Temporary slag disintegrating method for converter steel slag

Abstract

The invention relates to the technical field of steel slag treatment, in particular to a converter steel slag temporary stuffy slag method which comprises the following steps: step 1, slag overturning: overturning converter steel slag into a hot stuffy pool; step 2, stirring the converter steel slag in the hot stuffy pool by using a mechanical device, and carrying out cooling treatment; (3) deslagging: feeding the converter steel slag obtained in the step (2) into a temporary slag disintegrating device; and 4, slag disintegration is conducted, specifically, the temporary slag disintegration device filled with the converter steel slag is transported to a water fetching and gas collecting integrated device. According to the method, the production rhythm can be maintained, and the temporary slag disintegration method can ensure that the converter steel slag treatment process is not interrupted under the condition that the hot disintegration pool is overhauled or breaks down, so that the overall production rhythm of a steel mill is maintained, the situation that the converter is forced to stop production or reduce production due to related problems of the hot disintegration pool is avoided, the converter can continuously discharge slag, and the production efficiency is improved. And the steel slag can be treated in time, so that the continuity of steel production is ensured, and huge economic loss caused by production stagnation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel slag treatment, in particular to a temporary slagging method for converter steel slag. Background Art

[0002] The third generation pool hot stuffing treatment process for converter slag has been widely used in major domestic steel mills due to its advantages of small footprint and fast online processing speed. In the third generation pool hot stuffing treatment process for converter slag, the hot stuffing pool, as the core process equipment, has an important impact on the efficiency and safety of converter slag treatment.

[0003] Most hot stuffy pools are underground structures, surrounded by reinforced concrete and inlaid with steel billets. To reduce the impact of high temperature on the concrete layer, refractory materials are poured between the concrete and the steel billets. The working environment of hot stuffy pools is harsh, and they are affected by adverse factors such as high temperature and mechanical collision for a long time. As the service time of hot stuffy pools increases, they mainly have the following three problems: First, under the long-term action of thermal stress and mechanical force, the steel billets in the hot stuffy pools are severely deformed; second, the refractory layer of the hot stuffy pools falls off and the concrete layer is prone to cracking. At present, most hot stuffy pools in domestic steel mills are arranged in a straight line. During the slag-sucking process in one hot stuffy pool, water seepage is prone to occur in adjacent hot stuffy pools, and slag-turning and blasting accidents are prone to occur; third, due to its special structure, the hot stuffy pool is difficult to repair and has a long maintenance cycle.

[0004] At present, the production pace of steel mills is fast. If the hot stuffing pool cannot be repaired in time, it will inevitably affect the processing efficiency and safety of the converter slag, and then affect the production rhythm of the converter. In the third-generation pool-type hot stuffing treatment process for converter slag, the entire process time is 24 hours, of which the slag stuffing time is about 12 hours. If the hot stuffing pool is shut down due to maintenance, the turnover rate of the remaining hot stuffing pools must be improved, and the slag stuffing time must be greatly compressed, but it will seriously affect the slag stuffing quality of the converter slag. Therefore, under the premise of ensuring the quality of the slag stuffing, during the maintenance of the hot stuffing pool, it is possible to consider canceling the remaining hot stuffing pool slag stuffing processes and find a temporary, efficient and environmentally friendly slag stuffing process to fundamentally solve the problem. Summary of the invention

[0005] The object of the present invention is to provide a method for temporarily slagging converter slag, which can solve the above technical problems.

[0006] The present invention provides a method for temporarily smoldering converter slag, comprising the following steps:

[0007] Step 1: Turn over the slag: turn over the converter slag into the hot pond;

[0008] Step 2: using a mechanical device to stir the converter slag in the hot pool and perform a cooling treatment;

[0009] Step 3, slag discharge: sending the converter slag obtained in step 2 to a temporary slag suffocating device;

[0010] Step 4, slag-smothering: transport the temporary slag-smothering device loaded with converter slag to the integrated water-pumping and gas-collecting device.

[0011] Principle of water cooling: Spray water on the surface of slag, the water will vaporize rapidly under the action of high temperature slag, absorb a large amount of heat, and thus reduce the temperature of slag. The water vapor generated by water vaporization mixes with the gas generated by the reaction of slag.

[0012] Gas collection principle: Chemical reactions will occur during the cooling process of steel slag, producing some gases, such as hydrogen and carbon monoxide. These gases gather at the top of the tank and are collected by the gas collection hood into the gas collection pipeline. The gas collection system will transport the collected gas to the subsequent gas processing equipment for corresponding treatment to meet environmental protection requirements or achieve resource recycling.

[0013] Preferably, the mechanical device in step 2 is an excavator.

[0014] Preferably, the temperature reduction treatment in step 2 adopts natural cooling.

[0015] Preferably, in step 2, a mist cannon is used to spray water for cooling.

[0016] Preferably, the effective coverage area of ​​the water mist of the fog cannon is 20-30m 2 The lift distance of the fog cannon is 5-8m.

[0017] Preferably, the temporary slag sealing device is a waste slag pot, and a plurality of circular drainage holes are provided at the bottom of the waste slag pot.

[0018] Preferably, the number of the circular drainage holes is 6-10, and the diameter is 10-30 mm.

[0019] Preferably, in step 3, the slag loading amount of the temporary slag sealing device is more than 10 cm away from the upper position of the temporary slag sealing device.

[0020] Preferably, the integrated water pumping and gas collecting device includes a flip cover. The flip cover adopts a double-layer structure. The outer layer is a high-temperature resistant and corrosion-resistant metal shell, such as stainless steel, which can withstand the heat generated by high-temperature steel slag and possible chemical corrosion. The inner layer is a heat-insulating material layer, and ceramic fiber felt, etc. can be selected. It has good thermal insulation performance and can effectively reduce the transfer of heat to the external environment, reduce energy consumption, and protect the external metal structure. A sealing rubber ring is set on the edge of the flip cover, and the rubber ring has good high-temperature resistance and chemical resistance. When the lid is closed, the sealing rubber ring fits tightly with the edge of the tank body of the water pumping and gas collecting device to form a reliable seal to prevent gas leakage during the water pumping and gas collecting process, thereby ensuring gas collection efficiency and environmental protection effects.

[0021] Preferably, it also includes a spraying device and an air collecting device, and the air collecting device is connected to the wet electrostatic precipitator.

[0022] The spray device is installed under the flip cover, and is evenly distributed according to the size of the flip cover coverage area and the distribution of slag. The spray head can be made of ceramic or stainless steel that is wear-resistant, high-temperature resistant and has good atomization effect. The spray angle and flow rate of each spray head can be adjusted according to actual needs to ensure that the water can evenly cover the surface of the slag and achieve an efficient cooling effect.

[0023] The gas collecting hood of the gas collecting device is located at the top center or appropriate position of the flip cover, and its shape matches the slag processing area below. The gas collecting hood adopts a concave design, which is conducive to the gathering of gas. The edge of the gas collecting hood is sealed with the flip cover to prevent gas leakage from the edge. Its material is made of lightweight and high-temperature resistant fiberglass or stainless steel plate to reduce the impact of weight on the flip operation of the flip cover, while ensuring stability in high temperature environment. The gas transmission pipeline leading out of the gas collecting hood is seamlessly connected to the gas collecting hood, and the inside of the pipeline is smooth to reduce the gas flow resistance. Flow regulating valves and pressure sensors can be set on the pipeline to control the flow of gas and monitor the pressure in the pipeline. If necessary, the pipeline can adopt insulation measures to prevent the temperature of the gas from dropping too fast during the transportation process, causing condensation of certain components.

[0024] The gas collecting device is connected to the wet electrostatic precipitator through a pipeline. The connection part adopts flange connection and uses high temperature and corrosion resistant sealing materials, such as graphite gaskets, to ensure the sealing of the connection. The diameter and length of the pipeline are reasonably designed according to the gas flow rate and transportation distance to ensure that the gas can smoothly enter the wet electrostatic precipitator.

[0025] When slag produces gas during the treatment process, the gas is collected by the gas hood and transported to the wet electrostatic precipitator through a pipeline. In the wet electrostatic precipitator, impurities such as dust and smoke in the gas are adsorbed and removed under the action of the electric field to purify the gas. The purified gas can be discharged or further processed according to the requirements of subsequent processes, thereby effectively reducing the pollution to the environment caused by the slag treatment process.

[0026] Beneficial effects:

[0027] The present invention can maintain the production rhythm. In the case of hot stuffy pool maintenance or failure, the temporary slag method can ensure that the converter slag processing process is not interrupted, which enables the overall production rhythm of the steel plant to be maintained, and the converter will not be forced to stop production or reduce production due to hot stuffy pool related problems. The converter can continue to slag, and the slag can be processed in time, ensuring the continuity of steel production, reducing the huge economic losses caused by production stagnation, and improving equipment utilization. Due to the temporary slag method as a supplement, core processing equipment such as hot stuffy pools can be carried out as planned when they need repair or maintenance, without excessively compressing the maintenance time or delaying the maintenance in order not to affect production, thereby improving the service life and long-term operation efficiency of these equipment. At the same time, the converter can also make more full use of its effective operating time and improve the overall utilization of the equipment. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] A method for temporarily suffocating converter slag comprises the following steps:

[0033] Step 1: Turn over the slag: turn over the converter slag into the hot pond;

[0034] Step 2: Use an excavator to stir the converter slag in the hot pool, and use a fog cannon to spray water to cool it down. The effective coverage area of ​​the fog cannon’s water mist is 20-30m 2 , the lift distance of the fog cannon is 5-8m;

[0035] Step 3, slag discharge: the converter slag obtained in step 2 is fed into a temporary slag suffocating device, and the slag loading of the temporary slag suffocating device is more than 10 cm above the upper part of the temporary slag suffocating device. The temporary slag suffocating device is a waste slag pot, and a plurality of circular drainage holes are provided at the bottom of the waste slag pot, and the number of the circular drainage holes is 6-10, and the diameter is 10-30 mm;

[0036] Step 4, slag-smothering: transport the temporary slag-smothering device loaded with converter slag to the integrated water-pumping and gas-collecting device.

[0037] Principle of water cooling: Spray water on the surface of slag, the water will vaporize rapidly under the action of high temperature slag, absorb a large amount of heat, and thus reduce the temperature of slag. The water vapor generated by water vaporization mixes with the gas generated by the reaction of slag.

[0038] Gas collection principle: Chemical reactions will occur during the cooling process of steel slag, producing some gases, such as hydrogen and carbon monoxide. These gases gather at the top of the tank and are collected by the gas collection hood into the gas collection pipeline. The gas collection system will transport the collected gas to the subsequent gas processing equipment for corresponding treatment to meet environmental protection requirements or achieve resource recycling.

[0039] The integrated water pumping and gas collecting device includes a flip cover. The flip cover adopts a double-layer structure. The outer layer is a high-temperature resistant and corrosion-resistant metal shell, such as stainless steel, which can withstand the heat generated by high-temperature steel slag and possible chemical corrosion. The inner layer is a heat-insulating material layer, and ceramic fiber felt, etc. can be selected. It has good heat insulation performance and can effectively reduce the transfer of heat to the external environment, reduce energy consumption, and protect the external metal structure. A sealing rubber ring is set on the edge of the flip cover, and the rubber ring has good high-temperature resistance and chemical resistance. When the lid is closed, the sealing rubber ring fits tightly with the edge of the tank body of the water pumping and gas collecting device to form a reliable seal to prevent gas leakage during the water pumping and gas collecting process, thereby ensuring gas collection efficiency and environmental protection effects.

[0040] It also includes a spray device and a gas collection device, and the gas collection device is connected to the wet electrostatic precipitator to ensure that the dust-containing steam meets the ultra-low emission standard after treatment.

[0041] The spray device is installed under the flip cover, and is evenly distributed according to the size of the flip cover coverage area and the distribution of slag. The spray head can be made of ceramic or stainless steel that is wear-resistant, high-temperature resistant and has good atomization effect. The spray angle and flow rate of each spray head can be adjusted according to actual needs to ensure that the water can evenly cover the surface of the slag and achieve an efficient cooling effect.

[0042] The gas collecting hood of the gas collecting device is located at the top center or appropriate position of the flip cover, and its shape matches the slag processing area below. The gas collecting hood adopts a concave design, which is conducive to the gathering of gas. The edge of the gas collecting hood is sealed with the flip cover to prevent gas leakage from the edge. Its material is made of lightweight and high-temperature resistant fiberglass or stainless steel plate to reduce the impact of weight on the flip operation of the flip cover, while ensuring stability in high temperature environment. The gas transmission pipeline leading out of the gas collecting hood is seamlessly connected to the gas collecting hood, and the inside of the pipeline is smooth to reduce the gas flow resistance. Flow regulating valves and pressure sensors can be set on the pipeline to control the flow of gas and monitor the pressure in the pipeline. If necessary, the pipeline can adopt insulation measures to prevent the temperature of the gas from dropping too fast during the transportation process, causing condensation of certain components.

[0043] The gas collecting device is connected to the wet electrostatic precipitator through a pipeline. The connection part adopts flange connection and uses high temperature and corrosion resistant sealing materials, such as graphite gaskets, to ensure the sealing of the connection. The diameter and length of the pipeline are reasonably designed according to the gas flow rate and transportation distance to ensure that the gas can smoothly enter the wet electrostatic precipitator.

[0044] When slag produces gas during the treatment process, the gas is collected by the gas hood and transported to the wet electrostatic precipitator through a pipeline. In the wet electrostatic precipitator, impurities such as dust and smoke in the gas are adsorbed and removed under the action of the electric field to purify the gas. The purified gas can be discharged or further processed according to the requirements of subsequent processes, thereby effectively reducing the pollution to the environment caused by the slag treatment process.

[0045] The flipping of the flip cover is driven by an electric push rod or a hydraulic push rod. The push rod is connected to the flip cover through a hinge, and its movement is precisely controlled by the control system. The control system can accurately control the opening and closing angles of the flip cover according to the work process of pumping water and collecting gas and the feedback information from the sensor to achieve automatic operation. A high-precision angle sensor is installed at the rotating shaft of the flip cover to provide real-time feedback on the flip angle information of the cover. The angle sensor is connected to the control system to ensure that the cover can accurately reach the appropriate angle when opened, which is convenient for the entry and exit of the waste slag tank and the pumping of water, and can be completely sealed when closed.

[0046] When the waste slag tank is transported to the integrated water pumping and gas collection station, the flip cover opens automatically, and the opening angle can be set to 70-90 degrees according to the height of the waste slag tank and the operating space requirements. During the water pumping process, the flip cover remains open, and a protective cover can be set above it to prevent water from splashing to the external environment during water pumping. When the water pumping is completed, the flip cover slowly closes and the gas collection system is started at the same time. The gas collection pipeline is connected to the gas collection chamber inside the flip cover. After the lid is closed, the gas collection chamber is connected to the internal space of the waste slag tank, and the gas generated by the continued reaction of the steel slag is collected through the gas collection chamber to the subsequent gas treatment device.

[0047] Matters not covered in the present invention are applicable to the prior art.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for temporarily smoldering converter slag, characterized in that: The following steps are involved: Step 1: Turn over the slag: turn over the converter slag into the hot pond; Step 2: using a mechanical device to stir the converter slag in the hot pool and perform a cooling treatment; Step 3, slag discharge: sending the converter slag obtained in step 2 to a temporary slag suffocating device; Step 4, slag-smothering: transport the temporary slag-smothering device loaded with converter slag to the integrated water-pumping and gas-collecting device.

2. The method for temporarily smoldering converter slag according to claim 1, characterized in that: The mechanical device in step 2 is an excavator.

3. The method for temporarily smoldering converter slag according to claim 1, characterized in that: The temperature reduction treatment in step 2 adopts natural cooling.

4. The method for temporarily smoldering converter slag according to claim 1, characterized in that: In step 2, a mist cannon is used to spray water for cooling.

5. The method for temporarily smoldering converter slag according to claim 4, characterized in that: The effective coverage area of ​​the water mist of the fog cannon is 20-30m 2 The lift distance of the fog cannon is 5-8m.

6. The method for temporarily smoldering converter slag according to claim 1, characterized in that: The temporary slag sealing device is a waste slag tank, and a plurality of circular drainage holes are arranged at the bottom of the waste slag tank.

7. The method for temporarily smoldering converter slag according to claim 6, characterized in that: The number of the circular drainage holes is 6-10, and the diameter is 10-30 mm.

8. The method for temporarily smoldering converter slag according to claim 1, characterized in that: In the step 3, the slag loading amount of the temporary slag sealing device is more than 10 cm from the upper position of the temporary slag sealing device.

9. The method for temporarily smoldering converter slag according to claim 1, characterized in that: The integrated water pumping and air collecting device comprises a flip cover, which adopts a double-layer structure, with an outer layer being a high-temperature resistant and corrosion-resistant metal shell and an inner layer being a heat-insulating material layer.

10. The method for temporarily smoldering converter slag according to claim 9, characterized in that: It also includes a spraying device and an air collecting device, and the air collecting device is connected to the wet electrostatic precipitator.