Case project of ecological restoration of a nonferrous metal mine in Guangxi

This paper introduces an example of ecological restoration project of a nonferrous metal mine in Guangxi, and through site investigation and risk assessment, determines the mine pollution status, engineering repair quantity and repair target are determined by site investigation and risk assessment.Firstly, the engineering repair technique is determined, and the categoryⅠgeneral industrial solid wastes are dealt with a method of situ barrier landfill in the site directly; and the categoryⅡgeneral industrial solid wastes are repaired by a solidification/stabilization technology to meet the requirements of categoryⅠgeneral industrial solid waste, then the wastes are dealt with a method of ectopic barrier landfill in a landfill.Secondly, engineering application parameters are determined by small test and pilot test with the method of solidification/stabilization, such as the B-MSM increase is 3%, the soil moisture content is 35% and the mixing residence time is 5 min, which ensures the quality of the repair project but also reduces the repair cost.Finally, in order to achieve the mine ecological re-green, the plants which have the tolerance of heavy metals are selected in the basis of the local plant varieties, to build a plant system with arbors, shrubs and grass.The success of this project provides reference for other similar mine ecological restoration.