Coking middling coal coarse grinding and flotation method in coking
A flotation method and rough grinding technology, applied in flotation, solid separation, grain treatment, etc., can solve the problems of deteriorating the subsequent tail coal concentration and dehydration effect, complex chemical system, poor flotation effect, etc., and achieve environmental protection. , The effect of low processing cost and energy saving
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[0021] Example 1: Conventional flotation experiment
[0022] According to the conventional flotation method, the specific steps are as follows:
[0023] (1) The heavy-medium coal in the coal preparation plant enters a 3mm grading screen, and the material on the screen is crushed by a crusher, and the output particle size is less than 3mm;
[0024] (2) The crushed product is mixed with the under-sieve of the grading screen, and the slime with a particle size of less than 0.5mm is removed with a desliming screen;
[0025] (3) 3~0.5mm heavy medium coal and water are mixed to form a slurry with a concentration of 65%, and the ball mill is used for wet grinding to achieve basic dissociation of the material;
[0026] (4) Mix the grinding product with -0.5mm coal slime, then add water to adjust the slurry concentration to 80 g / L;
[0027] (5) The flotation experiment adopts XFDM-1.5 single-tank flotation machine, the tank volume is 1.5L, the spindle speed is 1800 r / min; kerosene is used as the ...
Example Embodiment
[0033] Example 2: Flotation experiment without agent
[0034] With the scheme of the present invention, the specific steps are as follows:
[0035] (1) The heavy-medium coal in the coal preparation plant enters a 3mm grading screen, and the material on the screen is crushed by a crusher, and the output particle size is less than 3mm;
[0036] (2) The crushed product is mixed with the under-sieve of the grading screen, and the slime with a particle size of less than 0.5mm is removed with a desliming screen;
[0037] (3) 3~0.5mm heavy medium coal and water are mixed to form a slurry with a concentration of 65%, and the ball mill is used for wet grinding to make the material basically dissociate;
[0038] Parameters of wet grinding: the speed of the mill is 1400r / min, the mass ratio of grinding medium to material is 32.84:1, the grinding time is 2min, and the content of -200 mesh in the grinding product is 33.8%;
[0039] (4) Mix the grinding product with -0.5mm coal slime, then add water ...
Example Embodiment
[0044] Example 3: Flotation experiment without agent
[0045] The specific operation steps of this embodiment are the same as those of embodiment 2, except that in step (4), water is added to adjust the slurry concentration to 80 g / L, and then the flotation method is carried out by the agent-free flotation method. The results are shown in Table 2.
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