CN105964410A - Preparation method of coal slime flotation collector - Google Patents

Preparation method of coal slime flotation collector Download PDF

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Publication number
CN105964410A
CN105964410A CN201610360493.9A CN201610360493A CN105964410A CN 105964410 A CN105964410 A CN 105964410A CN 201610360493 A CN201610360493 A CN 201610360493A CN 105964410 A CN105964410 A CN 105964410A
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Prior art keywords
coal
coal slime
flotation collector
preparation
flotation
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CN201610360493.9A
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CN105964410B (en
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张志强
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00Specified effects produced by the flotation agents
    • B03D2201/02Collectors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00Specified materials treated by the flotation agents; specified applications
    • B03D2203/02Ores
    • B03D2203/04Non-sulfide ores
    • B03D2203/08Coal ores, fly ash or soot

Abstract

The invention discloses a preparation method of a coal slime flotation collector. The preparation method comprises the steps that diesel oil, kerosene and clean coal particles which are from the same producing area and are to be subjected to flotation through the coal slime flotation collector are mixed, effective constituents in raw materials are made to be adsorbed on the surfaces of the clean coal particles, then desorption is conducted on the effective constituents adsorbed on the surfaces of the clean coal, and accordingly the flotation collector used for conducting flotation on coal slime from a specific producing area is obtained. According to the preparation method, the coal slime flotation collector can be prepared according to the surface physical and chemical properties of the coal slime in a targeted mode, the effect of the prepared flotation collector is good, and the preparation method is simple and easy to operate and has great industrial application value.

Description

A kind of preparation method of coal slime flotation collector
Technical field
This preparation method relating to a kind of coal slime flotation collector, specifically diesel oil or kerosene are mixed with the cleaned coal granule in the same place of production utilizing this coal slime flotation collector to carry out flotation, making the effective ingredient in raw material adsorb at cleaned coal particle surface, then desorbing is in the preparation method of a kind of coal slime flotation collector of the effective ingredient of cleaned coal surface adsorption.
Background technology
Flotation is the main method of drying slime, and it is dependent on the difference of coal and spoil surface hydrophobic, sorts in gas, solid, liquid three-phase.Coal belongs to nonpolar mineral, and its surface typically has certain hydrophobicity, but in order to improve coal slime flotation effect, coal slime flotation process is generally still to add non-polar hydrocarbon oil, such as kerosene, diesel oil, strengthens the hydrophobicity of coal particle surface as collecting agent.The chemical composition of these non-polar hydrocarbon oil collecting agents had both included the non-polar component such as aromatic hydrocarbons, alkene, alkane, also included the miscellaneous polar compounds such as part is oxygen-containing, nitrogenous, by adsorbing in coal particle surface and launching to form oil film and play collecting effect.
Both at home and abroad carry out many research to improve the activity of floating agent, it is proposed that several improve effective method of modifying of physicochemical properties of non-polar hydrocarbon oil, including:
(1) utilize high-energy ray radiation chemistry effect, change hydrocarbon structure.
(2) make electrochemically, fractional saturation non-polar hydrocarbon oil is oxidized to carboxylic polar molecule.
(3) hydrocarbon-type oil is passed through oxygen and carries out liquid phase catalytic oxidation so that it is free radical chain reactions occurs, different according to degree of oxidation, the different oxygenatedchemicals such as peroxide, alcohol, acid, ketone, ester can be generated, it is thus achieved that have concurrently and bubble and the floating agent of collecting.
Even so, in current plant-scale coal slime flotation, coal is bad with the suitability of flotation collector is always a problem needing to solve.This has the reason of two aspects: on the one hand, and for coal, owing to it is complicated organic high molecular compound, the surface nature of coal particle is widely different with coal rank, the place of production, exploitation and storage condition and the difference of time;On the other hand, for collecting agent, its collecting performance and its chemical composition are in close relations, and its composition has larger difference with the place of production, processing method, the difference of cut point, even if the same collecting agent that same factory produces, performance is the most unstable.The suitability that two factors result between collecting agent and coal jointly easily goes wrong, and flotation effect is poor.Such as, for same coal, the flotation collector that using effect is good originally, due to coal district replacing, effect becomes very poor.Tracing it to its cause, be because collecting agent in floatation process and the most all can play collecting effect, a large amount of invalid components are inoperative and slattern.
Summary of the invention
The purpose of the present invention provides the coal slime flotation collector of suitability according to the physicochemical properties of specific place of production coal slime, specific aim, and provides the preparation method of a kind of coal slime flotation collector.
For achieving the above object, the present invention takes the steps to prepare coal slime flotation collector.
A kind of preparation method of coal slime flotation collector, described preparation method follows these steps to carry out:
(1) raw coal is sorted, obtain, by crushing and screening, the cleaned coal granule that granularity is 0.1~3.0mm;Described raw coal is various deterioration coals, and and the coal slime flotation collector prepared according to the method disclosed in the present the coal of suitable flotation there is the identical place of production;Described method for separating includes gravity treatment and the physics of flotation and physico-chemical process;
(2) it is 0.2~30:1 to mix by preparing the raw material of coal slime flotation collector and cleaned coal granule according to mass ratio, stirs 0.1-5h, it is thus achieved that the solidliquid mixture of raw material and cleaned coal;The described raw material preparing coal slime flotation collector is the one in diesel oil and kerosene or its mixture;
(3) by above-mentioned solidliquid mixture centrifugation 0.2-3h, centrifugal rotational speed is 600~5000r/min, then the supernatant is taken out, it is thus achieved that bottom solid precipitation;
(4) solid precipitation that above-mentioned 3rd step is formed being added thermal distillation, keeping operation temperature is 25~300 DEG C, and operation pressure is 0.02~0.5MPa;The product that distillation obtains is collected by condensing unit, and condensation temperature is-10~20 DEG C, and the product liquid that condensation obtains is coal slime flotation collector;Solid residue after flash distillation is cycled to used in the preparation of coal slime flotation collector.
Coal slime flotation collector prepared by the above-mentioned preparation method of the present invention has such advantages as and good effect compared with the coal slime flotation collector prepared by prior art.
First, prepared flotation collector and coal have suitability." key principle " is used from molecular scale by the present invention the most original feature exactly: the coal particle classes, all of flotation is like lock, the template can prepared as collecting agent;The various components contained by conventional flotation collecting agent such as kerosene well known in the art, diesel oil are similar to the key needing screening.The preparation process of coal slime flotation collector of the present invention is similar to find the process of appropriate key into a type of lock.
Second, the surface nature of coal is the most closely related with coal rank, the place of production, recovery time and storage condition, there is the biggest diversity.Existing technological means also cannot characterize the surface texture of coal from molecular level.During traditional kerosene, diesel oil and various industrial collecting agent is selected, it is only capable of selecting roughly according to indexs such as coal rank, coal surface hydrophobics, make some component and the coal surface in the collecting agent selected cannot be adaptive, effectively can not sprawl on coal surface, the maximum utility of collecting agent can not be played, a large amount of collecting agents remain in water, thus cause the luxus consumption of medicament to waste.Prior art cannot reasonably be solved.The present invention solves this problem: by conventional flotation collecting agent contacts the flotation collector of processability adaptation with coal particle surface: composition suitable with coal surface nature in initiation material will complete molecular recognition process in coal particle surface, and absorption is in coal particle surface.This fractions is only the useful component playing coal flotation collecting effect, and this moieties is used for the flotation of coal slime, and effect is compared preferably conventional flotation collecting agent collecting effect and to be strengthened much undoubtedly.
3rd, to compare and the existing method utilizing radiation chemistry, magnetic field, electrochemistry and catalytic oxidation to prepare coal slime flotation collector, the method disclosed in the present is simpler, and cost is quite or lower.Furtherly, even if the surface molecule structure of coal can characterize clear, only specificity screening synthesis also will be abnormal expensive for the expense of specific coal collecting agent, maybe will lose industrial application value.The method disclosed in the present can reach identical effect and obvious with low cost a lot.Thus the great industrial application value of preparation method of coal slime flotation collector disclosed in this invention.
4th, the coal slime flotation collector prepared by the present invention is good due to the suitability with coal, it is applied in coal slime flotation, it is possible to reduce consumption, reduces the processing cost of tailing water, beneficially environmental conservation.Using coal flotation collecting agent prepared by this method in Gujiao City's throughput forecast coal slime flotation is tested, in the case of other operating conditions are identical, than kerosene collector fuel-economizing up to 75%, cleans ash can reduce by 30% simultaneously.
Detailed description of the invention
Below in conjunction with specific embodiment, the preparation method of a kind of coal slime flotation collector provided by the present invention is described in further detail, but the invention is not limited in this.
In the examples below, the initiation material kerosene in the present invention, diesel oil are industrial products, all can be by being either commercially available, and its source can be guaranteed.
Embodiment 1
The first step: use kerosene as foaming agent, Alumen ditch colliery, Gujiao City coal slime to be carried out conventional flotation as collecting agent, sec-octyl alcohol.Floatation equipment uses XFD-1.5L type inflation single-trough flotating machine, speed of mainshaft 1800r/min, aeration quantity 0.15m3/ h, flotation cell volume is 1.5L, and coal-water fluid concentration is 100g/L.Floatation process is as follows: add kerosene according to 200g/t coal slime in pulp, and size mixing stirring 1min;Then according to 50g/t coal slime adds sec-octyl alcohol, size mixing stirring 10s.Opening air intake valve, bubble 3min is scraped in timing, and products obtained therefrom filters, dries acquisition cleaned coal granule, standby;
Second step: take kerosene 5000g, cleaned coal granule 1200g prepared by the first step, mix in agitator, stirring slurry is used to be stirred with 1000r/min rotating speed, mixing time is 0.5h, so that the active component in kerosene can fully adsorb in coal particle surface, it is thus achieved that coal and the solidliquid mixture of kerosene.
3rd step: the agitator that will be equipped with solidliquid mixture puts into centrifuge, centrifugation 2h, and centrifugal rotational speed is 3000r/min so that solid-liquid is biphase produces layering.Supernatant pumped, collects bottom solid portion and continues to employ.
4th step: the solid portion the 3rd step collected adds heating in rustless steel distillating still, operation temperature is 150 DEG C, operation pressure is 0.05MPa, the steam product that distillation produces is collected after being condensed by condenser, condensation temperature is set in 10 DEG C, and the product liquid that condensation obtains is the collecting agent being exclusively used in Alumen ditch colliery, Gujiao City coal slime flotation;Solid residue after distillation can be cycled to used in the preparation of Alumen ditch colliery, Gujiao City coal slime flotation collector.
Embodiment 2
The first step: use kerosene as foaming agent, Gujiao City's throughput forecast coal slime to be carried out conventional flotation as collecting agent, sec-octyl alcohol.Floatation equipment uses XFD-1.5L type inflation single-trough flotating machine, speed of mainshaft 1800r/min, aeration quantity 0.15m3/ h, flotation cell volume is 1.5L, and coal-water fluid concentration is 100g/L.Floatation process is as follows: add kerosene according to 200g/t coal slime in pulp, and size mixing stirring 1min;Then according to 50g/t coal slime adds sec-octyl alcohol, size mixing stirring 10s.Opening air intake valve, bubble 3min is scraped in timing, and products obtained therefrom filters, dries acquisition cleaned coal granule, standby;
Second step: take kerosene 8000g, cleaned coal granule 1000g prepared by the first step, mix in agitator, stirring slurry is used to be stirred with 1200r/min rotating speed, mixing time is 2h, so that the active component in kerosene can fully adsorb in coal particle surface, it is thus achieved that coal and the solidliquid mixture of kerosene.
3rd step: the agitator that will be equipped with solidliquid mixture puts into centrifuge, centrifugation 1h, and centrifugal rotational speed is 1500r/min so that solid-liquid is biphase produces layering.Supernatant pumped, collects bottom solid portion and continues to employ.
4th step: the solid portion the 3rd step collected adds heating in rustless steel distillating still, operation temperature is 60 DEG C, operation pressure is 0.1MPa, the steam product that distillation produces is collected after being condensed by condenser, condensation temperature is set in 5 DEG C, and the product liquid that condensation obtains is the collecting agent being exclusively used in Gujiao City's throughput forecast coal slime flotation;Solid residue after distillation can be cycled to used in the preparation of Gujiao City's throughput forecast coal slime flotation collector.
Embodiment 3
The first step: colliery, town bulk raw coal will be converted from willow Coking Coal Group and use hammer mill to be crushed to below 3mm, and obtain, with standard screen screening, the coal particle that granularity is 0.5~2.0mm.Coal particle is added mixing tank, the coal slurry of the preparation mass concentration 25% that adds water, open feed pump, make coal slurry sort through BL600 type spiral, access cleaned coal and tail coal by splicing funnel.BL600 type spiral helicla flute external diameter 600mm, length 2800mm.Gained cleaned coal granule dry for standby;
Second step: take diesel oil 2000g, cleaned coal granule 1000g prepared by the first step, mix in agitator, stirring slurry is used to be stirred with 1500r/min rotating speed, mixing time is 3h, so that the active component in diesel oil can fully adsorb in coal particle surface, it is thus achieved that coal and the solidliquid mixture of diesel oil.
3rd step: the agitator that will be equipped with solidliquid mixture puts into centrifuge, centrifugation 0.5h, and centrifugal rotational speed is 1000r/min so that solid-liquid is biphase produces layering.Supernatant pumped, collects bottom solid portion and continues to employ.
4th step: the solid portion the 3rd step collected adds heating in rustless steel distillating still, operation temperature is 200 DEG C, operation pressure is 0.02MPa, the steam product that distillation produces is collected after being condensed by condenser, condensation temperature is set in 20 DEG C, and the product liquid that condensation obtains is and is exclusively used in the collecting agent converting colliery, town coal slime flotation from willow Coking Coal Group;Solid residue after distillation can be cycled to used in the preparation converting colliery, town coal slime flotation collector from willow Coking Coal Group.

Claims (1)

1. a preparation method for coal slime flotation collector, described preparation method follows these steps to carry out:
(1) raw coal is sorted, obtain, by crushing and screening, the cleaned coal granule that granularity is 0.1~3.0mm;Described raw coal is various deterioration coals, and and the coal slime flotation collector prepared according to the method disclosed in the present the coal of suitable flotation there is the identical place of production;Described method for separating includes gravity treatment and the physics of flotation and physico-chemical process;
(2) it is 0.2~30:1 to mix by preparing the raw material of coal slime flotation collector and cleaned coal granule according to mass ratio, stirs 0.1-5h, it is thus achieved that the solidliquid mixture of raw material and cleaned coal;The described raw material preparing coal slime flotation collector is the one in diesel oil and kerosene or its mixture;
(3) by above-mentioned solidliquid mixture centrifugation 0.2-3h, centrifugal rotational speed is 600~5000r/min, then the supernatant is taken out, it is thus achieved that bottom solid precipitation;
(4) solid precipitation that above-mentioned 3rd step is formed being added thermal distillation, keeping operation temperature is 25~300 DEG C, and operation pressure is 0.02~0.5MPa;The product that distillation obtains is collected by condensing unit, and condensation temperature is-10~20 DEG C, and the product liquid that condensation obtains is coal slime flotation collector;Solid residue after flash distillation is cycled to used in the preparation of coal slime flotation collector.
CN201610360493.9A 2016-05-28 2016-05-28 A kind of preparation method of coal slime flotation collector Expired - Fee Related CN105964410B (en)

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Cited By (2)

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CN106799310A (en) * 2017-02-06 2017-06-06 中国矿业大学 A kind of low-order coal coal slime flotation collector and its application
CN110293005A (en) * 2019-07-15 2019-10-01 中国矿业大学 A kind of liquid-solid composite collecting agent of coal slime flotation and preparation method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106799310A (en) * 2017-02-06 2017-06-06 中国矿业大学 A kind of low-order coal coal slime flotation collector and its application
CN110293005A (en) * 2019-07-15 2019-10-01 中国矿业大学 A kind of liquid-solid composite collecting agent of coal slime flotation and preparation method thereof
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