Suspension carbonization device for steel slag micropowder

Abstract

The utility model relates to the technical field of steel slag carbonization, and discloses a suspension carbonization device for steel slag micro powder, which comprises a carbonization reaction chamber, a first screen, an air supply pipe, a first exhaust pipe and a collecting device, a first opening and closing valve is arranged on the first exhaust pipe; the collecting device is connected with the discharging port through an air entraining guide pipe, and a second opening and closing valve is arranged on the air entraining guide pipe. According to the utility model, CO2-containing gas is provided into the carbonization reaction chamber by using the gas supply pipe, powder reacting with CO2 is provided into the carbonization reaction chamber through the feed port, and the powder is suspended in the carbonization reaction chamber and carbonized, so that the required carbonization reaction time can be greatly reduced. In addition, online switching of the carbonization process and the finished product collecting process can be achieved by controlling opening and closing of a first opening and closing valve and a second opening and closing valve, continuous carbonization is achieved, large-scale preparation of carbonized micro powder is greatly promoted, and rapid high-value utilization of steel slag resources is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steel slag carbonization discloses a kind of suspension carbonization device for steel slag micro powder. BACKGROUND

[0002] Steel slag is alkaline solid waste generated in the process of steelmaking, and 0.1-0.15 tons of steel slag and 1.85 tons of CO2 are generated per ton of crude steel produced. The abandoned storage of steel slag can cause serious pollution to the atmosphere, water resources and soil, destroy the surrounding ecological environment and occupy a large amount of land resources. In addition, the steel industry accounts for 6%-8% of global CO2 emissions. Therefore, the comprehensive utilization of steel slag and CO2 emission reduction in the steel industry need to be improved.

[0003] The main mineral phase composition of steel slag is C3S, C2S, C4AF, RO phase, C2F and a small amount of f-CaO, f-MgO, etc. The total content of C3S and C2S in steel slag can reach more than 50%, in addition, a small amount of C4AF and C2F, similar to Portland cement clinker in cementitious phase component types, but the content of silicate and activity in steel slag are lower than that of cement clinker, and the content of iron and phosphorus is relatively high. Therefore, steel slag can be regarded as a kind of inferior Portland cement clinker. The content of f-CaO and f-MgO in steel slag is relatively high, and steel slag-based cementitious materials usually show poor volume stability, weak early hydration activity and low mechanical strength, which greatly limits the application of steel slag in building materials.

[0004] Carbonation curing can stabilize the active ingredients of steel slag and capture CO2, thereby effectively improving the volume stability and strength of steel slag-based cementitious materials, and is expected to become an ideal strategy for consuming a large amount of steel slag and reducing carbon emissions in the steel industry. Steel slag carbonization is currently mainly solid-state carbonization and liquid-state carbonization, however, the liquid-state carbonization process is complex and easy to produce water pollution; the solid-state carbonization is limited by carbonation degree and test block size, the existing solid-state carbonization method has long processing time and low carbonation rate, and cannot consume f-CaO and f-MgO and other expansion components in a short time. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of suspension carbonization device for steel slag micro powder, can increase the contact area and probability of steel slag powder and CO2 gas in unit time, can greatly reduce the time required for carbonation reaction;It can also realize online switching of carbonation process and finished product collection process, realize continuous carbonization.

[0006] In order to realize the above technical effects, the utility model adopts the technical scheme of:

[0007] A kind of suspension carbonization device for steel slag micro powder, comprising:

[0008] A carbonization reaction chamber, wherein a feeding port is arranged on the carbonization reaction chamber, and a discharging port is arranged at an upper position in the carbonization reaction chamber, and the feeding port is arranged between the discharging port and a bottom of the carbonization reaction chamber;

[0009] A first screen is arranged at a position above the discharging port, and the first screen divides the carbonization reaction chamber into an upper chamber and a lower chamber;

[0010] A gas supply pipe is in communication with an inner cavity of the carbonization reaction chamber, and a gas outlet of the gas supply pipe is arranged below the feeding port, and a gas outlet direction of the gas supply pipe is towards a top of the carbonization reaction chamber;

[0011] A first exhaust pipe is arranged at a top or a sidewall of the upper chamber corresponding to the carbonization reaction chamber, and a first on-off valve is arranged on the first exhaust pipe;

[0012] A collecting device is connected with the discharging port through an air guide pipe, and is used for collecting particulate materials discharged from the discharging port, and a second on-off valve is arranged on the air guide pipe.

[0013] Further, a material guide pipe is arranged for connecting a powder bin with the feeding port, and a water guide pipe is arranged in communication with an inner cavity of the material guide pipe.

[0014] Further, a gas outlet end of the first exhaust pipe is in communication with the gas supply pipe.

[0015] Further, the collecting device is a cyclone separator, and the cyclone separator comprises a cyclone separation cylinder and a material collecting barrel arranged at a bottom of the cyclone separation cylinder, and a gas inlet pipe and a second exhaust pipe are arranged on the cyclone separation cylinder, and the gas inlet pipe of the cyclone separator is in communication with the air guide pipe.

[0016] Further, a gas outlet end of the second exhaust pipe is in communication with the gas supply pipe.

[0017] Further, a second screen is arranged in the lower chamber, and the second screen is arranged at a position close to the gas outlet of the gas supply pipe, and the feeding port and the discharging port are both arranged between the first screen and the second screen.

[0018] Further, a heater is arranged on the gas supply pipe, and is used for heating a gas flow input into the carbonization reaction chamber.

[0019] Further, a gas storage bottle is arranged in communication with the gas supply pipe, and a fan is arranged on the gas supply pipe, and is used for driving a gas flow.

[0020] Further, a flow meter is arranged on the gas supply pipe, and is used for measuring a gas supply flow.

[0021] Further, the gas supply pipe is also provided with a sensor assembly, which includes one or more of a temperature sensor, a humidity sensor and a sensor for detecting the concentration of effective components entering the carbonization reaction chamber.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. The present application provides CO2-containing gas to the carbonization reaction chamber through the gas supply pipe, and provides powder that reacts with CO2 to the carbonization reaction chamber through the feed inlet, so that the powder is suspended in the carbonization reaction chamber and carbonized; the contact area and probability of the steel slag powder and CO2 gas per unit time are increased, the transmission efficiency of CO2 between steel slag powder particles is improved, the carbonization of steel slag powder is more uniform, and the time required for carbonization reaction can be greatly reduced while reducing the expansion value of steel slag powder and improving the activity index.

[0024] 2. The present application can realize online switching of the carbonization process and the finished product collection process by controlling the opening and closing of the first on-off valve and the second on-off valve, realize continuous carbonization, greatly promote the large-scale preparation of carbonized powder, and realize the rapid and high-value utilization of steel slag resources. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the suspension carbonization device for steel slag powder in the embodiment is shown in the figure.

[0026] 1. carbonization reaction chamber; 2. first screen; 3. gas supply pipe; 4. first exhaust pipe; 5. first on-off valve; 6. air guide pipe; 7. second on-off valve; 8. powder bin; 9. water guide pipe; 10. cyclone separation cylinder; 11. material collecting bucket; 12. air inlet pipe; 13. second exhaust pipe; 14. second screen; 15. heater; 16. gas cylinder; 17. fan; 18. flow meter; 19. sensor assembly. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in conjunction with the embodiments and the drawings. However, it should not be understood that the scope of the above-mentioned subject matter of the present application is limited to the following embodiments, and any technology realized based on the content of the present application belongs to the scope of the present application.

[0028] EMBODIMENT

[0029] Referring to Figure 1 , a suspension carbonization device for steel slag powder, comprising:

[0030] A carbonization reaction chamber 1 is provided with a feeding port and a discharging port, the discharging port is located at an upper position in the carbonization reaction chamber 1, and the feeding port is located between the discharging port and the bottom of the carbonization reaction chamber 1;

[0031] A first screen 2 is located above the discharging port, and the first screen 2 divides the carbonization reaction chamber 1 into an upper chamber and a lower chamber;

[0032] A gas supply pipe 3 is in communication with the inner cavity of the carbonization reaction chamber 1, the gas outlet of the gas supply pipe 3 is located below the feeding port, and the gas outlet direction of the gas supply pipe 3 is towards the top of the carbonization reaction chamber 1;

[0033] A first exhaust pipe 4 is provided at the top or side wall of the carbonization reaction chamber 1 corresponding to the upper chamber, and the first exhaust pipe 4 is provided with a first on-off valve 5;

[0034] A collecting device is connected with the discharging port through an air guide pipe 6, and is used for collecting the particulate material discharged from the discharging port, and the air guide pipe 6 is provided with a second on-off valve 7.

[0035] In the embodiment, the gas supply pipe 3 provides CO2-containing gas into the carbonization reaction chamber 1, the feeding port is used to provide powder material reacting with CO2 into the carbonization reaction chamber 1, and carbonization of the powder material is realized in the carbonization reaction chamber 1. The embodiment is specifically described by taking the reaction of steel slag and CO2 as an example:

[0036] During the carbonization reaction, the first on-off valve 5 is opened, and the second on-off valve 7 is closed. After the steel slag is input into the carbonization reaction chamber 1 from the feeding port, the gas flow input into the carbonization reaction chamber 1 by the gas supply pipe 3 blows up the steel slag, and the first screen 2 can avoid the problem that the powder material enters the first exhaust pipe 4 and causes pipe blockage. The steel slag forms a suspended state in the carbonization reaction chamber 1, and the free calcium oxide (f-CaO) or free magnesium oxide (f-MgO) in the steel slag contacts CO2 in the CO2-containing gas flow and completes the carbonization reaction. This process adopts a suspended state carbonization mode, increases the contact area and probability of the steel slag powder and CO2 gas per unit time, improves the transmission efficiency of CO2 between the steel slag powder particles, ensures more uniform carbonization of the steel slag powder, and can greatly reduce the required carbonization reaction time while reducing the expansion value of the steel slag powder and improving the activity index. In addition, after a part of the steel slag powder is carbonized, the second on-off valve 7 is opened, the first on-off valve 5 is closed, and the gas-solid mixture after carbonization can be blown into the collecting device from the discharging port under the continuous working state of the gas supply pipe 3, so as to realize the collection of the carbonized steel slag. After the collection is completed, the first on-off valve 5 can be opened again, and the second on-off valve 7 can be closed, so as to realize continuous carbonization, greatly promote the large-scale preparation of carbonized powder, and realize the rapid and high-value utilization of steel slag resources.

[0037] The suspension carbonization device in the embodiment further comprises a material guide pipe for connecting the powder bin 8 and the feeding port, and a water guide pipe 9 is arranged on the material guide pipe and communicates with the inner cavity of the material guide pipe; in the process of providing the steel slag powder to the carbonization reaction chamber 1 by using the material guide pipe, water is introduced into the material guide pipe by using the water guide pipe 9 to pre-wet the steel slag powder in the material guide pipe, so that a layer of water film is attached to the steel slag powder, and the calcium and magnesium ions can be dissolved in the water film environment, which is beneficial to further improving the carbonization reaction of the calcium and magnesium ions.

[0038] In the embodiment, the gas outlet end of the first exhaust pipe 4 communicates with the gas supply pipe 3, which not only avoids the environmental pollution caused by the direct discharge of CO2 gas, but also realizes the recycling of the CO2-containing gas flow in the carbonization process.

[0039] The collection device in the embodiment is a cyclone separator, which comprises a cyclone separation cylinder 10 and a material collecting barrel 11 located at the bottom of the cyclone separation cylinder 10, and an air inlet pipe 12 and a second exhaust pipe 13 are arranged on the cyclone separation cylinder 10, and the air inlet pipe 12 of the cyclone separator communicates with the air guide pipe 6. After the carbonization of one feeding is completed, the gas flow in the gas supply pipe 3 introduces the carbonized powder into the air inlet pipe 12 of the cyclone separator from the air guide pipe 6, and then the gas flow is introduced into the cyclone separation cylinder 10 along the tangential direction of the side wall of the straight cylinder segment of the cyclone separation cylinder 10 by the air inlet pipe 12 of the cyclone separator. The gas flow containing the carbonized steel slag powder realizes gas-solid separation in the cyclone separation cylinder 10, the gas material is discharged from the second exhaust pipe 13, and the solid material enters the material collecting barrel 11 at the bottom to realize the collection of the carbonized steel slag powder.

[0040] In the embodiment, the gas outlet end of the second exhaust pipe 13 communicates with the gas supply pipe 3 during the powder collection by using the cyclone separator, which not only avoids the environmental pollution caused by the direct discharge of CO2 gas, but also realizes the recycling of the CO2-containing gas flow in the carbonization process.

[0041] In the embodiment, a second screen 14 is arranged in the lower chamber, the second screen 14 is located close to the gas outlet of the gas supply pipe 3, and the feeding port and the discharging port are both located between the first screen 2 and the second screen 14, which can avoid the problem that the powder material enters the gas supply pipe 3 from the gas outlet of the gas supply pipe 3 during the suspension carbonization process and the powder collection process, causing pipe blockage.

[0042] In the embodiment, a heater 15 is arranged on the gas supply pipe 3, which can be used to heat the gas flow input into the carbonization reaction chamber 1, so as to increase the reaction temperature in the carbonization reaction chamber 1 and further improve the carbonization reaction rate.

[0043] In the embodiment, the gas supply pipe 3 is communicated with a gas cylinder 16, the gas cylinder 16 can store CO2 gas, and the gas cylinder 16 can drive the gas supply by the internal gas pressure; however, in order to realize the stable supply of CO2 gas, the embodiment drives the gas flow by the fan 17 arranged on the gas supply pipe 3, and provides the gas containing CO2 into the carbonization reaction chamber 1.

[0044] In the embodiment, the gas supply pipe 3 is further arranged with a flow meter 18 (for example, a hole plate type flow meter 18 is selected in the embodiment) for measuring the gas supply flow and a sensor assembly 19, such as a temperature sensor, a humidity sensor and a sensor for detecting the effective component concentration entering the carbonization reaction chamber 1, so as to realize the accurate measurement of the gas flow, temperature, humidity and CO2 concentration of the gas flow, and realize the accurate adjustment and control of the gas flow, temperature, humidity and CO2 concentration based on the measurement data.

[0045] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A suspension carbonization device for steel slag micro-powder, characterized in that, The application relates to a carbonization reaction chamber, which comprises the following components: a carbonization reaction chamber (1) provided with a feeding port and a discharging port, wherein the discharging port is located at an upper position in the carbonization reaction chamber (1), and the feeding port is located between the discharging port and the bottom of the carbonization reaction chamber (1); a first screen (2) located above the discharging port, which divides the carbonization reaction chamber (1) into an upper chamber and a lower chamber; a gas supply pipe (3) in communication with the inner cavity of the carbonization reaction chamber (1), wherein the gas outlet of the gas supply pipe (3) is located below the feeding port, and the gas outlet direction of the gas supply pipe (3) is towards the top of the carbonization reaction chamber (1); a first exhaust pipe (4) arranged at the top or sidewall of the upper chamber corresponding to the carbonization reaction chamber (1), wherein the first exhaust pipe (4) is provided with a first on-off valve (5); a collecting device connected with the discharging port through an air guide pipe (6) for collecting the granular materials discharged from the discharging port, wherein the air guide pipe (6) is provided with a second on-off valve (7); 2. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein a material guide pipe for connecting a powder bin (8) with the feeding port, wherein the material guide pipe is further provided with a water guide pipe (9) in communication with the inner cavity of the material guide pipe.

3. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein The gas outlet end of the first exhaust pipe (4) is in communication with the gas supply pipe (3).

4. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein The collecting device is a cyclone separator, which comprises a cyclone separation cylinder (10) and a material collecting barrel (11) located at the bottom of the cyclone separation cylinder (10), wherein the cyclone separation cylinder (10) is provided with a gas inlet pipe (12) and a second exhaust pipe (13); the gas inlet pipe (12) of the cyclone separator is in communication with the air guide pipe (6).

5. The apparatus for suspending and carbonizing steel slag fines according to claim 4, wherein The gas outlet end of the second exhaust pipe (13) is in communication with the gas supply pipe (3).

6. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein A second screen (14) is arranged in the lower chamber, which is located close to the gas outlet of the gas supply pipe (3), and the feeding port and the discharging port are both located between the first screen (2) and the second screen (14).

7. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein A heater (15) is arranged on the gas supply pipe (3) for heating the gas flow input into the carbonization reaction chamber (1).

8. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein A gas storage cylinder (16) is further arranged, which is in communication with the gas supply pipe (3), and a fan (17) for driving the gas flow is arranged on the gas supply pipe (3).

9. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein A flow meter (18) for measuring the gas supply flow is further arranged on the gas supply pipe (3).

10. The apparatus for suspending and carbonizing steel slag fines according to claim 1, wherein A sensor assembly (19) is further arranged on the gas supply pipe (3), which comprises one or more of a temperature sensor, a humidity sensor and a sensor for detecting the concentration of effective components entering the carbonization reaction chamber (1).

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