CN113210133A - Three-time coal flotation process - Google Patents
Three-time coal flotation process Download PDFInfo
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- CN113210133A CN113210133A CN202110443587.3A CN202110443587A CN113210133A CN 113210133 A CN113210133 A CN 113210133A CN 202110443587 A CN202110443587 A CN 202110443587A CN 113210133 A CN113210133 A CN 113210133A
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- coal
- flotation
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
Abstract
The invention provides a tertiary coal flotation process, which finally produces four products of low-ash clean coal, high-ash clean coal, medium coal mud and mud gangue through the tertiary coal flotation process, can ensure that the mud gangue ash content reaches or is greater than the gangue ash content of a coal preparation plant, and the mud gangue product can be directly discharged without causing resource waste, thereby eliminating the production dilemma that the tail coal mud is difficult to be sold independently and occupies a large amount of accumulated fields in the conventional flotation process; moreover, the invention can control the ash content of the medium coal slime on the premise of ensuring that the ash content of the low-ash clean coal and the high-ash clean coal reaches the production ash content index in production, realizes that the ash content of the mud gangue reaches or is greater than the ash content of the gangue in a coal preparation plant, and can recover the useful resources in the coal slime to the maximum extent.
Description
Technical Field
The invention relates to the technical field of a coal flotation process, in particular to a three-time coal flotation process.
Background
A common coal flotation process for coal preparation plants comprises the steps of carrying out coarse cutting treatment on coal slurry in the coal preparation process, adding a flotation reagent and dilution water into the coal slurry with the coal slurry particle size fraction of 0.5 (0.25) mm-0mm, carrying out size mixing and mineralization, and then feeding the mixture into a flotation machine for flotation to produce two products, namely clean coal and tail coal, or three products, namely clean coal, medium coal and tail coal.
For example, patent No. 2010206966982 discloses a coal slime sinking and floating machine, which is used for separating two products of clean coal and tail coal through a flotation process, wherein the ash content of the tail coal is lower under the condition of ensuring that the ash content index of the clean coal is qualified; under the condition of ensuring that the ash content of the tail coal is higher, the ash content index of the flotation clean coal is increased at the same time; the invention patent with the publication number of CN 108855586B discloses a combined unit for flotation coal separation, which is characterized in that when three products of clean coal, middlings and tailings are separated by a flotation process, under the condition of ensuring that the ash content indexes of the middlings and the ash content indexes of the tailings are qualified, the ash content of the clean coal products can hardly meet the indexes of the products; under the condition of ensuring that the indexes of clean coal product ash and middling coal product ash are qualified, the tail coal ash is difficult to reach or exceed the ash content of gangue in a coal preparation plant and cannot be directly discarded, and because the tail coal has high moisture and low calorific value, the product is low in price and few in users when sold independently, so that the production dilemma of dilemma is faced.
Disclosure of Invention
The invention aims to provide a tertiary floating coal separation process, which can control the ash content of medium coal slime on the premise of ensuring that the ash content of low-ash clean coal and high-ash clean coal reaches the production ash content index in production, realize that the ash content of mud gangue reaches or is greater than the ash content of gangue in a coal preparation plant, and can recover useful resources in the coal slime to the greatest extent.
In order to achieve the purpose, the invention adopts the technical scheme that: a three-time coal flotation process comprises the following steps:
1) pretreating, namely feeding slime water of a production system into a primary flotation pulp preprocessor after coarse cutting treatment, taking the slime water as a flotation feed after size mixing and mineralization, and then feeding the slime water into a primary flotation machine for primary flotation;
2) performing primary flotation, wherein concentrate in one chamber to three chambers of the primary flotation machine is treated according to the ash content, if the ash content is less than or equal to 8.5%, the concentrate is defoamed and directly used as low-ash concentrate for pressure filtration, and if the ash content is more than 8.5%, the concentrate automatically flows into a secondary flotation machine after being defoamed and size-mixed; directly feeding high-ash concentrates in four chambers and five chambers of the primary flotation machine into a secondary flotation machine; the tailings of the primary flotation machine enter a first thickener, the underflow of the first thickener is fed into a first filter press, and the product after filter pressing is used as mud gangue;
3) performing secondary flotation, wherein concentrate from a first chamber to a second chamber of the secondary flotation machine is used as low-ash clean coal; the third chamber concentrate is processed according to the ash content, if the ash content is less than or equal to 8.5 percent, the concentrate is defoamed and then directly used as low ash concentrate to be fed into a pressure filtration link, the product of the pressure filtration is low ash clean coal, and if the ash content is more than 8.5 percent, the concentrate is defoamed and then fed into a tertiary flotation machine; directly feeding the concentrate in the fourth chamber into a third flotation machine; feeding tailings of the secondary flotation machine into a second thickener, feeding underflow of the second thickener into a third filter press, and taking a filter-pressed product as medium coal slime;
4) and performing tertiary flotation, wherein the tertiary flotation machine adopts a three-chamber flotation machine, the tertiary flotation concentrate is used as high-ash concentrate and fed into a second filter press, and the dehydration product is used as high-ash clean coal.
Further, the size fraction of the cut-off coarse particles in the step 1) is 0.5-0mm or 0.25-0 mm.
Further, the second thickener is a middlings thickener.
Furthermore, the second filter press adopts a single-chamber feeding air cross-flow filter press.
Furthermore, the tailings of the tertiary flotation machine can be returned to the secondary flotation machine, and can also be directly fed into the second thickener.
Furthermore, the overflow of the first thickener is used as circulating water of the flotation coal preparation process.
Furthermore, the overflow of the second thickener and the filtrate of the third filter press are used as the circulating water of the coal flotation process.
Further, the filtrate of the second filter press is used as dilution water of the secondary flotation machine.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through the three-time coal flotation process, four products of low-ash clean coal, high-ash clean coal, medium coal slime and mud gangue are finally produced, and the mud gangue ash content can be ensured to reach or be greater than the gangue ash content of a coal preparation plant, and such mud gangue products can be directly discharged without causing resource waste, so that the production dilemma that the tail coal slime is difficult to sell independently and occupies a large amount of accumulated fields in the conventional flotation process is eliminated; moreover, the invention can control the ash content of the medium coal slime on the premise of ensuring that the ash content of the low-ash clean coal and the high-ash clean coal reaches the production ash content index in production, realizes that the ash content of the mud gangue reaches or is greater than the ash content of the gangue in a coal preparation plant, and can recover the useful resources in the coal slime to the maximum extent.
Drawings
FIG. 1 is a schematic flow diagram of a triple flotation process of the present invention;
the labels in the figure are: 1. flotation feeding, 2, a primary flotation machine, 3, a secondary flotation machine, 4, pressure filtration, 5, a tertiary flotation machine, 6, a second filter press, 7, a first thickener, 8, a first filter press, 9, a second thickener, 10, a third filter press, 11, low-ash clean coal, 12, high-ash clean coal, 13, mud gangue, 14, medium coal slime, 15 and circulating water.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Patent No. 2010206966982, the name is coal slime ups and downs machine, and when its flotation technology was in the two kinds of products of sorting clean coal, tailing, after the middlings got into the flotation clean coal, the flotation clean coal ash content was on the high side, and after the middlings got into the coal slime tailing, the coal slime tailing ash content was on the low side.
The patent with the publication number of CN 108855586B, entitled as a combined unit for flotation coal separation, when three products of clean coal, middlings and tail coal are separated by the flotation process, if the ash content of the clean coal and the ash content of the middlings are preferentially ensured to meet the index requirements of the products, under the premise, according to the ash content balance principle, the ash content of the tail coal is uncontrollable, the ash content of the tail coal cannot reach or exceed the ash content of gangue in a coal separation plant and cannot be directly discarded, and at the moment, the tail coal also needs to be dehydrated and then independently recovered, but because the tail coal has higher moisture content, the calorific value is low, and the economic benefit of independently recovering the products is low; when the flotation process is used for sorting three products, namely clean coal, middlings and tail coal, if the ash content of the tail coal is preferentially ensured to reach or exceed the ash content of gangue in a coal preparation plant and is directly discarded, and meanwhile, the ash content of the middlings meets the index requirement of the product, on the premise, the ash content of the clean coal is uncontrollable according to the ash content balance principle, and the clean coal is the most critical product of the flotation process.
In conclusion, the existing flotation process generally only produces two products of clean coal and tail coal or three products of clean coal, middlings and tail coal, and has more problems, so that the invention adopts a tertiary flotation process to finally produce four products of low-ash clean coal, high-ash clean coal, middlings mud and mud gangue, and can ensure that the mud gangue ash content reaches or is greater than the gangue ash content of a coal dressing plant, and the mud gangue products can be directly discharged without causing resource waste, thereby eliminating the production difficulty that the tail coal slime is difficult to be sold separately and occupies a large amount of site accumulation in the conventional flotation process.
The invention provides a three-time coal flotation process, as shown in figure 1, which comprises the following steps:
1) pretreating, namely feeding slime water of a production system into a primary flotation pulp preprocessor after coarse cutting treatment, taking the slime water as a flotation feed material 1 after size mixing and mineralization, and then feeding the slime water into a primary flotation machine 2 for primary flotation, wherein the coarse cutting grade during coarse cutting treatment is 0.5-0mm or 0.25-0 mm;
2) performing primary flotation, wherein the concentrate in one chamber to three chambers is treated according to the ash content, if the ash content is less than or equal to 8.5%, the concentrate is directly used as low-ash concentrate after defoaming for pressure filtration 4, and if the ash content is more than 8.5%, the concentrate automatically flows into a secondary flotation machine 3 after defoaming and size mixing; directly feeding high-ash concentrates in four chambers and five chambers of the primary flotation machine into a secondary flotation machine; the key of the primary flotation is that the ash content of primary flotation tailings is ensured to be equal to or more than the gangue ash content required by a coal preparation plant through the sufficient flotation time of 5 separation chambers of the flotation machine, the tailings of the primary flotation machine enter a first thickener 7, the bottom flow of the first thickener 7 is fed into a first filter press 8, the product after filter pressing is used as mud gangue 13, and in addition, the overflow of the first thickener 7 is used as circulating water 15 of the coal flotation process.
The invention adopts the flotation machine with 5 separation chambers for primary flotation, can ensure that the ash content of the primary flotation tailings is equal to or more than the ash content of the gangue required by a coal preparation plant through the full flotation of the 5 separation chambers of the flotation machine, can be mixed into the gangue in the coal preparation plant for discharge after filter pressing, dehydration and recovery, and eliminates the tail coal slime product of the coal preparation plant. In the existing flotation process, a flotation machine with 3 or 4 separation chambers is generally adopted for primary flotation, the flotation time of coal slime is relatively short, the ash content of primary flotation tailings cannot be equal to or more than the ash content of gangue required by a coal preparation plant, the coal slime is generally sold as tail coal slime after dehydration and recovery, but the normal production of the coal preparation plant is influenced due to high water content, high ash content, low calorific value, low solid selling price and difficult sale, and the large amount of tail coal slime accumulated in the plant and the lost sales of the tail coal slime.
3) Performing secondary flotation, wherein concentrate in one chamber to two chambers of the secondary flotation machine 3 is used as low-ash clean coal; the concentrate in the third chamber is treated according to the ash content, if the ash content is less than or equal to 8.5 percent, the concentrate is defoamed and directly used as low-ash concentrate to be fed into a step 4 of pressure filtration, the product of the pressure filtration 4 is low-ash clean coal 11, and if the ash content is more than 8.5 percent, the concentrate is defoamed and then fed into a tertiary flotation machine 5; the fourth chamber concentrate is directly fed into a third flotation machine 5; tailings of the secondary flotation machine are fed into a second thickener 9, the underflow of the second thickener 9 is fed into a third filter press 10, and the filter-pressed product is used as medium coal slime 14; the overflow of the second thickener 9 and the filtrate of the third filter press 10 are used as the circulating water of the coal flotation process. The second thickener 9 in the invention is a middling sludge thickener, the middling sludge product is dehydrated by a high-pressure diaphragm filter press, the squeezing pressure is about 3.0Mpa, and the moisture of the filter cake can be ensured to be not more than 19%, so that the middling sludge has higher heating value, the final heating value of the middling product cannot be influenced after the middling sludge is mixed in, and the middling sludge is not required to be sold as a product independently. In the existing flotation process, the flotation product is generally dehydrated by a conventional membrane filter press, the squeezing pressure is not more than 1.0Mpa, the water content of a filter cake is generally 20-24%, the calorific value is low, and the calorific value of the final middling product can be influenced after the middling product is doped.
4) And a third flotation, wherein the third flotation machine 5 adopts a three-chamber flotation machine, tailings of the third flotation machine 5 can return to the secondary flotation machine 3, and can also be directly fed into a second thickener 9, the third flotation concentrate is fed into a second filter press 6 as high-ash concentrate, filtrate of the second filter press 6 is used as dilution water of the secondary flotation machine 3, and a dehydration product of the filtrate is used as high-ash clean coal 12. In the existing flotation process, the flotation clean coal is generally dewatered by a conventional membrane filter press, the pressing pressure is not more than 1.0Mpa, the water content of a filter cake is generally 20-24%, and the influence on the water content of a final clean coal product is large after the clean coal is doped.
According to the invention, through a three-time coal flotation process, four products of low-ash clean coal, high-ash clean coal, medium coal mud and mud gangue are finally produced, and during production, the ash content of the medium coal slime can be controlled on the premise of ensuring that the ash content of the low-ash clean coal and the high-ash clean coal reaches the production ash content index, and the mud gangue ash content reaches or is greater than the gangue ash content of a coal preparation plant, so that the useful resources in the coal slime can be recovered to the maximum extent.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A three-time coal flotation process is characterized by comprising the following steps:
1) pretreating, namely feeding slime water of a production system into a primary flotation pulp preprocessor after coarse cutting treatment, taking the slime water as a flotation feed after size mixing and mineralization, and then feeding the slime water into a primary flotation machine for primary flotation;
2) performing primary flotation, wherein concentrate in one chamber to three chambers of the primary flotation machine is treated according to the ash content, if the ash content is less than or equal to 8.5%, the concentrate is defoamed and directly used as low-ash concentrate for pressure filtration, and if the ash content is more than 8.5%, the concentrate automatically flows into a secondary flotation machine after being defoamed and size-mixed; directly feeding high-ash concentrates in four chambers and five chambers of the primary flotation machine into a secondary flotation machine; the tailings of the primary flotation machine enter a first thickener, the underflow of the first thickener is fed into a first filter press, and the product after filter pressing is used as mud gangue;
3) performing secondary flotation, wherein concentrate from a first chamber to a second chamber of the secondary flotation machine is used as low-ash clean coal; the third chamber concentrate is processed according to the ash content, if the ash content is less than or equal to 8.5 percent, the concentrate is defoamed and then directly used as low ash concentrate to be fed into a pressure filtration link, the product of the pressure filtration is low ash clean coal, and if the ash content is more than 8.5 percent, the concentrate is defoamed and then fed into a tertiary flotation machine; directly feeding the concentrate in the fourth chamber into a third flotation machine; feeding tailings of the secondary flotation machine into a second thickener, feeding underflow of the second thickener into a third filter press, and taking a filter-pressed product as medium coal slime;
4) and performing tertiary flotation, wherein the tertiary flotation machine adopts a three-chamber flotation machine, the tertiary flotation concentrate is used as high-ash concentrate and fed into a second filter press, and the dehydration product is used as high-ash clean coal.
2. The process of claim 1), wherein the size fraction of the cut-off particles in the step 1) is 0.5-0mm or 0.25-0 mm.
3. The process of claim 1, wherein the second thickener is a middlings thickener.
4. The process of claim 1, wherein the second filter press is a single chamber feed air cross-flow filter press.
5. The process of claim 1, wherein the tailings of the tertiary flotation machine are returned to the secondary flotation machine or directly fed to the second thickener.
6. The triple coal flotation process according to claim 1, wherein the overflow of the first thickener is used as circulating water of the coal flotation process.
7. The tertiary coal flotation process according to claim 1, wherein the overflow of the second thickener and the filtrate of the third filter press are used as circulating water in the coal flotation process.
8. The process of claim 1, wherein the filtrate from the second filter press is used as dilution water for the second flotation machine.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114522804A (en) * | 2022-02-18 | 2022-05-24 | 盘州市翔宇资源回收有限公司 | Fine coal slime separation process method |
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| SU1755704A3 (en) * | 1988-09-29 | 1992-08-15 | Дипл.Инж.Хайнц Хельтер (Фирма) | Plant for preparation of pond-flotation coal slime |
| CN104138808A (en) * | 2014-08-19 | 2014-11-12 | 四川达竹煤电(集团)有限责任公司渡市选煤发电厂 | Three-product flotation coal preparation technique |
| CN108855586A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of Unit erriger of coal floatation |
| CN112371351A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Fine coal slime deep processing technology |
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- 2021-04-23 CN CN202110443587.3A patent/CN113210133A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1755704A3 (en) * | 1988-09-29 | 1992-08-15 | Дипл.Инж.Хайнц Хельтер (Фирма) | Plant for preparation of pond-flotation coal slime |
| CN104138808A (en) * | 2014-08-19 | 2014-11-12 | 四川达竹煤电(集团)有限责任公司渡市选煤发电厂 | Three-product flotation coal preparation technique |
| CN108855586A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of Unit erriger of coal floatation |
| CN112371351A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Fine coal slime deep processing technology |
Non-Patent Citations (1)
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| 许华等: "煤泥二次浮选、精煤泥两段回收流程在梗阳选煤厂的应用", 《煤炭加工与综合利用》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114522804A (en) * | 2022-02-18 | 2022-05-24 | 盘州市翔宇资源回收有限公司 | Fine coal slime separation process method |
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Application publication date: 20210806 |