Chemical composition and minerals in pyrite ash of an abandoned sulphuric acid production plant
Chemical composition and minerals in pyrite ash of an abandoned sulphuric acid production plant
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DOI：
10.1016/j.scitotenv.2012.04.046
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发表时间：
2012-07-15
影响因子：
9.8
通讯作者：
Silva, Luis F. O.
中科院分区：
文献类型：
--
作者：
Oliveira, Marcos L. S.;Ward, Colin R.;Silva, Luis F. O.
硫的提取产生一种富含赤铁矿的废物，称为焙烧黄铁矿灰，其中含有大量对环境敏感的元素，其浓度和存在方式各不相同。虽然已经研究了与铁或铜矿开采相关的焙烧硫铁矿灰的矿物学，因为这是全世界硫的主要来源，但煤衍生的焙烧硫铁矿灰中的矿物学，更重要的是亚微米、超细和纳米颗粒的表征仍有待解决。在这项工作中，我们提供了必要的数据焙烧黄铁矿灰的化学成分和纳米矿物组合。XRD，HR-TEM和FE-SEM被用来识别大量的各种矿物的人为来源。这些相是在巴西南部的煤黄铁矿加工过程中发生的高度复杂的化学反应的结果，用于硫磺提取和进一步制造硫酸。富铁的亚微米级、超细级和纳米级火山灰中可能含有高比例的砷、硒、铀等有毒元素。还有其他的许多元素，如As，Cr，Cu，Co，La，Mn，Ni，Pb，Sb，Se，Sr，Ti，Zn和Zr，被发现以高达5%的浓度存在于单个纳米颗粒和亚微米，超细和纳米矿物（例如氧化物，硫酸盐，粘土）中。从煤炭废弃物的焙烧黄铁矿灰中的纳米矿物的研究是重要的，以发展对这种副产品的性质的理解，并评估排放的纳米矿物，超细颗粒，和大气气体，雨水或体液之间的相互作用，从而评估黄铁矿灰材料的环境和健康影响。(C)2012爱思唯尔有限公司版权所有。
The extraction of sulphur produces a hematite-rich waste, known as roasted pyrite ash, which contains significant amounts of environmentally sensitive elements in variable concentrations and modes of occurrence. Whilst the mineralogy of roasted pyrite ash associated with iron or copper mining has been studied, as this is the main source of sulphur worldwide, the mineralogy, and more importantly, the characterization of submicron, ultrafine and nanoparticles, in coal-derived roasted pyrite ash remain to be resolved. In this work we provide essential data on the chemical composition and nanomineralogical assemblage of roasted pyrite ash. XRD, HR-TEM and FE-SEM were used to identify a large variety of minerals of anthropogenic origin. These phases result from highly complex chemical reactions occurring during the processing of coal pyrite of southern Brazil for sulphur extraction and further manufacture of sulphuric acid. Iron-rich submicron, ultrafine and nanoparticles within the ash may contain high proportions of toxic elements such as As, Se, U. among others. A number of elements, such as As, Cr, Cu, Co, La, Mn, Ni, Pb, Sb, Se, Sr, Ti, Zn, and Zr, were found to be present in individual nanoparticles and submicron, ultrafine and nanominerals (e.g. oxides, sulphates, clays) in concentrations of up to 5%. The study of nanominerals in roasted pyrite ash from coal rejects is important to develop an understanding on the nature of this by-product, and to assess the interaction between emitted nanominerals, ultra-fine particles, and atmospheric gases, rain or body fluids, and thus to evaluate the environmental and health impacts of pyrite ash materials. (C) 2012 Elsevier B.V. All rights reserved.