Svensson Margareta, Allard Bert
Man-Technology-Environment Research Centre, Orebro University, SE-701 82 Orebro, Sweden.
Waste Manag. 2008;28(3):597-603. doi: 10.1016/j.wasman.2007.02.031. Epub 2007 Jun 4.
A directive from the Swedish Government states that waste containing more than 1% of mercury shall be permanently deposited. The stabilization of mercury by conversion to a sparingly soluble compound like the sulphide is crucial to ensure long-term immobilization in a permanent storage. Immobilization by the solidification/stabilization (S/S) method and possible formation of HgS from mercury oxide or elemental mercury by reaction with a sulphur source (S or FeS) is investigated by a modified version of the NEN 7345 Dutch tank-leaching test. The diffusion of mercury during 11 months from 1-year-old mercury containing monoliths of Portland and slag cement is demonstrated. In a geologic repository under conditions representative of deep granitic bedrock (bicarbonate buffered to pH 8.6), a favourable monolith combination is slag cement with addition of the iron sulphide troilite. The apparent diffusion coefficient of mercury is estimated.
瑞典政府发布的一项指令规定，汞含量超过1%的废物应进行永久处置。通过转化为硫化物等微溶化合物来稳定汞，对于确保汞在永久储存中实现长期固定至关重要。采用荷兰NEN 7345储罐浸出试验的改进版本，研究了通过固化/稳定化（S/S）方法实现的固定化，以及氧化汞或元素汞与硫源（S或FeS）反应可能形成硫化汞的情况。展示了汞在11个月内从1年的含汞波特兰水泥和矿渣水泥块体中的扩散情况。在代表深部花岗岩基岩的条件（碳酸氢盐缓冲至pH 8.6）的地质处置库中，一种有利的块体组合是添加了硫化铁陨硫铁的矿渣水泥。估算了汞的表观扩散系数。
