CN216884544U - High-doping-amount phosphogypsum paving brick production line - Google Patents
High-doping-amount phosphogypsum paving brick production line Download PDFInfo
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- CN216884544U CN216884544U CN202121287859.7U CN202121287859U CN216884544U CN 216884544 U CN216884544 U CN 216884544U CN 202121287859 U CN202121287859 U CN 202121287859U CN 216884544 U CN216884544 U CN 216884544U
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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
Abstract
The utility model provides a production line of phosphogypsum paving bricks, and a preparation method of a high-strength phosphogypsum block, which comprises the following components, by weight, 100 parts of neutralized dehydrated phosphogypsum, 0.5-5 parts of cement powder, 1-5 parts of silicate mineral powder, 0.5-5 parts of volcanic ash active powder, 0.1-0.2 part of retarder and 0.06-0.1 part of water-retaining agent; the water accounts for 9-13% of the weight ratio of the mixture; wherein the particle size of the silicate mineral powder and the volcanic ash active powder is less than 1 μm. Preparing a shell by using impervious cement concrete, and putting a high-strength phosphogypsum block material into the impervious cement concrete shell; feeding the top of the impermeable concrete, and pressing under 15-20 MPa to prepare the pavior brick; and (5) performing steam curing for 3-4 days to obtain the high-strength high-doping-amount phosphogypsum pavement brick. The production line for preparing the phosphogypsum paving brick is sequentially provided with a shell feeding station, a shell forming station, a lump material placing station, a top feeding station and a paving brick pressing station; the compression strength of the prepared pavement brick exceeds 30 MPa.
Description
Technical Field
The utility model relates to the field of phosphogypsum recycling, in particular to a production line of a high-content phosphogypsum pavement brick.
Background
Phosphogypsum is an industrial solid waste discharged in the process of wet-process phosphoric acid production. In wet process phosphoric acid production, 100% P is typically used per 1 ton of phosphoric acid produced2O5Calculated, about 4.5-5.5 tons of phosphogypsum are produced. The main component of the phosphogypsum is calcium sulfate dihydrate (CaSO)4•2H2O), and minor amounts of other impurities.
In the prior art, the scheme of sintering ardealite for making bricks, for example, the methods described in Chinese patent documents CN1381423A, CN1465540A, CN101774797A, CN102503517A, CN103044007A and the like, need to be continuously roasted at a high temperature of 700-900 ℃ for not less than 30 hours. In addition, the compression molding process, such as CN102172968A and CN104030649A, wherein the process described in CN104030649A can obtain phosphogypsum bricks with compressive strength over 25MPa, but the compressive strength of the phosphogypsum bricks is reduced after meeting water again, and is only 10-12 MPa.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a production line of the phosphogypsum paving bricks, which can improve the preparation efficiency and quality of the phosphogypsum paving bricks.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a production line of ardealite paving bricks is sequentially provided with a shell feeding station, a shell forming station, a lump material placing station, a top feeding station and a paving brick pressing station;
the shell feeding station is used for partially filling impervious cement concrete in the pavement brick bottom mould;
the shell forming station is used for extruding an inner cavity which is provided with a bottom wall, four side walls and an open top on the impervious cement concrete;
the block placing station is used for placing the prepared high-strength phosphogypsum block into an inner cavity formed by impervious cement concrete in the pavement brick bottom mould;
the top feeding station is used for filling the residual impervious cement concrete in the pavement brick bottom mould;
the pavior brick pressing station is used for pressing and molding the pavior brick.
In the preferred scheme, the shell feeding station, the shell forming station, the lump material placing station and the top feeding station are located on a first conveying device, a second conveying device is arranged on one side of the shell feeding station, a first feed inlet is formed above the tail end of the second conveying device and used for filling impervious cement concrete, a first side pushing cylinder is further arranged at the tail end of the second conveying device and used for pushing the pavement brick bottom mould to the head end of the first conveying device.
In the preferred scheme, a forming cylinder is arranged above the shell forming station and is fixedly connected with a forming head in a shape like a Chinese character 'tu'.
In the preferred scheme, one side of a station for placing the lump materials is provided with a lump material conveying manipulator which is a joint mechanical arm, the end of the lump material conveying manipulator is provided with a clamping claw, the claw body of the clamping claw is provided with at least two moving claws which are in a group, and the claw body is also provided with a vertically telescopic pushing cylinder.
In the preferred scheme, a second feeding hole is formed above the top feeding station and used for filling impervious cement concrete on the top surface of the pavement brick bottom mould.
In the preferred scheme, a second side pushing cylinder is arranged on one side of the tail end of the first conveying device, a pavement brick pressing table is arranged on the other side of the tail end of the first conveying device, a positioning block is arranged on the pavement brick pressing table, a third side pushing cylinder is arranged at one end of the pavement brick pressing table, and the second side pushing cylinder and the third side pushing cylinder enable the pavement brick bottom mold to abut against the positioning block along the directions of the x axis and the y axis.
In the preferred scheme, a pavement brick press is arranged above the pavement brick pressing platform, and a pavement brick top die is arranged between a pressing head of the pavement brick press and the pavement brick bottom die.
In the preferable scheme, a third conveying device is further arranged on one side of the block material placing station, a third feeding port is arranged above the third conveying device and used for filling the phosphogypsum press material into the block material bottom mold, a block material press is arranged on the downstream of the third feeding port, and a block material top mold is arranged between a pressing head of the block material press and the block material bottom mold.
According to the production line of the phosphogypsum pavement brick, the high-strength phosphogypsum block and the shell prepared from impervious cement concrete can be simultaneously pressed through the shell feeding station, the shell forming station, the block placing station, the top feeding station and the pavement brick pressing station, so that the high-doping-amount and high-strength phosphogypsum pavement brick is obtained, and the impervious cement concrete can play a role in controlling the water inflow of the high-strength phosphogypsum block, so that the service life of the phosphogypsum pavement brick is greatly prolonged.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a front view of a paving brick production line of the present invention.
FIG. 2 is a top view of the paving brick production line of the present invention.
FIG. 3 is a schematic view of the construction of the paving brick of the present invention.
In the figure: the paving brick bottom mould comprises a paving brick bottom mould 1, a first conveying device 2, a forming cylinder 3, a support 4, a clamping claw 5, a moving claw 51, a claw body 52, a pushing cylinder 53, an impervious concrete shell 6, a high-strength ardealite block 7, a paving brick press 8, a paving brick top mould 9, a top scraper 10, a second feeding hole 11, a positioning block 12, a top pushing block 13, a first feeding hole 14, a third sensor 15, a first sensor 16, a second sensor 17, a paving brick pressing platform 18, a second conveying device 19, a block conveying manipulator 20, a block bottom mould 21, a block press 22, a top scraper cylinder 23, a third conveying device 24, impervious concrete 25, a third feeding hole 26, a first side pushing cylinder 27, a second side pushing cylinder 28, a third side pushing cylinder 29, a shell feeding station 30, a shell forming station 31, a brick putting station 32, a top feeding station 33 and a paving brick pressing station 34.
Detailed Description
Example 1:
the components in parts by weight are as follows: 1000 g of neutralized and dehydrated phosphogypsum, 5 g of cement powder, 10 g of silicate mineral powder, 5 g of volcanic ash active powder, 1 g of retarder and 0.6 g of water-retaining agent;
the water accounts for 9 percent of the weight of the mixture;
wherein the particle size of the silicate mineral powder and the volcanic ash active powder is less than 1 μm.
The neutralized dehydrated phosphogypsum material is a hemihydrate phosphogypsum neutralized material prepared by mixing quicklime, and is a product sold by Hubei Sanning chemical industry Co.
The cement powder is ordinary C30 cement.
The silicate mineral powder is hydrated silicate nano-powder. The average particle size is less than 1 μm. Preferably, the average particle size is less than 500 nm. Further preferred average particle sizes are less than 100 nm.
The specific surface area of the volcanic ash active powder is more than or equal to 12000m2/kg，SiO2The mass content is more than or equal to 80 percent, and the average grain diameter is less than 1 mu m. Preferably, the average particle size is less than 500 nm. Further preferred average particle sizes are less than 100 nm.
The retarder is preferably sodium citrate. Another alternative is barium chloride.
In order to ensure complete hydration, no water reducing agent is added to the ingredients. The water-retaining agent improves the hydration complete effect of each component.
The preparation steps are as follows:
s1, fully mixing the neutralized and dehydrated phosphogypsum, silicate mineral powder and volcanic ash active powder to obtain a phosphogypsum mixture;
s2, cement powder, a retarder and part of water are fully mixed, then fully mixed with the phosphogypsum mixture, and finally, the rest water and the water-retaining agent are added and mixed to obtain the phosphogypsum pressing material;
s3, pressing under 15MPa to prepare a block sample;
the high-strength ardealite block is obtained through the steps. The high-strength ardealite block finished product is black gray in appearance, smooth and fine in surface and crisp in knocking sound. Through detection, the compressive strength of the high-strength phosphogypsum block material obtained by the scheme is 23MPa, and the accumulation of a cementing material can be seen among gypsum crystal gaps.
Example 2:
the components in parts by weight are as follows: 1000 g of neutralized and dehydrated phosphogypsum, 30 g of cement powder, 20 g of silicate mineral powder, 30 g of volcanic ash active powder, 2 g of retarder, 10 g of water-retaining agent and 20 g of fiber;
the fiber is polyvinyl alcohol fiber;
the water accounts for 11 percent of the weight of the mixture;
s1, fully mixing the neutralized and dehydrated phosphogypsum, silicate mineral powder and volcanic ash active powder to obtain a phosphogypsum mixture;
s2, fully scattering the fibers by a shear pump, fully mixing the fibers, cement powder, a retarder and water with the total water amount of 20% when the length of the fibers is 5-10 mm, fully mixing the fibers, the cement powder, the retarder and the water with the total water amount of 20%, fully mixing the mixture with the phosphogypsum mixture, and finally adding the rest water and a water-retaining agent to mix to obtain a phosphogypsum pressing material;
s3, pressing under 20MPa to prepare a block sample;
the high-strength ardealite block is obtained through the steps. The detection shows that the compressive strength of the high-strength phosphogypsum block obtained by the scheme is 28.7 MPa.
Example 3:
the high-strength phosphogypsum block in the example 3 is taken as a core material, and the preparation method of the paving brick comprises the following steps:
s01, preparing a shell by using impervious cement concrete, wherein the shell comprises a bottom wall and four side walls, and the size of an inner cavity formed by the bottom wall and the four side walls is the same as that of a high-strength phosphogypsum block to be placed; in the preferred scheme, the impervious cement concrete comprises the following components in parts by weight: 100 parts of portland cement, 10 parts of fly ash, 5 parts of silica fume, 5 parts of steel slag powder, 100 parts of river sand, 10 parts of acrylate emulsion, 0.1 part of cellulose ether, 0.1 part of polyacrylamide, 0.5 part of water reducing agent, 0.5 part of polyvinyl alcohol resin and 20 parts of water. In a preferred embodiment, the polyvinyl alcohol resin is Ca (NO) at a concentration of 4%3)2Soaking in the solution for 12h to form a water-resistant film on the surface of the polyvinyl alcohol resin so as to ensure thatThe initial swelling time of the polyvinyl alcohol resin is higher than 48 h. The portland cement is C30 cement.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
S02, placing a high-strength phosphogypsum block 7 in the impervious cement concrete shell 6;
s03, feeding the impermeable concrete from the top, and pressing under 15MPa to form the pavior brick;
and S04, steam curing for 4 days to obtain the high-strength high-doping-amount phosphogypsum paving brick shown in the figure 3. The compressive strength of the obtained pavement brick is 30.5 Mpa. After soaking in water for 24 hours, the compressive strength of the pavement brick is not obviously reduced.
Example 4:
with the high strength phosphogypsum block of example 2 as core material,
s01, preparing a shell by using impervious cement concrete, wherein the shell comprises a bottom wall and four side walls, and the size of an inner cavity formed by the bottom wall and the four side walls is the same as that of a high-strength phosphogypsum block to be placed; in the preferred scheme, the impervious cement concrete comprises the following components in parts by weight: 100 parts of portland cement, 20 parts of fly ash, 10 parts of silica fume, 10 parts of steel slag powder, 250 parts of river sand, 50 parts of acrylate emulsion, 1.0 part of cellulose ether, 1 part of polyacrylamide, 1 part of water reducing agent and 1 part of polyvinyl alcohol resin. In a preferred embodiment, the polyvinyl alcohol resin is Ca (NO) at a concentration of 4%3)2Soaking in the solution for 20h to make the initial swelling time of polyvinyl alcohol resin be higher than 48 h.
S02, placing a high-strength phosphogypsum block 7 in the impervious cement concrete shell 6;
s03, feeding the top of the impermeable concrete, and pressing under 20MPa to form the pavior brick;
and S04, steam curing for 4 days to obtain the high-strength high-doping-amount phosphogypsum paving brick shown in the figure 3. The compressive strength of the obtained pavement brick is 33 Mpa. After soaking in water for 24 hours, the compressive strength of the pavement brick is not obviously reduced.
Example 5:
examples 1-4 are process routes of the present invention, and understanding the process routes is helpful for a better understanding of the apparatus of the present invention. As shown in fig. 1-2, a production line for preparing the phosphogypsum paving brick is sequentially provided with a shell feeding station 30, a shell forming station 31, a block placing station 32, a top feeding station 33 and a paving brick pressing station 34;
the shell feeding station 30 is used for partially filling impervious cement concrete in the pavement brick bottom mould 1;
the shell forming station 31 is used for extruding an inner cavity with a bottom wall and four side walls and an open top on impervious cement concrete;
the block placing station 32 is used for placing the prepared high-strength phosphogypsum block 7 into an inner cavity formed by impervious cement concrete in the pavement brick bottom mould 1;
the top feeding station 33 is used for filling the residual impervious cement concrete in the pavement brick bottom mould 1;
the pavior brick pressing station 34 is used for pressing and molding pavior bricks.
In a preferred scheme, as shown in fig. 1-2, a shell feeding station 30, a shell forming station 31, a block placing station 32 and a top feeding station 33 are positioned on a first conveying device 2, and the first conveying device 2 is preferably a metal conveying belt. In another preferred scheme, the first conveying device 2 is of a platform structure, a hydraulic cylinder is arranged at one end of the platform structure, fixed-length isolation blocks are arranged among the road brick bottom molds 1, and the hydraulic cylinder pushes the road brick bottom molds 1 to move for a certain distance each time.
A second conveying device 19 is arranged on one side of the shell feeding station 30, a belt conveyor is adopted by the second conveying device 19, a first feeding hole 14 is formed above the tail end of the second conveying device 19 and used for filling impervious cement concrete, the impervious cement concrete is fed in a precise weighing or volume measuring mode, a first side pushing cylinder 27 is further arranged at the tail end of the second conveying device 19 and used for pushing the pavement brick bottom mold 1 to the head end of the first conveying device 2, and the pavement brick bottom mold 1 is composed of a side mold and a bottom mold and is convenient to demold;
a forming cylinder 3 is arranged above the shell forming station 31, the forming cylinder 3 is fixedly connected with the convex-shaped forming head and is used for pressing an inner cavity for containing a high-strength phosphogypsum block 7 in impervious cement concrete in the pavement brick bottom mould 1; as shown in fig. 1.
As shown in fig. 2, a block conveying manipulator 20 is arranged on one side of the block placing station 32, the block conveying manipulator 20 is a joint mechanical arm, a clamping jaw 5 is arranged at the end of the block conveying manipulator 20, at least two moving jaws 51 in a group are arranged on a jaw body 52 of the clamping jaw 5, the moving jaws 51 are driven by a screw nut mechanism to move relatively, a vertically telescopic pushing cylinder 53 is further arranged on the jaw body 52, and a pushing block is arranged at the end of the pushing cylinder 53 and used for assisting in pressing the high-strength phosphogypsum block 7 into an inner cavity of the impervious concrete shell 6;
a second feeding hole 11 is formed above the top feeding station 33, the second feeding hole 11 is used for filling impervious cement concrete, and the impervious cement concrete filled in the second feeding hole is used for forming a top cover of the pavement brick;
be equipped with second side at first conveyor 2's tail end one side and push away cylinder 28, the opposite side is equipped with pavior brick pressure platform 18, be equipped with locating piece 12 on the pavior brick pressure platform 18, locating piece 12 is used for making the pavior brick end mould 1 and the pavior brick on the pavior brick press 8 top mould 9 accurate alignment, the one end of pavior brick pressure platform 18 is equipped with third side and pushes away cylinder 29, second side pushes away cylinder 28 and third side and pushes away cylinder 29 and makes the pavior brick end mould 1 support and lean on locating piece 12 along the direction of x axle and y axle, be equipped with pavior brick press 8 in the top of pavior brick pressure platform 18, be equipped with pavior brick top mould 9 between the pressure head of pavior brick press 8 and the pavior brick end mould 1.
At least the shell forming station 31, the block placing station 32 and the top feeding station 33 are respectively provided with a first sensor 16, a second sensor 17 and a third sensor 15 for detecting the position of the pavement brick bottom mold 1. Preferably, the first sensor 16, the second sensor 17 and the third sensor 15 employ photoelectric sensors.
In a preferred scheme, as shown in fig. 2, a third conveying device 24 is further arranged on one side of the block material placing station 32, a third feeding port 26 is arranged above the third conveying device 24, the third feeding port 26 is used for filling the phosphogypsum pressing material into the block material bottom mold 21, a block material press 22 is arranged on the downstream of the third feeding port 26, and a block material top mold is arranged between a pressing head of the block material press 22 and the block material bottom mold 21. The structure is used for pressing high-strength phosphogypsum blocks 7.
On the basis of the embodiments 1 to 5, the processing method of the production line comprises the following steps: in the second conveying device 19, impervious cement concrete is added into the pavement brick bottom mould 1 from the first feed port 14, and 1/2 with the height equal to the height of the inner cavity of the pavement brick bottom mould 1 is added. The first side pushing cylinder 27 pushes the pavement brick bottom mould 1 onto the first conveying device 2, and the convex-shaped forming head of the forming cylinder 3 is pressed downwards through the shell forming station 31 to form an impervious concrete shell 6;
meanwhile, the block bottom die 21 is added with the phosphogypsum pressing material through the third feeding port 26, the block bottom die 21 moves to the position below the block pressing machine 22, the block top die on the block pressing machine 22 is pressed downwards, the phosphogypsum pressing material is pressed into the high-strength phosphogypsum block 7 at 15-20 MPa, and the high-strength phosphogypsum block 7 is conveyed to the position corresponding to the block placing station 32 after being demoulded. The pavement brick bottom mould 1 moves to a block placing station 32, the second sensor 17 detects the accurate position, the block conveying manipulator 20 acts, the clamping claw 5 moves to the position above the prepared high-strength phosphogypsum block 7, the moving claws 51 move oppositely to grab the high-strength phosphogypsum block 7, the clamping claw 5 moves to the position above the pavement brick bottom mould 1 of the block placing station 32, the moving claws 51 move oppositely to enable the high-strength phosphogypsum block 7 to fall into the impervious concrete shell 6, and the pushing cylinder 53 acts to compact the high-strength phosphogypsum block 7. The pavement brick bottom mould 1 moves to the position below the second feeding hole 11, impervious cement concrete is filled, the top scraper blade cylinder 23 acts to drive the top scraper blade 10 to scrape the top of the pavement brick bottom mould 1, and the impervious cement concrete is scraped. The pavement brick bottom mold 1 moves to a pavement brick pressing station 34, the second side pushing cylinder 28 acts to push the pavement brick bottom mold 1 to be tightly attached to one side of the positioning block 12, the positioning block 12 is arranged in an L shape, two sides of the positioning block 12 are respectively opposite to the second side pushing cylinder 28 and the third side pushing cylinder 29, and the third side pushing cylinder 29 acts to push the pavement brick bottom mold 1 to be tightly attached to the other side of the positioning block 12. The pressure head of the paving brick press 8 is lowered, and the paving brick top die 9 is pressed in the paving brick bottom die 1 to press and form the paving bricks. And demolding, and steam curing for 4 days to obtain the pavior brick. The pavement brick phosphogypsum mixing amount exceeds more than 60 percent, the appearance is regular, the outer wall is smooth, the compressive strength reaches 33Mpa, and the compressive strength is not obviously reduced after soaking in water. The problem that the phosphogypsum pavement bricks cannot resist water soaking is reliably solved. Where splicing is required, it is recommended to use ordinary C30 cement pressed bricks.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.
Claims (8)
1. A high-doping-amount phosphogypsum paving brick production line is characterized in that: the production line is sequentially provided with a shell feeding station (30), a shell forming station (31), a lump material placing station (32), a top feeding station (33) and a paving brick pressing station (34);
the shell feeding station (30) is used for partially filling impervious cement concrete in the pavement brick bottom mould (1);
the shell forming station (31) is used for extruding an inner cavity which is provided with a bottom wall and four side walls and is provided with an open top on the impervious cement concrete;
the block placing station (32) is used for placing the prepared high-strength phosphogypsum block (7) into an inner cavity formed by impervious cement concrete in the pavement brick bottom mould (1);
the top feeding station (33) is used for filling the residual impervious cement concrete in the pavement brick bottom mould (1);
the pavior brick pressing station (34) is used for pressing and molding the pavior bricks.
2. The production line of the high-doped phosphogypsum paving brick as claimed in claim 1, which is characterized in that: the concrete brick paving machine comprises a shell feeding station (30), a shell forming station (31), a block placing station (32) and a top feeding station (33) are located on a first conveying device (2), a second conveying device (19) is arranged on one side of the shell feeding station (30), a first feed inlet (14) is formed above the tail end of the second conveying device (19) and used for filling impervious cement concrete, a first side pushing cylinder (27) is further arranged at the tail end of the second conveying device (19), and the first side pushing cylinder (27) is used for pushing a pavement brick bottom mold (1) to the head end of the first conveying device (2).
3. The production line of the high-doped phosphogypsum paving brick as claimed in claim 2, which is characterized in that: a forming cylinder (3) is arranged above the shell forming station (31), and the forming cylinder (3) is fixedly connected with the convex forming head.
4. The production line of the high-doped phosphogypsum paving brick as claimed in claim 2, which is characterized in that: one side of the block material placing station (32) is provided with a block material conveying manipulator (20), the block material conveying manipulator (20) is a joint manipulator, the end of the block material conveying manipulator (20) is provided with a clamping jaw (5), at least two moving jaws (51) in a set are arranged on a jaw body (52) of the clamping jaw (5), and a vertically telescopic pushing cylinder (53) is further arranged on the jaw body (52).
5. The production line of the high-doped phosphogypsum paving brick as claimed in claim 2, which is characterized in that: and a second feeding hole (11) is formed above the top feeding station (33), and the second feeding hole (11) is used for filling impervious cement concrete on the top surface of the pavement brick bottom mould (1).
6. The production line of high-doped phosphogypsum paving brick as claimed in claim 2, characterized in that: the second side pushing cylinder (28) is arranged on one side of the tail end of the first conveying device (2), the pavement brick pressing table (18) is arranged on the other side of the tail end of the first conveying device, a positioning block (12) is arranged on the pavement brick pressing table (18), a third side pushing cylinder (29) is arranged at one end of the pavement brick pressing table (18), and the second side pushing cylinder (28) and the third side pushing cylinder (29) enable the pavement brick bottom mold (1) to abut against the positioning block (12) along the directions of the x axis and the y axis.
7. The production line of the high-doped phosphogypsum paving brick as claimed in claim 6, which is characterized in that: a pavement brick press (8) is arranged above the pavement brick pressing platform (18), and a pavement brick top die (9) is arranged between a pressing head of the pavement brick press (8) and the pavement brick bottom die (1).
8. The production line of high-doped phosphogypsum paving bricks according to claim 4, which is characterized in that: a third conveying device (24) is further arranged on one side of the block material placing station (32), a third feeding port (26) is arranged above the third conveying device (24), the third feeding port (26) is used for filling ardealite pressing materials into the block material bottom die (21), a block material pressing machine (22) is arranged on the downstream of the third feeding port (26), and a block material top die is arranged between a pressing head of the block material pressing machine (22) and the block material bottom die (21).
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| CN202121287859.7U CN216884544U (en) | 2021-06-09 | 2021-06-09 | High-doping-amount phosphogypsum paving brick production line |
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| CN202121287859.7U CN216884544U (en) | 2021-06-09 | 2021-06-09 | High-doping-amount phosphogypsum paving brick production line |
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