Reverse flotation de-ashing method for lignite

A technology of reverse flotation and lignite, which is applied in the field of flotation to remove ash in lignite and reverse flotation deashing of lignite, which can solve the problems of large amount of collector, large amount of inhibitor, and high ash content of clean coal, so as to reduce flotation Clean coal ash content, environmental protection selective adsorption, improve the effect of poor surface electrical properties

Inactive Publication Date: 2016-03-02
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a method for reverse flotation deashing of lignite, which solves the problem of large amount of collector, poor selecti

Method used

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  • Reverse flotation de-ashing method for lignite

Examples

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Embodiment 1

[0027] A lignite with ash content of 14.26% and moisture content of 22.20% weighed 100g of a coal sample that was ground to -0.074mm and accounted for 36.4% and placed it in a 1LXFD hanging tank flotation machine, added distilled water to 1L, and then added Paenibacillus polymyxa 3×10 6 cells / cm 3 1. Silicate bacterial metabolic protein 15g / t, stirring at 1750r / min for 3min, adding collector dodecylamine 200g / t and stirring for 5min, scraping flotation for 5min; then adding inhibitor dextrin 100g / t, silicic acid Halobacteria metabolizes polysaccharides at 50g / t. After stirring for 5 minutes, add the collector dodecylamine in an amount of 50g / t. After stirring for 3 minutes, flotation and scrape for 5 minutes.

[0028] The above silicate bacterial metabolic protein was obtained by adding analytically pure ammonium sulfate to the supernatant obtained by centrifuging the silicate bacterial culture solution at a speed of 6000r / min to saturation, vibrating at a constant temperature...

Embodiment 2

[0030] Example 2: A lignite with ash content of 42.96%, moisture content of 28.84%, weighed 100g of a coal sample that was ground to -0.074mm and accounted for 42.7% and placed it in a 1LXFD hanging tank flotation machine, added distilled water to 1L, and then added yeast 9× 10 6 cells / cm 3 , Silicate bacterial metabolic protein 25g / t, stirring at 1750r / min for 3min, adding collector ether amine 800g / t and stirring for 5min, terpineol oil 20g / t, stirring for 3min, flotation scraping and foaming for 5min; then adding inhibitor 500g / t dextrin, 60g / t polysaccharide metabolized by silicate bacteria, 100g / t collector ether amine was added after stirring for 5 minutes, flotation and scraping for 5 minutes after stirring for 3 minutes.

[0031] The results of this embodiment are: the yield of flotation clean coal is 34.5%, the ash content is 15.37%, and the recovery rate of lignite is 65.54%. While conventional flotation clean coal has the same ash content, the recovery rate is onl...

Embodiment 3

[0033] A lignite with ash content of 15.19% and moisture content of 19.90% weighed 100g of a coal sample that was ground to -0.074mm and accounted for 32.5% and placed it in a 1LXFD hanging tank flotation machine, added distilled water to 1L, and then added yeast 2×10 6 cells / cm 3 1. Silicate bacterial metabolic protein 10g / t, stirring at 1750r / min for 3min, adding collector ether amine 800g / t and stirring for 5min, methyl isobutyl carbinol 30g / t, stirring for 3min, flotation scraping for 5min; Then add inhibitor dextrin 500g / t, silicate bacterial metabolic polysaccharide 40g / t, stir for 5 minutes, add collector dodecylamine dosage 50g / t, stir for 3 minutes, then flotation and scrape for 5 minutes.

[0034] The results of this embodiment are: the yield of flotation clean coal is 72.5%, the ash content is 8.11%, and the recovery rate of lignite is 65.29%.

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Abstract

The invention discloses a reverse flotation de-ashing method for lignite, and belongs to the field of microorganism application technologies and mineral processing technologies. The method includes the steps that 1, lignite origin paenibacillus polymyxa or saccharomycetes and silicate bacterium metabolism protein are added into ore pulp, then inhibitor dextrin and silicate bacterium metabolism polysaccharose are added, and afterwards, an amine collector and a foaming agent are added to be stirred for primary flotation; 2, the inhibitor dextrin and the silicate bacterium metabolism polysaccharose are added into the ore pulp after flotation again, and then the amine collector and the foaming agent are added again to be stirred for secondary flotation, so that the product in a groove is final clean coal. By the adoption of the method, conventional flotation reagents and microorganism reagents are combined for use, the separation effect of the lignite is improved, adsorption of the collector together with fine grain clay minerals and quartz is improved, floatability of the clay minerals and the quartz is also improved, and the using quantity of conventional inhibitors is reduced by inhibiting the lignite through microorganism metabolites; the obtained reverse flotation clean coal can be better used for preparing water coal slurry.

Description

technical field [0001] The invention relates to a method for reverse flotation deashing of lignite, in particular to a method for removing ash in lignite by reverse flotation through synergistic action of microbial agents and traditional flotation agents, and belongs to the technical fields of microbial application technology and mineral processing. Background technique [0002] Lignite is one of the important fossil energy sources. my country's proven lignite reserves are about 130 billion tons, accounting for about 13% of the country's proven coal reserves. With the increasing demand for energy from economic development and the improvement of the country's awareness of coking coal resource protection, the proportion of lignite in my country's coal consumption has increased year by year, and has become the main body of thermal coal structure. Lignite has high chemical activity and strong reactivity, especially the special chemical properties of low-ash lignite are more cond...

Claims

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Application Information

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IPC IPC(8): B03D1/01B03D1/001B03D101/02B03D101/04B03D101/06B03D103/08
CPCB03D1/001B03D1/01B03D2201/02B03D2201/04B03D2201/06B03D2203/08
Inventor 杨志超张素红刘生玉郭建英
Owner TAIYUAN UNIV OF TECH
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