CN109201342B - Low-rank coal slime flotation collecting agent compounded with acid ester ether and preparation method thereof - Google Patents
Low-rank coal slime flotation collecting agent compounded with acid ester ether and preparation method thereof Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 144
- 238000005188 flotation Methods 0.000 title claims abstract description 122
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 34
- 239000002253 acid Substances 0.000 title claims abstract description 25
- 150000002148 esters Chemical class 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 31
- NKJOXAZJBOMXID-UHFFFAOYSA-N 1,1'-Oxybisoctane Chemical compound CCCCCCCCOCCCCCCCC NKJOXAZJBOMXID-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 12
- XSIFPSYPOVKYCO-UHFFFAOYSA-N butyl benzoate Chemical compound CCCCOC(=O)C1=CC=CC=C1 XSIFPSYPOVKYCO-UHFFFAOYSA-N 0.000 claims description 30
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 claims description 30
- 229930195733 hydrocarbon Natural products 0.000 claims description 25
- 150000002430 hydrocarbons Chemical class 0.000 claims description 25
- 239000002283 diesel fuel Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 14
- 239000003250 coal slurry Substances 0.000 claims description 13
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims description 11
- AOPDRZXCEAKHHW-UHFFFAOYSA-N 1-pentoxypentane Chemical compound CCCCCOCCCCC AOPDRZXCEAKHHW-UHFFFAOYSA-N 0.000 claims description 10
- 239000012141 concentrate Substances 0.000 claims description 9
- 239000004088 foaming agent Substances 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000007796 conventional method Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 22
- 238000011084 recovery Methods 0.000 description 18
- 239000000126 substance Substances 0.000 description 10
- 238000009472 formulation Methods 0.000 description 7
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010117 shenhua Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000892564 Ulmus parvifolia Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VECVSKFWRQYTAL-UHFFFAOYSA-N octyl benzoate Chemical compound CCCCCCCCOC(=O)C1=CC=CC=C1 VECVSKFWRQYTAL-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- B03D2201/02—Collectors
-
- 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
Abstract
The invention provides a flotation collector for low-rank coal slime compounded with acid ester ether and a preparation method thereof, wherein the collector comprises the following components in percentage by mass: c10‑C16Hydrocarbon oil 60-85%, preferably 70-80%, and more preferably 75-80%; c6‑C85-15% of acid, preferably 7-12%; c10‑C18Esters 5-15%, preferably 5-8%; 5-15%, preferably 8-10% of an ether C4‑C10Or n-octyl ether. The collecting agent provided by the invention has the advantages of simple components, low medicament consumption, low flotation cost, high separation efficiency and remarkable economic benefit, and can be used for flotation of low-rank coal slime by a conventional method.
Description
Technical Field
The invention relates to the technical field of coal slime flotation, in particular to a low-rank coal slime flotation collecting agent and a preparation method and application thereof.
Background
The low-rank coal is a coal type with low metamorphic grade, mainly comprises brown coal, long flame coal, weakly caking coal, non-caking coal and the like, and accounts for more than 50% of coal reserves in China. Wherein the fine coal with the particle size of-0.5 mm is called low-rank coal slime and has the outstanding characteristics of poor hydrophobicity, fine granularity, large specific surface area and the like. The flotation is the most extensive method for separating fine-grained minerals, so that the ash reduction and quality improvement of fine-grained coal slime can be effectively realized, and the utilization value of the fine-grained coal slime is improved. However, the conventional collecting agents (such as diesel oil, kerosene and the like) are used for flotation of low-rank coal slime, so that the problems of high medicine consumption, high flotation cost and the like exist, and the low-rank coal slime is difficult to realize economic and efficient separation. Therefore, a large amount of low-rank coal slime which is not sorted and upgraded is selected to be doped with the fine clean coal for sorting, so that the quality of the power coal product is reduced, and the combustion pollution is serious; and for part of medium-high-ash low-rank coal slime (ash content is more than 40%), the part of the medium-high-ash low-rank coal slime is discarded to gangue due to extremely low utilization value, and spontaneous combustion and dust emission hazards exist. Due to the lack of economic and effective ash reduction and quality improvement means, the low-rank coal slime is not smooth in outlet and becomes a key problem restricting the clean and efficient utilization of coal in China.
Because the surface of the low-rank coal slime contains a plurality of oxygen functional groups, a hydration film formed on the surface of the low-rank coal slime is relatively thick, the conventional collecting agent is difficult to spread on the surface to obviously improve the surface hydrophobicity of the low-rank coal slime, and the recovery rate of the low-rank coal slime is often improved by increasing the using amount of the collecting agent. In the flotation separation, when diesel oil is used as a collecting agent, the consumption of coal slime per ton is over 8kg/t, and even reaches 50kg/t, and the expensive medicament cost makes the low-rank coal flotation uneconomical. The Chinese patent application 201110195118.0 proposes a system and a method for deep purification of coal, which uses the unconventional flotation technology, namely oil bubble flotation, for sorting low-rank coal slime, thereby successfully sorting the low-rank coal slime with low medicine consumption. The method has certain potential safety hazard due to the existence of a medicament heating link, so that the method is difficult to popularize and apply. Therefore, aiming at the current situations that the conventional reagent for flotation of the low-rank coal slime has high medicine consumption and high cost and the unconventional flotation method has poor operability, the special high-efficiency reagent suitable for conventional flotation of the low-rank coal slime is developed, so that the flotation upgrading of the power coal slime in China and the high-efficiency clean utilization of coal resources are facilitated, and the special high-efficiency reagent has great significance for reducing coal pollution and improving the economic efficiency of coal enterprises.
Chinese patent application 201710067078 discloses a low-rank coal slime flotation collector and application thereof, wherein the collector comprises hydrocarbon oil and accelerant, and the hydrocarbon oil is C10-C1660-75% of hydrocarbon oil; the accelerant is C6-C8Acid 8-15%, C10-C18Ester 4-8%, C5-C7Ketones 6-12% and C5-C9And 7-13% of aldehyde. The collecting agent is used for flotation of low-rank coal slime, so that the medicament consumption can be reduced, and the separation efficiency is improved. However, the components are still more and complex, so that the components of the mineral processing operation wastewater are complex, toxic and harmful components are increased, the industrial cost is increased, and the harm to the life is easy to occurA state environment.
Disclosure of Invention
In view of the above, the invention provides a low-rank coal slime flotation collector compounded with acid ester ether, which has the advantages of simple components, low reagent consumption, low flotation cost, high separation efficiency and obvious economic benefit, and the collector obtained by compounding a small amount of reagent can be used for conventional low-rank coal slime flotation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a flotation collector for low-rank coal slime of compound acid ester ether, which comprises the following components in percentage by mass:
C10-C16hydrocarbon oil 60-85%, preferably 70-80%, and more preferably 75-80%;
C6-C85-15% of acid, preferably 7-12%;
C10-C18esters 5-15%, preferably 5-8%;
5-15%, preferably 8-10% of an ether C4-C10Or n-octyl ether.
Collector of the invention, with addition of C only10-C16Hydrocarbon oil, C6-C8Acid, C10-C18Esters and C4-C10The low-rank coal collecting agent suitable for the conventional flotation method can be obtained by using ether, the components are simple, the defects of complex wastewater components, more toxic and harmful components and the like in the flotation process are avoided, the harm to the ecological environment is reduced, and the cost is reduced. Meanwhile, the collecting agent with simple components can achieve excellent flotation effect under the condition of less medicament consumption.
In a preferred embodiment, the collector of the invention is C in mass percent10-C16Hydrocarbon oils comprise 70-80%, e.g., 70%, 73%, 75%, 78%, 80%, etc., preferably 75-80%; said C is6-C8Acids are present at 7-12%, e.g., 7%, 9%, 10%, 12%, etc.; said C is10-C18Esters comprise 5-8%, e.g., 5%, 6%, 7%, 8%, etc.; said C is4-C10The ether or n-octyl ether is 8-10%, such as 8%, 9%, 10% etc. When the collecting agent with the optimal proportion is used for flotation of low-rank coal slime, the yield of the obtained flotation concentrate is high and reaches more than 60 percent, even 65-85 percent, and the recovery rate of combustible bodies of the concentrate is high and reaches more than 83 percent, even 85-95 percent under the condition of lower medicament consumption.
In a preferred embodiment, the coal slime flotation collector comprises the following components in percentage by mass: c10-C16Hydrocarbon oil 70%, C6-C8Acid 12%, C10-C18Ester 8%, C4-C10Ether or n-octyl ether account for 10%;
in a preferred embodiment, C10-C1680% of hydrocarbon oil, C6-C8Acid 7%, C10-C18Ester content 5%, C4-C10Ether or n-octyl ether 8%;
in a preferred embodiment, C10-C1675% of hydrocarbon oil, C6-C8Acid 10%, C10-C18Ester 7% by weight, C4-C10Ether or n-octyl ether accounted for 8%.
C10-C16The hydrocarbon oil may be, for example, C10、C11、C12、C13、C14、C15、C16Any one or a combination of two or more of hydrocarbon oils; preferably, the hydrocarbon oil is selected from at least one of diesel oil or kerosene.
C6-C8The acid may be, for example, C6、C7、C8Any one or a combination of two or more of acids; preferably, the acid is selected from at least one of n-octanoic acid or a homologue thereof, preferably at least one of n-octanoic acid and n-hexanoic acid.
C10-C18The ester may be, for example, C10、C12、C14、C16、C18Esters and the like, preferably, the esters include at least one of butyl benzoate or a homolog thereof.
C4-C10The ether may be, for example, C4、C5、C6、C7、C8、C9、C10Any one or a combination of two or more of ethers; preferably, the ether comprises at least one of n-amyl ether or homologues thereof, preferably at least one of n-amyl ether and n-butyl ether, and better flotation effect can be achieved by adopting the preferred ether, so that the yield of flotation concentrate and the recovery rate of combustible bodies of the concentrate are improved.
In a preferred scheme, in the collector of the invention, the hydrocarbon oil is diesel oil and/or kerosene, the acid is at least one of n-caprylic acid or n-caproic acid, the ester is at least one of butyl benzoate or homologues thereof, and the ether is at least one of n-amyl ether or n-butyl ether. More preferably, the components are mixed according to the proportion that the hydrocarbon oil accounts for 70-80 percent, preferably 75-80 percent, the acid accounts for 7-12 percent, the ester accounts for 5-8 percent and the ether accounts for 8-10 percent, so that more excellent flotation effect can be obtained at lower medicine consumption. The per ton coal slime consumption of the collecting agent can be 0.5-2.8 kg/t.
The second aspect of the invention provides a preparation method of the low-rank coal slime flotation collector of the complex acid ester ether, which comprises the following steps:
mixing hydrocarbon oil with acid, ester and ether to obtain the collector; preferably, acid, ester and ether are added into hydrocarbon oil, and the mixture is stirred for more than 15min, preferably 15-25min, so as to obtain the collector.
The flotation collector is used for flotation of low-rank coal slime, the medicament consumption is small, the flotation cost is low, the separation efficiency is high, the economic benefit is obvious, the yield of flotation concentrate reaches more than 60%, more 65-85%, and the combustible recovery rate of the concentrate reaches more than 83%, more 85-95%. Specifically, the flotation mainly comprises the following steps:
preparing coal slime into flotation pulp, adding the collecting agent and the foaming agent into the flotation pulp, stirring the mixture, and then feeding the mixture into flotation equipment for separation to obtain flotation concentrate and flotation tailings;
preferably, the concentration of the flotation pulp is 60-100g/L, such as 60, 70, 80, 90, 100g/L and the like;
preferably, the consumption of the collecting agent per ton of coal slime is 0.5-2.8kg/t, such as 0.5kg/t, 1.9kg/t, 2.0kg/t, 2.5kg/t, 2.8kg/t and the like, preferably 1.9-2.8kg/t, the flotation effect is better, and the recovery rate of clean coal combustible bodies and the yield of concentrate are higher; preferably, the frother has a consumption of 0.1-0.5kg/t, e.g. 0.1kg/t, 0.2kg/t, 0.4kg/t, 0.5kg/t, etc. per ton of coal slurry.
Preferably, the blowing agent comprises at least one of sec-octanol or fusel alcohol.
The low-rank coal of the invention refers to: the coal with low metamorphic grade mainly comprises brown coal, long flame coal, weakly caking coal, non-caking coal and the like.
The technical scheme provided by the invention has the following beneficial effects:
the invention adds a small amount of C in the conventional medicament (non-polar hydrocarbon oil)4-C10Ethers or n-octyl ethers, especially n-pentyl ether and its homologues and/or n-butyl ether as promoters with C6-C8Acid and C10-C18The ester is used together as an accelerant, so that the ester can not only act with oxygen-containing functional groups on the surface of low-rank coal slime to effectively cover polar groups on the surface of the coal slime, but also obviously improve the surface hydrophobicity of the coal slime; meanwhile, the polar oxygen-containing group can be adsorbed to a gas-liquid interface, so that hydrocarbon oil can be adsorbed on the surface of bubbles to form stable oil bubbles with stronger hydrophobicity. Under the double modification action of the surfaces of the coal particles and the bubbles, the flotation mineralization process of the low-rank coal slime is strengthened, and the adhesion probability of hydrophobic coal particles and the bubbles is enhanced, so that the flotation efficiency is obviously improved, and the chemical consumption is reduced. The collecting agent containing the ether promoter and the hydrocarbon oil in the preferable proportion is adopted, so that the surface modification of the oxygen-containing functional group and the pores on the specific surface of the low-rank coal slime is realized, and the actual flotation test research and verification are obtained.
The flotation collector is added into the coal slime pulp by a traditional simple flotation method, and economic and efficient separation can be completed in separation equipment after stirring for a short time; compared with the existing low-rank coal slime flotation collector, the flotation process is simplified, and meanwhile, the production cost is reduced.
The collecting agent is applied to flotation of low-rank coal slime, and is low in medicine consumption and high in separation efficiency. The agent is used as the low-rank coal slime flotation collector, the consumption of the agent per ton of coal slime flotation is 0.5-2.8kg/t, the recovery rate of the flotation combustible body can reach more than 83%, the agent is superior to the consumption of the existing low-rank coal slime flotation compounded collector, and the agent cost of flotation is further reduced.
The collecting agent has wide source and is easy to obtain. The main component of the medicament is hydrocarbon oil which is common in coal chemical industry byproducts, the price is low, the source is wide, and the added accelerant is a common chemical product, so that the trading market is mature, quick and easy to obtain.
The collector can also solve the technical problems of complex components of an accelerant used by the low-rank coal slime flotation collector, high beneficiation wastewater treatment cost and the like in the prior art.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the following examples, the information on the materials and equipment used is shown in table 1 below:
TABLE 1 materials or Equipment information Table
| Material/apparatus | Manufacturer of the product | type/Property |
| High-alumina long flame coal | Shenhua quasi-energy black and Dai ditch coal dressing plant | Long flame coal |
| Supernatural weak sticky coal | Ulmus chinensis jin He Limited liability company | Weakly caking coal |
| Shendong long flame coal | Shenhua Shendong Bourtai coal preparation plant | Long flame coal |
| Diesel oil | China petrochemical | No. 0 diesel oil |
| Flotation machine | Jilin prospecting machinery plant | 1.5L XFD type slot-hanging flotation machine |
Example 1
Coal slime property: the coal sample is from high-alumina long-flame coal from Shenhua quasi-energy black Daizi coal preparation factories, the inner ash of the coal slime is high, and the ash content of the fed coal slime is 37 percent. The granularity of the coal sample is fine, and the coal slime with the granularity of-0.074 mm accounts for 60 percent of the coal sample.
The operating conditions are as follows: A1.5L XFD type slot-hanging flotation machine is adopted, and the rotating speed of a main shaft is 2000 rpm. Weighing 120g of dry coal slime, pouring the dry coal slime into a flotation tank filled with tap water to prepare flotation pulp (the pulp concentration is 80g/L), adding a collecting agent, stirring for 3min, adding a foaming agent, namely octanol, stirring for 30s, and introducing gas (the aeration quantity is 0.25 m)3Blowing for 3min after the reaction is finished, respectively filtering, drying and weighing the scraped foam and residues at the bottom of the tank, namely flotation clean coal and flotation tail coal, and calculating to obtain the product combustible body recoveryAnd (4) rate. The flotation comparison results of the agent of the invention and the common collector diesel are shown in table 2.
Examples 1 to 1
In the embodiment 1-1, the flotation collector comprises 70% of diesel oil, 12% of n-caprylic acid, 8% of butyl benzoate and 10% of n-amyl ether by mass fraction. The preparation process comprises the following steps: mixing diesel oil, n-caprylic acid, butyl benzoate and n-amyl ether in proportion, and stirring at the speed of 1000rpm for 15min to obtain the flotation collector.
Examples 1 to 2
Examples 1-2 are similar to examples 1-1 except that the collector formulation is: 60% of diesel oil, 15% of n-octanoic acid, 10% of butyl benzoate and 15% of n-amyl ether.
Examples 1 to 3
Examples 1-3 are similar to examples 1-1 except that the collector formulation is: 80% of diesel oil, 7% of n-hexanoic acid, 5% of octyl benzoate and 8% of n-butyl ether.
Examples 1 to 4
Examples 1-4 are similar to examples 1-1 except that the collector formulation is: 75% of diesel oil, 10% of n-octanoic acid, 7% of butyl benzoate and 8% of n-butyl ether.
Examples 1 to 5
Examples 1-5 are similar to examples 1-1 except that the collector formulation is: 75% of diesel oil, 10% of n-octanoic acid, 7% of butyl benzoate and 8% of n-octyl ether.
Examples 1 to 6
Examples 1-6 are similar to examples 1-1 except that the collector formulation is: 75% of diesel oil, 10% of n-octanoic acid, 7% of butyl benzoate and 8% of diethyl ether.
Examples 1 to 7
Examples 1-7 are similar to examples 1-1 except that the collector formulation is: 75% of diesel oil, 10% of n-octanoic acid, 7% of butyl benzoate and 8% of water.
Wherein, the ash content detection instrument is an ash content volatile content tester, a model CTM300 of Xuzhou Weike science and technology Limited company.
The fed coal slurry ash refers to the fed dry-basis ash of the raw coal for flotation.
The combustible recovery rate of clean coal is specified by a coal flotation evaluation method (MT259-91), and the calculation formula is as follows:
in the formula: ecThe recovery rate of combustible bodies of the flotation clean coal is percent; r iscYield of flotation clean coal,%; a. thed,cIs flotation clean coal dry basis ash content percent; a. thed,fIs the flotation feed dry basis ash content percent.
Table 2 example 1 comparison of collectors with conventional diesel flotation index (high alumina long flame coal)
As can be seen from Table 2, when the consumption of the collector in the embodiment 1-1 is 2.0kg/t, the recovery rate of the clean coal combustible substance reaches 83.39%, the ash content of the clean coal is 14.17%, the flotation index is obviously better than the index when the consumption of the diesel oil is 9kg/t, the recovery rate of the combustible substance is only 77.06%, and the ash content of the clean coal is 15.37%. It can be seen that the invention achieves a significantly improved flotation effect with a greatly reduced consumption. The collector consumption of examples 1-1 at 2.0kg/t was comparable to the collector consumption of examples 1-3 and 1-4 at 2.0 kg/t. In the embodiment 1-1, when the consumption of the collecting agent is 2.8kg/t, the recovery rate of the combustible body of the clean coal reaches 92.57%, the ash content of the clean coal is 14.96%, and the flotation effect is further improved. Comparison of examples 1-4, examples 1-5, and examples 1-6 and 1-7 it was found that the collector formulations of the present invention employ C4-C10The ether can effectively improve the flotation of the low-rank coal slime.
Example 2:
coal slime property: the coal sample is derived from supernatural weakly caking coal, and the fed coal slime has 30 percent of ash content. Coal slime with the size fraction of-0.074 mm accounts for 65% of the coal sample.
The operating conditions are as follows: A1.5L XFD type slot-hanging flotation machine is adopted, and the rotating speed of a main shaft is 2000 rpm. 120g of dry coal slime is weighed and poured into tap waterPreparing flotation pulp (pulp concentration is 80g/L) in the flotation tank, adding a collecting agent, stirring for 3min, adding a foaming agent, namely octanol, stirring for 30s, and introducing gas (the aeration quantity is 0.25 m)3And/h) then carrying out foam scraping for 3min, wherein the scraped foam and residues at the bottom of the tank are flotation clean coal and flotation tail coal, respectively filtering, drying and weighing, and calculating to obtain the recovery rate of combustible products. The flotation comparison results of the agent of the present invention and the common collector diesel are shown in table 3.
In example 2, the flotation collector is prepared from, by mass, 76% of diesel oil, 8% of n-hexanoic acid, 6% of butyl benzoate and 10% of n-butyl ether. The preparation process comprises the following steps: and mixing diesel oil, n-hexanoic acid, butyl benzoate and n-butyl ether in proportion, and stirring at the speed of 1000rpm for 25min to obtain the flotation collector.
Table 3 example 2 comparison of collectors with common collectors for diesel flotation index (superwood weakly caking coal)
As can be seen from Table 3, in example 2, when the consumption of the collector is 1.9kg/t, the recovery rate of the clean coal combustible substance is 88.88%, the ash content of the clean coal is 10.82%, the flotation index is obviously superior to the index when the consumption of the diesel oil is 7.0kg/t, the recovery rate of the combustible substance is 83.82%, and the ash content of the clean coal is 11.78%. In example 2, when the consumption of the collecting agent is 0.5kg/t, the recovery rate of the clean coal combustible substance reaches 84.24%, the ash content of the clean coal is 10.01%, and the flotation index is equivalent to that when the consumption of the diesel oil is 7.0 kg/t.
Example 3:
coal slime property: the coal slurry is derived from Shendong long flame coal, the ash content of the fed coal slurry is 13 percent, and the-0.074 mm particle size accounts for 70 percent.
The operating conditions are as follows: A1.5L XFD type slot-hanging flotation machine is adopted, and the rotating speed of a main shaft is 2000 rpm. Weighing 120g of dry coal slime, pouring the dry coal slime into a flotation tank filled with tap water to prepare flotation pulp (the pulp concentration is 80g/L), adding a collecting agent, stirring for 3min, adding a foaming agent, namely octanol, stirring for 30s, and introducing gas (the aeration quantity is 0.25 m)3Blowing for 3min after the reaction is finished, wherein the blown foam and the residue at the bottom of the tank areAnd (4) floating clean coal and floating tail coal, respectively filtering, drying and weighing, and calculating to obtain the combustible body recovery rate of the product. The flotation comparison results of the agent of the present invention and the common collector diesel are shown in table 4.
In example 3, the flotation collector is prepared from 75% of diesel oil, 9% of n-caprylic acid, 7% of butyl benzoate and 9% of n-butyl ether by mass. The preparation process comprises the following steps: mixing diesel oil, n-caprylic acid, butyl benzoate and n-butyl ether in proportion, and stirring at the speed of 1000rpm for 20min to obtain the flotation collector.
Table 4 example 3 diesel flotation index comparison of collector to common collector (shendong long flame coal)
As can be seen from Table 4, in example 3, when the consumption of the collector is 2.0kg/t, the recovery rate of the clean coal combustible substance is 87.76%, the ash content of the clean coal is 4.93%, the flotation index is obviously superior to the index when the consumption of the diesel oil is 10.0kg/t, the recovery rate of the combustible substance is 72.87%, and the ash content of the clean coal is 5.74%. The agent can realize high-efficiency separation of low-rank coal slime at low consumption.
In conclusion, the collecting agent disclosed by the invention is few in components and high in flotation efficiency, solves the problems of high drug consumption, high cost and poor operability of the conventional flotation method, reduces the cost, has great significance for reducing coal pollution and improving economic efficiency of coal enterprises, and has wide application prospects.
It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (16)
1. The low-rank coal slime flotation collector compounded with acid ester ether is characterized by comprising the following components in percentage by mass:
C10-C1660-85% of hydrocarbon oil;
C6-C85 to 15 percent of acid;
C10-C185 to 15 percent of ester;
5 to 15 percent of ether, wherein the ether is C4-C10Or n-octyl ether.
2. The low-rank coal slime flotation collector according to claim 1, wherein the collector consists of the following components in percentage by mass:
C10-C1670-80% of hydrocarbon oil;
C6-C87-12% of acid;
C10-C185-8% of ester;
C4-C108 to 10 percent of ether or n-octyl ether.
3. The low-rank coal slurry flotation collector of claim 2, wherein C is10-C16The mass percent of the hydrocarbon oil is 75-80%.
4. The low-rank coal slurry flotation collector according to claim 1, wherein the coal slurry flotation collector consists of the following components in percentage by mass: c10-C16Hydrocarbon oil 70%, C6-C8Acid 12%, C10-C18Ester 8%, C4-C10Ether or n-octyl ether account for 10%;
or, C10-C1680% of hydrocarbon oil, C6-C8Acid 7%, C10-C18Ester content 5%, C4-C10Ether or n-octyl ether 8%;
or, C10-C1675% of hydrocarbon oil, C6-C8Acid 10%, C10-C18Ester 7% by weight, C4-C10Ether or n-octyl ether accounted for 8%.
5. The low-rank coal slurry flotation collector according to any one of claims 1 to 4, wherein the hydrocarbon oil is selected from at least one of diesel oil or kerosene.
6. The low-rank coal slurry flotation collector according to any one of claims 1 to 4, wherein the acid is selected from at least one of n-octanoic acid or a homologue thereof.
7. The low-rank coal slurry flotation collector of claim 6, wherein the acid is at least one of n-octanoic acid and n-hexanoic acid.
8. The low-rank coal slurry flotation collector according to any one of claims 1 to 4, wherein the ester comprises at least one of butyl benzoate or a homologue thereof.
9. The low-rank coal slime flotation collector according to any one of claims 1 to 4, wherein the C is4-C10The ether includes at least one of n-pentyl ether or a homologue thereof.
10. The low-rank coal slurry flotation collector of claim 9, wherein C is4-C10The ether is at least one of n-amyl ether and n-butyl ether.
11. The low-order coal slime flotation collector of any one of claims 1 to 4, wherein the hydrocarbon oil is diesel oil and/or kerosene, the acid is at least one of n-octanoic acid or n-hexanoic acid, the ester is at least one of butyl benzoate or a homologue thereof, and the ether is at least one of n-pentyl ether or n-butyl ether.
12. The preparation method of the low-rank coal slime flotation collector compounded with the acid ester ether according to any one of claims 1 to 11, is characterized by comprising the following steps:
and mixing the hydrocarbon oil with acid, ester and ether to obtain the collector.
13. A preparation method according to claim 12, characterized in that acid, ester and ether are added into hydrocarbon oil and stirred for more than 15min to obtain the collector.
14. The method of claim 13, wherein the stirring time is 15-25 min.
15. Use of the collector according to any one of claims 1 to 11 or the collector produced by the method of preparation according to claim 12 in flotation of coal slurry, characterised in that it comprises the steps of:
preparing coal slime into flotation pulp, adding the collecting agent and the foaming agent into the flotation pulp, stirring the mixture, and feeding the mixture into flotation equipment for separation to obtain flotation concentrate and flotation tailings.
16. Use according to claim 15, characterized in that the concentration of the flotation pulp is 60-100 g/L;
the consumption of coal slime per ton of the collecting agent is 0.5-2.8kg/t, and the consumption of coal slime per ton of the foaming agent is 0.1-0.5 kg/t;
the blowing agent includes at least one of sec-octanol or fusel alcohol.
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| CN101722111B (en) * | 2010-01-11 | 2012-11-28 | 山西医科大学 | Coal slime flotation collector and preparation method thereof |
| CN103056033B (en) * | 2013-01-25 | 2014-05-14 | 山东科技大学 | Coal slime microemulsion collecting agent and preparation method thereof |
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