A process and device for improving the pressure filtration performance of tailing coal slime with coal gasification fine slag
A coal gasification and fine slag technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as increasing production costs, affecting the quality of circulating water in coal preparation plants, and deteriorating production. Achieve smooth operation, improve filter performance, and improve filter efficiency
Active Publication Date: 2021-03-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, the extensive use of chemicals will affect the quality of circulating water in coal preparation plants and deteriorate production
At the same time, it increases the production cost of the enterprise
Method used
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Embodiment
[0034]Perform laboratory filtration test on the underflow of a thickener with high fine mud content, and the slurry concentration is 500kg / m3, Take a sample of 100mL, add 100kg / t of coal gasification fine slag, use the impeller stirrer to fully stir, use the Buchner funnel to carry out the suction filtration test, the test pressure is 0.1MPa, the suction filtration will stop the test when no filtrate is discharged at an interval of 10 seconds. Record the final filtration time as 8 minutes and 20 seconds. Under the same test conditions, filtering was performed without adding coal gasification fines, and the final filtering time was 13 minutes and 50 seconds. The addition of coal gasification fine slag reduces the filtration time by 40%, and significantly improves the filtration speed.
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The invention discloses a process and a device for improving the pressure filtration performance of tailing coal slime by coal gasification fine slag. The fine slag slurry is added to the tailing coal slime slurry and fully mixed; the tailing coal slime slurry added with the coal gasification fine slag slurry is subjected to pressure filtration and dehydration; a part of the filtrate generated in the pressure filtration is used to prepare coal gasification Fine slag slurry. Because the particles of coal gasification fine slag contain a large number of pores, the surface of the particles is relatively rough, and its hydrophobicity is obviously higher than that of tailing coal slime. These properties of coal gasification fine slag form a large number of new "drainage channels" in the tailings slime, which helps the water in the tailings slime to drain quickly, thereby improving the performance of the tailings slime and increasing the efficiency of the filter press.
Description
Technical field[0001]The invention relates to the technical field of coal slime dehydration, in particular to a process and a device for adding coal gasification fine slag to improve the filtering performance of tailing slime.Background technique[0002]At present, in the coal washing and processing, the flotation process is commonly used to separate the fine coal slime. The flotation tailings enter the thickener, after being concentrated, they are dewatered by the filter press, and after dewatering, they become tailings slime products. At the same time, the filter press is also an important link to realize the closed circulation of the slime water in the coal preparation plant. The high content of fine-grained gangue minerals in the tailings and the high potential on the surface of the particles make the treatment of the filter press more difficult. The low efficiency of filter press will inevitably cause an increase in the amount of slime in the slime water system and worsen product...
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IPC IPC(8): C02F11/122
CPCC02F11/122
Inventor 梁龙胡鹏飞谢广元彭耀丽夏文成沙杰倪超
Owner CHINA UNIV OF MINING & TECH