CN114769007B - Method for preparing low-rank coal flotation reagent by compounding-modifying - Google Patents
Method for preparing low-rank coal flotation reagent by compounding-modifying Download PDFInfo
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- CN114769007B CN114769007B CN202210220034.6A CN202210220034A CN114769007B CN 114769007 B CN114769007 B CN 114769007B CN 202210220034 A CN202210220034 A CN 202210220034A CN 114769007 B CN114769007 B CN 114769007B
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- 239000003245 coal Substances 0.000 title claims abstract description 77
- 238000005188 flotation Methods 0.000 title claims abstract description 46
- 239000003153 chemical reaction reagent Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000004088 foaming agent Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000009832 plasma treatment Methods 0.000 claims abstract description 7
- 239000006260 foam Substances 0.000 claims abstract description 6
- 238000007790 scraping Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000005273 aeration Methods 0.000 claims abstract description 3
- 239000003814 drug Substances 0.000 claims description 18
- 239000004215 Carbon black (E152) Substances 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 125000003158 alcohol group Chemical group 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 150000001335 aliphatic alkanes Chemical class 0.000 abstract description 6
- 239000008396 flotation agent Substances 0.000 abstract description 4
- 238000005187 foaming Methods 0.000 abstract description 4
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 150000001298 alcohols Chemical class 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract 1
- 239000003350 kerosene Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 6
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000007 visual effect Effects 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
-
- 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
Landscapes
- Physical Water Treatments (AREA)
Abstract
The invention discloses a method for preparing a low-order coal flotation reagent by compounding and modifying, which comprises the steps of fully and uniformly mixing a collecting agent and a foaming agent according to a mass ratio of 1, obtaining the reagent 1 after low-temperature plasma treatment, and continuously stirring pulp after pulp mixing. Uniformly mixing the collecting agent and the foaming agent according to the mass ratio of 2, then carrying out plasma treatment to obtain a reagent 2, feeding ore pulp again, continuously stirring, and starting aeration and foam scraping to obtain refined coal and tail coal. The agent 1 prepared by the process contains rich short-chain alkane, short-chain alkane oxide and modified special long-chain alkane oxide, and the collection performance of low-rank coal is improved; the agent 2 contains a large amount of alcohols and modified long-chain alcohols, and has a strong interaction with the coal particles to which the agent 1 is adsorbed. The agents 1 and 2 realize the synergy of various polar functional groups, are beneficial to strengthening the collecting performance and the foaming performance of the agents, improve the flotation selectivity and effectively reduce the dosage of the flotation agents.
Description
Technical Field
The invention relates to the field of coal slime flotation, and provides a method for preparing a low-rank coal flotation reagent by compounding-modifying, aiming at the problems of weak collection capacity and high reagent dosage when low-rank coal is subjected to flotation by a conventional flotation reagent.
Background
The reserve of low-rank coal resources in China is large, the proportion of the low-rank coal resources in the coal resource distribution reaches 57%, and the development and utilization of the enhanced low-rank coal are significant for relieving energy shortage and realizing full utilization of energy. And the quality of the coal slime can be further improved when the low-rank coal slime is recycled through flotation, the heating value of the coal slime is finally improved, and the influence of the back doped coal slime on main products is reduced. Therefore, research on the efficient low-rank coal slime flotation technology is an important way for improving the resource utilization of the low-rank coal slime.
Compared with Gao Jiemei, the low-rank coal has larger pores and more pores, the surface of the low-rank coal is in a rough state, and the surface of the low-rank coal has more oxygen-containing functional groups, so that the conventional collector is difficult to adsorb on the surface of the low-rank coal, and under the condition that the yield of the clean coal is similar, the consumption of the conventional collector is obviously increased, and the flotation is not easy to effectively carry out.
In order to effectively solve the problem that low-rank coal is difficult to float, scientific researchers compound oxygen-containing components with a conventional hydrocarbon oil collector so as to enhance the surface hydrophobicity of coal slime. And by taking the technical thought, various compound medicaments and special heteropolar medicaments are developed. The preparation method is mainly physical mixing, so that ideal flotation results are achieved, and the raw materials selected by the compound medicament have high universal cost. The development and research of preparing heteropolar medicaments by using conventional medicaments are receiving more and more attention by introducing plasma technology into mineral processing. Besides, the foaming agent is used as a key factor of flotation stability, relatively few researches are carried out, the adhesion efficiency of the foaming agent is mainly enhanced by an emulsifying mode, and the modification of the foaming agent is also very significant for improving the flotation recovery efficiency of low-rank coal.
At present, the flotation reagent method for plasma treatment is a single conventional collector. According to the device for preparing the low-rank coal slime heteropolarity collector by modifying hydrocarbon oil disclosed in China patent 201820088348.4, when the plasma treatment device is used for modifying dodecane flotation low-rank coal, polar functional groups can be introduced to improve the recovery rate of combustible bodies; the effect of treating a conventional hydrocarbon oil collector by using plasma is remarkable in China patent 201810043147.7; chinese patent 201910788432.6 mentions that the adoption of a single hydrocarbon oil collector in a plasma activated aqueous solution can also improve the hydrophilicity of the coal surface and the adsorption capacity of the agent. However, the dosage of the modified flotation reagent reaches more than 7.5kg/t, and the modified flotation reagent is not easy to be practically applied. In general, a single hydrocarbon oil collector treated by plasma can incorporate a heteropolar component, thereby effectively improving the separation efficiency. However, in order to further reduce the amount of the flotation reagent, further investigation is necessary.
Disclosure of Invention
In view of the analysis, the invention provides a method for preparing a low-rank coal flotation reagent by compounding-modifying, wherein the technical method comprises the steps of mixing a collector foaming agent according to different proportions, modifying the reagent by a plasma generating device, and solving the technical problems of strong hydrophilicity and difficult flotation of the low-rank coal; solves the technical problem of large consumption of low-rank coal flotation agents, and reduces the flotation cost.
A method for preparing a low-rank coal flotation reagent by compounding and modifying comprises the steps of preparing a collecting agent and a foaming agent in different proportions, respectively feeding the collecting agent and the foaming agent into a low-temperature air plasma device for treatment to obtain a reagent 1 and a reagent 2, adding the reagent 1 firstly, stirring, adding the reagent 2, and carrying out aeration and foam scraping to obtain clean coal and tail coal.
Further, the collector is short-chain hydrocarbon oil (C 10～C16), and the foamer is alcohol organic matter (C 5～C8).
Further, the configuration ratio of the collector to the foaming agent is two, the mass ratio 1 is 15% -25% of the mass ratio of the collector to the foaming agent, and the mass ratio 2 in the step b is 75% -85% of the mass ratio of the collector to the foaming agent.
Further, the low-temperature plasma generating device is dielectric barrier discharge; the low-temperature air plasma treatment time is 6-10min.
Further, the reagent 1 is added 2min after the low-order coal mine slurry is mixed, the reagent 2 is added after the stirring time is 2min, and the clean coal and the tail coal are obtained after the stirring for 1min and the inflatable foam scraping.
Further, the particle size of the coal slime is less than or equal to 0.5mm; the concentration of the ore pulp is 50g/l; the total dosage of the medicament 1 and the medicament 2 is 2-4kg, and the dosage of the medicament is calculated by the dosage of each ton of dry coal slime.
The beneficial effects are that: the plasma treated agent 1 produces an oxide of a short-chain alkane and a long-chain alkane oxide peculiar to the modified product, while retaining a part of the short-chain alkane. The generation of various polar chemical components promotes the medicament 1 to have good modification effect on the surface of the low-rank coal, and the existence of long-chain organic matters strengthens the medicament collecting performance to a certain extent, thereby effectively improving the surface hydrophobicity of the coal slime. The plasma treatment agent 2 contains various short-chain alcohol substances and special long-chain alcohols, so that the foaming performance of the agent is effectively improved. Under the interaction of multiple polar functional groups, the agents 1 and 2 have strong collecting performance and foaming performance, so that the dosage of flotation agents can be effectively reduced on the premise of ensuring the yield of clean coal, and the flotation cost is saved.
The invention provides a method for preparing a low-order coal flotation reagent by compounding and modifying, which modifies two compounded reagents to prepare a heteropolarity flotation reagent, so that not only is the hydrophobicity of coal slime self improved, but also the foaming performance of the reagent is enhanced, and the consumption of the low-order coal flotation reagent is effectively reduced.
Drawings
Fig. 1 is a flotation flow chart.
Detailed Description
The invention relates to the field of low-rank coal flotation, and provides a method for preparing a low-rank coal flotation reagent by compounding-modifying, aiming at the problems of high consumption of the reagent and weak collection capacity of the low-rank coal during flotation. The specific implementation mode is as follows:
for the application of the conventional collecting agent and foaming agent provided by the invention, kerosene and sec-octanol are selected and mixed according to a certain proportion to obtain two compound agents. 15-25% of the proportion 1 is selected, the agent 1 is obtained after the low-temperature plasma generating device is used for modification, 75-85% of the proportion 2 is selected, the agent 2 is obtained after the low-temperature plasma generating device is used for modification, ore pulp is fed into the agent 1 after flotation and size mixing are carried out for 2min, the agent 2 is fed into the agent after continuous stirring is carried out for 2min, and the clean coal and the tail coal are obtained after the agent is stirred for 1min and inflatable and foam scraping are carried out. The low-rank coal test coal sample is derived from Shendong long flame coal, ash content is 20.44%, and coal slime with particle size less than or equal to 0.5mm is taken for coal sample flotation test.
In order to facilitate understanding of the technical method of the present invention, a technical solution of the present invention will now be described by way of specific examples with reference to the accompanying drawings. It should be noted that the embodiments described herein are only some embodiments of the present invention, and not all the implementation manners of the present invention, and are only intended to provide the public with a more visual and clear way to understand the present invention, and not to limit the technical solutions described in the present invention. All other embodiments, and other simple alternatives and variations of the inventive solution, which would occur to a person skilled in the art without departing from the inventive concept, are within the scope of the invention.
Example 1
In example 1, the mass ratio of kerosene to octanol in the preparation raw material of the medicament 1 was 20%, and the mass ratio of kerosene to octanol in the preparation raw material of the medicament 2 was 80%.
Example 2
Example 2 is similar to example 1 except that the mass ratio of kerosene to sec-octanol in the preparation of agent 1 was 25% and the mass ratio of kerosene to sec-octanol in the preparation of agent 2 was 75%.
Comparative example 1
Comparative example 1 kerosene was used directly as collector and sec-octanol as foamer.
Comparative example 2
Comparative example 2 is a method for flotation of low rank coal from plasma treated hydrocarbon oil according to chinese patent 201810043147.7, i.e. using plasma modified kerosene as collector and also using plasma modified sec-octanol as frother.
Table 1 comparison of flotation indicators for examples and comparative examples
As is clear from Table 1, in this example 1, under the conditions of 1.8kg/t of kerosene and 0.6kg/t of sec-octanol, the yield of clean coal reached 70.68%, the ash content of clean coal was 5.49%, and the flotation effect was similar to that of the conventional flotation comparative example 1, but the amount of flotation agent was saved by more than 10 kg/t. The dosage of the flotation reagent in the embodiment 2 is integrally close to that in the embodiment 1, the yield of the clean coal is over 70 percent, and the flotation effect is stable. According to comparative example 2, under the conditions that the consumption of kerosene is 2.1 kg/t and the consumption of secondary octanol is 0.6kg/t, the yield of clean coal is 59.45 percent, which is 15 percent lower than that of clean coal of example 2, and comparative examples 1 and 2 find that the compound-modified medicament adopted by the invention effectively improves the flotation effect of low-rank coal and simultaneously effectively saves the consumption of flotation medicament.
Claims (4)
1. A method for preparing a low-rank coal flotation reagent by compounding-modifying is characterized by comprising the following steps: the method comprises the following steps:
a. uniformly mixing a collecting agent and a foaming agent according to a mass ratio of 1, and modifying the mixture by a low-temperature plasma generating device to obtain a medicament 1;
b. uniformly mixing a collecting agent and a foaming agent according to a mass ratio of 2, and processing the mixture by a low-temperature plasma generating device to obtain a reagent 2;
c. firstly, adding the reagent 1 into the low-rank coal slime pulp after size mixing, stirring for a certain time, then adding the reagent 2, and obtaining clean coal and tail coal after aeration and foam scraping;
the collector is a short chain hydrocarbon oil (C 10~C16);
The foaming agent is an alcohol organic matter (C 5~C8);
In the step a, the mass ratio 1 is 15% -25% of the mass ratio of the collecting agent to the foaming agent;
in the step b, the mass ratio 2 is 75% -85% of the mass ratio of the collecting agent to the foaming agent.
2. The method for preparing the low-rank coal flotation reagent by compounding-modifying according to claim 1, which is characterized in that: the low-temperature plasma generating device is dielectric barrier discharge; the low-temperature air plasma treatment time is 6-10min.
3. The method for preparing the low-rank coal flotation reagent by compounding-modifying according to claim 1, which is characterized in that: adding the reagent 12 min after the low-rank coal flotation slurry mixing, adding the reagent 2 after stirring for 2min, and stirring for 1min to obtain the clean coal and the tail coal after inflatable foam scraping.
4. The method for preparing the low-rank coal flotation reagent by compounding-modifying according to claim 1, which is characterized in that: the particle size of the coal slime is less than or equal to 0.5mm; the concentration of the ore pulp is 50g/l; the total dosage of the medicament 1 and the medicament 2 is 2-4kg, and the dosage of the medicament is calculated by the dosage of each ton of dry coal slime.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210220034.6A CN114769007B (en) | 2022-03-08 | 2022-03-08 | Method for preparing low-rank coal flotation reagent by compounding-modifying |
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| CN114769007B true CN114769007B (en) | 2024-05-28 |
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