CN104399595A - High-ash difficult-to-float coal slime flotation technology - Google Patents

High-ash difficult-to-float coal slime flotation technology Download PDF

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Publication number
CN104399595A
CN104399595A CN201410607611.2A CN201410607611A CN104399595A CN 104399595 A CN104399595 A CN 104399595A CN 201410607611 A CN201410607611 A CN 201410607611A CN 104399595 A CN104399595 A CN 104399595A
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China
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coal
flotation
coal slime
slime
float
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CN201410607611.2A
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Inventor
李志红
陈智超
樊民强
朱张磊
郭丽娜
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Taiyuan University of Technology
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Taiyuan University of Technology
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Abstract

The invention discloses a high-ash difficult-to-float coal slime flotation method. The high-ash difficult-to-float coal slime flotation method comprises the following steps of selecting a part of high-ash fine slime in coal slime through a reverse flotation technology; then separating the coal slime through a direct flotation technology; finally obtaining cleaned coal in qualified quality. According to the high-ash difficult-to-float coal slime flotation method, pollution to the flotation cleaned coal from the high-ash fine slime is avoided, and accordingly the flotation effect of the coal slime is improved by the uniquely designed flotation mode and adjustment of a reagent system.

Description

A kind of floatation process of high grey difficult-to-float coal
Technical field
The present invention relates to a kind of difficult-to-float coal floatation process, be specifically related to a kind of floatation process of high grey difficult-to-float coal, belong to coal preparation technical field.
Background technology
In coal slime flotation process, thin mud causes the main cause that floatation clean coal productive rate is low, cleans ash is high.On the one hand, the thin mud of high ash easily sticks to cleaned coal surface, or is mixed in cleaned coal product by " foam is carried secretly ", causes cleans ash higher; On the other hand, thin mud has higher surface energy, and meeting Preferential adsorption medicament in floatation process, make coal grain lose flotation under medicinal strip part, meanwhile, thin mud covers the hydrophobicity that also can reduce coal grain surface, causes the productive rate of floatation clean coal on the low side.
Floating agent is the important means of regulation and control slime separation effect.But, to the grey difficult-to-float coal of height, adopt the collecting agent kerosene of conventional flotation and foaming agent sec-octyl alcohol to be difficult to obtain desirable separating effect.To this, conventional solution adds inhibitor to suppress the thin mud mineral of high ash, then carries out conventional flotation; Also many scholars are had to attempt adopting reverse flotation and bi-anti-symmetric matrix technique both at home and abroad.
Summary of the invention
The present invention aims to provide a kind of floatation process for the thin cement content difficult-to-float coal of height, by designing unique flotation mode, and regime of agent being adjusted, first sub-electing the thin mud of the high ash of part, avoid it to the pollution of floatation clean coal, thus improve the effect of coal slime flotation.
The present invention is achieved through the following technical solutions:
A method for floating for high grey difficult-to-float coal, first employing reverse floatation process selects the thin mud of the high ash of part in coal slime, and then carries out sorting by direct floatation process to coal slime, the cleaned coal of final acquisition acceptable quality; Concrete steps are as follows:
(1) gangue mineral reverse flotation: coal slime and water are added flotation cell, stirs and makes it even, and regulate pulp density to 80 ~ 100g/L; Add the inhibitor of coal and thin mud collecting agent successively, the time of sizing mixing is 1min; Open air intake valve, bubble 3min is scraped in timing; Gained froth pulp is gangue mineral, i.e. flotation tailing; In groove, product is concentrate through reverse flotation.
(2) coal slime direct flotation: stirring concentrate through reverse flotation being carried out to 8 ~ 15min, then adds pH adjusting agent, regulates slurry pH to 8 ~ 9; Add collecting agent and foaming agent, itself and particle action time are respectively 1min and 10s; Open air intake valve, bubble 3min is scraped in timing; Gained froth pulp is cleaned coal, and in groove, product is direct flotation mine tailing.
Further, in described step (1), the inhibitor of coal is starch and other modified starch aqueous solution, and consumption is 0.5 ~ 1.2kg/t coal slime.Other modified starches described comprise oxidized starch or cationic starch.
Further, in described step (1), thin mud collecting agent is fatty amine hydrochloride solution, by fatty amine and hydrochloric acid in molar ratio 1:1 prepare gained, dosing is 0.8 ~ 2.0kg/t coal slime.Described fatty amine is lauryl amine or ether amine.
Further, in described step (2), pH adjusting agent is NaOH or Na 2cO 3, consumption is 1.6 ~ 3.0kg/t coal slime.
Further, in described step (2), the collecting agent of coal is hydrocarbon-type oil (as kerosene, diesel oil), and consumption is 0.8 ~ 1.5kg/t coal slime.
Further, in described step (2), the foaming agent of coal is sec-octyl alcohol, and consumption is 50 ~ 150g/t coal slime.
Flotation have direct flotation and reverse flotation point, be direct flotation during emersion valuable mineral, emersion gangue mineral is then reverse flotation.Practice shows, to the grey difficult-to-float coal of height, the coal slime that particularly thin cement content is high, adopts the direct flotation under conventional flotation and collecting agent kerosene and the effect of foaming agent sec-octyl alcohol, be difficult to obtain desirable separating effect.In order to reduce the thin mud of high ash to the adverse effect of flotation, should carry out selecting front desliming or adopting reverse floatation process.And the advantage of reverse flotation is can directly carry out flotation by No severing mud, exploitation coal slime reverse floatation process, the flotation that can be high thin cement content difficult-to-float coal provides new approach.
The advantage of anti-, the positive two-stage flotation technique of a kind of difficult-to-float coal of the present invention is: on the basis of conventional flotation, introduce reverse flotation link, first by the thin mud of a large amount of high ash in reverse flotation removing coal slime, to alleviate the adverse effect of thin mud to coal slime flotation process choosing, and then carry out the conventional direct flotation of coal slime.Adopt present invention process scheme, good separating effect is obtained to difficult-to-float coal.
Of the present invention beneficial effect:
The present invention adopts instead, positive two-stage flotation technique, can obtain higher clean coal yield under the condition that cleans ash is qualified, for the flotation of height grey difficult-to-float coal provides a feasible technological approaches.
Accompanying drawing explanation
Fig. 1 is the flotation process figure of the high grey difficult-to-float coal of the present invention.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Float test condition and properties of samples:
Floatation equipment adopts XFD-1.5L type inflation single-trough flotating machine, speed of mainshaft 1800r/min, aeration quantity 0.15m 3/ h, flotation cell volume is 1.5L, and pulp density is 100g/L, and the granularmetric composition of test specimen is in table 1.
Table 1 slurging screen separating tests result
comparative example 1: take kerosene as collecting agent, sec-octyl alcohol carries out conventional flotation to above-mentioned coal slime sample for foaming agent.
The present embodiment is studied the coal slime flotation effect under different amounts kerosene and sec-octyl alcohol effect, and floatation process comprises the following steps:
In flotation pulp, add collecting agent kerosene, size mixing and stir 1min; Then add foaming agent sec-octyl alcohol, size mixing and stir 10s; Open air intake valve, bubble 3min is scraped in timing, and products obtained therefrom filters, dry, and weighs, chemically examines, and flotation results is in table 2.
Table 2 kerosene and sec-octyl alcohol consumption are on the impact of flotation effect
As known from Table 2, regulate the consumption of kerosene and sec-octyl alcohol, all reach more than 11% by conventional flotation gained cleans ash, do not meet quality of cleaned coal requirement, and with the increase of collecting agent, frother dosages, clean coal yield improves, and ash content also improves thereupon.
embodiment 1:
First carry out reverse flotation to above-mentioned coal slime, floatation process comprises the following steps:
(1) by lauryl amine and hydrochloric acid in molar ratio 1:1 prepare and obtain dodecylamine hydrochloride, for subsequent use;
(2) in flotation pulp, add starch solution, size mixing and stir 1min;
(3) add dodecylamine hydrochloride, size mixing and stir 1min;
(4) open air intake valve, bubble 3min is scraped in timing;
(5) froth pulp (mine tailing 1) is filtered, dries, weighs, chemically examined;
Flotation experimental results under different agents consumption is in table 3:
Table 3 starch and dodecylamine hydrochloride consumption are on the impact of flotation results
As can be seen from Table 3, by reverse flotation, clean coal yield reaches 77.09%, but ash content is also higher.On this basis, carry out conventional flotation to above-mentioned concentrate, i.e. direct flotation, floatation process is as follows:
(1) close air intake valve, strong agitation 30s is carried out to the residue ore pulp of above-mentioned floatation process;
(2) add NaOH and regulate slurry pH, then add kerosene and stir 1min, then add sec-octyl alcohol, stir 10s, open air intake valve, bubble 3min is scraped in timing, and froth pulp is concentrate (coal), and residue ore pulp is flotation tailing (mine tailing 2); Floating product is filtered, dry, weigh, chemically examine.
In reverse flotation, starch consumption is 730g/t coal slime, dodecylamine hydrochloride consumption is when being 870g/t coal slime, direct flotation is carried out to its concentrate, wherein kerosene consumption selects 900g/t coal slime, and sec-octyl alcohol consumption is 100g/t coal slime, changes the flotation experimental results of NaOH consumption in table 4:
Table 4 different N aOH consumption is on the impact of flotation effect
Compared with the result of the test of comparative example 1, adopt anti-, positive two-stage flotation technique, the acceptable quality cleaned coal that ash content is less than 11.00% can be obtained.Within the scope of certain dosing, NaOH consumption is higher, and clean coal yield is also higher, and ash content is substantially constant, and corresponding slurry pH is 8 ~ 9, and the flotation effect namely under alkali condition is better.
embodiment 2:
The floatation process of the present embodiment comprises the following steps:
(1) in flotation pulp, add starch solution, consumption is 730g/t coal slime, sizes mixing and stirs 1min; Add dodecylamine hydrochloride, consumption is 870g/t coal slime, sizes mixing and stirs 1min; Open air intake valve, bubble 3min is scraped in timing; Froth pulp (mine tailing 1) is filtered, dries, weighs, chemically examined;
(2) close air intake valve, strong agitation is carried out to the residue ore pulp of above-mentioned floatation process;
(3) add NaOH and regulate slurry pH, consumption is 2100g/t coal slime; Then add kerosene, consumption is 900g/t coal slime, stirs 1min; Add sec-octyl alcohol again, consumption is 100g/t coal slime, stirs 10s; Open air intake valve, bubble 3min is scraped in timing, and froth pulp is concentrate (coal), and residue ore pulp is flotation tailing (mine tailing 2);
(4) floating product filtered, dry, weigh, chemically examine.
The present embodiment is optimized research to the mixing time in above-mentioned steps (2), and the flotation effect under different mixing time effect is in table 5:
The different mixing time of table 5 is on the impact of flotation effect
Mixing time has remarkable impact to flotation effect, favourable to raising clean coal yield especially.When mixing time is 14min, under guarantee quality of cleaned coal prerequisite, clean coal yield can be increased to 56.83%, and suitable mixing time is 8 ~ 10min.

Claims (5)

1. a method for floating for high grey difficult-to-float coal, is characterized in that: first employing reverse floatation process selects the thin mud of the high ash of part in coal slime, and then carries out sorting by direct floatation process to coal slime, the cleaned coal of final acquisition acceptable quality; Concrete steps are as follows:
(1) gangue mineral reverse flotation: coal slime and water are added flotation cell, stirs and makes it even, and regulate pulp density to 80 ~ 100g/L; Add the inhibitor of coal and thin mud collecting agent successively, the time of sizing mixing is 1min; Open air intake valve, bubble 3min is scraped in timing; Gained froth pulp is gangue mineral, i.e. flotation tailing; In groove, product is concentrate through reverse flotation;
(2) coal slime direct flotation: stirring concentrate through reverse flotation being carried out to 8 ~ 15min, then adds pH adjusting agent, regulates slurry pH to 8 ~ 9; Add collecting agent and foaming agent, itself and particle action time are respectively 1min and 10s; Open air intake valve, bubble 3min is scraped in timing; Gained froth pulp is cleaned coal, and in groove, product is direct flotation mine tailing.
2. the method for floating of the grey difficult-to-float coal of height according to claim 1, is characterized in that: in described step (1), the inhibitor of coal is starch and other modified starch aqueous solution, and consumption is 0.5 ~ 1.2kg/t coal slime; Described thin mud collecting agent is fatty amine hydrochloride solution, by fatty amine and hydrochloric acid in molar ratio 1:1 prepare gained, dosing is 0.8 ~ 2.0kg/t coal slime.
3. the method for floating of the grey difficult-to-float coal of height according to claim 2, is characterized in that: other modified starches described are oxidized starch or cationic starch; Described fatty amine is lauryl amine or ether amine.
4. the method for floating of the grey difficult-to-float coal of height according to claim 1, is characterized in that: in described step (2), pH adjusting agent is NaOH or Na 2cO 3, consumption is 1.6 ~ 3.0kg/t coal slime.
5. the method for floating of the grey difficult-to-float coal of height according to claim 1, is characterized in that: in described step (2), the collecting agent of coal is kerosene or diesel oil, and consumption is 0.8 ~ 1.5kg/t coal slime; The foaming agent of described coal is sec-octyl alcohol, and consumption is 50 ~ 150g/t coal slime.
CN201410607611.2A 2014-11-03 2014-11-03 High-ash difficult-to-float coal slime flotation technology Pending CN104399595A (en)

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Cited By (7)

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CN105127002A (en) * 2015-07-17 2015-12-09 中国矿业大学 Floating technology for effectively reducing pollution of high ash content slime in clean coal
CN105363563A (en) * 2015-12-21 2016-03-02 太原理工大学 Reverse flotation de-ashing method for lignite
CN107442293A (en) * 2017-08-31 2017-12-08 中国矿业大学 Grey method drops in a kind of superfine granule ub-bituminous coal selective flocculation reverse flotation
CN107520057A (en) * 2017-08-22 2017-12-29 新沂市中诺新材料科技有限公司 A kind of novel cationic coal slime flotation collector
CN108246512A (en) * 2018-01-17 2018-07-06 中国矿业大学 A kind of method of plasma fortified low order coal slime reverse flotation deliming
CN110193421A (en) * 2019-06-13 2019-09-03 华北理工大学 A kind of coarse slime ore-dressing technique of heavy floating combined sorting
CN111408481A (en) * 2020-04-17 2020-07-14 神华神东煤炭集团有限责任公司 Coal slime plasma flotation deashing and desulfurization method

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127002A (en) * 2015-07-17 2015-12-09 中国矿业大学 Floating technology for effectively reducing pollution of high ash content slime in clean coal
CN105363563A (en) * 2015-12-21 2016-03-02 太原理工大学 Reverse flotation de-ashing method for lignite
CN107520057A (en) * 2017-08-22 2017-12-29 新沂市中诺新材料科技有限公司 A kind of novel cationic coal slime flotation collector
CN107442293A (en) * 2017-08-31 2017-12-08 中国矿业大学 Grey method drops in a kind of superfine granule ub-bituminous coal selective flocculation reverse flotation
CN108246512A (en) * 2018-01-17 2018-07-06 中国矿业大学 A kind of method of plasma fortified low order coal slime reverse flotation deliming
CN110193421A (en) * 2019-06-13 2019-09-03 华北理工大学 A kind of coarse slime ore-dressing technique of heavy floating combined sorting
CN111408481A (en) * 2020-04-17 2020-07-14 神华神东煤炭集团有限责任公司 Coal slime plasma flotation deashing and desulfurization method

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