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High-sodium low-rank coal flotation sodium removal method and system

A low-rank coal, sodium removal technology, applied in flotation, chemical instruments and methods, wet separation, etc., can solve the problems of high inertinite content, unfavorable combustion utilization, hydrochloric acid corrosion equipment, etc., to reduce the content of alkali metals , reduce ash content, improve quality and utilization

Active Publication Date: 2021-09-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to solve the problem of high-sodium coal utilization, it is often used for sodium removal pretreatment. Pickling pretreatment is an effective method for sodium removal. Hydrochloric acid is often used as a pickling solution, but hydrochloric acid will corrode equipment, and the added chloride ions are also harmful. element
In addition, low-rank coal burns with long and smoky flames, high inertinite content, high ignition point and burnout temperature, and poor burnout characteristics of coal, which is not conducive to combustion and utilization.

Method used

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  • High-sodium low-rank coal flotation sodium removal method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1: Grinding high-sodium and low-rank coal into fine-grained raw coal of 5-500 μm;

[0028] S2: Add fine-grained raw coal and 70°C, 3% acetic acid solution into the primary slurry mixing tank to make coal slurry. The mass ratio of acetic acid solution to fine-grained raw coal is 10:1, and stir at a speed of 1000r / min. 10 minutes to fully mix the coal slurry, then add n-octanoic acid and fusel alcohol to the primary slurry mixing tank in turn, stir for 3 minutes and 1 minute respectively, feed the prepared coal slurry into the primary flotation machine for flotation, and collect the primary The foam product and the residual pulp of the primary selection complete a flotation process; the primary foam product is medium-sodium concentrate, and the residual pulp of the primary selection is medium-sodium tailings; the primary foam product is washed and filtered to obtain medium-sodium clean coal;

[0029] S3: Add medium-sodium clean coal and 70°C, 3% acetic acid solution into...

Embodiment 2

[0034] S1: Grinding high-sodium and low-rank coal into fine-grained raw coal of 5-500 μm;

[0035] S2: Add fine-grained raw coal and 90°C, 5% acetic acid solution into the primary slurry mixing tank to make coal slurry. The mass ratio of acetic acid solution to fine-grained raw coal is 10:1, and stir at a speed of 1000r / min to prepare the slurry 10 minutes to fully mix the coal slurry, then add n-octanoic acid and fusel alcohol to the primary slurry mixing tank in turn, stir for 3 minutes and 1 minute respectively, feed the prepared coal slurry into the primary flotation machine for flotation, and collect the primary The foam product and the residual pulp of the primary selection complete a flotation process; the primary foam product is medium-sodium concentrate, and the residual pulp of the primary selection is medium-sodium tailings; the primary foam product is washed and filtered to obtain medium-sodium clean coal;

[0036]S3: Add medium-sodium clean coal and 90°C, 5% aceti...

Embodiment 3

[0041] A high-sodium and low-rank coal flotation desodination system, including: a grinding machine 1, the lower part of the grinding machine 1 is connected to a primary selection slurry tank 3 through a fine-grained raw coal conveyor 2, and the primary selection slurry tank 3 enters the flotation tank through the primary selection The pulp pipeline 7 is connected to the primary flotation machine 8, the primary flotation machine 8 is provided with a primary tailings discharge pipeline 9 and a primary concentrate discharge pipeline 10, and the primary flotation machine 8 passes through the primary concentrate discharge pipeline 10 It is connected with the clean coal water washing bucket 11, the clean coal water washing bucket 11 is connected with the concentrate filter 13 through the water washing concentrate discharge pipe 12, and the concentrate filter 13 is connected with the sorting and mixing tank 15 through the clean coal conveyor 14, and the sorting and mixing The barrel ...

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Abstract

The invention discloses a high-sodium low-rank coal flotation sodium removal method and system. The method comprises the steps that primary flotation is conducted through a primary flotation machine, a primary flotation foam product is medium-sodium concentrate, primary flotation residual ore pulp is medium-sodium tailings, and medium-sodium clean coal is obtained after the primary flotation foam product is washed and filtered; the medium-sodium clean coal is subjected to secondary flotation through a separation flotation machine, separated foam products are low-sodium vitrinite-rich concentrate, and separated residual ore pulp is low-sodium inertinite-rich tailings. According to the method, the acetic acid solution is added on the basis of the two-stage flotation process, so that the sodium content can be effectively reduced and no harmful waste gas is generated while coal rock macerals of the coal sample are subjected to flotation separation, the corrosion of acetic acid to production equipment is very small, the service cycle of the equipment is basically not influenced, and the method is safe and green. According to the method, the sodium content in the high-sodium coal can be effectively reduced while the good flotation enrichment effect can be guaranteed, the quality of the coal is improved, and considerable economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of coal desodination, in particular to a method and system for flotation and desodination of high-sodium and low-rank coal. Background technique [0002] High-sodium coal refers to a special type of coal with a high content of alkali metal compounds in coal. Among all kinds of alkali metal compounds, sodium-based compounds are generally the majority, so it is called high-sodium coal. In China, Australia, the United States, Germany, etc. The land has a certain amount of reserves. Alkali metals such as sodium in high-sodium coal will exist in the flue gas in the form of steam after combustion, which will easily cause many problems when the boiler burns high-sodium coal. Therefore, in order to solve the problem of high-sodium coal utilization, it is often used for sodium removal pretreatment. Pickling pretreatment is an effective method for sodium removal. Hydrochloric acid is often used as a pickling solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00B03D1/018B03D1/14B03D101/04B03D101/02B03D103/08
CPCB03B7/00B03B9/005B03D1/018B03D1/14B03D1/08B03D2201/04B03D2201/02B03D2203/08
Inventor 倪中海苏金水王磊李孟乐
Owner CHINA UNIV OF MINING & TECH
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