Use Skills of Polyacrylamide to Treat Coal Mine Sewage
The types of polyacrylamide are diversified, and according to the content of polyacrylamide, these types are subdivided into various types, which are used in different fields. However, why do coal mine sewage choose anionic polyacrylamide? Today we will explain to you why.
In the process of ore washing in mining plants, the precipitation and filtration of mineral powder and slime are the main economic problems and pollution control problems. Anionic polyacrylamide series products can reduce soil coloring, pipeline blockage, pump maintenance and river water pollution, and improve Production capacity, can also make water thoroughly clarified, can homogenize metal precipitation, and, among many types of flocculants, low cost, in coal mine plants, water treatment filtration is also ideal.
Anionic polyacrylamide (PAM) forms bridges by absorbing many fine particles or oil droplets in mine sewage through its long chain of polymer, and it is a flocculant with very strong flocculation ability. The flocculation speed of PAM is faster than that of non-ionic PAM. It is usually used in conjunction with polyaluminum chloride. Before use, the optimum dosage should be determined through experiments. Concentration, PAM not only does not play a flocculation role, but disperses it.
Therefore, the coal mined in coal mining can increase the separation efficiency of coal and impurities by adding flotation agents, the clean coal is floated out, the tailing coal is settled, and then the clean coal in the tailing coal can be recovered by sedimentation, filtration or centrifugation , polyacrylamide is used in the sedimentation process to promote solid-liquid separation, and then sent to the thickener, the clear water is recovered from the overflow of the thickener and recycled, and the powdery clean coal is recovered through filtration and centrifugation. The flocculant is added again to improve the separation efficiency. In order to meet the needs of users, we have produced a special flocculant for coal washing, which has a better effect on different coal mines and greatly reduces the dosage of chemicals. A large amount of flocculants are usually used in the mining industry. After the water, it is often necessary to recover useful solids in the water, and to purify and recycle the waste water.
Anionic polyacrylamide for mine sludge sedimentation, anionic flocculant, can promote the sinking of solids, clarification of liquids and dehydration of mud cakes, thereby improving production efficiency, reducing tailings loss and water consumption, and reducing equipment investment and processing cost, and avoid environmental pollution, the main reason is that when anionic polyacrylamide contacts with particulate coal or coal colloid, it can effectively neutralize the electrical properties of the coal surface, and effectively reduce the surface energy, so that the particles Coal precipitates after coagulation. Users who have used this product know that the molecular weight is between one million and the molecular weight should be selected according to the slime water.
Coal washing wastewater is the industrial tail water of coal mine wet coal washing process, which contains a large amount of coal slime and silt, which has caused serious pollution to the environment near the mining area. Coal washing wastewater has become one of the main sources of pollution in the coal industry and has become more and more popular. People pay attention to the fact that coal washing wastewater is particularly stable, and it will not settle naturally after standing for a few months, so it is very difficult to treat. my country has carried out research work in this area since the 1960s, but no effective treatment method has been developed. In recent years, the treatment method of coagulation precipitation with lime (or carbide slag), polyacrylamide and polyaluminum chloride has been proposed in China, and the research results have been widely used.
The bridging and coagulation of polyacrylamide is mainly realized by the charges carried on its longer molecular chains, which enhances the surface binding strength of the initial particles, thereby increasing the internal binding force of the group and densifying it. In addition, It is also very important to determine the dosing position of polyacrylamide. Dosing directly in the coagulation column can realize the attachment of the initial particles on the surface of the nuclei flocs one by one, and form a dense coal slime group under a certain stirring intensity. increase, the binding strength increases, and the internal binding force increases. The initial particles and the aggregates are combined in a tight manner to make the aggregates dense. With the increase of the agent, SSt begins to decline rapidly. In the experiment, it can be observed that the turbid wastewater When the dosage reaches 1.1mg/L, the supernatant suddenly clarifies and the flocs sink quickly, which improves the treatment efficiency.
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