ã€China Aluminum Industry Network】 The formation of mine water is generally due to the uncovering of the roadway due to the subsidence of the goaf area and the water source. It can be divided into pure mine water, mine water containing suspended matter, high salinity mine water, and acid mine water. There are five types of special polluted mine water. It has the characteristics of groundwater, but the mountain is subject to artificial pollution, and there are some characteristics of surface water.
In foreign countries, after many countries have properly dealt with mine water, some of them have reached the discharge standard and are discharged into the surface water system. The other part of the water is recycled to the industrial water supply and the mine well water of the beneficiation (coal) plant. At present, the use of neutralization method and pre-aeration method is more effective. A surfactant that inhibits the activity of iron-plated bacteria has been developed to inhibit the growth of iron-promoting bacteria, and an artificial wetland method has been used to treat acidic mine water. The techniques adopted for mine water treatment generally include solid-liquid separation technology, neutralization method, oxidation treatment, reduction method, ion exchange method, and the like.
Folding knife, a kind of knife, can be folded. The folding knife is mainly connected with a knife body which can be rotated into by a pivot assembly at the front end of the handle. The knife body is provided with a safety buckle relative to the side of the knife body, and an elastic strip relative to the back end of the knife body. The back end of the knife body is provided with a stop part and a stop concave part which can be butted by the elastic strip, and the safety buckle has a tilted elastic buckle part, The elastic strip is arranged in the holding chamber of the handle, one end of which is fixed, and the other end of which is connected with the stop part of the tool body, so as to provide the thrust to assist the rotation of the handle when the tool body is rotated out of the handle, In addition to the simple semi-automatic operation mode of turning out and positioning by using the elastic auxiliary push knife body, the overall thickness of the folding knife is reduced by the refined and simplified structural design, which is convenient for the collection and carrying of the folding knife and makes the operation of the folding knife easier.
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