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Coal slime filter pressing method

A technology of coal slime and filtration method, applied in the field of coal slime filter press, can solve the problems affecting the use of circulating water in the plant area, shortening the time of cake formation, and high cost of chemicals, and achieves the advantages of shortening the time of cake formation, shortening filtration time, and reducing equipment investment. Effect

Inactive Publication Date: 2019-07-12
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the filter-assisted dehydration method for tailing coal slime water is mainly to shorten the time of cake formation by adding suitable coagulants and flocculants. However, the above methods require a large amount of chemicals, which has a great impact on water quality and affects the circulating water in the plant area. use, and the cost of medicine is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1. The gangue minerals in the coal slime treated in this embodiment are mainly clay minerals.

[0015] a. Add the coal slime into the mixing bucket and stir.

[0016] b. Add the prepared quartz particles into the coal slurry and continue to stir. The particle size of the added quartz particles is below 0.074mm. Quartz particles are added in an amount of 30% of the mass percentage of coal slime dry ore in the coal slime.

[0017] c. Pressurize and filter the mixed pulp, and filter with negative pressure.

Embodiment 2

[0018] Embodiment 2. It is basically the same as in Embodiment 1, except that the quartz particles are added in an amount of 5% of the mass percentage of the dry coal slime in the coal slime.

[0019] Embodiment 2. It is basically the same as Embodiment 1, except that: add quartz particles according to the mass percentage of 90% of the dry coal slime in the coal slime.

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Abstract

The invention discloses a coal slime filter pressing method. Quartz particles are added to keep stirring in a coal slime stirring process; and mixed ore pulp is filtered. The particle size of the quartz particles is 0.074 mm or below, and the added quartz amount accounts for 5%-90% of coal slime dry ores in the coal slime. Pressure filtration and negative pressure suction filtration are adopted. The method disclosed by the invention is mainly suitable for coal slime treatment in which gangue minerals are mainly clay minerals, the clay minerals in the coal slime and the added quartz particles can be agglomerated under the action of Van der Waals' force and electrostatic force, the high-density large agglomerates are favorable for filtering tailings, and the cake forming time is greatly shortened.

Description

technical field [0001] The invention relates to a coal slime pressure filter method, in particular to a method for achieving filter aid effect by adding quartz particles into coal slime. Background technique [0002] Coal is the most important energy source in my country, and its dominant position in the primary energy consumption structure will not change for a long time in the future. In order to meet the energy demand of rapid economic development, the amount of coal mining is increasing year by year, and the task of coal washing is very arduous. With the improvement of the degree of coal mining mechanization, the depth of coal mine mining continues to deepen; the characteristics of my country's coal resources are fine, miscellaneous, and difficult, and the proportion of coal slime in raw coal is increasing. Flotation is currently the most mature and effective method for sorting coal smaller than 0.5 mm, and is widely used in industrial production. After flotation separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/00
CPCB01D37/00
Inventor 李懿江夏文成谢广元彭耀丽沙杰郑康豪
Owner CHINA UNIV OF MINING & TECH