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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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, flocculation agents are also required.
This process not only consumes a lot of energy, but also has a complicated chemical system, and may also deteriorate the effect of subsequent concentration and dehydration of tailing coal.

Method used

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  • Coking middling coal coarse grinding and flotation method in coking
  • Coking middling coal coarse grinding and flotation method in coking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 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 the 3mm grading sieve, and the material on the sieve is crushed by the crusher, and the output particle size is less than 3mm;

[0024] (2) The crushed product is mixed with the undersize of the grading sieve, and the coal slime whose particle size is less than 0.5mm is removed by a desliming sieve;

[0025] (3) The 3~0.5mm dense medium coal is mixed with water 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-cell flotation machine with a cell volume of 1.5L and a spindle speed of 1800 r / min; k...

Embodiment 2

[0033] Embodiment 2: No reagent flotation experiment

[0034] Adopt the scheme of the present invention, concrete steps are as follows:

[0035] (1) The heavy medium coal in the coal preparation plant enters the 3mm grading sieve, and the material on the sieve is crushed by the crusher, and the output particle size is less than 3mm;

[0036] (2) The crushed product is mixed with the undersize of the grading sieve, and the coal slime whose particle size is less than 0.5mm is removed by a desliming sieve;

[0037] (3) 3~0.5mm dense medium coal is mixed with water to form a slurry with a concentration of 65%, and the ball mill is used for wet grinding to basically dissociate the material;

[0038] The parameters of wet grinding: the mill speed 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 wate...

Embodiment 3

[0044] Embodiment 3: No reagent flotation experiment

[0045] The specific operation steps of this example are the same as those of Example 2, except that in step (4) water is added to adjust the pulp concentration to 80g / L, and then flotation is carried out by using the chemical-free flotation method. The results obtained are shown in Table 2.

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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.

Description

technical field [0001] The invention relates to a coal slime flotation method, which is especially suitable for the flotation of coking medium coal after crushing and grinding, and belongs to the technical field of coal washing and processing. Background technique [0002] my country is rich in coal resources, but the distribution of coal types and reserves is extremely uneven, and coking coal resources are relatively scarce, especially fat coal and coking coal, whose reserves are extremely limited. At present, the washed medium coal of most domestic coking coal preparation plants is used as fuel due to its high ash content, resulting in a great waste of scarce coal resources. Medium coal is a by-product of the coal washing process, which contains a certain amount of organic components. Because it forms a close companion (para)growth with the inorganic mineral components in coal, the premise of effective re-selection of medium coal is the organic component. Separation of fr...

Claims

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Application Information

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IPC IPC(8): B02C21/00B03D1/00
Inventor 李志红樊金串樊民强王超
Owner TAIYUAN UNIV OF TECH
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