CN112209670A - Method for making bricks by using biomass fly ash and furnace slag - Google Patents
Method for making bricks by using biomass fly ash and furnace slag Download PDFInfo
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- CN112209670A CN112209670A CN202011172233.1A CN202011172233A CN112209670A CN 112209670 A CN112209670 A CN 112209670A CN 202011172233 A CN202011172233 A CN 202011172233A CN 112209670 A CN112209670 A CN 112209670A
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- slag
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for making bricks by using biomass fly ash and furnace slag. The method utilizes the biomass fly ash and the furnace slag as raw materials, adopts a sintering-free process, realizes the resource utilization of waste, saves energy, has no pollution and has short manufacturing period. The method comprises the steps of subjecting slag and fly ash generated after biomass combustion to primary screening and primary magnetic separation, adding stones, crushing by a wet type sand blasting machine, and performing secondary magnetic separation and secondary screening to obtain a mixture; and mixing and stirring the mixture, cement, water and a cement reinforcing agent to obtain mortar, molding the mortar into bricks by using a hydraulic brick molding machine, and finally performing water spraying maintenance and natural maintenance. The invention realizes the resource utilization of the slag and the fly ash of the biomass power plant, relieves the ash treatment problem of the biomass power plant, simultaneously has no need of sintering, saves energy, has simple method, low cost and good economic benefit, and the produced brick has light weight, good thermal stability and small coefficient of thermal expansion.
Description
Technical Field
The invention relates to the technical field of resource utilization of general industrial waste building materials, and more particularly relates to a method for making bricks by using biological fly ash and slag.
Background
China is a big agricultural country, generates a large amount of agricultural and forestry wastes every year, causes great environmental pollution by direct incineration, and causes huge energy waste. In order to save energy and reduce environmental pollution, a large number of biomass power plants are established in various places of China. Biomass energy in China is rich, biomass power generation has wide development prospect, biomass energy is effectively and comprehensively utilized by utilizing biomass incineration power generation, and simultaneously, the generated flue gas is treated by a flue gas treatment system and is discharged after reaching the standard, so that the environmental pollution is reduced. But at the same time biomass power plants produce large amounts of slag and fly ash. The biomass power plant slag is solid residue formed by burning biomass fuel on a grate and is discharged from the bottom of a furnace, and is called slag. The fly ash of the biomass power plant is residue collected in a flue gas purification system and a heat recovery and utilization system of the biomass power plant.
At present, the common treatment mode of fly ash and slag is to directly bury the fly ash and scatter the fly ash into farmland as fertilizer or extract useful chemical components such as SiO 2 from ash slag.
In the prior art, direct landfill occupies a large amount of land, pollutes underground water and is not beneficial to environmental protection. The fertilizer may have insufficient fertilizer efficiency and the like. Meanwhile, in the transportation process, the secondary dust pollution is easily caused due to the low density of the biomass fly ash. The method for extracting chemical components such as SiO 2 from the biomass ash has higher cost and small treatment capacity.
In conclusion, the ash utilization rate of the biomass power plant is not high, and how to effectively treat a large amount of biomass ash and perform resource utilization on solid waste to achieve the treatment goals of harmlessness, reduction and resource utilization on slag and fly ash is a problem to be solved urgently, so that the social problems and the environmental pollution problems are greatly improved.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a method for making bricks by using biomass fly ash and slag, which comprises the following steps:
step 1: screening and sorting the slag and the biomass fly ash together, and sorting 2 types of the slag and the biomass fly ash which are larger than 4 mm and smaller than 4 mm;
step 2: carrying out magnetic separation on the separated biomass fly ash and slag with the thickness of more than 4 mm;
and step 3: crushing the biomass fly ash, the slag and the stone material subjected to magnetic separation;
and 4, step 4: carrying out secondary magnetic separation on the mixture obtained in the step 3;
and 5: carrying out secondary screening and sorting on the mixture subjected to the secondary magnetic separation;
step 6: carrying out secondary crushing on the mixture of the particles larger than 4 mm selected in the step 5;
and 7: mixing the particles separated from the step 1 and the step 5 and smaller than 4 mm;
and 8: and stirring the screened biomass fly ash, slag, cement, additives and stone powder in a stirrer, and then adding water for stirring.
And step 9: performing wheel milling on the mixture stirred in the step 8 for 3 minutes;
step 10: hydraulically pressing the mixture after wheel milling to prepare a formed brick;
step 11: and (3) carrying out water spraying maintenance on the formed brick prepared in the step (10), carrying out water spraying maintenance for 7 days, carrying out water spraying for 1-2 times every day, and then carrying out natural maintenance until 30 days.
In one embodiment of the present invention;
in step 1, unburnt material and slag with a particle size of more than 4 mm are separated by sieving.
In the step 2, the metal in the slag is recovered by magnetic separation, and the metal comprises iron, nickel and magnetic substances.
In the step 3, stone materials are added for wet crushing, and the proportion of the stone materials is (30-50)%.
In step 6, after secondary screening, the mixed particles larger than 4 mm are returned to secondary crushing.
In said step 7, the usable granules less than 4 mm after sieving are mixed.
In the step 8, the mass ratio of each raw material is as follows:
the biomass fly ash: the slag; the cement is as follows: the stone powder comprises the following components: the additive is (0-1): (3-7): (1-2.5): (3-5): (0-0.5);
the mass ratio of the mixture to the water is as follows:
mixing materials: water ═ 85-95: (5-15).
Stirring the mixture for 5 to 10 minutes, adding water and stirring for 5 to 10 minutes at the stirring temperature of 15 to 30 ℃;
in the step 9, the wheel milling time is 3 minutes.
In the step 10, the hydroforming pressure is 30 to 40 MPa.
In the step 11, the water spraying maintenance is carried out for 7 days, and water is sprayed for 1 to 2 times per day.
In the step 11, the natural curing is performed by natural drying in a ventilated environment, and the curing time is 23 days.
According to the method for making the brick by using the slag and the fly ash, provided by the invention, the biomass fly ash and the slag are used as raw materials, and a sintering-free process is adopted, so that the resource utilization of waste is realized, the energy is saved, no pollution is caused, and the manufacturing period is short. And the biomass ash slag brick prepared from the proportioned raw materials has good strength, and can be used for building municipal works, paving pedestrian roads, paving road shoulders, paving flower beds or flower beds and the like.
The invention provides a method for making bricks by taking biomass power plant ash as a raw material, which realizes resource utilization of the biomass power plant ash and fly ash, relieves the difficult problem of processing the biomass power plant ash.
Drawings
FIG. 1 is a process flow diagram of a method for making bricks by using biomass fly ash and slag.
The accompanying drawings are included to provide a further understanding of embodiments of the invention, and are incorporated in and constitute a part of this specification.
Detailed description of the embodiments
A method for making bricks using biomass fly ash and slag according to an embodiment of the present invention is described with reference to fig. 1 for further illustration.
As shown in fig. 1, a method for making bricks by using biomass fly ash and slag comprises the following steps:
step 1: and screening and sorting the biomass fly ash and the slag, and separating large unburnt substances and the slag. In one embodiment, in step 1, unburnt material and slag having a particle size greater than 4 mm are separated.
Step 2: and (3) carrying out magnetic separation on the slag processed in the step (1). In one embodiment, in step 2, the magnetic separation recovers the metals in the slag, and the metals include iron.
And step 3: adding 10% of water into the magnetically-separated biomass fly ash and slag, and then adding 30-50% of stone materials for wet crushing.
And 4, step 4: and (4) carrying out secondary magnetic separation on the mixture obtained in the step (3), wherein metals in the slag are recovered through the magnetic separation, and the metals comprise iron, nickel and magnetic substances.
And 5: and carrying out secondary screening and sorting on the mixture subjected to the secondary magnetic separation.
Step 6: and (5) carrying out secondary crushing on the mixture with the particles larger than 4 mm separated in the step 5.
And 7: mixing the granules separated in step 1 and step 5 and less than 4 mm.
And 8: stirring the screened biomass fly ash, slag, cement, additives and stone powder in a stirrer for 5 to 10 minutes, then adding water and stirring for 5 to 10 minutes at the stirring temperature of 15 to 30 ℃;
in the step 8, the mass ratio of each raw material is as follows:
the biomass fly ash: the slag; the cement is as follows: the stone powder comprises the following components: the additive is (0-1): (3-7): (1-2.5): (3-5): (0-0.5);
the mass ratio of the mixture to the water is as follows:
mixing materials: water ═ 85-95: (5-15).
Further, in the step 8, the biomass fly ash, the slag and the pebble obtained in the step 7 are added with cement and additives to be stirred in a stirrer for 5 to 10 minutes, then water is added to be stirred for 5 to 10 minutes, and the stirring temperature is 15 to 30 ℃ in the stirring process;
and step 9: performing wheel milling on the mixture stirred in the step 8 for 3 minutes;
step 10: hydraulically pressing the mixture after wheel milling to prepare a formed brick;
in the step 10, the molding pressure is 30 to 40 MPa;
step 11: and (3) carrying out water spraying maintenance on the formed brick prepared in the step (10), and then carrying out natural maintenance.
In one embodiment, in the step 11, the water spraying curing is performed for 7 days, and the water spraying curing is performed for 1-2 times every day within 7 days so as to facilitate the hardening of the brick body. And the natural curing is performed for up to 30 days after 7 days. Specifically, the natural curing is to place the bricks to stand and dry under natural ventilation conditions.
According to the process flow, the biomass fly ash and the slag are utilized to prepare the brick according to the following mass ratio: biomass fly ash: slag: : cement: stone powder: additive 0.5: 4.7: 1.5:3:0.3. The prepared brick has the average compressive strength of more than or equal to 15MPa, and can be used for constructing municipal works, paving pedestrian roads, paving road shoulders, paving flower beds or flower beds and the like.
The invention provides a method for making bricks by using fly ash and slag of a biomass power plant, which changes waste into valuable and solves the problem of ash disposal. Meanwhile, the invention provides a whole set of process flow for making bricks by using the fly ash and the slag of the biomass power plant, and bricks are made by using the fly ash and the slag of the biomass power plant from pretreatment to molding.
The method for making bricks by using the fly ash and the slag of the biomass power plant has the following beneficial effects: the biomass fly ash and the furnace slag are used as raw materials, so that the resource utilization of waste is realized; the preparation process does not cause pollution to the environment, and the preparation method is environment-friendly and has low cost; the sintering-free process is adopted, so that the energy is saved, no pollution is caused, and the manufacturing period is short; the metals are pretreated and recovered, so that the recycling of resources is realized; the sludge for cleaning the slag is mixed and then is used for making bricks together, so that the environment is not polluted; the biomass ash slag brick prepared from the proportioned raw materials has good strength (more than or equal to 15MPa), and can be used for constructing municipal engineering, paving pedestrian roads, paving road shoulders, paving flower beds or flower beds and the like.
Claims (11)
1. A method for making bricks by using biomass fly ash and slag, which comprises the following steps:
step 1: screening and sorting the slag and the biomass fly ash together, and sorting 2 types of the slag and the biomass fly ash which are larger than 4 mm and smaller than 4 mm;
step 2: carrying out magnetic separation on the separated biomass fly ash and slag with the thickness of more than 4 mm;
and step 3: crushing the biomass fly ash, the slag and the stone material subjected to magnetic separation;
and 4, step 4: carrying out secondary magnetic separation on the mixture obtained in the step 3;
and 5: carrying out secondary screening and sorting on the mixture subjected to the secondary magnetic separation;
step 6: carrying out secondary crushing on the mixture of the particles larger than 4 mm selected in the step 5;
and 7: mixing the particles separated from the step 1 and the step 5 and smaller than 4 mm;
and 8: stirring the screened biomass fly ash, slag, cement, additives and stone powder in a stirrer, and then adding water for stirring;
and step 9: performing wheel milling on the mixture stirred in the step 8;
step 10: hydraulically pressing the mixture after wheel milling to prepare a formed brick;
step 11: and (3) carrying out water spraying maintenance on the formed brick prepared in the step (10), and then carrying out natural maintenance.
2. The method of claim 1, wherein; in the step 8, the mass ratio of each raw material is as follows:
the biomass fly ash: the slag; the cement is as follows: the stone powder comprises the following components: the additive is (0-1): (3-7): (1-2.5): (3-5): (0-0.5);
the mass ratio of the mixture to the water is as follows:
mixing materials: water ═ 85-95: (5-15).
3. The method of claim 1, wherein; in said step 1, unburnt material and slag having a particle size of more than 4 mm are sieved.
4. The method of claim 1, wherein; in the step 2, the metal in the slag is recovered by magnetic separation, and the metal comprises iron, nickel and magnetic substances.
5. The method of claim 1, wherein; in step 3, (30-50)% of stone is added for crushing.
6. The method of claim 1, wherein; in step 5, the sieving results in usable mixture particles having a particle size of 4 mm and less than 4 mm.
7. The method of claim 1, wherein; in said step 6, the mixture particles larger than 4 mm are subjected to secondary crushing.
8. The method of claim 1, wherein; in the step 8, the biomass fly ash, the slag, the cement, the additive and the stone powder are stirred in a stirrer for 5 to 10 minutes, and then water is added to stir for 5 to 10 minutes, wherein the stirring temperature is the normal temperature of 15 to 30 ℃.
9. The method of claim 1, wherein; in step 9, the wheel is rolled for 3 minutes.
10. The method of claim 1, wherein; in the step 10, the molding pressure is 30 to 40 MPa.
11. The method of claim 1, wherein; in the step 11, the water spray curing is performed 1-2 times per day for 7 days, and the natural curing is performed to 30 days after 7 days.
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| CN202011172233.1A CN112209670A (en) | 2020-10-28 | 2020-10-28 | Method for making bricks by using biomass fly ash and furnace slag |
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| CN202011172233.1A CN112209670A (en) | 2020-10-28 | 2020-10-28 | Method for making bricks by using biomass fly ash and furnace slag |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213798A (en) * | 2021-06-10 | 2021-08-06 | 北京机械力化学研究院有限公司 | Waste incineration residue recycling system, fly ash bottom slag brick making and method thereof |
| CN113563035A (en) * | 2021-07-23 | 2021-10-29 | 上海市机电设计研究院有限公司 | Preparation method of biomass ash autoclaved baking-free brick |
| CN113651565A (en) * | 2021-08-25 | 2021-11-16 | 光大环保技术研究院（深圳）有限公司 | Brick making method and ash brick |
| CN113716919A (en) * | 2021-09-10 | 2021-11-30 | 国能生物发电集团有限公司 | Biomass ash-based steam-curing-free light foam concrete and preparation method thereof |
| CN115180914A (en) * | 2022-06-22 | 2022-10-14 | 上海市机电设计研究院有限公司 | Preparation method of biomass ash baking-free brick cured by boiler tail gas |
| CN115403326A (en) * | 2022-08-03 | 2022-11-29 | 上海市机电设计研究院有限公司 | Preparation method of high-doped biomass ash baking-free brick |
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| CA2953279A1 (en) * | 2014-06-06 | 2015-12-10 | Ascem B.V. | Cement compound and a method for the production thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113213798A (en) * | 2021-06-10 | 2021-08-06 | 北京机械力化学研究院有限公司 | Waste incineration residue recycling system, fly ash bottom slag brick making and method thereof |
| CN113563035A (en) * | 2021-07-23 | 2021-10-29 | 上海市机电设计研究院有限公司 | Preparation method of biomass ash autoclaved baking-free brick |
| CN113651565A (en) * | 2021-08-25 | 2021-11-16 | 光大环保技术研究院（深圳）有限公司 | Brick making method and ash brick |
| CN113716919A (en) * | 2021-09-10 | 2021-11-30 | 国能生物发电集团有限公司 | Biomass ash-based steam-curing-free light foam concrete and preparation method thereof |
| CN115180914A (en) * | 2022-06-22 | 2022-10-14 | 上海市机电设计研究院有限公司 | Preparation method of biomass ash baking-free brick cured by boiler tail gas |
| CN115403326A (en) * | 2022-08-03 | 2022-11-29 | 上海市机电设计研究院有限公司 | Preparation method of high-doped biomass ash baking-free brick |
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