Treatment method for acid mine water metal ion resource recovery based on low cost

Abstract

The invention discloses a treatment method for acid mine water metal ion resource recovery based on low cost, which comprises the following steps: step 1, purification of acid mine water: the acid mine water is pumped into purification equipment for purification work, and in the purification process, the metal ions in the acid mine water are precipitated step by step in a successive precipitation manner; a large number of metal ions such as Al, Fe, Mg and Mn contained in the acid mine water are selectively removed, and sediments which are high in purity and can be recycled are obtained. Different metal precipitates are selectively removed, the sediments which are high in purity and can be recycled are obtained, the number of solid wastes formed in the acid mine water treatment process is greatly reduced, even solid-waste-free mode operation is achieved, the cost required by solid waste retreatment and the total operation cost of the acid mine water purification process can be greatly reduced, and according to the overall purification requirement, resource recycling can be selectively carried out on all or part of metal precipitates according to the water quality condition and the value of precipitation resources.

Description

technical field [0001] The invention relates to the technical field of water treatment, and more specifically, to a treatment method based on low-cost acid mine water metal ion resource recovery. Background technique [0002] China is rich in coal resources, mainly based on underground mining. After the coal seam is mined, a goaf is formed. The goaf that has stopped mining and the recession period of surface movement and deformation has ended will become an old goaf, and the old goaf will become a space where groundwater gathers. The sulfide minerals in the coal seam undergo a series of physical and chemical reactions in the oxidizing environment and under the action of microorganisms. The reacted substances dissolve in water and gather in the old empty area. The accumulated water circulates slowly, showing the characteristics of acid mine water. Many springs in northern China have coal Symbiosis, coupled with the high openness of the karst system, the water ecological envir...

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Problems solved by technology

[0003] The traditional idea of ​​terminal treatment of acidic mine water includes combined processes such as adding alkali to neutralize, aeration and oxidation, and wetland treatment. The amount of sedimentation is large, and the cost of comprehensive treatment is high. Due to the differences in the occurrence of geological conditions in different regions, metals in acidic mine water There are also relatively large differences in ion types and concentrations, and different treatment processes have certain applicability. The neutralization method generally uses CaO as a neutralizing agent, which has the disadvantages of large amount of sediment and easy scaling. The existing treatment methods cannot To achieve the selective separation and removal of metal deposits in mine water, and no recyclable deposits can be obtained

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