CN113603407A - Method for preparing biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms - Google Patents
Method for preparing biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms Download PDFInfo
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- CN113603407A CN113603407A CN202111030632.9A CN202111030632A CN113603407A CN 113603407 A CN113603407 A CN 113603407A CN 202111030632 A CN202111030632 A CN 202111030632A CN 113603407 A CN113603407 A CN 113603407A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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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Abstract
The invention discloses a method for preparing a biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms, belonging to the field of geotechnical engineering. The method comprises the following steps: processing rare earth tailings; the preparation of the curing liquid comprises the preparation of a bacterial liquid and a cementing liquid; and (5) manufacturing the biological brick. The method for manufacturing the biological brick adopts a slurry mixing and demoulding mode, the process is simple, the cost is low, the manufacturing process is green and pollution-free, the prepared biological brick can meet the requirement of temporary storage of the rare earth tailing sand, the environmental problem caused by accumulation of the rare earth tailing sand is solved, and a foundation is laid for secondary recycling of the rare earth tailing sand.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and relates to a method for preparing a biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms, in particular to a method for storing rare earth tailings sand by preparing a biological brick through bacteria.
Background
As an important metal mineral resource, the rare earth has low comprehensive utilization rate in China, and a large amount of rare earth tailings are accumulated in sand since the mining; the utilization of rare earth tailings in China comprises two aspects, namely, the recovery rate of the rare earth tailings is improved on the technical level, and the rare earth tailings are used for developing new building materials in accordance with the international mainstream. The rare earth tailings sand is used as waste after the mineral separation process, contains a large amount of pollutants such as heavy metals, and the like, and the long-term stacked rare earth tailings sand not only pollutes water, soil and the like, but also threatens the human body and seriously damages the ecological environment.
Microorganism induced calcium carbonate precipitation is a microorganism mineralization technology combining chemical solidification and microorganism repair, and microorganisms can utilize urease to rapidly hydrolyze urea to generate carbonate ions, further form calcium carbonate crystals with calcium ions, and fix heavy metal ions through the actions of cementation, coprecipitation and the like of the heavy metal ions. Meanwhile, the generated calcium carbonate fills pores of the soil body and cemented soil particles, so that the strength of the soil body can be improved, the permeability can be reduced, the liquefaction resistance of the sand foundation can be improved, and the like.
In recent years, along with the deep research, methods for treating and utilizing tailing sand continuously appear, such as the tailing sand proposed by the anisodamine (feasibility research [ J ] of tailing sand filling highway subgrade, proceedings of Guangdong institute of transportation and occupational technology, 2012, 11 (03): 21-23.) and the like is taken as highway subgrade filler, the tailing sand is considered to be suitable to be taken as the subgrade filler when 15% of the tailing sand is mixed with soil, and although the method improves the utilization value of the tailing sand, the environmental benefit brought by the tailing sand is not considered; zhangli (a gel material for curing typical nonferrous metal tailings and a green wall material preparation research [ D ]. Anhui Industrial university, 2019.) a tailing baking-free brick sample is prepared by a dry pressing forming method by adopting a gel material and copper tailing sand, the brick has high strength and better water resistance and frost resistance, but indexes of the copper tailing sand in the prepared baking-free brick are changed, and the brick is difficult to be secondarily utilized; the microbiological mineralization test is carried out on the tailings sand by Chenxi sea (experimental research on the property of the tailings sand improved by the microbiological mineralization [ J ]. Industrial architecture, 2016, 46 (06): 94-98.) and the like, the microbiological mineralization is proposed to improve the strength of the tailings sand and simultaneously solidify the heavy metals in the tailings sand, but only an indoor test is carried out on the solidification of the tailings sand, and no solution is proposed for the harmless storage of the tailings sand.
In conclusion, the invention provides a method for preparing a biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms, which can effectively solve the problem of pollution caused by the storage and storage processes of the rare earth tailings sand.
Disclosure of Invention
The invention aims to provide a method for preparing a biological brick by using rare earth tailings sand through precipitation and solidification of calcium carbonate induced by microorganisms, so as to solve the problems of storage of the rare earth tailings sand and the problems of low strength, high manufacturing cost and serious pollution of the biological brick in the prior art.
The invention aims to realize the aim, and provides a method for preparing a biological brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms, which comprises the following steps:
Placing the rare earth tailing sand in a clean tray, and then placing the tray in an oven, wherein the temperature of the oven is set to be 85-100 ℃, and the drying time is 24-48 h;
crushing the dried rare earth tailings by using a stone crushing machine, and sieving the crushed rare earth tailings by using a soil sieve with the particle size of 1 mm;
marking the treated rare earth tailing sand as rare earth tailing dry sand;
Step 2.1, preparation of bacterial liquid
The American culture Collection recommended formula ATCC 1376NH is adopted4Preparing culture solution by-YE, sterilizing the culture solution at 121-123 ℃ for 20-30 min, placing the culture solution on an ultraclean workbench for ultraviolet sterilization and introducingWind, when the temperature of the culture solution is reduced to room temperature for standby;
after the temperature of the culture solution is reduced to room temperature, taking the culture solution into a conical flask, adding the pasteurella bacillus into the culture solution by using a sterile pipette to obtain a bacterial solution, wherein the volume ratio of the pasteurella bacillus to the culture solution is 1: 100, putting the bacterial solution into an incubator for culturing, setting the temperature of the incubator to be 28-32 ℃, setting the oscillation frequency to be 100-250 rpm, and setting the culture time to be 48-72 h;
measuring the light absorption value OD of the cultured bacteria liquid at the wavelength of 600nm600At D600Taking out the blank when the blank is 1.0-1.8;
step 2.2, preparation of the cementing liquid
Placing anhydrous calcium chloride and urea solution with a molar ratio of 1: 1 into a beaker, adding deionized water, stirring, and dissolving to form a cementing solution, wherein the mass concentrations of the calcium chloride and the urea in the cementing solution are respectively 1%;
step 2.3, preparation of curing liquid
Uniformly mixing the bacterial liquid obtained in the step 2.1 and the cementing liquid obtained in the step 2.2 in a volume ratio of 1: 1 to obtain a curing liquid;
Pouring the curing liquid obtained in the step 2 into the rare earth tailing dry sand obtained in the step 1 according to the material liquid volume ratio of the rare earth tailing dry sand to the curing liquid of 1.5: 1, stirring to obtain a biological brick raw material, and compacting the biological brick raw material, wherein the compaction degree is not lower than 95%;
transferring the compacted biological brick raw materials into a brick making mold, carrying out curing reaction for 2 to 3 days at a curing temperature of between 25 and 35 ℃ and a humidity of between 25 and 35 percent, and demoulding and drying after curing to obtain the biological brick.
Preferably, the American type culture Collection recommended formula ATCC 1376NH4The composition of the culture broth of the YE configuration was: 20g yeast extract, 10g (NH)4)2SO40.13mol/L Tris Buffer, deionized water to 1L, and 1mol/L HCl to adjust the pH of the culture solution to 9.0.
Preferably, the bacillus pasteurii is american type culture collection number ATCC 11859.
Preferably, the stirring and stirring manner is adopted for stirring and stirring the slurry in the step 3, specifically, clockwise stirring and counterclockwise stirring are alternately performed, and the number of turns of clockwise stirring and counterclockwise stirring is the same.
Preferably, before the compacted raw material of the biological brick is transferred into a brick making mold in the step 3, a layer of preservative film is laid or a layer of vaseline is brushed inside the brick making mold.
Compared with the prior art, the beneficial effects of the invention comprise:
1. the source of the microorganism is wide, the resource is rich, and the microorganism resource in the nature can be fully utilized;
2. the microorganism is easy to culture, the propagation is fast, the process for preparing the biological brick is simple, and the preparation period is short;
3. the environment is friendly, the prepared biological brick does not pollute the environment, and simultaneously, the heavy metal in the rare earth tailing sand can be solidified in the biological brick;
4. the prepared biological brick has high strength and good soil particle cementing effect, and meets the requirement of stacking the biological bricks;
5. the biological brick can not change elements and minerals in the original rare earth tailings sand, and is convenient for secondary utilization of the rare earth tailings sand.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph showing the pressure resistance of the bio-brick according to the embodiment of the present invention;
FIG. 3 is a soil granularity detection map before and after preparation of the biological brick in the embodiment of the invention;
FIG. 4 is a diagram showing the variation of element types before and after the preparation of the bio-brick in the embodiment of the present invention.
Detailed Description
The process of the present invention is further described below with reference to examples.
FIG. 1 is a flow chart of the method of the present invention, and it can be seen from the figure that, in the present example, the steps of the method for preparing the bio-brick by solidifying the rare earth tailings sand through the microorganism-induced calcium carbonate precipitation are as follows:
Placing the rare earth tailing sand in a clean tray, and then placing the tray in an oven, wherein the temperature of the oven is set to be 85-100 ℃, and the drying time is 24-48 h.
Crushing the dried rare earth tailings by a stone crushing machine, and sieving the crushed rare earth tailings by a soil sieve with the particle size of 1 mm.
And marking the treated rare earth tailing sand as rare earth tailing dry sand.
Step 2.1, preparation of bacterial liquid
The American culture Collection recommended formula ATCC 1376NH is adopted4Preparing a culture solution by YE, sterilizing the culture solution at 121-123 ℃ for 20-30 min, placing the culture solution on an ultra-clean workbench for ultraviolet sterilization and ventilation, and cooling the culture solution to room temperature for later use.
And (2) after the temperature of the culture solution is reduced to room temperature, taking the culture solution into a conical flask, adding the pasteurella bacillus into the culture solution by using a sterile pipette to obtain a bacterial solution, wherein the volume ratio of the pasteurella bacillus to the culture solution is 1: 100, putting the bacterial solution into an incubator for culture, setting the temperature of the incubator to be 28-32 ℃, setting the oscillation frequency to be 100-250 rpm, and setting the culture time to be 48-72 h. In this example, the temperature of the incubator was set to 30 ℃, the oscillation frequency was set to 200rpm, and the incubation time was set to 48 hours.
Measuring the light absorption value OD of the cultured bacteria liquid at the wavelength of 600nm600At D600And taking out the blank when the blank is 1.0-1.8 for later use. In this embodiment, at OD600When the concentration is 1.0, the bacterial solution is taken out for use.
Step 2.2, preparation of the cementing liquid
Placing anhydrous calcium chloride and urea solution with a molar ratio of 1: 1 into a beaker, adding deionized water, stirring, and dissolving to form a cementing solution, wherein the mass concentrations of the calcium chloride and the urea in the cementing solution are respectively 1%.
Step 2.3, preparation of curing liquid
And (3) uniformly mixing the bacterial liquid obtained in the step (2.1) and the cementing liquid obtained in the step (2.2) in a volume ratio of 1: 1 to obtain a curing liquid.
In this example, the American type culture Collection recommended formula ATCC 1376NH4The composition of the culture broth of the YE configuration was: 20g yeast extract, 10g (NH)4)2SO40.13mol/L Tris Buffer, deionized water to 1L, and 1mol/L HCl to adjust the pH of the culture solution to 9.0.
In this example, the Bacillus pasteurianus is American type culture Collection number ATCC 11859.
And (2) according to the material liquid volume ratio of the rare earth tailing dry sand to the curing liquid of 1.5: 1, pouring the curing liquid obtained in the step (2) into the rare earth tailing dry sand obtained in the step (1), stirring to obtain a biological brick raw material, and then compacting the biological brick raw material, wherein the compaction degree is not lower than 95%.
Transferring the compacted biological brick raw materials into a brick making mold, carrying out curing reaction for 2 to 3 days at a curing temperature of between 25 and 35 ℃ and a humidity of between 25 and 35 percent, and demoulding and drying after curing to obtain the biological brick.
In this embodiment, the stirring and slurry mixing manner is adopted for the slurry mixing, specifically, clockwise stirring and counterclockwise stirring are alternately performed, and the number of turns of clockwise stirring and counterclockwise stirring is the same.
In this embodiment, before the compacted raw material of the biological brick is transferred to a brick making mold, a layer of preservative film is laid or a layer of vaseline is brushed inside the brick making mold.
In order to demonstrate the effect of the present invention, the bio-brick prepared in this example was tested.
FIG. 2 is a graph showing the pressure resistance of the bio-brick in the example of the present invention. In fig. 1, the abscissa represents the test specimen number, and the ordinate represents the unconfined compressive strength. The instrument adopted for detecting the compressive strength in the indoor experiment is an electric limestone soil unconfined pressure instrument, and the specification of a detection sample is that the height-diameter ratio is 2: 1. Experimental results show that the compressive strength of the prepared biological bricks is about 600kpa, the hardness of the biological bricks reaches the level capable of being stacked, and the possibility of stacking the rare earth tailings sand in the form of the biological bricks is proved.
FIG. 3 is a soil granularity detection chart before and after the preparation of the biological brick in the embodiment of the invention. From the particle size ranges of the two groups of soil samples, the particle size distribution before and after the preparation of the biological bricks is basically the same and is probably between 0.001mm and 0.1mm, the particle size distribution reaches the maximum volume ratio between 0.01mm and 0.03mm, the particle size ratio is basically unchanged and is close to the undisturbed soil in the process of preparing the rare earth tailing sand biological bricks by using calcium carbonate precipitation induced by microorganisms, and the feasibility of storing the rare earth tailing sand in the form of the biological bricks is also shown.
FIG. 4 is a diagram showing the variation of element types before and after the preparation of the bio-brick in the embodiment of the present invention. The elements in the rare earth tailings sand are measured by TCLP and ICP-MS experiments, and the main elements comprise elements such as silicon, oxygen, iron, aluminum, carbon, copper, magnesium and the like. As can be seen from FIG. 3, the kind of soil elements hardly changed before and after the preparation of the bio-brick. The main elements of the tailings sand are silicon, oxygen, iron, aluminum and carbon no matter undisturbed soil or biological bricks, and the sum of the five elements exceeds 90 percent and is respectively 95.52 percent and 90.08 percent. In the curing process, the main components of the cementing liquid are anhydrous calcium chloride and urea, so that the contents of calcium, chlorine and nitrogen in the curing soil are obviously increased as is obvious from a bar graph. The comparative analysis shows that the main components and the content ratio of the tailing sand can not be obviously changed in the process of preparing the rare earth tailing sand biological brick by the microorganism-induced calcium carbonate precipitation, which indicates the rationality of preparing the rare earth tailing sand biological brick.
Claims (5)
1. A method for preparing a biological brick by using calcium carbonate precipitation and solidification rare earth tailings sand induced by microorganisms is characterized by comprising the following steps:
step 1, treatment of rare earth tailings sand
Placing the rare earth tailing sand in a clean tray, and then placing the tray in an oven, wherein the temperature of the oven is set to be 85-100 ℃, and the drying time is 24-48 h;
crushing the dried rare earth tailings by using a stone crushing machine, and sieving the crushed rare earth tailings by using a soil sieve with the particle size of 1 mm;
marking the treated rare earth tailing sand as rare earth tailing dry sand;
step 2, preparation of curing liquid
Step 2.1, preparation of bacterial liquid
The American culture Collection recommended formula ATCC 1376NH is adopted4Preparing a culture solution by YE, sterilizing the culture solution at 121-123 ℃ for 20-30 min, placing the culture solution on an ultra-clean workbench for ultraviolet sterilization and ventilation, and cooling the culture solution to room temperature for later use;
after the temperature of the culture solution is reduced to room temperature, taking the culture solution into a conical flask, adding the pasteurella bacillus into the culture solution by using a sterile pipette to obtain a bacterial solution, wherein the volume ratio of the pasteurella bacillus to the culture solution is 1: 100, putting the bacterial solution into an incubator for culturing, setting the temperature of the incubator to be 28-32 ℃, setting the oscillation frequency to be 100-250 rpm, and setting the culture time to be 48-72 h;
measuring the light absorption value OD of the cultured bacteria liquid at the wavelength of 600nm600At D600Taking out the blank when the blank is 1.0-1.8;
step 2.2, preparation of the cementing liquid
Placing anhydrous calcium chloride and urea solution with a molar ratio of 1: 1 into a beaker, adding deionized water, stirring, and dissolving to form a cementing solution, wherein the mass concentrations of the calcium chloride and the urea in the cementing solution are respectively 1%;
step 2.3, preparation of curing liquid
Uniformly mixing the bacterial liquid obtained in the step 2.1 and the cementing liquid obtained in the step 2.2 in a volume ratio of 1: 1 to obtain a curing liquid;
step 3, making biological bricks
Pouring the curing liquid obtained in the step 2 into the rare earth tailing dry sand obtained in the step 1 according to the material liquid volume ratio of the rare earth tailing dry sand to the curing liquid of 1.5: 1, stirring to obtain a biological brick raw material, and compacting the biological brick raw material, wherein the compaction degree is not lower than 95%;
transferring the compacted biological brick raw materials into a brick making mold, carrying out curing reaction for 2 to 3 days at a curing temperature of between 25 and 35 ℃ and a humidity of between 25 and 35 percent, and demoulding and drying after curing to obtain the biological brick.
2. The method for preparing bio-brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms according to claim 1, wherein the American type culture Collection recommended formula ATCC 1376NH4The composition of the culture broth of the YE configuration was: 20g yeast extract, 10g (NH)4)2SO40.13mol/L Tris Buffer, deionized water to 1L, and 1mol/L HCl to adjust the pH of the culture solution to 9.0.
3. The method for preparing a bio-brick by solidifying rare earth tailings sand through calcium carbonate precipitation induced by microorganisms according to claim 1, wherein the bacillus pasteurii is american type culture collection number ATCC 11859.
4. The method for preparing the biological brick by the microorganism-induced calcium carbonate precipitation solidification of the rare earth tailings sand according to claim 1, wherein the slurry mixing in the step 3 is performed by a slurry mixing and stirring manner, specifically, clockwise stirring and counterclockwise stirring are alternately performed, and the number of turns of clockwise stirring and counterclockwise stirring is the same.
5. The method for preparing the bio-brick by solidifying the rare earth tailings sand through the microorganism-induced calcium carbonate precipitation according to the claim 1, wherein a layer of preservative film is laid or a layer of vaseline is brushed on the interior of the brick-making mold before the compacted bio-brick raw material is transferred into the brick-making mold in the step 3.
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| CN114804732A (en) * | 2022-03-21 | 2022-07-29 | 合肥工业大学 | Method for preparing roadbed filler by using alkaline residue and microorganism modified tailing sand |
| CN116283007A (en) * | 2023-03-03 | 2023-06-23 | 河海大学 | Coral aggregate based on microorganism repair enhancement and preparation method and device thereof |
| CN117069473A (en) * | 2023-07-04 | 2023-11-17 | 华中科技大学 | Method for preparing biological brick by mineralization of microorganism in cotton substrate |
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| CN117069473A (en) * | 2023-07-04 | 2023-11-17 | 华中科技大学 | Method for preparing biological brick by mineralization of microorganism in cotton substrate |
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