Cause Analysis And Treatment Measures Of Acidic Water Accumulation In Maoming Oil Shale Open-pit Mine

The purpose of this study is to conduct a typical and targeted investigation of acidity of water in the mining area left behind after mining in the open-pit mining area of Maoming City,Guangdong Province,and conduct research on soil and water pollution repair to obtain acidity in the open-pit mine area of Maoming City.The best method for water treatment provides a scientific basis for the restoration of water and soil pollution in large-scale waste mining areas.Through ground survey,unmanned ship surface surveying,water sampling experiment,soil sampling experiment,laboratory simulation experiment,etc.,this paper proposes neutralization sedimentation,engineering coverage and intercepting ditch blocking method for the status of acid water in Maoming City open-pit mine.Three methods are combined to study the management of acidic water in pits.The main conclusions of this study are as follows:The alkali neutralization precipitation method can effectively improve the low p H value of the existing accumulated water in the open pit mine.The hydrodynamic module Delft3D-Flow core module simulates the threedimensional dynamics and material transportation conditions of the water body,and calculates that the concentration is 30.Under the condition of % Na OH,the West Lake can be completely mixed for about 30-40 days,and the water quality can reach the three types of surface water standards after mixing.The Dongji Shui Lake is mixed for about 7-9 days.After mixing,the water quality can reach the three types of surface water standards.Tailings dam and waste rock yard are one of the main sources of acidic water.The rainwater flows through the surface to dissolve acidic substances.The engineering cover technology is used to reduce the concentration of oxygen in the tailings to slow down the oxidation rate of the sulfide ore.Improve the acidic surface environment and promote the restoration of vegetation in the mining area.The use of intercepting ditch to block surface rainwater from entering open pits and blocking the entry of acidic water bodies can achieve significant results in a short period of time,but the intercepting ditch drains rainwater into the downstream Xiaodongjiang River,which has an impact on the water quality of Xiaodongjiang River,but with the quality of the pit water The improvement of the ecological environment and the improvement of the ecological environment.After the rectification of the open pit mine,the water storage can be gradually replenished to Xiaodongjiang River and gradually improve the water quality of the Xiaodongjiang River.In summary,for the selection of water treatment schemes for open pit mines in Maoming City,it is necessary to jointly control the water body and soil to restore the p H of the acid water while controlling the source of acid water,and finally reach the p H of the open pit water.