Three-section four-product heavy media coal preparation process
A technology of dense medium coal preparation and three products, which is applied in solid separation, wet separation, chemical instruments and methods, etc., can solve the problems of low calorific value and cannot be used directly, and achieve the effect of saving coal resources
Inactive Publication Date: 2014-01-01
刘立文
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The calorific value of gangue is about 2000 kcal / kg. Such gangue is used for power generation and combustion, and its calorific value is somewhat low; if it is used as a raw material for building materials, it also contains 30% combustible products, which cannot be directly used
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[0019] From figure 2 , 3 It can be seen that the three-stage dense medium coal preparation system of the present invention includes two-stage cyclones, which are respectively the first section 1 of the cyclone and the second section 2 of the cyclone, and a buffer box is added at the end of the second section 2 of the cyclone 4. After the buffer tank 4, add the third section 3 of the cyclone, and the input density in the third section 3 of the cyclone is 1.7g / cm 3 For the left and right dense medium suspension XF, the feeding pressure should not be lower than 0.1MPa.
[0020] From figure 1 It can be seen that the separation process of the present invention is: after the raw coal YM enters the first section 1 of the cyclone, the qualified clean coal JM is first sorted out under the swirling action of the suspension XF, and the remaining materials enter the second section of the cyclone 2 points to select the medium coal ZM, and the remaining materials enter the third sectio...
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The invention discloses a three-section four-product heavy media coal preparation process. A buffering tank is additionally arranged at the tail of a second section of a two-section heavy media coal preparation system, and a third-section whirlcone is additionally arranged behind the buffering tank. Qualified clean coal is firstly separated out under the rotational flow effect of suspension liquid after raw coal enters a first section of the whirlcone, and the rest of materials enter the second section of the whirlcone. Middle coal is separated out in the second section of the whirlcone, and then the rest of materials enter a third section of the whirlcone through the buffering tank. Electricity coal is separated out in the third section of the whirlcone, and then residual gangue with low calorific value is discharged through a bottom flowing port of the third section of the whirlcone. By means of the three-section four-product heavy media coal preparation process, the qualified clean coal and the middle coal in the traditional process can be obtained, the electricity coal with about 60% of ash content can be obtained, the ash content in the wasted gangue is improved to more than 80%, the calorific value is reduced below 800cal, and coal resources are saved maximumly.
Description
technical field [0001] The invention belongs to the technical field of coal preparation. Background technique [0002] Whether it is the jigging method or the dense medium method, the traditional coal preparation process generally adopts a two-stage three-product dense medium coal preparation process except for coal slime. The coal preparation system adopted by the coal preparation process is a two-stage three-product heavy medium separation Coal, two-stage three-product dense medium coal preparation The cyclone has only two stages, and only produces three products: clean coal, medium coal and gangue. The ash content of clean coal is about 10%, that of medium coal is about 40%, and that of gangue is 70%. The calorific value of gangue is about 2,000 kcal / kg. Such gangue is used for power generation and combustion, and its calorific value is somewhat low; if it is used as a raw material for building materials, it also contains 30% combustible products, which cannot be directl...
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IPC IPC(8): B03B5/34
Inventor 刘立文许建中荆小明郜伟强南鹏
Owner 刘立文