Groundwater Quality Surroundings Mining Activities Areas in Arlit Region(Tim MersoïBasin,North Niger)

The study area is a semi-arid area located in the Arlit region.This area contains significant uranium deposits that have been mined by two mining companies since 1968.The objective of this study is to determine the impact of these activities on existing aquifers,in particular Izegouande aquifer.A methodological approach based on hydrochemical methods focusing on the analysis of nitrates and sulfates showed that waters of Izegouande aquifer have high nitrate concentrations ranging from 16 mg/L to 60 mg/L,higher than WHO(World Health Organization)standards drinking water.In addition,these waters show elevated sulfate levels ranging from 16 mg/L to 57 mg/L,therefore acceptable.These high concentrations of nitrates and sulfates are located mainly near wastewater treatment of Arlit city and near industrial zone,which are potential areas for transfer of these elements such as nitrates and sulfates.It is therefore urgent to carry out periodic and regular checks on groundwater in these areas.

对阿尔利特铀水冶厂浓酸浸出水冶工艺的评述

阿尔利特铀水冶厂是世界上第一座采用浓酸处理含有机物铀矿石并获成功的水冶厂。在简要介绍水冶工艺基础上,对该工艺流程进行了评述。该工艺具有硫酸用量比常规酸浸节省60%以上,铀浸出率提高5.0%以上,每t矿石出液量少等优点;缺点是干燥矿粉的制备、运输和加工过程中会产生扬尘,造成环境污染。评述的目的是为了对我国铀水冶工艺的研究有所借鉴。