CN114085935A - Short-process thermal-state steel slag treatment system and use method thereof - Google Patents
Short-process thermal-state steel slag treatment system and use method thereof Download PDFInfo
- Publication number
- CN114085935A CN114085935A CN202111621151.5A CN202111621151A CN114085935A CN 114085935 A CN114085935 A CN 114085935A CN 202111621151 A CN202111621151 A CN 202111621151A CN 114085935 A CN114085935 A CN 114085935A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- hot
- area
- stewing
- thermal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a short-process thermal state steel slag treatment system and a use method thereof, wherein the system comprises: in the continuous thermal braising device, the hot steel slag sequentially passes through a tank stopping area, a material distribution area, a thermal braising area and a discharging area to finally obtain qualified thermal braising steel slag; the dust removal device purifies the flue gas and reaches the emission standard. The invention further discloses a method for treating steel slag by applying the system, which comprises the following steps: firstly, placing hot steel slag into a continuous hot braising device to stop a tank area, uniformly distributing the steel slag in a distributing area, quickly cooling the steel slag to a preferable hot braising temperature range in the hot braising area, and discharging qualified hot braising steel slag in a discharging area. The system and the method can realize short-flow rapid treatment of the thermal steel slag, and obtain the thermally-stewed steel slag with higher pulverization rate, lower free calcium oxide and lower water content. Under the condition of ensuring clean production, the system has high equipment and automation degree, less labor and personnel, and low operation cost.
Description
Technical Field
The invention relates to the field of metallurgical energy conservation and environmental protection, in particular to a short-process thermal-state steel slag treatment system and a using method thereof.
Background
The steel industry is the basic industry of national economy, the annual output of the steel slag serving as a derivative of the steel-making process flow is continuously increased along with the increase of the steel output, but the data show that the utilization rate of the steel slag is very low, and a certain distance is left from the goal of zero emission of solid wastes of the steel enterprises. The advanced and effective treatment technology and the new resource utilization technology are actively developed and applied, the utilization rate and the added value of the technology are improved, and the method is one of the important subjects of the iron and steel enterprises to develop the circular economy and realize the sustainable development. At present, the recovery and treatment of molten steel slag mainly comprises water quenching, hot splashing, hot braising, tray splashing, air quenching, roller method and the like.
The hot splashing method and the tray splashing method are suitable for treating various forms of steel slag, but the treatment period is long, the occupied area is large, and the environmental pollution is serious. The air quenching method is similar to the water quenching method except that the cooling medium is different. The air quenching method and the water quenching method can only treat the liquid steel slag, and the grinding power consumption of the steel slag treated by the air quenching method and the water quenching method is high. At present, the domestic application is mainly a hot stewing method and a roller method.
The Bao steel roller method is used as an important technology for treating the steel slag and is improved and optimized for many times, the process of the method is mature day by day, and the Bao steel roller method has the advantages of short flow and short slag treatment time, and is popularized to a certain extent in China. However, the roller method has the fatal defect that only liquid steel slag with good fluidity can be processed, the processed steel slag has single type, and the steel slag has high temperature and good fluidity. Although some improvements are made, as described in patent CN201520452214.2, the ideal effect is not achieved in the actual process, and a hot braising production line is specially used for specially treating non-liquid steel slag with crusting or caking on the surface.
The thermal braising method is used as a mainstream technology for treating the steel slag, a pool type thermal braising treatment method is formed after three generations of improvement, solid steel slag at about 800 ℃ initially enters a pool and the liquid steel slag at present directly enters the pool, the adaptability of the treated steel slag is expanded, and the treated steel slag has good stability. However, the pool type heat-soaking treatment method mainly comprises the operation of engineering machinery, has low degree of automation operation and poor post operation environment, and is difficult to meet the current requirements.
The invention patent CN201110083643.3 discloses a method for pressure heat braising treatment of molten steel slag by waste heat, which is called as a fourth generation heat braising method. The method is characterized by comprising the following steps: 1) tipping the molten steel slag, and tipping the molten steel slag into a pretreatment chamber by a slag pot tipping vehicle; 2) rolling and crushing, namely spraying water on the surface of the molten steel slag by using an automatic water spraying device in the pretreatment chamber for cooling, and rolling and crushing by using a rolling crusher; 3) pushing slag, namely pushing the cooled blocky high-temperature steel slag in the pretreatment chamber to a discharge opening by a rolling crusher to enter a slag groove; 4) transferring, wherein the transfer trolley transfers the slag groove filled with the blocky high-temperature steel slag to a waste heat pressure heat stewing tank; 5) and (3) digesting, namely spraying water on the surface of the massive high-temperature steel slag to generate steam and digesting f-CaO and f-MgO under alternating steam pressure to make the steel slag self-decompose and pulverize. The technology accelerates the steel slag hot stewing reaction by increasing the reaction pressure, thereby shortening the hot stewing time. The pressure is usually required to increase to 0.3-0.4MPa for practical production processes. The reaction vessel is a pressure vessel with the pressure not less than 0.1Mpa, so that the explosion risk exists, the requirements on equipment manufacturing and control precision are higher, the registration and declaration are required when the reaction vessel is put into use, and the safety protection requirement is higher.
The hot braising process can be suitable for various types of steel slag, but has the defects of intermittent operation, long flow and long treatment time: opening the cover halfway in the pool type thermal annealing process, and manually excavating and digging for multiple times; the pressure-heat stewing needs a plurality of devices to be combined and is subjected to the working procedures of tipping, cooling, rolling and crushing, transferring, heat stewing, discharging and the like, the treatment time of the whole process is longer, and the risk coefficient is high. Therefore, the prior art has room for improvement in the aspects of strong adaptability, short flow, short treatment time, more environment-friendly treatment process and the like of compatibly treating the steel slag.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention designs the system for treating the thermal steel slag and the use method thereof, wherein the system has the advantages of short-flow rapid treatment, strong adaptability to steel slag treatment, high automation degree, less labor and personnel reservation and clean production.
The invention provides a short-flow thermal state steel slag treatment system, which comprises:
the continuous hot stewing device is used for processing hot steel slag in one step to obtain qualified hot stewed steel slag and comprises:
the tank stopping area is used for pouring the hot steel slag into the continuous thermal braising device;
the material distribution area is used for arranging the thermal-state steel slag at the annular furnace bottom;
the hot stewing area is used for carrying out the hot stewing reaction on the steel slag quickly;
and the material distribution area is provided with a continuous discharging mechanism and is used for continuously discharging the steel slag.
And the dust removal device is used for carrying out centralized purification treatment on the dust-containing flue gas generated in the process to reach the flue gas emission standard.
In addition, the system for processing thermal steel slag by the short flow of the invention can also have the following additional technical characteristics:
the continuous hot stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, and a water seal groove is adopted for sealing between the annular shell and the rotatable annular furnace bottom. The annular structure is provided with a tank stopping area, a material distribution area, a hot stewing area and a material discharging area along the circumference in sequence, and the material distribution area is adjacent to the material discharging area. And the hot steel slag enters a continuous hot braising device and sequentially passes through a tank stopping area, a material distribution area, a hot braising area and a material discharging area to finally obtain qualified hot braising steel slag. Preferably, partition plates are respectively arranged between the material distribution area and the heat stewing area and between the heat stewing area and the material discharging area. The thermal stewing area is provided with an exhaust hole adjacent to the discharging area for exhausting thermal stewing gas.
Preferably, the tank stopping area is provided with a tilting mechanism for tilting the container filled with the steel slag to slowly pour the steel slag out.
Preferably, the material distribution area is provided with a large slag lump outlet, and when the processed steel slag is liquid steel slag, the outlet can be omitted if no large slag lump exists.
Preferably, the material distribution area is provided with a roller with roller teeth, and the roller teeth are regularly distributed on the surface of the roller at certain intervals. Preferably, the first and second electrodes are formed of a metal,
the roller teeth and the steel slag move relatively to push the steel slag backwards, smash the large steel slag, and form a steel slag layer on the annular furnace bottom to move towards the rear of the roller. The roller tooth is certain regular distribution, and the unable garrulous big sediment of hitting sticks together will be moved the export discharge that sticks together to big sediment gradually by the roller tooth, as other optional schemes, also can adopt other mechanical structure will not stick together by broken big sediment and discharge, if arm, hydraulic push rod etc.. The minimum distance between the roller teeth and the annular furnace bottom is the thickness of a steel slag layer, the thickness of the steel slag layer is preferably 50-600mm, and the thickness of the steel slag layer can be adjusted according to different steel slag properties and process conditions. As another preferred technical scheme, one or more rollers can be added behind the rollers in the material distribution area, the rotating direction of the added rollers is opposite to that of the original rollers, the roller teeth of the added rollers are closer to the annular furnace bottom, and the roller teeth can further crush and stir the steel slag layer formed by the front rollers.
Preferably, a closed cover is arranged above the tank stopping area and the material distribution area and used for collecting dust-containing smoke and reducing the overflow of smoke dust so as to achieve clean production. The movable plate is arranged above the closed cover, is in a normally closed state during production, and is opened and closed for a short time when the crane lifts the container filled with the hot steel slag into or out of the continuous thermal braising device so as to ensure that smoke does not overflow when the steel slag and the steel slag are overturned for distribution.
Preferably, the dust removal device is connected with the closed cover through a pipeline, and dust-containing smoke generated in the tank stopping area and the material distribution area is collected and purified.
Preferably, the dust removal device is also connected with the discharge area through a pipeline, and is used for collecting and purifying dust-containing flue gas generated in the continuous discharge process.
Preferably, the hot stewing area is provided with a spraying system for controlling the hot stewing area to spray water to cool the steel slag. The spraying system reasonably arranges water spraying cooling points in the hot stewing area and monitors the temperature in the hot stewing area. The purpose of regulating and controlling the temperature of the thermal stewing zone is achieved by controlling the water quantity and detecting the temperature, so that the thermal stewing reaction is ensured to be in a better temperature range, and the reaction speed is accelerated.
Preferably, the exhaust hole is connected with heat-extraction stewing gas outside the chimney. More preferably, the exhaust hole is connected with a fan to extract the hot stewing gas in the hot stewing zone.
The invention further provides a method for treating steel slag by applying the system, which comprises the following steps:
A. hoisting the container containing the thermal steel slag to a continuous thermal braising device by a crane;
B. opening the closed cover, and placing the steel slag container on a tilting mechanism of the tank stopping area;
C. closing the closed cover, tipping the steel slag to the selective charging furnace bottom, and enabling the steel slag to enter a material distribution area along with the rotary furnace bottom;
D. the material distribution area roller mechanism strikes the steel slag, and the steel slag is uniformly arranged at the bottom of the rotary furnace according to a certain thickness. The large steel slag is crushed by the roller teeth, and large slag lumps which cannot be crushed are discharged from a large slag lump outlet;
E. the steel slag enters a hot stewing area along with the furnace bottom, the hot stewing area sprays water to quickly cool the steel slag to a preferable hot stewing temperature range, the steel slag is quickly subjected to a hot stewing reaction, generated hot stewing gas is discharged from an exhaust hole, and qualified hot stewed steel slag is obtained finally after the reaction;
F. and the qualified hot-stewed steel slag enters a discharging area along with the furnace bottom and is discharged out of the continuous hot-stewed device by a continuous discharging mechanism.
G. The flue gas generated in the treatment process is discharged after being purified by a dust removal device.
In the invention, the thermal state steel slag in the step A is waste slag generated in the steel smelting process, the temperature is 400-1600 ℃, the shape, viscosity and components of the steel slag are not limited, and the steel slag can be processed in solid state and liquid state. The steel slag container is not limited, and the steel slag can, the slag basin, the slag groove and the like can be used.
And furthermore, the thickness of the steel slag layer in the material distribution area in the step D is 50-600 mm. In the forward direction of the steel slag, the roller teeth continuously throw and smash the steel slag backwards to form large blocks of steel slag.
Furthermore, in the hot stewing area in the step E, a spraying system sprays water to cool the steel slag, so that the temperature of the steel slag can be reduced from 1600 ℃ to 400 ℃. The temperature field of the steel slag on the upper layer and the lower layer is controlled to be more uniform in the thermal stewing process, the temperature is controlled within the range of 200-500 ℃, and more preferably, the thermal stewing temperature range is preferably 280-500 ℃. The air pressure in the hot stewing area is-200 pa-150 pa, and the adjustment is carried out according to different technological requirements of different steel slags.
And E, discharging the qualified hot-braised steel slag in the steps F and the continuous hot-braising device, wherein the temperature is lower than 150 ℃, and the granularity is more than 90% and less than 150 mm. Preferably, the granularity of the steel slag is more than 75% and less than 50 mm. More preferably, less than 2.5% free calcium oxide is contained. And feasibility is provided for the next working procedures of magnetic separation of slag iron and manufacturing building materials from tailings.
The steel slag is self-pulverized and free calcium oxide is degraded by steel slag hot braising reaction in a continuous hot braising device, and the steel slag hot braising reaction comprises physical change and chemical reaction:
1. physical change
The physical change means that the high-temperature steel slag is rapidly cooled when meeting water vapor, and the slag shell is cracked and separated due to uneven cold contraction caused by different expansion coefficients of steel and slag.
In addition, as the temperature of the steel slag is reduced, at 500 ℃, the beta-C2S in the slag begins to generate crystal form transformation, the transformation is carried out to gamma-C2S, the volume expansion is 12 percent, and the steel slag is further pulverized. Therefore, the temperature is slowly reduced at 500 ℃, and the pulverization rate of the steel slag can be improved.
2. Chemical reaction
The chemical reaction refers to hydrolysis reaction of free calcium oxide and magnesium oxide in the steel slag when meeting water vapor. The hydrolysis reaction eliminates the instability of the steel slag and is the basis of the resource utilization of the steel slag. The specific reaction comprises 97.8 percent of volume expansion of CaO + H2O = = Ca (OH)2 and 148 percent of volume expansion of MgO + H2O = = Mg (OH) 2.
CaO + H2O (g) = Ca (OH)2 the reaction belongs to exothermic reaction, in the stage of 0-300 ℃, the temperature is the largest influence factor influencing the reaction rate, and the pressure influence is larger than the temperature when the temperature is higher than 300 ℃, so the steel slag hot stewing temperature is larger than 300 ℃ under normal pressure, and the free calcium oxide reaction is fastest. When the temperature is higher than 580 ℃, the reverse reaction occurs, namely, the free calcium oxide in the steel slag does not react with the water vapor. MgO + H2O (g) = Mg (OH)2 when the reaction is at 380 ℃ under normal pressure, the reverse reaction occurs, and the free magnesium oxide does not react with water vapor.
Therefore, the preferable temperature range for thermal braising of the steel slag under normal pressure is preferably 280-500 ℃, and the temperature of the steel slag is further controlled to be slowly reduced from 500 ℃, so that the rapid thermal braising can be realized.
The traditional steel slag hot-stewing material layer is too thick, the thickness of the pool type hot-stewing material layer reaches 2.5 m, water drops cannot penetrate through the material layer and directly hit the inside of the material layer, so that the temperature field is not uniform, the temperature of the steel slag on the surface layer is lower than 200 ℃, and the hot-stewing reaction speed is slow; the temperature of the internal steel slag is higher than 550 ℃, and free calcium oxide and magnesium do not react with water vapor, so the whole hot stewing time is increased by 12 hours. The process continuously thins the steel slag layer by a special device structure and process control, increases the reaction contact area of water vapor and the steel slag, and uniformly controls the temperature fields above and below the steel slag layer in a better thermal braising reaction temperature range to realize rapid thermal braising reaction, thereby achieving the purpose of short-flow rapid treatment of the thermal steel slag. The time from the thermal state steel slag to the qualified hot-stewed steel slag can be shortened to 1 hour or even shorter.
The thermal braising reaction can realize the self-pulverization of the steel slag and the self-degradation of free calcium oxide and free magnesium oxide, so that the steel slag after thermal braising has small granularity, is easy to grind compared with the steel slag obtained by other processes, is suitable for further processing and magnetic separation utilization, can finally obtain the steel slag tailings with lower free calcium oxide and free magnesium oxide, and is favorable for being reused as a building material with higher quality.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a short-flow thermal steel slag treatment system according to one embodiment of the present invention;
figure 2 is a schematic plan view of a continuous thermal annealing apparatus according to one embodiment of the present invention;
figure 3 is a cross-sectional view of a material area of a continuous heat-sealing apparatus according to one embodiment of the present invention;
figure 4 is a cross-sectional view of a heat soak zone of a continuous heat soak apparatus according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In a first aspect of the present invention, the present invention provides a short-flow thermal steel slag processing system, which includes, according to an embodiment of the present invention and referring to fig. 1:
a continuous thermal braising device 100 which is provided with a hot steel slag inlet 101, a dust-containing flue gas outlet 102, a large slag lump 103 outlet, a thermal braising gas outlet 104 and a thermal braising steel slag outlet 105;
the dust removal device 200 is provided with a dust-containing flue gas inlet 201 and a purified gas outlet 202, and the dust-containing flue gas inlet 201 is connected with the dust-containing flue gas outlet 102.
The steel slag continuous hot braising system according to the embodiment of the invention is described in detail with reference to fig. 1 to 4 as follows:
according to an embodiment of the present invention, the continuous thermal annealing apparatus 100 is used for processing hot steel slag in one step to obtain qualified thermally annealed steel slag, and comprises: a tank stopping area 110 for dumping the hot steel slag into the continuous thermal braising device; the material distribution area 120 is used for arranging the thermal-state steel slag on the annular furnace bottom; a hot-braising zone 130 for carrying out rapid hot-braising reaction on the steel slag; and a discharging area 140 for continuously discharging the steel slag.
The dust removal device 200 is used for performing centralized purification treatment on the dust-containing flue gas generated in the process to reach the flue gas emission standard.
According to the embodiment of the invention, the continuous thermal annealing device 200 is of an annular structure and comprises an annular shell 133 and a rotatable annular furnace bottom 134, wherein the annular shell 133 covers the rotatable annular furnace bottom 134 to form an annular cavity, and the annular shell 133 and the rotatable annular furnace bottom 134 are hermetically connected by adopting the water seal groove 13 to prevent gas from overflowing. The annular structure is provided with a tank stopping area 110, a material distribution area 120, a heat stewing area 130 and a material discharging area 140 along the circumference in sequence, and the material distribution area 120 is adjacent to the material discharging area 140. As shown in fig. 2, the tank stopping area 110 corresponds to an angle b; the cloth area 120 corresponds to an angle c; the corresponding angle of the thermal annealing zone 130 is d; the corresponding angle of the discharging area 140 is a, the corresponding angles of the sub-areas can be optimally adjusted or combined as required, and the corresponding angle d of the thermal stewing area 130 is more than or equal to 200 degrees in order to ensure the thermal stewing effect. The hot steel slag enters a continuous hot braising device 100 and sequentially passes through a tank stopping area 110, a material distribution area 120, a hot braising area 130 and a discharging area 140, and finally the qualified hot braising steel slag is obtained. Partition plates 131 are respectively arranged between the material distribution region 120 and the heat-stewing region 130 and between the heat-stewing region 130 and the material discharge region 140. The thermal annealing zone 130 is provided with an exhaust hole 133 adjacent to the discharging zone 140 for discharging thermal annealing gas.
According to an embodiment of the present invention, the stopping area 110 is provided with a tilting mechanism 111 for tilting the vessel containing the steel slag to slowly pour out the steel slag. The distributing region 120 is provided with a large slag lump outlet 103.
According to the embodiment of the present invention, the material distribution area 120 further has a roller 121 with teeth 122, and the teeth 122 are regularly distributed on the surface of the roller at certain intervals. The roller teeth 122 move relative to the steel slag 136 to push the steel slag backward, break up the large steel slag, form a steel slag layer on the annular hearth 134, and move backward of the roller. The roller tooth is certain regular distribution, and the big sediment that can't hit garrulous sticks together will be moved gradually by the roller tooth and stick together export 103 discharges to big sediment. The minimum distance h between the roller teeth and the annular furnace bottom is the thickness of a steel slag layer, the thickness of the steel slag layer is preferably 50-600mm, and the thickness of the steel slag layer can be adjusted according to different steel slag properties and process conditions. In some embodiments, it is also preferable to add one or more rollers after the rollers in the distribution area, the added rollers rotating in the opposite direction to the original rollers, and the added rollers having roller teeth closer to the bottom of the circular furnace, the roller teeth further crushing and stirring the steel slag layer formed by the previous rollers.
According to the embodiment of the invention, a closed cover 112 is arranged above the tank stopping area 110 and the material distribution area 120 and used for collecting dust-containing smoke and reducing the overflow of smoke dust, so that clean production is achieved. A movable plate is arranged above the closed hood 112, and is in a normally closed state during production, and when a container filled with hot steel slag is hoisted into or out of the continuous hot braising device by a crane, the movable plate is opened for a short time and then closed. Ensuring that the smoke does not overflow when the steel slag and the steel slag are tipped for distribution.
According to the embodiment of the invention, the dust removing device 200 is connected with the closed hood 112 through a pipeline, and collects and purifies the dust-containing flue gas generated by the tank stopping area 110 and the material distribution area 120.
According to the embodiment of the present invention, the dust removing device 200 is further connected to the discharging area 140 through a pipe, and collects and purifies the dust-containing flue gas generated during the continuous discharging.
According to the embodiment of the invention, the hot stewing area is provided with a spraying system 132 for controlling the hot stewing area to spray water to cool the steel slag. The spraying system 132 reasonably arranges water spraying cooling points in the thermal annealing area and monitors the temperature in the thermal annealing area in real time. The purpose of regulating and controlling the temperature of the thermal stewing zone is achieved by controlling the water quantity and detecting the temperature, so that the thermal stewing reaction is ensured to be in a better temperature range, and the reaction speed is accelerated. The whole treatment time can be shortened to 1 hour.
According to the embodiment of the invention, the exhaust hole 133 is connected with the heat-extraction smoldering gas outside the chimney. In some embodiments, it is more preferable that the air vent 133 is connected to a fan to draw out the hot-stewing air in the hot-stewing zone, and the air pressure in the hot-stewing zone is adjusted by different air volume.
According to an embodiment of the present invention, the material distribution area 140 is provided with a screw discharging machine 141 for continuously discharging the qualified hot-stewed steel slag out of the hot-stewing device.
In a second aspect of the present invention, a method for processing hot steel slag according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 4, the method according to an embodiment of the present invention comprising:
A. a crane lifts the container filled with the thermal steel slag to the continuous thermal braising device 100;
B. opening the closed cover 112, and placing the steel slag container 113 on the tilting mechanism 111 of the tank stopping area 110;
C. closing the closed hood 112, tipping the steel slag to the selective charging furnace bottom, and enabling the steel slag to enter the material distribution area 120 along with the rotary furnace bottom;
D. the material distribution area roller mechanism 121 strikes the steel slag, and the steel slag is uniformly arranged at the annular rotary furnace bottom 134 according to a certain thickness. The large steel slag is crushed by the roller teeth, and large slag lumps which cannot be crushed are discharged from a large slag lump outlet 103;
E. the steel slag enters a hot stewing area 130 along with the furnace bottom, the hot stewing area sprays water to quickly cool the steel slag to a preferable hot stewing temperature range, the steel slag is quickly subjected to a hot stewing reaction, generated hot stewing gas is discharged from an exhaust hole 133, and qualified hot stewing steel slag is obtained finally after the reaction;
F. the qualified hot-stewed steel slag enters the discharging area 140 along with the furnace bottom and is discharged out of the continuous hot-stewing device by the continuous discharging mechanism 141.
G. The flue gas generated in the treatment process is discharged after being purified by the dust removal device 200.
In the invention, the thermal state steel slag in the step A is waste slag generated in the steel smelting process, the temperature is 400-1600 ℃, the shape, viscosity and components of the steel slag are not limited, and the steel slag can be processed in solid state and liquid state. The steel slag container is not limited, and the steel slag can, the slag basin, the slag groove and the like can be used.
Further, the thickness of the 120 steel slag layer in the material distribution area in the step D is 50-600 mm. In the forward direction of the steel slag, the roller teeth continuously throw the steel slag backwards to break up large blocks of the steel slag.
Further, in the thermal annealing zone 130 of the step E, the spraying system 132 sprays water to cool the steel slag, so that the temperature of the steel slag can be reduced from 1600 ℃ to 400 ℃. The temperature fields of the steel slag on the upper layer and the lower layer are controlled to be more uniform in the process of thermal braising, the temperature is controlled to be 200-500 ℃, and the temperature can be accurately controlled to be 280-500 ℃. The air pressure in the hot stewing area is-200 pa-150 pa, and the adjustment is carried out according to different technological requirements of different steel slags.
And E, discharging the qualified hot-braised steel slag in the steps F and E out of the continuous hot-braising device 100, wherein the temperature is lower than 150 ℃, and the granularity is more than 90% and less than 150 mm. Preferably, the granularity of the steel slag is more than 75% and less than 50 mm. More preferably, less than 2.5% free calcium oxide is contained. And feasibility is provided for the next working procedures of magnetic separation of slag iron and manufacturing building materials from tailings.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The invention discloses a short-process thermal state steel slag treatment system, which is characterized by comprising the following steps:
the continuous hot stewing device is used for processing hot steel slag in one step to obtain qualified hot stewed steel slag and comprises: the tank stopping area is used for feeding the hot steel slag into the continuous thermal braising device; the material distribution area is used for arranging the thermal-state steel slag at the annular furnace bottom; the hot stewing area is used for carrying out the hot stewing reaction on the steel slag quickly; a discharging area for continuously discharging the thermally-stewed steel slag;
and the dust removal device is used for carrying out centralized purification treatment on the dust-containing flue gas generated in the process to reach the flue gas emission standard.
2. The system for short-process treatment of hot steel slag according to claim 1, wherein:
the continuous thermal stewing device is structurally of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, a water seal groove is adopted for sealing between the annular shell and the rotatable annular furnace bottom, the annular structure is sequentially provided with a tank stopping area, a material distribution area, a thermal stewing area and a material discharging area along the circumference, the material distribution area is adjacent to the material discharging area, thermal steel slag enters the continuous thermal stewing device and sequentially passes through the tank stopping area, the material distribution area, the thermal stewing area and the material discharging area to finally obtain qualified thermal stewing steel slag, and an exhaust hole is formed in the thermal stewing area close to the material discharging area and used for exhausting thermal stewing gas.
3. The system for short-process treatment of hot steel slag according to claims 1-2, wherein:
and the tank stopping area is provided with a tilting mechanism for tilting the container filled with the steel slag to slowly pour out the steel slag.
4. The system for short-process treatment of hot steel slag according to claims 1-2, wherein:
the material distribution area is provided with a roller with roller teeth, and the roller teeth are regularly distributed on the surface of the roller at certain intervals.
5. The system for short-process treatment of hot steel slag according to claims 1-2, wherein:
and a closed cover is arranged above the tank stopping area and the material distribution area and used for collecting dust-containing smoke, a movable plate is arranged above the closed cover and is in a normally closed state, and when a crane lifts a container containing hot steel slag into or out of the continuous thermal braising device, the movable plate is opened for a short time and then closed.
6. The system for short-process treatment of hot steel slag according to claims 1 and 5, wherein:
the dust removal device is connected with the closed cover and the discharging area.
7. The system for short-process treatment of hot steel slag according to claim 1, wherein:
and the hot stewing area is provided with a spraying system for controlling the hot stewing area to spray water to cool the steel slag.
8. A method of processing steel slag using the system of any one of claims 1 to 7, comprising the steps of:
a. hoisting the container containing the thermal steel slag to a continuous thermal braising device by a crane;
b. opening the closed cover, and placing the steel slag container on a tilting mechanism of the tank stopping area;
c. closing the closed cover, tipping the steel slag, and enabling the steel slag to enter a material distribution area along with the rotary furnace bottom;
d. striking the steel slag by a roller mechanism in a material distribution area, and uniformly arranging the steel slag at the bottom of a rotary furnace according to a certain thickness;
e. the large steel slag is crushed by the roller teeth, and large slag lumps which cannot be crushed are discharged from a large slag lump outlet;
the steel slag enters a hot stewing area along with the furnace bottom, the hot stewing area sprays water to quickly cool the steel slag to a preferable hot stewing temperature range, the steel slag is subjected to hot stewing reaction to obtain qualified hot stewed steel slag and hot stewing gas, and the hot stewing gas is discharged from a vent hole;
f. the qualified hot-stewed steel slag enters a discharging area along with the furnace bottom and is discharged by a continuous discharging mechanism;
g. the flue gas generated in the treatment process is collected to a dust removal device and is discharged after purification.
9. The system for short-process treatment of hot steel slag according to claims 1 and 8, wherein:
the thermal state steel slag is waste slag generated in the steel smelting process, and the temperature is 400-1600 ℃.
10. The system for short-process treatment of hot steel slag according to claims 1 and 8, wherein:
when the qualified hot-stewed steel slag is discharged out of the continuous hot-stewing device, the temperature is lower than 150 ℃, and the granularity is more than 90% and less than 150 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111621151.5A CN114085935A (en) | 2021-12-28 | 2021-12-28 | Short-process thermal-state steel slag treatment system and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111621151.5A CN114085935A (en) | 2021-12-28 | 2021-12-28 | Short-process thermal-state steel slag treatment system and use method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114085935A true CN114085935A (en) | 2022-02-25 |
Family
ID=80308074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111621151.5A Pending CN114085935A (en) | 2021-12-28 | 2021-12-28 | Short-process thermal-state steel slag treatment system and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114085935A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002064257A2 (en) * | 2001-02-09 | 2002-08-22 | Egon Evertz K.G. (Gmbh & Co.) | Method and device for preparing slag in order to form granulates |
| CN106755664A (en) * | 2016-12-29 | 2017-05-31 | 迁安首钢设备结构有限公司 | Hot steel slag rotating disc is granulated tank arrangement |
| CN112934361A (en) * | 2021-04-02 | 2021-06-11 | 中冶节能环保有限责任公司 | Molten steel slag disc type air-cooling double-rotating-roller crushing treatment device and method |
| CN112934422A (en) * | 2021-04-02 | 2021-06-11 | 中冶节能环保有限责任公司 | Efficient water-cooling crushing device and method for molten steel slag rotating roller |
| CN113061673A (en) * | 2021-03-19 | 2021-07-02 | 中冶节能环保有限责任公司 | Device and method for recycling crushing waste heat of high-temperature steel slag rotating bed |
| CN216947078U (en) * | 2021-12-28 | 2022-07-12 | 北京天朗致达节能环保股份有限公司朝阳分公司 | Short-flow thermal state steel slag treatment system |
-
2021
- 2021-12-28 CN CN202111621151.5A patent/CN114085935A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002064257A2 (en) * | 2001-02-09 | 2002-08-22 | Egon Evertz K.G. (Gmbh & Co.) | Method and device for preparing slag in order to form granulates |
| CN106755664A (en) * | 2016-12-29 | 2017-05-31 | 迁安首钢设备结构有限公司 | Hot steel slag rotating disc is granulated tank arrangement |
| CN113061673A (en) * | 2021-03-19 | 2021-07-02 | 中冶节能环保有限责任公司 | Device and method for recycling crushing waste heat of high-temperature steel slag rotating bed |
| CN112934361A (en) * | 2021-04-02 | 2021-06-11 | 中冶节能环保有限责任公司 | Molten steel slag disc type air-cooling double-rotating-roller crushing treatment device and method |
| CN112934422A (en) * | 2021-04-02 | 2021-06-11 | 中冶节能环保有限责任公司 | Efficient water-cooling crushing device and method for molten steel slag rotating roller |
| CN216947078U (en) * | 2021-12-28 | 2022-07-12 | 北京天朗致达节能环保股份有限公司朝阳分公司 | Short-flow thermal state steel slag treatment system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111850194A (en) | High-temperature steel slag bottom blowing air cooling crushing waste heat recovery device and method | |
| CN101476000B (en) | Thermal state steel slag waste heat recovery system and recovery method | |
| CN115615188B (en) | Oxygen-enriched double-chamber molten pool smelting side-blown furnace and method for extracting iron and quenching molten steel slag | |
| CN103540698B (en) | Steel slag granulating and afterheat recycling device | |
| CN109022808A (en) | A kind of comprehensive recovering process of the dust of Ferrous Metallurgy containing zinc | |
| CN201273767Y (en) | Multifunctional industrial furnace and continuous smelting system comprising the industrial furnace | |
| CN113061673A (en) | Device and method for recycling crushing waste heat of high-temperature steel slag rotating bed | |
| CN111826486A (en) | High-temperature soft molten steel slag accurate-control efficient cleaning crushing treatment device and method | |
| CN112941324A (en) | Novel process for comprehensively utilizing resources containing heavy metal hazardous wastes | |
| CN212426080U (en) | Broken waste heat recovery device of forced air cooling is blown at bottom to high temperature slag | |
| CN211972386U (en) | High-temperature molten slag granulating device | |
| CN216947078U (en) | Short-flow thermal state steel slag treatment system | |
| CN112958246A (en) | High-temperature steel slag disc crushing waste heat recovery device and method | |
| CN105063259B (en) | A kind of blast furnace cinder heat reclaim unit and application method | |
| CN101886148A (en) | Method for recovering high-temperature molten slag | |
| CN108441590A (en) | Continuous thin layer single layer hot application method blast furnace slag dry granulation device and application method | |
| CN215612141U (en) | Broken waste heat recovery device of high temperature slag disc | |
| CN202482336U (en) | System for taking molten slag of blast furnace in shunted mode | |
| CN112797804A (en) | Closed full-dry type non-emission waste heat recovery smelting slag treatment system and process | |
| CN112853013A (en) | High-temperature steel slag waste heat recovery device and waste heat recovery method based on same | |
| CN111206131A (en) | High-temperature molten slag granulating device | |
| CN201836849U (en) | Recovery unit for waste heat of high-temperature industrial slag | |
| CN114085935A (en) | Short-process thermal-state steel slag treatment system and use method thereof | |
| CN114045368B (en) | Continuous steel slag heat stewing system and treatment method thereof | |
| CN214572066U (en) | Broken waste heat recovery device of high temperature slag revolving bed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |