Microbial sand brick preparation device and method based on regenerated material
By using steel slag to prepare microbial sand bricks, the problems of high cost and poor environmental friendliness of sand materials have been solved, achieving efficient and safe sand brick preparation and realizing environmentally friendly resource utilization.
Patent Information
- Application Number
- CN202511200504.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-26
- Publication Date
- 2025-11-28
AI Technical Summary
Existing microbial sand bricks use sand materials that are costly and have poor environmental friendliness. The preparation methods are not uniform and the sand bricks have poor uniformity and bonding effect. At the same time, steel slag is not effectively utilized, resulting in environmental pollution and resource waste.
Using steel slag as sand material, microbial sand bricks are prepared using microbial-induced calcium carbonate technology. The injection of bacterial solution and cementing solution is controlled by a peristaltic pump, and combined with grouting molds and filters, high-strength microbial sand bricks are produced.
It achieves cost savings and environmental friendliness, improves the uniformity and bonding effect of sand bricks, solves the problem of resource utilization of steel slag, and has significant social and economic benefits.
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Figure CN121018731A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of microbial sand brick preparation, and particularly relates to a microbial sand brick preparation device and method based on recycled materials. BACKGROUND
[0002] With the rapid development of economy and science and technology in China, building technology is constantly innovating, and in modern building construction, the goals of high efficiency, economy, energy saving, environmental protection, etc. are more pursued. The traditional clay brick material not only consumes a large amount of resources in the production process, but also causes environmental pollution. At the same time, a large amount of heat is released during the preparation process, and a large amount of carbon dioxide is emitted. In order to meet the requirements of the people and the sustainable development strategy of the state for the construction industry, in recent years, scholars at home and abroad have carried out a lot of research and exploration on new building materials. As a relatively new civil engineering material, since MICP technology was first proposed by Whiffin in 2004 for soil solidification, more and more researchers have carried out research around this technology. The bricks produced by the microbial induced calcium carbonate technology do not require high temperature conditions during the production process, thereby reducing the emission of carbon dioxide, which is conducive to the "double carbon" goal and has good development prospects. However, up to now, the sand material used in microbial sand bricks is silica sand, which has a relatively high cost and needs to be mined and processed in a factory, and the environmental friendliness is relatively poor. At the same time, up to now, the method for preparing sand bricks has not been unified, and the uniformity of the sand bricks prepared by most methods is poor, and the cementing effect is poor, which also causes waste of cementing liquid.
[0003] Steel slag is a by-product in the steelmaking process. For every ton of steel produced, 15-20% of steel slag is usually generated. Nationwide, the total amount of steel slag has exceeded 300 million tons, occupying an area of more than 6 million square meters, and still growing at a rate of more than 30 million tons per year. However, most of the steel slag has not been effectively utilized, leading to land occupation, river siltation, ecological destruction, environmental pollution, and resource waste. The main challenges of steel slag utilization are two-fold: on the one hand, the activity of steel slag is low, and the hydration reaction of silicate minerals is slow, resulting in low effective utilization rate of mineral composition; on the other hand, free calcium oxide and free magnesium oxide in steel slag will expand and crack when exposed to water, resulting in poor stability and potential safety hazards. Therefore, efficient and safe utilization of steel slag as a secondary resource not only effectively alleviates environmental problems caused by its emission and accumulation, but also has significant social and economic benefits. SUMMARY
[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a microbial sand brick preparation device based on recycled materials.
[0005] To solve the above technical problems, the present application provides the following technical solutions: a microbial sand brick preparation device based on recycled materials, comprising:
[0006] A grouting mold, the grouting mold comprises a detachable shell, a top cover, a bottom cover, a backing plate and a gasket, the detachable shell is threadedly connected with the top cover and the bottom cover at both ends respectively, the gasket is movably installed on the inner wall of the grouting mold, the gasket is tightly attached to the inner wall of the grouting mold, the backing plate is installed on the bottom cover, and the filter element is installed on the backing plate and below the top cover;
[0007] A peristaltic pump, one end of the peristaltic pump is connected with the bacteria solution container and the cementing solution container through a pipeline, and the other end of the peristaltic pump is communicated with one end of the sand brick grouting mold through a pipeline;
[0008] A waste liquid collector, the waste liquid collector is communicated with the other end of the sand brick grouting mold through a pipeline.
[0009] As a further improved scheme: the grouting mold is in a cylindrical or cuboid structure.
[0010] As a further improved scheme: the top cover and the bottom cover are provided with through holes, rubber plugs are embeddedly installed in the through holes, and a single-way connector is connected, and the pipeline at the other end of the peristaltic pump and the pipeline at the other end of the sand brick grouting mold are both communicated with one end of the sand brick grouting mold through the single-way connector.
[0011] As a further improved scheme: the filter element is a double-layer gauze.
[0012] The present application also provides a microbial sand brick preparation method based on recycled materials, which adopts the microbial sand brick preparation device based on recycled materials and comprises the following steps:
[0013] The steel slag is filled into the mold in an equal volume according to a target dry density;
[0014] The grouting mold and the pipeline are installed, the bacteria solution is injected at a flow rate of 2 mL / min by controlling the peristaltic pump, and the volume of the bacteria solution is 1.2 times the pore volume of the steel slag;
[0015] After standing for 3 hours, the cementing solution is injected at a flow rate of 0.3-0.5 mL / min by controlling the peristaltic pump;
[0016] The step 3 is repeated for 3 times, the mold is turned over and the inlet / outlet ports are exchanged after grouting each time;
[0017] After standing for 2 hours, the mold is disassembled, dried at 60 degrees Celsius, and then washed to remove soluble salts, so that the microbial sand brick is obtained.
[0018] As a further improved scheme: the bacteria solution is a bacillus pasteurii solution, and the concentration is 4.0x10 8 -5.0x108 cells / mL.
[0019] As a further improvement: the solution of 0.5 mol CaCl2 mixed with an equal number of moles of urea.
[0020] Compared with the prior art, the beneficial effects of the present application are: using steel slag as the sand column base material, which replaces ordinary sintered bricks and microbial sand bricks with silica sand as the base material, saves costs, protects the environment, and realizes the purpose of solid waste resource utilization. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A cuboid structure grouting mold structure diagram of a microbial sand brick preparation device based on recycled materials Figure One ;
[0022] Figure 2 A cuboid structure grouting mold structure diagram of a microbial sand brick preparation device based on recycled materials Figure Two ;
[0023] Figure 3 A cylindrical structure grouting mold structure diagram of a microbial sand brick preparation device based on recycled materials Figure One ;
[0024] Figure 4 A cylindrical structure grouting mold structure diagram of a microbial sand brick preparation device based on recycled materials Figure Two ;
[0025] In the figure: 1, rubber plug; 2, top cover; 3, detachable shell; 4, pad; 5, thread; 6, bottom cover. DETAILED DESCRIPTION
[0026] The technical solutions of the present application will be further described in detail below in conjunction with specific embodiments.
[0027] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.
[0028] Please refer to Figures 1 to 4 , in one embodiment, a microbial sand brick preparation device based on recycled materials, comprising:
[0029] The grouting mold comprises a detachable shell 3, a top cover 2, a bottom cover 6, a cushion plate 4 and a gasket, the detachable shell 3 is connected with the top cover 2 and the bottom cover 6 at both ends through threads 5, the gasket is movably installed on the inner wall of the detachable shell 3 and tightly abuts against the inner wall of the detachable shell 3, the cushion plate 4 is installed on the bottom cover 6, and a filter element is installed on the cushion plate 4 and below the top cover 2.
[0030] The peristaltic pump is connected with the bacteria liquid container and the cementing liquid container through a pipeline at one end and is communicated with the one end of the sand brick grouting mold through a pipeline at the other end.
[0031] The waste liquid collector is communicated with the other end of the sand brick grouting mold through a pipeline.
[0032] In the embodiment, the bacteria liquid container and the cementing liquid container can adopt beakers, the pipeline adopts a silica gel pipe, the silica gel pipe serves to transport the bacteria liquid, the cementing liquid and the waste liquid, the mold serves to load sand materials, shapes the sand brick and ensures that the grouted liquid does not leak, since the steel slag has great fluidity, in order to make the steel slag meet the actual application requirements after shaping, the gasket is placed in the detachable shell 3, the sand column (sand brick) is fixed, the sand column (sand brick) after solidification is prevented from sticking to the detachable shell 3, the sand column (sand brick) is prevented from being difficult to demold and being damaged in the demolding process, and the gasket adopts a plastic material.
[0033] In order to ensure the sealing property of the grouting mold for fixing the sand column (sand brick) and preventing liquid leakage during grouting of the bacteria liquid and the cementing liquid, the left and right two parts of the detachable shell 3 adopt a mortise and tenon type connecting structure, threads 5 are arranged on the upper and lower parts, the detachable shell 3 is better connected with the top cover 2 and the bottom cover 6, and the top part is provided with an O-shaped ring to ensure the sealing property of the device.
[0034] The peristaltic pump mainly serves to transport the bacteria liquid and the cementing liquid at a controllable speed, can ensure that the bacteria liquid and the cementing liquid are transported into the mold in a constant flow mode, the silica gel pipe serves as a carrier for transporting the bacteria liquid and the cementing liquid, and the mold mainly serves to shape the sand column (sand brick), the cementing liquid and the bacteria liquid are used for solidifying the steel slag to make the steel slag into a microbial sand brick, and the beaker is mainly used for placing the cementing liquid and the bacteria liquid and receiving the discharged waste liquid.
[0035] Please refer to Figure 1 , Figure 2 In one embodiment, the grouting mold is in a cylindrical or cuboid structure.
[0036] In the embodiment, the cylindrical structure is a sand column grouting mold, and finally a sand column is formed, the cuboid structure is a sand brick grouting mold, and finally a sand brick is formed, and different shapes of the grouting mold can meet the shape requirements of the sand brick in different engineering and tests.
[0037] Please refer toFigures 1 to 4 In one embodiment, the top cover 2 and the bottom cover 6 are provided with through holes, rubber plugs 1 are embedded and installed in the through holes, and single-way joints are connected, and the other end pipe of the peristaltic pump is communicated with one end of the grouting mold and the other end of the pipe through the single-way joints.
[0038] In the embodiment, the top cover 2 and the bottom cover 6 are provided with through holes for connecting the rubber plugs, the rubber plugs are connected with the single-way joints, and the single-way joints are used for connecting the grouting inlet or the grouting outlet, the connection positions are fixed by the waterproof tapes and the locks, the sealing of the mold is ensured, and the filter is installed on the base plate 4 and below the top cover 2, so that the precipitation of the steel slag is hindered while the flowability is ensured.
[0039] In one embodiment, the filter is a double-layer gauze.
[0040] In the embodiment, the double-layer gauze is arranged above and below the sand brick, so that the bacteria solution can be infiltrated while the precipitation of the steel slag is prevented.
[0041] In the application, the cementing liquid and the bacteria solution are grouted into the steel slag sand brick at a uniform and controllable speed, so that the solidification is more uniform, the strength of the sand column is ensured, and the production efficiency is increased. The sand brick is made of the steel slag as the sand material to replace the ordinary sintered brick, the purpose of the solid waste resource utilization is achieved while the environment is friendly and the carbon emission is reduced. The sand column grouting mold and the sand brick grouting mold mainly play a role in shaping the sand brick, and meanwhile, the drawbacks of the difficulty in demolding of the formed sand brick after solidification and the poor cementing effect caused by the waste of the cementing liquid and the bacteria solution during the grouting process are avoided, and the brick making efficiency is increased.
[0042] The application further provides a microbial sand brick preparation method based on a regenerated material.
[0043] The steel slag is filled into the mold in an equal volume according to a target dry density;
[0044] The grouting mold and the pipeline are installed, the bacteria solution is injected at a flow rate of 2 mL / min by controlling the peristaltic pump, the volume of the bacteria solution is 1.2 times the pore volume of the steel slag, the bacteria solution is a bacillus pasteurii solution, the concentration is 4.0*10 8 cells / mL, and the urease activity is greater than or equal to 27.432 mmol / (L·min);
[0045] After standing for 3 hours, the cementing liquid is injected at a flow rate of 0.3 mL / min by controlling the peristaltic pump, the cementing liquid is a mixed solution of 0.5 mol of CaCl2 and an equal number of moles of urea;
[0046] The step is repeated for three times, the mold is turned over and the grouting inlet and outlet are exchanged after each grouting;
[0047] After 2h, the mold was removed, and the microbial sand brick was obtained by drying at 60℃ and washing with water to remove soluble salts.
[0048] In this embodiment, after assembly, the steel slag was poured into the mold in an equal volume according to the target dry density, then the mold was padded with gauze at both ends, the gasket was loaded into the mold, the top cover 2 and the bottom cover 6 were tightly covered, the rubber plug 1 at the inlet and the rubber plug 1 at the outlet were inserted into the top cover 2 and the bottom cover 6 and sealed, after checking the sealing of the mold, the peristaltic pump was opened, the bacterial solution was connected to the other end, and the grouting began. First, the bacterial solution was injected at a flow rate of 2mL / min, and the volume of the bacterial solution was 1.2 times the pore volume of the steel slag,
[0049] In one embodiment, the steel slag was filled into the mold in an equal volume according to the target dry density;
[0050] The grouting mold and the pipeline were installed, and the bacterial solution was injected at a flow rate of 2mL / min by controlling the peristaltic pump, and the volume of the bacterial solution was 1.2 times the pore volume of the steel slag. The bacterial solution was a Bacillus pasteurii solution with a concentration of 4.5×10 8 cells / mL, and the urease activity was greater than or equal to 27.432mmol / (L·min);
[0051] After 3h, the cementing solution was injected at a flow rate of 0.4mL / min by controlling the peristaltic pump, and the cementing solution was a mixed solution of 0.5mol CaCl2 and an equal number of moles of urea.
[0052] Step 3 was repeated three times, and the mold was turned over and the inlet / outlet ports were exchanged after each grouting.
[0053] After 2h, the mold was removed, and the microbial sand brick was obtained by drying at 60℃ and washing with water to remove soluble salts.
[0054] In one embodiment, the steel slag was filled into the mold in an equal volume according to the target dry density;
[0055] The grouting mold and the pipeline were installed, and the bacterial solution was injected at a flow rate of 2mL / min by controlling the peristaltic pump, and the volume of the bacterial solution was 1.2 times the pore volume of the steel slag. The bacterial solution was a Bacillus pasteurii solution with a concentration of 5.0×10 8 cells / mL, and the urease activity was greater than or equal to 27.432mmol / (L·min);
[0056] After 3h, the cementing solution was injected at a flow rate of 0.5mL / min by controlling the peristaltic pump, and the cementing solution was a mixed solution of 0.5mol CaCl2 and an equal number of moles of urea.
[0057] Step 3 was repeated three times, and the mold was turned over and the inlet / outlet ports were exchanged after each grouting.
[0058] After standing for 2h, the mold was removed, and the soluble salt was removed by water washing to obtain the microbial sand brick.
[0059] The microbial sand brick prepared by the mold was subjected to unconfined compressive strength test, and the average compressive strength was more than 10MPa, which could reach the compressive strength grade of MU10, and could be applied to building structure engineering.
[0060] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the foregoing description, and it is intended that all changes that come within the meaning and range of equivalency of the claims are embraced therein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.
[0061] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.
Claims
1. A device for preparing microbial sand bricks based on recycled materials, characterized in that, include: A grouting mold, comprising a detachable shell, a top cover, a bottom cover, a pad, and a gasket. The top cover and the bottom cover are threaded to both ends of the detachable shell, and a gasket is movably installed on the inner wall of the grouting mold. The gasket is in close contact with the inner wall of the grouting mold. A pad is installed on the bottom cover, and a filter element is installed on the pad and below the top cover. A peristaltic pump, one end of which is connected to a bacterial solution container and a cementing solution container via a pipe, and the other end of which is connected to one end of a sand brick grouting mold via a pipe; Waste liquid collector, which is connected to the other end of the sand brick grouting mold via a pipe.
2. The microbial sand brick preparation device based on recycled materials according to claim 1, characterized in that, The grouting mold is a cylindrical or cuboid structure.
3. The microbial sand brick preparation device based on recycled materials according to claim 2, characterized in that, The top and bottom covers are provided with through holes, in which rubber plugs are embedded and installed, and connected to single-connector joints. The other end of the peristaltic pump pipe is connected to one end of the sand brick grouting mold and the other end of the pipe is connected to the sand brick grouting mold through single-connector joints.
4. The microbial sand brick preparation device based on recycled materials according to claim 2, characterized in that, The filter element is a double-layered gauze.
5. A method for preparing microbial sand bricks based on recycled materials, characterized in that, The microbial sand brick preparation apparatus based on recycled materials according to any one of claims 1-4 includes the following steps: Fill the mold with steel slag according to the target dry density and equal volume; Install the grouting mold and pipeline, and inject the bacterial solution at a flow rate of 2 mL / min using a peristaltic pump. The volume of the bacterial solution is 1.2 times the pore volume of the steel slag. After standing for 3 hours, the cementing solution was injected at a flow rate of 0.3–0.5 mL / min using a peristaltic pump. Repeat the steps 3 times, flipping the mold and changing the inlet / outlet after each grouting; After standing for 2 hours, the mold was removed, and the product was dried at 60 degrees Celsius. The soluble salts were then removed by washing with water to obtain microbial sand bricks.
6. The method for preparing microbial sand bricks based on recycled materials according to claim 5, characterized in that, The bacterial solution was a Bacillus pasteurellii solution with a concentration of 4.0 × 10⁻⁶. 8 –5.0×10 8 cells / mL.
7. The method for preparing microbial sand bricks based on recycled materials according to claim 6, characterized in that, The condensate is a mixture of 0.5 mol CaCl2 and an equimolar amount of urea.