CN115157443B - Device suitable for preparing water-based foam and mixing and stirring water-based foam and cement paste - Google Patents
Device suitable for preparing water-based foam and mixing and stirring water-based foam and cement paste Download PDFInfo
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- CN115157443B CN115157443B CN202210696955.XA CN202210696955A CN115157443B CN 115157443 B CN115157443 B CN 115157443B CN 202210696955 A CN202210696955 A CN 202210696955A CN 115157443 B CN115157443 B CN 115157443B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/10—Mixing in containers not actuated to effect the mixing
- B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
- B28C5/14—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis
- B28C5/142—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades
- B28C5/143—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades for materials flowing continuously through the mixing device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0806—Details; Accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The application discloses a device suitable for preparing water-based foam and mixing the water-based foam with cement paste, which comprises a gas cylinder, a flask, a foam chamber and a stirring cylinder, wherein inert gas is filled in the gas cylinder, a gas outlet of the gas cylinder is sequentially communicated with a gas inlet pipe and a T-shaped three-way pipe, the other two ends of the T-shaped three-way pipe are respectively communicated with a foaming liquid inlet pipe at the opening of the flask and an open pipeline at the left lower end of the foam chamber, foaming liquid is filled in the flask, a plurality of layers of porous media with gradually increased porosity are arranged in the foam chamber, a filler is arranged between adjacent layers of porous media, a discharge pipe is arranged at the bottom of the foam chamber, a foam outlet pipe is arranged at the middle upper end of the foam chamber, the foam outlet pipe is communicated with the stirring cylinder, a slurry inlet is arranged at the upper end of the stirring cylinder for inputting cement paste, and a slurry outlet is arranged at the lower end of the stirring cylinder. The device is used for preparing uniform, fine and stable carbon dioxide water-based foam, low foam breaking rate, large contact area and uniformly mixed foam cement slurry.
Description
Technical Field
The application belongs to the field of foaming equipment and stirring equipment, and particularly relates to a device suitable for preparing water-based foam and mixing and stirring the water-based foam and cement paste.
Background
The foamed cement slurry has lower permeability and higher strength under the same cement ratio condition. The foam cement slurry with different specific gravities can completely meet the requirements of different working performances such as compressive strength, permeability, fluidity and the like. Foamed cement slurries have been widely used as a new material. Meanwhile, a large amount of gas such as carbon dioxide gas polluting the environment is generated due to fuel combustion and clinker calcination in cement production, and in order to reduce carbon emission in the air and protect the environment, attempts are made to prepare water-based foam by using the gas, so as to prepare light foam cement slurry, and then a method for preparing foam synchronous grouting slurry by using the light foam cement slurry is adopted to obtain the effect. However, most of the water-based foams prepared by the existing foaming equipment do not have uniform foam structures, higher foaming times and certain stabilization time, the prepared water-based foams can not meet the quality requirements required by engineering, meanwhile, most of the existing mixing equipment is added once when mixing and stirring, the foams are easy to break during mixing, the foam breaking rate is higher, the contact area between the water-based foams and cement paste is small, all properties of the foam cement paste obtained by mixing and stirring can not meet the engineering requirements, manual stirring is often required for experiments to obtain the foam cement paste with better quality, meanwhile, the current technology can hardly realize the pace consistency of foaming and mixing and stirring, namely, after foaming is finished, the foam is introduced into a mixer while cement paste is added, so that the loss of materials is less, and the equipment abrasion is less.
Therefore, a foaming device capable of preparing fine, uniform and stable water-based foam and a mixing device with simple structure, less foam breakage in the mixing and stirring process and large contact area between the foam and cement slurry are needed, and meanwhile, the working pace of the two needs to be ensured.
Disclosure of Invention
The application aims to solve the technical problem of providing a device which is suitable for preparing water-based foam and mixing and stirring the water-based foam and cement paste, wherein the device provides the gas required by the preparation of the foam through different gas bottles; providing a foaming liquid with constant temperature through a flask; preparing fine, stable and uniform water-based foam through a foamer; the prepared water-based foam and cement slurry are mixed and stirred by a mixer, so that foam cement slurry with low foam breaking rate and large contact area between the foam and the cement slurry and each performance meeting engineering requirements is obtained; the foaming and mixing steps are controlled to be consistent through designed working steps. In addition, the device has simple structural design and lower cost.
In order to solve the technical problems, the application adopts the following technical scheme:
the utility model provides a device suitable for preparation water-based foam and mix it with grout stirs, includes gas cylinder, flask, foam cavity and churn, the inert gas of gas cylinder intussuseption, the gas outlet of gas cylinder is linked together with gas inlet pipe and T type three-way pipe in proper order, the other both ends of T type three-way pipe are linked together with the open-ended pipeline of the foaming liquid inlet pipe and the foam cavity left side lower extreme of flask opening part respectively, be equipped with the foaming liquid in the flask, be equipped with constant temperature heater on the flask, be equipped with the porous medium of multilayer porosity increase gradually in the foam cavity, be equipped with the filler between the adjacent layer porous medium, the bottom of foam cavity is equipped with the exhaust pipe, the well upper end of foam cavity is equipped with foam outlet pipe, the gas outlet department of gas cylinder is equipped with the gas cylinder valve, the exit of flask is equipped with the flask valve, foam outlet pipe department is equipped with foam outlet pipe valve, foam outlet pipe is linked together with the churn, the upper end of churn is equipped with into thick liquid mouth and is used for importing the grout, the lower extreme of churn is equipped with the thick liquid mouth.
Further, the mixing drum is transversely placed, a hollow spiral rod which is transversely placed is arranged in the mixing drum, the mixing drum and the hollow spiral rod are connected with a rotating shaft of a bearing, the bearing is powered by a motor, a foam outlet pipe stretches into the mixing drum, the foam outlet pipe is communicated with the hollow spiral rod, and foam outlet round holes are uniformly formed in the hollow spiral rod.
Preferably, the bearing comprises an inner rotating shaft and an outer rotating shaft which rotate reversely, the inner rotating shaft is connected with the hollow spiral rod, the outer rotating shaft is connected with the stirring cylinder, a plurality of inner shaft blades are arranged on the outer wall of the hollow spiral rod, and a plurality of outer shaft blades are arranged on the inner wall of the stirring cylinder.
Preferably, the inner shaft blade is a spiral stainless steel blade, and the outer shaft blade is a rectangular stainless steel blade.
Preferably, the porous medium is a plurality of layers of steel wire meshes, and the filler is steel wool and is uniformly filled between the steel wire meshes of the adjacent layers.
Further, a density detector and a PH detector are arranged at the right upper part of the stirring cylinder, and an air pressure controller is arranged on the air bottle.
Further, be equipped with the rectangle hole on the churn, the outside of churn is close to the position on one side of rectangle hole articulates and is equipped with the rectangular plate, the PH meter can dismantle the setting and be in the inboard of rectangular plate, the outside of churn is close to the fixed lug that is equipped with in the other trilateral position of rectangle hole, the lug is equipped with the recess, the inboard of rectangular plate is equipped with 3/4 circle bulge loop, the bulge loop with recess looks adaptation, be equipped with the lockhole on the bulge loop, be equipped with the hasp on the lug, the lockhole with hasp looks adaptation.
Preferably, the reading of the air pressure controller is 0.2kpa, the foaming liquid adopted in the flask comprises 4g/L of foaming agent tea saponin, 5g/L of foam stabilizer dodecyl and 2g/L of thickener sodium polyacrylate, and the temperature of the constant temperature heater is set to 25 ℃.
Further, the method for preparing the foam cement slurry comprises the following steps:
step A: introducing inert gas into the foaming liquid to prepare foam, calculating the foaming multiplying power Y of the foaming liquid, and preparing the prepared foam according to 5: mixing the foam cement slurry ratio of 1 with cement slurry, stirring to obtain foam cement slurry for test, and measuring to obtain foam cement slurry density Z;
and (B) step (B): calculating the amount of foam required by an experiment based on the amount X of the foam cement slurry prepared by the experiment plan and the density Z of the foam cement slurry, wherein the foam amount is 0.83X, so as to prepare foaming liquid;
step C: filling inert gas in the gas cylinder, closing a valve of the gas cylinder, and adjusting the air pressure controller to enable the air pressure in the gas cylinder to be 0.2kpa;
step D: the gas cylinder is connected with a gas inlet pipe, the gas inlet pipe is communicated with a T-shaped three-way pipe, the other two branches of the T-shaped three-way pipe are respectively communicated with a foaming liquid inlet pipe at the opening of the flask and an open pipeline at the left lower end of the foam chamber, and a valve of the flask is closed;
step E: b, selecting a foam chamber with proper volume to be communicated with the T-shaped tee pipe based on the amount of foam required by the experiment in the step B;
step F: simultaneously opening a gas cylinder valve and a flask valve, and closing a foam outlet pipe valve to prepare foam;
step G: under the pushing of inert gas, foam enters the foam chamber to gradually rise and passes through the porous medium and the filler;
step H: as the porosity increases gradually, the foam pore size becomes larger and more uniform;
step I: the fine, stable and uniform water-based foam is obtained and stored in the foam chamber;
step J: based on the bubble-to-pulp ratio of 5:1 and water to gel ratio 1:2.4, 15% of light magnesium oxide, 25% of fly ash and 60% of cement, and calculating and preparing the water, cement, light magnesium oxide and fly ash required by mixing and stirring;
step K: mixing and stirring water, cement, light magnesium oxide and fly ash to prepare cement paste;
step L: opening a valve of a foam outlet pipe, and pouring the prepared cement slurry into a slurry inlet;
step M: turning on the motor, rotating the hollow screw rod clockwise, rotating the stirring cylinder anticlockwise, discharging foam from the foam outlet round hole, and moving forwards along with cement paste in a spiral way;
step N: reading out the density of the foam cement slurry according to the reading of the density detector;
step O: reading the PH value of the foam cement slurry according to a PH detector;
step P: discharging the prepared foam cement slurry from a slurry outlet, and closing the motor;
step Q: obtaining the required foam cement slurry.
Preferably, the calculation formula in the process of preparing the foam cement slurry is as follows:
C＝0.426X×Z
D＝0.1775X×Z
E＝0.1065X×Z
wherein X is the volume of foam cement slurry planned to be prepared by an experiment, Y is the foaming multiplying power of foaming liquid, Z is the density of foam cement slurry measured by the experiment, K is the density of foaming liquid, A is the volume of foaming liquid required by the experiment, B is the mass of water required for stirring cement, C is the mass of cement required, D is the mass of fly ash required, and E is the mass of light magnesium oxide required.
Compared with the prior art, the application has the following beneficial effects:
the application aims to solve the technical problem of providing a device which is suitable for preparing water-based foam and mixing and stirring the water-based foam and cement paste, wherein the device provides the gas required by the preparation of the foam through different gas bottles; providing a foaming liquid with constant temperature through a flask; preparing fine, stable and uniform water-based foam through a foamer; the prepared water-based foam and cement slurry are mixed and stirred by a mixer, so that foam cement slurry with low foam breaking rate and large contact area between the foam and the cement slurry and each performance meeting engineering requirements is obtained; the foaming and mixing steps are controlled to be consistent through designed working steps. In addition, the device has simple structural design and lower cost.
Drawings
FIG. 1 is a schematic illustration of an apparatus of the present application suitable for preparing and mixing water-based foam with a cement slurry;
FIG. 2 is a schematic view of the interior of a foam chamber of the present application;
FIG. 3 shows the model and measurement principle of the home-made PH meter of the application.
1-gas cylinder, 2-air pressure controller, 3-gas cylinder valve, 4-gas inlet pipe, 5-T-shaped three-way pipe, 6-flask, 7-constant temperature heater, 8-flask valve, 9-foaming liquid inlet pipe, 10-foam chamber, 11-porous medium, 12-filler, 13-discharge pipe, 14-foam outlet pipe, 15-foam outlet pipe valve, 16-bearing, 17-pulp inlet, 18-inner shaft blade, 19-foam outlet round hole, 20-outer shaft blade, 21-stirring cylinder, 22-hollow screw rod, 23-density detector, 24-pulp outlet, 25-PH detector and 26-motor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
The embodiment of the application provides foaming and mixing equipment, as shown in fig. 1, wherein the equipment for providing gas is a gas cylinder 1, and the gas cylinder 1 is provided with a gas pressure controller 2 and a gas cylinder valve 3; the equipment for providing foaming liquid is a flask 6 provided with a constant temperature heater 7, a movable bottom plate and a flask valve 8; the foaming equipment comprises a gas inlet pipe 4, a foaming liquid inlet pipe 9, a T-shaped tee pipe 5, a foam chamber, a movable bottom plate 10 of the foam chamber, a porous medium 11, a filler 12, a discharge pipe 13, a foam outlet pipe 14 and a foam outlet pipe valve 15; the device provides gas raw materials for foaming through the gas cylinder 1, the gas pressure during ventilation is controlled based on the gas pressure controller 2, the ventilation speed is controlled based on the gas cylinder valve 3, the gas is introduced based on the gas inlet pipe 4, the foaming liquid is stored based on the flask 6, the foaming liquid temperature is controlled based on the constant temperature heater 7, the flask 6 is controlled to be opened and closed based on the movable bottom plate, the speed of introducing the liquid is controlled based on the flask valve 8, the foaming liquid is introduced based on the foaming liquid inlet pipe 9, the gas inlet pipe 4, the foaming liquid inlet pipe 9 and the foaming cylinder are connected based on the T-shaped three-way pipe 5, the prepared water-based foam is stored based on the foaming chamber and the movable bottom plate 10 thereof, the prepared foam is fine, uniform and stable based on the porous medium 11 and the filler 12, the foaming whole process is carried out based on the foaming cylinder, the diluent which is not fully foamed can be discharged by the discharging pipe 13, the liquid which is not fully foamed is discharged based on the discharging pipe 13, the foam is introduced into the mixer based on the foam outlet pipe 14, and the time is controlled based on the foam outlet pipe valve 15.
As shown in fig. 2, the movable baffle is arranged at the bottom of the foam chamber 10, and the valve is arranged on the foam outlet pipe 14, so that the foam can be stored in the foam chamber well, and after the cement slurry is mixed, the valve is opened, so that the foam and the cement slurry can be accurately controlled to be simultaneously introduced into the mixer, and the loss of materials and the abrasion of equipment are effectively reduced. The foam chamber 10 has various volumes, and the foam chamber 10 is detachable, so that the foam chamber 10 with different volumes can be accurately selected according to the amount of foam required by engineering and installed in the foamer. The left side of the foam chamber 10 is provided with a piston, the surface is provided with graduations, and after the valve is opened, the foam can be pushed into the subsequent mixer precisely by the compression piston.
Specifically, the air pressure controller 2 is disposed on the upper left side of the air bottle 1, the air bottle valve 3 is disposed at the outlet of the air bottle 1, the air bottle 1 is connected with the air inlet pipe 4, the right side of the air inlet pipe 4 is connected with the left end guide opening of the T-shaped three-way pipe 5, and the air bottle 1 is filled with required air based on the air inlet pipe 4. The constant temperature controller 7 is arranged on the outer side of the flask 6, the flask valve 8 is arranged at the outlet of the flask 6, the flask 6 is connected with the foaming liquid inlet pipe 9, the lower part of the foaming liquid inlet pipe 9 is connected with the upper guide mouth of the T-shaped three-way pipe 5, and the right guide mouth of the T-shaped three-way pipe 5 is connected with the foaming cylinder to finish the introduction and foaming of raw materials; the foaming cylinder is placed in a vertical manner (the gas-liquid movement direction is opposite to the gravity direction of the steel plate), the lowest part is a discharge pipe 13, the inside is filled with a filler 12 and a porous medium 11, the top is a foam chamber and a baffle plate 10 thereof, and the vertical gas-liquid flow direction is opposite to the gravity direction, which is equivalent to introducing a bubbling effect and is beneficial to the generation of foam. The T-shaped three-way pipe 5 is simple in structure, easy to process and manufacture and low in cost, and can be used for simultaneously introducing gas and foaming liquid into the foaming device to control the quality of the obtained foam.
Preferably, the flask 6 is inverted, scales are marked on the side wall of the flask, foaming liquid is introduced easily and conveniently, and the volume of the foaming liquid can be accurately controlled.
Further, the gas filled in the gas bottle 1 is carbon dioxide, the reading of the gas pressure controller 2 is regulated to 0.2kpa, the ratio of foaming liquid adopted in the flask 6 is tea saponin 4g/L, the ratio of a selected foam stabilizer is dodecyl 5g/L, the thickener is sodium polyacrylate 2g/L, the temperature is regulated to be constant at 25 ℃ by regulating the constant temperature heater 7, the carbon dioxide gas is provided through the gas bottle 1, the foaming liquid is provided through the flask 6, and the two are mixed for foaming. The foaming liquid is nontoxic and pollution-free.
Further, the filler 12 is steel wool, and the porous medium 11 is steel wire mesh. The steel wire mesh is provided with three layers, and the pore diameters of the steel wire mesh are respectively 0.1mm,0.5mm and 1.0mm from bottom to top. The steel wool is filled between the steel wire meshes. The foam chamber 10 is internally provided with steel wires, steel wool is filled between the steel wires, the porosity of the steel wires is gradually increased, the steel wires and the steel wool simultaneously act to form turbulent vortex, and the foam pore diameter is enlarged and uniform along with the gradual increase of the porosity. The porous medium 11 is made of steel wire mesh, and the filler 12 is made of steel wool, so that the effectiveness and economic applicability of the test engineering are comprehensively considered.
The mixing device of the present application comprises a bearing 16, a pulp inlet 17, an inner shaft blade 18, a foam outlet circular hole 19, an outer shaft blade 20, a stirring cylinder 21, a hollow screw 22, a density detector 23, a pulp outlet 24, a PH detector 25 and a motor 26. The mixing equipment controls the rotation of the stirring cylinder 21 and the hollow screw rod 22 through the bearing 16, introduces cement slurry which is not mixed with foam through the slurry inlet 17, enables foam produced by the foaming device to flow out through the foam outlet round hole 19, mixes and stirs cement slurry and foam through the inner shaft blade 18 and the outer shaft blade 20, drives the blades to rotate through the rotation of the stirring cylinder 21 and the hollow screw rod 22, discharges the prepared carbon dioxide foam cement slurry through the slurry outlet 24, provides power for driving the stirring cylinder and the hollow screw to rotate through the motor 26, and measures the relevant performance of the foam through the density detector 23 and the PH detector 25.
Specifically, the whole stirring cylinder 21 is horizontally placed, the left end is connected with the foam outlet pipe 14 in the foaming equipment, the hollow screw rod 22 is positioned in the hollow screw rod and is connected with the right end of the foam outlet pipe 14, the foam outlet round holes 19 are uniformly formed in the hollow screw rod 22, and the right end of the stirring cylinder 21 is provided with a motor 26. The pulp inlet 17 and the pulp outlet 24 are respectively positioned at the left upper part and the right lower part of the stirring barrel. The density detector 23 and the PH detector 25 are respectively provided inside the stirring cylinder and at the upper part of the rightmost end of the stirring cylinder.
The inner shaft blade 18 is disposed outside the hollow screw 22, and the outer shaft blade 20 is disposed inside the stirring cylinder 21.
The bearings 16 are divided into an inner bearing that controls the rotation of the hollow screw 22 and an outer bearing that controls the rotation of the stirring cylinder 21. The motor 26 is used for providing power, the bearing 16 is used for controlling the hollow screw rod 22 and the stirring cylinder 21 to rotate in the opposite direction, the inner shaft blade 18 and the outer shaft blade 20 are driven to rotate, cement slurry is injected through the slurry inlet 17, foam is separated out through the foam outlet round hole 19, cement slurry and foam are mixed and stirred through the rotation of the inner shaft blade 18 and the outer shaft blade 20, the obtained carbon dioxide foam cement slurry is discharged through the slurry outlet 24, and the relative performance of the prepared foam cement slurry is measured through the density detector 23 and the PH detector 25.
The internal and external bearings control the rotation of the hollow screw rod 22 and the stirring cylinder 21 respectively, thereby improving the stability of the device. The motor 26 is adopted to control the hollow screw rod 22 and the stirring cylinder 21 to rotate, so that the manpower consumption is reduced. A foam outlet hole 19 is formed in the center of the pitch of each circle of spiral blade and is used as a foam outlet, so that the contact area of foam and cement slurry is increased, foam is uniformly distributed, and the foam breaking rate is reduced. The hollow screw 22 and the stirring cylinder 21 are rotated in opposite directions, which also increases the contact area of the foam with the cement slurry and improves the mixing uniformity of the foam with the slurry. The inner shaft blade adopts a spiral shape, so that the stirring efficiency is obviously improved, the contact area is increased, and the foam breaking rate is reduced. The inner and outer shaft blades are made of stainless steel materials, so that the possibility of rusting and strength reduction after long-time contact with foam is reduced.
Further, the pore diameter of the foam outlet round hole 19 is 1.0mm so that the foam prepared before is separated out.
Further, the inner shaft blade 18 is spiral, the outer shaft blade 20 is rectangular, and the materials adopted are stainless steel, so that the stirring area can be increased, the foam breaking rate can be reduced, the stirring efficiency can be improved, meanwhile, the blade rust can be prevented and the strength can be reduced.
Further, the rotation direction of the stirring cylinder 21 is counterclockwise, and the rotation direction of the hollow screw 22 is clockwise. The stirring contact area is increased, and the mixing is more uniform and sufficient.
Further, the density detector 23 is a tuning fork densitometer, the model of which is an LDS-2100 tuning fork densitometer, and the measuring range of the density is 0-3g/cm3. And the PH value of the foamed cement slurry is measured by adopting PH test paper of the PH meter.
As shown in fig. 3, the PH meter 25 may be detachably placed in the stirring tank 21. Preferably, the stirring cylinder 21 is provided with a rectangular hole, the position of the outer side of the stirring cylinder 21, which is close to one side of the rectangular hole, is hinged to a rectangular plate, the PH detector 25 is detachably arranged on the inner side of the rectangular plate, the outer side of the stirring cylinder 21 is close to the other three sides of the rectangular hole, a convex block is fixedly arranged on the other three sides of the rectangular hole, the convex block is provided with a groove, the inner side of the rectangular plate is provided with 3/4 rings of convex rings, the convex rings are matched with the groove, a lock hole is formed in the convex rings, a lock catch is arranged on the convex block, and the lock hole is matched with the lock catch. The provision of the mating structure ensures tightness and also detachably prevents the PH meter 25.
Example 2
Typically, we use a turbine foamer to prepare a carbon dioxide water-based foam and manually mix the cement slurry with the carbon dioxide water-based foam. The foam prepared by the method is not uniform and stable enough and is extremely easy to break, meanwhile, cement paste and foam are not fully contacted when being mixed and stirred, the strength of the prepared test block is low, and the foam in the cement paste breaks more. The application improves the foaming and mixing equipment for foaming and stirring, and improves the quality of the prepared foam, but the cement slurry is not synchronously introduced when the foam enters the mixer, and a quantitative calculation formula is not available, so that a great amount of materials are wasted and the equipment is excessively worn. The device is further improved, and raw materials required by calculation formulas are obtained. The whole working process after improvement is as follows:
and A, selecting a foaming agent tea saponin, wherein the amount of the tea saponin is 4g/L, the amount of a foam stabilizer dodecyl is 5g/L, the thickener is sodium polyacrylate, the amount of the sodium polyacrylate is 2g/L, preparing foaming liquid, fixing the temperature of the foaming liquid to 25 ℃, and introducing carbon dioxide gas to prepare a small amount of foam, thereby calculating the foaming multiplying power Y of the foaming liquid. The foam prepared was prepared according to 5: and mixing the foam cement slurry with cement slurry according to the foam cement slurry ratio of 1, stirring to obtain foam cement slurry, and measuring to obtain the density Z of the foam cement slurry.
And (B) step (B): determining the amount X of the foam cement slurry required by the experiment, and according to the density Z of the foam cement slurry obtained by the experiment in the previous step A, the foam cement slurry ratio is 5:1 calculating the amount of foam required for stirring, and selecting a foaming agent tea saponin, wherein the amount of the tea saponin is 4g/L, the amount of a foam stabilizer dodecyl is 5g/L, the thickener is sodium polyacrylate, and the amount of the sodium polyacrylate is 2g/L. And C, quantitatively preparing a foaming agent diluent according to the foaming multiplying power of the foaming liquid obtained in the step A as Y, opening a movable baffle at the bottom of the flask 6, introducing the foaming agent diluent into the flask 6, closing the baffle, closing a valve, and opening a constant-temperature heater to enable the temperature of the foaming agent diluent to be constant at 25 ℃.
Step C: the gas filled in the gas cylinder 1 should be inert, in order to explore various properties of carbon dioxide foam cement slurry in the experiment, carbon dioxide is selected as the gas used in foaming, the corresponding gas cylinder is obtained, the gas pressure controller is regulated, the gas pressure is controlled to be 0.2kpa, and the valve is closed.
Step D: the gas inlet pipe 4 is connected with the T-shaped tee pipe 5, and the gas inlet pipe 4 is connected with the gas cylinder; the foam chamber 10 is connected with a branch pipe of the T-shaped three-way pipe 5, and the other branch pipe of the T-shaped three-way pipe 5 is connected with the flask 6;
step E: each foam chamber 10 has a different volume, and the amount of foam required for the experiment is known from the previous step B, and accordingly, the foam chamber with the appropriate volume is selected and installed, and the piston at the left side of the foam chamber is pulled to the leftmost side.
Step F: simultaneously, the valves of the gas cylinder and the flask 6 are opened, the movable baffle at the bottom of the foam chamber is opened, the valve at the foam inlet pipe is closed, the flow rate of gas and liquid is controlled, and foaming is started.
Step G: the diluted foaming agent solution and a certain gas with a certain pressure enter the lower part of the foaming cylinder, the porous medium 11 and the filler 12 act, the foam gradually rises in the foaming cylinder, and the baffle plate at the bottom of the foam chamber is opened.
Step H: as the porosity increases gradually, the foam pore size becomes larger and uniform.
Step I: the fine, stable and uniform water-based foam is obtained, and the baffle plate at the bottom of the foam chamber is closed, so that the foam is stored in the foam chamber. At this point, the foaming process was completed, and we obtained the carbon dioxide water-based foam required for the experiment and stored it inside the foam chamber, followed by the stirring work of the cement paste, and introducing and mixing it with the foam simultaneously.
Step J: the amount X of foamed cement slurry required for the experiment was determined in the previous step B by the foaming ratio 5:1 and water to gel ratio 1:2.4 and the proportion of various cementing materials, namely 15 percent of light magnesia, 25 percent of fly ash and 60 percent of cement, and calculating and preparing the water, the cement, the light magnesia and the fly ash required by mixing and stirring.
Step K: mixing and stirring the water, cement and other materials to obtain cement paste.
Step L: the valve at the foam inlet pipe is opened, the piston is slowly pushed according to the experimental requirement, so that the foam enters the mixer, meanwhile, the cement paste prepared previously is poured into the slurry inlet of the mixer, and the motor is turned on.
Step M: the motor makes the hollow screw rod rotate clockwise, so that the stirring cylinder rotates anticlockwise, and foam is discharged from the foam outlet round hole and moves forwards along with cement paste in a spiral way; the spiral inner shaft blade and the rectangular outer shaft blade are simultaneously stirred and mixed in opposite directions.
Step N: reading out the density of the foamed cement slurry according to the reading of the tuning fork concentration meter
Step O: and (3) turning over the side wall of the mixer at the position of the PH detector, taking out PH test paper fixed on the side wall, and reading the PH value of the foam cement slurry according to the color of the test paper.
Step P: and discharging the prepared foamed cement slurry from a slurry outlet, and closing the motor.
Step Q: obtaining the required foam cement slurry.
The amounts of water, cement, fly ash, light magnesium oxide and foaming liquid required for this experiment were calculated by the following calculation formulas:
C＝0.426X×Z
D＝0.1775X×Z
E＝0.1065X×Z
wherein X is the volume of the required foamed cement slurry determined before the experiment, Y is the foaming ratio of the foaming liquid, Z is the density of the foaming cement slurry read out according to a densimeter in the previous experiment, K is the density of the foaming liquid, A is the volume of the foaming liquid required by the experiment, B is the mass of water required for stirring cement, C is the mass of the required cement, D is the mass of the required fly ash, and E is the mass of the required light magnesium oxide.
The water-based foam prepared by the application has a uniform foam structure, higher foaming multiple and certain stabilization time.
After the two most important performance indexes based on compressive strength and density are preferably proportioned, the mechanical properties of the carbon dioxide foam composite cement slurry are measured, including the calculus rate, the water separation rate, the setting time and the fluidity, the applicability of the carbon dioxide foam cement slurry grouting is analyzed by comparing the performance standards of the foam cement slurry, the setting time is measured by adopting a typical Vicat instrument, the fluidity is measured by adopting a truncated cone circular model method, and the test results are shown in the following table:
table 1 table for measuring mechanical properties of foam composite cement slurry
As shown in the table, the compressive strength of the carbon dioxide foam cement stone body modified by the external admixture is far higher than the standard of the foam cement strength, and the density, the stone rate and the water separation rate of the carbon dioxide foam cement stone body are all higher than those of the common cement stone body, so that the requirements of foam cement slurry are met; the initial setting time of the foam cement is 146min, the final setting time is 413min, the setting time requirement is met, the setting time is 45min when compared with that of ordinary cement slurry, and the final setting time is 390min longer, because a large amount of free water in the slurry is stored in a liquid film of a foam system, the free water is separated out after the foam is dissipated, the hydration process is prolonged, meanwhile, the sample is more loose and porous due to the existence of the foam, and the moving path of the water is prolonged; the average fluidity is 21cm, the fluidity requirement of the foam cement is met, and the fluidity of the cement slurry is increased by about 20% compared with that of the ordinary cement slurry with 16-18 cm, which indicates that the fluidity of the slurry material is increased by the incorporation of the water-based foam.
The embodiment of the application provides foaming and mixing stirring equipment, which is used for preparing carbon dioxide water-based foam through a foaming device, mixing and stirring the carbon dioxide water-based foam and cement slurry through a mixer, and finally obtaining carbon dioxide foam cement slurry for site engineering, so that the emission of carbon dioxide is reduced, and a novel light high-strength material is provided for site construction, and the equipment is low in cost and environment-friendly.
Generally, the mixing equipment has the characteristics of less foam cracking, simple structure, uniform mixing and capability of continuously producing high-flow foam cement slurry, and simultaneously, the equipment can enable foam and cement slurry to enter the mixer for stirring simultaneously through the storage function of the foam chamber, so that the loss of materials and the abrasion of the equipment are reduced.
In practical engineering, the effect of the produced foamed cement slurry mainly depends on two core components, a foaming device and a mixer, and the application redesigns the pore foaming device, so that the prior art has less design. The bidirectional stirring type mixer is designed, so that the actual engineering is more pertinent;
the application can prepare uniform, fine and stable carbon dioxide water-based foam and foam cement slurry with low foam breaking rate, large contact area and uniform mixing through the design of the foamer and the mixer. Meanwhile, the equipment has the advantages of simple structure, low cost, easiness in processing and manufacturing and high reliability, and the produced foam cement slurry can meet the requirements of site construction.
Claims (5)
1. A method of preparing foamed cement slurry based on apparatus adapted to prepare a water-based foam and mix it with the cement slurry, characterized by:
the device suitable for preparing water-based foam and mixing the water-based foam with cement slurry comprises a gas cylinder (1), a flask (6), a foam chamber (10) and a stirring cylinder (21), wherein inert gas is filled in the gas cylinder (1), the gas cylinder (1) is connected with a gas inlet pipe (4), the right side of the gas inlet pipe (4) is connected with the left end guide opening of a T-shaped three-way pipe (5), the other two ends of the T-shaped three-way pipe (5) are respectively communicated with a foam liquid inlet pipe (9) at the opening of the flask (6) and an opening pipeline at the left lower end of the foam chamber (10), foam liquid is filled in the flask (6), a constant-temperature heater (7) is arranged on the flask (6), porous media (11) with gradually increased multi-layer porosity are arranged in the foam chamber (10), a filler (12) is arranged between the adjacent layers of porous media (11), the bottom of the foam chamber (10) is provided with a discharge pipe (13), the middle upper end of the foam chamber (10) is provided with a foam outlet pipe (14), the other two ends of the T-shaped three-way pipe (5) are respectively communicated with an opening pipeline at the opening of the flask (6), the foam outlet pipe (14) is provided with the foam outlet (14), the valve (6) is provided with the foam outlet (15), the outlet pipe (14) is communicated with the opening (15), the upper end of the stirring cylinder (21) is provided with a slurry inlet (17) for inputting cement slurry, and the lower end of the stirring cylinder (21) is provided with a slurry outlet (24);
the stirring cylinder (21) is transversely arranged, a hollow spiral rod (22) which is transversely arranged is arranged in the stirring cylinder (21), the stirring cylinder (21) and the hollow spiral rod (22) are connected with a rotating shaft of a bearing (16), the bearing (16) is powered by a motor (26), a foam outlet pipe (14) stretches into the stirring cylinder (21), the foam outlet pipe (14) is communicated with the hollow spiral rod (22), and foam outlet round holes (19) are uniformly formed in the hollow spiral rod (22);
the porous medium (11) is a plurality of layers of steel wire meshes, and the filler (12) is steel wool and is uniformly filled between the steel wire meshes of the adjacent layers;
the upper right part of the stirring cylinder (21) is provided with a density detector (23) and a PH detector (25), and the gas cylinder (1) is provided with a gas pressure controller (2);
the method for preparing the foam cement slurry comprises the following steps:
step A: introducing inert gas into the foaming liquid to prepare foam, calculating the foaming multiplying power Y of the foaming liquid, and preparing the prepared foam according to 5: mixing the foam cement slurry ratio of 1 with cement slurry, stirring to obtain foam cement slurry for test, and measuring to obtain the density Z of the foam cement slurry measured by test;
and (B) step (B): calculating the amount of foam required by an experiment based on the volume X of the foam cement slurry planned to be prepared by the experiment and the density Z of the foam cement slurry measured by the experiment, thereby preparing foaming liquid;
step C: filling inert gas in the gas bottle (1), closing a gas bottle valve (3), and adjusting the gas pressure controller (2) to enable the gas pressure in the gas bottle (1) to be 0.2kpa;
step D: the gas cylinder (1) is connected with the gas inlet pipe (4), the gas inlet pipe (4) is communicated with the T-shaped three-way pipe (5), then the other two branches of the T-shaped three-way pipe (5) are respectively communicated with the foaming liquid inlet pipe (9) at the opening of the flask (6) and the open pipeline at the left lower end of the foam chamber (10), and the flask valve (8) is closed;
step E: based on the amount of foam required by the step B experiment, selecting a foam chamber (10) with proper volume to be communicated with a T-shaped tee pipe (5);
step F: simultaneously opening a gas cylinder valve (3) and a flask valve (8), and closing a foam outlet pipe valve (15) to prepare foam;
step G: under the pushing of inert gas, the foam enters the foam chamber (10) to gradually rise and passes through the porous medium (11) and the filler (12);
step H: as the porosity increases gradually, the foam pore size becomes larger and more uniform;
step I: the fine, stable and uniform water-based foam is obtained and stored in the foam chamber (10);
step J: based on the volume X of the foamed cement slurry planned to be prepared by the experiment determined in step B, the foamed cement slurry ratio is 5:1 and water to gel ratio 1:2.4 and the proportion of various cementing materials, namely 15 percent of light magnesium oxide, 25 percent of fly ash and 60 percent of cement, calculating the dosage of water, cement, light magnesium oxide and fly ash required during mixing and stirring and preparing the materials;
step K: mixing and stirring water, cement, light magnesium oxide and fly ash to prepare cement paste;
step L: opening a foam outlet pipe valve (15) and pouring the prepared cement slurry into a slurry inlet (17);
step M: turning on a motor (26), rotating a hollow screw rod (22) clockwise, rotating a stirring cylinder (21) anticlockwise, discharging foam from a foam outlet round hole (19), and moving forwards along with cement paste in a spiral way;
step N: reading out the density of the foamed cement slurry according to the reading of the density detector (23);
step O: reading the PH value of the foamed cement slurry according to a PH detector (25);
step P: discharging the prepared foamed cement slurry from a slurry outlet (24), and closing a motor (26);
step Q: obtaining the required foam cement slurry;
the calculation formula in the process of preparing the foam cement slurry is as follows:
C＝0.426X×Z
D＝0.1775X×Z
E＝0.1065X×Z
F＝0.83X
wherein X is the volume of foam cement slurry planned to be prepared by an experiment, Y is the expansion ratio of foaming liquid, Z is the density of foam cement slurry measured by the experiment, K is the density of foaming liquid, A is the volume of foaming liquid required by the experiment, B is the mass of water required for stirring cement, C is the mass of cement required, D is the mass of fly ash required, E is the mass of light magnesium oxide required, and F is the amount of foam required by the experiment.
2. A method of preparing foamed cement slurry based on apparatus adapted to prepare a water-based foam and mix it with a cement slurry according to claim 1, wherein:
the bearing (16) comprises an inner rotating shaft and an outer rotating shaft which rotate reversely, the inner rotating shaft is connected with the hollow spiral rod (22), the outer rotating shaft is connected with the stirring cylinder (21), a plurality of inner shaft blades (18) are arranged on the outer wall of the hollow spiral rod (22), and a plurality of outer shaft blades (20) are arranged on the inner wall of the stirring cylinder (21).
3. A method of preparing foamed cement slurry based on apparatus adapted to prepare a water-based foam and mix it with a cement slurry according to claim 2, wherein:
the inner shaft blade (18) is a spiral stainless steel blade, and the outer shaft blade (20) is a rectangular stainless steel blade.
4. A method of preparing foamed cement slurry based on apparatus adapted to prepare a water-based foam and mix it with a cement slurry according to claim 3, wherein:
be equipped with the rectangle hole on churn (21), the outside of churn (21) is close to the position on one side of rectangle hole articulates and is equipped with the rectangular plate, PH meter (25) can dismantle the setting and be in the inboard of rectangular plate, the outside of churn (21) is close to the fixed lug that is equipped with in the other trilateral position of rectangle hole, the lug is equipped with the recess, the inboard of rectangular plate is equipped with 3/4 circle bulge loop, the bulge loop with recess looks adaptation, be equipped with the lockhole on the bulge loop, be equipped with the hasp on the lug, the lockhole with hasp looks adaptation.
5. A method of preparing foamed cement slurry based on apparatus adapted to prepare and mix and stir water-based foam with cement slurry according to claim 4, wherein:
the reading of the air pressure controller (2) is 0.2kpa, the foaming liquid adopted in the flask (6) comprises 4g/L of foaming agent tea saponin, 5g/L of foam stabilizer dodecyl and 2g/L of thickener sodium polyacrylate, and the temperature of the constant temperature heater (7) is set to 25 ℃.
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