounding soil and water body. In order to solve the problem of innocuous treatment of manganese slag, on the basis of analyzing its leaching toxicity, the influence of quicklime curing technology on leaching toxicity of manganese slag was studied. The results show that the main pollutants in manganese slag are soluble Mn~(2) and NH4- N, which are extremely high and seriously exceed the standard, and the adsorption, encapsulation and chemical reaction of quicklime are used. Soluble Mn~(2) can be used to solidify difficult-soluble MnO _ 2, at the same time, NH _ 4-N can be converted into gaseous NH _ 3, and the concentration of pollutants in the leachate meets the requirements of relevant standards. When the content of quicklime is 10, the water content of manganese slag is 27, the pre-agitation time is 40 minutes, and the presetting time is 3 days, the concentration of soluble Mn~(2 in the leaching solution of manganese slag decreases to 2.60 mg / L, the solidification rate is 99.8%, and the standard limit of 5.0 mg/L is lower than the standard limit of 5.0 mg/L, the concentration of NH _ 4 ~ -N decreases to 21.23 mg / L, and the concentration of NH _ 4 ~ -N decreases to 21.23 mg / L in the leaching solution of manganese slag. The division rate was 96.73, below the standard limit of 25 mg/L.
【作者单位】：重庆工程职业技术学院;中国环境科学研究院;
【基金】：国家水体污染控制与治理科技重大专项(2009ZX07529-005) 科技部2010年科研院所技术开发研究专项资金(2010EG166314) 国家科技支撑计划(2012BAF03B03)
【分类号】：X781.1

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