The acid mine water demineralization apparatus consists of two concentric cylinders that are divided into a total of four sections; a water chamber, a gas chamber, a reaction zone, and an aeration zone. The water chamber transports acid mine water to the inlets of a plurality of the sharp edged orifices. The gas chamber receives ozone from an external source and sends it through a porous plate into the reaction zone, thus ensuring the gas is dispersed uniformly throughout the reaction zone. Water passing through the sharp edged orifices into the reaction zone reacts with the ozone to oxidize the insoluble metals in the water. Exiting the reaction zone, the water enters into the aeration zone where additional oxygen is added to the water and the agitation of the water is calmed before it enters a settling tank.