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

Active Publication Date: 2014-05-28

TAIYUAN UNIV OF TECH

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AI-Extracted Technical Summary

Problems solved by technology

However, for (ultra) finely ground heavy separation coal, the effect of conventional flotation is poor. If selective flocculation flotation is used, that is, in addition to collectors and foaming agents, flocculatio...

Abstract

The invention discloses a coking middling coal coarse grinding and floatation method and belongs to the field of a coal washing and dressing technology. Firstly, granularity of heavy medium middling coal in a coal preparation plant is reduced below 3mm through crushing; then, wet ore grinding is carried out by a ball mill, and granularity of the material is less than 0.5mm after ore grinding; and finally, recovery is conducted by a floatation method. The method provided by the invention is mainly characterized by coarse ore grinding and drug-free floatation. The method has advantages of low energy consumption, simple operation and low investment and operation costs.

Application Domain

FlotationGrain treatments

Technology Topic

Ball millEngineering +1

Image

Examples

Experimental program(4)

Example Embodiment

[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 collector, and sec-octanol is the foaming agent, and the unit flotation test is performed ; When the amount of secondary octanol is 20 g/t, the flotation results under different amounts of kerosene are shown in Table 1;

[0028] (6) Clean coal and tailings are filtered and dehydrated separately for recovery.

[0029] Table 1 Unit flotation test of coal samples in coarse grinding

[0030]

[0031] It can be seen from Table 1 that even under extremely low dosage conditions (ie 30g/t kerosene and 20g/t sec-octanol), the ash content of clean coal is still greater than 11.0%.

[0032] In this example, only a flotation scheme with kerosene and secondary octanol as reagents is provided, and the ash content of the best quality clean coal still reaches 11.71%.

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 to adjust the slurry concentration to 60 g/L;

[0040] (5) The conventional flotation machine is used for sorting, and there is no need to add any chemicals, and clean coal of qualified quality can be obtained in one sorting;

[0041] The flotation experiment adopts XFDM-1.5 single cell flotation machine, the cell volume is 1.5L, and the spindle speed is 1800 r/min;

[0042] (6) Clean coal and tailings are filtered and dehydrated separately for recovery.

[0043] The flotation process does not add drugs, and relies on the natural flotability of useful components for flotation. The test results are shown in Table 2.

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.

PUM

Property	Measurement	Unit
Granularity	<= 0.5	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

short grinding time
Improve utilization efficiency

Polishing disk, polishing device and high-brightness abrasion-resistant metal mirror surface rough polishing technology

InactiveCN105666315AThe amount of grinding is easy to controlshort grinding time

Owner:KESEN SCI & TECH DONGTAI CO LTD

Coking middling coal coarse grinding and flotation method in coking

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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