Middings magnetic separator tailings classifying separation recovery system and middings magnetic separatortailings classifying separation recovery technology for dense medium coal preparation plant

Abstract

The invention relates to a middings magnetic separator tailings classifying separation recovery system and a middings magnetic separatortailings classifying separation recovery technology for a dense medium coal preparation plant. The system comprises a middings magnetic separator, a coal slime classifying device, a flotation unit and a coarse coal slime dewatering and recycling device, wherein the middings magnetic separator is connected with the coal slime classifying device; the coal slime classifying device is respectively connected with the flotation unit and the coarse coal slime dewatering and recycling device. The method comprises the steps of firstly, feeding dilute middings medium into the middings magnetic separator to carry out magnetic separation; feeding the middings magnetic separator tailings into the coal slime classifying device, and classifying according to the particle sizes of the middings magnetic separator tailings; after that, dividing the middings magnetic separator tailings into coarse fraction and fine fraction; feeding the middings magnetic separator tailings in the coarse fraction into the coarse coal slime dewatering and recycling device, feeding the middings magnetic separator tailings in the fine fraction into the flotation unit, and sorting and recovering fine-particle clean coal. After the system and the technology are adopted, under the condition of same quality indexes of the clean coal, the recovery rate of the clean coal can be improved, or the number of flotation units and the consumption of flotation reagent can be reduced, and the floatability of flotation fed material can be improved.

Description

technical field [0001] The invention relates to a fine-grained coal separation equipment and process, in particular to a medium coal magnetic separator tailings classification, separation and recovery system and process applied to a dense medium coal preparation plant. Background technique [0002] Dense medium cyclone coal preparation technology has been rapidly popularized and applied in coal preparation plants in recent years because of its remarkable advantages such as separation accuracy, high recovery rate of clean coal, and large single-machine processing capacity, and has become the most important choice for new coal preparation plants and The preferred technology for technical transformation of coal plants. [0003] See figure 2 , in a coal preparation plant using a three-product dense medium cyclone, the raw coal is sorted through the cyclone into three products: clean coal, medium coal and gangue, and fine-grained materials <0.5mm to 1.0mm in the three produ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that all the tailings of the coal magnetic separator in the dense medium coal preparation plant enter the tailings slime system, resulting in the loss of a large amount of high-quality clean coal lower than the lower limit of the separation of the dense medium cyclone, reducing the separation efficiency of the separation process. The economic benefits of the coal plant cause waste of valuable non-renewable coal resources; and when all of them enter the flotation system, the ash content of the flotation clean coal is high or the ash content of the flotation tailings is low, resulting in unqualified product quality and difficult flotation operations Increase and increase the number of flotation equipment and the consumption of flotation agents, thereby increasing the construction and production costs of the coal preparation plant. One is to provide a dense medium coal preparation plant. The recovery system, the second is to provide a method to firstly classify the tailings of the medium coal magnetic separator according to the lower limit particle size of gravity separation equipment, and then use different methods to sort and recycle according to the properties of materials of different particle sizes, so as to ensure the production of fine Under the condition that the quality of coal products remains unchanged, the process of classification, separation and recovery of coal magnetic separator tailings in dense medium coal preparation plants can greatly improve the recovery rate of clean coal

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