Microbubble swirl separation method and divice

Abstract

The invention discloses a micro-bubble rotational flow separation method and the separation equipment, and belongs to the flotation and the separation fields. The invention applies the principles of the air floating separation method and the swirl nozzle separation method, ore pulp preprocessed by a flotation agent passes through a bubble generator before entering a swirl nozzle, micro-bubble is added into the ore pulp, the bubble and the ore pulp collide and are mineralized, and a three-dimensional elliptic type strong rotating shear turbulent motion is generated after the mixed liquor tangentially enters the swirl nozzle from the periphery of the swirl nozzle with a certain pressure,. Because of the granularity difference (density difference) between the coarse grains (heavy phase) and the fine grains (light phase), the centrifugal force, the centripetal buoyancy force, and the fluid drag force are different, most of the coarse grains (heavy phase) are separated from the bubble and discharged from the bottom opening of the swirl nozzle under the action of centrifugal settling, and most of the fine grains (light phase) are carried by the bubble and discharged from an overflow pipe, thereby realizing the purposes of separation and grading. The micro-bubble rotational flow separation method has the advantages of simplified separation process and device and enhanced processing capacity.

Description

technical field [0001] The invention relates to a sorting method of mineral matter, which belongs to the field of sorting and flotation. It specifically relates to a microbubble swirling sorting method and sorting equipment. It is especially suitable for the separation of granular coal slime below 1.5mm. Background technique [0002] The method of introducing a large number of tiny bubbles into the water to make the substance to be separated adsorbed on the surface of the rising bubbles and float to the liquid surface, so that a certain component can be separated, is called air flotation separation method or bubble separation method. Also called flotation separation or froth flotation separation. The method is: when adding a surfactant to the aqueous solution containing ions and molecules to be separated, the polar end of the surfactant is connected with the ions or polar molecules in the water phase, and the non-polar end faces the air bubbles. The surfactant connects th...

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Problems solved by technology

[0008] 1. The foam of the flotation column adopts a self-overflow method. In order to ensure the fluidity of the flotation foam, it is necessary to increase the amount of foaming agent added, which not only affects the selectivity of the separation, but also causes the foam to be sticky to the subsequent dehydration operation. come difficult

[0009] 2. The nozzle diameter of the bubble generator of the flotation column is small (about 20mm), and it is easy to be blocked by sundries in the coal slurry, and the blockage is not easy to find, remove and replace

[0010] 3. The flotation column (bed) is usually used alone or in parallel, that is, single-stage flotation, so it is difficult to ensure both the quality of clean coal and the quality of tailing coal

[0011] 4. The processing capacity of the flotation column is small

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