After drying process, the water content of the coal slurry is greatly reduced, and the calorific value is increased, which improves the its value-in-use, and reduces the operating cost of the power plant. In addition, if the dried slime is briquetted by a briquette machine, it can fully burn to improve the boiler combustion efficiency, operation economy and reliability. In short, the coal slurry drying and briquetting is the best way to achieve the goal of turning waste into treasure.
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Coal slurry is always produced with high-quality clean coal products in the process of raw coal beneficiation. It is difficult to utilize because of high water content, high viscosity, and low calorific value.
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This kind of coal slime is generally a kind of waste, and its properties are similar to those of coal gangue.
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This type of coal slurry is mainly either accompanies by steam coal at the beneficiation process or is produced after coal hydraulic transmission. This type of coal slime is even better than the raw coal, and you can mix a small quantity with the finished coal product.
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This coal slurry is dirty but of better quality than floatation coal slime made at coking coal preparation plant.
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Most coal slurry with high viscosity has a certain fluidity, which makes it difficult to stack, store and transport. Especially when being piled up, it is extremely unstable, thereby running off when it meets water, and flying away when it is dry.
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The result is not only a waste of precious coal resources, but also serious environmental pollution, and sometimes even the restricted normal production of coal washing plants.
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However, such comprehensive utilization power plants develop slowly, and are difficult to get construction approval. Whats more, because coal slurry is dispersed in various coal preparation plants, it is difficult to be concentrated, plus needs long-distance transportation, thus resulting in obstacles to completely digest a large amount of coal slime.
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That way will lower the quality of the commercial coal, increase the ash and water content, and result in the increase of the transportation cost. Besides, it will also lead to clogging of the slime and the difficulty of unloading. In conclusion, extensive treatment badly impacts the effect of raw coal beneficiation.
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The best results were obtained using flotation process. Coal slurry deposits represent some energy potential defined by the heat content. The energy potential was calculated for each analysed slurry impoundment Table 3. The energy potential of the obtained beneficiation products was also calculated.
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Coal beneficiation is based on wet physical processes such as gravity separation and flotation. Beneficiation produces two waste streams fine materials that are discharged as a slurry to a tailings impoundment, and coarse material typically greater than 0.5 millimeters mm that is hauled away as a
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Dry coal beneficiation has an inherent advantage since it uses no process water and reduces the costs that are associated with process water, fines dewatering and slurry confinement. In particular, dry coal beneficiation is more suitable for coal cleaning in dry regions that lack available processing water.
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Jan 01, 2018nbsp0183321. Introduction. Coal plays a vital role in global energy mix. In 2015, coals share of global primary energy consumption is 29.2 .Coal beneficiation can improve coal quality by removing the gangue minerals and is the most effective and economic method for clean processing of coal resources , , , .In the last several decades, the yields of 6 mm coal during coal mining increase ...
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COAL BENEFICIATION - cmpdi. 2020-7-26 Barrel Washer Using Coal Slurry as Media At present Indian coals are washed in heavy media plants using magnetite as separating medium or in jig plants or plants with a combination of the two. The cost of operation of the conventional washeries was found to be increasing at a rapid rate over the years.
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A method of beneficiating a particulate carbonaceous material such as coal, including formation of a slurry of the material in an aqueous salt solution. The slurry is separated in a cyclone into a low-density fraction and a high-density fraction with the low-density fraction having particulate carbonaceous material with a lower sulfur content and lower ash content than the particulate ...
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This invention relates to coal beneficiation and particularly relates to a process of coal beneficiation wherein an agent used in connection with reducing the sulfur and mineral content of coal is also beneficial to later processes involving combustion, gasification or molten caustic leaching.
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Coal beneficiation has been useful to make coal a more flexible and desirable fuel for use in coal-water mixtures for utility or industrial boilers and for use as dry
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particulate fuels for diesel or gas turbine applications. Beneficiation is also helpful to reduce both sulfur and particulate emissions from all sources of coal utilization.
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Producing such low-ash and low-sulfur fuels for these applications requires complete or near-complete liberation of mineral matter from the coal. The coal, when mined, contains various amounts of sulfur and mineral or stone matter, and by mineral matter, it is intended to include ash as well as pyrites which also contain sulfur. For advanced applications, cleaning includes grinding the coal to small particle sizes, since it has been found that in the grinding operation, relatively clean coal is
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Jun 15, 2017nbsp018332Ian is a combustion technology specialist with over 30 years experience in the gas, oil and petrochemicals industry. Ian has produced studies for the IEA CCC on lignite power plant technology, coal beneficiation and is currently working on Non-energy uses for coal.
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It has also been recently found that heavy-liquid cyclone separators are useful in the beneficiation of coal. This has been found to be a satisfactory method of cleaning because clean coal is less dense than the mineral or rock associated with the coal. For instance, clean coal has a specific gravity in the area of about 1.2 to 1.3 whereas the minerals contained in the coal or with the coal have
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specific gravities in the area of 2.5 or greater. Pyrites have a specific gravity in the neighborhood of about 5. If a heavy liquid having a specific gravity in the broad general range of greater than about 1.3 to about 1.8 is used as the separating medium in a cyclone, clean coal reports to the overflow and mineral matter reports to the underflow, thereby separating the lighter, cleaner coal from the heavier material having greater mineral or ash content.
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recovered by magnetic separation, since in order for a cleaning process to be economic, the heavy liquid or the magnetite particles which make up the dense medium must be recovered for reuse.
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In order to effectively separate very fine coal in a cyclone, heavy liquids have been used as substitutes for the aqueous magnetite slurries. Typical heavy liquids are freon and halogenated hydrocarbons such as methylene. chloride. Freon has come under attack lately due to environmental concerns resulting from its adverse affect on the ozone layer and methylene chloride has certain alleged
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slurry conduit coal ultrasound modular Prior art date 1995-02-15 Legal status The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Expired - Lifetime Application number US08388,744 Inventor J. Bradley Vujnovic
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