Combined slurry mixing equipment for fine coal difficult to float

Abstract

The invention relates to the field of pretreatment of coal slurry, in particular to combined slurry mixing equipment for fine coal difficult to float. The equipment comprises a mixing box and a main rotary shaft, wherein an electric field activation layer, an ultrasonic oscillation layer and a turbulent mixing and stirring layer are sequentially arranged in an inner cavity of the mixing box from top to bottom; at least one pair of driven rotary shafts is symmetric to the axis of the main rotary shaft; a driven gear is coaxially arranged at the shaft end of the top of each driven rotary shaft; stirring wheels are arranged at shaft ends of the driven rotary shafts, and a stirring impeller is arranged at the shaft end of the main rotary shaft. The equipment further comprises a pressurizing air-dissolving box, an air inlet pipe is arranged in a box body of the pressurizing air-dissolving box, and a feeding partition board is arranged at the inlet end of the box body and seals the inlet end through an extension spring; a discharge partition board is arranged at an outlet end of the box body and seals the outlet end through a compression spring. The equipment can perform a very good tempering function on floated coal slime and especially meets the slurry mixing and quality improving requirement of fine coal difficult to float, the work efficiency is high, and the pre-treatment process is quick and convenient.

Description

technical field [0001] The invention relates to the field of coal slurry pretreatment, in particular to a combined slurry mixing equipment for difficult-to-separate fine-grained coal for slurry-scaling and upgrading of high-ash, refractory fine-grained coal slime. Background technique [0002] Because the buoyancy of coal slime in our country is generally poor, coal slurry pretreatment is an indispensable link in the flotation coal preparation process, and it is a prerequisite for the flotation machine to obtain good technical and economic indicators. The necessity of coal slurry pretreatment mainly includes the following four points: 1) Fully disperse the flotation agent (non-polar oil collector and foaming agent), the flotation agent of coal slime is insoluble or slightly soluble in water, Only by fully dispersing it into a large number of tiny droplets can it be uniformly mixed into the coal slurry; 2) Mix the dispersed flotation agent well into the floating coal slurry, ...

AI Technical Summary

Problems solved by technology

As a relatively advanced coal slurry pretreatment device in the field, the flotation agent droplets are an order of magnitude smaller than the emulsified and dispersed droplets, and the dispersion effect is better; The dispersing effect of the medicine is achieved by the rotation of the fogging disc, which often requires a closed box to form a closed space to avoid the meaningless drift of the mist medicine, but the formation of the closed environment often causes problems such as fogging The working environment of the disc is poor, so it is easy to send product failures, it is impossible to realize the intuitive observation of the slurry mixing process, and it is difficult to find out the faults in time, which brings troubles to the on-site operation and maintenance work; in addition, the high-speed rotating fogging disc, The requirements for the speed of the drive motor are too high, that is, a secondary motor with a speed of up to 3000 rpm must be used to ensure its working performance, which poses severe challenges to the actual assembly, purchase and maintenance costs.

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