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Three-product flotation column and method suitable for high-ash fine-fraction coal slime

A fine-grained, three-product technology, used in flotation, solid separation, etc., to avoid losses, prevent short circuits, and improve the quality of clean coal products

Active Publication Date: 2021-02-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, based on the production status of the increasing fine sludge content of flotation feed and the difficulty of continuous efficient recovery by conventional flotation equipment, a kind of coal with strong recovery capacity, strong adaptability to coal quality, and high separation accuracy is especially suitable for high ash fine sludge. Separation of particle size coal slime, new flotation columns containing three products of clean coal, medium coal and gangue need to be developed urgently

Method used

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  • Three-product flotation column and method suitable for high-ash fine-fraction coal slime
  • Three-product flotation column and method suitable for high-ash fine-fraction coal slime
  • Three-product flotation column and method suitable for high-ash fine-fraction coal slime

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Embodiment

[0039] A three-product flotation column slime flotation procedure suitable for high-ash fine-grained coal slime recovery is as follows:

[0040] Before feeding the slurry to start the slime flotation, close the underflow pipe 14, fill the inner column with slurry, and fill the outer column with clear water, so that the slurry in the flotation column flows as shown by the arrow in the figure.

[0041] 1. The coal slime entering the foam layer is washed by the spray water 2, the vibration of the sieve plate 16 driven by the electromagnetic vibrator 6, and the coupling of the multi-layer annular inclined plate 3 effectively strengthen the desorption of the fine slime in the foam layer. The clean coal foam layer after desorbing the fine mud enters the clean coal collection tank 4 under the overflow action, and finally becomes the clean coal product a.

[0042] 2. The fine mud and some coarse particles falling on the inclined plate 3 slide quickly along the inclined plate 3 into th...

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Abstract

The invention relates to a three-product flotation column and method suitable for high-ash fine-fraction coal slime recovery, and belongs to the technical field of coal recovery. The three-product flotation column comprises an inner-layer column body and an outer-layer column body, the top of the inner-layer column body is provided with a clean coal collecting tank a and a feeding pipe, the periphery of the top of the outer-layer column body is provided with a clean coal collecting tank b, the bottom end of a feeding pipe is provided with a stepped jet device, and a flow baffle is arranged under the stepped jet device and in the inner-layer column body; the upper opening of the inner-layer column body is provided with a plurality of upper water spraying devices around the feeding pipe, thebottom of the inner-layer column body is provided with an L-shaped coarse grain recycling channel which is communicated with the outside of the inner-layer column body, and the clean coal collectingtank b and an outer-layer top water spraying device are arranged around the opening of the outer-layer column body; and a foam layer vibrating mechanism is arranged at the position below the clean coal collecting tank b on the same horizontal plane of the inner-layer column body and the outer-layer column body, an inclined flow distribution plate of an annular structure is arranged in the outer-layer column body, and an annular middling coal product collecting tank is reserved between the inclined flow distribution plate and the inner-layer column body. The three-product flotation column is high in recovery capacity, coal quality adaptability and separation precision.

Description

[0001] Technical field [0002] The invention relates to a three-product flotation column and method, in particular to a three-product flotation column and method suitable for high-ash fine-grained coal slime used in the technical field of mineral flotation. Background technique [0003] my country's energy structure is "rich in coal, poor in oil, and low in gas", which determines that coal will become the energy pillar of our country and will occupy the dominant position for a long time in the future. With the continuous increase of the degree of mechanized coal mining, the continuous deepening of mine mining, the continuous deterioration of the geological conditions of coal storage and the continuous promotion of hydraulic coal mining, a large amount of clay minerals represented by layered silicates in the coal seam are mixed into the raw coal. [0004] At present, the coal preparation plant commonly uses a classifying cyclone to classify the coal slime to a particle size of...

Claims

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Application Information

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IPC IPC(8): B03D1/02B03D1/14
CPCB03D1/025B03D1/14B03D1/1412
Inventor 刘金成代世琦邢耀文桂夏辉曹亦俊丁世豪刘秦杉包西程
Owner CHINA UNIV OF MINING & TECH
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