CN212383873U

CN212383873U - Flotation tailing coal slime echelon decrement system

Info

Publication number: CN212383873U
Application number: CN202020568191.2U
Authority: CN
Inventors: 曾庆刚; 李振成; 李延奇; 李永凡; 吕佳伟; 吴二东
Original assignee: Eight Coal Preparation Plant Pingdingshan Tianan Coal Mining Co ltd
Current assignee: Eight Coal Preparation Plant Pingdingshan Tianan Coal Mining Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2021-01-22
Anticipated expiration: 2030-04-16

Abstract

A flotation tailing coal slime echelon decrement system comprises a first-section high-efficiency thickener used for carrying out primary concentration treatment on flotation tailing coal, an FBS tailing coal feeding device used for adding FBS tailing coal into underflow treated by the first-section high-efficiency thickener, a first dehydration recovery mechanism used for carrying out recovery treatment on the underflow mixed with the FBS tailing coal, a second-section thickener used for carrying out secondary concentration treatment on overflow of the first-section high-efficiency thickener, a concentration grading swirler used for carrying out three-stage concentration grading treatment on the underflow of the second-section thickener, and a second dehydration recovery mechanism and a third dehydration recovery mechanism respectively used for carrying out recovery treatment on two kinds of grain products generated after grading treatment by the concentration grading swirler; the utility model discloses can carry out multistage fractional concentration with the flotation tail coal, reduce the coal slime volume step by step, reduce filter-pressing, stoving link pan feeding volume.

Description

Flotation tailing coal slime echelon decrement system

Technical Field

The utility model belongs to the technical field of the flotation tail coal is retrieved, especially, relate to a flotation tail coal echelon decrement recovery system.

Background

The coal slime is a byproduct generated in the washing process of a coal preparation plant, the main component of the coal slime is tailing generated in the flotation operation, the granularity is 0-0.5mm, and the ash content is generally 45-60%.

With the improvement of mining mechanization degree and the continuous decline of raw coal properties, the coal slime amount generated in the coal washing process is increased, and the treatment of the flotation tail coal becomes the difficulty of each coal preparation plant. The coal slime treatment link is often a key factor that the coal slime water treatment process is not suitable for production requirements, so that the coal slime is accumulated in the circulating water, vicious circulation is realized, and the production is restricted in serious cases.

The traditional treatment processes of the coal slime are generally two. One process is as follows: the flotation tail coal is concentrated and precipitated by a thickener under the condition of adding a precipitator, and then is subjected to filter pressing and dehydration by a filter press to form a coal slime filter cake which can be directly sold or sold after being dried. The second process comprises the following steps: the flotation tail coal is firstly cut into coarse coal by a first-section thickener under the condition of not adding a precipitator, and the coarse coal is recovered into middling coal with higher value by a sedimentation filter centrifuge after the natural precipitation of materials with the diameter of 0.15-0.5 mm; and (3) feeding the residual 0-0.15mm material after coarse filtration by the first-stage thickener into a second-stage thickener for concentration and precipitation, performing pressure filtration and dehydration by a filter press to obtain a coal slime filter cake, and directly selling the coal slime filter cake or drying the coal slime filter cake for sale.

Although the filter press is a special device for recovering fine coal slime, the filter press has small single machine processing capacity, filter cakes after filter pressing and dehydration have high moisture content, are easy to be bonded into clusters, have poor loose property and cannot be directly mixed into middlings.

Secondly, according to the requirement of environmental protection policy, the air dust emission amount limits the drying treatment of the coal slime. In addition, because natural gas resources are gradually deficient, the use of the natural gas is limited in individual time intervals of production enterprises, and the price of the natural gas is high, the drying processing capacity of the coal slime is severely restricted, and if the amount of the coal slime needing to be dried is large, the production cost of the enterprises is increased.

In conclusion, the shortage of the coal slime water treatment system serving as a key process of the coal preparation plant seriously affects the production, and cannot meet increasingly strict environmental protection management and control, necessary technical transformation is required to be carried out, and the quantity of coal slime needing filter pressing and drying is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the weak point among the prior art, provide a flotation tailing echelon decrement recovery system, can carry out multistage fractional concentration with the flotation tailing, reduce the coal slime volume step by step, reduce filter-pressing, stoving link pan feeding volume.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a flotation tail coal gradient reduction recovery system comprises a first-stage high-efficiency thickener used for carrying out primary concentration treatment on flotation tail coal, an FBS tail coal feeding device used for adding FBS tail coal into underflow treated by the first-stage high-efficiency thickener, a first dehydration recovery mechanism used for carrying out recovery treatment on the underflow mixed with the FBS tail coal, a second-stage thickener used for carrying out secondary concentration treatment on overflow of the first-stage high-efficiency thickener, a concentration and classification cyclone used for carrying out three-stage concentration and classification treatment on the underflow of the second-stage thickener, and a second dehydration recovery mechanism and a third dehydration recovery mechanism which are respectively used for carrying out recovery treatment on two kinds of grain fraction products generated after classification treatment of the concentration and classification cyclone.

The first dehydration recovery mechanism comprises an FBS tailing dehydration sieve connected with the FBS tailing feeding device, an oversize medium removal object and an oversize water of the FBS tailing dehydration sieve respectively enter a first centrifugal machine and a middle gangue classification cyclone through pipelines, a centrifugal liquid of the first centrifugal machine enters the middle gangue classification cyclone through the pipelines, a bottom flow port and an overflow port of the middle gangue classification cyclone are respectively connected with a coarse coal slime dehydration sieve and a two-stage thickener through the pipelines, and the undersize water of the coarse coal slime dehydration sieve enters the middle gangue classification cyclone through the pipelines.

The second dehydration recovery mechanism comprises a middling medium removal sieve and a second centrifuge, a bottom flow pipe of the concentration classification cyclone is connected with a feeding port of the middling medium removal sieve, oversize medium removal objects and undersize water of the middling medium removal sieve respectively enter the second centrifuge and the middling waste classification cyclone through pipelines, and centrifugal liquid of the second centrifuge enters the middling waste classification cyclone through a pipeline.

The third dehydration recovery mechanism comprises a filter press, the filter press is connected with a dryer, and filtrate of the filter press enters a two-stage thickener through a pipeline.

The underflow pipe and the overflow pipe of the first-stage high-efficiency thickener are respectively connected with the FBS tail coal feeding device and the second-stage thickener, and the feeding port and the overflow pipe of the second-stage thickener are respectively connected with the dosing device and the circulating water tank.

Adopt above-mentioned technical scheme, the utility model has the advantages of as follows:

1. the utility model discloses merge one section high-efficient concentrated quick-witted underflow and FBS tail coal, improved the material degree of consistency. The bottom flow mixed with the FBS tail coal enters an FBS tailing dewatering screen for medium removal, and the oversize medium removal matter of the FBS tailing dewatering screen enters a first centrifugal machine for treatment to obtain a medium coal product, so that first-level reduction is realized; after entering a medium-waste classification cyclone for classification, feeding materials for a coarse coal slime dewatering screen, performing dehydration treatment on the coarse coal slime dewatering screen to obtain a medium coal product, entering the screen water of the coarse coal slime dewatering screen into the medium-waste classification cyclone, and overflowing and guiding the medium-waste classification cyclone into a two-stage thickener for treatment to realize primary recovery;

2. performing secondary concentration treatment on the primary concentrated overflow by a secondary concentrator, enabling the clarified secondary concentrator overflow to enter a circulating water pool to be used as coal dressing circulating water, and enabling the secondary concentrated underflow to enter a concentration grading cyclone to perform tertiary concentration treatment; after the underflow of the concentration grading cyclone enters a middling medium removing sieve for treatment, the oversize medium removing material is treated by a second centrifugal machine to obtain a middling product, so that secondary decrement is realized; introducing undersize water of the middling medium removing sieve and centrifugal liquid of a second centrifugal machine into a middling gangue classification cyclone to realize secondary recovery; the concentrated grading cyclone overflows into a filter press to be filtered and dehydrated into a coal slime filter cake, the coal slime filter cake is treated by a dryer to obtain dry coal slime, and filtrate of the filter press is introduced into a two-stage thickener to be treated to realize secondary recovery;

3. to sum up, the utility model effectively relieves the environmental protection pressure caused by the overlarge coal slime output, the system can carry out multi-section grading concentration on the flotation tail coal, reduces the coal slime amount step by step, reduces the feeding amount of the filter pressing and drying links, greatly reduces the drying cost and improves the economic benefit; meanwhile, the consumption of the medicament is reduced, and the production cost is greatly reduced.

Drawings

Fig. 1 is a schematic flow chart of the apparatus of the present invention.

In the figure: the system comprises a 1-section high-efficiency thickener, a 2FBS tailing coal feeding device, a 3-section thickener, a 4-concentration grading cyclone, a 5FBS tailing dewatering screen, a 6-first centrifugal machine, a 7-middling gangue grading cyclone, an 8-coarse coal slime dewatering screen, a 9-middling coal medium-removing screen, a 10-second centrifugal machine, a 11-filter press, a 12-dryer, a 13-dosing device and a 14-circulation water tank.

Detailed Description

As shown in fig. 1, the utility model discloses a flotation tail coal echelon decrement recovery system, including be used for carrying out one section high-efficient concentrator 1 of one-level concentrated processing to the flotation tail coal, be used for to the process FBS tail coal pan feeding device 2 that adds FBS tail coal in the underflow that one section high-efficient concentrator 1 was handled, be used for mixing have the underflow of FBS tail coal carries out recovery processing's first dehydration recovery mechanism, is used for carrying out two-stage concentrator 3 of second grade concentrated processing to one section high-efficient concentrator 1 overflow, is used for carrying out the concentrated hierarchical swirler 4 of tertiary concentrated hierarchical processing to two-stage concentrator 3 underflow and is used for respectively carrying out recovery processing to the process two kinds of grain grade products that produce behind the hierarchical processing of concentrated hierarchical swirler 4 carry out recovery processing's second dehydration recovery mechanism and third dehydration recovery mechanism.

The first dehydration recovery mechanism comprises an FBS tailing dehydration screen 5 connected with the FBS tailing feeding device 2, oversize medium removal materials and undersize water of the FBS tailing dehydration screen 5 respectively enter a first centrifugal machine 6 and a middle gangue classification cyclone 7 through pipelines, centrifugal liquid of the first centrifugal machine 6 enters the middle gangue classification cyclone 7 through pipelines, a bottom flow port and an overflow port of the middle gangue classification cyclone 7 are respectively connected with a coarse coal slime dehydration screen 8 and a two-stage thickener 3 through pipelines, and undersize water of the coarse coal slime dehydration screen 8 enters the middle gangue classification cyclone 7 through pipelines.

The second dehydration recovery mechanism comprises a middlings medium-removing sieve 9 and a second centrifuge 10, the underflow pipe of the concentration grading cyclone 4 is connected with the feeding port of the middlings medium-removing sieve 9, oversize medium-removing substances and undersize water of the middlings medium-removing sieve 9 respectively enter the second centrifuge 10 and the middlings grading cyclone 7 through pipelines, and centrifugal liquid of the second centrifuge 10 enters the middlings grading cyclone 7 through a pipeline.

The third dehydration recovery mechanism comprises a filter press 11, the filter press 11 is connected with a dryer 12, and the filtrate of the filter press 11 enters the two-stage thickener 3 through a pipeline.

An underflow pipe and an overflow pipe of the first-section efficient thickener 1 are respectively connected with the FBS tail coal feeding device 2 and the second-section thickener 3, and a feeding port and the overflow pipe of the second-section thickener 3 are respectively connected with a dosing device 13 and a circulating water tank 14.

The utility model discloses the during operation: the flotation tail coal automatically flows into a section of high-efficiency thickener 1 without adding a medicament to carry out primary concentration treatment, the bottom flow of the section of high-efficiency thickener 1 enters an FBS tail coal feeding device 2 to be combined with the FBS tail coal, the uniformity of the material is improved, the bottom flow mixed with the FBS tail coal enters an FBS tailing dewatering screen 5 to carry out medium removal, and the oversize material on the FBS tailing dewatering screen 5 enters a first centrifuge 6 to be treated and obtain a middling product; after entering a medium-waste classification cyclone 7 for classification, feeding a coarse coal slime dewatering screen 8 with a feed material, performing dewatering treatment on the coarse coal slime dewatering screen 8 to obtain a medium coal product, entering a medium-waste classification cyclone 7 with the undersize water of the coarse coal slime dewatering screen 8, and introducing the medium-waste classification cyclone 7 into a secondary thickener 3 for treatment in an overflow way; the second-stage concentrator 3 carries out second-stage concentration treatment on the first-stage concentration overflow, a medicament is added through a medicament adding device 13, the clarified second-stage concentrator 3 overflows into a circulating water pool 14 to be used as coal dressing circulating water, and the second-stage concentration underflow enters a concentration grading cyclone 4 to carry out third-stage concentration treatment; after the underflow of the concentration and classification cyclone 4 enters a middling medium removing sieve 9 for treatment, the medium removing material on the sieve is treated by a second centrifuge 10 to obtain a middling product; introducing undersize water of the middling medium removing sieve 9 and centrifugal liquid of a second centrifugal machine 10 into a middling gangue classification cyclone 7; the concentration grading cyclone 4 overflows into a filter press 11 to be filter-pressed and dehydrated into a coal slime filter cake, the coal slime filter cake is treated by a dryer 12 to obtain dry coal slime, and the filtrate of the filter press 11 is led into a two-stage thickener 3 to be treated; the system effectively relieves the environmental protection pressure caused by overlarge coal slime output, carries out multi-stage grading concentration on the flotation tail coal, reduces the coal slime amount step by step, reduces the feeding amount in the steps of filter pressing and drying, greatly reduces the drying cost and improves the economic benefit; meanwhile, the consumption of the medicament is reduced, and the production cost is greatly reduced.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.

Claims

1. The utility model provides a flotation tailing coal slime echelon decrement system which characterized in that: the flotation device comprises a first-stage high-efficiency thickener (1) for performing primary concentration treatment on flotation tailings, an FBS tailings feeding device (2) for adding FBS tailings into underflow treated by the first-stage high-efficiency thickener (1), a first dehydration recovery mechanism for performing recovery treatment on the underflow mixed with the FBS tailings, a second-stage thickener (3) for performing secondary concentration treatment on overflow of the first-stage high-efficiency thickener (1), a concentration and classification cyclone (4) for performing three-stage concentration and classification treatment on the underflow of the second-stage thickener (3), and a second dehydration recovery mechanism and a third dehydration recovery mechanism for respectively performing recovery treatment on two kinds of particle size products generated after classification treatment of the concentration and classification cyclone (4).

2. The flotation tailing coal slime echelon decrement system of claim 1, characterized in that: first dehydration recovery mechanism includes FBS tailing dewatering screen (5) that is connected with FBS tailing pan feeding device (2), takes off mesomaterial and screen drainage on the sieve of FBS tailing dewatering screen (5) and gets into first centrifuge (6) and second grade swirler (7) of waste rock through the pipeline respectively, the centrifugate of first centrifuge (6) gets into middle waste rock grading swirler (7) through the pipeline, the underflow opening and the overflow opening of middle waste rock grading swirler (7) are respectively through the pipeline connection coarse coal slime dewatering screen (8) and two-stage process concentrator (3), the screen drainage of coarse coal slime dewatering screen (8) gets into middle waste rock grading swirler (7) through the pipeline.

3. The flotation tailing coal slime echelon decrement system of claim 2, characterized in that: the second dehydration recovery mechanism comprises a middlings medium removal sieve (9) and a second centrifuge (10), an underflow pipe of the concentration classification cyclone (4) is connected with a feeding port of the middlings medium removal sieve (9), oversize medium removal materials and undersize water of the middlings medium removal sieve (9) respectively enter the second centrifuge (10) and the middlings classification cyclone (7) through pipelines, and centrifugal liquid of the second centrifuge (10) enters the middlings classification cyclone (7) through pipelines.

4. The flotation tailing coal slime echelon decrement system of claim 3, characterized in that: the third dehydration recovery mechanism comprises a filter press (11), the filter press (11) is connected with a dryer (12), and the filtrate of the filter press (11) enters the two-stage thickener (3) through a pipeline.

5. The flotation tailing coal slime echelon reduction system of any one of claims 1 to 4, wherein: an underflow pipe and an overflow pipe of the first-section high-efficiency thickener (1) are respectively connected with the FBS tail coal feeding device (2) and the second-section thickener (3), and a feeding port and the overflow pipe of the second-section thickener (3) are respectively connected with a dosing device (13) and a circulating water tank (14).