Secondary flotation device for filtrate water obtained after clean coal flotation in coal preparation plant

Abstract

The utility model discloses a secondary flotation device for filtrate water after clean coal flotation in a coal preparation plant. The device comprises a flotation machine, a pressure filter, a thickener, a filtrate bucket, a filtrate pump and an ore pulp preprocessor, the flotation machine is provided with two outlets, the first outlet is connected with the pressure filter through a pipeline, and the second outlet is connected with the thickener through a pipeline; a first filtrate outlet is formed below the pressurized filter steam-water separator; the filtrate bucket is connected with the first filtrate outlet through a pipeline; a second filtrate outlet is formed in the side surface of the bottom of the filtrate bucket; the inlet end of the filtrate pump is connected with the second filtrate outlet, and the outlet end of the filtrate pump is connected with the ore pulp preprocessor; and the outlet end of the ore pulp preprocessor is connected with the flotation machine through a pipeline. According to the utility model, clean coal slime stored in filtrate water of the pressure filter can be effectively recovered, the waste rate is reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal preparation equipment, in particular to a secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant. Background Art

[0002] A coal preparation plant is a coal processing plant that includes the following series of processes: raw coal screening, crushing, coal washing, separation, clean coal dehydration and coal slime recovery. It can separate coal from impurities, remove mineral impurities from raw coal, and divide it into products of different specifications.

[0003] Raw coal will be mixed with various mineral impurities during its formation process, and will inevitably be mixed with rocks and other impurities in the roof and floor during mining and transportation. Therefore, the raw coal must be prepared to remove impurities in the coal stone, reduce ash and sulfur, reduce air pollution caused by coal burning, and classify the coal into different qualities and specifications to meet the needs of users.

[0004] When the coal slime is recovered, the concentrate foam floated out by the flotation machine enters the pressure filter for dehydration and filtration. The filtered coal slime is transported to the outside of the coal preparation plant for recycling. The filtrate water of the pressure filter usually flows directly into the concentrator through an open circuit and is transferred to the concentrator tank for recycling as clarified water.

[0005] The principle of the pressure filter is to make the water in the coal slime pass through the monofilament filter cloth through the pressure difference, so as to achieve the effect of coal slime dehydration. The service life of the monofilament filter cloth is generally about three months. When it is close to three months, the pores of the filter cloth will expand and the water permeability will become stronger. The filter cloth may also be damaged, which will cause a small amount of coal slime in the filtrate water. These coal slimes are all clean coal obtained through flotation, with very low ash content. They are directly discharged to the concentrator with the filtrate water, which will cause some clean coal loss.

[0006] In the prior art, the filtrate water after dehydration by the pressure filter directly flows into the concentrator through an open circuit, and is transferred to the concentrating tank for recycling as clarified water. The clean coal slime still in the filtrate water is not effectively treated, and the clean coal slime in the filtrate water cannot be fully recycled, resulting in a partial waste of clean coal and affecting the subsequent recycling of the filtrate water.

[0007] In order to solve the above technical problems, the utility model proposes a secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant. Summary of the invention

[0008] The utility model aims to overcome the shortcomings of the prior art and proposes a secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant, which can effectively recover the clean coal slime in the filtrate water after primary flotation, reduce the waste rate and improve the economic benefit.

[0009] In order to achieve the above objectives, the utility model proposes the following technical solutions:

[0010] A secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant, comprising a flotation machine, a concentrator, a pressure filter, a filtrate bucket, a filtrate pump, and a slurry pre-processor;

[0011] The flotation machine is provided with two outlets, the first outlet is connected to the pressure filter through a pipeline, and is used for conveying the clean coal foam after the primary flotation, and the second outlet is connected to the concentrator through a pipeline, and is used for conveying the clean coal foam after the secondary flotation;

[0012] A first filtrate outlet is provided below the steam-water separator of the pressure filter;

[0013] The filtrate bucket is connected to the first filtrate outlet through a pipeline, and a second filtrate outlet is arranged on the bottom side of the filtrate bucket;

[0014] The inlet end of the filtrate water pump is connected to the second filtrate outlet, and the outlet end of the filtrate water pump is connected to the slurry preprocessor;

[0015] The outlet end of the slurry preprocessor is connected to the flotation machine through a pipeline.

[0016] Preferably, a liquid level sensor is provided in the filtrate bucket.

[0017] Preferably, the filtrate water pump is provided with a first controller, the first controller is connected to the liquid level sensor, and the first controller controls the opening and closing and flow rate of the filtrate water pump according to the liquid level signal transmitted by the liquid level sensor.

[0018] The liquid level sensor and the first controller mentioned above are technical devices in the prior art and can be directly used by those skilled in the art.

[0019] The above-mentioned coordinated use of the first controller, the liquid level sensor and the filtrate water pump is a technical means known to those skilled in the art.

[0020] Preferably, a metering pump is provided on the connecting pipeline between the slurry preprocessor and the flotation machine for calculating the delivery volume of the filtrate water to the flotation machine, so as to facilitate accurate calculation of the processing volume of the flotation machine.

[0021] Preferably, the concentrator is provided with a clean coal output pipeline, the clean coal output pipeline is connected to a clean coal storage tank, and a weighing meter is provided in the clean coal storage tank for calculating the amount of recovered clean coal.

[0022] Preferably, two branch pipelines are arranged at the first filtrate outlet of the pressure filter, the first branch pipeline is connected to the filtrate bucket, a recovery valve is arranged on the first branch pipeline, the second branch pipeline is openly connected to the concentrator, and a discharge valve is arranged on the second branch pipeline; a filtrate detector is arranged at the first filtrate outlet for detecting the clean coal content in the filtrate, a second controller is arranged at the filtrate detector, the second controller is respectively connected to the recovery valve and the discharge valve, the second controller opens and closes the recovery valve and the discharge valve in real time according to the detection result of the clean coal content in the filtrate by the filtrate detector, a clean coal content standard value is arranged inside the second controller, when the clean coal content in the filtrate exceeds the value, the recovery valve is opened, the filtrate enters the filtrate bucket for secondary flotation, when the clean coal content in the filtrate is lower than the value, the discharge valve is opened, the filtrate enters the concentrator in an open circuit and is discharged to the concentrator tank as clarified water for recycling; the above-mentioned standard value of clean coal content can be experimentally measured by technicians in this field, or obtained through mathematical calculation, which belongs to technical means known to technicians in this field.

[0023] The coordinated use of the recovery valve, the discharge valve, the second controller and the filtrate detector is a technical means known to those skilled in the art. The second controller and the filtrate monitor are technical equipment already available in the prior art and can be directly used by those skilled in the art.

[0024] The filtrate detector mentioned above, i.e., the filtrate detector used to detect the clean coal content in the filtrate, is a technical device known to those skilled in the art. The filtrate detection method can be to collect a filtrate sample, filter or dry the filtrate sample, and calculate the clean coal content by a weight method or a flotation method, which is a feasible technical solution.

[0025] Specifically, first, the clean coal foam selected by the flotation machine enters the pressurized filter, and the flotation clean coal after pressurized filtration is mixed with the jigging clean coal as the final product. At this time, the filtrate water after pressurized filtration enters the filtrate water bucket through the first filtrate outlet for accumulation. After accumulating to a certain amount, the filtrate water in the filtrate water bucket enters the slurry preprocessor through the filtrate water pump for pretreatment before flotation to improve the flotation effect. The filtrate water after pretreatment is returned to the flotation machine for secondary flotation. After the flotation clean coal, it enters the concentrator for further dehydration and concentration to increase the clean coal concentration. The concentrated clean coal can be used as the final product for subsequent treatment. From then on, the secondary flotation is completed, forming a closed-loop cycle recycling of the filtrate water, reducing waste and improving economic benefits.

[0026] The beneficial effects of the utility model are:

[0027] The utility model arranges a filtrate bucket, a filtrate pump and a slurry preprocessor after the pressure filter, and the slurry preprocessor is connected to the flotation machine to form a closed-loop circulation of secondary flotation of the filtrate water, thereby achieving full recovery and treatment of the filtrate water, fully extracting the clean coal contained therein, and avoiding waste.

[0028] The utility model returns the filtrate water to the flotation machine for secondary flotation, thereby improving the utilization rate of the flotation machine and making full use of the processing capacity of the flotation machine.

[0029] By adopting the above scheme, the utility model can effectively recover the clean coal slime in the filtrate water of the pressure filter, reduce the waste rate and improve the economic benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is a device flow chart of the first embodiment.

[0032] Figure 2 It is a device flow chart of the second embodiment.

[0033] In the figure, 1-flotation machine, 2-thickener, 3-pressure filter, 4-filtrate bucket, 5-filtrate pump, 6-slurry pre-processor, 7-discharge valve, 8-recovery valve, 9-filtrate detector. Implementation

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] First embodiment:

[0039] like Figure 1 As shown, a secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant comprises a flotation machine 1, a concentrator 2, a pressure filter 3, a filtrate bucket 4, a filtrate pump 5, and a slurry preprocessor 6;

[0040] The flotation machine 1 is provided with two outlets, the first outlet is connected to the pressure filter 3 through a pipeline, and the second outlet is connected to the concentrator 2 through a pipeline;

[0041] A first filtrate outlet is provided below the steam-water separator of the pressure filter 3;

[0042] The filtrate bucket 4 is connected to the first filtrate outlet through a pipeline, and a second filtrate outlet is arranged on the bottom side of the filtrate bucket 4;

[0043] The inlet end of the filtrate pump 5 is connected to the second filtrate outlet, and the outlet end of the filtrate pump 5 is connected to the slurry preprocessor 6;

[0044] The outlet end of the slurry pre-processor 6 is connected to the flotation machine 1 through a pipeline.

[0045] Second embodiment:

[0046] like Figure 2 As shown, a secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant comprises a flotation machine 1, a concentrator 2, a pressure filter 3, a filtrate bucket 4, a filtrate pump 5, and a slurry preprocessor 6;

[0047] The flotation machine 1 is provided with two outlets, the first outlet is connected to the pressure filter 3 through a pipeline, and the second outlet is connected to the concentrator 2 through a pipeline;

[0048] A first filtrate outlet is provided below the steam-water separator of the pressure filter 3;

[0049] The filtrate bucket 4 is connected to the first filtrate outlet through a pipeline, and a second filtrate outlet is arranged on the bottom side of the filtrate bucket 4;

[0050] The inlet end of the filtrate pump 5 is connected to the second filtrate outlet, and the outlet end of the filtrate pump 5 is connected to the slurry preprocessor 6;

[0051] The outlet end of the slurry pre-processor 6 is connected to the flotation machine 1 through a pipeline.

[0052] The first filtrate outlet of the pressure filter 3 is provided with two branch pipelines, the first branch pipeline is connected to the filtrate bucket 4, a recovery valve 8 is provided on the first branch pipeline, the second branch pipeline is openly connected to the concentrator 2, and a discharge valve 7 is provided on the second branch pipeline; a filtrate detector 9 is provided at the first filtrate outlet for detecting the clean coal content in the filtrate, a second controller is provided at the filtrate detector 9, the second controller is respectively connected to the recovery valve 8 and the discharge valve 7, the second controller opens and closes the recovery valve 8 and the discharge valve 7 in real time according to the detection result of the clean coal content in the filtrate by the filtrate detector 9, a clean coal content standard value is set inside the second controller, when the clean coal content in the filtrate exceeds the value, the recovery valve 8 is opened, the filtrate enters the filtrate bucket 4 for secondary flotation, when the clean coal content in the filtrate is lower than the value, the discharge valve 7 is opened, the filtrate enters the concentrator 2 for open circuit transfer to the concentrator tank for recycling as clarified water; the above-mentioned clean coal content standard value can be experimentally measured by those skilled in the art, or obtained by mathematical calculation, which belongs to the technical means known to those skilled in the art.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant, comprising a flotation machine, a pressure filter and a concentrator, characterized in that: It also includes a filtrate bucket, a filtrate pump, and a pulp preprocessor. The flotation machine is provided with two outlets, the first outlet is connected to the pressure filter through a pipeline, and the second outlet is connected to the concentrator through a pipeline; a first filtrate outlet is provided below the steam-water separator of the pressure filter; the filtrate bucket is connected to the first filtrate outlet through a pipeline, and a second filtrate outlet is provided on the bottom side of the filtrate bucket; the inlet end of the filtrate pump is connected to the second filtrate outlet, and the outlet end of the filtrate pump is connected to the pulp preprocessor; the outlet end of the pulp preprocessor is connected to the flotation machine through a pipeline.

2. A secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant according to claim 1, characterized in that: A liquid level sensor is arranged in the filtrate bucket.

3. The secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant according to claim 1, characterized in that: Two branch pipelines are arranged at the first filtrate outlet of the pressurized filter, and the two branch pipelines are respectively a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the filtrate bucket, and a recovery valve is arranged on the first branch pipeline. The second branch pipeline is open-circuitedly connected to the concentrator, and a discharge valve is arranged on the second branch pipeline. A filtrate detector is arranged at the first filtrate outlet for detecting the clean coal content in the filtrate. A second controller is arranged at the filtrate detector, and the second controller is respectively connected to the recovery valve and the discharge valve.

4. The secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant according to claim 1, characterized in that: A metering pump is provided on the connecting pipeline between the slurry preprocessor and the flotation machine.

5. The secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant according to claim 1, characterized in that: The concentrator is provided with a clean coal output pipeline, the clean coal output pipeline is connected to a clean coal storage tank, and a weighing meter is provided in the clean coal storage tank.

6. A secondary flotation device for filtrate water after flotation of clean coal in a coal preparation plant according to claim 2, characterized in that: The filtrate water pump is provided with a first controller, and the first controller is connected to the liquid level sensor.

Images