Mixed flow field flotation system driven by jet stream

Abstract

The invention relates to the field of coal slurry flotation treatment, in particular to a mixed flow field flotation system based on jet flow drive. The system comprises a flotation tank and flotation stirring assemblies. Each flotation stirring assembly comprises a main shaft. An upper impeller and a lower impeller are arranged on each main shaft. Each main shaft is coaxially and sequentially sleeved with an inner sleeve and an outer sleeve outwards, and fit clearances exist between each main shaft, the corresponding inner sleeve and the corresponding outer sleeve. Suction pipes are arranged on the inner sleeves to form air channels. Coal slurry channels are formed by the fit clearances between the outer sleeves and the inner sleeves. Feeding nozzles are arranged on the upper impellers, the inlet ends of circulating feeding pipes are communicated with the flotation tank, and circulating pumps provide liquid pumping power for the circulating feeding pipes. Flow guide sleeves are coaxially fixed to the outer walls of the inner sleeves, flow guide blades are arranged in the flow guide sleeves in a circinate shape, and the rotating direction of mixed liquid guided by the flow guide blades is the same as that of the lower impellers. According to the mixed flow field flotation system, flotation energy consumption is low, the mixing effect of coal slurry and air is good, and meanwhile the flotation efficiency of existing coal slime flotation can be effectively improved.

Description

technical field [0001] The invention relates to the field of coal slurry flotation treatment, in particular to a mixed flow field flotation system driven by jet flow. Background technique [0002] Commonly used flotation machines are roughly divided into mechanical flotation machines and jet flotation machines. The disadvantage of the mechanical agitation flotation machine is that the air intake is small; the circulation of the pulp through the impeller is also small, so that its processing capacity is relatively small, and there is a stirring dead zone in the upper part of the stator. The disadvantage of the jet flotation machine is that the mixing power of the pulp and air is insufficient; the adaptability to the concentration of the pulp and the particle size is poor; there is a mixing dead zone around the central pulp feeding pipe. Since the above-mentioned flotation equipments have their own shortcomings in the working process, it is naturally difficult to achieve thei...

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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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