酸性矿山废水中石灰岩包壳作用研究

发布时间：2018-06-23 23:50

本文选题：硫化物尾矿 + 酸性矿山废水　；参考：《岩石矿物学杂志》2016年03期

【摘要】：研究石灰岩包壳作用有助于深入了解酸性矿山废水(AMD)在富含石灰岩的金属硫化物尾矿中的释放机制。采用AMD滞留浸泡石灰岩颗粒试料的实验方法,研究在酸水饱和条件下石灰岩次生包壳的形成作用。研究表明,AMD的Fe含量是影响石灰岩包壳作用的主因之一。在高Fe浓度(如1 029~1 033 mg/L)的AMD中,石灰岩颗粒表面可依次沉淀富Al相、石膏、纤铁矿(吸附Zn、Cu及As等),发生石灰岩包壳/钝化作用,使溶液维持酸性;而在低Fe浓度(6.71~74.8 mg/L)的AMD中,次生包壳难以生成,石灰岩得以大量溶解释碱并充分中和溶液中的H~+,使溶液达到中性。因此,Fe硫化物含量较高(如Fe含量10.62%、S含量5.70%)的石灰岩尾矿,由于其氧化后可生成高Fe浓度的酸性水而导致石灰岩包壳作用,具有释放AMD(及重金属)的危险,应注意防控。
[Abstract]:The study of limestone cladding is helpful to understand the release mechanism of acid mine wastewater (AMD) in metallic sulphide tailings rich in limestone. The formation of secondary cladding of limestone under the condition of acid water saturation was studied by the experimental method of marinating limestone particles by AMD. The results show that the Fe content of AMD is one of the main factors affecting limestone cladding. In AMD with high Fe concentration (such as 1 029 ~ 1 033 mg / L), limestone particles can be precipitated successively by Al rich phase, gypsum, fiberite (adsorption of Zn, Cu, as, etc.), and limestone cladding / passivation occurs, which keeps the solution acidic. In AMD with low Fe concentration (6.71 ~ 74.8 mg / L), the secondary cladding is difficult to form, and the limestone can explain the alkali in large quantities and neutralize the H ~ in the solution, which makes the solution neutral. Therefore, limestone tailings with high Fe sulphide content (such as 5.70% Fe 10.62U S), which can produce acidic water with high Fe concentration after oxidation, have the danger of releasing AMD (and heavy metals), which is dangerous to release AMD (and heavy metals).
【作者单位】：桂林理工大学地球科学学院;
【基金】：国家自然科学基金项目(41272394,40972220)~~
【分类号】：X751

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