Methods of arsenic wastes recycling: Focus on flotation
Methods of arsenic wastes recycling: Focus on flotation
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DOI：
10.1016/j.molliq.2015.11.028
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发表时间：
2016-02
影响因子：
6
通讯作者：
G. Kyzas;K. A. Matis
中科院分区：
文献类型：
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作者：
G. Kyzas;K. A. Matis
今天，水中的砷对许多国家的人们的健康构成了严重威胁。此外，含砷矿物(如毒砂和其他脉石矿物)的氧化风化和溶解，以及在地表或地下水中迁移的溶解无机砷氧阴离子，随后可被土壤和沉积物颗粒吸附。同时，去除砷，即从尾矿中去除砷，可以使它们适合回收利用，从而实现可持续性。几个世纪以来，水一直被工业视为理所当然的制造工具，因为它便宜而充足。浮选是一种独特的分选技术，最初起源于矿物选矿。为了配合浮选，通常需要进行具体的研究：例如测量颗粒的电动行为、与气泡的接触角、所研究体系的水相形态以及一般的化学；因为适当的表面活性剂、起泡剂、抑制剂和改性剂的存在有助于有效的分离过程。本工作的另一个重点是经济方面，可能是回收有用的有价值的矿物(即黄金)，在回收的同时促进环境技术和废水处理。例如，富含砷的含金黄铁矿精矿通常储存在矿区，如果金与毒砂有关(如目前所研究的情况)，则可进一步富含砷，以协助金的选矿。除砷是通过吸附来完成的，包括生物吸附、浮选等，也可能是与下游膜分离相结合的过程。
Arsenic in water poses today a serious threat to the health of people in many countries. Also, oxidative weathering and dissolution of As-containing minerals (such as arsenopyrite and other gangue minerals), among other, of dissolved inorganic arsenic oxyanions that are transported in surface or groundwater, can subsequently become adsorbed on soil and sediment particles. The removal of arsenic, i.e. from mine tailings, could meanwhile render them suitable for recycling and hence, sustainability. For centuries, water has been a manufacturing tool that industry has taken for granted, because it was inexpensive and plentiful. Flotation, being a unique separation technique, initially originated from mineral beneficiation. In line with flotation, specific investigations are usually required: such as measurements of the particles' electrokinetic behavior, contact angle with the gas bubbles, aqueous speciation of the studied system and in general, chemistry; as the presence of the appropriate surfactants, frothers, depressants and modifiers help the efficient separation process. Another focus of the present work constitutes the economic aspect may be of the recovery of useful valuable minerals (i.e., gold), contributing to recycling meanwhile with environmental technology and wastewater treatment. For instance, arsenic-rich auriferous pyrite concentrates, often stockpiled in the mine area, could be further enriched in arsenic to assist also Au beneficiation, in case gold is associated with arsenopyrite (as it is the case studied in the present). Such arsenic removal is accomplished by sorption, including biosorption, flotation etc. and perhaps, a combined process with membranes separation downstream, too.