Blast furnace ash recovery iron and carbon system

Abstract

The present invention provides a blast furnace ash iron and carbon recovery system, relates to the technical field of blast furnace ash recovery and treatment, and solves the technical problem of waste of resources caused by blast furnace ash in the prior art. The device comprises a solution preparation device, a blast furnace ash iron recovery device, a blast furnace ash carbon recovery device and a solution recovery device, wherein the solution preparation device, the blast furnace ash iron recovery device, the blast furnace ash carbon recovery device and the solution recovery device are sequentially connected, and the blast furnace ash passes through the solution preparation device, the blast furnace ash iron recovery device, the blast furnace ash carbon recovery device and the solution recovery device in sequence; the blast furnace ash iron recovery device is provided with a magnetic part, and during the process of the blast furnace ash solution configured by the solution preparation device passing through the blast furnace ash iron recovery device, the magnetic part can absorb the iron in the blast furnace ash solution; when a flotation agent is added to the blast furnace ash carbon recovery device, the carbon in the blast furnace ash solution can float on it. The present invention is used for the reuse of blast furnace ash.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ash recovery and treatment, in particular to a system for recovering iron and carbon from blast furnace ash. Background Art

[0002] As we all know, blast furnace ash is mainly composed of carbon and metal oxides such as zinc and iron. It is a light and fine-grained substance and one of the main solid emissions of steel enterprises. With the rapid development of China's steel industry, steel production has increased year by year, and the output of blast furnace ash has also continued to increase. If comprehensive utilization is not implemented, it will not only pollute the environment, but also cause waste of resources. Summary of the invention

[0003] The purpose of the present invention is to provide a system for recovering iron and carbon from blast furnace ash to solve the technical problem of waste of resources caused by blast furnace ash in the prior art. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a blast furnace ash iron and carbon recovery system, comprising a solution preparation device, a blast furnace ash iron recovery device, a blast furnace ash carbon recovery device and a solution recovery device, wherein the solution preparation device, the blast furnace ash iron recovery device, the blast furnace ash carbon recovery device and the solution recovery device are sequentially connected, and the blast furnace ash passes through the solution preparation device, the blast furnace ash iron recovery device, the blast furnace ash carbon recovery device and the solution recovery device in sequence;

[0006] The blast furnace ash iron recovery device is provided with a magnetic member, and when the blast furnace ash solution prepared by the solution preparation device passes through the blast furnace ash iron recovery device, the magnetic member can absorb the iron in the blast furnace ash solution;

[0007] When a flotation agent is added into the blast furnace ash carbon recovery device, the carbon in the blast furnace ash solution can float thereon.

[0008] Optionally, the solution preparation device includes a ball mill and a stirring device, the outlet of the ball mill is connected to the liquid inlet of the stirring device through a pipeline, and the liquid outlet of the stirring device is connected to the inlet of the blast furnace ash iron recovery device.

[0009] Optionally, the stirring device is a stirring barrel.

[0010] Optionally, the stirring device includes a stirring paddle, a barrel body, a stirring motor and a stirring shaft, the stirring paddle is connected to the stirring shaft and is distributed along the length direction of the stirring shaft, the stirring paddle is located inside the barrel body, the stirring motor is fixedly connected to the end of the stirring shaft and is located outside the barrel body.

[0011] Optionally, the blast furnace ash iron recovery device is a magnetic separator.

[0012] Optionally, the blast furnace ash iron recovery device includes a magnetic separator frame, a first trough body, a water spray box, a first collecting box, a second collecting box, a conveyor belt and a conveyor belt frame. The first trough body is arranged on the magnetic separator frame and the first trough body is connected to the solution preparation device, the conveyor belt frame is inclinedly arranged on the magnetic separator frame, the water spray box is arranged on the conveyor belt frame, the first collecting box and the second collecting box are arranged on the magnetic separator frame, the first collecting box holds the iron in the blast furnace ash solution, the second collecting box holds the solution after the iron is removed and the second collecting box is connected to the blast furnace ash carbon recovery device, the conveyor belt is wrapped around the conveyor belt frame, the blast furnace ash solution in the first trough body is sprinkled on the conveyor belt through a pipe, the magnetic component is located between the upper end surface of the conveyor belt frame and the conveyor belt, and the conveyor belt frame is connected to the magnetic component.

[0013] Optionally, the blast furnace ash carbon recovery device is a flotation machine.

[0014] Optionally, the blast furnace ash carbon recovery device includes a stirring mechanism, a bubble scraping mechanism and a second tank body, the stirring mechanism and the bubble scraping mechanism are both rotatably connected to the second tank body, the bubble scraping mechanism is located in the upper area of ​​the second tank body, part of the stirring mechanism extends into the second tank body, the inlet of the second tank body is connected to the blast furnace ash iron recovery device, and the outlet of the second tank body is connected to the solution recovery device.

[0015] Optionally, the solution recovery device is a ceramic filter and a solution recovery box, the outlet of the ceramic filter is connected to the inlet of the solution recovery box, and the inlet of the ceramic filter is connected to the outlet of the blast furnace ash carbon recovery device.

[0016] Optionally, the flotation reagents are frothers and collectors.

[0017] The present invention provides a blast furnace ash iron and carbon recovery system, which allows blast furnace ash to pass through a blast furnace ash iron recovery device and a blast furnace ash carbon recovery device in sequence to respectively recover the iron and carbon therein. After the blast furnace ash solution passes through the blast furnace ash iron recovery device, the iron in the blast furnace ash solution can be attracted by a magnetic part, and the iron can be recovered, so that the blast furnace ash solution has relatively little or almost no residual iron. When a flotation agent is added to the blast furnace ash carbon recovery device, the carbon in the blast furnace ash solution can float on it, so that the carbon can be easily collected, so that the blast furnace ash solution has relatively little or almost no residual carbon. The blast furnace ash solution that has passed through the solution recovery device can be collected to avoid polluting the environment, thereby solving the technical problem of waste of resources caused by blast furnace ash in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a process flow chart of a system for recovering iron and carbon from blast furnace ash provided by an embodiment of the present invention;

[0020] Figure 2 2 is a schematic structural diagram of a stirring device of a blast furnace ash iron and carbon recovery system provided in an embodiment of the present invention;

[0021] Figure 3 2 is a schematic structural diagram of a blast furnace ash iron recovery device of a blast furnace ash iron and carbon recovery system provided in an embodiment of the present invention;

[0022] Figure 4 2 is a schematic structural diagram of a blast furnace ash carbon recovery device of a blast furnace ash iron and carbon recovery system provided in an embodiment of the present invention;

[0023] In the figure, 1. solution preparation device; 11. ball mill; 12. stirring device; 121. stirring paddle; 122. barrel; 123. stirring motor; 124. stirring shaft; 2. blast furnace ash iron recovery device; 21. magnetic parts; 22. magnetic separator frame; 23. first tank body; 24. water spray box; 25. conveyor belt; 26. conveyor belt frame; 3. blast furnace ash carbon recovery device; 31. stirring mechanism; 32. bubble scraping mechanism; 33. second tank body; 4. solution recovery device; 41. ceramic filter; 42. solution recovery box. DETAILED DESCRIPTION

[0024] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0025] The present invention provides a blast furnace ash iron and carbon recovery system, comprising a solution preparation device 1, a blast furnace ash iron recovery device 2, a blast furnace ash carbon recovery device 3 and a solution recovery device 4, wherein the solution preparation device 1, the blast furnace ash iron recovery device 2, the blast furnace ash carbon recovery device 3 and the solution recovery device 4 are sequentially connected, and the blast furnace ash passes through the solution preparation device 1, the blast furnace ash iron recovery device 2, the blast furnace ash carbon recovery device 3 and the solution recovery device 4 in sequence; the blast furnace ash iron recovery device 2 is provided with a magnetic part 21, and during the process that the blast furnace ash solution prepared by the solution preparation device 1 passes through the blast furnace ash iron recovery device 2, the magnetic part 21 can absorb the iron in the blast furnace ash solution; when a flotation agent is added to the blast furnace ash carbon recovery device 3, the carbon in the blast furnace ash solution can float on it. The present invention provides a blast furnace ash iron and carbon recovery system, which recovers the iron and carbon therein respectively by passing the blast furnace ash through a blast furnace ash iron recovery device 2 and a blast furnace ash carbon recovery device 3 in sequence. After the blast furnace ash solution passes through the blast furnace ash iron recovery device 2, the iron in the blast furnace ash solution can be adsorbed by a magnetic part 21, and the iron can be recovered, so that the blast furnace ash solution has relatively little or almost no iron remaining. When a flotation agent is added to the blast furnace ash carbon recovery device 3, the carbon in the blast furnace ash solution can float on it, so that the carbon can be easily collected, so that the blast furnace ash solution has relatively little or almost no carbon remaining. The blast furnace ash solution that passes through the solution recovery device 4 can be collected to avoid polluting the environment, thereby solving the technical problem of waste of resources caused by blast furnace ash in the prior art.

[0026] As an optional embodiment, the solution preparation device 1 includes a ball mill 11 and a stirring device 12, the outlet of the ball mill 11 is connected to the liquid inlet of the stirring device 12 through a pipeline, and the liquid outlet of the stirring device 12 is connected to the inlet of the blast furnace ash iron recovery device 2. The ball mill 11 has the function of crushing the blast furnace ash, so that the blast furnace ash iron recovery device 2 and the blast furnace ash carbon recovery device 3 can collect all the iron and carbon in the blast furnace ash, and the stirring device 12 mixes the blast furnace ash with water and stirs it into a solution.

[0027] As an optional embodiment, the stirring device 12 can be a stirring barrel, which includes a stirring paddle 121, a barrel body 122, a stirring motor 123 and a stirring shaft 124. The stirring paddle 121 is connected to the stirring shaft 124 and is distributed along the length direction of the stirring shaft 124. The stirring paddle 121 is located in the barrel body 122, and the stirring motor 123 is fixedly connected to the end of the stirring shaft 124 and is located outside the barrel body 122.

[0028] As an optional embodiment, the blast furnace ash iron recovery device 2 can be a magnetic separator, which includes a magnetic separator frame 22, a first trough body 23, a water spray box 24, a first collecting box, a second collecting box, a conveyor belt 25 and a conveyor belt frame 26. The first trough body 23 is arranged on the magnetic separator frame 22 and the first trough body 23 is connected to the solution preparation device 1, the conveyor belt frame 26 is obliquely arranged on the magnetic separator frame 22, the water spray box 24 is arranged on the conveyor belt frame 26, the first collecting box and the second collecting box are arranged on the magnetic separator frame 22, the first collecting box contains iron in the blast furnace ash solution, the second collecting box contains solution after the iron is removed and the second collecting box is connected to the blast furnace ash carbon recovery device 3, the conveyor belt 25 is wrapped around the conveyor belt frame 26, the blast furnace ash solution in the first trough body 23 is sprinkled on the conveyor belt 25 through a pipeline, the magnetic member 21 is located between the upper end surface of the conveyor belt frame 26 and the conveyor belt 25, and the conveyor belt frame 26 is connected to the magnetic member 21. The blast furnace ash solution in the first trough body 23 is sprinkled onto the conveyor belt 25 through a pipe. The blast furnace ash solution will flow downward along the conveyor belt 25 by its own gravity and enter the second collecting box, while the iron in the blast furnace ash solution will be attracted by the magnetic part 21 and move upward along the conveyor belt 25. When it moves to a certain height, the water spray box 24 will spray high-pressure water and then spray it onto the iron on the conveyor belt 25, and then the iron will enter the first collecting box, thereby realizing the collection of iron.

[0029] As an optional embodiment, the blast furnace ash carbon recovery device 3 can be a flotation machine, and the blast furnace ash carbon recovery device 3 includes a stirring mechanism 31, a bubble scraping mechanism 32 and a second tank body 33. The stirring mechanism 31 and the bubble scraping mechanism 32 are both rotatably connected to the second tank body 33. The bubble scraping mechanism 32 is located in the upper area of ​​the second tank body 33. Part of the stirring mechanism 31 extends into the second tank body 33. The inlet of the second tank body 33 is connected to the blast furnace ash iron recovery device 2, and the outlet of the second tank body 33 is connected to the solution recovery device 4. The blast furnace ash carbon recovery device 3 is stirred by the stirring mechanism 31. On the one hand, sufficient air is inhaled to mix with the blast furnace ash solution, and on the other hand, the blast furnace ash solution is stirred to mix with the flotation agent, and at the same time, the foam is refined, so that the carbon is bonded to the foam, floats to the surface of the blast furnace ash solution and then forms carbonized foam, and the carbonized foam is scraped out by the bubble scraping mechanism 32 to collect carbon.

[0030] As an optional implementation, the solution recovery device 4 is a ceramic filter 41 and a solution recovery box 42, the outlet of the ceramic filter 41 is connected to the inlet of the solution recovery box 42, and the inlet of the ceramic filter 41 is connected to the outlet of the blast furnace ash carbon recovery device 3. The ceramic filter 41 works based on the principle of capillary pores, using microporous ceramics as the filter medium, and utilizing a large number of microporous ceramics with a solid-liquid separation device designed with the capillary action principle. The disc filter under negative pressure working state utilizes the unique water-permeable and air-impermeable characteristics of the microporous ceramic filter plate to extract the vacuum in the inner cavity of the ceramic filter plate to generate a pressure difference with the outside, so that the suspended materials in the material tank are adsorbed on the ceramic filter plate under the action of negative pressure, and the solid materials are trapped on the surface of the ceramic plate because they cannot pass through the microporous ceramic filter plate, while the liquid passes smoothly into the gas-liquid distribution device (vacuum barrel) due to the vacuum pressure difference and the hydrophilicity of the ceramic filter plate, so as to achieve the purpose of solid-liquid separation. The ceramic filter 41 can collect zinc in the blast furnace ash solution.

[0031] As an optional implementation, the flotation reagents are frothers and collectors. Frothing agents are surface active molecules with hydrophilic groups and hydrophobic groups. They are directionally adsorbed on the water-air interface, reducing the surface tension of the aqueous solution, making it easy for the air filled into the water to diffuse into bubbles and produce stable foam. Collectors are flotation agents that change the hydrophobicity of the mineral surface and make the floating mineral particles adhere to the bubbles. They are the most important type of flotation agents and have two most basic properties: they can selectively adsorb on the mineral surface; they can increase the hydrophobicity of the mineral surface, making it easy to adhere to the bubbles, thereby improving the floatability of the mineral. Frothing agents and collectors have a combined effect, adsorbing together on the surface of mineral particles to promote the floating of minerals.

[0032] The process flow of the blast furnace ash recovery system for iron and carbon of the present invention is as follows:

[0033] 1. Slurry preparation: adding blast furnace ash into the ball mill 11, crushing the blast furnace ash, adding the crushed blast furnace ash into the stirring device 12, and adding water into the stirring device 12, stirring to form a blast furnace ash solution;

[0034] 2. Collecting iron: The blast furnace ash solution in the stirring device 12 is passed into the blast furnace ash iron recovery device 2, and the iron in the blast furnace ash solution is absorbed by the magnetic member 21 to achieve iron collection;

[0035] 3. Carbon removal: The solution in the blast furnace ash iron recovery device 2 is passed into the blast furnace ash carbon recovery device 3, and a flotation agent is added therein, so that the carbon floats on the solution and is scraped away to collect the carbon;

[0036] 4. Residual solution recovery: The solution in the blast furnace ash carbon recovery device 3 is passed into the ceramic filter 41 to collect zinc in the solution, and the remaining solution is passed into the solution recovery tank 42.

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A system for recovering iron and carbon from blast furnace ash, characterized in that: The invention comprises a solution preparation device (1), a blast furnace ash iron recovery device (2), a blast furnace ash carbon recovery device (3) and a solution recovery device (4), wherein: The solution preparation device (1), the blast furnace ash iron recovery device (2), the blast furnace ash carbon recovery device (3) and the solution recovery device (4) are sequentially connected, and the blast furnace ash passes through the solution preparation device (1), the blast furnace ash iron recovery device (2), the blast furnace ash carbon recovery device (3) and the solution recovery device (4) in sequence; The blast furnace ash iron recovery device (2) is provided with a magnetic member (21), and when the blast furnace ash solution prepared by the solution preparation device (1) passes through the blast furnace ash iron recovery device (2), the magnetic member (21) can absorb the iron in the blast furnace ash solution; When a flotation agent is added into the blast furnace ash carbon recovery device (3), the carbon in the blast furnace ash solution can float on it; The solution preparation device (1) comprises a ball mill (11) and a stirring device (12), wherein the outlet of the ball mill (11) is connected to the liquid inlet of the stirring device (12) via a pipeline, and the liquid outlet of the stirring device (12) is connected to the inlet of the blast furnace ash iron recovery device (2); The blast furnace ash iron recovery device (2) is a magnetic separator; The blast furnace ash iron recovery device (2) comprises a magnetic separator frame (22), a first tank body (23), a water spray box (24), a first collection box, a second collection box, a conveyor belt (25) and a conveyor belt frame (26), wherein the first tank body (23) is arranged on the magnetic separator frame (22) and the first tank body (23) is connected to the solution preparation device (1), the conveyor belt frame (26) is inclinedly arranged on the magnetic separator frame (22), the water spray box (24) is arranged on the conveyor belt frame (26), and the first collection box and the second collection box are arranged on the conveyor belt frame (26). On the magnetic separator frame (22), the first collecting box contains the iron in the blast furnace ash solution, the second collecting box contains the solution after the iron is removed and the second collecting box is connected to the blast furnace ash carbon recovery device (3), the conveyor belt (25) is wound around the conveyor belt frame (26), the blast furnace ash solution in the first trough (23) is sprinkled on the conveyor belt (25) through a pipeline, the magnetic member (21) is located between the upper end surface of the conveyor belt frame (26) and the conveyor belt (25), and the conveyor belt frame (26) is connected to the magnetic member (21); The blast furnace ash carbon recovery device (3) is a flotation machine; The blast furnace ash carbon recovery device (3) comprises a stirring mechanism (31), a bubble scraping mechanism (32) and a second tank body (33); the stirring mechanism (31) and the bubble scraping mechanism (32) are both rotatably connected to the second tank body (33); the bubble scraping mechanism (32) is located in the upper region of the second tank body (33); a portion of the stirring mechanism (31) extends into the second tank body (33); an inlet of the second tank body (33) is connected to the blast furnace ash iron recovery device (2); and an outlet of the second tank body (33) is connected to the solution recovery device (4); The solution recovery device (4) comprises a ceramic filter (41) and a solution recovery box (42), wherein the outlet of the ceramic filter (41) is connected to the inlet of the solution recovery box (42), and the inlet of the ceramic filter (41) is connected to the outlet of the blast furnace ash carbon recovery device (3).

2. The blast furnace ash recovery iron and carbon system according to claim 1, characterized in that: The stirring device (12) is a stirring barrel.

3. The blast furnace ash recovery iron and carbon system according to claim 1 or 2, characterized in that: The stirring device (12) comprises a stirring paddle (121), a barrel (122), a stirring motor (123) and a stirring shaft (124); the stirring paddle (121) is connected to the stirring shaft (124) and the stirring paddle (121) is distributed along the length direction of the stirring shaft (124); the stirring paddle (121) is located inside the barrel (122); the stirring motor (123) is fixedly connected to an end of the stirring shaft (124) and the stirring motor (123) is located outside the barrel (122).

4. The system for recovering iron and carbon from blast furnace ash according to claim 1, characterized in that: The flotation reagents are frother and collector.

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