Floating tail-coal graded recovering process
A technology of flotation tailings and process method, which is applied in the field of flotation tailings, can solve the problems of high viscosity, low price, high infrastructure investment, etc., and achieve good economic and social benefits, simple process and high efficiency
Inactive Publication Date: 2009-12-23
开滦(集团)有限责任公司煤业分公司
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Problems solved by technology
This method has a relatively simple process and is easy to realize closed-circuit washing water circulation. However, due to the high investment in the concentrator and the low processing capacity of the filter press, this traditional process has disadvantages such as low production efficiency, high operating costs, and high infrastructure investment. The product produced by the filter machine has high moisture content, high viscosity, and low price, which affects the economic benefits of the coal preparation plant
In addition, when there is too much coarse-grained slime in the tailing coal (+0.5mm exceeds 6-8%), it is easy to cause the central hole of the filter press to be blocked, the filter cloth to stick, difficult to unload, the filter cloth to be damaged, and the filtration capacity to be reduced , and even lead to concentrator crushing
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[0017] Its key point of the present invention is to carry out two-stage treatment after adopting hydrocyclone as classification by the one-stage treatment of flotation tailing coal of prior art, and the first stage mainly reclaims coarse coal slime (normally +200 order), The second section ensures the closed circuit of washing water and the concentration of circulating water. This method uses a hydrocyclone group as the classification equipment, and the particle size of the classification recovery can be adjusted according to the requirements of the first and second stages. Coarse coal slime is dehydrated by a screen decanter centrifuge, which can obtain lower moisture and be mixed with fine coal. Because most of the slime is recovered by the screen sedimentation centrifuge, only a small part of the fine slime needs to be treated by thickeners and filter presses, so the number of thickeners and filter presses is reduced, and their main function is to ensure clarified water and...
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The invention discloses a process method for staged recovery of flotation tailings, which belongs to the technical field of solid-liquid separation and is used to solve the problem of maximum recovery of flotation tailings. It utilizes classifying cyclone group to classify flotation tailings coal, and screen sedimentation centrifuge recovers coarse coal slime. After dehydration, the water content of the product is 14-18%, and the recovery particle size is 0.045-3mm, accounting for 10% of the flotation tailings. 55-60%; the filter press recovers fine coal slime, and the product after dehydration by the filter press accounts for 40-45% of the flotation tailings. The method of the present invention fills the blank of domestic and foreign use of this technology to treat flotation tailings, and proposes a low-input, high-efficiency, simple process, and high degree of automation recovery process for flotation tailings, which has the advantages of simple process system and low product moisture , The material is in bulk and can be mixed into the fine coal or other steam coal. The investment can be recovered within half a year, which has good economic and social benefits.
Description
technical field [0001] The invention relates to a method for treating flotation tailings, in particular to a method for classifying flotation tailings by using a classifying cyclone group and recovering them through different processes, belonging to the technical field of solid-liquid separation. Background technique [0002] Flotation is currently the most effective and commonly used method for fine-grained coal slime separation. According to the principle of effective utilization of coal resources, when the ash content of flotation tailings reaches more than 49%, it can be directly discarded as tailings. For difficult-to-float slime, especially when the ash content of flotation clean coal is low, it is difficult to meet this requirement in flotation tailings. At present, the ash content of flotation tailings in most coal preparation plants is not high, and it is still very high. use value. According to statistics, the flotation tailing coal produced by domestic key coal ...
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IPC IPC(8): B03B9/06
Inventor 李建光夏灵勇崔凤录刘太顺佟顺增张友军刘向东田立新朱天薇
Owner 开滦(集团)有限责任公司煤业分公司