Theoretical Analysis and Practical Exploration on Ecological Restoration of Mines with Multi-source Solid Wastes: Example from Yulin City, Shaanxi Province

Mine environmental restoration and the comprehensive utilization of solid waste are two ecological issues that are highly concerned by the whole society at present. Based on the idea of "theoretical analysis−case study−collaborative governance", taking Yulin, Shaanxi Province as an example, this paper comprehensively analyzes the policy advantages, technical feasibility and market potential of multi-source solid waste collaborative mine ecological restoration on the basis of systematic analysis of the current situation of industrial solid waste and mine ecological restoration. Secondly, based on the multi-source solid waste modification of structure, nutrition and environmental function, a soil conditioner was prepared. Finally, through the practical exploration of applying soil conditioner to sand treatment, saline alkali land improvement and soil ecological restoration of mine waste dump, it is found that the average increase of above−ground biomass of plants in sand land, saline alkali land and waste dump after applying soil conditioner is 50.3%, 36.0% and 39.9% respectively. The present manuscript may provide scientific support for the coordinated ecological restoration of multi-source solid wastes in northern energy cities.