CN1820818A - Low ash coal dewatering method of hydrophobic aggregating and pelletizing to aid filtering - Google Patents
Low ash coal dewatering method of hydrophobic aggregating and pelletizing to aid filtering Download PDFInfo
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- CN1820818A CN1820818A CN 200610037994 CN200610037994A CN1820818A CN 1820818 A CN1820818 A CN 1820818A CN 200610037994 CN200610037994 CN 200610037994 CN 200610037994 A CN200610037994 A CN 200610037994A CN 1820818 A CN1820818 A CN 1820818A
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- dewatering
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Abstract
The low ash coal dewatering process is especially suitable for preparing high grade active carbon with low ash coal. The dewatering process includes the following steps: adding emulsified coal tar and mixing in a high shearing dispersion machine to complete pre-treatment for hydrophobic aggregating and pelletizing of the floated fine coal slurry resulting easy dewatering of coal; and pressurizing filtering or vibration sieving the pre-treated coal slurry to dewater and to obtain product with water content of about 10 %. The product may be kneaded, formed, carbonized and activated directly to produce high grade active carbon. The coal tar serves as both filtering aid and adhesive, and can lower the water content in the product and promote the recovery of filter aid. The present invention has simple technological process, low cost, environment friendship, low power consumption and high dewatering rate.
Description
One, technical field
The present invention relates to the low culm dewatering that hydrophobic agglomeration granulation helps filter, be particularly useful for low culm and prepare top-grade active carbon.
Two, background technology
China is world's coal first big country, and coal accounts for about 75% in the primary energy consumption structure.Along with the continuous development of national economy, coal product has been proposed more and more higher requirement, particularly, also more and more higher to the requirement of moisture in coal.Because difficult separation coal is many in China's raw coal, the ratio of high ash, high sulphur content is great, further reduce the ash content and the sulphur content of floatation clean coal, improve the rate of recovery of cleaned coal, one-tenth ash mineral and pyrite in the coal are fully dissociated, for this reason must coal dust is broken, this has just increased the amount that needs the Bed for Fine Coal of processing.Especially in needing the ultralow culm preparation technology of heavily desulfurating and reducing ash, must be with coal dust broken and be milled down to tens microns even several micron, utilize advanced sorting technology can remove the ash content and the pyrite of the overwhelming majority again, make satisfactory ultralow culm.Because ultralow grey coal particle size is very thin, and the requirement to moisture is very high, as the ultralow culm moisture requirement of active carbon raw material about 10%, and the product moisture that traditional process equipment is handled is too high, for satisfying technological requirement, have only and adopt dry (oven dry is handled) dehydration, moisture is reduced to below 10%, but the cost of this drying and dehydrating is too high.
Conventional dewatering type has mechanical dehydration, and it has mainly comprised several forms such as vacuum filtration, press filtration and pressure filtration.Mechanical dehydration is present most economical dewatering type, so practical application is more, but mechanical dehydration is for the dehydration of the particularly ultra-fine grain of fine material, and effect is not fine.The filter aid dehydration also is a kind of dewatering type commonly used in addition, several modes such as inorganic type filter aid, surfactant type filter aid and flocculation formulation filter aid are arranged, change the characteristic of coal particle surface by the interpolation filter aid, moisture is wherein removed easily, the filter aid dehydration can effectively reduce product moisture, but has the problems such as character that filter aid reclaims difficulty, production cost is high and do not make full use of coal.If filter aid does not reclaim and will influence product quality, medicament wherein also can exert an influence to subsequent technique, and therefore strengthening fine coal dewatering is a problem anxious to be solved in the coal industry.
Three, summary of the invention
In view of the problem that prior art exists, the purpose of this invention is to provide a kind of reduction dehydration difficulty, simplify technological process, the hydrophobic agglomeration granulation that reduces the active carbon manufacturing cost helps the low culm dewatering of filter.
The hydrophobic agglomeration granulation of the present invention helps the low culm dewatering of filter, select floatation clean coal for use, and before floatation clean coal filters, add emulsification coal tar, adopt the high shear dispersion machine that it is mixed to stir and finish preliminary treatment, make floatation clean coal starch hydrophobic reunion, be convenient to moisture in coal and easily deviate from.Pretreated coal slurry material is positioned in the drainage bin (filter), dewaters, obtain moisture and be lower than 10% product with pressing filter or shaking-sieving mode.Emulsification coal tar is formulated by coal tar, water and dodecyl trimethyl amine bromide emulsifier; The preliminary treatment of emulsification coal tar, at first start the high shear dispersion machine and carry out preheating and oil lubrication, guarantee sound abrasive disc temperature in the time of 80 ℃～100 ℃, shutdown is preheating to 60 ℃ of coal tar, water and dodecyl trimethyl amine bromide emulsifying agent by the mass ratio adding, starts colloid mill and carries out interior circulation; The concentration that adds the emulsification coal tar in the floatation clean coal slurry is in the floatation clean coal slurry of 200g/L, adds the emulsification coal tar that accounts for cleaned coal total amount 30%.
The hydrophobic agglomeration granulation of the present invention helps the low culm dewatering of filter, is best suited for low culm and prepares top-grade active carbon.Before floatation clean coal filters, add emulsification coal tar filter aid and carry out preliminary treatment, make coal slurry hydrophobic reunion earlier, strengthen the dehydration of fine beans with this, carrying out pressurizing and dehydrating again filters, just moisture can be reduced in the claimed range, product can directly be mediated, moulding, charing, activating process.Coal tar has played filter aid and two kinds of effects of binding agent, and it not only can reduce product moisture, and helps the recovery of filter aid, has simplified technology, solved the cost problem that a large amount of filter aids bring, its method is simple, environmental protection, low energy consumption, high dehydration rate has practicality widely.
Four, the specific embodiment
The hydrophobic agglomeration granulation of the present invention helps the low culm dewatering of filter, mechanical dehydration and filter aid dehydration are combined, at first as filter aid the material that will filter is carried out hydrophobic agglomeration granulation with coal tar, carry out pressure filtration by pressing filter again, obtain moisture and be lower than 10% product, with product directly mix, moulding, charing, activating process, can obtain final products-novel high-grade active carbon.Because the coal tar flowability is very poor, must carry out emulsification treatment with before it, the emulsification treatment of coal tar adopts colloid mill to finish, earlier additional proportion is about 2 kilograms of 1: 2 machine oil and a diesel oil in colloid mill, start colloid mill, turned round 5～8 minutes, guarantee that sound abrasive disc temperature is in the time of 80 ℃～100 ℃, stop colloid mill, bleed off machine oil and diesel oil, to be preheating to 60 ℃ coal tar in the ratio that in mass ratio is 60: 40: 0.3, circulation is 0.5～1 minute in carrying out in water and the dodecyl trimethyl amine bromide emulsifying agent adding colloid mill, by coal tar is carried out emulsification treatment, makes its flowability strengthen, thereby guaranteed that coal tar can fully contact with coal particle, and, be the enough energy of hydrophobic granule at the abundant drawout of coal particle surface, formed the strong hydrophobic granule of hydrophobicity.Carry out hydrophobic reunion in the emulsification coal tar adding floatation clean coal that will make, the concentration of adding is in the coal slurry of 200g/L, adds the emulsification coal tar that accounts for cleaned coal total amount 30%, uses the high shear dispersion machine, under the 1000rpm mixing intensity, mixes stirring 20min and gets final product.Carry out pressure filtration then,, under the 0.5MPa pressure condition, carry out pressure filtration, can obtain moisture at the product below 10% with the coal slurry of hydrophobic reunion.
Claims (5)
1. hydrophobic agglomeration granulation helps the low culm dewatering of filter, it comprises the coal slurry material is positioned in the drainage bin (filter), dewater with pressing filter or shaking-sieving mode, obtain moisture and be lower than 10% product, it is characterized in that: select floatation clean coal for use, and before floatation clean coal filters, add emulsification coal tar, adopt the high shear dispersion machine that it is mixed to stir and finish preliminary treatment, make floatation clean coal starch hydrophobic reunion, be convenient to moisture in coal and easily deviate from.
2. help the low culm dewatering of filter according to right 1 described hydrophobic agglomeration granulation, it is characterized in that: described emulsification coal tar is formulated by coal tar, water and emulsifier.
3. help the low culm dewatering of filter according to right 2 described hydrophobic agglomeration granulation, it is characterized in that: described emulsifying agent is a dodecyl trimethyl amine bromide.
4. help the low culm dewatering of filter according to right 1,2 or 3 described hydrophobic agglomeration granulation, it is characterized in that: the preliminary treatment of described emulsification coal tar, at first start colloid mill and carry out preheating and oil lubrication, guarantee that sound abrasive disc temperature is in the time of 80 ℃～100 ℃, be preheating to 60 ℃ of coal tar, water and heat emulsifiers by the mass ratio adding, start colloid mill and carry out interior circulation.
5. help the low culm dewatering of filter according to right 1 described hydrophobic agglomeration granulation, it is characterized in that: described is in the floatation clean coal of 200g/L in concentration, adds the emulsification coal tar that accounts for cleaned coal total amount 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610037994XA CN100368053C (en) | 2006-01-20 | 2006-01-20 | Low ash coal dewatering method of hydrophobic aggregating and pelletizing to aid filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610037994XA CN100368053C (en) | 2006-01-20 | 2006-01-20 | Low ash coal dewatering method of hydrophobic aggregating and pelletizing to aid filtering |
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| Publication Number | Publication Date |
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| CN1820818A true CN1820818A (en) | 2006-08-23 |
| CN100368053C CN100368053C (en) | 2008-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200610037994XA Expired - Fee Related CN100368053C (en) | 2006-01-20 | 2006-01-20 | Low ash coal dewatering method of hydrophobic aggregating and pelletizing to aid filtering |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101653674B (en) * | 2008-08-19 | 2011-11-16 | 沈阳铝镁设计研究院有限公司 | Liquid-solid separation process and system for suspending liquid |
| CN108753388A (en) * | 2018-06-28 | 2018-11-06 | 郑翔书 | A kind of preparation method of water-coal-slurry |
| WO2023134612A1 (en) * | 2022-01-17 | 2023-07-20 | 重庆四季金标科技有限公司 | Lignite modification and dehydration method, production process thereof, and application of modified dehydrated lignite |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59105089A (en) * | 1982-12-06 | 1984-06-18 | Harima Kasei Kogyo Kk | Granulation of coal powder in water |
| US5379902A (en) * | 1993-11-09 | 1995-01-10 | The United States Of America As Represented By The United States Department Of Energy | Method for simultaneous use of a single additive for coal flotation, dewatering, and reconstitution |
| US20020166794A1 (en) * | 2001-01-29 | 2002-11-14 | Bronshtein Alexander P. | Apparatus and process for converting refinery and petroleum-based waste to standard fuels |
| US20020144928A1 (en) * | 2001-01-29 | 2002-10-10 | Bronshtein Alexander P. | Energy efficient process for converting refinery and petroleum-based waste to standard fuels |
-
2006
- 2006-01-20 CN CNB200610037994XA patent/CN100368053C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101653674B (en) * | 2008-08-19 | 2011-11-16 | 沈阳铝镁设计研究院有限公司 | Liquid-solid separation process and system for suspending liquid |
| CN108753388A (en) * | 2018-06-28 | 2018-11-06 | 郑翔书 | A kind of preparation method of water-coal-slurry |
| WO2023134612A1 (en) * | 2022-01-17 | 2023-07-20 | 重庆四季金标科技有限公司 | Lignite modification and dehydration method, production process thereof, and application of modified dehydrated lignite |
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| Publication number | Publication date |
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| CN100368053C (en) | 2008-02-13 |
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