Blast furnace ash pyrogenic process smelting slag cooling system and method

Abstract

A blast furnace ash pyrogenic process smelting slag cooling system comprises a water cooling unit and a salt cooling unit. The water cooling unit comprises a feeding channel and a water cooling bin. The feeding channel is obliquely arranged, a discharging port in the lower end of the feeding channel is communicated with a feeding port in the upper end of the water cooling bin, and an opening in the upper end of the feeding channel is a slag inlet. The salt cooling unit comprises a storage hopper and a salt cooling bin. The storage hopper is arranged at a feeding hole in the upper end of the salt cooling bin, and an opening in the upper end of the storage hopper is positioned below the lower side wall of the feeding channel. And the lower side wall of the feeding channel corresponding to the opening in the upper end of the storage hopper is of a sieve plate structure. The bottoms of the water cooling bin and the salt cooling bin are each provided with a slag discharging opening. According to the characteristics of the furnace slag, the sieve plate and the air chamber are used for classification to obtain the furnace slag with three different particle sizes, and the furnace slag with the three different particle sizes is cooled in water cooling, salt cooling and air cooling modes respectively, so that the cooling efficiency is improved, and efficient and comprehensive treatment of the blast furnace cloth bag ash is facilitated.

Description

Technical Field

[0001] The invention relates to a cooling system and method, and particularly to a blast furnace ash pyrometallurgical slag cooling system and method, belonging to the technical field of collaborative treatment of metallurgical solid wastes. Background Art

[0002] The blast furnace bag dust (also known as blast furnace bag ash) in a steel plant contains a relatively high amount of alkali and chlorine metals and cannot be directly returned to the system for consumption. Generally, the removal of alkali and chlorine metals is carried out by means of water washing, and the wastewater is disposed of and the crystal salt is recovered by evaporation crystallization after treatment. The process of evaporating and crystallizing salt is actually a process of continuous concentration of the solution. This is because in the leaching solution, in addition to containing chloride salts, there are also ions such as sulfate ions and nitrate ions. These ions will cause cyclic enrichment as the solution is continuously concentrated. In order to avoid the influence of the mother liquor on the crystal salt, it is usually disposed of by direct external discharge. However, directly discharging the mother liquor will cause secondary pollution and affect the environment. At the same time, at present, the blast furnace bag ash is generally treated by an independent water washing and resource utilization method. The chlorine content in the blast furnace bag ash is generally 4-10%, and its amount is generally 3 times that of sintering ash. If directly washed for dechlorination, the equipment is large and the water consumption is large, and the wastewater after water washing contains a large amount of alkali metal, chloride salt and other ions, making the wastewater treatment difficult. The blast furnace bag ash and sintering machine head ash produced by the steel plant are both high-chlorine solid wastes and both need to be washed for dechlorination treatment. Co-disposing them is a better way to reduce investment and operation. However, the existing methods only simply mix the blast furnace bag ash and sintering machine head ash for disposal without considering the characteristics of solid waste and material treatment.

[0003] Since the direct water washing and dechlorination of blast furnace bag ash consumes a large amount of water and the wastewater treatment is difficult, and enriching the blast furnace bag ash by pyrometallurgy is a more suitable process. During the pyrometallurgical process of blast furnace ash, due to temperature fluctuations, high-temperature molten agglomeration will occur, forming large-sized slag containing a large amount of large particles. Ordinary air cooling or indirect cooling cannot achieve particle crushing, resulting in problems such as insufficient cooling and low cooling efficiency. At the same time, during subsequent utilization, the large particles need to be broken into small particles, which affects the process efficiency and is not conducive to the full utilization of the slag. In addition, the slag enriched by pyrometallurgy also contains some small particles and fine particles of slag. If these small particles and fine particles of slag are both cooled by water cooling, the fine particles of slag are easily directly discharged with the cooling water, resulting in a reduction in the recovery rate of the slag. At the same time, it will also pollute the water body and affect the subsequent process. And adding a filtration step will greatly reduce the cooling efficiency, which is not conducive to the efficient and comprehensive disposal of blast furnace ash and the high-value utilization of high-salt solid wastes generated in steel production.

[0004] In addition, at present, the utilization of blast furnace bag ash is not sufficient, and the slag of different particle sizes is not classified, so that the functions of various ions in the blast furnace bag ash cannot be fully exerted. Therefore, a system and method that can fully utilize blast furnace bag ash are needed. Summary of the Invention

[0005] In view of the problems in the prior art that when directly washing and dechlorinating the blast furnace bag dust with water, the water consumption is large and the wastewater treatment is difficult, while using pyrometallurgical enrichment of the blast furnace bag dust leads to the slag not being classified by particle size, resulting in large particle slag being difficult to break, insufficient cooling, low cooling efficiency, etc. At the same time, small particle slag and fine particle slag are easily discharged with the cooling water, resulting in a low recovery rate of the slag, which is not conducive to the efficient and comprehensive disposal of blast furnace ash and the high-value utilization of high-salt solid waste.

[0006] According to the first embodiment of the present invention, a slag cooling system for pyrometallurgical smelting of blast furnace ash is provided.

[0007] A slag cooling system for pyrometallurgical smelting of blast furnace ash, the device includes a water cooling unit and a salt cooling unit. The water cooling unit includes a feed channel and a water cooling bin. The feed channel is inclined, and the lower discharge port of the feed channel is communicated with the upper feed port of the water cooling bin, and the upper opening of the feed channel is the slag inlet. The salt cooling unit includes a storage hopper and a salt cooling bin. The storage hopper is arranged at the upper feed port of the salt cooling bin, and the upper opening of the storage hopper is located below the lower side wall of the feed channel. The lower side wall of the feed channel corresponding to the upper opening of the storage hopper is a sieve plate structure. Discharge ports are provided at the bottoms of both the water cooling bin and the salt cooling bin.

[0008] Preferably, the water cooling unit further includes a screw slag discharger. The screw slag discharger is arranged at the discharge port at the bottom of the water cooling bin and is communicated with the discharge port. Preferably, the screw slag discharger is of an inclined design with the discharge end higher than the feed end, and its feed end is communicated with the discharge port at the bottom of the water cooling bin.

[0009] Preferably, a water inlet is further provided on the side wall of the water cooling bin.

[0010] Preferably, the sieve hole diameter of the sieve plate structure on the lower side wall of the feed channel is 15 - 25 mm, preferably 18 - 22 mm.

[0011] Preferably, the upper part of the side wall of the salt cooling bin is a vertical surface, and the lower part of the side wall is an inclined surface that gradually narrows inward.

[0012] Preferably, the side wall of the salt cooling bin is an inclined surface that gradually narrows inward from top to bottom.

[0013] Preferably, the inclined surface part of the side wall of the salt cooling bin is arranged in a stepped manner, and a high-salt liquid inlet is provided at each step, and a high-salt liquid nozzle is provided at the high-salt liquid inlet. Preferably, a total of 3 - 7 steps are provided on the side wall of the salt cooling bin.

[0014] Preferably, the cross-section of the salt cooling bin is one of a circle, an ellipse, and a rectangle.

[0015] Preferably, the salt cooling unit further includes a discharging device. The discharging device is arranged at the lower discharging port of the storage hopper.

[0016] Preferably, the salt cooling unit further includes a slag liquid transfer pump. The slag liquid transfer pump is arranged at the bottom slag discharging port of the salt cooling bin.

[0017] Preferably, the device further includes an air cooling unit. The air cooling unit includes an air chamber, a primary fine particle recovery bin, an air cooling bin, a blast blower, a blast air duct, a cooling air duct and an exhaust duct. The air chamber is arranged on the side wall of the salt cooling bin, and a primary air inlet and a primary air outlet are arranged on the air chamber. The blast air duct is communicated with the primary air inlet. The primary air outlet is located below the lower discharging port of the storage hopper. The primary fine particle recovery bin is a cylindrical structure with upper and lower openings. The upper opening of the primary fine particle recovery bin is arranged in front of the primary air outlet and is located on the falling path of the fine particle slag. The lower end of the primary fine particle recovery bin is communicated with the air cooling bin. The air cooling bin is communicated with the blast blower through the cooling air duct. A fine particle slag outlet is arranged at the lower end of the air cooling bin, and an exhaust port is arranged on the side wall of the air cooling bin. The exhaust duct is arranged above the air cooling unit.

[0018] Preferably, the air cooling unit further includes an inclined hopper. The upper part of the inclined hopper is a cuboid structure, and the lower part is a fan-shaped structure. A secondary air inlet corresponding to the primary air outlet is arranged on the side wall of the upper part of the inclined hopper. The lower end of the inclined hopper is communicated with the upper opening of the primary fine particle recovery bin.

[0019] Preferably, the air cooling unit further includes a secondary fine particle recovery device. The secondary fine particle recovery device is arranged in parallel with the primary fine particle recovery bin and is located on the side of the primary fine particle recovery bin away from the air chamber. The upper part of the secondary fine particle recovery device is an open structure and is communicated with the inclined hopper. The exhaust duct is arranged above the secondary fine particle recovery device. Preferably, the secondary fine particle recovery device is a cyclone separation device or a multi-tube dust removal device.

[0020] Preferably, a primary air isolation discharging valve is arranged at the lower end of the primary fine particle recovery bin.

[0021] Preferably, a secondary air isolation discharging valve is arranged at the lower end of the secondary fine particle recovery device.

[0022] Preferably, a tertiary air isolation discharging valve is arranged at the fine particle slag outlet of the air cooling bin.

[0023] Preferably, the cooling air duct is arranged around the outer side wall of the air cooling bin, and annular ventilation holes are correspondingly arranged on the air cooling bin.

[0024] Preferably, the air cooling unit further includes a cooling air cap. The cooling air cap is arranged inside the air cooling bin and is communicated with the cooling air duct. Preferably, the height of the cooling air cap is lower than that of the ventilation hole.

[0025] Preferably, the exhaust port of the air-cooled bin is communicated with the air supply duct. Preferably, a high-temperature fan is provided on the air supply duct.

[0026] Preferably, a screen is provided in the exhaust duct.

[0027] According to the second embodiment of the present invention, a method for cooling slag from the pyrometallurgical smelting of blast furnace ash is provided.

[0028] A method for cooling slag from the pyrometallurgical smelting of blast furnace ash, the method comprising:

[0029] 1) The slag enters the blast furnace ash pyrometallurgical smelting slag cooling system from the slag inlet at the upper end of the feed channel. The large-particle slag rolls along the lower side wall of the feed channel to the water-cooled bin, and the small-particle slag falls into the storage hopper of the salt-cooling unit.

[0030] 2) After being cooled in the water-cooled bin, the large-particle slag is discharged from the slag discharge port at the bottom of the water-cooled bin. After being cooled in the salt-cooled bin, the small-particle slag is discharged from the slag discharge port at the bottom of the salt-cooled bin together with the liquid in the salt-cooled bin.

[0031] Preferably, the method further comprises: 3) Inputting gas into the air supply duct. The airflow ejected from the primary air outlet separates the fine-particle slag in the small-particle slag and blows it into the air-cooling unit. Part of the fine-particle slag enters the primary fine-particle recovery bin through the inclined hopper, and the other part of the slag enters the secondary fine-particle recovery device. The fine-particle slag enters the air-cooled bin from the primary fine-particle recovery bin and the secondary fine-particle recovery device, and after being cooled in the air-cooled bin, it is discharged from the fine-particle slag outlet at the lower end of the air-cooled bin.

[0032] Preferably, the air supply duct is communicated with the exhaust port of the air-cooled bin. Gas is sent into the cooling air duct. The gas enters the air supply duct from the exhaust port after passing through the air-cooled bin, and then separates the fine-particle slag in the small-particle slag and blows the fine-particle slag into the air-cooling unit for cooling.

[0033] Preferably, the method further comprises: 4) Introducing the hot air discharged from the exhaust duct into the waste heat power generation or steam crystallization process.

[0034] In the present invention, by using the stepped particle size classification and multi-mode cooling technology, first, the slag generated from the pyrometallurgical smelting of blast furnace ash is classified by screening. A sieve plate is provided below the slag inlet to separate the large-particle slag from the small-particle slag, completing the primary classification of the slag. The separated large-particle slag directly enters the water-cooled bin, and while being water-cooled, particle decomposition is achieved, while the small-particle slag enters the salt-cooling unit and is cooled in the high-salt solution, and is discharged after cooling.

[0035] In the present invention, a high-salt liquid inlet is provided on the side wall of the salt cooling bin for replenishing the liquid in the salt cooling bin. The side wall or the lower part of the side wall of the salt cooling bin is an inclined surface that narrows inward. The inclined surface is arranged in a stepped structure, and high-salt liquid inlets are provided at each step. High-salt liquid nozzles are provided at the high-salt liquid inlets. The high-salt solution is ejected from the nozzles at high speed. While replenishing the brine, the high-speed fluid is used to stir the liquid in the salt cooling bin, prevent particle deposition, and improve the cooling efficiency at the same time. Preferably, 3 to 5 stepped structures are provided on the side wall of the salt cooling bin, and high-speed high-salt solution is ejected at different positions in the salt cooling bin to accelerate the liquid flow in the salt cooling bin and improve the cooling efficiency.

[0036] In the present invention, a discharger is provided at the lower end of the storage hopper of the salt cooling unit to control the amount of small-particle slag in the salt cooling bin, and avoid excessive small-particle slag in the salt cooling bin, which may lead to insufficient cooling in the salt cooling bin. By controlling the discharger, the quality of the small-particle slag in the salt cooling bin is kept within the optimal range.

[0037] In the present invention, in order to further sufficiently cool the slag and improve the utilization rate of the slag, an air cooling unit is provided on one side of the salt cooling unit, a wind chamber is provided below the small-particle feed inlet, and gas is introduced into the wind chamber from the air supply pipeline. When the small-particle slag falls from the sieve holes of the sieve plate to the front of the wind chamber, the fine-particle slag in the small-particle slag is carried out by the airflow ejected from the wind chamber and enters the primary fine-particle recovery bin located in front of the wind chamber, realizing the secondary classification of the small-particle slag to obtain the fine-particle slag. Preferably, an inclined hopper is provided in front of the wind chamber, and a secondary air inlet corresponding to the primary air outlet is opened on the inclined hopper. The airflow ejected from the wind chamber enters the inclined hopper from the secondary air inlet after separating the fine-particle slag. Since the space of the inclined hopper is relatively large, the flow velocity of the airflow decreases after entering the inclined hopper, and the fine-particle slag falls and flows into the primary fine-particle recovery bin along the inclined hopper. Preferably, a two-stage fine-particle recovery device is adopted to better separate the particles from the airflow. First, the wind speed is reduced through a flared opening to settle part of the particles, reducing the particle content in the airflow, which is beneficial to the gas-solid separation of finer particles in the secondary recovery device. In the present invention, a secondary fine-particle recovery device is provided on the side of the primary fine-particle recovery bin away from the inclined hopper. The airflow continues to flow forward after passing through the primary fine-particle recovery bin, and at the same time, the flow velocity further decreases. The fine-particle slag in the airflow falls into the secondary fine-particle recovery device, and the secondary fine-particle recovery device is used to separate the airflow and the fine-particle slag. Preferably, a sieve mesh is provided in the exhaust duct, and the fine-particle slag is intercepted by the sieve mesh and falls into the secondary fine-particle recovery device to prevent the fine-particle slag from being discharged with the airflow and improve the recovery rate of the slag.

[0038] In the present invention, the fine-grained slag falls into the air-cooling bin after passing through the primary fine-grained recycling bin and the secondary fine-grained recycler. The blast fan introduces cold air from the outside. The cold air enters the air-cooling bin after passing through the cooling air duct and completes the cooling of the fine-grained slag in the air-cooling bin. Preferably, annular ventilation holes are provided around the air-cooling bin to accelerate the cooling rate of the fine-grained slag in the air-cooling bin. Preferably, cooling air caps are arranged in the air-cooling bin to evenly distribute the air flow in the center and around the air-cooling bin, prevent the generation of cooling dead zones, and improve the cooling efficiency.

[0039] In the present invention, a primary air-separating discharge valve is provided at the bottom of the primary fine-grained recycling bin, and / or a secondary air-separating discharge valve is provided at the bottom of the secondary fine-grained recycler to control the quality of the fine-grained slag in the air-cooling bin.

[0040] In the present invention, in order to make full use of the hot air generated in the air-cooling bin, an air flow unit is provided to transport the hot air in the air-cooling bin to the air chamber. The hot air performs secondary classification on the fine-grained slag at the small-particle feed inlet and then enters the air-cooling unit and is discharged from the exhaust air pipe. Preferably, since the hot air discharged from the exhaust air pipe passes through the air-cooling bin and contacts the fine-grained slag, it forms high-temperature gas after two heat exchanges and can be used in processes such as waste heat power generation and evaporation crystallization to achieve the full utilization of waste heat.

[0041] In the present invention, the diameter of the sieve holes of the sieve plate is set to be 15 - 25 mm, preferably 18 - 22 mm, as the boundary line between the large-grained slag and the small-grained slag. In addition, the air flow intensity ejected from the air chamber is controlled to separate the fine-grained slag with a particle size of less than 3 mm from the small-grained slag, realizing the stepped particle size classification of the slag.

[0042] In the present invention, the small-grained slag is classified and cooled by using this system. The cooled slag can be co-disposed with the sintering machine head ash to complete the resource recovery of copper and the disposal of nitrate and sulfate. The slag obtains a slag-containing mixed solution after salt cooling, and the fine-grained slag obtains cold slag after air cooling. A copper-rich solution will be obtained during the water washing process of the sintering machine head ash. Introducing ammonia nitrogen into the system can strengthen the dissolution of copper. Then, by using the characteristic that the dry kiln slag obtained during the pyrometallurgical treatment of the blast furnace bag filter ash contains a large amount of elemental iron, after air-cooling separation, cold slag containing elemental iron is obtained. Adding the cold slag to the copper-rich solution will cause the reaction of iron displacing copper to recover elemental copper and achieve the recovery of copper resources. In addition, since there is nitrate in the mother liquor of the water washing of the sintering machine head ash and the slag contains iron, nitrate can react with elemental iron under acidic conditions to be reduced. Nitrate is reduced to ammonia nitrogen by elemental iron, and mainly reacts with elemental iron to reduce nitrate to nitrogen in weakly acidic and neutral conditions. Ammonia nitrogen can strengthen the precipitation of copper ions in the sintering ash. In summary, after the slag is classified and cooled by using this system, the co-disposal of the slag and the sintering machine head ash can be realized, and the high-value utilization of solid waste can be completed.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. A blast furnace ash pyrometallurgical slag cooling system provided by the present invention classifies according to the characteristics of the slag by using a sieve plate, cools large-particle slag and small-particle slag separately, and also provides an air-cooling unit to conduct secondary classification on the slag to obtain three kinds of slag with different particle sizes, and cools the three kinds of slag with different particle sizes by means of water cooling, salt cooling and air cooling respectively, improving the cooling efficiency, which is beneficial to the efficient and comprehensive disposal of blast furnace bag dust and the high-value utilization of high-salt solid waste.

[0045] 2. A blast furnace ash pyrometallurgical slag cooling method provided by the present invention realizes the efficient cooling of the slag through the device, improves the cooling process of the slag, and can change the standard of slag particle size classification by changing the sieve hole diameter of the sieve plate on the lower side wall of the feed channel and the air flow velocity ejected from the air chamber, which has strong practicability and is beneficial to the high-value utilization of high-salt solid waste in iron and steel production. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The front view of a blast furnace ash pyrometallurgical slag cooling system provided by the present invention;

[0047] Figure 2 The side view of a blast furnace ash pyrometallurgical slag cooling system provided by the present invention;

[0048] Figure 3 The sectional view taken along line A-A of a blast furnace ash pyrometallurgical slag cooling system provided by the present invention;

[0049] Figure 4 The sectional view taken along line B-B of a blast furnace ash pyrometallurgical slag cooling system provided by the present invention;

[0050] Reference numerals: 1: water-cooling unit; 101: feed channel; 102: water-cooling bin; 103: screw slag discharger; 104: water inlet; 2: salt-cooling unit; 201: storage hopper; 202: salt-cooling bin; 203: high-salt liquid nozzle; 204: discharger; 205: slag liquid transfer pump; 3: air-cooling unit; 301: air chamber; 3011: primary air inlet; 3012: primary air outlet; 302: primary fine particle recovery bin; 303: air-cooling bin; 304: blast blower; 305: air supply pipeline; 306: cooling air duct; 307: exhaust duct; 308: inclined hopper; 3081: secondary air inlet; 309: secondary fine particle recovery device; 310: primary airtight discharge valve; 311: secondary airtight discharge valve; 312: tertiary airtight discharge valve; 313: ventilation hole; 314: cooling air cap; 315: high-temperature blower. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The technical solution of the present invention will be illustrated by way of example below. The scope of protection claimed by the present invention includes but is not limited to the following embodiments.

[0052] According to the first embodiment of the present invention, a slag cooling system for pyrometallurgy of blast furnace ash is provided.

[0053] A slag cooling system for pyrometallurgy of blast furnace ash, the device includes a water cooling unit 1 and a salt cooling unit 2. The water cooling unit 1 includes a feed channel 101 and a water cooling bin 102. The feed channel 101 is inclined, and the lower discharge port of the feed channel 101 is communicated with the upper feed port of the water cooling bin 102. The upper opening of the feed channel 101 is the slag inlet. The salt cooling unit 2 includes a storage hopper 201 and a salt cooling bin 202. The storage hopper 201 is arranged at the upper feed port of the salt cooling bin 202, and the upper opening of the storage hopper 201 is located below the lower side wall of the feed channel 101. The lower side wall of the feed channel 101 corresponding to the upper opening of the storage hopper 201 is a sieve plate structure. The bottoms of both the water cooling bin 102 and the salt cooling bin 202 are provided with slag discharge ports.

[0054] Preferably, the water cooling unit 1 further includes a screw slag discharger 103. The screw slag discharger 103 is arranged at the slag discharge port at the bottom of the water cooling bin 102 and is communicated with the slag discharge port. Preferably, the screw slag discharger 103 is of an inclined design with the discharge end higher than the feed end, and its feed end is communicated with the slag discharge port at the bottom of the water cooling bin 102.

[0055] Preferably, a water adding port 104 is further provided on the side wall of the water cooling bin 102.

[0056] Preferably, the sieve hole diameter of the sieve plate structure on the lower side wall of the feed channel 101 is 15 - 25 mm, preferably 18 - 22 mm.

[0057] Preferably, the upper part of the side wall of the salt cooling bin 202 is a vertical surface, and the lower part of the side wall is an inclined surface that gradually narrows inward.

[0058] Preferably, the side wall of the salt cooling bin 202 is an inclined surface that gradually narrows inward from top to bottom.

[0059] Preferably, the inclined surface part of the side wall of the salt cooling bin 202 is arranged in a stepped manner, and a high-salt liquid inlet is provided at each step. A high-salt liquid nozzle 203 is provided at the high-salt liquid inlet. Preferably, a total of 3 - 7 steps are provided on the side wall of the salt cooling bin 202.

[0060] Preferably, the cross-section of the salt cooling bin 202 is one of a circle, an ellipse, and a rectangle.

[0061] Preferably, the salt cooling unit 2 further includes a discharger 204. The discharger 204 is arranged at the lower discharge port of the storage hopper 201.

[0062] Preferably, the salt cooling unit 2 further includes a slag liquid transfer pump 205. The slag liquid transfer pump 205 is arranged at the bottom slag discharge port of the salt cooling bin 202.

[0063] Preferably, the device further includes an air cooling unit 3. The air cooling unit 3 includes an air chamber 301, a primary fine particle recovery bin 302, an air cooling bin 303, a blast fan 304, a blast air duct 305, a cooling air duct 306, and an exhaust air duct 307. The air chamber 301 is arranged on the side wall of the salt cooling bin 202. The air chamber 301 is provided with a primary air inlet 3011 and a primary air outlet 3012. The blast air duct 305 is communicated with the primary air inlet 3011. The primary air outlet 3012 is located below the lower discharge port of the storage hopper 201. The primary fine particle recovery bin 302 is a cylindrical structure with upper and lower openings. The upper opening of the primary fine particle recovery bin 302 is arranged in front of the primary air outlet 3012 and is located on the falling path of the fine particle slag. The lower end of the primary fine particle recovery bin 302 is communicated with the air cooling bin 303. The air cooling bin 303 is communicated with the blast fan 304 through the cooling air duct 306. The lower end of the air cooling bin 303 is provided with a fine particle slag outlet, and the side wall of the air cooling bin 303 is provided with an exhaust port. The exhaust air duct 307 is arranged above the air cooling unit 3.

[0064] Preferably, the air cooling unit 3 further includes an inclined hopper 308. The upper part of the inclined hopper 308 is a cuboid structure, and the lower part is a fan-shaped structure. The side wall of the upper part of the inclined hopper 308 is provided with a secondary air inlet 3081 corresponding to the primary air outlet 3012. The lower end of the inclined hopper 308 is communicated with the upper opening of the primary fine particle recovery bin 302.

[0065] Preferably, the air cooling unit 3 further includes a secondary fine particle recovery device 309. The secondary fine particle recovery device 309 is arranged in parallel with the primary fine particle recovery bin 302 and is located on the side of the primary fine particle recovery bin 302 away from the air chamber 301. The upper part of the secondary fine particle recovery device 309 is an open structure and is communicated with the inclined hopper 308. The exhaust air duct 307 is arranged above the secondary fine particle recovery device 309. Preferably, the secondary fine particle recovery device 309 is a cyclone separation device or a multi-tube dust removal device.

[0066] Preferably, the lower end of the primary fine particle recovery bin 302 is provided with a primary air isolation discharge valve 310.

[0067] Preferably, the lower end of the secondary fine particle recovery device 309 is provided with a secondary air isolation discharge valve 311.

[0068] Preferably, a tertiary air isolation discharge valve 312 is arranged at the fine particle slag outlet of the air cooling bin 303.

[0069] Preferably, the cooling air duct 306 is disposed around the outer wall of the air-cooling bin 303, and an annular ventilation hole 313 is correspondingly formed in the air-cooling bin 303.

[0070] Preferably, the air-cooling unit 3 further includes a cooling air cap 314. The cooling air cap 314 is disposed inside the air-cooling bin 303 and is communicated with the cooling air duct 306. Preferably, the height of the cooling air cap 314 is lower than that of the ventilation hole 313.

[0071] Preferably, the exhaust port of the air-cooling bin 303 is communicated with the air supply duct 305. Preferably, a high-temperature blower 315 is disposed on the air supply duct 305.

[0072] Preferably, a screen is disposed in the exhaust duct 307.

[0073] According to the second embodiment of the present invention, a method for cooling blast furnace ash pyrometallurgical slag is provided.

[0074] A method for cooling blast furnace ash pyrometallurgical slag, the method comprising:

[0075] 1) The slag enters the blast furnace ash pyrometallurgical slag cooling system from the slag inlet at the upper end of the feed channel 101. The large-particle slag rolls along the lower side wall of the feed channel 101 to the water-cooling bin 102, and the small-particle slag falls into the storage hopper 201 of the salt-cooling unit.

[0076] 2) After being cooled in the water-cooling bin, the large-particle slag is discharged from the slag discharge port at the bottom of the water-cooling bin. After being cooled in the salt-cooling bin 202, the small-particle slag is discharged from the slag discharge port at the bottom of the salt-cooling bin 202 together with the liquid in the salt-cooling bin 202.

[0077] Preferably, the method further includes: 3) Inputting gas into the air supply duct 305. The air flow ejected from the primary air outlet 3012 separates the fine-particle slag in the small-particle slag and blows it into the air-cooling unit 3. Part of the fine-particle slag enters the primary fine-particle recovery bin 302 through the inclined hopper 308, and the other part of the slag enters the secondary fine-particle recovery device 309. The fine-particle slag enters the air-cooling bin from the primary fine-particle recovery bin 302 and the secondary fine-particle recovery device 309, and after being cooled in the air-cooling bin, is discharged from the fine-particle slag outlet at the lower end of the air-cooling bin 303.

[0078] Preferably, the air supply duct 305 is communicated with the exhaust port of the air-cooling bin 303. Gas is sent into the cooling air duct 306. The gas passes through the air-cooling bin 303 and then enters the air supply duct 305 from the exhaust port, and then separates the fine-particle slag in the small-particle slag and blows the fine-particle slag into the air-cooling unit 3 for cooling.

[0079] Preferably, the method further includes: 4) Introducing the hot air discharged from the exhaust duct 307 into a waste heat power generation or steam crystallization process.

[0080] Example 1

[0081] A slag cooling system for pyrometallurgy of blast furnace ash. The device includes a water cooling unit 1 and a salt cooling unit 2. The water cooling unit 1 includes a feed channel 101 and a water cooling bin 102. The feed channel 101 is inclined, and the lower discharge port of the feed channel 101 is communicated with the upper feed port of the water cooling bin 102. The upper opening of the feed channel 101 is the slag inlet. The salt cooling unit 2 includes a storage hopper 201 and a salt cooling bin 202. The storage hopper 201 is arranged at the upper feed port of the salt cooling bin 202, and the upper opening of the storage hopper 201 is located below the lower side wall of the feed channel 101. The lower side wall of the feed channel 101 corresponding to the upper opening of the storage hopper 201 is a sieve plate structure. Discharge ports are provided at the bottoms of both the water cooling bin 102 and the salt cooling bin 202.

[0082] Example 2

[0083] Repeat Example 1, except that the water cooling unit 1 further includes a screw slag discharger 103. The screw slag discharger 103 is arranged at the discharge port at the bottom of the water cooling bin 102 and is communicated with the discharge port. The screw slag discharger 103 is of an inclined design with its discharge end higher than its feed end, and its feed end is communicated with the discharge port at the bottom of the water cooling bin 102.

[0084] A water filling port 104 is further provided on the side wall of the water cooling bin 102.

[0085] The diameter of the sieve holes of the sieve plate structure on the lower side wall of the feed channel 101 is 20 mm.

[0086] Example 3

[0087] Repeat Example 2, except that the upper part of the side wall of the salt cooling bin 202 is a vertical surface and the lower part of the side wall is an inclined surface that gradually narrows inward.

[0088] The inclined surface part of the side wall of the salt cooling bin 202 is arranged in a stepped manner, and a high-salt liquid inlet is provided at each step. A high-salt liquid nozzle 203 is provided at the high-salt liquid inlet. There are a total of 5 steps on the side wall of the salt cooling bin 202.

[0089] The cross-section of the salt cooling bin 202 is circular.

[0090] Example 4

[0091] Repeat Example 3, except that the salt cooling unit 2 further includes a discharger 204. The discharger 204 is arranged at the lower discharge port of the storage hopper 201.

[0092] The salt cooling unit 2 further includes a slag liquid transfer pump 205. The slag liquid transfer pump 205 is arranged at the discharge port at the bottom of the salt cooling bin 202.

[0093] Example 5

[0094] Repeat Example 4, except that the device further includes an air-cooling unit 3. The air-cooling unit 3 includes an air chamber 301, a primary fine particle recovery bin 302, an air-cooling bin 303, a blast fan 304, a supply air duct 305, a cooling air duct 306, and an exhaust duct 307. The air chamber 301 is provided on the side wall of the salt-cooling bin 202. The air chamber 301 is provided with a primary air inlet 3011 and a primary air outlet 3012. The supply air duct 305 is communicated with the primary air inlet 3011. The primary air outlet 3012 is located below the discharge port at the lower end of the storage hopper 201. The primary fine particle recovery bin 302 is a cylindrical structure with upper and lower openings. The upper opening of the primary fine particle recovery bin 302 is provided in front of the primary air outlet 3012 and is located on the falling path of the fine particle slag. The lower end of the primary fine particle recovery bin 302 is communicated with the air-cooling bin 303. The air-cooling bin 303 is communicated with the blast fan 304 through the cooling air duct 306. The lower end of the air-cooling bin 303 is provided with a fine particle slag outlet, and the side wall of the air-cooling bin 303 is provided with an exhaust port. The exhaust duct 307 is provided above the air-cooling unit 3.

[0095] The air-cooling unit 3 further includes an inclined hopper 308. The upper part of the inclined hopper 308 is a cuboid structure, and the lower part is a fan-shaped structure. The side wall of the upper part of the inclined hopper 308 is provided with a secondary air inlet 3081 corresponding to the primary air outlet 3012. The lower end of the inclined hopper 308 is communicated with the upper opening of the primary fine particle recovery bin 302.

[0096] Example 6

[0097] Repeat Example 5, except that the air-cooling unit 3 further includes a secondary fine particle recovery device 309. The secondary fine particle recovery device 309 is arranged in parallel with the primary fine particle recovery bin 302 and is located on the side of the primary fine particle recovery bin 302 away from the air chamber 301. The upper part of the secondary fine particle recovery device 309 is an open structure and is communicated with the inclined hopper 308. The exhaust duct 307 is provided above the secondary fine particle recovery device 309. The secondary fine particle recovery device 309 is a cyclone separation device.

[0098] Example 7

[0099] Repeat Example 6, except that a primary air-sealing discharge valve 310 is provided at the lower end of the primary fine particle recovery bin 302.

[0100] A secondary air-sealing discharge valve 311 is provided at the lower end of the secondary fine particle recovery device 309.

[0101] A tertiary air-sealing discharge valve 312 is provided at the fine particle slag outlet of the air-cooling bin 303.

[0102] Example 8

[0103] Repeat Example 7, except that the cooling air duct 306 is disposed around the outer wall of the air-cooling bin 303, and a circular ventilation hole 313 is correspondingly formed in the air-cooling bin 303.

[0104] The air-cooling unit 3 further includes a cooling air cap 314. The cooling air cap 314 is disposed inside the air-cooling bin 303 and is communicated with the cooling air duct 306. The height of the cooling air cap 314 is lower than that of the ventilation hole 313.

[0105] Example 9

[0106] Repeat Example 8, except that the exhaust port of the air-cooling bin 303 is communicated with the air supply duct 305. A high-temperature fan 315 is provided on the air supply duct 305.

[0107] Example 10

[0108] Repeat Example 9, except that a screen is disposed in the exhaust duct 307.

[0109] Application Example 1

[0110] Use the blast furnace ash pyrometallurgy slag cooling system described in Example 4 for slag cooling.

[0111] 1) Feed 63 kg of slag into the blast furnace ash pyrometallurgy slag cooling system from the slag inlet at the upper end of the feed channel 101, and roll downward along the feed channel. The large-particle slag falls into the water-cooling bin, and the small-particle slag falls into the storage hopper 201 of the salt-cooling unit from the lower side wall of the feed channel;

[0112] 2) Cool the large-particle slag in the water-cooling bin, and discharge it from the slag discharge port at the bottom of the water-cooling bin after cooling is completed to obtain 60 kg of large-particle slag; after the small-particle slag falls into the salt-cooling unit, cool it in the salt-cooling bin 202, and discharge it from the slag discharge port at the bottom wall of the salt-cooling bin after cooling is completed to obtain 9 L of slag-containing mixed liquid.

[0113] Application Example 2

[0114] Use the blast furnace ash pyrometallurgy slag cooling system described in Example 10 for slag cooling.

[0115] 1) Feed 80 kg of slag into the blast furnace ash pyrometallurgy slag cooling system from the slag inlet at the upper end of the feed channel 101, and roll downward along the feed channel. The large-particle slag falls into the water-cooling bin, and the small-particle slag falls into the storage hopper 201 of the salt-cooling unit from the lower side wall of the feed channel;

[0116] 2) The large-particle slag is cooled in the water-cooling bin and discharged from the slag discharge port at the bottom of the water-cooling bin after cooling is completed, obtaining 76 kg of large-particle slag; after the small-particle slag falls into the salt-cooling unit, it is cooled by the coolant in the salt-cooling bin 202 and discharged from the slag discharge port on the bottom wall of the salt-cooling bin after cooling is completed, obtaining 12 L of slag-containing mixed liquid.

[0117] 3) An air chamber 301 is provided on the side wall of the salt-cooling bin 202. When the small-particle slag falls in front of the primary air outlet 3012 of the air chamber 301, the fine-particle slag therein is blown into the secondary air inlet 3081 on the storage hopper. A part of the fine-particle slag rolls along the side wall of the storage hopper into the primary fine-particle recovery bin 302 and passes through the primary fine-particle recovery bin into the air-cooling bin 303. Another part falls into the secondary fine-particle recovery device 309 after moving a certain distance with the air flow. After passing through the secondary fine-particle recovery device, it enters the air-cooling bin. After the fine-particle slag is cooled in the air-cooling bin, it is discharged from the fine-particle slag outlet at the lower end of the air-cooling bin 303, obtaining 0.8 kg of fine-particle slag.

Claims

1. A blast furnace ash pyrometallurgical smelting slag cooling system, characterized in that: The device includes a water cooling unit (1) and a salt cooling unit (2); the water cooling unit (1) includes a feed channel (101) and a water cooling bin (102); the feed channel (101) is inclined, and the lower discharge port of the feed channel (101) communicates with the upper feed port of the water cooling bin (102), and the upper opening of the feed channel (101) is the slag inlet; the salt cooling unit (2) includes a storage hopper (201) and a salt cooling bin (202); the storage hopper (201) is arranged at the upper feed port of the salt cooling bin (202), and the upper opening of the storage hopper (201) is located below the lower side wall of the feed channel (101); the lower side wall of the feed channel (101) corresponding to the upper opening of the storage hopper (201) is a sieve plate structure; discharge ports are provided at the bottoms of both the water cooling bin (102) and the salt cooling bin (202).

2. The system according to claim 1, wherein: The water cooling unit (1) further includes a screw slag discharger (103); the screw slag discharger (103) is arranged at the discharge port at the bottom of the water cooling bin (102) and communicates with the discharge port; preferably, the screw slag discharger (103) is of an inclined design with its discharge end higher than its feed end, and its feed end communicates with the discharge port at the bottom of the water cooling bin (102); and / or A water filling port (104) is further provided on the side wall of the water cooling bin (102); and / or The sieve hole diameter of the sieve plate structure on the lower side wall of the feed channel (101) is 15 - 25 mm, preferably 18 - 22 mm.

3. The system according to claim 1 or 2, characterized in that: The upper part of the side wall of the salt cooling bin (202) is a vertical surface, and the lower part of the side wall is an inclined surface that gradually narrows inward; or The side wall of the salt cooling bin (202) is an inclined surface that gradually narrows inward from top to bottom. Preferably, the inclined surface part of the side wall of the salt cooling bin (202) is arranged in a stepped manner, and a high - salt liquid inlet is provided at each step, and a high - salt liquid nozzle (203) is provided at the high - salt liquid inlet; preferably, there are 3 - 7 steps in total on the side wall of the salt cooling bin (202). Preferably, the cross - section of the salt cooling bin (202) is one of a circle, an ellipse, and a rectangle.

4. The system according to any one of claims 1-3, characterized in that: The salt cooling unit (2) further includes a discharger (204); the discharger (204) is arranged at the lower discharge port of the storage hopper (201); and / or The salt cooling unit (2) further includes a slag - liquid transfer pump (205); the slag - liquid transfer pump (205) is arranged at the discharge port at the bottom of the salt cooling bin (202).

5. The system according to any one of claims 1-4, characterized in that: The device further includes an air-cooling unit (3); the air-cooling unit (3) includes an air chamber (301), a primary fine particle recovery bin (302), an air-cooling bin (303), a blast blower (304), a blast air duct (305), a cooling air duct (306), and an exhaust duct (307); the air chamber (301) is arranged on the side wall of the salt-cooling bin (202), and a primary air inlet (3011) and a primary air outlet (3012) are provided on the air chamber (301); the blast air duct (305) is communicated with the primary air inlet (3011); the primary air outlet (3012) is located below the lower discharge port of the storage hopper (201); the primary fine particle recovery bin (302) is a cylindrical structure with openings at both the upper and lower ends, and the upper opening of the primary fine particle recovery bin (302) is arranged in front of the primary air outlet (3012) and is located on the falling path of the fine particle slag; the lower end of the primary fine particle recovery bin (302) is communicated with the air-cooling bin (303); the air-cooling bin (303) is communicated with the blast blower (304) through the cooling air duct (306), a fine particle slag outlet is opened at the lower end of the air-cooling bin (303), and an exhaust port is provided on the side wall of the air-cooling bin (303); the exhaust duct (307) is arranged above the air-cooling unit (3); Preferably, the air-cooling unit (3) further includes an inclined hopper (308); the upper part of the inclined hopper (308) is a cuboid structure, and the lower part is a fan-shaped structure. A secondary air inlet (3081) corresponding to the primary air outlet (3012) is provided on the side wall of the upper part of the inclined hopper (308), and the lower end of the inclined hopper (308) is communicated with the upper opening of the primary fine particle recovery bin (302); Preferably, the air-cooling unit (3) further includes a secondary fine particle recovery device (309); the secondary fine particle recovery device (309) is arranged in parallel with the primary fine particle recovery bin (302) and is located on the side of the primary fine particle recovery bin (302) away from the air chamber (301); the upper part of the secondary fine particle recovery device (309) is an open structure and is communicated with the inclined hopper (308); the exhaust duct (307) is arranged above the secondary fine particle recovery device (309); preferably, the secondary fine particle recovery device (309) is a cyclone separation device or a multi-tube dust removal device; Preferably, a primary air isolation discharge valve (310) is provided at the lower end of the primary fine particle recovery bin (302); and / or a secondary air isolation discharge valve (311) is provided at the lower end of the secondary fine particle recovery device (309); and / or a tertiary air isolation discharge valve (312) is provided at the fine particle slag outlet of the air-cooling bin (303).

6. The system according to claim 5, wherein: The cooling air duct (306) is arranged around the outer side wall of the air-cooling bin (303), and a circular ventilation hole (313) is correspondingly opened on the air-cooling bin (303); and / or The air-cooling unit (3) further includes a cooling air cap (314); the cooling air cap (314) is arranged inside the air-cooling bin (303) and is communicated with the cooling air duct (306); preferably, the height of the cooling air cap (314) is lower than that of the ventilation hole (313).

7. The system according to claim 5 or 6, characterized in that: The exhaust port of the air-cooled bin (303) is communicated with the air supply duct (305); preferably, a high-temperature blower (315) is provided on the air supply duct (305); and / or A screen is provided in the exhaust duct (307).

8. A method for cooling the slag from the pyrometallurgical furnace of blast furnace ash or a method for using the system according to any one of claims 1 to 7, characterized in that: The method includes: 1) The slag enters the blast furnace ash pyrometallurgical slag cooling system from the slag inlet at the upper end of the feed channel (101). The large-particle slag rolls along the lower side wall of the feed channel (101) to the water-cooled bin (102), and the small-particle slag falls into the storage hopper (201) of the salt-cooling unit; 2) The large-particle slag is discharged from the slag discharge port at the bottom of the water-cooled bin after being cooled in the water-cooled bin, and the small-particle slag is discharged from the slag discharge port at the bottom of the salt-cooling bin (202) together with the liquid in the salt-cooling bin (202) after being cooled in the salt-cooling bin (202).

9. The method according to claim 8, wherein: The method further includes: 3) Inputting gas into the air supply duct (305), the air flow ejected from the primary air outlet (3012) separates the fine-particle slag in the small-particle slag and blows it into the air-cooling unit (3). Part of the fine-particle slag enters the primary fine-particle recovery bin (302) through the inclined hopper (308), and the other part of the slag enters the secondary fine-particle recovery device (309); the fine-particle slag enters the air-cooled bin from the primary fine-particle recovery bin (302) and the secondary fine-particle recovery device (309), and is discharged from the fine-particle slag outlet at the lower end of the air-cooled bin (303) after being cooled in the air-cooled bin; Preferably, the air supply duct (305) is communicated with the exhaust port of the air-cooled bin (303); gas is sent into the cooling air duct (306), the gas enters the air supply duct (305) from the exhaust port after passing through the air-cooled bin (303), then separates the fine-particle slag in the small-particle slag, and blows the fine-particle slag into the air-cooling unit (3) for cooling.

10. The method according to claim 8 or 9, characterized in that: The method further includes: 4) Introducing the hot air discharged from the exhaust duct (307) into the waste heat power generation or steam crystallization process.

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