CN113171882A - Method for improving dewatering performance of flotation clean coal - Google Patents
Method for improving dewatering performance of flotation clean coal Download PDFInfo
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- CN113171882A CN113171882A CN202110429094.4A CN202110429094A CN113171882A CN 113171882 A CN113171882 A CN 113171882A CN 202110429094 A CN202110429094 A CN 202110429094A CN 113171882 A CN113171882 A CN 113171882A
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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
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Abstract
The invention discloses a method for improving the dewatering performance of flotation clean coal, which comprises the following steps: (1) the coal slime water enters a flotation system, the floated tailing enters a tailing muddy water treatment system, and the floated clean coal and the temperature-sensitive filter aid enter a clean coal buffer barrel together; (2) introducing hot steam into the clean coal buffer barrel to increase the temperature of the ore pulp of the clean coal to be higher than the cloud point temperature of the temperature-sensitive filter aid; (3) and starting a filter pressing feeding pump, feeding the heated ore pulp into a filter press, feeding filter liquor obtained after filter pressing into a circulating water tank, and selling the dehydrated clean coal serving as a product. On the basis of ensuring the existing process of a coal preparation plant, the temperature-sensitive filter aid is added to widen the particle size of the clean coal particles, hot steam is introduced, the viscosity of ore pulp is favorably reduced, the defoaming effect is realized, the surface hydrophobicity of the clean coal can be ensured, the moisture of the flotation clean coal product is obviously reduced, and the dehydration efficiency of the clean coal is effectively improved.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a method for improving the dewatering performance of flotation clean coal.
Background
In 2020, the raw coal yield of China reaches 39.0 hundred million tons, and the coal consumption accounts for 56.8 percent of the total energy consumption. Coal still occupies a very important position in national economy and social development. However, with the continuous improvement of the mechanization degree of coal mining, the proportion of fine coal slime in selected raw coal is continuously increased, and fine coal slime accounts for about 25-30% of the raw coal. Along with the increasing requirements of coal dressing in China, the washing rate of coal slime is increased year by year, and the position of flotation in a coal dressing plant is more and more important.
The coal preparation plant generally mixes flotation clean coal and gravity concentration clean coal to be sold as commercial coal, on one hand, the gravity concentration clean coal is back-watered due to overhigh water content of the flotation clean coal, and on the other hand, the agglomeration phenomenon is generated due to high water content of the flotation clean coal, so that the uniform mixing is difficult, and the sale is influenced. At present, the following three methods are mainly adopted to reduce the water content of clean coal in China: (1) the clean coal dehydration system is reformed, and a quick-opening diaphragm filter press and other equipment are used for replacing a disc vacuum filter. (2) The concentration of ore pulp or the feeding property, such as thickening and the like, is changed. (3) The filter aid is added into the pulp, and the filter aid can change the property of the pulp, thereby reducing the filtration time or reducing the water content of a filter cake. The method brings about process change, high reconstruction cost or no obvious reduction of water content of clean coal. Therefore, under the condition of not changing the existing process condition, how to further reduce the moisture of the flotation clean coal filter cake is necessary to ensure the clean coal moisture index.
Disclosure of Invention
The invention aims to provide a method for improving the dewatering performance of flotation clean coal, so as to solve the problem of high water content of a filter cake during dewatering of the flotation clean coal.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for improving the dewatering performance of flotation clean coal comprises the following steps:
(1) the coal slime water enters a flotation system, the floated tailing enters a tailing muddy water treatment system, and the floated clean coal and the temperature-sensitive filter aid enter a clean coal buffer barrel together;
(2) introducing hot steam into the clean coal buffer barrel to increase the temperature of the ore pulp of the clean coal to be higher than the cloud point temperature of the temperature-sensitive filter aid;
(3) and starting a filter pressing feeding pump, feeding the heated ore pulp into a filter press, feeding filter liquor obtained after filter pressing into a circulating water tank, and selling the dehydrated clean coal serving as a product.
Preferably, the temperature-sensitive filter aid in the step (1) is polymer poly (NIPAM-co-DMAPMA) or polymer poly (DEAAM-co-DMAPMA), and the molecular weight is 600-800 ten thousand.
Poly (NIPAM-co-DMAPMA) is obtained by taking N-isopropylacrylamide (NIPAM) (95 mol%) and N- (3-dimethylaminopropyl) methacrylamide (DMAPMA) (5 mol%) as monomers and adopting an oxidation-reduction initiation system for free radical polymerization.
Poly (DEAAM-co-DMAPMA) is obtained by taking N, N-diethyl-2-acrylamide (DEAAM) (95 mol%) and N- (3-dimethylaminopropyl) methacrylamide (DMAPMA) (5 mol%) as monomers and adopting an oxidation-reduction initiation system to carry out free radical polymerization.
More preferably, the dosage of the temperature-sensitive filter aid is 15-20 g/t.
Preferably, the concentration of the coal slime water in the step (1) is 60-80 g/L.
Preferably, the concentration of the clean coal after the flotation in the step (1) is 150-200 g/L.
Compared with the prior art, the invention can widen the particle size of the clean coal particles by adding the temperature-sensitive filter aid on the basis of ensuring the prior process of a coal preparation plant, introduces hot steam, is beneficial to reducing the viscosity of ore pulp, has a defoaming effect and ensures the surface hydrophobicity of the clean coal. The water content of the flotation clean coal product is obviously reduced, the water content of the clean coal is lower than 20%, the water content is reduced by more than 15%, the dehydration efficiency of the clean coal is effectively improved, and the flotation clean coal dewatering method has the characteristics of simple process modification, obvious effect and the like.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Comparative example
The conventional flotation clean coal dehydration comprises the following steps:
(1) coal slime water with the concentration of 60-80g/L enters a flotation system, tailing after flotation enters a tailing slurry treatment system, and clean coal after flotation with the concentration of 150-;
(2) and starting a feeding pump of the filter press, feeding the ore pulp in the buffer barrel into the filter press for dehydration, taking the dehydrated clean coal as a product, and feeding the filtrate into a circulating water tank.
The working period of the filter press is 1200-1500s, and the water content of the filter cake is maintained at 22-25%.
Example 1
As shown in fig. 1, the method for improving the dewatering performance of the flotation clean coal in the embodiment comprises the following steps:
(1) coal slime water with the concentration of 60-80g/L enters a flotation system, tailing coal after flotation enters a tailing coal mud water treatment system, cleaned coal after flotation has the concentration of 150-;
the poly (NIPAM-co-DMAPMA) adopted in the embodiment is obtained by taking N-isopropylacrylamide (NIPAM) (95 mol%) and N- (3-dimethylaminopropyl) methacrylamide (DMAPMA) (5 mol%) as monomers and adopting an oxidation-reduction initiation system to carry out free radical polymerization, wherein the molecular weight is 600-800 ten thousand, and the cloud point temperature is 45 ℃;
(2) introducing hot steam into a clean coal buffer barrel, and heating the temperature of ore pulp to be more than 45 ℃;
(3) and starting a filter pressing feeding pump, feeding the heated ore pulp into a filter press for dehydration, taking the dehydrated clean coal as a product, and feeding the filtrate into a circulating water tank.
Compared with the comparative example, the filter pressing period is reduced to 800-1000s, the water content of the filter cake is reduced to 16-20%, and the water content is reduced by more than 20%.
Example 2
As shown in fig. 1, the method for improving the dewatering performance of the flotation clean coal in the embodiment comprises the following steps:
(1) coal slime water with the concentration of 60-80g/L enters a flotation system, after flotation, the concentration of flotation clean coal is 150-;
the poly (DEAAM-co-DMAPMA) adopted in the embodiment is obtained by taking N, N-diethyl-2-acrylamide (DEAAM) (95 mol%) and N- (3-dimethylaminopropyl) methacrylamide (DMAPMA) (5 mol%) as monomers and adopting an oxidation-reduction initiation system to carry out free radical polymerization, wherein the molecular weight is 600-800 ten thousand, and the cloud point temperature is 37 ℃;
(2) introducing hot steam into a clean coal buffer barrel, heating the ore pulp to above 37 ℃,
(3) and starting a filter pressing feeding pump, feeding the heated ore pulp into a filter press for dehydration, feeding filter liquor obtained after filter pressing into a circulating water tank, and taking the dehydrated clean coal as a product.
Compared with the comparative example, the filter pressing period is reduced to 900-1100s, the water content of the filter cake is reduced to 18-20%, and the water content is reduced by more than 15%.
Claims (5)
1. The method for improving the dewatering performance of the flotation clean coal is characterized by comprising the following steps:
(1) the coal slime water enters a flotation system, the floated tailing enters a tailing muddy water treatment system, and the floated clean coal and the temperature-sensitive filter aid enter a clean coal buffer barrel together;
(2) introducing hot steam into the clean coal buffer barrel to increase the temperature of the ore pulp of the clean coal to be higher than the cloud point temperature of the temperature-sensitive filter aid;
(3) and starting a filter pressing feeding pump, feeding the heated ore pulp into a filter press, feeding filter liquor obtained after filter pressing into a circulating water tank, and selling the dehydrated clean coal serving as a product.
2. The method for improving the dewatering performance of flotation clean coal according to claim 1, wherein the temperature-sensitive filter aid in the step (1) is polymer poly (NIPAM-co-DMAPMA) or polymer poly (DEAAM-co-DMAPMA) and has a molecular weight of 600-800 ten thousand.
3. The method for improving the dewatering performance of flotation clean coal according to claim 2, wherein the amount of the temperature-sensitive filter aid is 15-20 g/t.
4. The method for improving the dewatering performance of flotation cleaned coal according to claim 1, wherein the concentration of the coal slurry in the step (1) is 60-80 g/L.
5. The method for improving the dewatering performance of flotation clean coal as claimed in claim 1, wherein the concentration of clean coal after flotation in step (1) is 150-200 g/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110429094.4A CN113171882A (en) | 2021-04-21 | 2021-04-21 | Method for improving dewatering performance of flotation clean coal |
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| CN202110429094.4A CN113171882A (en) | 2021-04-21 | 2021-04-21 | Method for improving dewatering performance of flotation clean coal |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008348262A1 (en) * | 2008-01-14 | 2009-07-23 | The University Of Melbourne | Flotation aids and processes for using the same |
| CN103240168A (en) * | 2013-05-08 | 2013-08-14 | 中国矿业大学 | Grading separation and dehydration method for high-ash difficult-separation coal slime |
| CA2770347A1 (en) * | 2012-03-02 | 2013-09-02 | The Governors Of The University Of Alberta | Temperature switchable polymers for fine coal dewatering |
| CN103641225A (en) * | 2013-12-06 | 2014-03-19 | 沈阳华盈环保材料有限公司 | Instant flocculating agent and preparation method thereof |
| CN103977909A (en) * | 2014-01-29 | 2014-08-13 | 山东东山王楼煤矿有限公司 | High-argillization coal washing agent |
| CN109530096A (en) * | 2019-01-07 | 2019-03-29 | 山西潞安集团余吾煤业有限责任公司 | A kind of floatation clean coal flocculation filter-press dehydration new process |
-
2021
- 2021-04-21 CN CN202110429094.4A patent/CN113171882A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008348262A1 (en) * | 2008-01-14 | 2009-07-23 | The University Of Melbourne | Flotation aids and processes for using the same |
| CA2770347A1 (en) * | 2012-03-02 | 2013-09-02 | The Governors Of The University Of Alberta | Temperature switchable polymers for fine coal dewatering |
| CN103240168A (en) * | 2013-05-08 | 2013-08-14 | 中国矿业大学 | Grading separation and dehydration method for high-ash difficult-separation coal slime |
| CN103641225A (en) * | 2013-12-06 | 2014-03-19 | 沈阳华盈环保材料有限公司 | Instant flocculating agent and preparation method thereof |
| CN103977909A (en) * | 2014-01-29 | 2014-08-13 | 山东东山王楼煤矿有限公司 | High-argillization coal washing agent |
| CN109530096A (en) * | 2019-01-07 | 2019-03-29 | 山西潞安集团余吾煤业有限责任公司 | A kind of floatation clean coal flocculation filter-press dehydration new process |
Non-Patent Citations (1)
| Title |
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| D.E.詹金森: "煤浆用加压过滤机脱水", 《选煤技术》 * |
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Application publication date: 20210727 |