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首页> 外文会议>Environmental innovations in the metals industry for the 21st century >Making Effective Use of Natural Precipitation to Maintain Sulphide Bearing Tailings in a Saturated Condition
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Making Effective Use of Natural Precipitation to Maintain Sulphide Bearing Tailings in a Saturated Condition

机译：有效利用自然降水使含硫尾矿保持在饱和状态

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摘要

Exposed tailings deposits commonly lose by evaporation more than one-half of the annual burden of natural precipitation deposited on the tailings, mainly during the hot summer season. Evaporation permits ingress of oxygen to the deposit and the oxidation of sulphide minerals within the tailings resulting in generation of sulphuric acid and formation of soluble metal salts. Surface evaporation occurring during a drought cycle causes capillary migration of the metal salt solutions and accumulation of evaporated salts on the surface of the deposit. Dissolution of these salts in a subsequent precipitation event results in contaminated run-off from the deposit. The work described in this paper is directed to eliminating the oxidation of sulphides in the deposit, the migration of salts to surface and the need to treat effluent from the impoundment over a very extended period of time. The technique under development involves the establishment of a composite cover of inorganic minerals, of appropriate layer thickness, hydraulic properties and composition over the deposit in such a way that both evaporation and surface run-off are greatly reduced or eliminated. The system is also expected to be compatible with, benefit from and permit the efficient use of organic materials to further improve cover performance.
机译：暴露在尾矿中的沉积物通常会因蒸发而流失，这主要是在炎热的夏季期间，沉积在尾矿中的自然降水每年损失的一半以上。蒸发使氧气进入沉积物，并使尾矿中的硫化物矿物氧化，导致生成硫酸并形成可溶性金属盐。在干旱周期中发生的表面蒸发会导致金属盐溶液发生毛细管迁移，并使蒸发的盐积聚在沉积物表面。这些盐在随后的沉淀事件中的溶解导致沉积物的污染径流。本文所述的工作旨在消除沉积物中硫化物的氧化，盐类向表面的迁移以及在很长一段时间内处理蓄水所产生的废水的需求。正在开发的技术涉及在沉积物上建立具有适当的层厚度，水硬性和组成的无机矿物的复合覆盖物，从而大大减少或消除蒸发和表面径流。还期望该系统与有机材料兼容，受益并允许有机材料的有效使用，以进一步提高覆盖性能。

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