CN111943543A - Method for preparing admixture by modifying steel slag powder through microbial technology - Google Patents
Method for preparing admixture by modifying steel slag powder through microbial technology Download PDFInfo
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- CN111943543A CN111943543A CN202010707858.7A CN202010707858A CN111943543A CN 111943543 A CN111943543 A CN 111943543A CN 202010707858 A CN202010707858 A CN 202010707858A CN 111943543 A CN111943543 A CN 111943543A
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- steel slag
- admixture
- slag powder
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- 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
- C04B40/0042—Powdery mixtures
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for preparing an admixture by modifying steel slag powder by a microbial technology, which comprises the following steps: inoculating bacillus into the sterilized culture medium solution for culture, and centrifuging to prepare concentrated bacterial liquid, or preparing the bacterial liquid into bacterial powder which is recorded as a microbial additive; crushing, magnetically separating and ball-milling the steel slag into steel slag powder; mixing the bacterial powder and the steel slag powder according to the mass ratio of 0.01-0.03 to obtain a mixture, adding water and stirring, wherein the mass ratio of the water to the mixture is 0.15-0.25, or adding the concentrated bacterial liquid into the water and stirring, adding the concentrated bacterial liquid into the steel slag powder and stirring uniformly, wherein the mass ratio of the concentrated bacterial liquid to the steel slag powder is 0.01-0.05; carrying out natural maintenance; then placing the mixture in a curing box for curing; taking out, drying, grinding and sieving to obtain the steel slag admixture finished product. The product of the invention has more excellent properties such as stability, strength and the like.
Description
Technical Field
The invention relates to a preparation method of a building material, in particular to a method for preparing an admixture by modifying steel slag powder by a microbial technology.
Background
At present, the accumulated accumulation amount of the steel slag is huge, the annual discharge amount is gradually increased, but the utilization rate is not high. There is a need to develop a large-scale utilization approach to improve the utilization rate of steel slag resources, increase the utilization amount and realize the negative increase of the total of steel slag increment and stock.
In the past, building materials are one of the most extensive and effective ways for recycling solid wastes. At present, in the period of large-scale infrastructure construction, the concrete has a large number of wide use surfaces, and the steel slag has great absorption potential as an admixture. Two problems are faced when the steel slag powder is prepared into an admixture for concrete. Firstly, stability problems and secondly, activity excitation problems. To solve the problem of stability, the dissolution and conversion of free calcium oxide in the steel slag powder and calcium and magnesium in dead-burned magnesium oxide must be accelerated; the activation depends on the excitation and conversion of a large amount of silicate minerals, especially dicalcium silicate, in the steel slag. However, the conventional technical method cannot completely solve the problem of stability of the steel slag, and is lack of an efficient and applicable technical means.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the problem of restricting the utilization of steel slag, improve the stability and activity of steel slag powder by utilizing the excitation and mineralization of microorganisms, and provide a method for preparing an admixture by modifying the steel slag powder by a microorganism technology.
The technical scheme is as follows: the invention provides a method for preparing an admixture by modifying steel slag powder by a microbial technology, which comprises the following steps:
(1) inoculating bacillus into the sterilized culture medium solution for culture, and centrifuging to prepare concentrated bacterial liquid, or preparing the bacterial liquid into bacterial powder which is recorded as a microbial additive; crushing, magnetically separating and ball-milling the steel slag into steel slag powder;
(2) mixing the bacterial powder and the steel slag powder according to the mass ratio of 0.01-0.03 to obtain a mixture, adding water and stirring, wherein the mass ratio of the water to the mixture is 0.15-0.25, or adding the concentrated bacterial liquid into the water and stirring, adding the concentrated bacterial liquid into the steel slag powder and stirring uniformly, wherein the mass ratio of the concentrated bacterial liquid to the steel slag powder is 0.01-0.05;
(3) carrying out natural maintenance;
(4) then placing the mixture in a curing box for curing;
(5) taking out, drying, grinding and sieving to obtain the steel slag admixture finished product.
Further, the bacillus comprises at least one of bacillus mucilaginosus, bacillus pasteurianus, bacillus pumilus, bacillus alkalophilus and bacillus subtilis.
Further, the concentration of the concentrated bacterial liquid is 107～109one/mL.
Further, the grain size of the steel slag powder is less than 300 um.
Further, the natural curing conditions are as follows: and (3) maintaining the materials at 12-24 hours under the environment that the temperature is 25 +/-1 ℃ and the relative humidity is 60 +/-5%, and marking as a material sealing process.
Further, the curing conditions in the curing box are as follows: at a temperature of 25 +/-1 ℃, a relative humidity of 60 +/-5 percent and CO2The volume fraction is 20-95%, and curing is carried out under the standard atmospheric pressure condition for 24-60 hours.
Has the advantages that: the invention improves the stability and activity of the steel slag powder, promotes the efficient and safe utilization of the steel slag as a secondary resource, and is beneficial to solving the pollution problem caused by the mass discharge and accumulation of the steel slag.
Drawings
FIG. 1 shows the effect of different amounts of microbes on the contents of magnesium oxide and calcium oxide in steel slag;
FIG. 2 shows the effect of different microorganism contents on the activity index of the steel slag mortar.
Detailed Description
Example 1
The preparation steps of the steel slag admixture of the embodiment are as follows:
(1) inoculating bacillus into a sterilized culture medium solution, wherein each liter of the culture medium contains 2-7 g of peptone, 4-6 g of beef extract, 12-16 g of agar and MgSO 240.4-0.7 g, controlling the pH value to be 7-8, performing shake culture at 30 +/-5 ℃ for 24h to obtain a bacillus mucilaginosus-containing bacterial liquid, centrifuging at the temperature of 5 ℃ at a high speed of 3000-5000 rpm for 15-20 min, removing an upper layer culture medium substance, adding a small amount of deionized water, and preparing the bacterial strain with the bacterial concentration of 107～109And (4) preparing the bacterial liquid into bacterial powder by using each/mL concentrated bacterial liquid and then using a QFN-8000S spray dryer.
(2) Crushing, magnetically separating and ball-milling the steel slag, and sieving to obtain steel slag powder with the particle size of less than 0.150 mm;
(3) mixing the bacterial powder and the steel slag powder according to the mass ratio of 0.02 to obtain a mixture, adding water and stirring, wherein the mass ratio of the water to the mixture is 0.2, then carrying out natural curing, and curing for 24 hours at the temperature of 25 +/-1 ℃ and the relative humidity of 60 +/-5%;
(4) resettingIn a curing box, at a temperature of 25 +/-1 ℃, a relative humidity of 60 +/-5 percent and CO2The volume fraction is 90 percent, and the curing is carried out under the standard atmospheric pressure condition by 48 hours;
(5) taking out, drying in a drying oven at the temperature lower than 60 ℃, and finally grinding through a 0.075mm square-hole sieve to obtain the steel slag admixture finished product.
The cement molding Rayleigh test piece of the steel slag admixture and the cement according to the mass ratio of 7: 3 refers to the GB/T1346-2011 standard test, the expansion value of the Rayleigh test piece of the steel slag admixture is greatly reduced, and the limited requirement is met; the activity index of the steel slag admixture is improved according to GBT51003-2014, and the activity index is more than 85 percent in 28 days.
Example 2
The microbial species used in this example were the same as those used in example 1.
The difference between the steps for preparing the steel slag admixture finished product in the embodiment and the embodiment 1 is that the mixing amount of the microbial powder is as follows: the mass ratio of the bacterial powder to the steel slag powder is 0.01.
Example 3
The microbial species used in this example were the same as those used in example 1.
The difference between the steps for preparing the steel slag admixture finished product in the embodiment and the embodiment 1 is that the mixing amount of the microbial powder is as follows: the mass ratio of the bacterial powder to the steel slag powder is 0.03.
Example 4:
in this embodiment, no microbial species is used.
The method comprises the following specific steps: crushing, magnetically separating and ball-milling the steel slag, and sieving to obtain steel slag powder with the particle size of less than 0.150 mm; uniformly stirring the steel slag powder and water according to the mass ratio of 1: 0.2, then carrying out natural curing, and curing for 24 hours at the temperature of 25 +/-1 ℃ and the relative humidity of 60 +/-5%; placing in a curing box at 25 + -1 deg.C and relative humidity of 60 + -5%, and adding CO2The volume fraction is 90 percent, and the curing is carried out under the standard atmospheric pressure condition by 48 hours; taking out, drying in a drying oven at the temperature lower than 60 ℃, and finally grinding through a 0.075mm square-hole sieve to obtain the steel slag admixture finished product.
The steel slag admixtures of examples 1 to 4 were tested and analyzed, and the results are shown in Table 1.
TABLE 1 influence of different microbial loads on the swelling value (mm) of Leeb's test pieces after boiling
Example 5:
the microbial species used in this example were the same as those used in example 1.
The difference between the steps for preparing the steel slag admixture finished product in the embodiment and the embodiment 1 is that the mixing amount of the microbial powder is as follows: the mass ratio of the bacterial powder to the steel slag powder is 0.12.
The expansion value of the Reye test piece is not obviously changed to 9.0 +/-0.5 mm with no microorganism, the strength is lower than that of an unmodified steel slag group, and the activity index in 28 days is lower than 70%.
By combining the attached figures 1 and 2, the table 1 and the analysis of the technical principle of the microorganism, it can be seen that when the doping amount of the microorganism is within a certain range, the microorganism can improve the conversion efficiency of unstable free oxides in the steel slag, further reduce f-CaO and f-MgO, improve the stability of the steel slag powder, and ensure the safe and reliable volume when the steel slag is used as an admixture. When the mixing amount is too much, the growth of microorganisms and the enzyme production efficiency are reduced, the activity is inhibited, so that the oxide in the steel slag powder is difficult to be consumed, and excessive microorganism components also cause adverse effects on the hydration reaction of cement, so that the activity index is reduced.
Claims (6)
1. A method for preparing admixture by modifying steel slag powder by microbial technology is characterized by comprising the following steps: the method comprises the following steps:
(1) inoculating bacillus into the sterilized culture medium solution for culture, and centrifuging to prepare concentrated bacterial liquid, or preparing the bacterial liquid into bacterial powder which is recorded as a microbial additive; crushing, magnetically separating and ball-milling the steel slag into steel slag powder;
(2) mixing the bacterial powder and the steel slag powder according to the mass ratio of 0.01-0.03 to obtain a mixture, adding water and stirring, wherein the mass ratio of the water to the mixture is 0.15-0.25, or adding the concentrated bacterial liquid into the water and stirring, adding the concentrated bacterial liquid into the steel slag powder and stirring uniformly, wherein the mass ratio of the concentrated bacterial liquid to the steel slag powder is 0.01-0.05;
(3) carrying out natural maintenance;
(4) then placing the mixture in a curing box for curing;
(5) taking out, drying, grinding and sieving to obtain the steel slag admixture finished product.
2. The method of claim 1 for preparing an admixture from the microbiologically modified steel slag powder, wherein the admixture comprises: the bacillus comprises at least one of bacillus mucilaginosus, bacillus pasteurianus, bacillus pumilus, bacillus alcalophilus and bacillus subtilis.
3. The method of claim 1 for preparing an admixture from the microbiologically modified steel slag powder, wherein the admixture comprises: the concentration of the concentrated bacterial liquid is 107～109one/mL.
4. The method of claim 1 for preparing an admixture from the microbiologically modified steel slag powder, wherein the admixture comprises: the grain size of the steel slag powder is less than 300 um.
5. The method of claim 1 for preparing an admixture from the microbiologically modified steel slag powder, wherein the admixture comprises: the natural maintenance conditions are as follows: and (3) maintaining the materials at 12-24 hours under the environment that the temperature is 25 +/-1 ℃ and the relative humidity is 60 +/-5%, and marking as a material sealing process.
6. The method of claim 1 for preparing an admixture from the microbiologically modified steel slag powder, wherein the admixture comprises: the curing conditions in the curing box are as follows: at a temperature of 25 +/-1 ℃, a relative humidity of 60 +/-5 percent and CO2The volume fraction is 20-95%, and curing is carried out under the standard atmospheric pressure condition for 24-60 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979193A (en) * | 2021-03-09 | 2021-06-18 | 东北大学 | Preparation method of bio-based fly ash admixture |
| CN113860779A (en) * | 2021-11-23 | 2021-12-31 | 天津市建筑科学研究院有限公司 | Method for pretreating steel slag by microorganisms |
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| CN106145732A (en) * | 2016-06-28 | 2016-11-23 | 东南大学 | Weak acid is used to accelerate the method that microbial mineralization alkaline waste prepares building material |
| CN106966673A (en) * | 2017-01-24 | 2017-07-21 | 东南大学 | A kind of method of acceleration microbial mineralization alkali solid discarded object |
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2020
- 2020-07-21 CN CN202010707858.7A patent/CN111943543A/en active Pending
Patent Citations (4)
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| CN105481469A (en) * | 2015-12-09 | 2016-04-13 | 东南大学 | Method used for preparing solid waste building material products based on microorganism mineralization induction technology |
| CN106145732A (en) * | 2016-06-28 | 2016-11-23 | 东南大学 | Weak acid is used to accelerate the method that microbial mineralization alkaline waste prepares building material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979193A (en) * | 2021-03-09 | 2021-06-18 | 东北大学 | Preparation method of bio-based fly ash admixture |
| CN113860779A (en) * | 2021-11-23 | 2021-12-31 | 天津市建筑科学研究院有限公司 | Method for pretreating steel slag by microorganisms |
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