CN115107144A

CN115107144A - Preparation method of slag soil baking-free brick

Info

Publication number: CN115107144A
Application number: CN202211024430.8A
Authority: CN
Inventors: 李大山; 章敏; 尤振枫; 吴人杰; 邱君力; 洪澜
Original assignee: Hangzhou Yuhang Environmental Protection Technology Co ltd
Current assignee: Hangzhou Jiashu New Material Technology Co ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-09-27
Anticipated expiration: 2042-08-25
Also published as: CN115107144B

Abstract

The invention discloses a preparation method of a residue soil baking-free brick, which comprises the following steps: s1, removing impurities from the engineering muck, crushing, airing until the water content is less than 5%, grinding, crushing and screening; s2, dividing and homogenizing the sampled muck by a quartering method, and bagging for later use; s3, mixing sandy soil and clay soil at a ratio of 1:1, adding 11.11% of curing agent and 10% of river sand, mixing the raw materials into uniform powder by adopting special mixing equipment, adding 15% of water, and stirring into a semi-dry mixture; s4, preparing particles with the particle size of 4.5-5.5mm by a rolling granulator; s5, preparing the particles into a large sample of the residue soil brick with the size of 200 x 100 x 50mm under the pressure of 20MPa by using a hydraulic testing machine; s6, placing the large sample of the muck brick in a steam rapid curing box in an environment with the temperature of 60 ℃ for thermal curing for 10 d. The residue soil baking-free brick prepared by the invention has higher compressive strength, excellent water resistance and higher density, the average softening coefficient of the residue soil baking-free brick is 0.91, and the performance index of the existing MU15 autoclaved sand-lime brick is reached. The invention is suitable for the technical field of the preparation process of the residue soil baking-free brick.

Description

Preparation method of slag soil baking-free brick

Technical Field

The invention belongs to the technical field of novel slag baking-free brick preparation processes, and particularly relates to a preparation method of a slag baking-free brick.

Background

The engineering waste soil is one kind of building waste, and is produced in building unit, building, reconstruction, extension, etc. and in the house decorating and finishing process, most of the waste is solid waste, such as brick, concrete, metal, glass, timber, etc. With the acceleration of urbanization construction, a large number of important projects such as subway construction, rapid road network construction, urban village-in-village transformation, suburban stadium construction and the like are operated in succession, and the generated urban muck also increases year by year. At present, building wastes such as waste bricks and stones generated by building demolition are used as backfill materials such as pond residues and the like for road foundation filling due to good particle strength. However, the waste engineering waste soil generated by excavation of the building foundation is still treated in the traditional modes of open-air stacking, landfill and the like at present due to fine particles, low strength and high water content. With the rapid increase of the construction waste, the method occupies a large amount of land resources, pollutes the environment and consumes huge resources, thereby not only influencing the appearance of the city, but also bringing huge hidden dangers to the city. Due to the fact that the defects of the traditional modes such as stacking and landfill are gradually exposed, the traditional development concept can not be met. The development of the green building industry is accelerated, the regeneration and resource utilization of solid wastes is promoted, and the method becomes a new direction of the industry. Therefore, disposal of the waste soil has become an important issue for examining the urban treatment capability and treatment level.

The baking-free brick prepared by modifying the slag soil is becoming the current trend of resource utilization, and in recent years, the low-cost advantage of cement-based baking-free bricks is gradually weakened due to the rising price of raw materials such as cement, sand and stone. Meanwhile, with the rapid development of economy in recent years, the industrialization process is accelerated, and the solid waste is increasing, especially the construction waste, engineering dregs and the like generated in the urban and rural development. The treatment mode of the engineering muck filling not only occupies land resources and pollutes the environment, but also has huge potential safety hazard, and can not meet the current urban construction and economic green development concept. The project muck must change the current situation and move to the road of resource utilization. At present, the slag soil is researched to be used as a substitute raw material for preparing the slag soil baking-free brick, but when ordinary cement is used, the problems of large cement consumption, low strength, insufficient water resistance, strength shrinkage and the like exist. The existing slag soil baking-free brick has low market competitiveness and is difficult to be applied in a large scale. Therefore, it is necessary to develop a new research on feasibility of the slag baking-free brick.

Disclosure of Invention

The invention provides a preparation method of a slag soil baking-free brick, so that the slag soil baking-free brick has higher compressive strength, excellent water resistance and higher density, and the average softening coefficient of the slag soil baking-free brick is 0.91, thereby achieving the performance index of the current MU15 autoclaved sand-lime brick.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of a slag soil baking-free brick comprises the following steps:

s1, pretreatment of raw materials: removing impurities from the engineering muck, crushing, airing until the water content is less than 5%, grinding and crushing to ensure that all the particles of the muck pass through a standard sieve of 4.75 mm;

s2, dividing and homogenizing the sampled muck by a quartering method, and bagging for later use;

s3, mixing the raw materials: weighing the composite muck according to different weight ratios to ensure that the ratio of sandy soil to clay soil is 1:1, adding 11.11 percent of curing agent and 10 percent of river sand into the muck, wherein the curing agent is SS-W-S type mineral base cementing material, and then mixing the raw materials into uniform powder by adopting special mixing equipment;

s4, mixing the mixture by special mixing equipment, adding 15% of water, and stirring to obtain a semi-dry mixture;

s5, preparing the semi-dry mixture into particles with the particle size of 4.5-5.5mm through a rolling granulator;

s6, preparing the obtained particles into a 200 x 100 x 50mm big sample of the muck brick under the pressure of 20MPa by using a hydraulic testing machine;

s7, placing the big muck brick sample in a steam rapid curing box, and performing thermal curing on the big muck brick sample in an environment at 60 ℃ for 10 days to obtain a final finished product.

Further, in step S5, the semi-dry mix is granulated into granules having a particle size of 5.0mm by a roll granulator.

Further, special mixing apparatus including can dismantle the end cover of connecting in mixing cauldron upper end, in feed inlet and the water that the end cover was constructed sprays the joint, an active stirring mechanism installs in mixing the cauldron, just active stirring mechanism lower extreme stretches out mixing the cauldron through the adaptor, the adaptor is connected for articulated formula with active stirring mechanism's connected mode, and the adaptor passes through angle adjusting component and adjusts its and active stirring mechanism's angle, and the adaptor is connected with mixing the lower extreme rotation of cauldron, rotates the piece and is driven and drive active stirring mechanism and rotate.

Furthermore, a blanking hopper with the caliber gradually reduced downwards along the vertical direction is constructed in the end cover, a blanking cavity is formed in the end cover and between the feeding hole and the blanking hopper, and a blanking port is formed at the small-diameter end of the blanking hopper; an annular spraying plate is constructed at the large-diameter end of the lower end face of the lower hopper, a spraying cavity is formed between the annular spraying plate and the corresponding surface of the end cover, the water spraying joint is communicated with the spraying cavity, spraying holes are fully distributed in the annular spraying plate, and the axial cross section of the annular spraying plate is of a circular arc-shaped structure protruding towards the active material overturning mechanism.

Furthermore, the adapter comprises a driving wheel which is superposed with the axis of the mixing kettle, a connecting sleeve is constructed at the upper end of the driving wheel, and the connecting sleeve is assembled at the lower end of the mixing kettle and is rotationally connected with the mixing kettle.

Further, active stirring mechanism includes the first discharge cylinder that is formed with first globular connector on the outer peripheral face, in the bowl form groove that supplies the assembly of first globular connector is constructed on the adaptor, and the below that just is located first globular connector on the outer peripheral face of first discharge cylinder is constructed with first connecting plate, angle adjusting part connects between first connecting plate and adaptor, is constructed with spiral stirring vane in the upper end of first discharge cylinder, spiral stirring vane extends along the axis of first discharge cylinder, and spiral stirring vane's bore upwards expands gradually along vertical, can dismantle in the lower extreme of first discharge cylinder and be connected with row material stopper.

Further, the pitch of the spiral stirring blade is increased in a downward vertical direction.

Further, active stirring mechanism includes the row's of being formed with the globular connector of second material portion on the outer peripheral face, in be constructed the bowl form groove that supplies the assembly of the globular connector of second on the adaptor, in the compounding of the upper end intercommunication of row's material portion promotes the portion, in it has the compounding to pass through the mouth to arrange to be constructed between material portion and the compounding promotion portion.

Further, the discharging part comprises a second discharging cylinder, a second connecting plate is arranged on the outer peripheral surface of the second discharging cylinder and below the second spherical connecting head, the angle adjusting assembly is connected between the second connecting plate and the adapter, a discharging joint is arranged on the lower part of the second discharging cylinder, and a control valve is arranged on the discharging joint; the compounding promotes the portion including setting up in the compounding of the second row material section of thick bamboo upper end and promoting a section of thick bamboo, the compounding promotes the axis coincidence that a section of thick bamboo and second were arranged to the material, and the bore that a compounding promoted a section of thick bamboo is greater than the bore that a second was arranged a section of thick bamboo, and coaxial coupling has the installation pole on the output shaft of a positive and negative motor that changes, the position that the installation pole is located a second row material section of thick bamboo and a compounding promotion section of thick bamboo has constructed first helical blade and second helical blade respectively, just the one end that first helical blade and second helical blade are close to each other continues.

Furthermore, an umbrella-shaped plate is installed at the end part of the installation rod extending out of the upper end of the mixing lifting cylinder, spraying water which is sprayed in the mixing kettle through a water spraying joint is sprayed on the mixture which splashes in a rotating mode, the mixture which splashes in the rotating mode rotates out of the upper end of the mixing lifting cylinder, and the mixture splashes downwards in an inclined mode due to the blocking of the umbrella-shaped plate.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that: through the present inventionThe residue soil baking-free brick prepared by the preparation method has extremely good characteristics, and is mainly represented by the following steps: the average compressive strength of the slag soil baking-free brick can reach 17.99MPa, the water absorption of the slag soil baking-free brick is only 4.03%, the water absorption is low, the slag soil baking-free brick shows excellent water resistance, and after water is soaked for 4d, the compressive strength of a sample still keeps about 91%, namely, the average softening coefficient of the slag soil baking-free brick is 0.91, the sample reaches the performance index of the existing MU15 autoclaved sand-lime brick, and compared with a slag soil baking-free brick sample prepared by using P ∙ O425 cement, the slag soil baking-free brick has higher strength; the slag-soil brick prepared by granulation and high-pressure molding at 20MPa has higher density, and the volume density under the natural air-drying condition is up to 2106 kg/m ³ 。

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is a rectangular graph of compressive strength of different muck samples at different ages;

FIG. 2 is a rectangular diagram showing the influence of the mixing amount of curing agent and cement on the strength of the slag-soil bricks of different ages;

FIG. 3 is a rectangular plot of the apparent density of different pressure formed slag bricks;

FIG. 4 is a rectangular graph of the compressive strength of different pressure formed slag-soil bricks;

FIG. 5 is a histogram of the strength of the sample as a function of curing time at three curing temperatures;

FIG. 6 shows the shape of the sample of the muck brick after molding and after curing;

FIG. 7 is a schematic structural diagram of a special mixing device according to the present invention;

FIG. 8 is a cross-sectional view of the axial structure of FIG. 7;

FIG. 9 is an enlarged view of portion A of FIG. 8;

FIG. 10 is a schematic structural view of the end cap of the present invention;

FIG. 11 is a schematic diagram of the apparatus of FIG. 7 with the mixing still and end caps removed;

FIG. 12 is a front view of the structure of FIG. 11;

FIG. 13 is a schematic structural view of an adapter of the present invention;

FIG. 14 is a schematic structural view of another special mixing apparatus of the present invention;

FIG. 15 is a cross-sectional view of the axial structure of FIG. 14;

FIG. 16 is a schematic diagram of the apparatus of FIG. 14 with the mixing still and end caps removed.

Labeling components: 100-mixing kettle, 101-end cover, 102-feed inlet, 103-water spray joint, 104-blanking cavity, 105-blanking hopper, 106-blanking outlet, 107-annular spray plate, 108-spray cavity, 200-helical stirring blade, 201-first discharging barrel, 202-discharging plug, 203-first connecting plate, 204-first spherical connecting head, 300-adapter, 301-driving wheel, 302-bowl-shaped groove, 303-connecting sleeve, 400-adjusting rod, 401-hinge rod, 402-connecting rod, 500-positive and negative rotation motor, 501-second discharging barrel, 502-second connecting plate, 503-discharging joint, 504-control valve, 505-mixing lifting barrel, 506-mounting rod, 507-mixing through port, 508-first helical blade, 509-second helical blade, 510-second ball joint, 511-umbrella plate.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention. Reagents, methods and equipment described in the following examples are all available unless otherwise specified.

Examples

The embodiment provides a preparation method of a residue soil baking-free brick, which comprises the following steps:

s3, mixing the raw materials: weighing the composite muck according to different weight proportions to ensure that the proportion of the sandy soil and the muck is 1:1, adding 11.11 percent of curing agent and 10 percent of river sand into the muck, wherein the curing agent is SS-W-S type mineral-based cementing material (a production enterprise, SS-W-S type is' thawing industry Boda environmental protection technical material research institute Co., Ltd., Anhui province), and then mixing the raw materials into uniform powder by adopting special mixing equipment;

s5, preparing the semi-dry mixture into particles with the particle size of 4.5-5.5mm through a rolling granulator; the particle size of particles made of the semi-dry mixture is generally controlled to be 5.0mm, so that the quality of finished products of the subsequently pressed muck bricks after bulk curing is higher;

s7, placing the slag brick large sample in a steam rapid curing box, and performing thermal curing on the slag brick large sample in an environment of 60 ℃ for 10d to obtain a final finished product.

1. The invention tests the performance of the residue soil baking-free brick

(1) Apparent density

Testing an instrument: electronic balance, vernier caliper

The test method comprises the following steps: the surface of the test piece is cleaned, the test piece is placed in a room temperature ventilation place for drying for 24h, the mass m of the test piece is weighed, the length, the width (or the diameter) and the thickness of the dried test piece are measured twice by using a vernier caliper, and the average value is taken to calculate the volume V.

The bulk density (. rho.) of each sample was calculated to the nearest 0.1 g/cm according to equation 2-2 ³ .

Formula (1)

In the formula: rho-density of the sample, g/cm ³ ;

In the formula: v-volume of the sample, cm ³ ；

(2) Compressive strength

Testing equipment: microcomputer electrohydraulic servo universal tester and hydraulic tester

The test method comprises the following steps: the compressive strength R of the cylindrical sample is tested by a universal electronic press according to GB/T2810-2016 ceramic tile test method. The baking-free brick product is carried out according to the compression strength test method specified in GB/T2542-. And (3) folding the fracture of the two half-section bricks formed after the middle fracture outwards, placing the test piece on a pressure bearing plate of a testing machine, keeping the central axis of the test piece coincident with the pressure center of a pressure plate of the testing machine, and then slowly loading at the speed of 10-30 kN/s until the test piece is damaged. The maximum failure load P was recorded. The compressive strength of each test piece was calculated according to equation 5-2 to the nearest 0.1 MPa.

Formula (2)

In the formula: r is the compressive strength of a test piece, MPa;

p is a failure load, N;

l is the length of the pressed surface, mm;

b width of the pressure surface, mm.

(3) Flexural strength

Testing equipment: microcomputer electrohydraulic servo universal tester

The test method comprises the following steps: the compressive strength σ of the strip-shaped small sample (73 × 37 × 20 mm) was tested by means of a universal electronic testing machine in accordance with GB/T2810-. The baking-free brick product is carried out according to the flexural strength test method specified in GB/T2542 + 2012 wall brick test method. In the test, an anti-bending clamp with the span of 160mm is used, the anti-bending clamp is uniformly loaded on an electronic universal testing machine at the speed of 50-150N/s until a sample is broken, and the maximum breaking load P is read. The flexural strength of each test piece was calculated according to the formula 5-3 to the accuracy of 0.1 MPa.

Formula (3)

In the formula: sigma-breaking strength, MPa;

p-maximum failure load, N;

l-span, mm;

b, the width of the sample is mm;

h-height of the sample, mm.

(4) Water absorption and saturation coefficient

Taking out the sample cured to the specified age, cleaning the surface of the sample, then placing the sample in a 105C +/-5 ℃ blast drying oven to be dried to be constant (in the drying process, the phase difference between the two previous and next weighing processes is not more than 0.2 percent, and the time interval between the two previous and next weighing processes is 2 hours), removing dust, and weighing the dry mass m ₀ . The dried sample was immersed in water for 24h at about 20 ℃. The sample was removed, wiped with a wet towel to remove surface moisture and weighed immediately. The obtained wet mass m is soaked for 24h ₂₄ . And then, standing the soaked wet sample on the side of a grate plate of a cooking box, wherein the sample distance is not less than 10 mm, injecting clear water, heating and cooking for 5h, stopping heating and cooling to the normal temperature, wherein the water level in the box is 50mm higher than the surface of the sample. The wet mass ms is weighed for boiling for 5 h.

Formula (4)

Formula (5)

In the formula: k sample saturation coefficient;

m ₂₄ kg of wet mass of the sample soaked in water at normal temperature for 24 hours;

m ₀ -sample dry mass, kg;

m ₅ -wet mass, kg of sample boiled for 5 h.

(5) Coefficient of softening

Testing equipment: microcomputer electrohydraulic servo universal tester

The test method comprises the following steps: the sample for softening test is immersed in water at 20 +/-5 deg.c to water level 20mm higher than the sample, soaked for 4 days and taken out, and water is dropped onto the wire net frame for 1min before the water is wiped off with wet cloth to reach the saturated dry state. And (3) placing the 5 comparative samples in a non-ventilated room at the temperature of not less than 10 ℃ for 72 hours, wherein the samples are air-dried samples. The softened and non-softened control samples were then subjected to a compressive strength test. The results were calculated according to equations 5-6.

Formula (6)

In the formula: k _f -the coefficient of softening;

R _f -average post-softening compressive strength in megapascals (MPa);

R ₀ the mean compressive strength of the comparative samples in megapascals (MPa).

(6) Cracking of lime

According to the method specified in GB/T2542-.

2. Influence of slag plasticity on preparation and performance of baking-free bricks

The plasticity indexes of two types of muck (clay soil and sandy soil) retrieved from construction sites in Yuhangdistrict have obvious difference, and the plasticity of the muck is an important factor influencing the forming and curing of muck bricks. In order to analyze the influence of the plastic index of the slag soil on the preparation and performance of the baking-free brick, the two types of slag soil are mixed according to different mixing ratios in a test, a test piece is prepared under the same preparation condition, and the performance difference of the test piece is represented.

2.1 design of the experiment

The tests were carried out by mixing sandy soil and clay soil in the designed proportions (see table 1) and the method of making the muck brick was carried out as in example 1. Wherein, the designed mixing amount of the curing agent is 11 percent, after the muck and the curing agent are uniformly mixed, water with the water content of 15 percent is added for rapid stirring to form a semi-dry material, and the semi-dry material is pressed and molded in a cylindrical mold with the diameter of 50mm under the pressure of 20 MPa. And forming 6 samples in each group, demolding, curing at 60 ℃ in a steam rapid curing box, and measuring the compressive strength of cured 1d, 2d and 3 d.

TABLE 1 test proportions

As can be seen from Table 1, the plasticity index of the mixture is gradually improved with the increase of the doping amount of the clay soil. Wherein, when the sand content is more than 75%, the test block is easy to be broken or adhered to the inner wall of the mould during demoulding due to poor plasticity. Therefore, the water content is properly increased during the test to improve the plasticity of the muck, so that the demoulding is facilitated.

2.2 results and analysis

The compressive strength of the muck brick samples aged to different ages is represented in figure 1, and figure 1 shows the compressive strength of the muck brick samples aged to different ages. As can be seen from the figure, the sample of the residue soil brick which is rapidly cured at high temperature to different ages is gradually increased along with the extension of the curing age. Meanwhile, the compressive strengths of different muck samples in the same age are obviously different. After 1d of thermal curing, the compressive strength of the pure muck sample is only 7.27MPa, while the compressive strength of the samples with the addition of 25% and 50% of clay is increased to more than 8.6 MPa. This shows that the introduction of the clay increases the plasticity of the muck, and has a certain contribution to the early strength of the sample, but the clay doping amount is continuously increased to 75%, and the compressive strength of the cured 1d sample is reduced to 7.73MPa, but the strength is still higher than that of the pure sand sample.

In addition, the compressive strength of the sample thermally cured to 3d is obviously increased, wherein the compressive strength of the sample prepared from 50% of sandy soil and 50% of clay soil is the highest and reaches 11.01 MPa. The foregoing studies indicate that sandy soils contain more siliceous gravel and the particle size distribution is more concentrated than the larger particle size of the clay. Meanwhile, the active SiO contained in the sandy soil ₂ The sandy soil is a main component of the muck participating in the hydration reaction of the curing agent, so that the sandy soil has higher reaction activity in the cementation and curing. However, the clay soil has higher plasticity, is beneficial to the forming of a blank body and is particularly beneficial to the early strength of a test piece.

In conclusion, the preparation of the slag soil brick is facilitated by properly mixing the clay soil and the sandy soil. Under the condition of using the existing muck, the optimal mixing ratio of the muck is 50 percent of sandy soil and 50 percent of clay soil.

3. Influence of mixing amount of curing agent on baking-free brick performance

3.1 design of the experiment

In order to determine the appropriate dosage of the curing agent for preparing the residue soil baking-free brick, tests are carried out to study the compressive strength of a residue soil brick sample when the dosage of the curing agent is 9%, 10%, 11%, 12% (≈ 1:10.1, 1:9, 1:8.1, 1: 7.3) and the dosage of P ∙ O425 cement is 12%. Tests sandy soil and clay soil were mixed at a ratio of 1:1, the specific raw material design is shown in table 5-1, and the pretreatment of the material and the preparation of the muck brick were as in the previous examples. The method comprises the following steps of adding water into the mixture according to the water content of 15%, stirring to prepare a semi-dry mixture, carrying out compression molding on the semi-dry mixture in a hydraulic testing machine to form a cylindrical test piece with the diameter of 50mm x 50mm, and carrying out hot curing at 60 ℃ for 1-3 d to characterize the compressive strength of the test piece. The design of the test formulation and the maintenance schedule are shown in Table 2.

Table 2 experimental formulation design and maintenance schedule

3.2 results and analysis

The compressive strength of the samples of the muck bricks cured to different ages is represented as shown in figure 2, and figure 2 shows the influence of the mixing amount of the curing agent and the cement on the strength of the muck bricks at different ages. As can be seen from figure 2, the mixing amount of the curing agent is a main factor influencing the strength of the slag soil baking-free brick, under the steam rapid curing condition, the compressive strength of the slag soil baking-free brick is gradually improved along with the mixing amount of the curing agent, and the influence on the early strength (1 d) of the sample is more remarkable.

As can be seen from the figure, the compressive strength of the test piece subjected to thermal curing for 1d and containing 9% of the curing agent is 6.19MPa, and when the adding amount of the curing agent is increased to 12%, the compressive strength is improved by 55.6% and reaches 9.63 MPa. In addition, when curing is carried out for 3 days, the compressive strength of the sample with 9% of the mixing amount of the curing agent can reach 8.51MPa, and the compressive strength of the sample with 11% of the mixing amount of the curing agent is 11.34MPa and is similar to that of the sample with 12% of the mixing amount. However, when 12% P ∙ O425 cement was used as the cement, the 3d strength of the resulting clinker brick was only 7.79 MPa, which is lower than the strength obtained by incorporating 9% of the novel mineral-based cement. In addition, cement clinker bricks have a lower initial strength increase under thermal curing conditions than mineral-based cementitious materials.

In summary, the slag soil baking-free brick with higher strength can be prepared by using the novel mineral-based cementing material, and the optimal mixing amount of the curing agent for preparing the slag soil brick is 11% based on the aspects of saving raw materials and reducing cost.

4. Influence of molding pressure on baking-free brick performance

Compression molding is a key process for preparing the slag-soil brick, wherein molding pressure indirectly influences the mechanical property of the slag-soil brick by influencing the density of the slag-soil brick. Therefore, the influence rule of the forming pressure of the slag brick on the density and the mechanical property of the slag brick is researched so as to guide the design of the forming process parameters of the slag brick.

4.1 design of the experiment

Based on the forming pressure and the slag compression characteristic of the existing baking-free brick, the dry density and the compressive strength of the slag brick samples are obtained by experimental research, wherein the forming pressure is respectively 15MPa, 20MPa and 30 MPa. In the test, sandy soil and clay soil are mixed according to the ratio of 1:1, SS-W-S type mineral base cementing materials are added according to the mixing amount of 11%, water is added according to the water content of 15%, the materials are mixed into a semi-dry material, a cylindrical sample with the diameter of 50mm and the diameter of 50mm is prepared by regulating and controlling the forming pressure of a hydraulic press, the sample is cured in a steam rapid curing box at the temperature of 60 ℃ after being demoulded, and the compressive strength of 3d and 7d of curing is measured.

4.2 results and discussion

After the samples of the waste soil bricks molded under different pressures are cured for 3 days, the wet density is directly tested, and the dry density is tested after the samples are dried at 80 ℃, and the result is shown in figure 3, wherein figure 3 shows the apparent density of the waste soil bricks molded under different pressures. As can be seen from FIG. 3, the wet density of the various pressure formed samples was about 2.0 g/cm ³ The dry density is about 1.7 to 1.8 g/cm ³ Compared with the sintered clay brick, the density is higher, and the density is gradually increased along with the increase of the forming pressure. Wherein the wet densities of the 15MPa, 20MPa and 30MPa molded samples are increased in sequence and reach 1.96 g/cm respectively ³ 、2.05 g/cm ³ 、2.12 g/cm ³ And the dry density of the 15MPa molded sample is 1.70 g/cm ³ (ii) a molded sample of only 30MPaDry density 1.84 g/cm ³ ) 92.4% of dry density.

The 3d and 7d compressive strengths of the samples molded under different pressures are shown in FIG. 4, and FIG. 4 shows the compressive strengths of the bricks molded under different pressures. As can be seen from fig. 4, the molding pressure is related to the compressive strength of the sample, and is mainly expressed in that the strength of the sample cured to a predetermined age is higher as the molding pressure increases. Among these, the molding pressure most significantly affects the 3d strength of the sample. As can be seen, the compressive strength of 12MPa was obtained when the 30MPa molded sample was cured to 3 days, while the compressive strength of only 8.26MPa was obtained for the 15MPa molded sample. And after curing for 7 days, the compressive strength of the sample prepared by the molding pressure of more than 20MPa can reach more than 15 MPa. At this time, the influence of the molding pressure on the compressive strength of the sample is reduced. Therefore, the forming pressure for preparing the residue soil baking-free brick is preferably more than or equal to 20 MPa.

5. Influence of curing temperature and curing time on performance of baking-free bricks

As can be seen from the above analysis, the curing time is the main factor affecting the strength of the baking-free brick, and the curing temperature is also the main factor affecting the reaction speed of the SS-W-S type mineral-based cementing material. In order to determine the optimal curing system for preparing the residue soil baking-free brick, the development of the strength of the sample along with the curing time at different curing temperatures is researched.

5.1 design of the experiment

The test analyzed the increase in strength of the samples when cured at room temperature (20 ℃), 60 ℃ and 80 ℃. The test adopts a mixed muck (sandy soil and clay in a ratio of 1: 1) preparation test, wherein the mixing amount of the curing agent is fixed to be 11%, the water-material ratio is fixed to be 15%, and the forming pressure of the sample is 30 MPa. The processing of the raw materials and the preparation method of the slag soil brick are similar to the examples. And forming the mixture into cylindrical test pieces with the diameter of 50mm by 50mm, and curing the cylindrical test pieces at different temperatures for 3d, 7d, 14d and 28d to represent the compressive strength of the test pieces.

5.2 results and analysis

FIG. 5 shows the compressive strength of the muck brick sample when the sample is cured to different ages at three curing temperatures, and FIG. 5 shows the strength of the sample at the three curing temperatures as a function of curing time. As can be seen from FIG. 5, the curing time and curing temperature are the main factors affecting the strength of the clinker brick. Wherein the compressive strength of the sample subjected to thermal curing at 60 ℃ for 3d reaches 11.56MPa, which is close to the strength of the sample subjected to normal-temperature curing (20 ℃) for 14d, and the compressive strength of the sample subjected to thermal curing at 80 ℃ for 7d reaches 15.4MPa, which is close to the compressive strength of the sample subjected to normal-temperature curing for 28 d. Therefore, the maintenance time of the sample can be obviously shortened by increasing the maintenance temperature, and the method is particularly beneficial to the development of early strength.

In addition, the compressive strength of the sample gradually increased with the increase of the curing time. However, under the normal temperature curing condition, the strength of the sample increases slowly with the curing time, and particularly, the strength increases slowly at the early stage. However, under the hot curing conditions, the strength rate of the sample shows a "fast before slow" increase, and the higher the curing temperature, the more significant the early strength increase of the sample. For example, the strength of the sample after thermal curing at 60 ℃ for 3d is 11.56MPa, which is 59.2% of the compressive strength at 14 d. And the strength of the sample subjected to thermal curing at 80 ℃ for 3d is 14.1MPa and reaches 65.9 percent of the compressive strength of 14 d.

6. Comprehensive performance evaluation of residue soil baking-free brick prepared by curing agent

Based on the research results of the slag soil types, the mixing amount of the curing agent, the molding pressure and the curing conditions on the slag soil brick in the research, the SS-W-S type mineral-based cementing material is adopted as the cementing material by optimizing the material composition and the curing system of the slag soil baking-free ceramsite, the slag soil taken from the residual Hangzhou field is used for preparing the baking-free ceramsite, the physical and mechanical properties of the baking-free ceramsite are represented, and the baking-free ceramsite is expected to provide guidance for the industrial production of the slag soil baking-free brick.

6.1 test conditions

According to the earlier research conclusion, the SS-W-S type mineral-based cementing material is added into the composite muck (sandy soil: clay soil =1: 1) and 10% of river sand as the raw material according to the doping amount of 11.11% (lime-soil ratio 1: 8), and the mixture is uniformly stirred by adopting special mixing equipment. Then 15% of water is added into the mixed powder and stirred into a semi-dry mixture for pressing a large sample of the 200 x 100 x 50mm muck brick. Considering that the pressing uniformity of the large sample is difficult to control, before the large sample is formed, the semi-dry mixture is subjected to rolling granulation by a rolling granulator to form particles with the diameter of about 5mm, then the particles are subjected to compression molding in a test mold under the pressure of 20MPa, and 50 samples are continuously pressed. And (3) curing the prepared baking-free brick sample for 10 days in a constant temperature and humidity environment at 60 ℃, naturally drying, and representing various physical properties according to the above.

5.2 results and analysis

The sample of the experimental slag-soil brick is shown in figure 6. As can be seen from FIG. 6, the baking-free brick sample formed by the granulated residue-soil mixture has a flat surface and regular size, and the surface density of the sample after maintenance is higher. The main physical property indexes of the slag soil baking-free brick are analyzed, and the results are shown in table 3.

As can be seen from the table, after the baking-free brick sample is prepared from the residual Hangzhou engineering muck and is quickly cured for 10 days at the temperature of 60 ℃, the average compressive strength can reach 17.99MPa, the water absorption rate of the sample is only 4.03 percent, and the water absorption rate is lower. Therefore, the slag baking-free brick shows excellent water resistance, and the compressive strength of the sample is kept about 91 percent after being soaked in water for 4d, namely, the average softening coefficient of the sample is 0.91. As can be seen from the table, the slag-soil brick prepared by granulation and high-pressure forming at 20MPa has higher density, and the volume density under the natural air-drying condition is up to 2106 kg/m ³ . In addition, the average flexural strength of the slag baking-free brick is relatively low compared with the compressive strength of the slag brick, and the average flexural strength of 5 samples is 3.52 MPa, which is related to the high brittleness of the slag brick itself.

TABLE 3 indexes of performance of baking-free slag brick samples

Performance index	Unit	Sample No. 1	Sample No. 2	Sample No. 3	Sample No. 4	Sample No. 5	Mean value of
								Apparent density	kg/m ³	2103	2098	2099	2111	2120	2106
Compressive strength	MPa	18.75	17.35	17.79	19.05	17.01	17.99
								Flexural strength	MPa	3.72	3.58	3.50	3.89	2.91	3.52
Water absorption rate	%	4.08	4.21	4.10	3.99	3.77	4.03
								Coefficient of softening	--	0.90	0.88	0.91	0.95	0.91	0.91

In conclusion, the mixed muck in the Yuhang area is used as a main raw material, 11.11 percent of curing agent and 10 percent of river sand are added, the compressive strength of the muck baking-free brick pressed under 20MPa after being thermally cured for 10 days at 60 ℃ can reach 17.99MPa, the average water absorption is 4.03 percent, the softening coefficient is 0.91, and the performance index of the existing MU15 autoclaved sand-lime brick is reached. Compared with the sample of the residue soil baking-free brick prepared by using the P ∙ O425 cement, the strength is higher.

The key equipment of the invention is special mixing equipment, as shown in fig. 7-16, the special mixing equipment has a specific structure that the special mixing equipment comprises a mixing kettle 100, an end cover 101 and an active material stirring mechanism, wherein the end cover 101 is detachably arranged at the upper end of the mixing kettle 100, and a feed inlet 102 and a water spray joint 103 are formed on the end cover 101. The active material turning mechanism is arranged in the mixing kettle 100, the lower end of the active material turning mechanism extends out of the mixing kettle 100 through the adapter 300, the adapter 300 is connected with the active material turning mechanism in an articulated manner, and the angle of the adapter 300 and the active material turning mechanism is changed by adjusting the adapter 300 through the angle adjusting component. The adaptor 300 of the present invention is rotatably connected to the lower end of the mixing kettle 100, and the rotating member is driven to rotate the active material-stirring mechanism. The working principle and the advantages of the invention are as follows: an operator can change the distance of the upper end of the active material overturning mechanism deviating from the axis of the mixing kettle 100 according to the difference of the mixed raw material amount, so that when the adapter 300 is driven to rotate, the adapter 300 drives the active material overturning mechanism to rotate, the active material overturning mechanism rotates automatically or in a conical manner, during rotation, the axis of the active material overturning mechanism coincides with the axis of the mixing kettle 100, and in other cases, the active material overturning mechanism rotates in a conical manner. When the active material turning mechanism rotates, the active material turning mechanism is suitable for mixing a small amount of raw materials, and the conical rotation is suitable for mixing a large amount of raw materials. With the rotation of the active material-turning mechanism, the raw materials in the mixing kettle 100 return from the upper part to the lower part from bottom to top to form a circulation; or the raw materials in the mixing kettle 100 return from the lower part to the upper part from the top to form circulation, so that the raw materials are mixed with the peripheral raw materials and are mixed up and down simultaneously in the mixing process, and the mixing efficiency is improved. Especially, when the active material turning mechanism rotates in a cone shape, the active material turning mechanism performs eccentric stirring, so that raw materials at different positions in the mixing kettle 100 can be fully mixed, and the problem of dead angles is avoided.

As a preferred embodiment of the present invention, as shown in fig. 8, 10, and 15, a lower hopper 105 is configured in the end cover 101, and the caliber of the lower hopper 105 is tapered downward in the vertical direction. A blanking cavity 104 is formed in the end cover 101 and between the feeding hole 102 and the blanking hopper 105, a blanking hole 106 is formed at the small-diameter end of the blanking hopper 105, and each raw material enters the blanking cavity 104 through the feeding hole 102 and enters the mixing kettle 100 through the blanking hole 106. In the embodiment, an annular spraying plate 107 is configured at the large-diameter end of the lower end face of the lower hopper 105, a spraying cavity 108 is formed between the annular spraying plate 107 and the corresponding surface of the end cover 101, the water spraying joint 103 is communicated with the spraying cavity 108, and spraying holes are distributed on the annular spraying plate 107. Because the lower hopper 105 is arranged in the embodiment, the lower hopper 105 is used for separating the raw materials at the positions of the annular spraying plate 107 and the feed opening 106, so that the raw materials entering the mixing kettle 100 from the feed opening 106 are prevented from directly contacting the annular spraying plate 107; in the process of mixing materials, the mixture stirred by the active material stirring mechanism cannot splash and flow out under the blocking of the blanking hopper 105. This embodiment is for making spray water add in the mixture of raw materials uniformly, avoids appearing spray water and gathers a bundle in one point efflux in mixing kettle 100, influences the efficiency of mixing, and the measure of taking does, and annular spraying plate 107's axial cross section is towards the bellied convex structure of active stirring mechanism, and like this, spray water is the form of dispersing and sprays on the mixture that is located the rolling flow on upper portion, rolls along with lasting of mixture, has realized the intensive mixing of mixture and spray water.

As a preferred embodiment of the present invention, as shown in fig. 13, the adaptor 300 comprises a driving wheel 301, the axis of the driving wheel 301 is coincident with the axis of the mixing kettle 100, a connecting sleeve 303 is formed at the upper end of the driving wheel 301, the connecting sleeve 303 is assembled at the lower end of the mixing kettle 100, and the connecting sleeve 303 is rotatably connected with the mixing kettle 100, in this embodiment, a motor is used to drive a power wheel installed on the output shaft of the motor to rotate, the power wheel is in driving connection with the driving wheel 301 through a chain or a belt, etc., so that the driving wheel 301 rotates, and the driving wheel 301 drives an active material turnover mechanism connected with the driving wheel to rotate.

As a preferred embodiment of the present invention, the active type material turning mechanism is divided into two forms, the first form is, as shown in fig. 8-9 and fig. 11-12, the active type material turning mechanism comprises a first material discharging barrel 201 and a helical mixing blade 200, wherein a first ball-shaped connector 204 is formed on the outer circumferential surface of the first material discharging barrel 201, a bowl-shaped groove 302 is formed on the inner wall of the adaptor 300, and the first ball-shaped connector 204 is fitted into the bowl-shaped groove 302 and takes an articulated form, i.e. the first ball-shaped connector 204 rotates a certain angle in the bowl-shaped groove 302. In this embodiment, the first connecting plate 203 is constructed on the outer peripheral surface of the first discharging barrel 201 and below the first spherical connector 204, and the angle adjusting assembly is connected between the first connecting plate 203 and the adaptor 300, so that after the first spherical connector 204 rotates by a certain angle in the bowl-shaped groove 302, the angle adjusting assembly locks the angle between the first spherical connector and the adaptor, and the active material overturning mechanism is prevented from changing with the angle of the adaptor 300 during the process of mixing raw materials. The lower end of the helical mixing blade 200 of the present embodiment is interconnected with the upper end of the first barrel 201, the helical mixing blade 200 extends along the axis of the first barrel 201, and the bore of the helical mixing blade 200 is vertically and upwardly divergent. In the process that the helical stirring blade 200 is driven to rotate, the mixture at the upper part of the mixing kettle 100 is gradually conveyed to the lower part of the helical stirring blade 200 through the inside of the helical stirring blade 200 and is discharged to the outside of the helical stirring blade 200, and the mixture at the outside of the helical stirring blade 200 gradually rises to the upper part of the helical stirring blade 200, thereby forming a circulation. This embodiment can dismantle at the lower extreme of first row of feed cylinder 201 and be connected with row material stopper 202, when the semi-dry mixture that needs will mix the completion discharges mixing kettle 100, will arrange material stopper 202 and pull down, and spiral stirring vane 200 is rotatory for the semi-dry mixture moves down gradually under spiral stirring vane 200 effect, and discharges through first row of feed cylinder 201, and at this moment spiral stirring vane 200 plays the effect of arranging the material, promotes the smooth mixing kettle 100 that discharges of semi-dry mixture. During discharging, the helical stirring blade 200 may be adjusted to be inclined such that the lower portion of the helical stirring blade 200 is closer to the bottom wall of the mixing tank 100, thereby facilitating complete discharge of the semi-dry mixture. The embodiment is convenient for the mixture to be mostly discharged from the lower part of the spiral stirring blade 200, the small part of the mixture is discharged from the spiral gap between the middle part and the upper part of the spiral stirring blade 200, and the pitch of the spiral stirring blade 200 is gradually increased downwards along the vertical direction, so that the mixture is convenient to circulate up and down.

As a preferred embodiment of the present invention, the second form of the active type of the material turning mechanism is, as shown in fig. 14 to 16, that includes a discharging section and a material mixing and lifting section, wherein a second ball-shaped connector 510 is formed on the outer peripheral surface of the discharging section, a bowl-shaped groove 302 is formed on the inner wall of the adaptor 300, and the second ball-shaped connector 510 is fitted into the bowl-shaped groove 302. The lower end of the mixing material lifting part is communicated with the upper end of the discharging part, and a mixing material passing port 507 is constructed between the discharging part and the mixing material lifting part. The working principle of the embodiment is as follows: each is kept away from and is got into in mixing cauldron 100 through feed inlet 102 to fall on the bottom of mixing cauldron 100, compounding promotion portion promotes the bottom raw materials that mixes cauldron 100 to the upper end that compounding promoted portion, later the rotation splashes and goes out, make intensive mixing between the raw materials, at the rotatory in-process that splashes of raw materials, keep away from this part and carry out the water shower, make the mixture of water and mixture quick, abundant, the mixture that the rotation splashes falls in mixing cauldron 100, later promote by compounding promotion portion again, and then form the circulation. The present embodiment can adjust the angle between the compounding promotion portion and the mixing kettle 100, realizes the mixture to the raw materials of different volume. After mixing, open the row material position of row material portion, the action of reverse control compounding lifting unit realizes that the semidry mixture in the mixing kettle 100 gets into row material portion and discharges through mouth 507 by the compounding.

As a preferred embodiment of the present invention, as shown in fig. 15 to 16, the discharging part includes a second discharging cylinder 501, a second connecting plate 502 is configured on the outer circumference of the second discharging cylinder 501, the second connecting plate 502 is located below the second ball-shaped connector 510, and the above-mentioned angle adjusting assembly is connected between the second connecting plate 502 and the adaptor 300. In the present embodiment, a discharge connection 503 is formed at the lower part of the second discharge cylinder 501, and a control valve 504 is formed at the discharge connection 503. The semi-dry mixed material enters the second discharge cylinder 501 through the mixed material passing opening 507 and is discharged through the discharge joint 503. The mixing lifting part of the present embodiment includes a mixing lifting cylinder 505, the mixing lifting cylinder 505 is disposed at the upper end of the second discharge cylinder 501, the axes of the mixing lifting cylinder 505 and the second discharge cylinder 501 are coincident, and the aperture of the mixing lifting cylinder 505 is larger than the aperture of the second discharge cylinder 501. In the embodiment, a forward and reverse rotation motor 500 is selected, the forward and reverse rotation motor 500 is arranged below the second material discharge cylinder 501, an installation rod 506 is connected to an output shaft of the forward and reverse rotation motor 500, the installation rod 506 coincides with an axis of the output shaft, a first helical blade 508 is configured at a position of the installation rod 506 on the second material discharge cylinder 501, a second helical blade 509 is configured at a position of the installation rod 506 on the material mixing lifting cylinder 505, the first helical blade 508 and the second helical blade 509 both extend spirally along the axis of the installation rod 506, and ends of the first helical blade 508 and the second helical blade 509, which are close to each other, are connected with each other. When carrying out the raw materials and mixing, positive and negative motor 500 forward rotation, the raw materials that are located mixing kettle 100 lower part pass through the compounding and get into compounding through mouth 507 and promote a section of thick bamboo 505 in, intermix and promote gradually to the upper end department that the compounding promoted a section of thick bamboo 505 under second helical blade 509's effect between the raw materials, later the raw materials is rotatory to splash and go out, realize abundant, the high-efficient mixture between the raw materials, and at the in-process that the rotation splashes, the shower water sprays to this rotation region of splashing, make between mixture and the water abundant, high-efficient mixing. After the mixing is finished, the forward and reverse rotating motor 500 rotates reversely, the semi-dry mixture enters the second material discharging cylinder 501 through the mixed material passing opening 507, gradually passes through the second material discharging cylinder 501 under the action of the first helical blade 508, and is finally discharged through the material discharging joint 503. This embodiment is for making the mixture that the rotation splashes and goes out be the decurrent umbrella form of slope, avoid mixture splash mixing kettle 100 or direct and annular spraying plate 107 contact, influence annular spraying plate 107's the effect of spraying, the measure of taking is, the tip that stretches out compounding lifting cylinder 505 upper end at installation pole 506 is installed umbrella board 511, the shower water sprays in mixing kettle 100 through water shower joint 103, and the shower water sprays on the mixture that the rotation splashes, the mixture that the rotation splashes is rotatory and is gone out by the upper end of compounding lifting cylinder 505, and block through umbrella board 511 and the slope splashes downwards, make between the raw materials, all mix fully between raw materials and the water.

As a preferred embodiment of the present invention, the angle adjusting assembly is configured such that, as shown in fig. 9, the angle adjusting assembly includes a plurality of adjusting rods 400, the adjusting rods 400 are uniformly arranged along the circumferential direction of the adaptor 300, two ends of each adjusting rod 400 are respectively hinged to the adaptor 300 and the first connecting plate 203, or two ends of each adjusting rod 400 are respectively hinged to the adaptor 300 and the second connecting plate 502, and the adjustment of the inclination angle of the active material stirring mechanism in the mixing kettle 100 is achieved by adjusting the length of the adjusting rod 400. Wherein, adjust pole 400 including connecting rod 402 and two articulated rods 401, the one end that these two articulated rods 401 kept away from each other articulates respectively on the terminal surface of corresponding part, and threaded connection is close to the one end each other at two articulated rods 401 respectively at the both ends of connecting rod 402, through rotatory connecting rod 402, realizes being close to each other or keeping away from of two articulated rods 401.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The preparation method of the slag baking-free brick is characterized by comprising the following steps:

2. The method for preparing the slag baking-free brick according to claim 1, which is characterized by comprising the following steps: in step S5, the semi-dry blend is granulated into granules having a diameter of 5.0mm by a roll granulator.

3. The method for preparing the slag soil baking-free brick according to claim 1, which is characterized in that: the special mixing equipment comprises an end cover which is detachably connected to the upper end of the mixing kettle, a feed inlet and a water spray joint which are formed in the end cover, an active material overturning mechanism is installed in the mixing kettle, the lower end of the active material overturning mechanism extends out of the mixing kettle through an adapter, the adapter is connected with the active material overturning mechanism in an articulated mode, the adapter adjusts the angle between the adapter and the active material overturning mechanism through an angle adjusting component, the adapter is connected with the lower end of the mixing kettle in a rotating mode, and the rotating part is driven to drive the active material overturning mechanism to rotate.

4. The method for preparing the slag soil baking-free brick according to claim 3, which is characterized in that: a blanking hopper with the caliber gradually reduced downwards along the vertical direction is constructed in the end cover, a blanking cavity is formed between the feeding hole and the blanking hopper in the end cover, and a blanking port is formed at the small-diameter end of the blanking hopper; an annular spraying plate is constructed at the large-diameter end of the lower end face of the lower hopper, a spraying cavity is formed between the annular spraying plate and the corresponding surface of the end cover, the water spraying joint is communicated with the spraying cavity, spraying holes are fully distributed in the annular spraying plate, and the axial cross section of the annular spraying plate is of a circular arc-shaped structure protruding towards the active material overturning mechanism.

5. The method for preparing the slag soil baking-free brick according to claim 3, which is characterized in that: the adapter comprises a driving wheel which is coincident with the axis of the mixing kettle, a connecting sleeve is constructed at the upper end of the driving wheel, and the connecting sleeve is assembled at the lower end of the mixing kettle and is rotationally connected with the mixing kettle.

6. The method for preparing the slag baking-free brick according to claim 3, wherein the method comprises the following steps: active stirring mechanism includes the first row of feed cylinder that is formed with first globular connector on the outer peripheral face, in construct the bowl form groove that supplies the assembly of first globular connector on the adaptor, the below that just is located first globular connector on the outer peripheral face of first row of feed cylinder is constructed first connecting plate, angle adjusting component connects between first connecting plate and adaptor, has constructed spiral stirring vane in the upper end of first row of feed cylinder, spiral stirring vane extends along the axis of first row of feed cylinder, and spiral stirring vane's bore upwards expands gradually along vertical, can dismantle in the lower extreme of first row of feed cylinder and be connected with row material stopper.

7. The method for preparing the slag soil baking-free brick according to claim 6, wherein the method comprises the following steps: the pitch of the spiral stirring blade is increased progressively downwards along the vertical direction.

8. The method for preparing the slag soil baking-free brick according to claim 3, which is characterized in that: active stirring mechanism includes the row's of being formed with the globular connector of second on the outer peripheral face material portion of discharging, in be constructed the bowl form groove that supplies the assembly of the globular connector of second on the adaptor, in the compounding of the upper end intercommunication of material portion promotes the portion, in it has the compounding to pass through the mouth to construct between material portion of discharging and the compounding promotion portion.

9. The method for preparing the slag soil baking-free brick according to claim 8, wherein the method comprises the following steps: the discharging part comprises a second discharging cylinder, a second connecting plate is arranged on the outer peripheral surface of the second discharging cylinder and below the second spherical connector, the angle adjusting assembly is connected between the second connecting plate and the adaptor, a discharging joint is arranged on the lower part of the second discharging cylinder, and a control valve is arranged on the discharging joint; the compounding promotes the portion including setting up in the compounding of the second row of material section of thick bamboo upper end and promoting the section of thick bamboo, the axis coincidence of the compounding promotes a section of thick bamboo and a second row of material section of thick bamboo, and the bore that the compounding promoted a section of thick bamboo is greater than the bore that the second was arranged a material section of thick bamboo, coaxial coupling has the installation pole on the output shaft of a positive reverse motor, the position that the installation pole is located the second row of material section of thick bamboo and compounding promotion section of thick bamboo is constructed first helical blade and second helical blade respectively, just the one end that first helical blade and second helical blade are close to each other continues each other.

10. The method for preparing the slag baking-free brick according to claim 9, wherein the method comprises the following steps: the installation rod extends out of the end part of the upper end of the mixing lifting cylinder and is provided with an umbrella-shaped plate, the spraying water sprayed in the mixing kettle through the water spraying joint is sprayed on the mixture splashed in a rotating mode, the mixture splashed in a rotating mode rotates out from the upper end of the mixing lifting cylinder and is blocked by the umbrella-shaped plate to be splashed downwards in an inclined mode.