CN116283019A - Preparation method of waste aggregate of microorganism synergistic mineralization enhancer mixing station - Google Patents
Preparation method of waste aggregate of microorganism synergistic mineralization enhancer mixing station Download PDFInfo
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- CN116283019A CN116283019A CN202310195105.6A CN202310195105A CN116283019A CN 116283019 A CN116283019 A CN 116283019A CN 202310195105 A CN202310195105 A CN 202310195105A CN 116283019 A CN116283019 A CN 116283019A
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- 238000002156 mixing Methods 0.000 title claims abstract description 57
- 239000002699 waste material Substances 0.000 title claims abstract description 40
- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 21
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 20
- 239000003623 enhancer Substances 0.000 title claims abstract description 19
- 244000005700 microbiome Species 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 65
- 238000003756 stirring Methods 0.000 claims abstract description 53
- 239000010812 mixed waste Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 150000001875 compounds Chemical class 0.000 claims abstract description 25
- 230000001580 bacterial effect Effects 0.000 claims abstract description 21
- 244000063299 Bacillus subtilis Species 0.000 claims abstract description 20
- 235000014469 Bacillus subtilis Nutrition 0.000 claims abstract description 20
- 239000011265 semifinished product Substances 0.000 claims abstract description 20
- 239000011575 calcium Substances 0.000 claims abstract description 19
- 239000002910 solid waste Substances 0.000 claims abstract description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004202 carbamide Substances 0.000 claims abstract description 15
- 239000002738 chelating agent Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000012216 screening Methods 0.000 claims abstract description 12
- 238000009718 spray deposition Methods 0.000 claims abstract description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000011259 mixed solution Substances 0.000 claims abstract description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 4
- 239000011707 mineral Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 235000015097 nutrients Nutrition 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 230000000813 microbial effect Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 4
- 239000001963 growth medium Substances 0.000 claims description 4
- 239000001888 Peptone Substances 0.000 claims description 3
- 108010080698 Peptones Proteins 0.000 claims description 3
- 235000013372 meat Nutrition 0.000 claims description 3
- 235000019319 peptone Nutrition 0.000 claims description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 2
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims description 2
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 239000008139 complexing agent Substances 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000009776 industrial production Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 11
- 239000007789 gas Substances 0.000 description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 14
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000002255 enzymatic effect Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 108010046334 Urease Proteins 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- -1 ammonium ions Chemical class 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006911 enzymatic reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A preparation method of waste aggregate of a microorganism synergistic mineralization enhancer mixing station comprises the following steps: step one, immersing commercial mixed waste aggregate in a mixed solution of 10-20 parts by mass of urea, 2-5 parts by mass of ammonia water and 100 parts by mass of water for 10-30 min, and screening to obtain aggregate A; step two, fully mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder according to the mass part of 1:2-2:1 to obtain compound micro powder; step three, uniformly mixing 10 to 30 parts by mass of compound micro powder, 100 parts by mass of aggregate A and 2 to 5 parts by mass of chemical chelating agent, pouring into stirring equipment for stirring, carrying out bacillus subtilis bacterial liquid spray forming treatment on the mixture in the stirring equipment, and simultaneously injecting CO into the mixture in the stirring equipment at a gas speed of 1.0 to 2.0L/min 2 And (3) stirring the gas for a period of time to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixed recycled aggregate. The invention improves the water absorption and crushing value of the recycled aggregate and realizes CO 2 Is sealed and stored by minerals.
Description
Technical Field
The invention belongs to the field of low-carbon sustainability of building materials, and particularly relates to a preparation method of waste aggregate of a microorganism synergistic mineralization enhancer mixing station.
Background
The concrete is a common building material which is prepared by uniformly stirring, compacting, shaping, curing and hardening cementing materials, coarse aggregate, fine aggregate, water, additives and admixture according to a certain proportion. And as the largest material used in the construction industry, the use of the material is gradually increasing and irreplaceable in the present and foreseeable future. The commercial mixing station is used as a preparation place of concrete materials, and a large amount of waste materials of the commercial mixing station are accumulated due to errors of various factors such as proportion, admixture, aggregate grading and the like in the preparation process. The large accumulation of waste from the mixing station not only reduces the area of use of the mixing station, but also is mostly alkaline, resulting in land and river pollution. The problem of stacking waste in a commercial mixing station is urgent and inapplicable.
Although recycled aggregate is widely applied to backfill of road base or subbase, various requirements on grain composition, water absorption and crushing value of the recycled aggregate exist in the technical Specification for construction of road pavement base. The traditional commercial-mixed waste aggregate subjected to mechanical crushing has high water absorption and large crushing value, and various performances cannot meet the standard requirements. The existing methods for reinforcing the recycled concrete aggregate comprise a mechanical reinforcing method, an acid cleaning method, a polymer treatment method and a cement external silica fume treatment method, but the existing methods still have the problems of aggregate damage, additional ion introduction, limited strength improvement and the like.
200810139085.6 Chinese patent discloses recycled aggregate prepared from carbonized and maintained waste, which is prepared by granulating steel slag or cement containing carbonized components as raw materials into balls and then treating by an accelerated carbonization technology. However, the pressurizing curing and the mixing amount of the exciting agent are large, so that the curing cost is high, and the high-temperature curing causes more energy consumption. 201910553299.6A Chinese patent discloses a carbonization reinforced recycled aggregate, a preparation method and application thereof, wherein cement and admixture fine powder are uniformly mixed to be used as an adhesive of the aggregate, and the carbonization reinforced recycled aggregate is obtained after granulation molding, natural pre-curing and carbonization curing. Although the prepared recycled aggregate cylinder has higher pressure intensity, the cement firing energy consumption is larger, the maintenance period is longer, and the industrial popularization is not facilitated. 202110112420.9 Chinese patent discloses a method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete, and the recycled aggregate is strengthened by utilizing denitrifying bacteria mineralization technology, but the technology cost is high, and the bacterial activity is difficult to regulate and control.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a preparation method of waste aggregate of a microorganism synergistic mineralization enhancer mixing station, which strengthens recycled aggregate by using mineralization technology and microorganism enzymatic technology, solves the problem of low mechanical property of the recycled aggregate, improves the water absorption and crushing value of the recycled aggregate, and realizes CO 2 The problems of carbon emission, solid waste accumulation in commercial mixing stations and the like are greatly relieved.
The invention adopts the following technical scheme for solving the problems in the prior art:
a preparation method of waste aggregate of a microorganism synergistic mineralization enhancer mixing station comprises the following steps:
step one, immersing commercial mixed waste aggregate in a mixed solution of 10-20 parts by mass of urea, 2-5 parts by mass of ammonia water and 100 parts by mass of water for 10-30 min, and screening to obtain aggregate A;
step two, fully mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder according to the mass part of 1:2-2:1 to obtain compound micro powder;
and thirdly, uniformly mixing 10-30 parts by mass of compound micro powder, 100 parts by mass of aggregate A and 2-5 parts by mass of chemical chelating agent, pouring into stirring equipment for stirring, carrying out bacillus subtilis bacterial liquid spray forming treatment on the mixture in the stirring equipment, simultaneously injecting CO2 gas into the mixture of the stirring equipment at a gas speed of 1.0-2.0L/min, stirring for a period of time to obtain a semi-finished product, and airing and sealing to obtain the carbon-fixing regenerated aggregate.
Preferably, the concentration of the ammonia water in the first step is 5-10%.
Preferably, the commercial-mixed waste aggregate in the first step is one or a combination of a plurality of waste concrete and waste stone, and the median diameter D 50 <100 μm, pH > 11.
Preferably, the commercial-mixed waste micro powder in the second step is one or a combination of a plurality of cured waste slurry, waste cement, waste mineral powder and waste fly ash, and has a median particle diameter D 50 ＝5～10μm。
Preferably, the calcium-based solid waste micro powder in the second step is one or a combination of more of calcium oxide, calcium hydroxide and calcium bicarbonate, and has a median particle diameter D 50 ＝5～10μm。
Preferably, the chemical chelating agent in the third step is one or a combination of more of an aminocarboxylic complexing agent, ethylenediamine and ethylenediamine tetraacetic acid.
Preferably, the preparation process of the bacillus subtilis bacterial liquid in the step three comprises the steps of culturing bacillus subtilis in a culture medium at 36+/-2 ℃ for 24-48 h, centrifuging at 8000rpm for 15min at 4 ℃ and extracting the bacillus subtilis with the concentration of 10 7 ～10 10 Bacterial cells per ml;
and adding 5-10 parts by mass of bacterial cells and 2-5 parts by mass of nutrient solution into 100 parts by mass of distilled water to prepare the bacillus subtilis bacterial liquid.
Further, the culture medium comprises 3g/L, mnSO of nutrient solution 4 ·H 2 O0.01 g/L, distilled water.
Preferably, the CO introduced in step three 2 CO capture for industrial production 2 The purity is about 20-50%.
Preferably, in the second step, the stirring device is a disc type stirring device, the rotating speed is controlled to be 30-60 r/min, and the stirring time is 12-24 h.
Further, the nutrient solution comprises water, 5.0g/L peptone and 3.0g/L meat extract.
The basic principle of the invention is as follows:
soaking the commercial mixed waste aggregate in a mixed solution of urea and ammonia water, and utilizing the characteristic of high water absorption rate to ensure thatThe mixed solution fills its pores. Spraying and shaping bacillus subtilis bacterial liquid, producing urease by bacteria, hydrolyzing urea in the commercial mixed waste aggregate by the urease, and decomposing the urea into NH 3 And CO 2 (1)。NH 3 Dissolving into water to generate ammonium ions NH 4 + And OH (OH) - (2). At the same time, CO 2 Dissolving in water to produce bicarbonate ions HCO 3 - And hydrogen ions H + (3). Because the pH value of the commercial mixed waste micro powder and the calcium-based solid waste micro powder is more than 11, HCO is caused 3 - With OH - Further reaction to form CO 3 2- (4) And is rich in Ca 2+ 、Mg 2+ Isoalkali metal ions and CO 3 2- The reaction forms carbonate (5). And a compact calcite type calcium carbonate structure is generated in the process of air drying and sealing, so that the water absorption and crushing value of the commercial mixed waste aggregate are obviously reduced.
CO(NH 2 ) 2 +H 2 O→2NH 3 +CO 2 (1)
2NH 3 +2H 2 O→2NH 4 + +2OH - (2)
CO 2 +H 2 O→HCO 3 - +H + (3)
Ca 2+ +CO 3 2- →CaCO 3 ↓(5)
The invention has the following advantages:
(1) The invention provides a preparation method of waste aggregate in a mixing station of a microorganism synergistic mineralization enhancer, which takes commercial mixed waste aggregate as a raw material, and is formed by granulating synergistic commercial mixed waste micro powder and calcium-based solid waste micro powder, wherein on one hand, the particle size of the commercial mixed waste aggregate is increased by utilizing the reactivity and the bonding effect of the micro powder, and on the other hand, the pore cracks of the commercial mixed waste aggregate are filled with micro powder particles and a strong alkali environment is provided for enzymatic reaction of microorganisms.
(2) The invention provides a microorganism synergistic mineralizationCompared with a single technology, the method for preparing the waste aggregate in the enhancer mixing station can promote CO by using mineralization and microbial enzymatic composite technology 2 Dissolving in water and generating a large amount of carbonate, and rapidly preparing the carbon-fixing type recycled aggregate with good grading, water absorption less than 4.5% and crushing value less than 25%.
(3) The invention provides a preparation method of waste aggregate of a microorganism synergistic mineralization enhancer mixing station, which utilizes commercial mixed waste micro powder and calcium-based solid waste micro powder to replace cement as a binder of the commercial mixed waste aggregate, so that on one hand, the energy consumption for producing cement is eliminated, and on the other hand, the utilization rate of industrial solid waste is improved. The method provides a feasible scheme for the treatment of the waste in the commercial mixing station, synchronously realizes the sealing and storage of CO2 minerals and the treatment of the waste in the commercial mixing station, and has good environmental protection and sustainable industrial resources in the commercial mixing station.
Detailed Description
The technical scheme of the invention is further specifically described by the following examples.
Test parameter table
(1) Immersing the commercial mixed waste aggregate in 10 parts by mass of urea: 2 parts by mass of ammonia: 100 parts by mass of water for 10min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 1:2 to obtain the compound micro powder.
(3) 10 parts by mass of compound micro powder: 100 parts by mass of aggregate A:2 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 30r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 1.0L/min 2 And (3) stirring the gas for 18 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 2:
(1) Soaking the commercial mixed waste aggregate in 15 parts by mass of urea: 3 parts by mass of ammonia: 100 parts by mass of water for 20min, and screening to obtain aggregate A.
(2) Mixing commercial waste micro powder and calcium-based solid waste micro powder 1:1, mixing and stirring to obtain the compound micro powder.
(3) Mixing 20 parts by mass of compound micro powder: 100 parts by mass of aggregate A:3 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 1.5L/min 2 And (3) stirring the gas for 16 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 3:
(1) Immersing the commercial mixed waste aggregate in 20 parts by mass of urea: 5 parts by mass of ammonia: 100 parts by mass of water for 30min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 2:1 to obtain the compound micro powder.
(3) Mixing 30 parts by mass of compound micro powder: 100 parts by mass of aggregate A:5 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 60r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 1.5L/min 2 And (3) stirring the gas for 15 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 4:
(1) Immersing the commercial mixed waste aggregate in 10 parts by mass of urea: 3 parts by mass of ammonia: 100 parts by mass of water for 10min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 2:1 to obtain the compound micro powder.
(3) Mixing 20 parts by mass of compound micro powder: 100 parts by mass of aggregate A:3 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 2.0L/min 2 And (3) stirring the gas for 15 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 5:
(1) Soaking the commercial mixed waste aggregate in 15 parts by mass of urea: 2 parts by mass of ammonia: 100 parts by mass of water for 20min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 1:2 to obtain the compound micro powder.
(3) 10 parts by mass of compound micro powder: 100 parts by mass of aggregate A:5 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 30r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 2.0L/min 2 And (3) stirring the gas for 20 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 6:
(1) Immersing the commercial mixed waste aggregate in 10 parts by mass of urea: 3 parts by mass of ammonia: 100 parts by mass of water for 30min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 1:2 to obtain the compound micro powder.
(3) 10 parts by mass of compound micro powder: 100 parts by mass of aggregate A:4 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 1.0L/min 2 And (3) stirring the gas for 18 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Example 7:
(1) Immersing the commercial mixed waste aggregate in 20 parts by mass of urea: 5 parts by mass of ammonia: 100 parts by mass of water for 30min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 1:1 to obtain the compound micro powder.
(3) Mixing 20 parts by mass of compound micro powder: 100 parts by mass of aggregate A:5 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 2.0L/min 2 Stirring for 24 hr to obtain semi-finished product, air drying and sealingObtaining the carbon-fixing type recycled aggregate.
Comparative example 1: without microbiological enzymatic treatment
(1) Immersing the commercial mixed waste aggregate in 3 parts by mass of ammonia water: 100 parts by mass of water for 10min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 2:1 to obtain the compound micro powder.
(3) Mixing 20 parts by mass of compound micro powder: 100 parts by mass of aggregate A:3 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, performing spray forming treatment on bacillus subtilis bacterial liquid, and simultaneously injecting CO at the gas speed of 2.0L/min 2 And (3) stirring the gas for 20 hours to obtain a semi-finished product, and airing and sealing the semi-finished product to obtain the carbon-fixing recycled aggregate.
Comparative example 2: does not undergo carbonization treatment
(1) Immersing the commercial mixed waste aggregate in 10 parts by mass of urea: 100 parts by mass of water for 30min, and screening to obtain aggregate A.
(2) Mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder in a ratio of 1:2 to obtain the compound micro powder.
(3) 10 parts by mass of compound micro powder: 100 parts by mass of aggregate A:4 parts by mass of chemical chelating agent, uniformly mixing, pouring into disc stirring equipment, controlling the rotating speed to be 40r/min, carrying out spray forming treatment on bacillus subtilis bacterial liquid, stirring for 15 hours to obtain a semi-finished product, and airing and sealing to obtain the carbon-fixing recycled aggregate.
The above examples and comparative examples were tested for water absorption and crush values with reference to GB/T14685-2011. The results of the performance tests are shown in Table 1 below.
1.1.1 Table 1 test results
| Water absorption (%) | Crushing value (%) | |
| Example 1 | 4.5 | 24.5 |
| Example 2 | 4.2 | 22.6 |
| Example 3 | 4.4 | 23.7 |
| Example 4 | 4.3 | 23.1 |
| Example 5 | 4.1 | 21.9 |
| Example 6 | 4.2 | 22.7 |
| Example 7 | 4.0 | 21.3 |
| Comparative example 1 | 5.2 | 26.7 |
| Comparative example 2 | 5.4 | 26.4 |
As is clear from the above table, the performance effect of example 7 is optimal, and the soaking time, stirring time, rotation speed and CO of the mixed solution of urea and ammonia water 2 The gas speed and the micro powder mixing amount have larger effect on the performance of the commercial mixing waste aggregate, and the proportion of the compound micro powder has smaller effect on the performance of the commercial mixing waste aggregate. The obtained embodiment carbon-fixing recycled aggregate has good grading, water absorption of less than 4.5 percent and crushing value of less than 25 percent, and meets the requirements of JTG-T3610-2019 highway subgrade construction technical specifications.
Examples 1-7 significantly reduced the water absorption and crush values of the commercially mixed waste aggregates compared to the comparative examples.
The protective scope of the invention is not limited to the embodiments described above, but it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention. It is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The preparation method of the waste aggregate of the microorganism synergistic mineralization enhancer mixing station is characterized by comprising the following steps:
step one, immersing commercial mixed waste aggregate in a mixed solution of 10-20 parts by mass of urea, 2-5 parts by mass of ammonia water and 100 parts by mass of water for 10-30 min, and screening to obtain aggregate A;
step two, fully mixing and stirring the commercial mixed waste micro powder and the calcium-based solid waste micro powder according to the mass part of 1:2-2:1 to obtain compound micro powder;
and thirdly, uniformly mixing 10-30 parts by mass of compound micro powder, 100 parts by mass of aggregate A and 2-5 parts by mass of chemical chelating agent, pouring into stirring equipment for stirring, carrying out bacillus subtilis bacterial liquid spray forming treatment on the mixture in the stirring equipment, simultaneously injecting CO2 gas into the mixture of the stirring equipment at a gas speed of 1.0-2.0L/min, stirring for a period of time to obtain a semi-finished product, and airing and sealing to obtain the carbon-fixing regenerated aggregate.
2. The method for preparing the waste aggregate of the microbial synergistic mineralization enhancer mixing station according to claim 1, wherein the concentration of the ammonia water in the step one is 5-10%.
3. The method for preparing the waste aggregate of the microbial synergistic mineralization enhancer mixing station according to claim 1, wherein in the first step, the waste aggregate is one or a combination of a plurality of waste concrete and waste stone, and the median diameter D 50 <100 μm, pH > 11.
4. The method for preparing the waste aggregate of the microbial synergistic mineralization enhancer mixing station according to claim 1, wherein in the second step, the commercial-mixed waste micro powder is one or a combination of a plurality of solidified waste slurry, waste cement, waste mineral powder and waste fly ash, and has a median particle diameter D 50 ＝5～10μm。
5. The method for preparing the waste aggregate of the mixed station of the microorganism synergistic mineralization enhancer of claim 1, wherein in the second step, the calcium-based solid waste micro powder is one or a combination of more of calcium oxide, calcium hydroxide and calcium bicarbonate, and has a median particle diameter D 50 ＝5～10μm。
6. The method for preparing the waste aggregate of the mixed station of the microorganism synergistic mineralization enhancer, according to claim 1, wherein in the third step, the chemical chelating agent is one or a combination of more of an aminocarboxylic complexing agent, ethylenediamine and ethylenediamine tetraacetic acid.
7. The method for preparing the waste aggregate of the mixed station of the synergistic mineralization enhancer of the microorganism according to claim 1, wherein in the step three, the preparation process of the bacillus subtilis bacterial liquid is that the bacillus subtilis is cultivated in a culture medium with the temperature of 36+/-2 ℃ for 2 DEG C4-48 h, centrifuging at 8000rpm for 15min at 4 ℃ with an extraction concentration of 10 7 ～10 10 Bacterial cells per ml;
adding 5-10 parts by mass of bacterial cells and 2-5 parts by mass of nutrient solution into 100 parts by mass of distilled water to prepare bacillus subtilis liquid, wherein the nutrient solution comprises water, 5.0g/L peptone and 3.0g/L meat extract.
8. The method for preparing the waste aggregate of the mixed station of the microorganism synergistic mineralization enhancer of claim 7, wherein the culture medium comprises 3g/L, mnSO of nutrient solution 4 ·H 2 O0.01 g/L, distilled water, the nutrient solution comprises water, 5.0g/L peptone and 3.0g/L meat extract.
9. The method for preparing the waste aggregate of the mixed station of the microorganism synergistic mineralization enhancer of claim 1, wherein the introduced CO in the third step is as follows 2 CO capture for industrial production 2 The purity is about 20-50%.
10. The method for preparing the waste aggregate of the microbial synergistic mineralization enhancer mixing station according to claim 1, wherein in the second step, the stirring equipment is disc type stirring equipment, the rotating speed is controlled to be 30-60 r/min, and the stirring time is controlled to be 12-24 h.
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