System and method for uniformly mixing filter-press coal-clay briquette and reselected coarse coal

Abstract

The invention relates to the technical field of uniform mixing of flotation concentrate and reselected fine coal, and particularly relates to a system and method for uniformly mixing filter-press coal-clay briquette and reselected coarse coal. The system comprises working systems as follows: a filter cake of a multi-segment open filter press shocks a rolling elastic connecting rod primary crushing device by virtue of self-weight to complete primary crushing; the primarily crushed material enters a double-layer scrapper; an upper layer of the double-layer scrapper is used for storing the material and a lower layer is used for continuously transporting the material through a scraper blade; the material enters a low-speed disk feeder and controls the discharge rate through adjusting the rotating speed and the opening degree of a feed opening; the material is crushed through a cutter tooth-type double-roll crusher and then falls to a total fine coal belt; a three-layer squirrel-cage mixer is arranged at the inclined lower part of a discharge end of the total fine coal belt to achieve uniform material mixing; and a guide plate is arranged at the discharge end of an upper warehouse belt to play a role in dispersing blanking points. The system is reasonable in process layout, equipment selection and structural design; the material is mixed uniformly; and the effect is reliable and stable.

Description

technical field [0001] The invention relates to the technical field of uniform mixing of flotation clean coal and heavy separation clean coal, in particular to a system and method for uniform mixing of pressure filter coal slime cake and gravity separation coarse coal. Background technique [0002] The flotation method is the most important interface separation method, which is generally used for the separation of -0.5mm coal slime, and is the only effective separation method for -0.1mm coal slime. The flotation effect is affected by many factors, such as the material composition and chemical composition of minerals, pulp preparation, flotation agent system, and the working conditions of flotation machines. Therefore, the ash content of flotation clean coal will fluctuate in a certain range. In order to ensure The quality (ash and moisture) of clean coal in the entire coal preparation plant meets the needs of users. Most coal preparation plants adopt the method of "back ash"...

AI Technical Summary

Problems solved by technology

Because most of the flotation concentrate foam is dehydrated and recovered by filter press, the filter cake of filter press slime has high viscosity and high water content, and usually agglomerates into cakes and is unloaded intermittently. Generally, crushing equipment is required to break and loosen it. In order to be evenly mixed into the coarse-grained clean coal of gravity separation; coal slime crushers are commonly used in coal preparation plants, such as the "tooth knife type coal product crusher and clean coal and slime cake crushing and mixing machine" disclosed in Chinese patent document CN104475211A method", using the crushing parts of the crusher to break and loosen the agglomerated coal slime, but there are the following problems: ① The filter press coal slime cake is not completely broken and loose, and there is a phenomenon of rebonding into lumps during the subsequent transportation process. ②The method is not perfect, it only provides the method of crushing and loosening the filter press coal slime cake, but ignores the problem of how to mix the crushed and loose material evenly with gravity-selected coarse-grained coal

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