CN115069226B - Modified steel slag adsorbent and preparation method and application thereof - Google Patents
Modified steel slag adsorbent and preparation method and application thereof Download PDFInfo
- Publication number
- CN115069226B CN115069226B CN202210519004.5A CN202210519004A CN115069226B CN 115069226 B CN115069226 B CN 115069226B CN 202210519004 A CN202210519004 A CN 202210519004A CN 115069226 B CN115069226 B CN 115069226B
- Authority
- CN
- China
- Prior art keywords
- steel slag
- adsorbent
- modified
- sio
- modified steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 137
- 239000010959 steel Substances 0.000 title claims abstract description 137
- 239000002893 slag Substances 0.000 title claims abstract description 136
- 239000003463 adsorbent Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 229920002873 Polyethylenimine Polymers 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 21
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002105 nanoparticle Substances 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010306 acid treatment Methods 0.000 claims abstract description 3
- 238000001035 drying Methods 0.000 claims description 32
- 238000001179 sorption measurement Methods 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000005554 pickling Methods 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 11
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 238000012216 screening Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 239000013335 mesoporous material Substances 0.000 description 1
- 239000002366 mineral element Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a modified steel slag adsorbent, a preparation method and application thereof, wherein the modified steel slag adsorbent is a substrate material of polyethylene imine modified steel slag, and the surface of the substrate material is provided with porous SiO 2 Nano hydrophobic coating, noted SiO 2 PEIx-Salg, wherein PEI is polyethyleneimine, x is the mass percent of polyethyleneimine in steel slag, x=10-30, and Salg represents the steel slag after hydrochloric acid treatment. The invention recycles the resource of the steel slag solid waste, the steel slag has the basic characteristics of the adsorbent, and adopts alkaline reagent and hydrophobic SiO 2 The nano particles can be used for modifying the steel slag and preparing CO with water resistance and dust resistance 2 The adsorbent can realize the resource utilization of the steel slag solid waste, realize the purpose of treating waste by waste, and have the significance of environmental protection and resource conservation.
Description
Technical Field
The invention belongs to the technical field of carbon capture, and particularly relates to a modified steel slag adsorbent, and a preparation method and application thereof.
Background
Since the industrial revolution, the combustion of fossil fuels has led to a surge in atmospheric carbon dioxide content from 290PPM before the industrial revolution to 400PPM. Carbon dioxide emissions, in addition to causing global warming, also present a significant environmental challenge.
Billions of tons of industrial solid waste are generated in China each year, and the comprehensive utilization rate is only about 50%. The rest solid wastes are accumulated in a concentrated way, so that not only the land is occupied, but also the problems of water pollution, soil pollution, atmospheric pollution and the like are caused. A large amount of steel slag is inevitably generated in the steelmaking process, and the treatment and the recycling of the steel slag have important significance. Because the steel slag contains a plurality of mineral elements, the steel slag is used for replacing limestone to absorb SO in flue gas 2 . The steel slag has the basic characteristics of an adsorbent, such as large specific surface area and developed pore channels. CO 2 Is acid gas, the alkaline adsorbent has good selectivity and adsorption capacity, however, the flue gas after high-efficiency denitration, dust removal and desulfurization contains 10 percent of water vapor and particulate matters (less than or equal to 5 mg/m) 3 ) And the like, the adsorbent is required to have water resistance and dust deposition resistance.
The patent application with the patent application number of CN201810896849.X discloses a steel slag modification and comprehensive utilization system and method, belongs to the field of solid waste treatment in the metallurgical industry, and solves the technical problems that iron oxide compounds in the steel slag cannot be recovered in a large amount in the existing steel slag treatment process, and steel slag is influenced to serve as a stable building material. The invention provides a steel slag modification and comprehensive utilization system, which comprises a steel slag modification electric furnace, wherein the modification electric furnace comprises a modification electric furnace main body, an electrode, a first spray pipe and a second spray pipe; the first spray pipe and the second spray pipe are of telescopic structures; the first spray pipe sprays reducing agent into the modified electric furnace by using a telescopic structure and compressed gas; the second spray pipe also sprays auxiliary materials into the modified electric furnace by using a telescopic structure. According to the invention, the liquid steel slag is subjected to temperature raising and modification treatment by adopting a modification electric furnace, iron oxides in the liquid steel slag are reduced into molten iron, iron components in the steel slag are recovered, and other auxiliary materials are added according to requirements to properly temper the steel slag, so that the steel slag components are ensured to meet the requirements of subsequent recycling.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a modified steel slag adsorbent, a preparation method and application thereof, which are used for improving the resource utilization of steel slag and solving the problem of CO in the prior art 2 Low adsorption separation efficiency, and the like. The specific technical scheme of the invention is as follows:
a modified steel slag adsorbent is a substrate material of polyethylene imine modified steel slag, and the surface of the substrate material is provided with porous SiO 2 Nano hydrophobic coating, noted SiO 2 PEIx-Salg, wherein PEI is polyethylenimine, x is polyethylenimine in steel slagX=10 to 30, and Salg represents steel slag after hydrochloric acid treatment.
Further, the porous SiO 2 The thickness of the nano hydrophobic coating is 60-80 nm.
A method for preparing a modified steel slag adsorbent, comprising the steps of:
step 1, weighing 20g of steel slag, placing the steel slag in a conical flask, and adding a HC1 solution with the concentration of 30 mL% to carry out pickling;
step 2, carrying out suction filtration on the steel slag after pickling, washing the steel slag with deionized water until the filtrate is neutral, then placing the steel slag in a drying oven for drying, grinding and sieving;
step 3, placing 0.3-0.9g of polyethyleneimine into 30mL ethanol, and magnetically stirring for 15min until the polyethyleneimine is completely dissolved; adding the steel slag obtained in the step 2 of 3g, dipping 6h, and then placing a sample in a drying oven to obtain a polyethylene imine modified steel slag marked as PEIx-Salg, wherein x=10-30;
step 4, taking the polyethyleneimine modified steel slag obtained in the step 3 as a substrate, and spraying hydrophobic SiO (silicon dioxide) 2 Modifying nano particles on a substrate to form porous SiO 2 And (5) obtaining a final product by the nano hydrophobic coating.
The temperature in the drying oven in the step 3 is set to 80 ℃.
In the step 1, the conical flask is fixed in a constant temperature oscillator during pickling, and the oscillating time is 1h.
And (2) screening the steel slag after grinding by using a 40-mesh sieve and a 60-mesh sieve.
The dipping process in the step 3 is carried out under the conditions of stirring and water bath at 50 ℃.
Step 4 hydrophobic SiO before spraying 2 The nano particles are dissolved in gasoline, and SiO is formed along with volatilization of the gasoline 2 The pore diameter of the nanoparticle mesoporous coating structure is 3-5nm; preferably, the volatile gasoline is recovered by condensation for recycling.
Application of modified steel slag adsorbent for CO of dust-containing and water-containing flue gas 2 And (5) adsorption separation.
The invention recycles the resources of the steel slag solid waste, and the utilization of the steel slag has better effectThe high specific surface area and the steel slag have the basic characteristics of an adsorbent, and adopts an alkaline reagent and hydrophobic SiO 2 The nano particles are used for modifying the steel slag, and the alkaline polyethyleneimine is used for modifying the steel slag to prepare low-cost CO 2 Efficient route to adsorbents. Aiming at the characteristic that the actual flue gas generally contains water vapor, trace particulate matters and other impurities, mesoporous SiO is sprayed on the surface of the modified steel slag 2 The nano hydrophobic coating can greatly improve the water resistance and dust deposition resistance of the material. Can be used for preparing CO with water-resistant and dust-resistant performances 2 The adsorbent can realize the resource utilization of the steel slag solid waste, realize the purpose of treating waste by waste, and have the significance of environmental protection and resource conservation.
Drawings
FIG. 1 is a low temperature nitrogen adsorption/desorption isotherm of steel slag and modified steel slag provided in blank examples, examples 1-3 of the present invention;
FIG. 2 is a low temperature nitrogen adsorption/desorption isotherm of the steel slag and modified steel slag provided in blank examples, comparative examples 1-3;
FIG. 3 shows steel slag and modified steel slag CO 2 Adsorption amount, absorption amount and dust absorption amount. a-Salg-raw, b-PEI 10 -Salg;c-PEI 20 -Salg;d-PEI 30 -Salg;e-SiO 2 @PEI 10 -Salg;f-SiO 2 @PEI 20 -Salg; g-SiO 2 @PEI 30 -Salg。
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
Example 1
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven for drying at 80 ℃ overnight, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
then, 0.3g of polyethyleneimine PEI was placed in 30mL ethanol, magneticStirring with force for 15min until the mixture is completely dissolved; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80deg.C overnight to obtain polyethyleneimine modified steel slag marked with PEI 10 -Salg；
Finally, taking the modified steel slag as a substrate, and taking hydrophobic SiO as a substrate 2 The nano particles are dissolved in gasoline and then sprayed on a substrate, and after the gasoline volatilizes, porous SiO is formed 2 Nano hydrophobic coating, sample mark SiO 2 @PEI 10 Salg, recovering the volatilized gasoline by condensation for recycling.
Example 2
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven for drying at 80 ℃ overnight, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
then, 0.6g of Polyethylenimine (PEI) was placed in 30mL ethanol and magnetically stirred for 15min to complete dissolution; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80 ℃ overnight to obtain the polyethyleneimine modified steel slag marked as PEI20-Salg;
finally, taking the modified steel slag as a substrate, and taking hydrophobic SiO as a substrate 2 The nano particles are dissolved in gasoline and then sprayed on a substrate, and after the gasoline volatilizes, porous SiO is formed 2 Nano hydrophobic coating, sample mark SiO 2 @PEI 20 Salg, in which volatile gasoline is recovered by condensation for recycling.
Example 3
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven for drying at 80 ℃ overnight, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
then, 0.9g of polyethyleneimine PEI is placed in 30mL ethanol and magnetically stirred for 15min until the polyethyleneimine PEI is completely dissolved; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80deg.C overnight to obtain polyethyleneimine modified steel slag marked with PEI 30 -Salg；
Finally, taking the modified steel slag as a substrate, and taking hydrophobic SiO as a substrate 2 The nano particles are dissolved in gasoline and then sprayed on a substrate, and after the gasoline volatilizes, porous SiO is formed 2 Nano hydrophobic coating, sample mark SiO 2 @PEI 30 Salg, in which volatile gasoline is recovered by condensation for recycling.
Comparative example 1
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven for drying at 80 ℃ overnight, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
finally, 0.3g of polyethyleneimine PEI is placed in 30mL ethanol and magnetically stirred for 15min until the polyethyleneimine PEI is completely dissolved; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80deg.C overnight to obtain polyethyleneimine modified steel slag marked with PEI 10 -Salg。
Comparative example 2
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven at 80 ℃ overnight for drying, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
finally, 0.6g of polyethyleneimine PEI is placed in 30mL ethanol and magnetically stirred for 15min until the polyethyleneimine PEI is completely dissolved; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80deg.C overnight to obtain polyethyleneimine modified steel slag marked with PEI 20 -Salg。
Comparative example 3
Firstly, weighing 20g of steel slag, placing the steel slag into a conical flask, adding a HC1 solution with the concentration of 30mL being 15%, fixing the conical flask in a constant-temperature oscillator, oscillating and pickling for 1h, and removing easily-soluble substances;
filtering the pickled steel slag, repeatedly washing the steel slag with deionized water for a plurality of times until the filtrate is neutral, then placing the steel slag in a drying oven at 80 ℃ overnight for drying, and screening the steel slag with a 40-mesh and 60-mesh screen for later use after grinding;
finally, 0.9g of polyethyleneimine PEI is placed in 30mL ethanol and magnetically stirred for 15min until the polyethyleneimine PEI is completely dissolved; adding 3g steel slag, and soaking for 6h under stirring and water bath at 50 ℃; placing the sample in a drying oven, and drying at 80deg.C overnight to obtain polyethyleneimine modified steel slag marked with PEI 30 -Salg。
And testing the specific surface area and the pore volume of the steel slag and the modified steel slag by adopting a specific surface area and pore diameter analyzer. Testing material for CO under dry dust-free condition using U-tube adsorber 2 Dynamic adsorption quantity Q1, intake N 2 /CO 2 (15% volume fraction of CO) 2 ) The mixed gas is adsorbed at 60 ℃, the temperature is controlled by water bath, and the CO is detected by gas chromatography 2 Concentration, calculate the adsorption quantity according to the peak area; testing materials for CO under conditions of moisture and particulate matter at the same temperature 2 Dynamic adsorption quantity Q 2 Simulating particles by adopting talcum powder; in addition, the adsorption amount of the material to single components of water vapor and particulate matters at 60 ℃ is tested respectively, and the adsorption amount and the dust absorption amount are calculated by adopting a gravimetric method. The isothermal line of low-temperature nitrogen adsorption and desorption is shown in figures 1-2, and the steel slag and the modified steel slag both show typical characteristicsThe IV type isotherm of the sample and the H2 type hysteresis loop appear, which indicates that the sample is mesoporous material with uniform pore size distribution and the pore structure is ink bottle type. Specific surface area, pore volume, and CO of the adsorbent 2 The adsorption amount, absorption amount and dust absorption amount are shown in Table 1, and the CO of different samples 2 The change law of the adsorption amount, the absorption amount and the dust absorption amount is shown in fig. 3.
TABLE 1 specific surface area, pore volume, CO of adsorbents 2 Adsorption capacity, absorption capacity and dust collection capacity
As can be seen from Table 1, salg-raw has a specific surface area of 284 m 2 Per gram, pore volume of 0.65 and m, respectively 3 /g, CO in dry dust-free condition 2 The adsorption quantity Q1 is 70 mg/g, after PEI modification, the specific surface area and the pore volume of the steel slag are gradually reduced along with the increase of the organic amine load, and CO 2 The adsorption quantity Q1 gradually increases with the increase of the load quantity, and PEI 30 Salg gives a maximum adsorption of 135.1 mg/g; salg-raw and PEI 30 Salg CO under dusty and aqueous conditions 2 The adsorption quantity Q2 was reduced to 48.3 mg/g and 98.4mg/g, respectively. After PEI modification, the water absorption and dust absorption of the steel slag are increased along with the increase of amine load, and the water resistance and dust resistance of the amine modified steel slag are reduced due to the hydrophilicity and adhesiveness of PEI.
Compared with PEIx-Salg, porous SiO is adopted 2 Sample SiO modified by nano hydrophobic coating 2 CO @ PEIx-Salg 2 The adsorption quantity Q1 is slightly reduced, and CO 2 The adsorption quantity Q2 is obviously improved, and at the same time, the water absorption quantity and the dust collection quantity are greatly reduced. It can be seen from this that SiO 2 The @ PEIx-Salg adsorbent has good water resistance and dust resistance, and is suitable for CO under complex working conditions 2 And (5) adsorption separation.
Claims (8)
1. A modified steel slag adsorbent is characterized in that polyethylene imine modified steel slag is used as a base material, and the surface of the base material is provided with a porous SiO 2 Nano hydrophobic coating, noted SiO 2 PEIx-Salg, wherein PEI is polyethylenimine, x is the mass percent of polyethylenimine in steel slag, x=10-30, salg represents steel slag after hydrochloric acid treatment, and the porous SiO 2 The thickness of the nano hydrophobic coating is 60-80nm, and the method for preparing the modified steel slag adsorbent comprises the following steps:
step 1, weighing 20g of steel slag, placing the steel slag into a conical flask, and adding 30mL of HC1 solution with the concentration of 15% for pickling;
step 2, carrying out suction filtration on the steel slag after pickling, washing the steel slag with deionized water until the filtrate is neutral, then placing the steel slag in a drying oven for drying, grinding and sieving;
step 3, placing 0.3-0.9g of polyethyleneimine into 30mL of ethanol, and magnetically stirring for 15min until the polyethyleneimine is completely dissolved; 3g of the steel slag obtained in the step 2 is added, immersed for 6 hours, and then the sample is placed in a drying oven to obtain the polyethylene imine modified steel slag marked as PEIx-Salg, wherein x=10-30;
step 4, taking the polyethyleneimine modified steel slag obtained in the step 3 as a substrate, and spraying hydrophobic SiO (silicon dioxide) 2 Modifying nano particles on a substrate to form porous SiO 2 And (5) obtaining a final product by the nano hydrophobic coating.
2. The modified steel slag adsorbent of claim 1, wherein the temperature in the drying oven in step 3 is set to 80 ℃.
3. The modified steel slag adsorbent of claim 1, wherein the conical flask is fixed in a constant temperature oscillator during pickling in step 1, and the oscillation time is 1h.
4. The modified steel slag adsorbent of claim 1, wherein the steel slag is ground in step 2 and then screened with 40 mesh and 60 mesh screens.
5. The modified steel slag adsorbent of claim 1, wherein the impregnating process in step 3 is performed under stirring in a water bath at 50 ℃.
6. The modified steel slag adsorbent of claim 1, wherein the hydrophobic SiO is added prior to spraying in step 4 2 The nano particles are dissolved in gasoline, and SiO is formed along with volatilization of the gasoline 2 The mesoporous coating structure of the nanometer particle has pore diameter of 3-5nm.
7. The modified steel slag adsorbent of claim 6, wherein the vaporized gasoline is recovered by condensation for recycling.
8. Use of the modified steel slag adsorbent of claim 1 for CO in flue gas containing dust and water 2 And (5) adsorption separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519004.5A CN115069226B (en) | 2022-05-13 | 2022-05-13 | Modified steel slag adsorbent and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519004.5A CN115069226B (en) | 2022-05-13 | 2022-05-13 | Modified steel slag adsorbent and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115069226A CN115069226A (en) | 2022-09-20 |
| CN115069226B true CN115069226B (en) | 2024-03-08 |
Family
ID=83247338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210519004.5A Active CN115069226B (en) | 2022-05-13 | 2022-05-13 | Modified steel slag adsorbent and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115069226B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115738955A (en) * | 2022-10-25 | 2023-03-07 | 苏州大学 | Wood-based flow type reactor and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102614833A (en) * | 2012-04-13 | 2012-08-01 | 浙江大学 | Modified titanium nanotube absorbent for absorbing carbon dioxide and preparation method and application thereof |
| CN107029660A (en) * | 2017-05-26 | 2017-08-11 | 中国矿业大学 | A kind of high temperature CO2The method of preparation and use of modified calcium-based adsorbent |
| CN108262016A (en) * | 2018-03-23 | 2018-07-10 | 宁波大学 | A kind of method of slag adsorbing and removing carbon dioxide in gas |
| CN113003584A (en) * | 2021-03-26 | 2021-06-22 | 东北大学 | Method for preparing mesoporous silicon-aluminum material by using steel slag |
| CN113713768A (en) * | 2021-09-07 | 2021-11-30 | 盐城工学院 | High-temperature-resistant activated carbon composite adsorbent and preparation method and application thereof |
| CN114130350A (en) * | 2021-12-20 | 2022-03-04 | 中国科学院过程工程研究所 | CO based on multi-source solid waste modification2Adsorbent and preparation method and application thereof |
-
2022
- 2022-05-13 CN CN202210519004.5A patent/CN115069226B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102614833A (en) * | 2012-04-13 | 2012-08-01 | 浙江大学 | Modified titanium nanotube absorbent for absorbing carbon dioxide and preparation method and application thereof |
| CN107029660A (en) * | 2017-05-26 | 2017-08-11 | 中国矿业大学 | A kind of high temperature CO2The method of preparation and use of modified calcium-based adsorbent |
| CN108262016A (en) * | 2018-03-23 | 2018-07-10 | 宁波大学 | A kind of method of slag adsorbing and removing carbon dioxide in gas |
| CN113003584A (en) * | 2021-03-26 | 2021-06-22 | 东北大学 | Method for preparing mesoporous silicon-aluminum material by using steel slag |
| CN113713768A (en) * | 2021-09-07 | 2021-11-30 | 盐城工学院 | High-temperature-resistant activated carbon composite adsorbent and preparation method and application thereof |
| CN114130350A (en) * | 2021-12-20 | 2022-03-04 | 中国科学院过程工程研究所 | CO based on multi-source solid waste modification2Adsorbent and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| Jiupeng Zhang et al.,.Preparation of mesoporous coal-gasification fine slag adsorbent via amine modification and applications in CO2 capture.Applied Surface Science.2020,第537卷第2.2节和表1. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115069226A (en) | 2022-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11420183B2 (en) | Method of preparing carbon-based sulfur-loading iron-containing adsorbent for mercury removal | |
| CN103785349B (en) | Preparation method of solid amine gas adsorption material | |
| CN115069226B (en) | Modified steel slag adsorbent and preparation method and application thereof | |
| CN106693882B (en) | Coal-fired power plant flue gas demercuration adsorbent and preparation method thereof | |
| CN109706549A (en) | A kind of preparation method and application of NEW TYPE OF COMPOSITE boron nitride adsorbent material | |
| CN113499778B (en) | High-temperature flue gas denitration catalyst for coal gas slag cement kiln and preparation method of high-temperature flue gas denitration catalyst | |
| CN103143322A (en) | Preparation method of modified active carbon-based gasoline desulfurization adsorbent | |
| CN106732347B (en) | A kind of preparation method for coal-fired plant flue gas demercuration SBA-15 base load silver adsorbent | |
| CN114405474A (en) | Preparation method of gasification slag-based solid amine carbon dioxide adsorbent | |
| CN113713630A (en) | Composite membrane synthesis method for adsorbing gaseous mercury and composite membrane | |
| CN110115975A (en) | Modified carbon nitride adsorbent of a kind of manganese oxide and the preparation method and application thereof | |
| CN112516968A (en) | Preparation method of metal organic framework material loaded modified diatomite adsorbent | |
| CN114213140B (en) | Coal gangue-based ceramsite for phosphorus adsorption, preparation method thereof and water treatment equipment | |
| CN111871361A (en) | Environment repairing material and preparation method and application thereof | |
| CN113663416A (en) | Load type PTFE fiber filter material and preparation method thereof | |
| CN103331140B (en) | Demercuration adsorbent and preparation method thereof | |
| CN110575812B (en) | Environment-friendly adsorbing material for efficient phosphorus removal of argil/pyrolusite and preparation method thereof | |
| CN102580674B (en) | Method for preparing mercury removal agent by utilizing modified waste tire pyrolysis residue | |
| CN116637636A (en) | Method for preparing manganese-based low-temperature SCR catalyst by using waste FCC catalyst | |
| CN116673028A (en) | Catalyst for purifying flue gas of rubber asphalt and preparation method thereof | |
| CN115193395A (en) | Preparation method and application of mercury removal adsorbent compounded by pyrite and modified fly ash | |
| CN116059957A (en) | Catalytic adsorbent for flue gas mercury removal and denitration, preparation method and application thereof, and treatment method of flue gas of coal-fired power plant | |
| CN107377008A (en) | One kind carries palladium fiber base catalyst and its production and use | |
| Rani et al. | Coal bottom ash as a potential adsorbent for CO2 capture | |
| CN110013826A (en) | The preparation method and application of aluminium pillared montmorillonite load K-Nb or Mg-Nb compound adsorbent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |