该研究表明,统计方法如何提供有关控制废弃尾矿库表面元素地球化学分布的因素和过程的信息。在这方面,进行了FunduMoldovei矿石加工厂产生的废物矿床的案例研究。该设施正在浓缩铜,Pb,和锌来自FunduMoldovei-LeSiluUrsului矿区(罗马尼亚)的多金属硫化物矿石。统计数据表明有三种类型的废物,显示特定属性:(i)海滩的浪费,富含可溶性部分(14.4%)和次生矿物质(例如,jarosite,亚铁磷灰石,硅云母,钾盐,和粘土矿物)。后者与相关的高Al含量,K,Fe,Co,Ni,Cu,Pb,和Zn受水分蒸发和随后作为水坑积累的渗滤液的瞬时pH(2.6-3.5)控制。较低的pH和稀缺的可溶性部分有利于铜和锌含量的上升,而Al,K,Fe,当可溶性部分丰富时,在较高的pH值下,Co和Co是明显的。(ii)上坝坡的废物,以强烈的氧化和从高酸性孔隙浸出液中沉淀的次生矿物质微薄的出现(平均pH值为2.55)为标志,即,jarosite,亚铁磷灰石,硅云母,还有Coquimbite.表面废物含有更多的黄铁矿,并且由于降雨过程中会去除细颗粒而变得更粗糙。与海滩垃圾不同,在上坝尾矿中,Al,K,Fe,Co,Cu,Pb,锌似乎主要与主要矿物(白云母,绿泥石,和黄铁矿)。(iii)下坡大坝废物的酸性(平均pH值为3.75)低于上坡;它包含在较高pH下稳定的次生矿物质(例如,石膏,apjohnite,Dietrichite,粘土矿物,和schwertmannite)。钙,Mn,大坝垃圾中Cd含量更高。它们来自初级和次级矿物(例如,白云母,绿泥石,石膏,亚铁磷灰石,和硅铁矿),并与较粗的废物相关。
The
study shows how the statistical approach can provide information on the factors and processes that control the geochemical distribution of elements at the surface of an abandoned tailings pond. In this regard, the case
study of a waste deposit resulting from the ore processing plant of Fundu Moldovei was carried out. The facility was concentrating Cu, Pb, and Zn from the polymetallic sulfide ores of the Fundu Moldovei-Leșu Ursului mining district (Romania). The statistics indicate three types of waste, showing specific properties: (i) Waste of the beach, rich in soluble fraction (14.4%) and secondary minerals (e.g., jarosite, ferricopiapite, magnesiocopiapite, pickeringite, and clay minerals). The latter and the related high contents of Al, K, Fe, Co, Ni, Cu, Pb, and Zn are controlled by the water evaporation and subsequent transient pH (2.6-3.5) of the leachates accumulated as puddles. The lower pH and scarce soluble fraction favor a rise in the Cu and Zn contents, while Al, K, Fe, and Co are noticeable at a higher pH when the soluble fraction is abundant. (ii) Waste of the upper dam slope, marked by intense oxidation and a meager occurrence of secondary minerals precipitated from highly acidic pore leachates (average pH of 2.55), namely, jarosite, ferricopiapite, magnesiocopiapite, and coquimbite. The surface waste contains more pyrite and is coarser because of the fine particle removal during rainfall. Unlike the beach waste, in the upper dam tailings, Al, K, Fe, Co, Cu, Pb, and Zn seem to relate mainly to the primary minerals (muscovite, chlorite, and pyrite). (iii) Downslope dam waste is less acidic (average pH of 3.75) than that of the upper slope; it contains secondary minerals stable at a higher pH (e.g., gypsum, apjohnite, dietrichite, clay minerals, and schwertmannite). Calcium, Mn, and Cd are more abundant in the dam waste. They originate from both primary and secondary minerals (e.g., muscovite, chlorite, gypsum, ferricopiapite, and magnesiocopiapite) and correlate with the coarser waste.