CN117381936A - Device and method for producing concrete building blocks by utilizing low-pressure superheated steam - Google Patents
Device and method for producing concrete building blocks by utilizing low-pressure superheated steam Download PDFInfo
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- CN117381936A CN117381936A CN202311530389.6A CN202311530389A CN117381936A CN 117381936 A CN117381936 A CN 117381936A CN 202311530389 A CN202311530389 A CN 202311530389A CN 117381936 A CN117381936 A CN 117381936A
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- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 75
- 230000008569 process Effects 0.000 claims abstract description 67
- 239000004568 cement Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 42
- 239000002002 slurry Substances 0.000 claims description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
- 210000003437 trachea Anatomy 0.000 claims description 22
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 18
- 239000004571 lime Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 16
- 239000011268 mixed slurry Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000010440 gypsum Substances 0.000 claims description 6
- 229910052602 gypsum Inorganic materials 0.000 claims description 6
- 239000002918 waste heat Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000011449 brick Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a device for producing concrete blocks by utilizing low-pressure superheated steam, which comprises an autoclave, a vacuumizing air separating cylinder, a slow air separating cylinder, an air pouring air separating cylinder and an air collecting air separating cylinder which are sequentially connected, wherein the vacuumizing air separating cylinder and the air collecting air separating cylinder are connected with the autoclave, the air pouring air separating cylinder is connected with other autoclaves, the air collecting air separating cylinder and the air pouring air separating cylinder are respectively connected with external low-pressure superheated steam, the production method comprises the five steps of raw material treatment, batch casting, stationary maintenance, blank cutting and autoclaved maintenance, the autoclaved maintenance needs to be subjected to vacuumizing, heating and boosting, constant temperature and constant pressure, cooling and depressurizing, and when the temperature is lagging by the steam which is discharged into other autoclaves in the process of heating and boosting, the low-pressure superheated steam of a cement plant is introduced into the autoclaves until the pressure of the two autoclaves is balanced after the temperature is matched with the pressure, and finally the high-temperature saturated steam is introduced and the steam is continuously heated to a threshold value, so that the production quality of aerated concrete blocks is improved.
Description
Technical Field
The invention relates to the technical field of concrete block processing, in particular to a device and a method for producing concrete blocks by utilizing low-pressure superheated steam.
Background
The aerated brick is the autoclaved aerated concrete block, and is produced by a high-temperature autoclaved equipment process, the autoclaved curing device of the aerated brick is mainly carried out by an autoclave, and the aerated brick is cured by introducing high-temperature high-pressure steam into the autoclave, and simultaneously carrying out four processes of vacuumizing, heating up and boosting, constant temperature and pressure, cooling and reducing pressure according to the process requirements.
The steam used in the process of heating up and boosting up the curing of the aerated bricks is saturated steam, the production cost is considered in the actual factory production process, other steam in the autoclaved kettles needing pressure relief is poured into the kettles needing heating up and boosting up, so that the steam use efficiency can be improved, but the water content of the poured steam in other kettles is high and does not reach the quality of the saturated steam, the phenomenon that the pressure is increased and the temperature is difficult to rise in the heating up and boosting up process, the pressure and the temperature are not matched, and particularly, the pressure is quite common in the period of 0.1-0.6 MPa;
even if saturated steam is used for heating and boosting, the surfaces of a kettle body, a steam curing trolley and a green body which are relatively low in temperature exchange with the saturated steam to generate a large amount of condensed water, the phenomena of pressure rise, temperature non-rise or difficult rise can occur, the phenomenon of mismatching of the pressure and the temperature caused by any reason can easily cause the strength reduction of the building block, and even the phenomenon of generating cores inside the building block is not caused by the steam of the building block.
For this purpose, we propose a device and a method for producing concrete blocks using low pressure superheated steam to solve the above problems.
Disclosure of Invention
Therefore, the invention provides a device and a method for producing concrete blocks by utilizing low-pressure superheated steam, which solve the defects in the prior art.
The utility model provides an utilize device of low pressure superheated steam production concrete block, includes still kettle, the evacuation branch cylinder that connects in order, slow gas branch cylinder, fall gas branch cylinder and gas collection branch cylinder, the evacuation branch cylinder and gas collection branch cylinder all through the trachea with still kettle connection, fall gas branch cylinder with others evaporate and press between the kettle through first gas tube connection, gas collection branch cylinder passes through the external low pressure superheated steam of second tracheal connection, second tracheal air outlet end one side is provided with first pneumatic valve, slow gas branch cylinder and fall gas branch cylinder between connect through the fourth trachea, be provided with the third pneumatic valve on the fourth trachea, fall gas branch cylinder and gas collection branch cylinder between connect through the fifth trachea, be provided with the fourth pneumatic valve on the fifth trachea, gas collection branch cylinder is being connected with high temperature high pressure saturated steam through the sixth trachea, be provided with the fifth pneumatic valve on the sixth trachea.
Preferably, the externally connected low pressure superheated steam is derived from waste heat of cement provided by the cement plant.
A production method for producing concrete blocks by utilizing low-pressure superheated steam comprises the following steps:
s100, raw material treatment:
preparing block slurry from quartz sand tailings, desulfurized gypsum and waste slurry according to mass proportions, and preparing lime powder, cement and aluminum powder slurry;
s200, pouring ingredients:
weighing the block slurry, lime powder, cement and aluminum powder slurry according to a proportion into a weighing container, sequentially injecting the raw materials into a stirrer to stir to form mixed slurry, introducing low-pressure steam in the process, injecting the mixed slurry into a mould vehicle, and completing batch casting;
s300, standing and maintaining:
the mould vehicle injected with the mixed slurry is transported to a static stop room by a ferry vehicle for maintenance, and the mixed slurry is changed into a green body with cutting conditions through the processes of gas generation, thickening and hardening;
s400, cutting a blank: cutting the blank with the cutting hardness into various sizes, and grouping into an autoclave;
s500, autoclaved curing: the blank body enters the autoclave and needs to undergo four processes, namely a vacuumizing process, a heating and boosting process, a constant temperature and constant pressure process and a cooling and depressurization process;
wherein, the temperature rise and the pressure rise process are as follows: saturated steam is introduced for 1.5-2.5 hours, the pressure in the kettle is increased to 1.1-1.3MPa, the temperature reaches 184-191 ℃, the speed of the heating and boosting process is slow before and fast after, and the specific process is as follows:
pouring steam decompressed by other autoclaves into the autoclave 10 to raise the temperature of the autoclave 10; stopping pressure relief of other autoclaves when the temperature lag pressure condition occurs in the autoclave 10, especially in the period of 0.1-0.6MPa, and introducing low-pressure superheated steam into the autoclave 10, wherein the pressure of the low-pressure superheated steam can be cement waste heat provided by a cement plant and is 0.5-0.7MPa, the temperature is 280-320 ℃, the temperature in the autoclave 10 can be slowly increased in the inflation process until the temperature is matched with the pressure, stopping introducing the low-pressure superheated steam, introducing high-temperature saturated steam, continuously heating and boosting to 1.1-1.3MPa, and the temperature is 184-191 ℃, and the autoclave enters a constant-temperature and constant-pressure state.
Preferably, in step S100, the lime powder is lime powder with the screen residue of less than 15% of square hole screen with fineness of 0.08mm ground by a ball mill; the cement adopts 42.5 ordinary Portland cement; the gas generating material is aluminum powder paste, and the aluminum powder paste and water are prepared into aluminum powder slurry.
Preferably, in step S200, the block slurry is injected into the mixer for mixing, then the cement and the lime powder are injected into the mixer for mixing for 60S, then low-pressure steam is introduced, when the temperature of the slurry mixed in the mixer reaches 35 ℃, the steam is stopped, when the temperature of the slurry mixed in the mixer reaches 40 ℃, the aluminum powder slurry is injected, and after the aluminum powder slurry is stirred in the mixer for 30S, the mixed slurry is completely injected into the mold vehicle.
Preferably, in step S100, the mass ratio of the raw materials is: 65-75 parts of quartz sand tailings and 12-16 parts of lime; 13-18 parts of cement, 2-4 parts of desulfurized gypsum and 5-8 parts of waste slurry; 0.1-0.15 part of aluminum powder.
Preferably, the whole process of step S300 takes 2 hours, and the static room environment is kept at a temperature of 40-55 ℃ and a humidity of 0.7-0.9.
Preferably, the vacuum pumping process of step S500: and vacuumizing the autoclave by using a vacuum pump, discharging most of air in the autoclave and part of air in the blank body to form a negative pressure state, and vacuumizing to-0.06 MPa in the whole process for 20-30 minutes.
Preferably, the constant temperature and constant pressure process of step S500: the central part of the blank body in the process has a small amount of part which does not reach the constant temperature, reaches the temperature consistent with the outer layer in the early stage of the constant temperature stage, the blank body in the whole process fully carries out hydrothermal synthesis reaction to generate enough hydration products and reach the necessary crystallinity, the blank body is converted into a finished product, good performance is obtained, the pressure in the process is 1.1-1.3MPa, the temperature reaches 184-191 ℃, and the temperature is kept for 5-9 hours.
Preferably, the temperature and pressure reducing process in step S500: after the constant temperature and the constant pressure are finished, a steam pouring valve is opened to pour steam, and when the pressure in the kettle is released to 0.3MPa, a pressure release valve is opened to release the pressure in full force.
The invention has the following advantages:
according to the invention, through the cooperation among the autoclaved kettle, the vacuumizing branch cylinder, the slow gas branch cylinder, the gas pouring branch cylinder, the gas collecting branch cylinder and various valves which are sequentially connected, in the heating and boosting process of the autoclaved curing link of producing the aerated concrete block, the low-pressure superheated steam of the residual heat of the cement provided by other autoclaved kettles and the cement factory is blended, so that the heating and boosting process speed is slow before and after, and the pressure and temperature are kept to be matched, thereby improving the production quality of the aerated concrete block and improving the utilization rate of energy sources.
Drawings
Fig. 1 is a schematic diagram of the connection structure of the device of the present invention.
In the figure:
1-vacuumizing a sub-cylinder; 2-slow gas separation cylinder; 3-air pouring and separating cylinder; 4-gas collecting and separating cylinders; 5-a first trachea; 6-a second trachea; 8-a first air valve; 10-an autoclave; 11-a fifth trachea; 12-a fourth air valve; 13-fourth trachea; 14-a third air valve; 15-sixth trachea; 16-fifth air valve.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1, the invention provides a device for producing concrete blocks by using low-pressure superheated steam, which comprises an autoclave 10, a vacuumizing air separating cylinder 1, a slow air separating cylinder 2, an air pouring air separating cylinder 3 and an air collecting air separating cylinder 4 which are sequentially connected, wherein the vacuumizing air separating cylinder 1 and the air collecting air separating cylinder 4 are connected with the autoclave 10 through air pipes, the air pouring air separating cylinder 3 is connected with other autoclaves 10 through a first air pipe 5, the air collecting air separating cylinder 4 is connected with external low-pressure superheated steam through a second air pipe 6, and the external low-pressure superheated steam is from cement waste heat provided by a cement plant. The gas collecting and separating cylinder 4 is communicated with high-temperature high-pressure saturated steam through a sixth air pipe 15, and a fifth air valve 16 is arranged on the sixth air pipe 15.
The air outlet end of the second air pipe 6 is provided with a first air valve 8, the slow air separating cylinder 2 and the air pouring separating cylinder 3 are connected through a fourth air pipe 13, a third air valve 14 is arranged on the fourth air pipe 13, the air pouring separating cylinder 3 and the air collecting separating cylinder 4 are connected through a fifth air pipe 11, and a fourth air valve 12 is arranged on the fifth air pipe 11.
A method for producing concrete blocks by utilizing low-pressure superheated steam comprises the steps of raw material treatment, batching casting, static curing, blank cutting and autoclaved curing. Specific:
s100, raw material treatment:
and preparing the block slurry from quartz sand tailings, desulfurized gypsum and waste slurry according to the mass ratio, and preparing lime powder, cement and aluminum powder slurry.
The lime powder is lime powder with the screen residue of less than 15% of square hole screen with the fineness of 0.08mm ground by a ball mill;
the cement adopts 42.5 ordinary Portland cement;
the gas generating material is aluminum powder paste, and the aluminum powder paste and water are prepared into aluminum powder slurry.
The mass ratio of the raw materials is as follows: 65-75 parts of quartz sand tailings and 12-16 parts of lime; 13-18 parts of cement, 2-4 parts of desulfurized gypsum and 5-8 parts of waste slurry; 0.1-0.15 part of aluminum powder.
S200, pouring ingredients:
weighing the block slurry, lime powder, cement and aluminum powder slurry according to a proportion, putting the block slurry into a weighing container, firstly injecting the block slurry into a stirrer for stirring, then injecting the cement and the lime powder into the stirrer for stirring for 60 seconds, then introducing low-pressure steam, stopping introducing the steam when the temperature of the slurry mixed in the stirring tank reaches 35 ℃, injecting the aluminum powder slurry when the temperature of the slurry mixed in the stirring tank reaches 40 ℃, and fully injecting the mixed slurry into a mould vehicle after the aluminum powder slurry is stirred for 30 seconds in the stirring tank, thereby completing the pouring of ingredients;
s300, standing and maintaining:
the mould vehicle injected with the mixed slurry is transported to a static stop room for maintenance by a ferry vehicle, and the mixed slurry is changed into a green body with cutting conditions through the processes of gas generation, thickening and hardening.
The whole process requires 2 hours, and the static room environment keeps the temperature between 40 and 55 ℃ and the humidity between 0.7 and 0.9.
S400, cutting a blank: cutting the blank with the cutting hardness into various sizes, and grouping into an autoclave.
S500, autoclaved curing: the blank body enters the autoclave and needs to undergo four processes, namely a vacuumizing process, a heating and boosting process, a constant temperature and constant pressure process and a cooling and depressurization process.
Wherein, the vacuum pumping process uses a vacuum pump to vacuumize the autoclave, most of air in the autoclave and part of air in the blank are discharged to form a negative pressure state, and the whole process is pumped to 0.06MPa for 20-30 minutes.
Wherein, the temperature rise and the pressure rise process are as follows: saturated steam is introduced for 1.5-2.5 hours, the pressure in the kettle is increased to 1.1-1.3MPa, the temperature reaches 184-191 ℃, the speed of the heating and boosting process is slow before and fast after, and the specific process is as follows:
pouring steam decompressed by other autoclaves into the autoclave 10 to raise the temperature of the autoclave 10; stopping pressure relief of other autoclaves when the temperature lag pressure condition occurs in the autoclave 10, especially in the period of 0.1-0.6MPa, and introducing low-pressure superheated steam into the autoclave 10, wherein the pressure of the low-pressure superheated steam can be cement waste heat provided by a cement plant and is 0.5-0.7MPa, the temperature is 280-320 ℃, the temperature in the autoclave 10 can be slowly increased in the inflation process until the temperature is matched with the pressure, stopping introducing the low-pressure superheated steam, introducing high-temperature saturated steam, continuously heating and boosting to 1.1-1.3MPa, and the temperature is 184-191 ℃, and the autoclave enters a constant-temperature and constant-pressure state.
In the embodiment of the invention, in order to improve the utilization rate of energy, the first air valve 8, the third air valve 14 and the fifth air valve 16 are closed, the fourth air valve 12 is opened, and the vapor discharged from the other autoclaves 10 through decompression is distributed into the autoclaves 10 through the gas pouring and separating cylinder 3 and the gas collecting cylinder 4.
When the temperature lag pressure occurs in the autoclave 10, particularly during the period of 0.1-0.6MPa, the fourth air valve 12 is closed, the first air valve 8 and the third air valve 14 are opened, at the moment, low-pressure overheated steam externally connected with a cement plant enters the autoclave 10 through the gas collecting and separating cylinder 4, the temperature and the pressure in the autoclave 10 can be gradually increased in the process of inflation, and the temperature and the pressure are gradually matched. Meanwhile, the steam decompressed by the other autoclaves 10 enters the slow air separation cylinder 2 from the air pouring separation cylinder 3 for temporary storage so as to be utilized, thereby improving the utilization rate of energy sources.
If the pressure in the autoclave 10 is not greater than 0.6MPa, the steam may be continuously introduced into the autoclave 10 if the pressure in the other autoclaves 10 is still greater than the pressure in the other autoclaves 10, and the pressure and temperature in the autoclaves 10 may be maintained in the manner described above. When the pressure in the autoclave 10 reaches 0.6mpa, the first air valve 8 is closed and the fifth air valve 16 is opened, so that the saturated gas with high temperature and high pressure enters the autoclave 10 through the sixth air pipe 15 until the temperature in the autoclave 10 reaches a threshold value, that is, a constant temperature state, and the pressure reaches 1.1 to 1.2 mpa at the moment, thereby completing the whole temperature rising process.
Wherein, constant temperature and constant pressure process: the central part of the blank body in the process has a small amount of part which does not reach the constant temperature, reaches the temperature consistent with the outer layer in the early stage of the constant temperature stage, the blank body in the whole process fully carries out hydrothermal synthesis reaction to generate enough hydration products and reach the necessary crystallinity, the blank body is converted into a finished product, good performance is obtained, the pressure in the process is 1.1-1.3MPa, the temperature reaches 184-191 ℃, and the temperature is kept for 5-9 hours.
Wherein, the temperature and pressure reduction process is as follows: after the constant temperature and the constant pressure are finished, an air pouring valve is opened to pour air, and when the pressure in the kettle is released to 0.3MPa, a pressure release valve is opened to release the pressure in full force.
According to the invention, through the cooperation among the autoclaved kettle, the vacuumizing branch cylinder, the slow gas branch cylinder, the gas pouring branch cylinder, the gas collecting branch cylinder and various valves which are sequentially connected, in the heating and boosting process of the autoclaved curing link of producing the aerated concrete block, the low-pressure superheated steam of the residual heat of the cement provided by other autoclaved kettles and the cement factory is blended, so that the heating and boosting process speed is slow before and after, and the pressure and temperature are kept to be matched, thereby improving the production quality of the aerated concrete block and improving the utilization rate of energy sources.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. A device for producing concrete blocks by utilizing low-pressure superheated steam, which is characterized in that: including still kettle 10, the evacuation branch cylinder 1 that connects in order, slow gas branch cylinder 2, fall gas branch cylinder 3 and gas collection branch cylinder 4, evacuation branch cylinder 1 and gas collection branch cylinder 4 all pass through the trachea with still kettle 10 connects, fall gas branch cylinder 3 with others between the still kettle 10 is connected through first trachea 5, gas collection branch cylinder 4 passes through the low pressure superheated steam of external connection of second trachea 6, one side of the end of giving vent to anger of second trachea 6 is provided with first pneumatic valve 8, connect through fourth trachea 13 between slow gas branch cylinder 2 and the fall gas branch cylinder 3, be provided with third pneumatic valve 14 on the fourth trachea 13, connect through fifth trachea 11 between the fall gas branch cylinder 3 and the gas collection branch cylinder 4, be provided with fourth pneumatic valve 12 on the fifth trachea 11, gas collection branch cylinder 4 is through sixth trachea 15 intercommunication high temperature high pressure saturated steam, be provided with fifth pneumatic valve 16 on the sixth trachea 15.
2. An apparatus for producing concrete blocks using low pressure superheated steam according to claim 1, wherein: the externally connected low-pressure superheated steam is from cement waste heat provided by a cement plant.
3. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 1, comprising the steps of:
s100, raw material treatment:
preparing block slurry from quartz sand tailings, desulfurized gypsum and waste slurry according to mass proportions, and preparing lime powder, cement and aluminum powder slurry;
s200, pouring ingredients:
weighing the block slurry, lime powder, cement and aluminum powder slurry according to a proportion into a weighing container, sequentially injecting the raw materials into a stirrer to stir to form mixed slurry, introducing low-pressure superheated steam in the process, injecting the mixed slurry into a mould vehicle, and completing batch casting;
s300, standing and maintaining:
the mould vehicle injected with the mixed slurry is transported to a static stop room by a ferry vehicle for maintenance, and the mixed slurry is changed into a green body with cutting conditions through the processes of gas generation, thickening and hardening;
s400, cutting a blank: cutting the blank with the cutting hardness into various sizes, and grouping into an autoclave;
s500, autoclaved curing: the blank body enters the autoclave and needs to undergo four processes, namely a vacuumizing process, a heating and boosting process, a constant temperature and constant pressure process and a cooling and depressurization process;
wherein, the temperature rise and the pressure rise process are as follows: saturated steam is introduced for 1.5-2.5 hours, the pressure in the kettle is increased to 1.1-1.3MPa, the temperature reaches 184-191 ℃, the speed of the heating and boosting process is slow before and fast after, and the specific process is as follows:
pouring steam decompressed by other autoclaves into the autoclave 10 to raise the temperature of the autoclave 10; stopping pressure relief of other autoclaves when the temperature lag pressure condition occurs in the autoclave 10, especially in the period of 0.1-0.6MPa, and introducing low-pressure superheated steam into the autoclave 10, wherein the pressure of the low-pressure superheated steam can be cement waste heat provided by a cement plant and is 0.5-0.7MPa, the temperature is 280-320 ℃, the temperature in the autoclave 10 can be slowly increased in the inflation process until the temperature is matched with the pressure, stopping introducing the low-pressure superheated steam, introducing high-temperature saturated steam, continuously heating and boosting to 1.1-1.3MPa, and the temperature is 184-191 ℃, and the autoclave enters a constant-temperature and constant-pressure state.
4. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: in the step S100, lime powder is lime powder with the screen residue of a square hole screen with the fineness of 0.08mm being less than 15% which is ground by a ball mill; the cement adopts 42.5 ordinary Portland cement; the gas generating material is aluminum powder paste, and the aluminum powder paste and water are prepared into aluminum powder slurry.
5. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: in the step S200, the block slurry is injected into a stirrer for stirring, then cement and lime powder are injected into the stirrer for stirring for 60 seconds, low-pressure steam is introduced, when the temperature of the slurry mixed in the stirring tank reaches 35 ℃, the steam is stopped, when the temperature of the slurry mixed in the stirring tank reaches 40 ℃, aluminum powder slurry is injected, and after the aluminum powder slurry is stirred in the stirring tank for 30 seconds, the mixed slurry is completely injected into a mould vehicle.
6. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 4, characterized in that: in the step S100, the mass ratio of the raw materials is as follows: 65-75 parts of quartz sand tailings and 12-16 parts of lime powder; 13-18 parts of cement, 2-4 parts of desulfurized gypsum and 5-8 parts of waste slurry; 0.1-0.15 part of aluminum powder.
7. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: the whole process of the step S300 requires 2 hours, and the temperature of the static room is kept at 40-55 ℃ and the humidity is kept at 0.7-0.9.
8. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: the vacuumizing process of step S500: and vacuumizing the autoclave by using a vacuum pump, discharging most of air in the autoclave and part of air in the blank body to form a negative pressure state, and vacuumizing to-0.06 MPa in the whole process for 20-30 minutes.
9. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: the constant temperature and constant pressure process of step S500: the central part of the blank body in the process has a small amount of part which does not reach the constant temperature, reaches the temperature consistent with the outer layer in the early stage of the constant temperature stage, the blank body in the whole process fully carries out hydrothermal synthesis reaction to generate enough hydration products and reach the necessary crystallinity, the blank body is converted into a finished product, good performance is obtained, the pressure in the process is 1.1-1.3MPa, the temperature reaches 184-191 ℃, and the temperature is kept for 5-9 hours.
10. A method of producing an apparatus for producing concrete blocks using low pressure superheated steam according to claim 3, characterized in that: the cooling and depressurization process of step S500: after the constant temperature and the constant pressure are finished, a steam pouring valve is opened to pour steam, and when the pressure in the kettle is released to 0.3MPa, a pressure release valve is opened to release the pressure in full force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311530389.6A CN117381936A (en) | 2023-11-16 | 2023-11-16 | Device and method for producing concrete building blocks by utilizing low-pressure superheated steam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311530389.6A CN117381936A (en) | 2023-11-16 | 2023-11-16 | Device and method for producing concrete building blocks by utilizing low-pressure superheated steam |
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| CN117381936A true CN117381936A (en) | 2024-01-12 |
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| CN202311530389.6A Pending CN117381936A (en) | 2023-11-16 | 2023-11-16 | Device and method for producing concrete building blocks by utilizing low-pressure superheated steam |
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| CN209794115U (en) * | 2019-04-03 | 2019-12-17 | 曲水标威新型建材有限公司 | Aerated brick heat preservation evaporates pressure cauldron system |
| CN112622009A (en) * | 2020-12-11 | 2021-04-09 | 苏州信义新型墙体材料有限公司 | Automatic aerated concrete steam curing gas distribution system |
| CN113715160A (en) * | 2021-07-13 | 2021-11-30 | 太原钢铁(集团)有限公司 | Production process of high-strength aerated concrete slab |
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| CN209794115U (en) * | 2019-04-03 | 2019-12-17 | 曲水标威新型建材有限公司 | Aerated brick heat preservation evaporates pressure cauldron system |
| CN112622009A (en) * | 2020-12-11 | 2021-04-09 | 苏州信义新型墙体材料有限公司 | Automatic aerated concrete steam curing gas distribution system |
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