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Physical and chemical characteristics of slag produced during Pb refining and the environmental risk associated with the storage of slag
Environmental Geochemistry and Health ( IF 3.2 ) Pub Date : 2020-10-13 , DOI: 10.1007/s10653-020-00738-5
Alicja Kicińska 1
Affiliation  

Metallurgical waste originating from the Zn and Pb refining process presents varying chemical composition and physical properties and contains varying quantities of pollutants. In the study, both fresh and weathered samples of production slag from the final Pb refining process were used to determine its physical parameters and chemical composition as well as to perform an environmental risk assessment (RAC, mRAC) related to its storage. This paper focuses on determining parameters such as natural humidity (1.8%) and bulk density (1267 kg/m3) of the slag. Also, its toxicity was analysed using bio-tests, its pH was measured (11.92) and the content of sulphates (3.5 wt%), chlorides (0.3 wt%) and selected heavy metals (Cd, Cu, Fe, Mn, Zn, Pb) was determined. The Individual Contamination Factor was determined, yielding the following order of the hazard level: Pb > Cu > Zn > Cd > Fe > Mn. Based on the mobility of metals determined using the Mobility Factor, it was concluded that the hazard level followed the sequence Cd > Pb > Zn > Mn > Fe > Cu. The obtained water leaching results were compared to the values found in the legal regulations in force. Based on this comparison, it was established that the slag studied constitutes toxic waste containing considerable quantities of sulphides and chlorides. The material is also a considerable source of readily leaching elements (Cd, Zn and Pb), and thus any product created using the slag may become hazardous to the environment. Also, the waste studied must not be used in the form in which it is currently stored due to the leaching of particularly toxic elements (Cd and Pb) in water solutions with increasing acidity.



中文翻译:

铅精炼过程中产生的炉渣的理化特性以及与炉渣储存有关的环境风险

源自锌和铅精炼工艺的冶金废料具有不同的化学成分和物理性质,并且包含不同数量的污染物。在这项研究中,使用来自最终铅精炼过程的新鲜和风化生产渣样品来确定其物理参数和化学成分,并进行与其存储有关的环境风险评估(RAC,mRAC)。本文着重于确定诸如自然湿度(1.8%)和堆积密度(1267 kg / m 3)的参数。)的炉渣。此外,使用生物测试分析了其毒性,测量了其pH值(11.92),并检测了硫酸盐(3.5 wt%),氯化物(0.3 wt%)和选定的重金属(Cd,Cu,Fe,Mn,Zn, Pb)已确定。确定了单个污染因子,得出危害等级的以下顺序:Pb> Cu> Zn> Cd> Fe> Mn。根据使用迁移率确定的金属迁移率,可以得出结论,危害等级遵循以下顺序:Cd> Pb> Zn> Mn> Fe> Cu。将获得的水浸出结果与现行法律法规中的值进行比较。根据这种比较,可以确定所研究的炉渣是含有大量硫化物和氯化物的有毒废物。该材料也是容易浸出元素(镉,锌和铅)的重要来源,因此,使用矿渣产生的任何产品都可能对环境造成危害。而且,由于酸度不断增加的水溶液中特别有毒的元素(镉和铅)的浸出,所研究的废物不得以当前的储存形式使用。

更新日期:2020-10-13
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