CN111215253B - Low-rank coal flotation reagent and flotation method - Google Patents
Low-rank coal flotation reagent and flotation method Download PDFInfo
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- CN111215253B CN111215253B CN202010075784.XA CN202010075784A CN111215253B CN 111215253 B CN111215253 B CN 111215253B CN 202010075784 A CN202010075784 A CN 202010075784A CN 111215253 B CN111215253 B CN 111215253B
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- 238000005188 flotation Methods 0.000 title claims abstract description 135
- 239000003245 coal Substances 0.000 title claims abstract description 123
- 239000003153 chemical reaction reagent Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 55
- 239000003814 drug Substances 0.000 claims abstract description 24
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 15
- 150000002148 esters Chemical class 0.000 claims abstract description 12
- 239000010687 lubricating oil Substances 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 12
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims abstract description 11
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims abstract description 11
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 11
- 229930195729 fatty acid Natural products 0.000 claims abstract description 11
- 239000000194 fatty acid Substances 0.000 claims abstract description 11
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 11
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 11
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 11
- 239000011780 sodium chloride Substances 0.000 claims abstract description 11
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000004088 foaming agent Substances 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- 230000033558 biomineral tissue development Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000012141 concentrate Substances 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 239000008396 flotation agent Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/08—Coal ores, fly ash or soot
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A flotation reagent and a flotation method for low-rank coal, which are suitable for recycling low-rank coal resources. The mass portion ratio is as follows: 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; adding a low-rank coal flotation reagent and water into the stirring barrel I for stirring, then adding low-rank coal into the stirring barrel II for stirring and controlling the concentration of ore pulp, and then carrying out flotation. The flotation agent has good flotation effect and saves the medicine, the dispersion performance of the agent in the ore pulp is promoted by adding the flotation agent into the ore pulp stirring barrel in advance, and the full contact and adsorption of the pre-selection agent and particles are ensured so as to exert the optimal performance of the composite flotation agent.
Description
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
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 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:
(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):
Claims (5)
1. a low-rank coal flotation reagent is characterized in that: the medicament comprises the following raw materials 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.
2. A flotation process using the low rank coal flotation reagent of claim 1, wherein: a low-rank coal flotation reagent is used 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 (1), starting the stirring barrel I (1) 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 to a stirring barrel II (3) by using a slurry pump (2), adding low-rank coal to be floated into the stirring barrel II (3), and supplementing water into the stirring barrel II (3) to maintain the concentration of the ore pulp in the barrel;
starting a stirring barrel II (3) to stir to obtain fully mixed ore pulp I (b), 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) to an ore pulp preprocessor (5) by using a slurry pump II (4), adding a foaming agent (c) into the ore pulp preprocessor (5), starting an impeller in the ore pulp preprocessor (5) to mix the mixed ore pulp I (b) with the foaming agent (c), finishing primary 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) for flotation operation;
in the flotation operation, the mixed ore pulp II (d) 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);
3. a flotation process 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. A flotation process according to claim 2, characterized in that: the concentration of the ore pulp in the stirring barrel II (3) is kept at 80 g/L.
5. A flotation process according to claim 2, characterized in that: 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 (c) is fusel, and the dosage per ton of the dry coal slime is 0.5 kg.
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CN202010075784.XA CN111215253B (en) | 2020-01-22 | 2020-01-22 | Low-rank coal flotation reagent and flotation method |
PCT/CN2020/132021 WO2021147508A1 (en) | 2020-01-22 | 2020-11-27 | Efficient flotation reagent for low-rank coal and flotation method |
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CN112916582B (en) * | 2021-01-26 | 2022-11-22 | 中国矿业大学 | Gasification fly ash decarbonization method by combined flotation of mechanical activation and compound reagent |
CN113522182A (en) * | 2021-07-20 | 2021-10-22 | 中国矿业大学 | Preparation method of used oil collecting agent for low-rank coal flotation |
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