CN115007321A - Method for recovering carbon from gangue acid leaching residue - Google Patents
Method for recovering carbon from gangue acid leaching residue Download PDFInfo
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- CN115007321A CN115007321A CN202210336201.3A CN202210336201A CN115007321A CN 115007321 A CN115007321 A CN 115007321A CN 202210336201 A CN202210336201 A CN 202210336201A CN 115007321 A CN115007321 A CN 115007321A
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- carbon
- coal gangue
- ore pulp
- flotation
- acid leaching
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- 238000002386 leaching Methods 0.000 title claims abstract description 41
- 239000002253 acid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 59
- 238000005188 flotation Methods 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000004088 foaming agent Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims abstract description 6
- 238000007790 scraping Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 33
- 238000004090 dissolution Methods 0.000 claims description 16
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 10
- 229920000053 polysorbate 80 Polymers 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000003350 kerosene Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000010879 coal refuse Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- -1 polyoxyethylene octyl phenol Polymers 0.000 claims description 4
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 4
- 229940068968 polysorbate 80 Drugs 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
Classifications
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention discloses a method for recovering carbon from gangue acid leaching residue, which comprises the following steps: (1) stirring the acid leaching residue of the coal gangue and water in flotation equipment to prepare ore pulp with the concentration of 10-30%; (2) adjusting the pH value of the ore pulp to 6-9 under stirring; (3) adding a collecting agent into the ore pulp after the pH value is adjusted, uniformly stirring to collect carbon, then adding a synergist, uniformly stirring, finally gradually adding a foaming agent, starting air blowing and bubble scraping for flotation, and keeping water washing to maintain the volume of the ore pulp; (4) after flotation, solid-liquid separation is carried out to obtain high-carbon-content concentrate serving as a recovered carbon product and residual coal gangue acid leaching residue serving as low-carbon-content tailings. The method adopts a flotation method to recover high-grade carbon from the acid leaching residue of the coal gangue at low cost, has high flotation efficiency and high comprehensive recovery utilization rate of resources, and can obtain better sorting effect.
Description
Technical Field
The invention relates to a method for comprehensively utilizing coal gangue resources, in particular to a method for recovering carbon from coal gangue acid leaching residues after acid leaching of aluminum is carried out on coal gangue.
Background
Coal gangue is solid waste generated in the coal mining and coal washing processes, 3000 million tons of coal carbon per year is produced by taking a quasi-Georgi Daizi open pit mine in Erdos city of inner Mongolia as an example, and the discharge amount of the gangue is up to 1400 million tons per year. The piled coal gangue not only occupies land and pollutes the environment, but also the residual coal in the coal gangue pile can be spontaneously combusted when the temperature reaches the combustion point of combustible substances, thereby having potential safety hazard.
For example, the main mineral compositions in the coal gangue of the black Daichou open-pit coal mine are kaolinite and boehmite, and the main chemical composition is Al 2 O 3 、SiO 2 Also contains a small amount of Fe 2 O 3 、TiO 2 、CaO、MgO、 P 2 O 5 、K 2 O and Na 2 O, etc., wherein Al 2 O 3 35-38% of SiO 2 The content is 36-38%, and the ignition loss is 20-28%. If all the elements are recycled, the waste ore heap is changed into a product with practical value, the utilization rate of the coal gangue can be improved, and the waste is changed into valuable.
For the carbon resources in the coal gangue, because of the tight combination with the above mineral components, the difficulty of direct extraction is large, in the article "coal gangue flotation decarburization process research", the authors, xu bo, etc., propose a process idea of firstly crushing, flotation decarburization and then extracting aluminum from the coal gangue, however, the flotation decarburization process is complex, the requirement for crushing the coal gangue is high, and the decarburization effect is still general.
Patent CN112978734A provides a method for extracting carbon and silica from coal gangue, comprising: crushing and grinding the coal gangue, activating under the condition of supercritical water or subcritical water, carrying out solid-liquid separation, screening an enriched substance containing carbon and silicon dioxide, silicate and impurities from a solid slag phase through a shaking table, and then separating carbon from silicon dioxide by adopting electric separation to obtain high-grade carbon and silicon dioxide. At present, supercritical water has certain limitation in the application process of mineral activation (silicon-aluminum separation), and electricity selection has high power consumption, which is not beneficial to the realization of national double-carbon targets.
Patent CN106583415A provides a comprehensive utilization method of coal gangue components, clean coal and fine clean coal obtained by crushing, primary decarburization and deep decarburization of coal gangue can be directly used as power plant fuel, and tailings are used as chemical raw materials such as cement active mixing materials, concrete mineral admixtures and the like. The method has low added value of product.
The earlier research results show that the low-cost recovery of the aluminum in the gangue, such as CN111170372A, can be realized by crushing the gangue and directly leaching the gangue with hydrochloric acid. Through analysis and detection, the loss on ignition of the gangue acid leaching residue is about 40%, carbon is enriched in the acid leaching process, and an applicant considers that the gangue acid leaching residue needs to be recycled or the acid leaching residue needs to be recycled after being subjected to further alkali dissolution, so that the gangue resource can be better and comprehensively utilized.
The flotation method has the advantages of strong adaptability, high efficiency, high comprehensive recovery utilization rate of resources and the like, and can obtain better sorting effect when being applied to recovering carbon in acid leaching residues. However, the applicant researches and discovers that the surface property of the gangue is complex after being leached by hydrochloric acid, the hydrophilicity of the surface is increased, the flotation activity is lower than that of coal, the unburned carbon is difficult to recover by flotation, the conventional flotation effect is poor, and the loss on combustion of tailings is high. In order to improve the recovery rate to the utmost extent, a flotation method needs to be developed pertinently so as to fully recycle the coal gangue resources.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a method for recovering carbon from coal gangue acid leaching residues, so as to realize comprehensive utilization of coal gangue resources.
In order to realize the aim, the method for recovering carbon from the acid leaching residue of the coal gangue adopts the following technical scheme:
a process for recovering carbon from a coal gangue acid leach residue, the process comprising:
(1) stirring the acid leaching residue of the coal gangue and water in flotation equipment to prepare ore pulp with the concentration of 10-30%;
(2) adjusting the pH value of the ore pulp to 6-9 under stirring;
(3) adding a collecting agent into the ore pulp after the pH value is adjusted, uniformly stirring to collect carbon, then adding a synergist, uniformly stirring, finally gradually adding a foaming agent, starting air blowing and bubble scraping for flotation, and keeping water washing to maintain the volume of the ore pulp;
wherein the collecting agent is 0# diesel oil and/or kerosene according to the mass of the slurry in the step (1), and the adding amount is 2000-6000 g/t; the synergist is polysorbate-80 (Tween-80) and/or octanol, and the adding amount is 500-2000 g/t; the foaming agent is polyoxyethylene octyl phenol ether-10 (OP-10) and/or 2# oil, and the addition amount is 300-800 g/t;
(4) after flotation, solid-liquid separation is carried out to obtain high-carbon-content concentrate serving as a recovered carbon product and residual coal gangue acid leaching residue serving as low-carbon-content tailings.
In the step (1), the gangue acid leaching residue and water are stirred in a flotation device to prepare ore pulp, and preferably, the concentration of the ore pulp is 20-25%. The flotation equipment may be an aerated mechanically agitated flotation machine as is well known in the art and will not be described in detail here.
In the step (2), a pH regulator can be added to adjust the pH value of the ore pulp, wherein the pH regulator can be ammonia water, quicklime, aluminum hydroxide, sodium carbonate, sodium silicate and the like, and preferably sodium hydroxide and water glass; the preferable concentration of the pH regulator is 0.5-2%, and the preferable concentration is 1-1.5%; the pH value of the slurry after adjustment is preferably 7-8.
In the step (3), for acid-leaching coal gangue residues, in order to recover carbon more efficiently and sufficiently, in one embodiment, the collecting agent is kerosene, the synergist is polysorbate-80, the foaming agent is polyoxyethylene octylphenol ether-10, and the three are combined to achieve a good carbon recovery effect on the coal gangue acid-leaching residues; preferably, the collector is added at 3000-5000 g/t, such as 3500g/t, 4000g/t or 4500g/t, the synergist is added at 800-1200 g/t, such as 900g/t, 1000g/t or 1100g/t, and the foaming agent is added at 400-600 g/t, such as 450g/t, 500g/t or 550g/t, based on the mass of the slurry in step (1).
In one embodiment, in step (3), to better match the collector, synergist and frother, the synergist is added immediately after the collector is added, and then the frother is added gradually after stirring is continued for 3-8min, for example by using a metering pump. In the present invention, "immediately" means within 1 min; wherein the synergist is added all at once.
In one embodiment, in steps (1) - (3), the stirring speed is 1500-2200 rpm, preferably 1800-2000 rpm. In the present invention, the flotation may be performed at room temperature, such as 20-30 ℃, e.g. 25 ℃.
The invention also provides a comprehensive utilization method of coal gangue resources, which comprises the steps of crushing coal gangue, acid-dissolving with hydrochloric acid and carrying out solid-liquid separation to obtain coal gangue acid-leaching residue and aluminum chloride acid leaching solution, then preparing alumina by using the aluminum chloride acid leaching solution, and recovering carbon from the coal gangue acid-leaching residue by the method.
In one embodiment of the invention, the coal refuse is pulverized by pulverizing the coal refuse to a particle size of 100 mesh or less (taylor standard sieve), such as 120 mesh, 150 mesh or 200 mesh.
In the invention, the crushed coal gangue is subjected to hydrochloric acid dissolution to dissolve out aluminum therein, solid-liquid separation is performed, and insoluble residues are filtered to obtain hydrochloric acid leachate, wherein a specific acid dissolution process can be seen in chinese patent application CN 102145905 a. Specifically, when hydrochloric acid dissolution is carried out, the concentration of hydrochloric acid is 20-30 wt%, the molar ratio of HCl in hydrochloric acid to alumina in fly ash is 4:1-9:1, the dissolution temperature is 100-200 ℃, preferably 130-150 ℃, the dissolution pressure is 0.5-2.5MPa, preferably 0.8-1.0MPa, and the dissolution time is 1-4 h, preferably 1.5-2.5 h; and carrying out solid-liquid separation after acid dissolution to obtain an aluminum chloride solution.
Compared with the prior art, the invention has the following advantages:
(1) the method adopts a flotation method to recover high-grade carbon from the acid leaching residue of the coal gangue at low cost, has high flotation efficiency and high comprehensive recovery utilization rate of resources, and can obtain better sorting effect.
(2) When the coal gangue resources are comprehensively utilized, the coal gangue resources are firstly crushed and subjected to acid leaching, so that carbon data are enriched, and the carbon resources are not combined with other minerals abnormally and tightly, so that a better sorting effect can be achieved during subsequent flotation carbon recovery, the high requirement on coal gangue crushing is reduced, the cost is saved, and the process is simplified.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the examples listed, and it should also include equivalent modifications and variations to the technical solutions defined in the claims appended to the present application.
In the following examples, the coal gangue used was obtained from a standard black Dai open pit coal dressing plant and the contents of the main elements are shown in Table 1. Crushing the powder to 100 meshes, and performing acid dissolution treatment by hydrochloric acid under the following conditions: putting the crushed coal gangue into an acid-proof reaction kettle, adding 22 wt% hydrochloric acid for acid dissolution, wherein the molar ratio of HCl in the hydrochloric acid to alumina in the ash is 5:1, the reaction temperature is 150 ℃, the reaction time is 2 hours, and the reaction pressure is 1.0 Mpa; after the reaction, carrying out solid-liquid separation to obtain an aluminic chloride acid leaching solution and gangue acid leaching residue.
The main components of the obtained coal gangue acid leaching residue are also shown in the table 1.
TABLE 1 solid sample composition before and after dissolution (ω (B)/10 -2 )
| SiO 2 | Al 2 O 3 | TiO 2 | CaO | MgO | Fe 2 O 3 | K 2 O | Na 2 O | LOI | |
| Coal gangue | 42.66 | 39.06 | 0.46 | 0.06 | 0.03 | 0.38 | 0.09 | 0.11 | 17.36 |
| Acid leaching residue | 50.36 | 5.26 | 1.16 | 0.00 | 0.02 | 0.13 | 0.03 | 0.04 | 43.29 |
Example 1
(1) Preparing ore pulp with the solid content of 25% by using acid leaching residues and water, pouring the ore pulp into an inflatable mechanical stirring type flotation machine, and uniformly stirring at the flotation temperature of 25 ℃ and the stirring speed of 1800 rpm;
(2) adding a water glass regulator to regulate the pH value of the ore pulp obtained in the step (1) and stirring, wherein the concentration of the regulator is 2%; adjusting the pH value of the slurry to 7;
(3) adding a kerosene collecting agent to collect carbon, immediately adding a Tween-80 synergist, stirring for 5min, gradually adding a foaming agent OP-10 to start air blowing, simultaneously starting foam scraping, and continuously flushing to keep the volume of the ore pulp unchanged. The adding amount of kerosene is 3000g/t according to the mass of the ore pulp obtained in the step (1); the addition amount of the synergist Tween-80 is 800 g/t; the addition amount of the foaming agent OP-10 is 500 g/t;
(4) and (4) after the concentrate and the tailings are filtered, drying and weighing, and sampling to measure the ignition loss.
Example 2:
(1) preparing ore pulp with the solid content of 25% by using acid leaching residues and water, pouring the ore pulp into an inflatable mechanical stirring type flotation machine, and uniformly stirring at the flotation temperature of 25 ℃ and the rotation speed of 2000 r/min;
(2) adding a water glass regulator to regulate the pH value of the ore pulp obtained in the step (1) and stirring, wherein the regulator is 1%; the pH value of the slurry after adjustment is 6;
(3) adding 0# diesel oil collector to collect carbon, immediately adding the sec-octanol synergist, stirring for 5min, gradually adding the foaming agent OP-10 to start air blowing, simultaneously starting foam scraping, and continuously flushing to keep the volume of the ore pulp unchanged. The adding amount of kerosene is 3000g/t according to the mass of the ore pulp obtained in the step (1); the adding amount of the synergist Tween-80 is 800 g/t; foaming agent OP-10, 1000 g/t;
(4) and (4) after the concentrate and the tailings are filtered, drying and weighing, and sampling to measure the ignition loss.
Example 3:
(1) preparing ore pulp with the solid content of 20% by using the acid leaching residues and water, pouring the ore pulp into an inflatable mechanical stirring type flotation machine, and uniformly stirring at the flotation temperature of 25 ℃ and the rotation speed of 1500 r/min;
(2) adding a sodium hydroxide regulator to regulate the pH value of the ore pulp obtained in the step (1) and stirring, wherein the concentration of the regulator is 2%; adjusting the pH value of the slurry to 7;
(3) adding a kerosene collecting agent to collect carbon, immediately adding a Tween-80 synergist, stirring for 8min, gradually adding a foaming agent OP-10 to start air blowing, simultaneously starting foam scraping, and continuously flushing to keep the volume of the ore pulp unchanged. According to the mass of the ore pulp obtained in the step (1), the addition amount of kerosene is 4000 g/t; the adding amount of the synergist Tween-80 is 500 g/t; the addition amount of the foaming agent OP-10 is 1000 g/t;
(4) and (4) after the concentrate and the tailings are filtered, drying and weighing, and sampling to measure the ignition loss.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes or modifications of the technical solution of the present invention are within the spirit of the present invention.
Claims (10)
1. A method for recovering carbon from coal gangue acid leaching residue, which is characterized by comprising the following steps:
(1) stirring the acid leaching residue of the coal gangue and water in flotation equipment to prepare ore pulp with the concentration of 10-30%;
(2) adjusting the pH value of the ore pulp to 6-9 under stirring;
(3) adding a collecting agent into the ore pulp after the pH value is adjusted, uniformly stirring to collect carbon, then adding a synergist, uniformly stirring, finally gradually adding a foaming agent, starting air blowing and bubble scraping for flotation, and keeping water washing to maintain the volume of the ore pulp;
wherein the collecting agent is 0# diesel oil and/or kerosene according to the mass of the slurry in the step (1), and the adding amount is 2000-6000 g/t; the synergist is polysorbate-80 and/or octanol, and the addition amount is 500-2000 g/t; the foaming agent is polyoxyethylene octyl phenol ether-10 and/or 2# oil, and the addition amount is 300-800 g/t;
(4) after flotation, solid-liquid separation is carried out to obtain high-carbon-content concentrate serving as a recovered carbon product and residual coal gangue acid leaching residue serving as low-carbon-content tailings.
2. The method according to claim 1, wherein the collector is kerosene and is added in an amount of 3000-5000 g/t.
3. The method according to claim 2, wherein the synergist is polysorbate-80, and the addition amount is 800-1200 g/t.
4. The method according to claim 3, wherein the foaming agent is polyoxyethylene octylphenol ether-10, and the addition amount is 400-600 g/t.
5. The method according to any one of claims 1-4, characterized in that sodium hydroxide or water glass is used for adjusting the pH value of the ore pulp in the step (2), and the pH value of the ore pulp after adjustment is 7-8.
6. The method according to any one of claims 1 to 5,
in the step (3), the collecting agent is added, then the synergist is immediately added, and then the foaming agent is gradually added after the mixture is continuously stirred for 3-8 min.
7. The process according to any one of claims 1 to 6, wherein in steps (1) to (3) the stirring is carried out at a speed of 1500 to 2200 revolutions per minute, preferably 1800 to 2000 revolutions per minute.
8. A comprehensive utilization method of coal gangue resources is characterized by comprising the steps of crushing coal gangue, carrying out acid dissolution by hydrochloric acid and carrying out solid-liquid separation to obtain coal gangue acid leaching residue and chloroaluminate leaching solution, then preparing alumina by using the chloroaluminate leaching solution, and recovering carbon from the coal gangue acid leaching residue according to the method of any one of claims 1 to 7.
9. The coal refuse resource comprehensive utilization method according to claim 8, wherein the coal refuse is pulverized while the particle size of the coal refuse is pulverized to 100 meshes or less.
10. The coal gangue resource comprehensive utilization method of claim 8 or 9, wherein when the hydrochloric acid dissolution is performed, the hydrochloric acid concentration is 20-30 wt%, the molar ratio of HCl in the hydrochloric acid to alumina in the coal gangue is 4:1-9:1, the dissolution temperature is 100-200 ℃, the dissolution pressure is 0.5-2.5MPa, and the dissolution time is 1h-4 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210336201.3A CN115007321A (en) | 2022-03-31 | 2022-03-31 | Method for recovering carbon from gangue acid leaching residue |
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