CN212223028U - Molten steel slag blast furnace ash reduction modification device - Google Patents
Molten steel slag blast furnace ash reduction modification device Download PDFInfo
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- CN212223028U CN212223028U CN202021596195.8U CN202021596195U CN212223028U CN 212223028 U CN212223028 U CN 212223028U CN 202021596195 U CN202021596195 U CN 202021596195U CN 212223028 U CN212223028 U CN 212223028U
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Abstract
The utility model relates to a melting slag blast furnace ash reduction modification device, the device includes: the method comprises the following steps of preparing a blast furnace ash ball by using a granulator and providing a reduction modifier for a slag refining furnace based on the characteristics of molten steel slag and blast furnace ash materials. Heating, reducing, modifying and smelting the molten steel slag by using a slag melting furnace to realize that iron oxides in the steel slag and blast furnace dust are reduced to obtain high-quality molten iron, quenching the modified molten slag to obtain high-activity modified slag, and performing flue gas treatment by using a dust collection system to obtain zinc-rich powder. The maximum recycling of four resources of heat energy, iron, carbon and zinc in the molten steel slag and the blast furnace ash can be realized; the method has the advantages of simple process, low equipment difficulty and high resource recovery value, and the treatment by the method is expected to realize the full high-added-value utilization of the refractory solid wastes of the steel slag and the blast furnace ash in two large steel industries.
Description
Technical Field
The utility model relates to a molten steel slag blast furnace ash reduction modification device, in particular to a device for directly adding blast furnace ash into molten steel slag generated by steel making of steel enterprises as a main reduction modifier.
Background
About 0.12-0.14 tons of steel slag is generated per 1 ton of steel, the generation amount of the steel slag in China in 2019 is about 1.3 hundred million tons, and the utilization rate is 30%. A large amount of steel slag tailings cannot be recycled, the newly increased steel slag stacking amount is more than 8000 million tons every year, the accumulated stacking amount is more than 10 hundred million tons, a large amount of land is occupied, water systems and soil are polluted, and serious potential safety hazards are caused.
The main chemical components of the steel slag comprise CaO and SiO2、FeO、Fe2O3And the like. The steel slag has two resource recovery values of iron and calcium silicate in terms of chemical composition, and has great economic and social values if all the resources are utilized. In addition, the slag temperature of the steel slag exceeds 1600 ℃, the heat value of each ton of slag exceeds 50kg of standard coal, and the method has great heat energy recovery value. In a word, the steel slag has 3 resource utilization values of iron, calcium silicate and heat energy. 5-10% of residual steel in the steel slag is usually partially recycled through grinding and magnetic separation, the obtained steel scrap and magnetic separation powder flow into a metallurgical process, and the residual steel slag tailings with the content of nearly 80% cannot be utilized with high added value. The recycling of the waste heat of the molten steel slag still belongs to the laboratory stage, and no breakthrough of real industrial application exists.
The blast furnace ash is dust removed ash generated in the blast furnace smelting process, and usually contains 25-40% of C and 30-40% of FeO and Fe2O3And 1-5% of oxides such as ZnO and the like, and has important carbon, iron and zinc resource recovery value. The annual blast furnace ash production in China exceeds 3000 ten thousand tons, and the method has great economic and social values if effective resource utilization is realized. At present, three main processes are used for treating blast furnace ash. The most common application is that blast furnace ash directly returns to a sintering smelting process, and the mode has the problem of enrichment of blast furnace zinc element. In addition, two dezincification treatment processes of a rotary kiln and a rotary hearth furnace are adopted, wherein the rotary kiln treatment process has more environmental problems, and the rotary hearth furnace has the problems of high operation cost and the like. Therefore, a more reasonable blast furnace ash disposal process method is urgently needed, the dezincification cost of the blast furnace ash is reduced, and the better resource utilization is realized.
In the aspect of improving the value of steel slag, a large amount of research is carried out by the past scholars. The steel slag is subjected to reduction modification under the high-temperature molten state condition, so that the heat of the thermal-state steel slag can be fully utilized, more iron and calcium silicate material resources are recycled, and the method is an effective means for realizing the maximum utilization of the steel slag resources. But the method is limited by the cost problem of high-temperature smelting, and the problems of high cost, high smelting difficulty and the like exist in the addition of materials such as conventional reducing agents, so that the breakthrough of industrial production is not realized, and the method stays in the laboratory stage for a long time.
The utility model discloses based on melting slag and blast furnace ash material characteristic, creative proposition adopts the blast furnace ash to carry out the method that reduces and modifies to melting slag. By adopting the method and the system equipment, the maximum recycling of the four resources of heat energy, iron, carbon and zinc in the molten steel slag and the blast furnace ash can be realized. The method has the advantages of simple process, low equipment difficulty and high resource recovery value, and the treatment by the method is expected to realize the full high-added-value utilization of the solid wastes which are difficult to treat in two large steel industries, namely steel slag and blast furnace dust, and the utility model has obvious technical and economic advantages. The current environmental protection policy in China is tightened increasingly, and the resource utilization work of bulk industrial solid wastes such as steel slag, blast furnace ash and the like is paid unprecedented attention by enterprises. The new process for treating the steel slag and the blast furnace ash can obtain greater economic benefit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a melting steel slag blast furnace ash reduction modification device, melting steel slag blast furnace ash reduction modification device includes: the device comprises a blast furnace ash bin (1), a granulator (2), a steel slag bag (4), a slag refining furnace (5), a modified material bin (6), a feeder (7), a slag flushing tank (8), a water quenching pool (9), a high-pressure water gun (10), a ladle (12) and a dust collecting system (13); the blast furnace ash bin (1) is operatively connected with the granulator (2) and is used for uniformly feeding blast furnace ash in the blast furnace ash bin (1) into the granulator (2) for granulation to prepare blast furnace ash balls (3), the granulator (2) is operatively connected with the modification bin (6) and is used for feeding the blast furnace ash balls (3) into the modification bin (6), the modification bin (6) is arranged above the feeding machine (7), and the slag smelting furnace (5) is arranged below the feeding machine (7) and is used for feeding modified materials comprising the blast furnace ash balls (3) into the slag smelting furnace (5); the steel slag ladle (4) is operably connected with the slag smelting furnace (5) and is used for pouring molten steel slag in the steel slag ladle (4) into the slag smelting furnace (5); the slag flushing groove (8) is arranged below the slag smelting furnace (5) and is used for pouring the modified slag on the upper part in the slag smelting furnace (5) into the slag flushing groove (8) for slag discharging operation; the ladle (12) is arranged below the slag smelting furnace (5) and used for pouring molten iron in the slag smelting furnace (5) into the ladle (12), the water quenching tank (9) is arranged on one side of the slag flushing tank (8) in the forward direction, and the high-pressure water gun (10) is arranged above the slag flushing tank (8) and used for pouring molten slag into the water quenching tank (9) along the slag flushing tank (8) under the impact force of the high-pressure water gun (10) to carry out quenching so as to obtain modified slag; the dust collecting system (13) is partially connected above the slag smelting furnace (5) and is used for pumping away smoke generated in the smelting process of the slag smelting furnace (5).
Wherein, the melting steel slag blast furnace ash reduction modification device also comprises: a modified slag bin (11) and a zinc-rich powder bin (14); the modified slag obtained after water quenching in the water quenching tank (9) is transported to a modified slag bin (11) through a conveyor belt or an automobile; the dust collecting system (13) collects the obtained dust to be rich zinc powder, and the dust is transported to a zinc powder rich bin (14) through a conveyor belt or an automobile.
Wherein, the granulator (2) is operatively connected with the modification bin (6) through a conveyor belt or an automobile and is used for transporting the blast furnace ash balls manufactured by the granulator (2) to the modification bin (6) through the conveyor belt or the automobile. The blast furnace ash bin (1) adopts a closed bin, and the blast furnace ash bin (1), the modified slag bin (11) and the zinc-rich powder bin (14) are made of concrete or steel structures. The granulator (2) is a disc granulator, the rotating speed is 5-30 r/min, and the inclination angle is 30-50 degrees. The slag smelting furnace (5) is an electric arc smelting furnace, the highest smelting temperature can be provided to exceed 1800 ℃, and a refractory material is arranged in the slag smelting furnace (5). The feeding machine (7) is a vibrating feeding machine, the vibration frequency is 800-1000 rpm, the inclination angle is 15-25 degrees, and the amplitude is 5-10 mm. The depth of the slag flushing groove (8) is not less than 150mm, the width of the slag flushing groove is not less than 200mm, and a refractory material is arranged in the slag flushing groove. The water quenching tank (9) is a water tank with a concrete structure, the depth of the water quenching tank (9) is not less than 800mm, and the water temperature is not more than 85 ℃. The high-pressure water gun (10) provides the highest water pressure not lower than 0.3 MPa. The dust collecting system (13) is provided with a gravity dust collector, a bag ash dust collector, a fan and a chimney; the gravity dust collector, the bag ash dust collector, the fan and the chimney are sequentially connected through a pipeline, the dust collection system (13) starts negative pressure dust collection from the upper side of the slag refining furnace (5), gravity settling dust collection is sequentially carried out through the gravity dust collector, then dust collection is carried out through the bag dust collector, then the dust is discharged through the fan and the chimney, and the fan provides a negative pressure condition through induced air, so that the discharge of smoke is realized.
The utility model relates to a method for reducing and modifying molten steel slag blast furnace ash, preferably adopting the device to carry out the method for reducing and modifying, which is characterized by comprising the following steps:
(1) uniformly feeding blast furnace ash in a blast furnace ash bin (1) into a granulator (2) for granulation to prepare blast furnace ash balls (3), naturally airing or drying the blast furnace ash balls (3), conveying the blast furnace ash balls to a modification bin (6), and providing a reduction modifier for a slag smelting furnace (5);
(2) the feeder (7) firstly partially pours the blast furnace ash balls (3) and other modifiers such as blue carbon, coke and/or coal powder in the modification bin (6) into the slag smelting furnace (5), then pours the molten steel slag in the steel slag ladle (4) into the slag smelting furnace (5), and simultaneously pours the rest part into the slag smelting furnace together with the molten steel slag;
(3) starting the slag smelting furnace (5) to heat and carry out reduction modification smelting, wherein the smelting is continuously carried out until the requirement of one-time slag tapping time is met, iron oxides in steel slag and blast furnace ash enter molten iron through reduction deposition, the slag and the molten iron are layered up and down in the slag smelting furnace (5), and the slag with the modified upper part is poured into a slag flushing groove (8) to carry out slag tapping operation;
(4) pouring the poured slag into a water quenching tank (9) along a slag flushing groove (8) under the impact force of a high-pressure water gun (10), carrying out quenching to obtain modified slag, and collecting the modified slag into a modified slag bin (11);
(5) after primary slag discharging is finished, adding molten steel slag and a modifier into the slag refining furnace (5) according to the step (3), smelting and discharging slag for a plurality of times, and pouring molten iron in the slag refining furnace (5) into a ladle (12) after the final slag discharging is finished;
(6) and in the production process of the slag smelting furnace (5), a dust collecting system (13) is adopted to treat the flue gas in the production process to obtain zinc-rich powder, and the zinc-rich powder is uniformly collected into a zinc-rich powder bin (14).
Wherein, the diameter of the blast furnace dust ball (3) prepared by the granulator (2) is 5-50 mm, the water content of the blast furnace dust ball (3) after natural airing or drying is not more than 3%, and the falling strength at 2m is more than 6 times. The smelting materials of the blast furnace ash ball (3) are three materials of steel slag, blast furnace ash and siliceous modifier, wherein the addition amount of the blast furnace ash accounts for 10-30 percent (weight percentage) of the total materials, the addition amount of the steel slag accounts for 65-90 percent (weight percentage) of the total materials, the balance is the siliceous modifier, and the content of silicon oxide in the siliceous modifier is more than 60 percent(weight percent). The smelting temperature of the slag smelting furnace (5) is 1500-1700 ℃, the slag tapping time for one-time smelting is 20-50 minutes, and the slag tapping is carried out for 1-5 times in each smelting period. The slag tapping time of the slag smelting furnace (5) is 2-10 minutes each time, the water supply amount of the high-pressure water gun (10) exceeds the slag tapping amount by 5 times, slag flushing operation is carried out, and the water pressure is 0.1-0.25 MPa. The MFe content in the ladle (12) exceeds 90 percent, and the recovery rate of the iron element exceeds 95 percent. The zinc mass content in the zinc-rich powder bin (14) exceeds 40 percent, and the recovery rate of zinc element exceeds 95 percent. The activity index of the modified slag in the modified slag bin (11) exceeds 90 percent, and meets the requirement of the activity index of the first-grade steel slag powder. The content of the dust in the discharged flue gas of the dust collecting system (13) is lower than 10mg/m3。
Preferably, the depth of the slag flushing groove is not less than 150mm, the width is not less than 200mm, the gradient is not less than 5%, and a refractory material is arranged inside the slag flushing groove. The dust collecting system (13) is arranged above the slag smelting furnace (5), a large dust collecting hood is generally arranged above the slag smelting furnace (5), and smoke generated in the smelting process of the slag smelting furnace (5) is pumped away by negative pressure; the dust collecting system (13) and the zinc-rich powder bin (14) are generally a gravity dust collector and a cloth bag dust collector, and the collected dust is zinc-rich powder which is generally transported to the zinc-rich powder bin (14) by a conveyor belt or an automobile; the modified slag conveying device comprises a water quenching tank (9) and a modified slag bin (11), wherein modified slag obtained after water quenching in the water quenching tank (9) is conveyed into the modified slag bin through a conveying belt or an automobile; a granulator (2) and a modified storage bin (6), wherein blast furnace ash balls manufactured by the granulator are transported to the modified storage bin (6) through a conveyor belt or an automobile. The operable connection is typically a belt or a car or overhead travelling crane connection. The zinc-rich powder is collected by a gravity dust collector and a bag dust collector of a dust collecting system (13), and the dust generated in the smelting process is the zinc-rich powder. The water quenching tank is a water tank with a concrete structure, the depth of the water quenching tank is not less than 800mm, and the water temperature is not more than 85 ℃. The highest water pressure provided by the high-pressure water gun is not lower than 0.3 MPa. The dust collecting system is provided with a gravity dust collector, a bag ash dust collector, a fan and a chimney.
Preferably, the utility model also relates to a method for reducing and modifying the molten steel slag blast furnace ash, which is characterized by comprising the following steps:
(1) and (3) uniformly feeding the blast furnace dust in the blast furnace dust bin into a granulator for granulation to prepare blast furnace dust balls, naturally airing or drying the blast furnace dust balls, and conveying the blast furnace dust balls to a modification bin to provide a reduction modifier for the slag smelting furnace.
(2) The feeder firstly pours part of the blast furnace ash balls and other modifiers in the modification bin into the slag smelting furnace, then pours the molten steel slag in the steel slag ladle into the slag smelting furnace, and simultaneously pours the rest of the modifiers into the slag smelting furnace together with the molten steel slag.
(3) And starting the slag smelting furnace to heat, reduce, modify and smelt, wherein smelting is continuously carried out until the first slag tapping time is met, iron oxides in the steel slag and the blast furnace ash enter molten iron through reduction and deposition, the slag and the molten iron are layered up and down in the slag smelting furnace, and the slag after the upper part is modified is poured into a slag flushing groove to carry out slag tapping operation.
(4) And pouring the poured molten slag into a water quenching tank along a slag flushing groove under the impact force of a high-pressure water gun, carrying out quenching to obtain modified slag, and collecting the modified slag into a modified slag bin.
(5) And after the primary slag discharging is finished, adding molten steel slag and a modifier into the slag refining furnace according to the steps, smelting and discharging slag for a plurality of times, and pouring molten iron in the slag refining furnace into a foundry ladle after the final slag discharging is finished.
(6) And in the production process of the slag smelting furnace, a dust collecting system is adopted to treat the flue gas in the production process to obtain zinc-rich powder, and the zinc-rich powder is collected to a zinc-rich powder bin in a unified way.
Wherein, the diameter of the blast furnace ash ball prepared by the granulator is 5-50 mm, the water content of the naturally dried or dried blast furnace ash ball is not more than 3%, and the falling strength of 2m is more than 6 times. The blast furnace ash ball smelting material mainly comprises three materials of steel slag, blast furnace ash balls and a siliceous modifier, wherein the addition amount of the blast furnace ash balls accounts for 10-30% of the total materials, and the content of silicon oxide in the siliceous modifier exceeds 60%. The smelting temperature of the slag smelting furnace is 1500-1700 ℃, the slag tapping time for one-time smelting is 20-50 minutes, and the slag tapping is performed for 1-5 times in each smelting period. Slag discharging time of the slag smelting furnace is 2-10 minutes each time, slag flushing operation is carried out when water supply of a high-pressure water gun exceeds slag discharging amount by 5 times (weight percentage), and water pressure is 0.1-0.25 MPa. The MFe content in the foundry ladle exceeds 90 percent, and the recovery rate of the iron element exceeds 95 percent. The zinc content in the zinc-rich powder bin exceeds 40 percent, and the recovery rate of zinc element exceeds 95 percent. The activity index of the modified slag in the modified slag bin exceeds 90 percent,meets the requirement of the activity index of the first-grade steel slag powder. The dust content of the discharged flue gas of the dust collecting system is lower than 10mg/m3。
The utility model discloses the advantage is that realize the high added value utilization of "hot" whole resources of sediment in the melting slag on the device and the method, the reduction modification adopts blast furnace ash as main reduction modifier simultaneously, and the addition is big, can reach slag, blast furnace ash and deal with in coordination, realizes the effect of treating waste with useless. The utility model discloses a process is simple, and it is high to equip degree of automation, and system processing cycle is short, and economic cost is reasonable, and the metal element rate of recovery such as product iron, zinc after handling is high, and modified sediment active index is high, compares the technique in the past and has apparent economic advantage. The process defines the direction for the resource utilization of two large difficult-to-treat solid wastes of the steel slag and the blast furnace ash of steel enterprises, and is expected to greatly promote the zero discharge of the steel slag and the blast furnace ash.
Drawings
FIG. 1 is a schematic view of a molten steel slag blast furnace ash reduction modification apparatus.
Detailed Description
A molten steel slag blast furnace ash reduction modification device is shown in figure 1, and comprises: the device comprises a blast furnace ash bin 1, a granulator 2, a blast furnace ash ball 3, a steel slag bag 4, a slag smelting furnace 5, a modified material bin 6, a feeder 7, a slag flushing tank 8, a water quenching tank 9, a high-pressure water gun 10, a modified slag bin 11, a foundry ladle 12, a dust collection system 13 and a zinc-rich powder bin 14. The blast furnace ash bin 1 is operatively connected with the granulator 2 and is used for uniformly feeding blast furnace ash in the blast furnace ash bin 1 into the granulator 2 for granulation to prepare blast furnace ash balls 3, the granulator 2 is operatively connected with the modification bin 6 and is used for feeding the blast furnace ash balls 3 into the modification bin 6, the modification bin 6 is arranged above the feeder 7, and the slag refining furnace 5 is arranged below the feeder 7 and is used for feeding modified materials including the blast furnace ash balls 3 into the slag refining furnace 5; the steel slag ladle 4 is operatively connected with the slag smelting furnace 5 and is used for pouring molten steel slag in the steel slag ladle 4 into the slag smelting furnace 5; the slag flushing groove 8 is arranged below the slag smelting furnace 5 and is used for pouring the modified slag on the upper part in the slag smelting furnace 5 into the slag flushing groove 8 for slag discharging operation; the ladle 12 is arranged below the slag smelting furnace 5 and used for pouring molten iron in the slag smelting furnace 5 into the ladle 12, the water quenching tank 9 is arranged on one side of the slag flushing groove 8 in the forward direction, and the high-pressure water gun 10 is arranged above the slag flushing groove 8 and used for pouring molten slag into the water quenching tank 9 along the slag flushing groove 8 under the impact force of the high-pressure water gun 10 so as to carry out rapid cooling to obtain modified slag; the dust collecting system 13 is partially connected above the slag smelting furnace 5 and is used for pumping away smoke generated in the smelting process of the slag smelting furnace 5. The modified slag obtained after water quenching in the water quenching tank 9 is transported to a modified slag bin 11 through a conveyor belt or an automobile; the dust collecting system 13 collects the obtained dust as zinc-rich powder, and transports the zinc-rich powder to the zinc-rich powder bin 14 by a conveyor belt or a vehicle.
Wherein, the granulator 2 is operatively connected with the modification bin 6 through a conveyor belt or an automobile, and is used for transporting the blast furnace ash balls manufactured by the granulator 2 to the modification bin 6 through the conveyor belt or the automobile. The dust collecting system 13 is provided with a gravity dust collector, a bag ash dust collector, a fan and a chimney; the gravity dust collector, the bag ash dust collector, the fan and the chimney are sequentially connected through pipelines, the dust collection system 13 starts negative pressure dust collection from the upper part of the slag smelting furnace 5, gravity settling dust collection is carried out through the gravity dust collector successively, then dust collection is carried out through the bag dust collector, then the dust is discharged through the fan and the chimney, and the fan provides a negative pressure condition through induced air to realize the discharge of flue gas.
Wherein, the blast furnace ash bin 1 adopts a closed bin, and the blast furnace ash bin 1, the modified slag bin 11 and the zinc-rich powder bin 14 are made of concrete or steel structures. Wherein, the granulator 2 is a disk granulator, the rotating speed is 5-30 r/min, and the inclination angle is 30-50 degrees. Wherein, the slag smelting furnace 5 is an electric arc smelting furnace, the highest smelting temperature can be provided to exceed 1800 ℃, and a refractory material is arranged in the slag smelting furnace 5. Wherein, the feeder 7 is a vibrating feeder, the vibration frequency is 800-1000 rpm, the inclination angle is 15-25 degrees, and the amplitude is 5-10 mm. Wherein, the depth of the slag flushing groove 8 is not less than 150mm, the width is not less than 200mm, the gradient is not less than 5%, and the interior is provided with refractory materials. Wherein, the water quenching tank 9 adopts a water tank with a concrete structure, the depth of the water quenching tank 9 is not less than 800mm, and the water temperature is not more than 85 ℃. Wherein, the high-pressure water gun 10 provides the highest water pressure not lower than 0.3 MPa. Wherein, the dust collecting system 13 is provided with a gravity dust collector, a bag ash dust collector, a fan and a chimney.
A method for reducing and modifying molten steel slag blast furnace ash is characterized by comprising the following steps: (1) the blast furnace dust is uniformly sent into a granulator 2 for granulation to prepare blast furnace dust balls 3 in a blast furnace dust bin 1, and the blast furnace dust balls 3 are naturally dried or baked and are conveyed to a modification bin 6 to provide a reduction modifier for a slag smelting furnace 5. (2) The feeder 7 firstly pours part of the blast furnace ash balls 3 and other modifiers in the modification bin 6 into the slag smelting furnace 5, then pours the molten steel slag in the steel slag bag 4 into the slag smelting furnace 5, and simultaneously pours the rest of the modifiers into the slag smelting furnace 5 together with the molten steel slag. (3) And starting the slag smelting furnace 5 to heat, reduce, modify and smelt, wherein smelting is continuously carried out until the first slag tapping time is met, iron oxides in the steel slag and the blast furnace ash enter molten iron through reduction and deposition, the slag and the molten iron are layered up and down in the slag smelting furnace 5, and the slag with the modified upper part is poured into a slag flushing groove 8 to carry out slag tapping operation. (4) The poured slag is poured into a water quenching tank 9 along a slag flushing groove 8 under the impulsive force of a high-pressure water gun 10, quenched to obtain modified slag, and collected into a modified slag bin 11. (5) And (3) after the primary slag discharging is finished, adding molten steel slag and a modifier into the slag smelting furnace 5 according to the step (3), smelting and discharging slag for a plurality of times, and pouring molten iron in the slag smelting furnace 5 into a foundry ladle 12 after the final slag discharging is finished. (6) In the production process of the slag smelting furnace 5, a dust collecting system 13 is adopted to treat the flue gas in the production process to obtain zinc-rich powder, and the zinc-rich powder is uniformly collected into a zinc-rich powder bin 14.
Wherein, granulator 2 preparation blast furnace ash ball 3 diameter 5 ~ 50mm, 3 moisture content of blast furnace ash ball after natural airing or stoving do not exceed 3%, and 2m drop intensity exceeds 6 times.
Wherein, the blast furnace ash ball 3 smelting material is mainly three materials of steel slag, blast furnace ash ball 3 and siliceous modifier, wherein, the addition amount of the blast furnace ash ball 3 accounts for 10 percent to 30 percent of the total materials, and the content of silicon oxide in the siliceous modifier exceeds 60 percent.
Wherein the smelting temperature of the slag smelting furnace 5 is 1500-1700 ℃, the slag tapping time for one-time smelting is 20-50 minutes, and the slag tapping is performed for 1-5 times in each smelting period.
Wherein, the slag tapping time of the slag refining furnace 5 is 2-10 minutes each time, the water supply amount of the high-pressure water gun 10 exceeds the slag tapping amount by 5 times to carry out slag flushing operation, and the water pressure is 0.1-0.25 MPa.
Wherein, the MFe content in the ladle 12 exceeds 90 percent, and the recovery rate of the iron element exceeds 95 percent.
Wherein, the zinc content in the zinc-rich powder bin 14 exceeds 40 percent, and the recovery rate of zinc element exceeds 95 percent.
Wherein, the activity index of the modified slag in the modified slag bin 11 exceeds 90 percent, and meets the requirement of the activity index of the first-grade steel slag powder.
Wherein the dust content of discharged flue gas is lower than 10mg/m3。
Claims (11)
1. The utility model provides a melting steel slag blast furnace ash reduction modification device which characterized in that, melting steel slag blast furnace ash reduction modification device includes: the device comprises a blast furnace ash bin (1), a granulator (2), a steel slag bag (4), a slag refining furnace (5), a modified material bin (6), a feeder (7), a slag flushing tank (8), a water quenching pool (9), a high-pressure water gun (10), a ladle (12) and a dust collecting system (13); the blast furnace ash bin (1) is operatively connected with the granulator (2) and is used for uniformly feeding blast furnace ash in the blast furnace ash bin (1) into the granulator (2) for granulation to prepare blast furnace ash balls (3), the granulator (2) is operatively connected with the modification bin (6) and is used for feeding the blast furnace ash balls (3) into the modification bin (6), the modification bin (6) is arranged above the feeding machine (7), and the slag smelting furnace (5) is arranged below the feeding machine (7) and is used for feeding modified materials comprising the blast furnace ash balls (3) into the slag smelting furnace (5); the steel slag ladle (4) is operably connected with the slag smelting furnace (5) and is used for pouring molten steel slag in the steel slag ladle (4) into the slag smelting furnace (5); the slag flushing groove (8) is arranged below the slag smelting furnace (5) and is used for pouring the modified slag on the upper part in the slag smelting furnace (5) into the slag flushing groove (8) for slag discharging operation; the ladle (12) is arranged below the slag smelting furnace (5) and used for pouring molten iron in the slag smelting furnace (5) into the ladle (12), the water quenching tank (9) is arranged on one side of the slag flushing tank (8) in the forward direction, and the high-pressure water gun (10) is arranged above the slag flushing tank (8) and used for pouring molten slag into the water quenching tank (9) along the slag flushing tank (8) under the impact force of the high-pressure water gun (10) to carry out quenching so as to obtain modified slag; the dust collecting system (13) is connected with the slag smelting furnace (5) and is used for pumping away smoke generated in the smelting process of the slag smelting furnace (5).
2. The molten steel slag blast furnace ash reduction modification device according to claim 1, further comprising: a modified slag bin (11) and a zinc-rich powder bin (14); the modified slag obtained after water quenching in the water quenching tank (9) is transported to a modified slag bin (11) through a conveyor belt or an automobile; the dust collecting system (13) collects the obtained dust to be rich zinc powder, and the dust is transported to a zinc powder rich bin (14) through a conveyor belt or an automobile.
3. The molten steel slag blast furnace ash reduction modification apparatus as claimed in any one of claims 1 to 2, wherein the granulator (2) is operatively connected to the modification silo (6) via a conveyor belt or a vehicle for transporting the blast furnace ash balls produced by the granulator (2) to the modification silo (6) via the conveyor belt or the vehicle.
4. The reduction modification device for the molten steel slag blast furnace ash according to claim 3, characterized in that the blast furnace ash bin (1) adopts a closed bin, and the blast furnace ash bin (1), the modified slag bin (11) and the zinc-rich powder bin (14) are made of concrete or steel.
5. The reduction modification device for the molten steel slag blast furnace ash according to one of the claims 1 to 2, wherein the granulator (2) is a disk granulator, the rotating speed is 5-30 r/min, and the inclination angle is 30-50 degrees.
6. The reduction and modification device for molten steel slag and blast furnace ash according to any one of claims 1 to 2, wherein the slag melting furnace (5) is an electric arc furnace, which can provide a maximum melting temperature of more than 1800 ℃, and refractory materials are arranged in the slag melting furnace (5).
7. The reduction modification device for the molten steel slag blast furnace ash according to one of claims 1 to 2, wherein the feeder (7) is a vibrating feeder, the vibration frequency is 800-1000 r/min, the inclination angle is 15-25 degrees, and the amplitude is 5-10 mm.
8. The apparatus for reductive modification of molten steel slag blast furnace ash according to any one of claims 1 to 2 wherein said sluicing bath (8) has a depth of not less than 150mm and a width of not less than 200mm and is provided with a refractory material inside.
9. The molten steel slag blast furnace ash reduction modification device according to any one of claims 1 to 2, wherein the water quenching tank (9) is a water tank of a concrete structure, the depth of the water quenching tank (9) is not less than 800mm, and the temperature of water is not more than 85 ℃.
10. The molten steel slag blast furnace ash reduction modification apparatus as claimed in any one of claims 1 to 2, wherein the high pressure water gun (10) provides a maximum water pressure of not less than 0.3 MPa.
11. The molten steel slag blast furnace ash reduction modification apparatus according to any one of claims 1 to 2, wherein the dust collection system (13) has a gravity dust collector, a bag ash dust collector, a fan and a chimney; the gravity dust collector, the bag ash dust collector, the fan and the chimney are connected in sequence through pipelines.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111850189A (en) * | 2020-08-04 | 2020-10-30 | 中冶节能环保有限责任公司 | Molten steel slag blast furnace ash reduction modification device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111850189A (en) * | 2020-08-04 | 2020-10-30 | 中冶节能环保有限责任公司 | Molten steel slag blast furnace ash reduction modification device and method |
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