Coal slime dehydration device and method by competitive adsorption

Abstract

The invention discloses an apparatus and a method for dewatering slime through competitive absorption. The apparatus comprises a slime concentrating machine, a first slurry pump, a buffering barrel, a second slurry pump, a drum-type mixer, a vibrating screen, a first belt transporter, a dryer, a cyclone dust collector, an induced draught fan, a second belt transporter, a buffering bin, a feeder and a third belt transporter. According to the method, strong-viscosity high-mud-content slurry, which is underflow of the slime concentrating machine, and a crowd of container bags filled with a drying medium are fully mixed, so that water in slime is competitively absorbed by the drying medium, and slime is indirectly dried; the mixture of water-reduced slime and the container-bag crowd is separated by the vibrating screen, the container-bag crowd is sent to a dryer for drying, and after regeneration, the container-bag crowd is sent to the buffering bin and is sent to the drum-type mixer by the feeder for recycling; and the dryer is connected with the cyclone dust collector for preparing a dewatered slime product. The dewatering efficiency of slime in coal preparation plants is effectively improved, and the economic value of low-rank slime is improved. The apparatus and the method are especially suitable for dewatering of strong-viscosity high-mud-content slime. The structure of the apparatus and the method are simple, easy to realize, good in dewatering effect, high in safety and low in operation cost.

Description

technical field [0001] The invention relates to a coal slime dewatering device and method, especially suitable for competitive adsorption of strong viscosity and high mud content in coal slime dewatering in coal preparation plants and the method. Background technique [0002] At present, wet coal preparation is the main coal separation method, and coal slime is an inevitable by-product in the coal preparation process, especially for low-rank power coal preparation plants such as lignite, long-flame coal, non-caking coal, and weakly caking coal. , there is generally a large amount of slime, and at the same time, the slime has a large amount of slime and strong viscosity. Coal preparation plants often use gravity dewatering and mechanical dewatering combined devices when processing this part of coal slime, that is, the coal slime water enters the coal slime thickener for gravity dehydration, and the underflow of the coal slime thickener goes to the chamber filter press for mec...

AI Technical Summary

Problems solved by technology

Coal preparation plants often use gravity dewatering and mechanical dewatering combined devices when processing this part of coal slime, that is, the coal slime water enters the coal slime thickener for gravity dehydration, and the underflow of the coal slime thickener goes to the chamber filter press for mechanical dehydration. However, due to coal Due to the characteristics of large mud content, fine particle size and strong viscosity, it is difficult for the plate and frame filter press to form a filter cake, the unloading time is long, and the work efficiency is low. The processing capacity of the filter press is limited, and the slime water cannot be effectively treated. , causing the "bulging belly" of the coal slurry water system in the coal preparation plant, because the coal preparation plant is a continuous process operation, which in turn affects other production links of the coal preparation plant

If coal slime is not dehydrated, it will be difficult to transport by vehicle or belt, let alone blended into fine coal products for sale

At the same time, the direct discharge of slime water into cultivated land or gullies, on the one hand, brings environmental pollution, and on the other hand, causes waste of coal resources, cultivated land and water resources, and also affects the economic and social benefits of thermal coal preparation plants.

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