Method and device for recycling industrial tailings

Abstract

The application provides a recycling method and device of industrial tailings, and relates to the technical field of industrial tailings recycling. The method comprises the following steps: electrolytic manganese slag is mixed with lime or alkali liquor and stirred, ammonia gas is recovered by negative pressure to obtain pretreated manganese slag and ammonia water; shale is crushed, pulverized and aged to obtain aged shale material; water-quenched slag is mixed with coal gangue to obtain mixed auxiliary material; the three are mixed and stirred to form molding raw material, and the molding raw material is molded, dried and sintered at 950 DEG C to obtain manganese slag sintered porous brick. The device comprises an ammonia gas negative pressure recovery system, a stirring unit, a crushing and pulverizing unit, an aging bin, a molding machine, a drying kiln and a sintering kiln. The application removes ammonia nitrogen, reduces pollution, absorbs various industrial tailings, produces ammonia water as by-product, and realizes the recycling of the porous brick.

Description

Technical Field

[0001] This invention relates to the field of industrial waste recycling technology, and particularly to a method and apparatus for recycling industrial waste. Background Technology

[0002] Electrolytic manganese production generates a large amount of solid waste – electrolytic manganese slag. Currently, electrolytic manganese slag is mainly disposed of through open-air dumping or landfilling, which not only occupies a large amount of land resources, but also allows harmful substances such as soluble manganese and ammonia nitrogen to easily seep into the soil and groundwater under the leaching effect of rainwater, causing serious environmental pollution.

[0003] Due to the complex composition, high moisture content, and presence of a certain amount of ammonia nitrogen in electrolytic manganese slag, traditional comprehensive utilization methods are relatively limited, and there is currently a lack of large-scale, economically feasible recycling methods. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for recycling industrial waste, aiming to solve the problems of difficult treatment and serious environmental pollution caused by electrolytic manganese slag in the prior art, and to realize the resource utilization of waste.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A method and apparatus for recycling industrial waste, characterized in that the method for recycling industrial waste includes the following steps: Step 1: Mix the electrolytic manganese slag with either lime or alkaline solution, and recover the ammonia gas generated during the mixing process under negative pressure to obtain pretreated manganese slag and ammonia water. Step 2: The shale is crushed, pulverized, and aged to obtain aged shale material; Step 3: Mix the water-quenched slag with coal gangue to obtain a mixed auxiliary material; Step 4: Mix and stir the pretreated manganese slag, the aged shale, and the mixed auxiliary materials to obtain a uniformly mixed molding raw material; Step 5: The raw material is shaped to obtain a brick blank; Step 6: Dry the brick blanks; Step 7: Sinter the dried brick blanks at 950℃ to obtain manganese slag sintered porous bricks. Step 8: Finished products are put into storage.

[0006] As an improvement, the mass percentage of each component in the molding raw material is as follows: manganese slag 35-50%, lime or alkali solution 3-6%, water-quenched slag 14-16%, and shale powder 45-50%.

[0007] As an improvement, the mixing of the pretreated manganese slag, the aged shale material, and the mixed auxiliary materials adopts a three-stage mixing method.

[0008] As an improvement, industrial waste recycling devices include: An ammonia negative pressure recovery system includes: a sealed mixing tank 1, a negative pressure fan 2, and an ammonia absorption tower 3. The outlet of the sealed mixing tank 1 is connected to the inlet of the negative pressure fan 2, and the outlet of the negative pressure fan 2 is connected to the inlet of the ammonia absorption tower. The first mixing unit 4 is connected to the sealed mixing tank 1 and is used to mix and stir electrolytic manganese slag with lime or alkaline solution. Crushing and pulverizing unit 5 is used for crushing and pulverizing shale. The aging chamber 6 has its inlet connected to the outlet of the crushing and pulverizing unit 5 and is used to age the crushed shale. The inlet of the second mixer unit 7 is connected to the outlet of the sealed mixing tank 1, the outlet of the aging chamber 6, and the supply source 11 for water-quenched slag and coal gangue, respectively, and is used to mix and stir the pretreated manganese slag, aged shale and mixed auxiliary materials. Molding machine 8, the inlet of which is connected to the outlet of the second mixer unit 7, is used to form brick blanks from the uniformly mixed molding raw materials; Drying kiln 9, the inlet of which is connected to the outlet of the molding machine, is used to dry the brick blanks; The sintering kiln 10 has its inlet connected to the outlet of the drying kiln 9 and is used to sinter the dried brick blanks at 950°C.

[0009] As an improvement, the first mixing unit 4 is a two-stage mixer.

[0010] As an improvement, the second mixer unit 7 is a three-stage mixer.

[0011] The beneficial effects of this invention are as follows: by pretreatment with either lime or alkaline solution combined with ammonia negative pressure recovery, ammonia nitrogen in electrolytic manganese slag is effectively removed, reducing the risk of heavy metal leaching and solving environmental pollution problems from the source. At the same time, the by-product ammonia water can be recycled and reused, increasing added value. Using electrolytic manganese slag as the main raw material, and utilizing various industrial tailings such as shale, water-quenched slag, and coal gangue, the overall amount of solid waste disposal is greatly increased, the pressure of stockpiling is alleviated, and land resources are saved. Through multi-stage stirring, shale aging, and precise temperature-controlled sintering processes, the resulting manganese slag sintered porous bricks have high strength, reasonable porosity, and stable drying and firing shrinkage, meeting the requirements for wall materials. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a method and apparatus for recycling industrial waste according to the present invention; Figure 2 This is a flowchart of a method and apparatus for recycling industrial waste according to the present invention.

[0013] In the diagram: 1. Sealed mixing tank; 2. Negative pressure fan; 3. Ammonia absorption tower; 4. First mixing unit; 5. Crushing and pulverizing unit; 6. Aging silo; 7. Second mixing unit; 8. Molding machine; 9. Drying kiln; 10. Sintering kiln; 11. Supply source of water-quenched slag and coal gangue. Detailed Implementation

[0014] To make the content of this invention easier to understand, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0015] Example 1 This embodiment provides a method for recycling industrial waste, including the following steps: Step 1: Electrolytic manganese slag and quicklime are mixed at a mass ratio of 100:5 in a sealed mixing tank 1. During the mixing process, a negative pressure fan 2 is turned on to introduce the generated ammonia gas into an ammonia absorption tower 3 for absorption, resulting in ammonia water and pretreated manganese slag. Step 2: Shale is crushed and pulverized to a particle size of less than 2mm by a crushing and pulverizing unit 5, and then sent to an aging chamber 6 for aging for 72 hours to obtain aged shale material. Step 3: Water-quenched slag and coal gangue are mixed at a mass ratio of 1:1 to obtain mixed auxiliary materials. Step 4: By mass percentage, 35% of the pretreated manganese slag material, 45% of the aged shale material, 15% of the mixed auxiliary materials, and the remaining lime (total lime addition accounts for 5% of the molding raw material) are taken and sent to a second mixing unit 7 for three-stage mixing to obtain uniformly mixed molding raw materials. Step 5: The molding raw materials are sent to a molding machine 8 for extrusion molding to obtain brick blanks. Step 6: Send the brick blanks into drying kiln 9 for drying at a temperature of 80-120℃ until the moisture content is below 6%. Step 7: Send the dried brick blanks into sintering kiln 10 for sintering at 950℃ for 4 hours. After natural cooling, manganese slag sintered porous bricks are obtained.

[0016] Step 8: Finished products are put into storage Example 2 This example provides a method for recycling industrial waste. The difference from Example 1 is that in step 1, alkali solution is used instead of lime, and the proportions of each component are different. Step 1: Electrolytic manganese slag and sodium hydroxide solution (concentration 10%) are mixed at a mass ratio of 100:30 (equivalent to approximately 3% dry alkali addition). The mixture is stirred in a sealed mixing tank 1, and the generated ammonia gas is recovered under negative pressure to obtain ammonia water and pretreated manganese slag. Step 2: Shale is crushed and pulverized to a particle size of less than 2mm using a crushing and pulverizing unit 5, and then sent to an aging chamber 6 for 72 hours to obtain aged shale material. Step 3: Water-quenched slag and coal gangue are mixed at a mass ratio of 1:1 to obtain mixed auxiliary materials. Step 4: By mass percentage, take 42% pretreated manganese slag, 40% aged shale, and 15% mixed auxiliary materials (water-quenched slag: coal gangue = 1:1), and add a small amount of water to adjust the moisture content. Feed this mixture into the second mixing unit 7 for three-stage mixing to obtain a uniformly mixed molding raw material. Sodium hydroxide has already been added in step 1 in this ratio. Step 5: Feed the molding raw material into the molding machine 8 for extrusion molding to obtain brick blanks. Step 6: Feed the brick blanks into the drying kiln 9 for drying at a temperature of 80-120℃ until the moisture content is below 6%. Step 7: Feed the dried brick blanks into the sintering kiln 10 for sintering at 950℃ for 4 hours. After natural cooling, manganese slag sintered porous bricks are obtained.

[0017] Step 8: Finished products are put into storage Example 3 This embodiment provides a method for recycling industrial waste, including the following steps: Step 1: Electrolytic manganese slag and quicklime are mixed and stirred at a mass ratio of 100:4, and the generated ammonia gas is recovered under negative pressure to obtain pretreated manganese slag and ammonia water. Step 2: Shale is crushed, pulverized, and aged to obtain aged shale material. Step 3: Water-quenched slag and coal gangue are mixed to obtain mixed auxiliary material. Step 4: By mass percentage, 40% of the pretreated manganese slag material, 43% of the aged shale material, 14% of the mixed auxiliary material (water-quenched slag: coal gangue = 1:1), and 3% of the quicklime (part of the quicklime was added in step 1, and the remainder was added in this step to adjust the proportion) are fed into the second mixing unit 7 for three-stage mixing to obtain a uniformly mixed molding raw material. Step 5: The molding raw material is molded to obtain brick blanks. Step 6: The brick blanks are dried. Step 7: Sinter the dried brick blanks at 950℃ to obtain manganese slag sintered porous bricks.

[0018] Step 8: Finished products are put into storage.

[0019] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method and apparatus for recycling industrial waste, characterized in that, The methods for recycling industrial waste include the following steps: Step 1: Mix the electrolytic manganese slag with either lime or alkaline solution, and recover the ammonia gas generated during the mixing process under negative pressure to obtain pretreated manganese slag and ammonia water. Step 2: The shale is crushed, pulverized, and aged to obtain aged shale material; Step 3: Mix the water-quenched slag with coal gangue to obtain a mixed auxiliary material; Step 4: Mix and stir the pretreated manganese slag, the aged shale, and the mixed auxiliary materials to obtain a uniformly mixed molding raw material; Step 5: The raw material is shaped to obtain a brick blank; Step 6: Dry the brick blanks; Step 7: Sinter the dried brick blanks at 950℃ to obtain manganese slag sintered porous bricks. Step 8: Finished products are put into storage.

2. The method and apparatus for recycling industrial waste according to claim 1, characterized in that, The mass percentage of each component in the molding raw material is as follows: manganese slag 35-50%, lime or alkaline solution 3-6%, water-quenched slag 14-16%, and shale powder 45-50%.

3. The method and apparatus for recycling industrial waste according to claim 1, characterized in that, The electrolytic manganese slag is mixed with either lime or alkaline solution using a two-stage mixing method.

4. The method and apparatus for recycling industrial waste according to claim 1, characterized in that, The pretreated manganese slag, the aged shale, and the mixed auxiliary materials are mixed using a three-stage mixing method.

5. The method and apparatus for recycling industrial waste according to claim 1, characterized in that, Industrial waste recycling equipment includes: An ammonia negative pressure recovery system includes: a sealed mixing tank (1), a negative pressure fan (2), and an ammonia absorption tower (3). The outlet of the sealed mixing tank (1) is connected to the inlet of the negative pressure fan (2), and the outlet of the negative pressure fan (2) is connected to the inlet of the ammonia absorption tower. The first mixing unit (4) is connected to the sealed mixing tank (1) and is used to mix and stir electrolytic manganese slag with lime or alkaline solution. Crushing and pulverizing unit (5) is used for crushing and pulverizing shale; The aging chamber (6) is connected to the outlet of the crushing and pulverizing unit (5) for aging the crushed shale. The inlet of the second mixer unit (7) is connected to the outlet of the sealed mixing tank (1), the outlet of the aging bin (6), and the supply source (11) of water-quenched slag and coal gangue, respectively, for mixing and stirring the pretreated manganese slag, aged shale and mixed auxiliary materials. A molding machine (8) is connected at its inlet to the outlet of the second mixer unit (7) for forming brick blanks from uniformly mixed molding raw materials. A drying kiln (9) is connected to the outlet of the molding machine for drying brick blanks. A sintering kiln (10) is provided, the inlet of which is connected to the outlet of the drying kiln (9), for sintering the dried brick blanks at 950°C.

6. The method and apparatus for recycling industrial waste according to claim 5, characterized in that, The first mixer unit (4) is a two-stage mixer.

7. The method and apparatus for recycling industrial waste according to claim 5, characterized in that, The second mixer unit (7) is a three-stage mixer.

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