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A flotation tailing coal-based metallurgical pellet binder and its preparation method

A flotation tail coal and binder technology, applied in the field of mineral processing, can solve problems such as metallurgical pellet binders that have not yet been found, and achieve the effects of long separation time, reduced pollution, and reduced land occupation

Inactive Publication Date: 2019-07-09
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned methods are limited to natural bentonite, and there has been no report on the preparation of metallurgical pellet binders from coal-measure co-associated bentonite.

Method used

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  • A flotation tailing coal-based metallurgical pellet binder and its preparation method
  • A flotation tailing coal-based metallurgical pellet binder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The components of the metallurgical pellet binder based on flotation tailings are as follows by weight: 85% of purified flotation tails, 8% of hydroxypropyl starch ether, 2% of sodium lignosulfonate, and 5% of sodium carbonate; uniform particle size ≤0.045mm;

[0033] The preparation method is:

[0034] The flotation tailings with particle size ≤0.074mm and montmorillonite weight percentage of more than 50% are added with water to make a primary slurry with a weight concentration of 15%, which is then classified and purified by a cyclone group to obtain montmorillonite in the flotation tailings. 70% by weight to obtain a purified flotation tailing coal slurry with a weight concentration of 30%;

[0035] The purified flotation tailing coal mine slurry is added with water to make a secondary slurry with a weight concentration of 20%, and then hydroxypropyl starch ether, sodium lignosulfonate and sodium carbonate with a particle size of ≤0.074mm are added in the above proportion...

Embodiment 2

[0038] The components of the metallurgical pellet binder based on flotation tailings are as follows in weight percentage: purified flotation tailings 90%, hydroxypropyl starch ether 5%, sodium lignosulfonate 2%, sodium carbonate 3%; particle size is uniform ≤0.045mm;

[0039] The preparation method is:

[0040] The flotation tailings with particle size ≤0.074mm and montmorillonite weight percentage of 51% or more are added with water to make a primary slurry with a weight concentration of 16%, which is then graded and purified by a cyclone group to obtain montmorillonite in the flotation tailings. 71% by weight to obtain a purified flotation tailing coal slurry with a weight concentration of 31%;

[0041] The purified flotation tailing coal mine slurry is supplemented with water to make a 21% weight concentration secondary slurry, and then hydroxypropyl starch ether, sodium lignosulfonate and sodium carbonate with a particle size ≤0.074mm are added in the above proportions, and the ...

Embodiment 3

[0044] The components of the metallurgical pellet binder based on flotation tailings are as follows: 87% of purified flotation tails, 6% of hydroxypropyl starch ether, 3% of sodium lignosulfonate, 4% of sodium carbonate; uniform particle size ≤0.045mm;

[0045] The preparation method is:

[0046] The flotation tailings with a particle size of ≤0.074mm and a weight percentage of montmorillonite of more than 53% are added with water to make a primary slurry with a weight concentration of 17%, which is then graded and purified by a cyclone group to obtain montmorillonite in the flotation tailings. 73% by weight to obtain a purified flotation tailing coal slurry with a weight concentration of 32%;

[0047] The purified flotation tailing coal mine slurry is added with water to make a secondary slurry with a weight concentration of 22%, and then hydroxypropyl starch ether, sodium lignosulfonate and sodium carbonate with a particle size of ≤0.074mm are added according to the above ratio, a...

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Abstract

A flotation tailings-based metallurgy pellets binder and a preparation method thereof belong to the technical field of mineral processing. Raw materials of the binder comprise (by weight): 85-90% of purified flotation tailings, 5-8% of hydroxypropyl starch ether, 2-3% of sodium lignosulfonate, and 3-5% of sodium carbonate. Granularity of the ingredients is less than or equal to 0.045 mm. The preparation method comprises the following steps: (1) adding water to flotation tailings to prepare primary pulp, and carrying out fractional purification through a cyclone to obtain purified flotation tailings pulp; (2) adding water to prepare secondary pulp, adding hydroxypropyl starch ether, sodium lignosulfonate and sodium carbonate, and stirring to prepare binder slurry; and (3) drying, grinding and activating. The prepared binder can help reduce dosage of the binder in metallurgy pellets effectively, and drop strength of the obtained fresh pellets, compressive strength of the fresh pellets, decrepitation temperature, strength of preheated pellets and compressive strength of finished pellets are all obviously enhanced. Meanwhile, the pollution of flotation tailings to the environment is reduced.

Description

Technical field [0001] The invention belongs to the technical field of mineral processing, and specifically relates to a flotation tailing coal-based metallurgical pellet binder and a preparation method thereof. Background technique [0002] There is a huge demand for coking coal in my country, but there is a shortage of resources and some high-ash and high-sulfur coking coal can only be used as thermal coal, resulting in a lot of waste of rare resources; flotation is the most effective method for separating fine coal and is widely used Coking coal slime separation. For example: Taiyuan University of Technology, China University of Mining and Technology and other universities have applied for related invention patents on slime flotation, such as "a flotation process for high-ash and difficult-to-float coal slime" (CN201410607611.2), "a slime flotation process" Process” (CN201010125831.3), and “Flotation Process Method of High Ash Fine Coal Slime” (CN201310034282.2), etc.; these m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
CPCC22B1/242
Inventor 李彩霞白阳董庆国任瑞晨李秀晨赵靖雨陈康王志恒刘高全郑忠宇王冬旭宋王芳
Owner LIAONING TECHNICAL UNIVERSITY
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