CN111420796A - Solid-liquid separation method for coal dressing and mineral separation - Google Patents
Solid-liquid separation method for coal dressing and mineral separation Download PDFInfo
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- CN111420796A CN111420796A CN202010163590.5A CN202010163590A CN111420796A CN 111420796 A CN111420796 A CN 111420796A CN 202010163590 A CN202010163590 A CN 202010163590A CN 111420796 A CN111420796 A CN 111420796A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
Abstract
The invention provides a solid-liquid separation method for coal dressing and mineral separation, which comprises the steps of fractional concentration, coagulation and flocculation by adding magnetic media, magnetic or gravity separation, magnetic floccule shearing, and magnetic media recovery and reuse. The separation method is used for treating coal dressing slime water and mineral dressing tailing water of a non-dense medium separation process or a dense medium separation process, the treatment is rapid and efficient, the magnetic medium can be recycled, and clean water coal washing and low-concentration circulating water mineral dressing of a coal dressing plant can be realized. The magnetic medium adopted by the invention is universal magnetite powder, has rich sources and high recovery efficiency, has rich use experience in the field of coal, and can ensure the stable operation of a process system.
Description
Technical Field
The invention relates to the field of water treatment of coal preparation plants and mineral separation plants, in particular to a high-efficiency solid-liquid separation process for coal preparation and mineral separation.
Background
The production and the life of human beings can not leave precious water resources, but certain pollution is inevitably caused to the water resources in the process of life and production, and how to separate pollutants from water bodies efficiently is an important subject related to human survival and development.
Coal is used as industrial grain, the market demand is huge, but serious influence is caused to underground water systems and ground water bodies in the coal mining and washing processes, and particularly, areas with abundant coal resources in China are located in the west of drought and water shortage on the whole, so that efficient treatment of wastewater generated in the coal production process has great significance for protecting the ecological environment of the areas. Meanwhile, most of mineral resources in China have low content of useful components, the useful minerals must be enriched through washing, a large amount of tailings are generated in the washing process, the efficient solid-liquid separation of the mineral dressing tailing water is realized, and the method has great significance for environmental protection and production cost reduction.
Because the coal dressing slime water and the mineral processing tailing water have certain particularity and are different from conventional sewage treatment, the existing treatment technology aiming at the coal dressing slime water and the mineral processing tailing water is more traditional and has lower efficiency, a simple, high-efficiency, high-applicability, economic and reasonable process is developed, and the method is a research direction for treating and utilizing the coal dressing slime water and the mineral processing tailing water.
Disclosure of Invention
The invention aims to provide an efficient solid-liquid separation process for coal dressing and mineral separation, which has the advantages of high reliability, strong applicability, simple operation and easy realization of automation. The method can realize the clean water coal washing and the low-concentration circulating water ore dressing of a coal dressing plant, and has remarkable economic and social benefits.
The invention is realized by the following technical scheme.
A solid-liquid separation method for coal dressing and mineral separation comprises the following steps:
step S1, a stirring step, in which the solid-liquid mixture to be treated is fully mixed with a coagulant, a magnetic medium and a flocculant to form magnetic flocs;
step S2, a magnetic force or gravity separation step, wherein the magnetic flocs are fed into a first magnetic separator or an inclined tube sedimentation tank to complete the separation of the magnetic flocs and water;
step S3, a magnetic floc shearing step, in which the magnetic floc separated from water is sheared to completely dissociate the magnetic medium from the coal slime or gangue particles;
and step S4, a magnetic medium recycling step, wherein the magnetic flocs are fed into a second magnetic separator after being cut, and the magnetic medium in the magnetic flocs is recycled by the second magnetic separator for recycling.
Preferably, when the particle size composition and the concentration of the solid-liquid mixture can not meet the requirements, the method further comprises the following steps:
step S0, fractional concentration step, feeding the solid-liquid mixture to be treated into a cyclone, and the overflow of the cyclone enters the step S1.
Preferably, the cyclone in the step S0 is a classifying cyclone or a screen cyclone.
Preferably, the solid-liquid mixture is coal preparation slime water and/or mineral dressing tailing water of a non-dense medium separation process.
Preferably, in step S4, the recovered magnetic medium is fed to step S1 for multiplexing, and the underflow of the cyclone is mixed with the coal slurry or gangue after the recovery of the magnetic medium, and then the mixture is subjected to a subsequent dewatering operation.
Preferably, the solid-liquid mixture is coal dressing slime water and/or mineral dressing tailing water of a dense medium process.
Preferably, in step S4, a part of the recovered magnetic media is returned to the qualified media bucket of the dense media sorting system, and another part is fed to step S1 for multiplexing; and the coal slime or gangue separated from the magnetic medium enters the subsequent dehydration operation. Or
And when the granularity composition and the concentration of the solid-liquid mixture cannot meet the requirements, the underflow of the cyclone and the sheared magnetic flocs enter a second magnetic separator together, and the coal slime or gangue after the magnetic medium is recovered enters the subsequent dehydration operation.
Preferably, the first magnetic separator in step S2 is a drum-type magnetic separator or a magnetic disc-type magnetic separator, and the magnetic field strength of the drum-type magnetic separator or the magnetic disc-type magnetic separator is 2500-7000 Gs.
Preferably, the second magnetic separator in the step S4 is a drum magnetic separator.
Preferably, the magnetic medium is magnetite powder, and the particle size of the magnetite powder is less than 100 meshes.
Through the technical scheme, the invention can obtain the following beneficial effects.
1. The separation process of the invention applies the magnetic medium when processing coal dressing slime water and mineral dressing tailing water, has fast processing speed and small occupied area, and the magnetic medium can be recycled, thus realizing clean water coal washing and low-concentration circulating water mineral dressing of a coal dressing plant.
2. The separation process has flexible arrangement mode, and can finish the material transmission work among all working procedures through self-flowing and pumping.
3. The separation process of the invention can adjust the working state or the operating parameter of the grading cyclone or the screen cyclone according to the granularity composition and the concentration of the coal dressing slime water and the mineral dressing tailing water, and the system has strong adaptability.
4. The magnetic medium adopted by the invention is universal magnetite powder, has rich sources and high recovery efficiency, has rich use experience in the field of coal, and can ensure the stable operation of a process system.
5. When the separation process is applied to coal dressing slime water treatment, a magnetic separator of a dense medium separation process can be omitted, and the construction investment and the operation cost of a coal dressing plant are further reduced.
Drawings
FIG. 1 is a process flow diagram of the separation process of the present invention for treating coal dressing slime water and mineral dressing tailing water of a non-dense medium separation process.
FIG. 2 is a process flow diagram of the separation process of the invention for treating coal dressing slime water and mineral dressing tailing water of the heavy-medium separation process.
Detailed Description
Example 1
This embodiment provides a process flow for treating coal-dressing slime water and tailings water of a non-dense medium separation process according to the separation process of the present invention.
As shown in fig. 1, the separation process flow of this embodiment is: a high-efficiency solid-liquid separation process for coal dressing and ore dressing is characterized by that according to the grain size composition and concentration of coal-dressing slime water and ore dressing tail water to be treated it can select whether it needs to be passed through grading cyclone or screen cyclone to make grading concentration treatment or not, and according to the grain size composition and concentration the operation parameters can be regulated.
If the granularity composition and concentration meet the requirements of subsequent processes, directly feeding coal dressing slime water or ore dressing tailing water to be treated into a stirring process, fully mixing the coal dressing slime water or ore dressing tailing water with a coagulant, a magnetic medium and a flocculating agent in the stirring process to form magnetic flocs with coal slime or gangue particles and the magnetic medium tightly combined, then feeding the slime water or tailing water containing the magnetic flocs into a drum-type magnetic separator or a magnetic disc-type magnetic separator (or an inclined tube sedimentation tank), completing the separation of the magnetic flocs and water, and taking the separated water as water for coal dressing and ore dressing production.
If the granularity composition and concentration can not meet the requirements of the subsequent process, feeding the coal dressing slime water or the mineral dressing tailing water to be treated into a classification cyclone or a screen cyclone, overflowing the cyclone into a stirring process, fully mixing the coal dressing slime water or the mineral dressing tailing water with a coagulant, a magnetic medium and a flocculating agent in the stirring process to form magnetic flocs of which coal slime or gangue particles are tightly combined with the magnetic medium, feeding the slime water or the tailing water containing the magnetic flocs into a drum-type magnetic separator or a magnetic disc-type magnetic separator or an inclined tube sedimentation tank to separate the magnetic flocs from the water, and taking the separated water as the water for the coal dressing production.
In a preferred embodiment, the agitation step includes agitation with the coagulant and the magnetic medium in the primary agitation tank and agitation with the flocculant in the secondary agitation tank.
In a preferred embodiment, the magnetic medium is magnetite powder. In a more preferred embodiment, the magnetic iron powder has a particle size of 100 mesh or less.
In a preferred embodiment, the magnetic field intensity of the drum-type magnetic separator or the magnetic disc-type magnetic separator is 2500-7000 Gs.
After the magnetic flocs are separated from water, the stability of the magnetic flocs is destroyed through high-speed shearing, so that the magnetic medium and coal slime or gangue particles are completely dissociated. The shearing of the magnetic flocs is to cut and disperse the high molecular medicament so as to fully dissociate the magnetic medium from the coal slime or gangue and other particles.
After the magnetic flocs are cut, the magnetic medium in the magnetic flocs is recycled by a roller magnetic separator, the recycled magnetic medium is fed into a stirring process for reuse, and the underflow of a cyclone (if any) and the coal slime or gangue after the magnetic medium is recycled are mixed and fed into the subsequent dehydration operation.
In a preferred embodiment, the magnetic medium recovery equipment is a drum magnetic separator.
Example 2
This example provides a process flow for treating coal dressing slime water and mineral dressing tailing water of a dense medium separation process according to the separation process of the present invention.
As shown in fig. 2, the separation process flow of this embodiment is: a high-efficiency solid-liquid separation process for coal dressing and ore dressing selects whether to be subjected to grading concentration treatment by a grading cyclone or a screen cyclone according to the granularity composition and concentration of coal dressing slime water or ore dressing tailing water to be treated, and adjusts operation parameters according to the granularity composition and concentration.
If the granularity composition and concentration meet the requirements of subsequent processes, directly feeding coal dressing slime water or ore dressing tailing water to be treated into a stirring process, fully mixing the coal dressing slime water or ore dressing tailing water with a coagulant, a magnetic medium and a flocculating agent in the stirring process to form magnetic flocs with coal slime or gangue particles and the magnetic medium tightly combined, then feeding the slime water or tailing water containing the magnetic flocs into a drum-type magnetic separator or a magnetic disc-type magnetic separator (or an inclined tube sedimentation tank), completing the separation of the magnetic flocs and water, and taking the separated water as water for coal dressing and ore dressing production.
If the granularity composition and concentration can not meet the requirements of the subsequent process, feeding the coal dressing slime water or the mineral dressing tailing water to be treated into a classification cyclone or a screen cyclone, overflowing the cyclone into a stirring process, fully mixing the coal dressing slime water or the mineral dressing tailing water with a coagulant, a magnetic medium and a flocculating agent in the stirring process to form magnetic flocs of which coal slime or gangue particles are tightly combined with the magnetic medium, feeding the slime water or the tailing water containing the magnetic flocs into a drum-type magnetic separator or a magnetic disc-type magnetic separator or an inclined tube sedimentation tank to separate the magnetic flocs from the water, and taking the separated water as the water for the coal dressing production.
In a preferred embodiment, the agitation step includes agitation with the coagulant and the magnetic medium in the primary agitation tank and agitation with the flocculant in the secondary agitation tank.
In a preferred embodiment, the magnetic medium is magnetite powder. In a more preferred embodiment, the magnetic iron powder has a particle size of 100 mesh or less.
In a preferred embodiment, the magnetic field intensity of the drum-type magnetic separator or the magnetic disc-type magnetic separator is 2500-7000 Gs.
After the magnetic flocs are separated from water, the stability of the magnetic flocs is destroyed through high-speed shearing, so that the magnetic medium and coal slime or gangue particles are completely dissociated. The shearing of the magnetic flocs is to cut and disperse the high molecular medicament so as to fully dissociate the magnetic medium from the coal slime or gangue and other particles.
After the magnetic flocs are sheared, the magnetic flocs and the underflow (if any) of the cyclone are mixed and recycled by the roller magnetic separator, a part of recycled magnetic media needs to be returned to a qualified medium barrel of the dense medium sorting system, the other part of the recycled magnetic media is fed into a stirring process for reuse, and the coal slime or gangue separated from the magnetic media is fed into the subsequent dehydration operation.
In a preferred embodiment, the magnetic medium recovery equipment is a drum magnetic separator.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A solid-liquid separation method for coal dressing and mineral separation comprises the following steps:
step S1, a stirring step, in which the solid-liquid mixture to be treated is fully mixed with a coagulant, a magnetic medium and a flocculant to form magnetic flocs;
step S2, a magnetic force or gravity separation step, wherein the magnetic flocs are fed into a first magnetic separator or an inclined tube sedimentation tank to complete the separation of the magnetic flocs and water;
step S3, a magnetic floc shearing step, in which the magnetic floc separated from water is sheared to completely dissociate the magnetic medium from the coal slime or gangue particles;
and step S4, a magnetic medium recycling step, wherein the magnetic flocs are fed into a second magnetic separator after being cut, and the magnetic medium in the magnetic flocs is recycled by the second magnetic separator for recycling.
2. The solid-liquid separation method for coal dressing and ore dressing according to claim 1, wherein when the particle size composition and concentration of the solid-liquid mixture cannot meet the requirements, the method further comprises the following steps:
step S0, fractional concentration step, feeding the solid-liquid mixture to be treated into a cyclone, and the overflow of the cyclone enters the step S1.
3. The solid-liquid separation method for coal dressing and ore dressing according to claim 2, wherein the cyclone in step S0 is a classifying cyclone or a screen cyclone.
4. The solid-liquid separation method for coal dressing and mineral separation according to claim 2 or 3, characterized in that the solid-liquid mixture is coal dressing slime water and/or mineral dressing tailing water of a non-dense medium separation process.
5. The solid-liquid separation method for coal dressing and ore dressing according to claim 4, wherein in step S4, the recovered magnetic medium is fed into step S1 for reuse;
the coal slime or gangue after the magnetic medium is recovered enters the subsequent dehydration operation; or
And when the granularity composition and the concentration of the solid-liquid mixture cannot meet the requirements, mixing the underflow of the cyclone and the coal slime or gangue after the magnetic medium is recovered, and then performing subsequent dehydration operation.
6. The solid-liquid separation method for coal dressing and mineral separation according to claim 2 or 3, characterized in that the solid-liquid mixture is heavy-medium process coal dressing slime water and/or mineral dressing tailing water.
7. The solid-liquid separation method for coal dressing and ore dressing according to claim 6, wherein in step S4, a part of the recovered magnetic media is returned to the qualified media bucket of the dense media separation system, and another part is fed to step S1 for reuse; the coal slime or gangue separated from the magnetic medium enters the subsequent dehydration operation; or
And when the granularity composition and the concentration of the solid-liquid mixture cannot meet the requirements, the underflow of the cyclone and the sheared magnetic flocs enter a second magnetic separator together, and the coal slime or gangue after the magnetic medium is recovered enters the subsequent dehydration operation.
8. The solid-liquid separation method for coal dressing and ore dressing according to claim 1, wherein the first magnetic separator in step S2 is a drum-type magnetic separator or a magnetic disc-type magnetic separator, and the magnetic field strength of the drum-type magnetic separator or the magnetic disc-type magnetic separator is 2500-7000 Gs.
9. The solid-liquid separation method for coal dressing and ore dressing according to claim 1, wherein the second magnetic separator in step S4 is a roller magnetic separator.
10. The solid-liquid separation method for coal dressing and ore dressing according to claim 1, wherein the magnetic medium is magnetite powder, and the particle size of the magnetite powder is less than 100 meshes.
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| CN102515325A (en) * | 2011-12-16 | 2012-06-27 | 四川环能德美科技股份有限公司 | Treatment process for mine water of coal deep well |
| CN204848391U (en) * | 2015-07-03 | 2015-12-09 | 安徽理工大学 | Device of clarification falls in supplementary coal slime depositing in water of magnetism kind flocculation applied magnetic field |
| CN205528232U (en) * | 2016-01-12 | 2016-08-31 | 陕西胜利高原环保科技有限公司 | Oil field work effluent disposal system |
| CN107473339A (en) * | 2017-07-21 | 2017-12-15 | 山东科技大学 | A kind of mine water magnetic-coagulation processing unit and technique |
| CN109550585A (en) * | 2018-10-29 | 2019-04-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of it improving complicated difficult and selects the ferric oxide ore rate of recovery |
| CN209602174U (en) * | 2018-12-17 | 2019-11-08 | 广东国能中林实业有限公司 | A kind of super magnetic separating apparatus |
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2020
- 2020-03-10 CN CN202010163590.5A patent/CN111420796A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102515325A (en) * | 2011-12-16 | 2012-06-27 | 四川环能德美科技股份有限公司 | Treatment process for mine water of coal deep well |
| CN204848391U (en) * | 2015-07-03 | 2015-12-09 | 安徽理工大学 | Device of clarification falls in supplementary coal slime depositing in water of magnetism kind flocculation applied magnetic field |
| CN205528232U (en) * | 2016-01-12 | 2016-08-31 | 陕西胜利高原环保科技有限公司 | Oil field work effluent disposal system |
| CN107473339A (en) * | 2017-07-21 | 2017-12-15 | 山东科技大学 | A kind of mine water magnetic-coagulation processing unit and technique |
| CN109550585A (en) * | 2018-10-29 | 2019-04-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of it improving complicated difficult and selects the ferric oxide ore rate of recovery |
| CN209602174U (en) * | 2018-12-17 | 2019-11-08 | 广东国能中林实业有限公司 | A kind of super magnetic separating apparatus |
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Application publication date: 20200717 |