High-pressure hot braising device for compact free calcium oxide on surfaces of waste ladle bricks

Abstract

The utility model belongs to the technical field of removal of dense free calcium oxide on the surface of a waste ladle brick, and discloses a high-pressure hot-stewing device for dense free calcium oxide on the surface of a waste ladle brick, which is fixedly arranged at a corresponding position on the right side of a telescopic mechanism bracket, and a hopper is fixedly arranged at the upper part of a chain scraper conveyor; the chain scraper conveyor is fixedly arranged at the bottom of the high-pressure hot stewing box; the booster pump is longitudinally and fixedly arranged at the bottom of the left side of the telescopic mechanism bracket; the pressure sensor is fixedly arranged at the lower part, close to the left side, of the H-shaped steam pipe on the front side of the high-pressure hot-stewing box; the thermocouple is fixedly arranged on the left side of the pressure sensor, and the anti-explosion valve is fixedly arranged on the right side of the pressure sensor. The device has the beneficial effects that free calcium oxide on the surface of the waste ladle brick is digested into calcium hydroxide, the digestion rate of the free calcium oxide on the surface is up to 95%, and meanwhile, the expansion rate of the crushed refractory raw material of the ladle brick is reduced to 1.5%.

Description

Technical Field

[0001] This utility model belongs to the field of technology for digesting dense free calcium oxide on the surface of waste steel ladle bricks, specifically relating to a high-pressure hot curing device for digesting dense free calcium oxide on the surface of waste steel ladle bricks. Background Technology

[0002] Waste ladle bricks are refractory bricks removed from the inner surface of a steel ladle after maintenance. Because the steel ladle is used to transport molten steel, it undergoes high-temperature sintering over a long period, forming a dense mineral phase layer. This layer mainly consists of tricalcium silicate (C3S), dicalcium silicate (C2S), and solid solutions formed by FeO, MgO, and MnO. The free calcium oxide (f-CaO) layer, in particular, undergoes a slow hydration reaction at room temperature, requiring several years, and has a volume expansion rate as high as 98%. If this dense free calcium oxide layer is not treated, the mineral phase layer of the waste ladle bricks cannot be removed or crushed, making it impossible to process the waste ladle brick refractory raw materials and thus preventing the waste ladle bricks from achieving the purpose of waste recycling.

[0003] In waste steel ladle brick refractory raw materials, due to the high volume expansion rate of free calcium oxide, refractory bricks pressed from these raw materials are prone to cracking and even pulverization during use due to the presence of free calcium oxide. Free calcium oxide is a harmful substance in waste steel ladle brick refractory raw materials; therefore, the dense free calcium oxide on the surface of the waste steel ladle bricks must be dissolved to meet the process requirements of the refractory raw materials.

[0004] The disposal of free calcium oxide on the surface of waste steel ladle bricks has long been a technical challenge in the industry. Current methods involve spraying high-temperature water onto the surface, which accelerates the disposal of free calcium oxide, but the speed is insufficient and cannot meet the process requirements for refractory materials from waste steel ladle bricks. To address these shortcomings, the inventors have developed a high-pressure thermal quenching device for the dense free calcium oxide on the surface of waste steel ladle bricks, enabling rapid disposal of this dense free calcium oxide. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides a high-pressure hot quenching device for removing dense free calcium oxide from the surface of waste steel ladle bricks. This invention features a scientifically sound and simple structural design. Utilizing the principle of high-pressure hot quenching, it uses the waste heat from a tunnel kiln to generate high-temperature steam in a steam box. A booster pump then pressurizes the steam in the steam box and inputs it into the hot quenching chamber to perform high-pressure hot quenching and decomposition treatment on the dense free calcium oxide on the surface of the waste steel ladle bricks. This process decomposes the free calcium oxide on the surface of the waste steel ladle bricks into calcium hydroxide, reducing the expansion rate of the refractory material from the waste steel ladle bricks.

[0006] The technical solution adopted in this utility model is as follows: a high-pressure heat treatment device for dense free calcium oxide on the surface of waste steel ladle bricks, including a telescopic mechanism support, a base plate, and an upper plate. The telescopic mechanism support has a square structure, with a vertical plate vertically installed on the upper left side. The base plate is horizontally fixed at the bottom right side of the vertical plate of the telescopic mechanism support, and the upper plate is fixedly installed on the upper part of the base plate. The telescopic mechanism is divided into a lower telescopic mechanism and an upper telescopic mechanism. The lower telescopic mechanism is fixedly installed at the middle upper part of the base plate, and the upper telescopic mechanism is fixedly installed at the middle upper part of the upper plate. The high-pressure heat treatment device is fixedly installed at the corresponding position on the right side of the telescopic mechanism support. The high-pressure heat treatment device includes a support plate, which is fixedly installed at the middle front and rear sides of the high-pressure heat treatment chamber. The high-pressure heat treatment chamber is a cuboid with openings at the top and bottom. The high-pressure heat treatment chamber uses waste heat to generate steam and perform high-pressure heat treatment to dissolve the free calcium oxide on the surface of the waste steel ladle bricks. The upper cover is slidably installed on the upper part of the high-pressure heat treatment chamber, and the lower cover is slidably installed at the bottom of the high-pressure heat treatment chamber. The sliding bodies are symmetrically fixed. Four raised strips are provided on the front and rear sides of the upper and lower covers, in groups of two. One group is symmetrically arranged on the upper front and rear sides of the high-pressure hot braising box, and the other group is fixedly arranged on the lower front and rear sides of the high-pressure hot braising box. The raised strips are slidably installed in the sliding body. The H-shaped steam pipe passes through the upper part of the support plate and is fixedly arranged on the front and rear sides of the high-pressure hot braising box near the left side. The steam pipe flange is fixedly arranged on the right end of the upper horizontal pipe of the H-shaped steam pipe. The waste heat inlet pipe is located on the lower right side of the high-pressure hot braising box, the steam outlet pipe is located on the upper part of the waste heat inlet pipe, and the water injection pipe is fixedly arranged on the upper right rear side of the high-pressure hot braising box. A hopper is fixedly arranged on the upper part of the chain conveyor, and the chain conveyor is fixedly arranged at the bottom of the high-pressure hot braising box. The booster pump is fixedly arranged longitudinally on the lower left side of the telescopic mechanism support. The pressure sensor is fixedly arranged on the lower left side of the front H-shaped steam pipe of the high-pressure hot braising box. The thermocouple is fixedly arranged on the left side of the pressure sensor, and the explosion-proof valve is fixedly arranged on the right side of the pressure sensor.

[0007] The bottom plate and the top plate are arranged parallel to each other vertically; sealing gaskets are provided at the edges of the contact surfaces between the top cover and the bottom cover and the high-pressure hot curing chamber.

[0008] The telescopic mechanism includes support blocks, which are symmetrically arranged on the upper middle part of the base plate or the upper plate. A hydraulic push rod is fixedly arranged on the symmetrically arranged support blocks. A U-shaped push plate is fixedly arranged on the right end of the telescopic rod of the hydraulic push rod, and the longitudinal center of the U-shaped push plate is fixed to the right end of the telescopic rod of the hydraulic push rod. The push rod is symmetrically arranged on both sides of the U-shaped push plate. The hydraulic push rod is fixedly connected to the pump valve of the hydraulic station.

[0009] The support plate includes a support plate body, which is L-shaped. Strip-shaped heat dissipation holes are evenly opened on the side of the support plate body to dissipate the heat generated by the free calcium oxide on the surface of the waste steel ladle bricks under high pressure heat treatment.

[0010] The high-pressure hot braising chamber includes a V-shaped partition plate, which is located inside the high-pressure hot braising chamber near the right side. A sealing plate is fixedly installed on the bottom and top right side of the V-shaped partition plate, and the right end of the sealing plate is fixed to the right inner wall of the high-pressure hot braising chamber. The V-shaped partition plate and the sealing plate are integrally formed. The left side of the V-shaped partition plate is the hot braising chamber, and the right side is the steam chamber. The steam chamber uses the tunnel kiln preheating to heat water to form steam.

[0011] The slider includes a slider body, which is elongated. A sliding groove is formed on the lower inner side of the slider body and extends through the slider body. A convex strip is slidably fitted in the sliding groove.

[0012] The right end of the push rod is positioned above or below the sliding body, and the push rod and the sliding body are arranged horizontally from left to right.

[0013] The H-type steam pipe includes an H-type steam pipe body. Short steam pipes are evenly arranged on the inner side of the upper and lower horizontal pipes of the H-type steam pipe body. The short steam pipes are connected to the interior of the high-pressure hot curing box, and the short steam pipes are connected to the H-type steam pipe body.

[0014] The steam pipe flange is connected to the output end of the booster pump via a steam pipe, and the input end of the booster pump is fixedly connected to the steam discharge pipe; the waste heat inlet pipe is connected to the waste heat outlet pipe of the tunnel kiln via a waste heat conveying pipeline, and the water injection pipe is fixedly connected to the output port of the water injection pump via a water injection pipe.

[0015] The hopper has a large opening at the top and a small opening at the bottom, with an opening at the right end. The opening at the bottom of the hopper is larger than the width of the chain conveyor chain, and the length of the hopper is greater than the length of the high-pressure hot curing chamber.

[0016] The pressure sensor is located on the front side of the hot braising box near the left end, the thermocouple is located to the left of the pressure sensor, and the explosion-proof valve is located to the right of the pressure sensor. The pressure sensor and thermocouple are used to monitor the pressure and temperature inside the hot braising box in real time. The explosion-proof valve prevents the hot braising box from exploding due to excessive steam pressure or gas pressure generated by the decomposition of free calcium oxide on the surface of waste steel ladle bricks.

[0017] The working process of this high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks is as follows: First, the operator starts the water injection pump and injects water into the steam box of the high-pressure hot curing chamber through the water injection pipe. When the water level in the steam box reaches two-thirds, the water injection is stopped. At this time, the valve of the waste heat introduction pipe is opened, and the medium and high temperature air waste heat from the tunnel kiln enters the steam box through the waste heat introduction pipe, heating the water in the steam box to boiling and generating high-temperature steam. The steam is then pressurized by the booster pump, which evenly inputs the high-temperature steam into the hot curing chamber through the short steam pipe of the H-shaped steam pipe, raising the temperature to 50~65℃. At this time, the operator starts the hydraulic push rod of the upper telescopic mechanism through the control switch of the upper telescopic mechanism. The telescopic rod of the hydraulic push rod extends, pushing the upper telescopic mechanism. The U-shaped push plate and push rod move to the right. At this time, under the push of the push rod, the sliding grooves of the upper cover and the sliding bodies on the front and rear sides are pushed to the right along the convex strip. When the extension rod of the hydraulic push rod is extended to its maximum limit, the left end of the upper cover moves to the right edge of the hot braising box. At this time, the waste steel ladle bricks are transported into the hot braising box by the belt conveyor. After the waste steel ladle bricks in the hot braising box reach three-quarters of the material level, the operator starts the hydraulic push rod of the upper extension mechanism again. The extension rod of the hydraulic push rod retracts, driving the U-shaped push plate and push rod to the left, and finally driving the upper cover to slide to the left, closing the hot braising box. At this time, the waste steel ladle bricks in the hot braising box are hot braising in high temperature steam and high pressure for one and a half to three hours. After the high-pressure hot curing of waste ladle bricks is completed, the operator first starts the chain conveyor to put it into operation. At this time, the operator repeats the same extension action as the upper telescopic mechanism and controls the lower telescopic mechanism to slide the lower cover. When the lower cover moves to the right edge of the curing chamber, the waste ladle bricks, after high-pressure hot curing, fall onto the chain conveyor through the hopper by their own gravity. The chain conveyor transports the waste ladle bricks that have undergone the dissolution treatment to the next crushing process. The free calcium oxide on the surface of the waste ladle bricks hydrates to form calcium hydroxide, and the dissolution of the free calcium oxide on the surface is as high as 95%. At the same time, the expansion rate of the refractory raw material of the crushed ladle bricks is reduced to 1.5%.

[0018] The beneficial effects of this utility model are as follows: by setting up a telescopic mechanism, a lower telescopic mechanism, an upper telescopic mechanism, a high-pressure hot quenching device, a chain conveyor, a hopper, a booster pump, a pressure sensor, a thermocouple, and an explosion-proof valve, the free calcium oxide on the surface of the waste steel ladle bricks is decomposed into calcium hydroxide by high-pressure and high-temperature steam through the principle of high-pressure hot quenching. The decomposition of free calcium oxide on the surface is as high as 95%, and at the same time, the expansion rate of the refractory raw material of the crushed steel ladle bricks is reduced to 1.5%. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This utility model Figure 1 A schematic diagram of the structure in the rear-view direction;

[0021] Figure 3 This is a schematic diagram of the telescopic mechanism of this utility model;

[0022] Figure 4 This is a schematic diagram of the high-pressure heat-quenching device of this utility model;

[0023] Figure 5 This is a cross-sectional view of the high-pressure hot simmering device of this utility model;

[0024] Figure 6 This is a schematic diagram of the chain conveyor and hopper of this utility model;

[0025] Markings in the diagram: 1. Telescopic mechanism support; 2. Base plate; 3. Top plate; 4. Telescopic mechanism; 41. Support block; 42. Hydraulic push rod; 43. U-shaped push plate; 44. Push rod; 5. Lower telescopic mechanism; 6. Upper telescopic mechanism; 7. High-pressure heat preservation device; 71. Support plate; 711. Support plate body; 712. Strip-shaped heat dissipation hole; 72. High-pressure heat preservation chamber; 721. V-shaped partition plate; 722. Sealing plate; 723. Heat preservation chamber; 724. Steam. Box, 73. Top cover, 74. Bottom cover, 75. Sliding body, 751. Sliding body body, 752. Sliding groove, 76. Raised strip, 77. H-type steam pipe, 771. H-type steam pipe body, 772. Steam short pipe, 78. Steam pipe flange, 79. Waste heat inlet pipe, 710. Steam outlet pipe, 711. Water injection pipe, 8. Chain conveyor, 9. Hopper, 10. Booster pump, 11. Pressure sensor, 12. Thermocouple, 13. Explosion-proof valve. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0027] This utility model provides a high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks:

[0028] like Figure 1 , 2As shown in Figure 3, a vertical plate is vertically installed on the upper left side of the telescopic mechanism support 1; a base plate 2 is horizontally fixed at the bottom right side of the vertical plate of the telescopic mechanism support 1, and an upper plate 3 is fixedly installed on the upper part of the base plate 2; the telescopic mechanism 4 is divided into a lower telescopic mechanism 5 and an upper telescopic mechanism 6, with the lower telescopic mechanism 5 fixedly installed at the middle upper part of the base plate 2 and the upper telescopic mechanism 6 fixedly installed at the middle upper part of the upper plate 3; the telescopic mechanism 4 includes a support block 41, which is symmetrically arranged on the middle upper part of either the base plate 2 or the upper plate 3; a hydraulic push rod 42 is fixedly installed on the symmetrically arranged support block 41; a U-shaped push plate 43 is fixedly installed at the right end of the telescopic rod of the hydraulic push rod 42, with the longitudinal center of the U-shaped push plate 43 fixed to the right end of the telescopic rod of the hydraulic push rod 42; and push rods 44 are symmetrically fixed on both sides of the U-shaped push plate 43.

[0029] The above-mentioned lower telescopic mechanism 5 and upper telescopic mechanism 6 enable independent opening and closing control of the upper cover 73 and lower cover 74 of the high-pressure hot quenching device 7. On the one hand, when it is necessary to transport waste steel ladle bricks into the hot quenching box 423, the upper cover 73 can be opened independently. On the other hand, after the free calcium oxide on the surface of the waste steel ladle bricks has undergone high-pressure hot quenching and digestion treatment, the lower cover 74 can be opened independently, and the waste steel ladle bricks that have undergone high-pressure hot quenching and digestion treatment can be unloaded into the chain conveyor 8 through the hopper 9.

[0030] The above-mentioned hydraulic push rod 42, U-shaped push plate 43, and push rod 44 are configured so that the extension and retraction of the hydraulic push rod 42 can push the U-shaped push plate 43 and push rod 44 to move left and right, thereby enabling independent opening and closing control of the upper cover 73 and the lower cover 74.

[0031] like Figure 1 , 2 As shown in Figure 4, the high-pressure heat curing device 7 is fixedly installed at the corresponding position on the right side of the telescopic mechanism support 1. The high-pressure heat curing device 7 includes a support plate 71, which is fixedly installed at the middle position on both the front and rear sides of the high-pressure heat curing box 72. The high-pressure heat curing box 72 is a cuboid with openings at the top and bottom. The high-pressure heat curing box 72 uses waste heat to generate steam and performs high-pressure heat curing to dissolve the free calcium oxide on the surface of the waste steel ladle bricks. The high-pressure heat curing box 72 includes a V-shaped partition plate 721, which is installed inside the high-pressure heat curing box 72 near the right side. The bottom and top right sides of the V-shaped partition plate 721 are respectively fixed with a sealing plate 722. The right end of the sealing plate 722 is fixed to the right inner wall of the high-pressure heat curing box 72. The V-shaped partition plate 721 and the sealing plate 722 are integrally formed structures. The left side of the V-shaped partition plate 721 is the heat curing box 723, and the right side is the steam box 724. The steam box 724 uses the tunnel kiln preheating to heat water to generate steam.

[0032] The V-shaped partition plate 721 and the sealing plate 722 of the high-pressure hot blanching chamber 72 can be configured to separate the high-pressure hot blanching chamber 72 into a hot blanching chamber 723 and a steam chamber 724. On the one hand, the hot blanching chamber 723 is used to achieve high-pressure hot blanching of waste steel ladle bricks to dissolve the free calcium oxide on their surface. On the other hand, the steam chamber 724 is used to generate high-temperature steam, providing the necessary hot blanching conditions for the high-pressure hot blanching and dissolution treatment of waste steel ladle bricks.

[0033] The aforementioned support plate 71 and the strip-shaped heat dissipation holes 712 on both sides serve several purposes. Firstly, they provide fixed support for the high-pressure hot curing chamber 72. Secondly, when the waste steel ladle bricks are unloaded after the digestion process, there will be a certain amount of heat, which is dissipated and ventilated through the strip-shaped heat dissipation holes 712. Thirdly, they also reduce the weight of the support plate 71 itself.

[0034] like Figure 1 , 2 As shown in Figures 4 and 5, the upper cover 73 is slidably disposed on the upper part of the high-pressure hot curing chamber 72, and the lower cover 74 is slidably disposed on the bottom of the high-pressure hot curing chamber 72; the sliding body 75 is symmetrically fixedly disposed on the front and rear sides of the upper cover 73 and the lower cover 74; four protruding strips 76 are provided, two strips forming a group, one group is symmetrically disposed on the front and rear sides of the upper part of the high-pressure hot curing chamber 72, and the other group is fixedly disposed on the front and rear sides of the lower part of the high-pressure hot curing chamber 72; the protruding strips 76 are slidably fitted in the sliding body 75; the sliding body 75 includes a sliding body body 751, which is elongated; a sliding groove 752 is formed on the lower part of the inner side of the sliding body body 751 and extends through the sliding body body 751; the protruding strips 76 are slidably fitted in the sliding groove 752.

[0035] The above-mentioned sliding bodies 75 are symmetrically fixed on both sides of the upper cover 73 and the lower cover 74, and protrusions 76 are provided on the front and rear sides of the upper part and the front and rear sides of the lower part of the high-pressure hot curing chamber 72. Through the cooperation of the protrusions 76 and the sliding grooves 752 of the sliding bodies 75, on the one hand, under the pushing cooperation of the lower telescopic mechanism 5 or the upper telescopic mechanism 6, the sliding friction is reduced during the independent opening and closing of the upper cover 73 or the lower cover 74; on the other hand, it plays a role in firmly fixing the upper cover 73 and the lower cover 74, thereby improving the sealing effect of the upper cover 73 and the lower cover 74 on the high-pressure hot curing chamber 72.

[0036] like Figure 1 , 2As shown in Figure 4, the H-shaped steam pipe 77 passes through the upper part of the support plate 71 and is fixedly installed on the front and rear sides of the high-pressure hot braising box 72 near the left side. The steam pipe flange 78 is fixedly installed at the right end of the upper horizontal pipe of the H-shaped steam pipe 77. The H-shaped steam pipe 77 includes an H-shaped steam pipe body 771. Steam short pipes 772 are evenly arranged on the inner side of the upper and lower horizontal pipes of the H-shaped steam pipe body 771. The steam short pipes 772 are connected to the interior of the high-pressure hot braising box 72, and the steam short pipes 772 and the H-shaped steam pipe body 771 are in a connected state.

[0037] The above-mentioned steam short pipes 772 are evenly arranged inside the upper and lower transverse pipes of the H-shaped steam pipe body 771, and the steam short pipes 772 are connected to the interior of the high-pressure hot chamber 72. The main purpose of this arrangement is to use the steam short pipes 772 evenly arranged inside the upper and lower transverse pipes of the H-shaped steam pipe body 771 to simultaneously deliver high-temperature steam to the upper and lower parts of the hot chamber 723, and to improve the uniformity of high-temperature steam inside the hot chamber 723.

[0038] like Figure 1 , 2 As shown in Figure 5, the waste heat inlet pipe 79 is located at the lower right side of the high-pressure hot curing box 72, the steam exhaust pipe 710 is located at the upper part of the waste heat inlet pipe 79, and the water injection pipe 711 is fixedly located at the upper rear right side of the high-pressure hot curing box 72; the steam pipe flange 78 is connected to the output end of the booster pump 10 through a steam pipe, and the input end of the booster pump 10 is fixedly connected to the steam exhaust pipe 710; the waste heat inlet pipe 79 is connected to the waste heat outlet pipe of the tunnel kiln through a waste heat conveying pipeline, and the water injection pipe 711 is fixedly connected to the output port of the water injection pump through a water injection pipe.

[0039] The aforementioned waste heat introduction pipe 79 allows waste heat air from the tunnel kiln to be introduced into the steam box 724, providing a heating source for the water in the steam box 724. On the one hand, it heats the water in the steam box 724 to boiling point; on the other hand, it saves thermal energy and improves the multi-stage utilization of thermal energy.

[0040] The water injection pipe 711 is used to inject water into the steam box 724 via a water injection pump.

[0041] The aforementioned booster pump 10 is used to pressurize the high-temperature steam in the steam box 724 and deliver it to the hot braising box 723, ensuring sufficient pressure in the hot braising box 723.

[0042] like Figure 1 , 2As shown in Figure 6, a hopper 9 is fixedly installed on the upper part of the chain conveyor 8, and the chain conveyor 8 is fixedly installed at the bottom of the high-pressure hot curing box 72; the hopper 9 has a large upper opening and a small lower opening with an open right end, the lower opening of the hopper 9 is larger than the width of the chain plate of the chain conveyor 8, and the length of the hopper 9 is greater than the length of the high-pressure hot curing box 72.

[0043] The main purpose of the above-mentioned setup is to use the hopper 9 in conjunction with the chain conveyor 8 to prevent the waste steel ladle bricks from falling onto the front and rear sides of the chain conveyor 8 during the disintegration process. On the other hand, the waste steel ladle bricks can be transported to the crushing process to be crushed into refractory raw materials for waste steel ladle bricks, thereby realizing the utilization of waste steel ladle bricks.

[0044] like Figure 1 and 4 As shown, pressure sensor 11 is fixedly installed on the lower left side of the H-shaped steam pipe 77 on the front side of the high-pressure hot braising box 72; thermocouple 12 is fixedly installed on the left side of pressure sensor 11, and explosion-proof valve 13 is fixedly installed on the right side of pressure sensor 11; pressure sensor 11 is installed on the corresponding front side of hot braising box 723 near the left end, thermocouple 12 is installed on the left side of pressure sensor 11, and explosion-proof valve 13 is installed on the right side of pressure sensor 11; pressure sensor 11 and thermocouple 12 are used to monitor the pressure and temperature inside hot braising box 723 in real time; explosion-proof valve 13 prevents hot braising box 723 from exploding due to excessive steam pressure or gas pressure generated by the decomposition of free calcium oxide on the surface of waste steel ladle bricks.

[0045] The pressure sensor 11, as described above, allows for real-time monitoring of the steam pressure and temperature within the hot chamber 723. The thermocouple 12, on the other hand, allows for real-time monitoring of the temperature within the hot chamber 723.

[0046] The aforementioned pressure sensor 11, thermocouple 12, and explosion-proof valve 13 are connected to the PLC control module of the control system via signal transmission lines. The pressure of the hot chamber 723 is pre-set in the control system to be controlled within the range of 0.2 MPa to 0.4 MPa, and the temperature is controlled within the range of 160℃ to 200℃. The display screen of the control system can display the pressure and temperature values ​​in the hot chamber 723 in real time. When the pressure value in the hot chamber 723 exceeds the maximum threshold of 0.4 MPa, the PLC control module automatically controls the explosion-proof valve 13 to open and perform a pressure relief operation. When the pressure in the hot chamber 723 is less than 0.4 MPa, the explosion-proof valve 13 is in the closed state, thereby realizing the automatic linkage control between the pressure sensor 11, thermocouple 12, and explosion-proof valve 13.

[0047] like Figure 1-6As shown, the working principle of this utility model is as follows: Waste steel ladle bricks are transported to the hot-cooling chamber 723 of the high-pressure hot-cooling chamber 72 via a belt conveyor through a sealed container 72. High-temperature steam is generated by introducing waste heat from the tunnel kiln into a steam box 724. Then, a booster pump 10 pressurizes the steam in the steam box 724 and inputs it into the hot-cooling chamber 723. Under the process conditions of maintaining a pressure of 0.2 MPa to 0.4 MPa and a temperature of 160℃ to 200℃ in the hot-cooling chamber 723, the dense free calcium oxide on the surface of the waste steel ladle bricks undergoes high-pressure digestion treatment, converting the free calcium oxide on the surface of the waste steel ladle bricks into calcium hydroxide, thereby reducing the expansion rate of the refractory raw material of the waste steel ladle bricks.

[0048] like Figure 1-6As shown, the working process of this high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks is as follows: First, the operator starts the water injection pump and injects water into the steam box 724 of the high-pressure hot curing chamber 72 through the water injection pipe 711. When the water level in the steam box 724 reaches two-thirds, the water injection is stopped. At this time, the valve of the waste heat introduction pipe 79 is opened, and the medium and high temperature air waste heat from the tunnel kiln enters the steam box 724 through the waste heat introduction pipe 79, heating the water in the steam box 724 to boiling, generating high-temperature steam. Through the booster pump 10, the high-temperature steam is evenly input into the hot curing chamber 723 through the steam short pipe 722 of the H-shaped steam pipe, raising the temperature to 50~65℃. At this time, the operator starts the hydraulic push rod 42 of the upper telescopic mechanism 6 through the control switch of the upper telescopic mechanism 6. The telescopic rod of the hydraulic push rod 42 extends, pushing the U-shaped upper telescopic mechanism 6. Push plate 43 and push rod 44 move to the right. At this time, under the push of push rod 44, the upper cover 73 and the sliding groove 752 of the sliding body 75 on the front and rear sides are pushed to the right along the protrusion 76. When the telescopic rod of hydraulic push rod 42 is extended to its maximum limit, the left end of the upper cover 73 moves to the right edge of the hot braising box 723 of the high-pressure hot braising box 72. At this time, the waste steel ladle bricks are transported into the hot braising box 723 by the belt conveyor. After the waste steel ladle bricks in the hot braising box 723 reach three-quarters of the material level, the operator starts the hydraulic push rod 42 of the upper telescopic mechanism 6 again. The telescopic rod of hydraulic push rod 42 retracts, driving the U-shaped push plate 43 and push rod 44 to move to the left, and finally driving the upper cover 73 to slide to the left, closing the hot braising box 723. At this time, the waste steel ladle bricks in the hot braising box 723 are hot braising in high-temperature steam high pressure for one and a half to three hours. After the high-pressure heat treatment of waste steel ladle bricks is completed, the operator first starts the chain conveyor 8 to put it into operation. At this time, the operator repeats the same extension action as the upper telescopic mechanism 6 and controls the lower telescopic mechanism 5 to slide the lower cover 74. When the lower cover 74 moves to the right edge of the heat treatment chamber 723, the waste steel ladle bricks, after high-pressure heat treatment, fall onto the chain conveyor 8 through the hopper 9 by their own gravity. The chain conveyor 8 transports the waste steel ladle bricks that have undergone the digestion treatment to the next crushing process. The free calcium oxide on the surface of the waste steel ladle bricks hydrates to form calcium hydroxide, and the digestion of the free calcium oxide on the surface is as high as 95%.

[0049] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure hot-pressing device for dense free calcium oxide on the surface of waste steel ladle bricks, comprising a telescopic mechanism support, a base plate, and an upper plate. The telescopic mechanism support is a square structure, with a vertically mounted plate on the upper left side. The base plate is horizontally fixed at the bottom right side of the vertical plate of the telescopic mechanism support, and the upper plate is fixedly mounted on the upper part of the base plate. The telescopic mechanism is divided into a lower telescopic mechanism and an upper telescopic mechanism, with the lower telescopic mechanism fixedly mounted at the upper middle position of the base plate and the upper telescopic mechanism fixedly mounted at the upper middle position of the upper plate. Its features are: The high-pressure heat curing device is fixedly installed on the right side of the telescopic mechanism support. The device includes a support plate, which is fixedly installed in the middle of the front and rear sides of the high-pressure heat curing chamber. The chamber is a cuboid with openings at the top and bottom. It utilizes waste heat to generate steam and perform high-pressure heat curing to dissolve free calcium oxide on the surface of waste steel ladle bricks. The upper cover slides on the top of the chamber, and the lower cover slides on the bottom. Sliding bodies are symmetrically fixed on the front and rear sides of the upper and lower covers. Four convex strips are provided, in groups of two. One group is symmetrically positioned on the front and rear sides of the upper part of the chamber, and the other group is fixedly positioned on the front and rear sides of the lower part. The convex strips are slidably fitted into the sliding bodies. (H-type steam...) The steam pipe passes through the upper part of the support plate and is fixedly installed on both the front and rear sides of the high-pressure hot chamber near the left side. The steam pipe flange is fixedly installed at the right end of the upper horizontal pipe of the H-shaped steam pipe. The waste heat inlet pipe is located at the lower right side of the high-pressure hot chamber, and the steam outlet pipe is located above the waste heat inlet pipe. The water injection pipe is fixedly installed at the upper rear right side of the high-pressure hot chamber. A hopper is fixedly installed on the upper part of the chain conveyor, and the chain conveyor is fixedly installed at the bottom of the high-pressure hot chamber. The booster pump is longitudinally fixed at the bottom left side of the telescopic mechanism support. The pressure sensor is fixedly installed on the lower left side of the front H-shaped steam pipe of the high-pressure hot chamber. The thermocouple is fixedly installed to the left of the pressure sensor, and the explosion-proof valve is fixedly installed to the right of the pressure sensor.

2. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The telescopic mechanism includes support blocks, which are symmetrically arranged on the upper middle part of the base plate or the upper plate. A hydraulic push rod is fixedly arranged on the symmetrically arranged support blocks. A U-shaped push plate is fixedly arranged on the right end of the telescopic rod of the hydraulic push rod, and the longitudinal center of the U-shaped push plate is fixed to the right end of the telescopic rod of the hydraulic push rod. The push rod is symmetrically arranged on both sides of the U-shaped push plate. The hydraulic push rod is fixedly connected to the pump valve of the hydraulic station.

3. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The support plate includes a support plate body, which is L-shaped. Strip-shaped heat dissipation holes are evenly opened on the side of the support plate body to dissipate the heat generated by the free calcium oxide on the surface of the waste steel ladle bricks under high pressure heat treatment.

4. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The high-pressure hot braising chamber includes a V-shaped partition plate, which is located inside the high-pressure hot braising chamber near the right side. A sealing plate is fixedly installed on the bottom and top right side of the V-shaped partition plate, and the right end of the sealing plate is fixed to the right inner wall of the high-pressure hot braising chamber. The V-shaped partition plate and the sealing plate are integrally formed. The left side of the V-shaped partition plate is the hot braising chamber, and the right side is the steam chamber. The steam chamber uses the tunnel kiln preheating to heat water to form steam.

5. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The slider includes a slider body, which is elongated. A sliding groove is formed on the lower inner side of the slider body and extends through the slider body. A convex strip is slidably fitted in the sliding groove.

6. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 2, characterized in that: The right end of the push rod is positioned above or below the sliding body, and the push rod and the sliding body are arranged horizontally from left to right.

7. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The H-type steam pipe includes an H-type steam pipe body. Short steam pipes are evenly arranged on the inner side of the upper and lower horizontal pipes of the H-type steam pipe body. The short steam pipes are connected to the interior of the high-pressure hot curing box, and the short steam pipes are connected to the H-type steam pipe body.

8. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The steam pipe flange is connected to the output end of the booster pump via a steam pipe, and the input end of the booster pump is fixedly connected to the steam discharge pipe; the waste heat inlet pipe is connected to the waste heat outlet pipe of the tunnel kiln via a waste heat conveying pipeline, and the water injection pipe is fixedly connected to the output port of the water injection pump via a water injection pipe.

9. The high-pressure hot curing device for dense free calcium oxide on the surface of waste steel ladle bricks according to claim 1, characterized in that: The hopper has a large top opening, a small bottom opening, and an opening at the right end. The bottom opening of the hopper is larger than the width of the chain conveyor chain, and the length of the hopper is greater than the length of the high-pressure hot curing chamber.

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