CN113492061A - Preparation method of hydrophobic agglomerated coal particles - Google Patents
Preparation method of hydrophobic agglomerated coal particles Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title description 5
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- 238000000034 method Methods 0.000 claims abstract description 39
- 238000000227 grinding Methods 0.000 claims abstract description 26
- 238000005054 agglomeration Methods 0.000 claims abstract description 21
- 230000002776 aggregation Effects 0.000 claims abstract description 21
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- 239000011707 mineral Substances 0.000 claims abstract description 17
- 238000010494 dissociation reaction Methods 0.000 claims abstract description 14
- 230000005593 dissociations Effects 0.000 claims abstract description 14
- 239000012141 concentrate Substances 0.000 claims description 38
- 239000003350 kerosene Substances 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000008394 flocculating agent Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 7
- 238000002441 X-ray diffraction Methods 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 5
- 239000004088 foaming agent Substances 0.000 claims description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 abstract description 5
- 239000000178 monomer Substances 0.000 abstract description 2
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- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 3
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
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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
-
- 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
- B03D1/004—Organic compounds
- B03D1/008—Organic compounds containing oxygen
-
- 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/002—Coagulants and Flocculants
-
- 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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- Manufacture And Refinement Of Metals (AREA)
Abstract
A method for hydrophobic agglomeration into coal particles, the coal particles are floated to prepare ultra-pure coal, fine grinding is carried out on flotation clean coal to obtain fine particle coal slime, and full monomer dissociation of mineral particles is realized; then carrying out selective hydrophobic agglomeration on the fine coal particles; and finally, separating the hydrophobic agglomerated coal particles from the ore by using a flotation machine to obtain the ultra-pure coal, wherein the ash content of the coal is lower than 1%.
Description
Technical Field
The invention relates to a preparation method of ultra-pure coal, in particular to a method for preparing the ultra-pure coal by hydrophobic agglomeration.
Background
With the diminishing reserves of fossil fuels and the adverse environmental impact of their use, more and more people are aware of the necessity to develop clean energy. Lithium ion batteries are the most ideal rechargeable secondary batteries for cyclic use at present, and have the characteristics of high energy, long service life, low energy consumption and the like, so the lithium ion batteries are widely applied to the fields of consumer electronics, electric transportation, aerospace and the like. Graphite electrodes are commonly used as negative electrode materials for commercial lithium batteries because of their excellent conductivity, structural stability and cycling properties. At present, the graphite electrode is mainly prepared by graphitizing petroleum coke serving as a raw material, and the graphite electrode prepared by using coal with relatively low price as the raw material can effectively reduce the production cost of the graphite electrode and realize high-valued utilization of the coal. However, the process has high requirement on the purity of coal, and the ash content of the graphitized coal raw material is required to be less than 1%.
The treatment processes for raw coal generally include chemical processes and physical processes. The chemical method mainly dissolves the inorganic mineral components embedded in the coal by strong acid or strong base, and is the simplest method for removing the inorganic mineral in the coal, such as hydrofluoric acid method, conventional acid-base method, molten base leaching method and the like, i.e. the inorganic mineral embedded in the coal by micro-fine particles is dissolved by the strong acid or strong base.
The physical method for preparing the ultra-pure coal is characterized in that the ultra-fine grinding is carried out on the coal, so that carbonaceous organic rock and minerals in the coal are fully dissociated, and the ultra-pure coal is separated by adopting a micro-fine particle mineral separation technology according to the surface property difference of ultra-pure coal particles with higher proportion of carbonaceous organic matter and tailing micro-fine particles with higher proportion of mineral matter. The method has simple flow, no toxic and corrosive medicine is used in the preparation process, and the method hardly pollutes the environment and has been valued by related industries. So far, the common physical methods include an oil agglomeration method, a selective flocculation method, a triboelectric separation method, and the like.
Selective flocculation is an effective method for sorting fine-grained minerals, mainly by using the surface property difference between different components in coal slurry to sort, adding a flocculating agent into the ore slurry, and flocculating useful particles into clusters through the bridging action of the flocculating agent. However, ultra-pure coal having an ash content of less than 1% has not been separated by this method.
Disclosure of Invention
The invention aims to provide a method for hydrophobic agglomeration coal particles, which is used for preparing ultra-pure coal by agglomeration coal particles, selectively purifying the agglomeration of the ultra-pure coal by controlling conditions such as ore grinding dissociation, selecting proper flocculating agent and the like, thereby effectively separating the ultra-pure coal from gangue and improving the purity of the coal.
The process for hydrophobic agglomeration of coal particles is characterized in that proper flotation clean coal is finely ground to obtain fine-particle coal slime, so that sufficient monomer dissociation of mineral particles is realized; then carrying out selective hydrophobic agglomeration on the fine coal particles to obtain the coal particles with larger granularity.
And separating the coal particles from the ore by floatation of the agglomerated coal particles to obtain the ultra-pure coal. I.e. the ash content of the coal is less than 1%.
Drawings
FIG. 1 is an XRD spectrum of the flotation clean coal of example 1
FIG. 2 is a particle size distribution diagram of flotation cleaned coal of example 1
FIG. 3 is an XRD pattern of the flotation cleaned coal of example 2
FIG. 4 is a particle size distribution diagram of flotation cleaned coal of example 2
FIG. 5 is a particle size distribution diagram after grinding of example 2
Detailed Description
The method of hydrophobic agglomeration of coal particles according to the present invention is described in further detail below. And do not limit the scope of the present application, which is defined by the claims. Certain disclosed specific details provide a thorough understanding of various disclosed embodiments. One skilled in the relevant art will recognize, however, that embodiments may be practiced without one or more of the specific details, with other materials, etc.
Unless the context requires otherwise, in the description and claims, the terms "comprise," comprises, "and" comprising "are to be construed in an open-ended, inclusive sense, i.e., as" including, but not limited to.
Reference in the specification to "an embodiment," "another embodiment," or "certain embodiments," etc., means that a particular described feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, "an embodiment," "another embodiment," or "certain embodiments" do not necessarily all refer to the same embodiments. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Each feature disclosed in this specification may be replaced by an alternative feature serving the same, equivalent, or similar purpose. Thus, unless expressly stated otherwise, the features disclosed are merely generic examples of equivalent or similar features.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers. All percentages, ratios, proportions, or parts are by weight unless otherwise specified.
To prepare ultra-pure coal, agglomerated coal particles are first prepared.
A method of making hydrophobic agglomerated coal particles, comprising:
(1) grinding the flotation concentrate, wherein the particle size distribution of the flotation concentrate after grinding and dissociation is as follows: d10＝3μm±2μm；
(2) Dispersing the coal sample subjected to ore grinding dissociation and a flocculating agent in water to obtain an agglomerated coal sample, wherein the flocculating agent comprises emulsified kerosene, and the agglomerated coal sample has the following particle size distribution: d10＝35μm±2μm。
The emulsified kerosene comprises kerosene and water. Preferably, the mass ratio of water to kerosene in the emulsified kerosene is 3.5:1 to 5: 1.
In the step (1), the preparation method of the flotation concentrate comprises the following steps: dispersing the flotation clean coal into water, and adding a flotation agent to carry out flotation and foam scraping.
The time for scraping bubbles by flotation is controlled to be 1.5 min-3 min.
After the flotation clean coal is dispersed in water, the concentration of the ore pulp is 9.5-11 wt%.
The flotation concentrate can be prepared from any flotation concentrate disclosed in the prior art. As long as the grey level of the coal sample of the flotation concentrate is below 6.0%.
The flotation clean coal comprises flotation clean coal 1 and flotation clean coal 2.
In certain embodiments, the X-ray diffraction pattern of flotation clean coal 1 from which the flotation concentrate is made shows diffraction peaks at 8.75 ° ± 0.1 °, 17.58 ° ± 0.1 °, 19.76 ° ± 0.1 °, 20.86 ° ± 0.1 °, 26.64 ° ± 0.1 °, 36.54 ° ± 0.1 ° and 50.14 ° ± 0.1 °.
As can be seen from the XRD spectrum of the flotation clean coal 1, the diffraction peaks appearing at 20.86 °, 26.64 °, 36.54 ° and 50.14 ° correspond to the (100), (101), (110) and (112) crystal planes of quartz, respectively. And diffraction peaks at 8.75 °, 17.58 ° and 19.76 ° correspond to the (001), (002) and (020) crystal planes of muscovite mica, respectively. Therefore, the main gangue mineral compositions in the flotation clean coal 1 are muscovite and quartz.
Particle size distribution of gangue minerals in flotation cleaned coal 1, d50＝11.48μm±10μm。d90＝40.22μm±30μm。
In certain embodiments, the X-ray diffraction pattern of flotation clean coal 2 from which the flotation concentrate is made shows diffraction peaks at 8.75 ° ± 0.1 °, 17.58 ° ± 0.1 °, 19.76 ° ± 0.1 °, 20.86 ° ± 0.1 °, 22.93 ° ± 0.1 °, 25.43 ° ± 0.1 °, 26.64 ° ± 0.1 °, 27.35 ° ± 0.1 °, 31.37 ° ± 0.1 °, 35.54 ° ± 0.1 °, 36.54 ° ± 0.1 °, 38.65 ° ± 0.1 °, 40.82 ° ± 0.1 ° and 50.14 ° ± 0.1 °.
As can be seen from the XRD spectrum of the flotation clean coal 2, the diffraction peaks appearing at 20.86 °, 26.64 °, 36.54 ° and 50.14 ° correspond to the (100), (101), (110) and (112) crystal planes of quartz, respectively; diffraction peaks at 8.75 °, 17.58 ° and 19.76 ° correspond to the (001), (002) and (020) crystal planes of muscovite mica, respectively; diffraction peaks appearing at 27.35 ° and 35.54 ° correspond to the (-220) and (-242) crystal planes of plagioclase, respectively; diffraction peaks appearing at 22.93 °, 25.43 °, 31.37 °, 38.65 ° and 40.82 ° correspond to the (111), (020), (012), (022) and (212) crystal planes of anhydrite, respectively. Therefore, the main gangue mineral compositions in the flotation clean coal 2 are muscovite, anhydrite, plagioclase and quartz.
Particle size distribution of gangue minerals in flotation cleaned coal 2, d50＝40μm±10μm。d90＝241μm±30μm。
The flotation concentrate prepared by selecting the flotation clean coal with the characteristics is beneficial to the subsequent ore grinding and dissociation efficiency and the separation of the ore and the coal sample.
In the step (1), a planetary ball mill or a stirring mill is adopted to carry out ore grinding dissociation on the coal sample.
In some embodiments, the particle size distribution after grinding and dissociating of the flotation concentrate containing muscovite and quartz is: d50＝13μm±2μm，
More preferably, d90＝62μm±2μm。
In the application, the addition amount of the flocculating agent in the step (2) is 0.1-0.5 wt%.
The addition amount of the flocculant is the mass percentage of the flocculant to the mass of the flotation concentrate.
In some embodiments, the stirring rate is controlled to be 1200-2500 r/min during agglomeration.
In this application, the flotation concentrate is ground and dissociated to a particle size distribution of: d5013 μm. + -. 2 μm, more preferably d90And (4) separating gangue from coal particles in the coal sample, wherein the gangue is 62 microns +/-2 microns.
Adding the coal sample after the line grinding ore dissociation and flocculating agent emulsified kerosene (PA) into a stirring tank in sequence, and then mechanically stirring at the stirring speed to agglomerate the fine coal particles to form larger coal particle agglomerates. The gangue is dispersed in the ore pulp by mechanical stirring. The particle size of the hydrophobic agglomerated coal flocs was measured using a Mastersize 2000 laser particle sizer, and the particle size distribution of the agglomerates was: d10＝35μm±2μm，d50＝95μm±2μm，d90＝147μm±2μm。
And performing at least one flotation on the agglomerated coal sample to obtain the ultra-pure coal.
After the coal sample is subjected to hydrophobic agglomeration, subsequent flotation is facilitated, and the coal particle agglomeration is well separated from gangue mineral particles. Thereby improving the purity of the coal sample.
Preferably, the agglomerated coal sample is subjected to one roughing and at least one fine dressing to obtain the ultra-pure coal.
In the present application, the roughing process includes: dispersing the agglomerated coal sample in water, adding a foaming agent and a dispersing agent into the dispersion system for flotation to obtain coarse clean coal, wherein the dispersing agent comprises water glass, sodium hexametaphosphate (LA) and sodium lignosulfonate (MHA). Sodium lignosulfonates are preferred.
In the step (3), the concentration process comprises the following steps: and dispersing the rough concentrate in water, and adding a foaming agent into the dispersion system for flotation to obtain clean coal.
In certain embodiments, the agglomerated coal sample is concentrated four times.
The blowing agent includes methyl isobutyl carbinol (MB).
In some embodiments, the amount of frothing agent is between 25g and 35g frothing agent per ton of agglomerated coal sample.
In some embodiments, the pH of the dispersion of the agglomerated coal sample is adjusted to 9.5-10.
Any pH regulator used in the coal flotation process disclosed by the prior art can be used, and the pH in the system can be regulated to 9.5-10.
In some embodiments, the amount of dispersant is 500g to 1000g of dispersant per ton of agglomerated coal sample.
In certain embodiments, in step (3), the time for each flotation treatment is 45s to 120 s.
In the roughing process, the concentration of ore pulp formed by coal sample dispersion and water after agglomeration is 9-11%.
In the application, the flotation clean coal is subjected to pre-tailing removal, ore grinding dissociation and hydrophobic agglomeration to obtain agglomerated coal particles with specific particle sizes. The agglomerated coal particles are easily separated from the ore in the subsequent flotation process, and then the ultra-pure coal is prepared.
Firstly, grinding ore to dissociate coal particles and gangue mineral particles, and then adding a flocculating agent and carrying out strong mechanical stirring to enable the fine coal particles to be effectively agglomerated. And adding a pH regulator and a dispersing agent into the agglomeration flotation system in the agglomeration flotation separation stage to enhance the dispersibility of coal particles and gangue mineral particles in the agglomeration flotation system, so as to reduce the ash content in the concentrate. The ash content in the concentrate is less than 1.0%. Coal containing dolomite and quartz is used as a raw material, when the dosage of a dispersant MHA is 1000g/t, the ash content in the concentrate is 0.94 percent, and the recovery rate of combustible bodies in the concentrate is 14.11 percent.
The method for producing agglomerated coal particles according to the present invention and the high purity coal sample produced by the method are further described below with reference to specific examples.
The properties of the flotation cleaned coal used in the examples below are as follows.
In the following examples, the method for detecting the ash content of an ultrapure coal sample comprises the following steps: a cupel which is pre-burned to be constant in mass is used, 1.0000g of coal sample after air drying is taken, the precision is 0.0005g, and the coal sample is uniformly spread in the cupel, so that the mass per square centimeter is not more than 0.15 g. Then the cupel is put into a muffle furnace with the temperature not exceeding 100 ℃, the furnace door is closed, and a gap of about 15mm is left on the furnace door. The temperature of the furnace was slowly raised to about 500 c for not less than 30min and maintained at this temperature for 30 min. The temperature is increased to 815 +/-10 ℃ continuously, and the mixture is burned for 1h at the temperature. And taking the cupel out of the furnace, placing the cupel on a heat-resistant porcelain plate, cooling the cupel in the air for about 5min, transferring the cupel into a dryer, cooling the cupel to room temperature, weighing the cupel and calculating the ash content of the coal sample.
Example 1:
the X-ray diffraction pattern of the raw flotation clean coal shows diffraction peaks appearing at 8.75 °, 17.58 °, 19.76 °, 20.86 °, 26.64 °, 36.54 ° and 50.14 °, as seen in fig. 1. Particle size distribution d of gangue minerals50＝11.48μm，d90＝40.22μm。
(1) Dispersing flotation clean coal in a flotation tank, wherein the concentration of the pulp is 10%, adding a proper amount of emulsified kerosene 0.5%, sodium lignosulfonate 500g/t and methyl isobutyl carbinol 25g/t into the pulp, carrying out flotation and bubble scraping, and separating a part of coal particles from gangue particles in the flotation clean coal to obtain flotation concentrate, wherein the ash content of the flotation concentrate is 3.94%.
(2) Grinding and dissociating the flotation concentrate obtained in the step 1 in a planetary ball mill, wherein the particle size distribution of coal sample ash after grinding is d10＝3.124μm，d50＝13.253μm，d90＝62.341μm。
(3) Dispersing the coal sample after ore grinding dissociation into a stirring tank, adjusting the concentration of the ore slurry to be 10%, adding flocculant emulsified kerosene into the ore slurry, wherein the adding amount of the emulsified kerosene is 0.2 wt%, the mass ratio of water to kerosene in the emulsified kerosene is 4.5:1, and mechanically stirring the ore slurry at the rotating speed of 1500r/min to ensure that the fine coal particles after ore grinding agglomerate to form coal particle aggregates, wherein the particle size of the aggregates is d10＝35.343μm，d50＝95.432μm，d90＝147.268μm。
(4) Dispersing the coal sample subjected to hydrophobic agglomeration in the step 3 into a flotation tank, adjusting the pH value of the ore slurry to be 10 after the concentration of the ore slurry is 5%, adding sodium lignosulfonate and methyl isobutyl carbinol into the ore slurry for rough flotation for 45s to obtain rough concentrate, wherein 1000g of sodium lignosulfonate is added into each ton of coal sample, and 30g of methyl isobutyl carbinol is added into each ton of coal sample.
And dispersing the rough concentrate into a flotation tank, wherein the concentration of the pulp is 5%, adding methyl isobutyl carbinol into the pulp to perform fine flotation for 45s to obtain concentrate 1, wherein 30g of methyl isobutyl carbinol is added into each ton of coal samples. Concentrate 1 was then subjected to 3 more fine flotations, the conditions of which were identical. Finally, the coal sample of the ultra-pure coal is obtained, and the ash content is 0.92%.
Example 2:
the X-ray diffraction pattern of the raw flotation clean coal shows diffraction peaks appearing at 8.75 °, 17.58 °, 19.76 °, 20.86 °, 22.93 °, 25.43 °, 26.64 °, 27.35 °, 31.37 °, 35.54 °, 36.54 °, 38.65 °, 40.82 ° and 50.14 °, as seen in fig. 3. Particle size distribution d of gangue minerals50＝40.27μm，d90＝241.91μm。
(1) Dispersing flotation clean coal in a flotation tank, wherein the concentration of the pulp is 10%, adding a proper amount of emulsified kerosene 0.5%, sodium lignosulfonate 500g/t and methyl isobutyl carbinol 25g/t into the pulp, carrying out flotation and bubble scraping, and separating a part of coal particles from gangue particles in the flotation clean coal to obtain flotation concentrate, wherein the ash content of the flotation concentrate is 5.50%.
(2) And (3) grinding and dissociating the flotation concentrate obtained in the step (1), wherein the particle size distribution of the ash content of the coal sample after grinding is attached to an attached figure 5.
(3) Dispersing the coal sample after ore grinding dissociation into a stirring tank, adjusting the concentration of the ore slurry to be 10%, adding a flocculating agent into the ore slurry to emulsify kerosene, wherein the adding amount of the emulsified kerosene is 0.4 wt%, the mass ratio of water to kerosene in the emulsified kerosene is 3.5:1, and mechanically stirring the ore slurry at the rotating speed of 2000r/min for 5min to ensure that the micro coal particles after ore grinding agglomerate to form coal particle floccules.
(4) And (3) dispersing the coal sample subjected to hydrophobic agglomeration in a flotation tank, adjusting the pH of the ore slurry to 9.5 when the concentration of the ore slurry is 5%, adding sodium hexametaphosphate and methyl isobutyl carbinol into the ore slurry to perform rough flotation for 45s to obtain rough concentrate, wherein 500g of sodium hexametaphosphate is added into each ton of coal sample, and 30g of methyl isobutyl carbinol is added into each ton of coal sample.
And dispersing the rough concentrate into a flotation tank, wherein the concentration of the pulp is 5%, adding methyl isobutyl carbinol into the pulp to perform fine flotation for 45s to obtain concentrate 1, wherein 30g of methyl isobutyl carbinol is added into each ton of coal samples. Concentrate 1 was then subjected to 2 more fine flotations, the conditions of which were identical. Finally, the coal sample of the ultra-pure coal is obtained, and the ash content is 0.90%.
Example 3
The process flow and process parameters were the same as in example 1, except that the type of flocculant was selected differently from example 1. The flocculant of this example was emulsified diesel oil with a water to diesel oil mass ratio of 5.1: 1. The ash content of the coal sample obtained after ore grinding, flocculation and flotation is 1.24%.
Claims (10)
1. A method of making hydrophobic agglomerated coal particles, comprising:
(1) grinding the flotation concentrate, wherein the particle size distribution of the flotation concentrate after grinding and dissociation is as follows: d10＝3μm±2μm。
(2) Dispersing the coal sample subjected to ore grinding dissociation and a flocculating agent in water to obtain an agglomerated coal sample, wherein the flocculating agent comprises emulsified kerosene, and the particle size distribution of agglomerated coal particles is as follows: d10＝35μm±2μm；
2. The method of claim 1, wherein in step (1), the particle size distribution after the ore grinding and dissociation of the flotation concentrate is as follows: d50＝13μm±2μm；
Preferably, d90＝62μm±2μm。
3. The method of claim 1 or 2, wherein said emulsified kerosene comprises kerosene and water;
preferably, the mass ratio of water to kerosene in the emulsified kerosene is 3.5:1 to 5: 1.
4. A method according to any one of claims 1 to 3, wherein the flocculating agent is added in step (2) in an amount of from 0.1% to 0.5% by weight.
5. The method according to claim 4, wherein the stirring rate is controlled to be 1200 to 2500r/min during the agglomeration.
6. The method of any one of claims 1 to 5, wherein the agglomerated coal particles have a particle size distribution of: d10＝35μm±2μm，
Preferably, d50＝95μm±2μm，
More preferably, d90＝147μm±2μm。
7. The process according to any one of claims 1 to 5, characterized in that the X-ray diffraction pattern of the flotation clean coal from which the flotation concentrate is prepared shows diffraction peaks appearing at 8.75 ° ± 0.1 °, 17.58 ° ± 0.1 °, 19.76 ° ± 0.1 °, 20.86 ° ± 0.1 °, 26.64 ° ± 0.1 °, 36.54 ° ± 0.1 ° and 50.14 ° ± 0.1 °.
8. The method of claim 7, wherein the gangue minerals have a particle size distribution, d, in the flotation concentrate50＝11μm±10μm；
Preferably, d90＝40μm±30μm。
9. The process according to any one of claims 1 to 5, characterized in that the X-ray diffractogram of flotation clean coal producing flotation concentrate shows diffraction peaks appearing at 8.75 ° ± 0.1 °, 17.58 ° ± 0.1 °, 19.76 ° ± 0.1 °, 20.86 ° ± 0.1 °, 22.93 ° ± 0.1 °, 25.43 ° ± 0.1 °, 26.64 ° ± 0.1 °, 27.35 ° ± 0.1 °, 31.37 ° ± 0.1 °, 35.54 ° ± 0.1 °, 36.54 ° ± 0.1 °, 38.65 ° ± 0.1 °, 40.82 ° ± 0.1 ° and 50.14 ° ± 0.1 °;
preferably, the particle size distribution of the gangue minerals in the flotation of the clean coal, d50＝40μm±10μm；d90＝241μm±30μm。
10. A method for producing ultra-pure coal, characterized in that the agglomerated coal particles produced by the method of any one of claims 1 to 9 are subjected to one roughing and at least one dressing to obtain ultra-pure coal.
Preferably, the roughing process comprises: dispersing the agglomerated coal sample in water, adding a pH regulator, a foaming agent and a dispersing agent into the dispersion system for flotation to obtain coarse clean coal, wherein the dispersing agent comprises water glass, sodium hexametaphosphate or sodium lignosulfonate;
the fine selection process comprises the following steps: and dispersing the rough concentrate in water, and adding a foaming agent into the dispersion system for flotation to obtain clean coal.
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