High-ash fine coal slime separation equipment and method

Patent metadata

Field	Value
Publication number	US-2021268518-A1
Application number	US-201917252741-A
Country	US
Kind code	A1
Filing date	Apr 22, 2019
Priority date	Jan 31, 2019
Publication date	Sep 2, 2021
Grant date	—

Abstract

Disclosed is high-ash fine coal slime separation equipment and method, applicable to the field of coal washing. The high-ash fine coal slime separation equipment includes a feeding system ( 1 ), a mineralization system ( 2 ), a separation system ( 3 ) and a pulsating water flow control system ( 4 ). A coal slime mineralization region is isolated from a separation region; and a damping block and a pulsating water flow device are arranged in a mineral separation system. A flotation feeding is fed into the feeding system ( 1 ), slurry mixing operation is completed, coal slime enters the mineralization system after pulp mixing to generate turbulent collision to form mineralized bubbles, the mineralized bubbles enters the separation system ( 3 ) after passing through a turbulent-flow dissipation pipe ( 12 ), and meanwhile, pulsating water flow with a certain frequency and waveform is fed into the separation system ( 3 ) by the pulsating water flow control system ( 4 ).

First claim

1 . High-ash fine coal slime separation equipment, comprising a feeding system, a mineralization system, a separation system and a pulsating water flow control system which are connected sequentially through pipelines, wherein
the feeding system comprises a stirring barrel with a stirring motor on top, wherein materials at a discharging port at the bottom of the stirring barrel are pressurized by a pump to be fed into the mineralization system; the mineralization system comprises a bubble generator, a mineralization chamber and a turbulent-flow dissipation pipe, wherein an inlet of the bubble generator is connected to an outlet pipeline of the pump, and an outlet of the bubble generator is connected to a feeding port below the mineralization chamber; the separation system comprises a damping pulsating water flow type flotation column and an air compressor, wherein the damping pulsating water flow type flotation column is of a columnar structure, an air inlet connected to an outlet of the air compressor is formed at a bottom of the damping pulsating water flow type flotation column, and a clean coal overflow tank is arranged at the top of the damping pulsating water flow type flotation column; the pulsating water flow control system comprises a water tank, a variable-frequency pump, a PID control cabinet and a pressure gauge, wherein a water outlet of the water tank is connected to an inlet of the variable-frequency pump, an outlet of the variable-frequency pump is connected to the separation system through a pipeline, the pressure gauge is arranged on a pipeline between the variable-frequency pump and the separation system, and the PID control cabinet is in circuit connection to the variable-frequency pump and controls work of the variable-frequency pump; wherein the damping pulsating water flow type flotation column is of a column-structure and is internally divided into a clean coal concentration region, an active pulse flow region, a damping pulsation region, an air flotation scavenging region and an inflation chamber; wherein the clean coal concentration region is the clean coal overflow tank arranged at a top end of the columnar structure, the active pulse flow region comprises an annular pulsating water flow pipe surrounding the damping pulsating water flow type flotation column, the annular pulsating water flow pipe is provided with a plurality of jet orifices to enable clean water to uniformly wash a foam layer in the separation process so as to effectively reduce mechanical covering phenomenon and reduce an ash content of clean coal, a flotation column feeding port is formed in a connecting portion of the damping pulsation region and the air flotation scavenging region, the damping pulsation region is provided with a plurality of damping blocks on an inner side wall of the damping pulsating water flow type flotation column, the damping blocks are of triangular structures and are uniformly arranged at a periphery of the damping pulsation region in a shell of the damping pulsating water flow type flotation column, an upper part of the air flotation scavenging region is provided with a flotation assisted baffle inclining downwards at a position of a surface opposite to the flotation column feeding port, the flotation assisted baffle prevents ore pulp from entering the damping pulsating water flow type flotation column to directly collide with an opposite column wall so as to reduce a desorption probability of coarse particles and improve flotation stability, an lower part of the air flotation scavenging region is provided with a tail coal opening on a side wall, a bottom of the inflation chamber is connected to an inlet of the air compressor, and one or more layers of microporous ceramic plates are arranged between a top of the inflation chamber and the air flotation scavenging region.

2 . The high-ash fine coal slime separation equipment according to claim 1 , wherein an included angle between the flotation assisted baffle and the damping pulsating water flow type flotation column is 15° to 60°.

3 . The high-ash fine coal slime separation equipment according to claim 1 , wherein the microporous ceramic plate has a pore diameter of 5 μm to 100 μm; and in the separation process, the microporous ceramic plate generates a large number of microbubbles by input air and prevents an ore pulp solution in the damping pulsating water flow type flotation column from entering the air compressor.

4 . The high-ash fine coal slime separation equipment according to claim 1 , wherein a cylinder body of the mineralization chamber is a cyclone shell, wherein multiple layers of damping disks are arranged in the mineralization chamber, a feeding port tangent to the mineralization chamber is formed in a middle lower part of the mineralization chamber, an accident discharging pipe with a control valve is arranged on a lower part of the mineralization chamber, and a mineralization chamber discharging port tangent to the mineralization chamber is formed in an upper part of the mineralization chamber.

5 . The high-ash fine coal slime separation equipment according to claim 1 , wherein a turbulent-flow dissipation pipe is arranged between the mineralization chamber discharging port of the mineralization chamber and the flotation column feeding port of the damping pulsating water flow type flotation column, the turbulent-flow dissipation pipe internally comprises a plurality of steel pipes, the steel pipes are welded into a bundle in pairs, a cross section of the bundle is quasi-circular, and each of the steel pipes has a diameter of 5 mm to 6 mm and a length of 15 mm to 25 mm.

6 . A separation method using the high-ash fine coal slime separation equipment according to claim 1 , comprising the following steps:
a. starting the air compressor and inflating the damping pulsating water flow type flotation column through the microporous ceramic plate; starting the variable-frequency pump and adjusting a frequency of the variable-frequency pump by the PID control cabinet so as to adjust a pulsating water flow frequency and an amplitude: the higher the content of high ash in the coal slime is, the greater the pulsating water frequency and the amplitude are, on the contrary, the smaller the pulsating water flow frequency and the amplitude are; closing an accident discharging pipe of the mineralization chamber; b. feeding flotation coal slime and medicaments into the stirring barrel to mix uniformly to generate an ore pulp mixture, feeding the ore pulp into the bubble generator under an effect of the pump, enabling the ore pulp mixture to suck air under a negative pressure generated under a jet flow action of the bubble generator and crushing the air to be mixed into the ore pulp mixture to form jet ore pulp; c. enabling the jet ore pulp to continuously move downwards to the mineralization chamber, generating a strong turbulent flow effect under an action of a centrifugal force field of the mineralization chamber and the damping disk, performing efficient collision and adhesion between particles and bubbles in the jet ore pulp to form a gas-solid-liquid three-phase ore pulp body, discharging the three-phase ore pulp body from a mineralization chamber discharging port, enabling the discharged three-phase ore pulp body to enter the turbulent-flow dissipation pipe and then enter the damping pulsating water flow type flotation column from the flotation column feeding port after eliminating vortex in the three-phase ore pulp by a plurality of small steel pipes in the turbulent-flow dissipation pipe; d. performing static separation after the three-phase ore pulp enters the damping pulsating water flow type flotation column, changing a flow velocity of the ore pulp when the ore pulp passes through the damping block, enabling one part of coarse clean coal

Assignees

• Univ China Mining

Inventors

• Gui Xiahui
• Xing Yaowen
• Yang Zili
• Cao Yijun
• Liu Jiongtian
• Xia Lingyong
• Liu Taishun
• Tong Shunzeng

Classifications

• B03D1/245

  Injecting gas through perforated or porous area · CPC title

• B03D1/085

  of the feed, e.g. conditioning, de-sliming · CPC title

• B03D1/02

  Froth-flotation processes · CPC title

• B03D1/247 Primary

  Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type · CPC title

• B01D2221/02

  Small separation devices for domestic application, e.g. for canteens, industrial kitchen, washing machines · CPC title