CN111215253B

CN111215253B - A kind of low-rank coal flotation agent and flotation method

Info

Publication number: CN111215253B
Application number: CN202010075784.XA
Authority: CN
Inventors: 夏阳超; 桂夏辉; 邢耀文; 张锐; 夏灵勇; 魏立勇; 刘太顺; 王�锋; 车涛; 孟凡彩
Original assignee: KAILUAN (GROUP) CO Ltd; China University of Mining and Technology CUMT; Yanzhou Coal Mining Co Ltd
Current assignee: KAILUAN (GROUP) CO Ltd; China University of Mining and Technology CUMT; Yanzhou Coal Mining Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2021-04-20
Anticipated expiration: 2040-01-22
Also published as: CN111215253A; WO2021147508A1

Abstract

A low-rank coal flotation agent and a flotation method are suitable for recycling low-rank coal resources. The ratio of parts by mass is: waste lubricating oil: 40-60 parts, short-chain ester: 5-25 parts, 80:10 parts of spanner, fatty acid polyoxyethylene ether: 10 parts, CuSO ₄ : 5 parts, NaCl: 6 parts , flocculant: 4 parts; add low-rank coal flotation agent and water to mixing tank I for stirring, then add low-rank coal to mixing tank II for stirring and control the slurry concentration, and then carry out flotation. The flotation effect is good and the medicine is saved. By adding the flotation reagent to the slurry mixing tank in advance, the dispersion performance of the reagent in the pulp is promoted, and the full contact and adsorption of the reagent and the particles before the separation is guaranteed, so as to play the role of the composite flotation reagent. best performance.

Description

Low-rank coal flotation reagent and flotation method

Technical Field

The invention relates to a high-efficiency low-rank coal flotation reagent and a flotation method, in particular to a high-efficiency low-rank coal flotation reagent and a flotation method which are suitable for coal enterprises and aim at recycling low-rank coal resources.

Background

The reserves of low-rank coal in China, including brown coal, long flame coal, non-caking coal and weakly caking coal, are very rich and account for about 40 percent of the whole coal resources. With the consumption and shortage of coal resources such as high-quality coking coal and the like, the exploitation and utilization of low-rank coal has great significance for ensuring the energy supply mainly based on coal in China, realizing the high-efficiency utilization of low-quality coal resources and reducing the environmental pollution of coal systems. The improvement of the mining mechanization degree and the development of dense-medium coal separation enable coal to present the characteristic of fine particle size, and flotation is one of the most economic and effective technologies for separating fine coal slime. However, the low-rank coal generally has high water content, low calorific value and strong particle surface hydrophilicity, and the dosage of reagents (collecting agents and foaming agents) required by each ton of dry coal slime flotation is between 10kg and 60 kg. Meanwhile, the complex mineral laying structure greatly reduces the flotation efficiency of the low-rank coal. The main reasons for causing the higher consumption of the flotation reagent of the low-order coal slime are as follows: (1) because the low-rank coal has low deterioration degree, the particle surface contains a large number of oxygen-containing functional groups, and the oxygen-containing functional groups on the surface are easy to form hydrogen bonds with water molecules, so that the hydrocarbon oil collecting agent is difficult to effectively spread on the particle surface; (2) the surface of the low-rank coal is usually porous and loose, and the developed pore structure can enable the flotation reagent to be directly adsorbed by the low-rank coal, so that the effect of the flotation reagent is reduced; (3) the traditional collector for low-rank coal flotation is generally hydrocarbon oil such as diesel oil or kerosene, the hydrocarbon oil has the characteristics of high viscosity, difficulty in dispersion in water and the like, in one-time flotation, the flotation process of low-rank coal can be strengthened to a certain extent by adding excessive collector, but the dispersion of the collector is not facilitated due to higher dosage. The problems of poor flotation effect of low-rank coal, high consumption of chemicals and the like are one of the difficult problems which plague the production of coal preparation plants.

Aiming at strengthening the flotation process of low-rank coal, domestic scholars propose a plurality of technical methods. The method mainly focuses on particle surface pretreatment, such as ultrasonic, microwave and heating pretreatment on the surface of low-rank coal to improve the proportion of hydrophobic groups on the surface of particles, grinding pretreatment is carried out on the low-rank coal to strip an oxide layer, and a surfactant is added or a polar collector is adopted to improve hydrophobicity in the pulp mixing process; also, oil collectors have been prepared by researchers to produce oil bubbles to improve their flotation performance. Although the methods have certain experimental effects, the problems of difficult floatation and high drug consumption of the low-rank coal are not fundamentally solved, and the required experimental requirements are difficult to meet in the actual production.

Disclosure of Invention

The technical problem is as follows: aiming at the defects of the technology, the efficient low-rank coal flotation reagent and the flotation method which have the advantages of high flotation efficiency, flotation reagent consumption saving and reagent dispersibility improvement in ore pulp, so that the best performance of the reagent is ensured to be exerted, and green and efficient utilization of low-rank coal resources is realized are provided.

The technical content is as follows: the invention relates to a low-rank coal flotation reagent which comprises the following components in parts by mass: waste lubricating oil: 40-60 parts of short-chain ester: 5-25 parts, span 80: 10 parts of fatty acid polyoxyethylene ether: 10 parts of CuSO₄: 5 parts, NaCl: 6 parts, flocculant: 4 parts of a mixture; the components are not poured into the same container in sequence, and are stirred and mixed uniformly.

A flotation method of a low-rank coal flotation reagent uses the low-rank coal flotation reagent as a flotation reagent,

the method comprises the following specific steps:

adding a low-rank coal flotation reagent and water into a stirring barrel I, starting the stirring barrel I for stirring, and mixing the low-rank coal flotation reagent under the action of impeller shearing and water to form a stirred composite reagent;

conveying the stirred composite reagent into a stirring barrel II by using a slurry pump, adding the low-rank coal to be floated into a second section of flotation stirring barrel, and supplementing water into the stirring barrel II to keep the concentration of the ore pulp in the barrel;

starting a stirring barrel II to stir to obtain fully mixed ore pulp I, so that the low-rank coal flotation reagent is effectively diffused, and the diffused low-rank coal flotation reagent is efficiently contacted with coal and mineral particles in the low-rank coal, so that the low-rank coal flotation reagent is effectively adsorbed and spread on the surfaces of the coal and mineral particles;

conveying the mixed ore pulp I into an ore pulp preprocessor by using a slurry pump II, simultaneously adding a corresponding foaming agent into the ore pulp preprocessor, starting an impeller in the ore pulp preprocessor to mix the mixed ore pulp I with the foaming agent, finishing primary mineralization under the action of a low-rank coal flotation reagent and the foaming agent to obtain mixed ore pulp II, and feeding the mixed ore pulp II into a flotation column along a pipeline through a slurry pump III to perform flotation operation;

in the flotation operation, the mixed ore pulp II is completely mineralized in the flotation column, the completely mineralized ore pulp is subjected to flotation, flotation concentrate is discharged through an overflow weir at the upper part of the flotation column in a pipe mode, and tailings after flotation are discharged through a bottom flow port of the flotation column;

and repeating the process until the flotation process is completely finished.

The stirring time of the stirring barrel I is 5-10 minutes, and the stirring time of the stirring barrel II is 2-5 minutes.

The concentration of the ore pulp in the stirring barrel II is kept at 80 g/L.

In actual use, the low-rank coal is dry coal slime, the dosage of a low-rank coal flotation reagent per ton of the dry coal slime is 1.8kg, the foaming agent is fusel, and the dosage of the foaming agent per ton of the dry coal slime is 0.5 kg.

Has the advantages that:

the low-rank coal flotation reagent disclosed by the invention can be used for compounding different types of reagents, so that the synergistic effect of the various types of reagents on the surface of the low-rank coal is fully exerted, the flotation effect is improved, the yield of the low-rank coal flotation clean coal is increased, and the consumption of the low-rank coal flotation reagent is greatly reduced. The waste lubricating oil and the short-chain ester can be effectively adsorbed on the surface of the low-rank coal, and the hydrophobicity of the surface of low-rank coal particles is enhanced. Span 80 and fatty acid polyoxyethylene ether promote hydrocarbon oil on the basis of enhancing surface hydrophobicity of low-order coal particlesThe dispersion in the ore pulp also can bridge the adsorption of the waste lubricating oil and the short-chain ester on the surface of the low-rank coal to a certain extent. CuSO₄The coordination adsorption of polar components in the medicament and oxygen-containing sites on the surfaces of low-rank coal particles can be promoted, and double electric layers among particles and bubbles in a solution can be compressed by NaCl, so that the electrostatic repulsion effect among particles and bubbles is reduced. The flocculant can enhance the dispersion of the agent and simultaneously improve the selectivity of the flotation agent, thereby realizing the selective flocculation of carbon and ash in the low-rank coal;

according to the flotation method, the flotation reagent and the low-rank coal to be selected are subjected to pre-slurry mixing treatment, so that the flotation reagent is fully contacted with particles before being selected, hydrogen bond adsorption of water molecules is avoided, the action efficiency of the flotation reagent is greatly improved, and the flotation method has great practical significance in high-efficiency flotation of the low-rank coal;

the efficient composite agent is not only suitable for the flotation upgrading process of low-rank coal, but also suitable for oxidized coal or other difficult-to-float coal; the new medicament adding process is also suitable for the use of oil medicaments in other mineral flotation.

Drawings

FIG. 1 is a schematic view of the configuration of the sorting apparatus of the present invention.

In the figure: 1-stirring barrel I, 2-slurry pump I, 3-stirring barrel II, 4-slurry pump II, 5-slurry preprocessor, 6-slurry pump, 7-flotation column, a-stirred composite agent, b-mixed slurry I, c-foaming agent, d-mixed slurry, e-flotation concentrate, f-tailings, g-washing water

Detailed Description

The invention will be further described in the following with reference to the accompanying drawings:

as shown in figure 1, the low-rank coal flotation reagent is characterized by comprising the following components in parts by mass: waste lubricating oil: 40-60 parts of short-chain ester: 5-25 parts, span 80: 10 parts of fatty acid polyoxyethylene ether: 10 parts of CuSO₄: 5 parts, NaCl: 6 parts, flocculant: 4 parts of a mixture; the components are not poured into the same container in sequence, and are stirred and mixed uniformly.

A flotation method uses a low-rank coal flotation reagent as a flotation reagent, and comprises the following specific steps:

adding a low-rank coal flotation reagent and water into a stirring barrel I1, wherein the stirring time of the stirring barrel I1 is 5-10 minutes, the stirring time of a stirring barrel II 3 is 2-5 minutes, and starting the stirring barrel I1 to stir so that the low-rank coal flotation reagent is mixed under the action of impeller shearing and water to form a stirred composite reagent;

conveying the stirred composite reagent into a stirring barrel II 3 by using a slurry pump I2, adding low-rank coal to be floated into a second-stage flotation stirring barrel 3, and supplementing water into the stirring barrel II 3 to keep the concentration of ore pulp in the barrel at 80 g/L;

starting a stirring barrel II 3 for stirring to obtain fully mixed ore pulp Ib, so that the low-rank coal flotation reagent is effectively diffused, and the diffused low-rank coal flotation reagent is efficiently contacted with coal and mineral particles in the low-rank coal, so that the low-rank coal flotation reagent is effectively adsorbed and spread on the surfaces of the coal and mineral particles;

conveying the mixed ore pulp I b into an ore pulp preprocessor 5 by using a slurry pump II 4, simultaneously adding a corresponding foaming agent c into the ore pulp preprocessor 5, wherein the foaming agent c is fusel, starting an impeller in the ore pulp preprocessor 5 to mix the mixed ore pulp I b with the foaming agent c, finishing preliminary mineralization under the action of a low-rank coal flotation reagent and the foaming agent c to obtain mixed ore pulp II d, and feeding the mixed ore pulp II d into a flotation column 7 along a pipeline through a slurry pump III 6 to perform flotation operation;

in the flotation operation, the mixed ore pulp IId is completely mineralized in the flotation column 7, the completely mineralized ore pulp is subjected to flotation, flotation concentrate e is discharged through an overflow weir at the upper part of the flotation column 7 in a pipe mode, and tailings f after flotation are discharged through a bottom flow port of the flotation column 7; after each flotation the interior of the flotation column 7 is cleaned with washing water g.

The medium-low-rank coal is dry coal slime, the dosage of a low-rank coal flotation reagent per ton of the dry coal slime is 1.8kg, and the dosage of a foaming agent c is 0.5 kg.

Example 1

A flotation process using a low-rank coal flotation reagent specifically comprises the following steps:

firstly, adding the composite medicament into a stirring barrel I1 according to corresponding mass parts, starting an impeller of the stirring barrel to stir the composite medicament for 5-10 minutes, and fully mixing the medicament under the action of impeller shearing and fluid.

Secondly, compound medicament stirring back is carried to agitator II 3 through the pipeline by sediment stuff pump I2 in, will treat the low order coal of flotation simultaneously and add agitator II 3, adds the make-up water and makes the concentration of whole ore pulp keep at 80 g/L.

Further, the compound medicament and the low-rank coal are fully mixed in the stirring barrel II for 2-4 minutes, the compound medicament is effectively dispersed into the solution, meanwhile, the medicament is in efficient contact with the particles, and the medicament is adsorbed and spread on the surfaces of the particles.

Further, after the medicament and the low-rank coal are completely mixed, the ore pulp b is conveyed to an ore pulp preprocessor 5 through a slurry pump II 4, meanwhile, a corresponding foaming agent c is added into the ore pulp preprocessor, the mixed ore pulp in the ore pulp preprocessor is circulated through rotation of an impeller in the ore pulp preprocessor, preliminary mineralization is completed under the conditions of a collecting agent and the foaming agent, and the mixed ore pulp d after the preliminary mineralization is completed is fed into a flotation column 7 through a slurry pump 6 along a pipeline to be subjected to flotation operation.

Further, the flotation concentrate e in the fully mineralized pulp is discharged from an overflow weir at the upper part of the flotation column 7 through a pipeline, and the tailings f in the fully mineralized pulp sink in the flotation column 7 and are discharged from a bottom flow port through a pipeline.

And repeating the process until the flotation process is completely finished.

Specifically, the flotation reagent comprises the following substances in parts by mass:

(I) waste lubricating oil: 40 parts, short-chain ester: 25 parts, span 80: 10 parts of fatty acid polyoxyethylene ether: 10 parts of CuSO₄: 5 parts, NaCl: 6 parts, flocculant: 4 parts.

(II) waste lubricating oil: 60 parts, short-chain ester: 5 parts, span 80: 10 parts of fatty acid polyoxyethylene ether: 10 parts of CuSO₄: 5 parts, NaCl: 6 parts, flocculant: 4 parts.

(III) waste lubricating oil: 50 parts, short-chain ester: 15 parts, span 80: 10 parts of fatty acid polyoxyethylene ether: 10 parts of CuSO₄: 5 parts, NaCl: 6 parts, flocculant: 4 portions of

The flotation test results corresponding to the three proportioning data (the used collecting agent, namely the flotation agent, is 1.8kg/t, the foaming agent is fusel, is 0.5kg/t, and the low-rank coal adopts fresh coal slime water which is not flocculated in a certain coal preparation plant of Shendong group):

example 2

firstly, adding the composite medicament into a stirring barrel I1 according to corresponding mass parts, starting an impeller of the stirring barrel to stir the composite medicament for 3-5 minutes, and fully mixing the medicament under the action of impeller shearing and fluid. Secondly, compound medicament stirring back, pass through the pipeline by sediment stuff pump I2 and transport to another agitator II in, will wait that the low order coal of flotation adds agitator II 3 simultaneously, adds the make-up water and makes the concentration of whole ore pulp keep at 80 g/L. And (3) fully mixing the low-rank coal with the composite medicament in the stirring barrel II for 4-6 minutes, effectively dispersing the composite medicament into the solution, and simultaneously enabling the medicament to be in high-efficiency contact with the particles, so that the medicament is adsorbed and spread on the surfaces of the particles. Further, after the medicament and the low-rank coal are completely mixed, the ore pulp b is conveyed to an ore pulp preprocessor 5 through a slurry pump II 4, meanwhile, a corresponding foaming agent c is added into the ore pulp preprocessor, the mixed ore pulp in the ore pulp preprocessor is circulated through rotation of an impeller in the ore pulp preprocessor, preliminary mineralization is completed under participation of a collecting agent and the foaming agent, and the mixed ore pulp d after the preliminary mineralization is completed is fed into a flotation column 7 through a slurry pump 6 along a pipeline to be subjected to flotation operation. And the flotation concentrate e in the completely mineralized ore pulp is discharged from an overflow weir at the upper part of the flotation column 7 through a pipeline, and the tailings f in the completely mineralized ore pulp sink in the flotation column 7 and are discharged from a bottom flow port through a pipeline.

And repeating the process until the flotation process is completely finished.

The flotation reagent comprises the following substances in parts by mass:

Claims

1. a low-rank coal flotation agent, is characterized in that: the composition of pharmaceutical raw materials is counted in parts by mass: waste lubricating oil: 40-60 parts, short-chain esters: 5-25 parts, 80:10 parts of spartan, fatty acid Polyoxyethylene ether: 10 parts, CuSO ₄ : 5 parts, NaCl: 6 parts, flocculant: 4 parts; the above components are poured into the same container in no particular order, stirred and mixed evenly.

2. A flotation method using the low-rank coal flotation agent of claim 1, characterized in that: using the low-rank coal flotation agent as the flotation agent,

The specific steps are:

Add the low-rank coal flotation agent and water into the mixing tank I (1), start the mixing tank I (1) for stirring, so that the low-rank coal flotation agent is mixed under the action of impeller shearing and water to form a compound after stirring. medicine;

Use the slurry pump (2) to transport the mixed chemical agent into the mixing tank II (3), and at the same time, add the low-rank coal to be flotated into the mixing tank II (3), and send it to the mixing tank II (3) Supplementary water to maintain the concentration of the pulp in the barrel;

Start the mixing tank II (3) to stir to obtain a fully mixed slurry I (b), so that the low-rank coal flotation agent can be effectively diffused, and the diffused low-rank coal flotation agent can be mixed with the coal and minerals in the low-rank coal. The high-efficiency contact of particles makes the low-rank coal flotation agent adsorb and spread effectively on the surface of coal and mineral particles;

Use the slurry pump II (4) to transport the mixed pulp I (b) to the pulp pretreatment device (5), add the foaming agent (c) to the pulp pretreatment device (5) at the same time, and start the pulp pretreatment device (5). The impeller in 5) mixes the mixed pulp I (b) with the foaming agent (c), and completes the preliminary mineralization under the action of the low-rank coal flotation agent and the foaming agent (c) to obtain the mixed pulp II (d). The mixed slurry II (d) is fed into the flotation column (7) along the pipeline through the slurry pump III (6) for flotation operation;

During the flotation operation, the mixed pulp II (d) is completely mineralized in the flotation column (7). e), discharge the tailings (f) after flotation through the underflow port of the flotation column (7);

3. The flotation method according to claim 2, characterized in that: the stirring time of the stirring barrel I (1) is 5-10 minutes, and the stirring time of the stirring barrel II (3) is 2-5 minutes.

4. The flotation method according to claim 2, characterized in that: the concentration of the pulp in the stirring barrel II (3) is maintained at 80 g/L.

5. flotation method according to claim 2, is characterized in that: described low-rank coal is dry slime, and the dosage of low-rank coal flotation agent per ton of dry slime is 1.8kg, and the foaming agent (c) For fusel, the dosage per ton of dry slime is 0.5kg.