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A heavy-floating combined separation process for coking middling coal

A process and sorting technology, applied in the field of mineral processing, can solve the problems of high production cost and complicated process, and achieve the effect of fewer equipment links, simple process and energy saving

Active Publication Date: 2016-10-05
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of them use dense medium cyclone to re-select the crushed coarse medium coal. Since the purification and recovery of the medium are involved, the process is more complicated and the production cost is higher.

Method used

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  • A heavy-floating combined separation process for coking middling coal
  • A heavy-floating combined separation process for coking middling coal
  • A heavy-floating combined separation process for coking middling coal

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Experimental program
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Effect test

Embodiment approach 1

[0034] Implementation Mode 1: Taking the heavy-medium medium coal of A coal preparation plant as the research object, according to figure 1 The re-election "head pulling" technological process operation, the specific steps are:

[0035] (1) Coal crushing in coking

[0036] After being sieved by a grading sieve with a sieve hole of 3mm, use a hammer crusher to crush the 50~3mm sieve material to make the particle size below 3mm;

[0037] (2) Hydrocyclone re-election

[0038] Weigh 13kg of material with a particle size below 3mm, pour it into a mixing tank, and mix it with water to prepare a slurry with a concentration of 100 g / L; through the slurry pump, the slurry enters a new type of water-based cyclone—coal slime cyclone along the tangential direction Gravity separation column (cylinder diameter φ150mm, overflow outlet diameter 45mm, underflow outlet diameter 22mm, overflow pipe insertion depth 100mm), when the feeding pressure is 0.12MPa, the cyclone overflows through the ...

Embodiment approach 2

[0042] Implementation Mode 2: Taking the heavy-medium medium coal of B coal preparation plant as the research object, according to figure 2 Re-select the direct "tail throwing" process to operate, the specific steps are:

[0043] (1) Coal crushing in coking

[0044] After being sieved by a grading sieve with a sieve hole of 3mm, use a hammer crusher to crush the 50~3mm sieve material to make the particle size below 3mm;

[0045] (2) Hydrocyclone re-election

[0046] Weigh 13kg of material with a particle size below 3mm, pour it into a mixing tank, mix it with water to prepare a slurry with a concentration of 100 g / L; use a slurry pump to make the slurry enter the water-mediated cyclone along the tangential direction—coal slime cyclone weight Column selection (cylinder diameter φ150mm, overflow outlet diameter 45mm, underflow outlet diameter 19mm, overflow pipe insertion depth 140mm), when the feeding pressure is 0.12MPa, it can realize reelection "tail throwing", and the th...

Embodiment approach 3

[0050] Implementation Mode 3: For the medium coal whose selectivity is between the dense medium medium coal of A and B coal preparation plants, according to image 3 Gravity separation directly "pulls the head" and "throws the tail", and re-separation ore grinding flotation.

[0051] (1) Coal crushing in coking

[0052] After being sieved by a grading sieve with a sieve hole of 3mm, use a hammer crusher to crush the 50~3mm sieve material to make the particle size below 3mm;

[0053] (2) Hydrocyclone re-election

[0054] Weigh 13kg of material with a particle size below 3mm, pour it into a mixing tank, and mix it with water to prepare a slurry with a concentration of 100 g / L; through the slurry pump, the slurry enters the two-stage new water-mediated cyclone group along the tangential direction— Coal slime cyclone gravity separation column (the diameter of the first and second sections of the cylinder is φ150mm, the diameter of the first section of the overflow port is 40mm, ...

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Abstract

The invention relates to a gravity-flotation joint separation technology for coking middlings and belongs to the technical field of mineral processing. The technology comprises the steps of crushing the coking middlings, water medium whirlcone gravity concentration, and ore grinding-floatation of gravity concentration middle products. The technology is characterized in that the water medium whirlcone is adopted for gravity concentration, so that equipment is few in link and simple in technology; no heavy media need consuming, so that operation cost is low; head pulling or tail throwing is adopted for gravity concentration, so that subsequent ore grinding materials are made to be reduced in number, and energy consumption is saved.

Description

technical field [0001] The invention relates to a fine-grained coal separation process, in particular to a heavy-floating combined separation process for coking medium coal, which belongs to the technical field of mineral processing. Background technique [0002] Medium coal is a by-product of the coal washing process. Its ash content is usually 30-40%, and it contains a certain amount of organic components. Because it forms a close companion and symbiosis with the inorganic minerals in the coal, it needs to be crushed or ground. ore to promote its dissociation. But for the dissociated fine-grained medium coal, there is no efficient separation technology at present, resulting in the medium coal of most coking coal preparation plants in China being used as fuel due to its high ash content, resulting in a great waste of scarce coal resources . In order to make rational use of coal resources, it is imperative to develop high-efficiency re-election technology for coking medium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B03B1/00
Inventor 李志红樊民强董连平王超郭巍
Owner TAIYUAN UNIV OF TECH
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