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Floating tail-coal graded recovering process

A technology of flotation tailing coal and process method, which is applied in the direction of solid separation, etc., can solve the problems of high viscosity, low price and high investment in infrastructure, and achieve good economic and social benefits, simple process and high efficiency.

Inactive Publication Date: 2007-08-29
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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  • Floating tail-coal graded recovering process

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Embodiment Construction

[0018] 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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Abstract

The invention relates to a technology method of flotation tailings classification recovery process, belongs to solid-liquid separation technology area, used to solve maximize recovery of flotation tailings issue. It uses classification Cyclone group to grade flotation tailings, the products moisture after dehydration is 14-18%, the particle size of recovery is 0.045-3mm, it occupy55-60% of floatation tailings quantity; the pressure filter recover fine fuel, the product after dehydration occupy 40-45% of floatation tailings quantity. The invention method filled the flotation tailings bank of use the technology at home and abroad, supplies a low input, high efficiency, simple process, a high degree automation of flotation tailings recovery method, has a simple system, low-moisture products, a bulk materials, can into the coal or other late Medium steam coal advantages. Six months can recover the investment, with 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 ...

Claims

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Application Information

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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
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