CN116003112A - Brick making process based on gneiss tailings - Google Patents
Brick making process based on gneiss tailings Download PDFInfo
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- CN116003112A CN116003112A CN202211599674.9A CN202211599674A CN116003112A CN 116003112 A CN116003112 A CN 116003112A CN 202211599674 A CN202211599674 A CN 202211599674A CN 116003112 A CN116003112 A CN 116003112A
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- 239000011449 brick Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 41
- 238000001035 drying Methods 0.000 claims description 48
- 239000004927 clay Substances 0.000 claims description 24
- 238000007873 sieving Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- 238000011068 loading method Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 239000012258 stirred mixture Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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Abstract
The invention provides a process for making bricks based on gneiss tailings, which utilizes gneiss tailings as raw materials to prepare sintered bricks, not only can realize the reduction of gneiss tailings, but also can realize the secondary utilization of wastes to the maximum extent, and provides an effective way for the resource utilization of gneiss tailings, thereby effectively relieving the huge pressure faced by economic construction and ecological environment in China. The invention optimizes the brick making process on the basis of taking the gneiss tailings as raw materials, and the prepared brick has the characteristics of heat resistance, heat insulation, flame retardance, firmness and durability.
Description
Technical Field
The invention relates to the technical field of brick making, in particular to a brick making process based on gneiss tailings.
Background
Since the 21 st century, the development of the infrastructure construction in China has been rapid, and many projects such as mountain houses and roads are started to be constructed on a large scale, which also causes the increasing number of gneiss tailings. According to the latest investigation, only mining enterprises in China generate tailings of about 26.5 parts per million per year in recent years, the comprehensive recovery utilization amount is 18 parts per million, the comprehensive recovery utilization rate is only 6.95%, and the occupation area of a tailings pond is up to 37282Km 2 。
The stone material is produced in large scale in China, and the stone material can be directly applied to engineering by local materials, so that the stone material is convenient and the cost is saved. However, the mineral stone is not known enough in China, the utilization rate of the mineral stone is not high, and most of the mineral stone is treated as waste slag, so that the engineering economic benefit is reduced, and a plurality of problems are brought. Such as environmental pollution, occupation of a large amount of land resources, potential safety hazard of a tailing dam, maintenance cost of the tailing dam, and the like, are also receiving more and more attention. The direct consequence of tailings is that a large amount of reusable resources cannot be reused, and the environmental problem is more serious, so that the treatment of tailings is an important environmental problem to be solved in various countries.
The tailings have a plurality of valuable mineral resources, so that the valuable mineral resources are effectively developed as important components for comprehensive utilization of the mineral resources, and the tailings are an important way for saving and utilizing the mineral resources. Whether mineral resources can be effectively and reasonably utilized is related to the future direction of social economy and also determines the development of human society, so that the reasonable development and effective treatment of tailing resources are urgent at present.
Disclosure of Invention
The invention aims at solving the problems of unreasonable application of the existing gneiss tailings, and environmental safety caused by accumulation, occupation of land and the like, and provides a gneiss tailings-based brick making process, which utilizes gneiss tailings as raw materials to prepare a sintered brick, so that the reduction of gneiss tailings can be realized, the reutilization of wastes can be realized to the greatest extent, and an effective way is provided for the recycling of gneiss tailings.
In a first aspect, the invention relates to a process for making bricks based on gneiss tailings, comprising the following steps:
s1: crushing, sieving and drying gneiss tailings and clay respectively, weighing according to a set raw material proportion, and mixing the two raw materials in a dry state to prepare a blank for later use;
s2: adding water into the blank obtained in the step S1, uniformly stirring and aging to obtain a mixture;
s3: pressing and molding the mixture obtained in the step S2 to obtain a molded wet green brick;
s4: drying the formed wet green bricks obtained in the step S3 to obtain dry green bricks;
s5: and (3) roasting the dried green bricks obtained in the step (S4), and naturally cooling to room temperature after roasting to obtain finished products.
Preferably, in the step S1, the mass ratio of the gneiss tailings to the clay is (75-65): (25-35).
Preferably, in the step S2, the water is added in an amount of 8-15% of the mass of the blank, and the blank is aged for at least 24 hours in a sealing way.
Preferably, in the step S3, the conditions of the press forming are as follows:
the loading rate is 5-10 KN/s, the molding pressure is 10-15 MPa, and the pressure is maintained for 10-15 s.
Preferably, in the step S4, the drying temperature is greater than 100 ℃ and the drying time is 10-12 hours.
Preferably, in the step S5, the conditions for firing are as follows:
the sintering temperature is 900-1100 ℃, the heat preservation time is 2-3 h, and the heating rate is 3-7 ℃/min.
Preferably, in the step S1, the specific processes of crushing, sieving and drying are as follows:
grinding gneiss tailings and clay for 3-5 min by a grinder, sieving by a sieve with a mesh not more than 48 meshes, and drying for 2-4 hours at a temperature higher than 100 ℃ after sieving.
In a second aspect, the invention relates to a sintered brick prepared by the process for making bricks based on gneiss tailings.
Preferably, the compressive strength of the sintered brick is 28-38 MPa.
In a third aspect, the invention relates to the use of gneiss tailings in the manufacture of a sintered brick.
According to the technical scheme, the brick making process based on the gneiss tailings provided by the invention utilizes the gneiss tailings as raw materials to prepare the sintered brick, so that the reduction of the gneiss tailings can be realized, the secondary utilization of wastes can be realized to the greatest extent, an effective way is provided for the recycling utilization of the gneiss tailings, and the huge pressure faced by economic construction and ecological environment in China is effectively relieved.
The brick making process of the invention uses less clay as raw materials to prepare the baked brick, thereby greatly reducing the utilization rate of non-renewable resources and effectively protecting clay resources.
The brick prepared by the brick making process has the characteristics of heat resistance, heat insulation and flame retardance, and the brick making process can be used for producing the brick with higher compressive strength by using smaller forming pressure and shorter time compared with the prior art, and the compressive strength can reach 30MPa, and is firm and durable.
Drawings
Fig. 1 is a flow chart of the gneiss tailing-based brickmaking process of the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a wide variety of ways.
At present, the gneiss tailing has low utilization rate and single treatment means, and the main research at present is divided into two directions: 1. material applications of gneiss tailings, as a substitute for limestone fillers, as a viscosity enhancer, and the like; 2. engineering applications of gneiss tailings, addition to concrete for use as reinforcing agents, and the like.
Therefore, a large amount of gneiss tailing resources are wasted, the resources are not reasonably utilized, and the environment safety problem is caused by accumulation of gneiss tailings and occupation of land.
Therefore, the brick making process based on the gneiss tailings utilizes the gneiss tailings as raw materials to prepare the sintered bricks, so that the reduction of the gneiss tailings can be realized, the secondary utilization of wastes can be realized to the greatest extent, and an effective way is provided for the recycling utilization of the gneiss tailings.
In a preferred embodiment of the invention, there is provided a process for making bricks based on gneiss tailings, comprising the steps of:
s1: crushing, sieving and drying gneiss tailings and clay respectively, weighing according to a set raw material proportion, and mixing the two raw materials in a dry state to prepare a blank for later use;
s2: adding water into the blank obtained in the step S1, uniformly stirring and aging to obtain a mixture;
s3: pressing and molding the mixture obtained in the step S2 to obtain a molded wet green brick;
s4: drying the formed wet green bricks obtained in the step S3 to obtain dry green bricks;
s5: and (3) roasting the dried green bricks obtained in the step (S4), and naturally cooling to room temperature after roasting to obtain finished products.
In a preferred embodiment, in the step S1, the mass ratio of the gneiss tailings to the clay is (75-65) (25-35).
In a preferred embodiment, in the step S2, water is added in an amount of 8% -15% of the mass of the blank, and the blank is aged for at least 24 hours in a sealing manner.
In a preferred embodiment, in the step S3, the conditions for press molding are as follows:
the loading rate is 5-10 KN/s, the molding pressure is 10-15 MPa, and the pressure is maintained for 10-15 s.
In a preferred embodiment, in the step S4, the drying temperature is greater than 100 ℃ and the drying time is 10 to 12 hours.
In a preferred embodiment, in the step S5, the conditions for firing are as follows:
the sintering temperature is 900-1100 ℃, the heat preservation time is 2-3 h, and the heating rate is 3-7 ℃/min.
In another preferred embodiment, the temperature is kept for 1h when the temperature is raised to 260 ℃ during the heating process, and is kept for 1h after the temperature is continuously raised to 600 ℃ and then is continuously raised to the temperature required for sintering.
Since the crystallization water and the organic matter start to decompose during the temperature of 260 ℃ to 600 ℃; so that the temperature is kept for 1 hour at 260 ℃ and 600 ℃ respectively, the gas volatilization is convenient for material decomposition, the porosity of the baked product is reduced, and the strength and the density of the brick are increased. And then, continuously heating to the final sintering temperature and preserving heat to fully react the raw materials to obtain the finished brick.
In a preferred embodiment, in the step S1, the specific processes of crushing, sieving and drying are as follows:
grinding gneiss tailings and clay for 3-5 min by a grinder, sieving by a sieve with a mesh not more than 48 meshes, and drying for 2-4 hours at a temperature higher than 100 ℃ after sieving.
In one exemplary embodiment, a process for making bricks based on gneiss tailings is provided, which specifically comprises the following steps:
step one: grinding the gneiss tailings and clay for 3min by using a grinder, and then sieving with a screen with a mesh not more than 48 meshes, wherein the smaller granularity can enable the interior of the gneiss tailings sintered brick to be more compact, thereby improving the strength of the sintered brick; drying the two screened raw materials in a constant temperature drying oven at a temperature of more than 100 ℃ for 2-4 hours to remove water in the raw materials, wherein after the drying is finished, the raw materials are mixed according to the set raw material ratio (%): gneiss tailings: clay = 75-65: 25 to 35, and is accurately weighed, stirred and uniformly mixed to prepare a blank for standby.
Step two: adding tap water with the mass fraction of 8% -15% into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: drying the pressed wet green bricks in a constant temperature drying oven at a temperature of more than 100 ℃ for 10-12 hours to remove water in the wet green bricks and strengthen the green bricks.
Step five: the dried green bricks are put into a high-temperature electric furnace for roasting, and the temperature is kept for 2 hours after the temperature is increased to 900-1100 ℃ at the heating rate of 3-7 ℃/min, so that the raw materials fully react. Wherein the temperature is kept at 260 ℃ and 600 ℃ for 1h.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
In another preferred embodiment of the present invention, there is provided a sintered brick prepared by the aforementioned gneiss tailing-based brick making process.
In a preferred embodiment, the compressive strength of the sintered brick is 28 to 38MPa.
In another preferred embodiment of the invention, there is also provided the use of gneiss tailings in the manufacture of a sintered brick.
The invention successfully prepares the sintered brick by taking the gneiss tailings as the raw material, not only can realize the reduction of the gneiss tailings, but also can maximally realize the secondary utilization of wastes, and optimizes the brick making process on the basis of taking the gneiss tailings as the raw material, thereby obtaining the brick with the characteristics of heat resistance, heat insulation, flame retardance, firmness and durability.
The invention will be further illustrated with reference to the following examples, which are intended to illustrate the invention and not to limit it further.
The ingredients of the gneiss tailings used in the following examples are shown in table 1, with the clay being shale.
TABLE 1
Example 1
Step one: grinding gneiss tailings and clay for 3min by using a grinder, sieving with a 48-mesh sieve, drying the two sieved raw materials in a constant-temperature drying oven at 105 ℃ for 2 hours, and after the drying, mixing the raw materials according to the ratio (%): gneiss tailings: clay=70:30, and is accurately weighed and stirred to be mixed uniformly, and made into a blank for standby.
Step two: adding tap water with the mass percent of 10% into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: and drying the pressed wet green bricks in a constant temperature drying oven at 105 ℃ for 10 hours to remove the moisture in the wet green bricks and strengthen the green bricks.
Step five: and (3) placing the dried green bricks into a high-temperature electric furnace for roasting, raising the temperature to the sintering temperature of 1050 ℃ at a heating rate of 5 ℃/min, and then preserving the heat for 2 hours to enable the raw materials to fully react. Wherein the temperature is kept at 260 ℃ and 600 ℃ for 1h.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
Example 2
Step one: grinding gneiss tailings and clay for 3min by using a grinder, sieving with a 48-mesh sieve, drying the two sieved raw materials in a constant-temperature drying oven at 105 ℃ for 2 hours, and after the drying, mixing the raw materials according to the ratio (%): gneiss tailings: clay=75:25, and is accurately weighed and stirred to be mixed well, and made into a blank for standby.
Step two: adding tap water with the mass fraction of 11% into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: and drying the pressed wet green bricks in a constant temperature drying oven at 110 ℃ for 11 hours to remove the moisture in the wet green bricks and strengthen the green bricks.
Step five: and (3) placing the dried green bricks into a high-temperature electric furnace for roasting, and raising the temperature to the sintering temperature of 1000 ℃ at a heating rate of 6 ℃/min, and then preserving the heat for 2 hours to enable the raw materials to fully react. Wherein the temperature is kept at 260 ℃ and 600 ℃ for 1h.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
Example 3
Step one: grinding gneiss tailings and clay for 3min by using a grinder, sieving with a 48-mesh sieve, drying the two sieved raw materials in a constant-temperature drying oven at 110 ℃ for 3 hours, and after the drying, mixing the raw materials according to the ratio (%): gneiss tailings: clay=70:30, and is accurately weighed and stirred to be mixed uniformly, and made into a blank for standby.
Step two: adding tap water with the mass fraction of 9% into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: and drying the pressed wet green bricks in a constant temperature drying oven at 105 ℃ for 12 hours to remove the moisture in the wet green bricks and strengthen the green bricks.
Step five: and (3) placing the dried green bricks into a high-temperature electric furnace for roasting, and after the temperature is raised to the sintering temperature of 950 ℃ at a heating rate of 4 ℃/min, preserving the heat for 2 hours to enable the raw materials to fully react. Wherein the temperature is kept at 260 ℃ and 600 ℃ for 1h.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
Example 4
Step one: grinding gneiss tailing and clay for 3min by using a grinder, sieving with a 48-mesh sieve, drying the two sieved raw materials in a constant-temperature drying oven at 110 ℃ for 4 hours, and after the drying, mixing the raw materials according to the ratio (%): gneiss tailings: clay=75:25, and is accurately weighed and stirred to be mixed well, and made into a blank for standby.
Step two: adding tap water with the mass fraction of 12% into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: and drying the pressed wet green bricks in a constant temperature drying oven at 105 ℃ for 10 hours to remove the moisture in the wet green bricks and strengthen the green bricks.
Step five: and (3) placing the dried green bricks into a high-temperature electric furnace for roasting, and raising the temperature to the sintering temperature of 1100 ℃ at the heating rate of 7 ℃/min, and then preserving the heat for 2 hours to enable the raw materials to fully react. Wherein the temperature is kept at 260 ℃ and 600 ℃ for 1h.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
Example 5
Step one: grinding gneiss tailings and clay for 3min by using a grinder, sieving with a 48-mesh sieve, drying the two sieved raw materials in a constant-temperature drying oven at 105 ℃ for 2 hours, and after the drying, mixing the raw materials according to the ratio (%): gneiss tailings: clay=65:35, and is accurately weighed and stirred to be mixed uniformly, and made into a blank for standby.
Step two: adding tap water with 15% of mass fraction into the uniformly mixed raw materials and stirring; and sealing the uniformly stirred mixture by using a plastic bag, and aging for 24 hours at room temperature to fully react the mixture.
Step three: placing the aged blank into a formulated mould (specification: 240mm multiplied by 115mm multiplied by 53 mm), placing the blank into the mould for 5 times, layering, manually vibrating, covering a mould cover plate, and using an electrohydraulic servo pressure tester for static pressure forming, wherein the loading rate during forming is 5KN/s, the forming pressure is 10MPa, and the dwell time is 10s.
Step four: and drying the pressed wet green bricks in a constant temperature drying oven at 105 ℃ for 12 hours to remove the moisture in the wet green bricks and strengthen the green bricks.
Step five: and (3) placing the dried green bricks into a high-temperature electric furnace for roasting, and raising the temperature to 900 ℃ at a heating rate of 3 ℃/min, and then preserving the heat for 2 hours to enable the raw materials to fully react.
Step six: and automatically cooling the baked green bricks to room temperature in a furnace to obtain finished products.
Testing
The bricks obtained in examples 1 to 5 were subjected to compressive strength test, and the results are shown in Table 2.
TABLE 2
Compared with the prior art, the invention has the advantages of smaller molding pressure and shorter overall brick making time, but the produced brick has higher compressive strength.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. The brickmaking process based on gneiss tailings is characterized by comprising the following steps of:
s1: crushing, sieving and drying gneiss tailings and clay respectively, weighing according to a set raw material proportion, and mixing the two raw materials in a dry state to prepare a blank for later use;
s2: adding water into the blank obtained in the step S1, uniformly stirring and aging to obtain a mixture;
s3: pressing and molding the mixture obtained in the step S2 to obtain a molded wet green brick;
s4: drying the formed wet green bricks obtained in the step S3 to obtain dry green bricks;
s5: and (3) roasting the dried green bricks obtained in the step (S4), and naturally cooling to room temperature after roasting to obtain finished products.
2. The gneiss tailing based brickmaking process of claim 1, wherein in the step S1, the mass ratio of gneiss tailings to clay is (75-65): (25-35).
3. The gneiss tailing based brick making process according to claim 1, wherein in the step S2, water is added in an amount of 8% -15% of the mass of the blank, and the blank is aged for at least 24 hours in a sealing manner.
4. The process for producing bricks based on gneiss tailings according to claim 1, wherein in the step S3, the conditions of the press forming are as follows:
the loading rate is 5-10 KN/s, the molding pressure is 10-15 MPa, and the pressure is maintained for 10-15 s.
5. The process for making bricks based on gneiss tailings according to claim 1, wherein in the step S4, the drying temperature is higher than 100 ℃ and the drying time is 10 to 12 hours.
6. The process for producing bricks based on gneiss tailings according to claim 1, wherein in the step S5, the condition of calcination is as follows:
the sintering temperature is 900-1100 ℃, the heat preservation time is 2-3 h, and the heating rate is 3-7 ℃/min.
7. The process for making bricks based on gneiss tailings according to any one of claims 1 to 6, wherein in step S1, the specific processes of crushing, sieving and drying are as follows:
grinding gneiss tailings and clay for 3-5 min by a grinder, sieving by a sieve with a mesh not more than 48 meshes, and drying for 2-4 hours at a temperature higher than 100 ℃ after sieving.
8. A sintered brick produced by the gneiss tailing-based brick making process according to any one of claims 1 to 7.
9. The baked brick of claim 8, wherein the baked brick has a compressive strength of 28 to 38MPa.
10. Use of gneiss tailings in the preparation of sintered bricks.
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