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A Method of Selective Flocculation-Reverse Flotation for Ash Reduction of Ultrafine Subbituminous Coal

A sub-bituminous coal and selective technology, applied in the field of mineral processing, can solve the problems of deteriorating the effect of reverse flotation separation, and achieve the effect of improving the effect of reverse flotation, reducing the ash content of clean coal, and achieving good effect.

Inactive Publication Date: 2019-02-22
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the known coal reverse flotation method, ultra-fine particle coal will absorb a large amount of ammonium salt collector, which deteriorates the separation effect of reverse flotation

Method used

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  • A Method of Selective Flocculation-Reverse Flotation for Ash Reduction of Ultrafine Subbituminous Coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A certain bituminous coal ash content: 8.81%, moisture: 27.72%, weigh 20g of coal samples with a particle size range of -74μm (ie particle size less than 74μm) accounting for 56.07% and 8.5g of quartz (average particle size 10.42μm) and place them in a 0.5LXFD hanging tank In the selection machine, add distilled water until the overall volume is 0.5L, and the solid concentration is 57g / L; then add sodium hexametaphosphate 1kg / t, and stir for 3min at a speed of 1890r / min; then add inhibitor dextrin 1kg / t, and stir 3min; reduce the speed to 1000r / min, then add non-ionic polymer flocculant (referred to as PAM) 50g / t, stirring time 3min; then add foaming agent methyl isobutyl carbinol (referred to as MIBC) 10ppm, stir 1min ;Finally add collector ammonium salt, the dosage is 1kg / t, at the same time, open the air valve to start inflating, the flotation process officially starts, and the scraping time is 5min.

[0018] The results of this example are: the ash content of clean ...

Embodiment 2

[0020] Take by weighing the same manual mixing feed as in Example 1, coal sample 28g, quartz 12g, place in 0.5LXFD hanging tank flotation machine, add distilled water to 0.5L, solid concentration is 80g / L; Then add hexametaphosphoric acid Sodium 1kg / t, stir for 3min at a speed of 1890r / min; then add inhibitor dextrin 2kg / t, stir for 3min; reduce the speed to 1000r / min, then add non-ionic polymer flocculant 80g / t, stirring time 3min; then add foaming agent methyl isobutyl carbinol 10ppm, stir for 1min; finally add collector compound ammonium salt, the dosage is 0.5kg / t, open the air valve to start inflating at the same time, the flotation process officially starts, scrape foam The time is 5 minutes.

[0021] The results of this example are: clean coal ash content 21.32%, combustible body recovery rate 91.16%, compared with no addition of PAM, the ash content decreased by 3.03 percentage points, and the separation efficiency also increased from 41.13% to 47.47%. It can be seen ...

Embodiment 3

[0023] A certain bituminous coal ash content: 9.32%, moisture: 24.58%, -74μm particle size fraction accounted for 54.87%. The average particle size of a certain quartz is 11.37 μm, and the maximum particle size is 54 μm. Weigh 14g of coal sample and 6g of quartz, put it in a 0.5L XFD hanging tank flotation machine, add distilled water to 0.5L, and the solid concentration is 40g / L; Stir for 3min; then add inhibitor dextrin 1kg / t, stir for 3min; reduce the speed to 1000r / min, then add non-ionic polymer flocculant 20g / t, stir for 3min; then add foaming agent methyl isobutyl Base methanol 20ppm, stir for 1min; finally add collector compound ammonium salt, the dosage is 2kg / t, open the air valve to start inflating at the same time, the flotation process officially starts, and the scraping time is 5min.

[0024] The result of this embodiment is: the ash content of clean coal is 11.64%, and the combustible body recovery rate is 87.58%. Compared with when no PAM is added, the ash con...

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Abstract

The invention discloses a selective flocculation-reverse flotation ash content decreasing method for ultrafine-grained sub-bituminous coal. The method is a method that preselection is conducted in a conventional sub-bituminous coal reverse flotation method and comprises the steps that firstly, sodium hexametaphosphate is added, and size mixing, dispersing and stirring are conducted; secondly, dextrin is sequentially added to serve as an inhibitor, and stirring is conduced; thirdly, a non-ionic polymeric flocculant (PAM) is added, and stirring is conducted; fourthly, a foaming agent methyl isobutyl carbinol (MIBC) is added, and stirring is conducted; and fifthly, a collecting agent compound ammonium salt is added, and air inflating and bubble scraping are conducted simultaneously. According to the method, under the condition of the same collecting agent, the ash content of clean coal can be effectively decreased, consumption of the collecting agent is reduced, the reverse flotation separation efficiency of the sub-bituminous coal is improved, and the purposes of decreasing the ash content of the ultrafine-grained sub-bituminous coal and improving the quality of the ultrafine-grained sub-bituminous coal are achieved.

Description

technical field [0001] The invention relates to a reverse flotation ash reduction method for sub-bituminous coal, in particular to a selective flocculation-reverse flotation ash reduction method for superfine sub-bituminous coal, which belongs to the technical field of mineral processing. Background technique [0002] Coal is an important energy source, and low-rank coal accounts for more than 40% of the world's proven coal reserves, and my country's low-rank coal accounts for 46% of the remaining resource reserves. In recent years, coking coal resources have become increasingly scarce, and low-rank coal such as thermal coal has gradually expanded in the international trade market. Therefore, the cleanliness of low-rank coal is very important. In addition to being used as fuel, low-rank coal can also be made into some chemical products through pyrolysis, gasification, liquefaction, etc., as well as the production of adsorption materials. In view of this, the upgrading, sort...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D3/06B03D101/00B03D101/02B03D101/04B03D101/06
CPCB03D1/018B03D3/06B03D2201/002B03D2201/005B03D2201/02B03D2201/04B03D2201/06
Inventor 李永改陈建中沈丽娟
Owner CHINA UNIV OF MINING & TECH
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