Continuous efficient production system for improving volume stability of steel slag aggregate for road

Abstract

The utility model relates to a continuous efficient production system for improving the volume stability of steel slag aggregate for roads, which is characterized in that an input conveyor belt and an output conveyor belt are arranged at the front end of a steel slag treatment plant, an atomization spraying unit is arranged above the steel slag treatment plant, and the rear end of the steel slag treatment plant is sequentially connected with a precipitation unit and an ultraviolet catalysis unit; the ultraviolet catalysis unit and the automatic liquid supplementing unit are both connected to the atomization spraying unit through a conveying pipe, and a conveying pump is arranged on the conveying pipe. The acidizing treatment liquid is adopted, so that the contact action area of the treatment liquid and the steel slag can be increased to the greatest extent, the reaction treatment rate is increased, the consumption of a treatment agent is reduced, and the volume stability of the steel slag aggregate for the road is remarkably improved; a closed-loop design is adopted, acidizing treatment liquid can be recycled after being subjected to precipitation, filtration and ultraviolet catalysis treatment, consumption and treatment cost of acid liquid are reduced, meanwhile, it is ensured that the treatment effect is uniform and stable, the purity of the treatment liquid is ensured, and the resource recycling effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of steel slag aggregate processing technology, specifically relating to a continuous and efficient production system for improving the volume stability of steel slag aggregates used in road construction. Background Technology

[0002] Steel slag is a major solid waste generated during steelmaking. Currently, my country's annual steel slag production exceeds 70 million tons, and the total stockpiled volume exceeds 1 billion tons. However, my country's comprehensive utilization rate of steel slag is low, with the vast majority being treated as industrial waste and disposed of through landfills or stockpiles, causing problems such as land occupation and environmental pollution. The Environmental Protection Tax Law stipulates that an environmental protection tax of 25 yuan per ton will be levied on untreated steel slag produced by steel enterprises. Therefore, the effective resource utilization of steel slag has significant social, economic, and environmental benefits.

[0003] The poor volume stability of steel slag is the main reason that restricts its large-scale use in road materials. Although steel slag has the potential to be used in road materials, the free calcium oxide and free magnesium oxide in steel slag can undergo hydration reactions under aqueous media to generate calcium hydroxide and magnesium hydroxide with a larger specific gravity, causing the steel slag to expand in volume. Therefore, improving the volume stability of steel slag remains one of the keys to the resource utilization of steel slag.

[0004] Currently, various methods exist for treating the volume stability of steel slag, including aging, carbonation, liquid treatment agents (primarily acids), and autoclaving. However, aging is time-consuming and yields poor results; carbonation and autoclaving are costly and require sophisticated equipment, making most methods unsuitable for engineering applications. Liquid treatment agents are widely recognized both domestically and internationally as the most likely method for large-scale engineering applications in terms of treatment effectiveness and economic viability. However, the lack of a mature, continuous production system for liquid treatment agents currently limits the large-scale application of steel slag in engineering projects. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous and efficient production system for improving the volume stability of steel slag aggregate for road use. This system achieves the effect of improving the volume stability of steel slag, with a short processing cycle, good processing effect, and is suitable for large-scale steel slag processing.

[0006] The technical problem solved by this utility model is achieved through the following technical solution:

[0007] A continuous and efficient production system for improving the volume stability of steel slag aggregate for road use includes a steel slag processing plant, an atomizing spray unit, a sedimentation unit, an ultraviolet catalysis unit, and an automatic liquid replenishment unit. The front end of the steel slag processing plant is equipped with an input conveyor belt and an output conveyor belt. The atomizing spray unit is located above the steel slag processing plant. The rear end of the steel slag processing plant is sequentially connected to the sedimentation unit and the ultraviolet catalysis unit. Both the ultraviolet catalysis unit and the automatic liquid replenishment unit are connected to the atomizing spray unit through a conveying pipe, and a conveying pump is installed on the conveying pipe.

[0008] Furthermore, the precipitation unit includes a primary precipitation tank and a secondary precipitation tank connected in sequence. Both the primary and secondary precipitation tanks are equipped with precipitate discharge valves on their bottom sides. The upper right side of the secondary precipitation tank is connected to the ultraviolet catalytic unit through a first filter.

[0009] Furthermore, the ultraviolet catalytic unit includes a catalytic tank and an ultraviolet emitter disposed above the catalytic tank. A precipitate discharge valve is disposed on the bottom side of the catalytic tank, and the upper right side of the catalytic tank is connected to the automatic liquid replenishment unit through a second filter.

[0010] Furthermore, the automatic replenishment unit includes a treatment liquid storage tank, a concentration detector, and a delivery pump. The treatment liquid storage tank replenishes the treatment liquid according to the concentration of the treatment liquid detected by the concentration detector, and the treatment liquid of the automatic replenishment unit is pumped to the atomizing spray unit by the delivery pump.

[0011] Furthermore, the atomizing spray unit includes several spray heads arranged in parallel, and the spray heads are conical spray heads.

[0012] Furthermore, the ultraviolet wavelength range of the ultraviolet emitter is 300–400 nm, and the irradiance range is 60–180 W / m. 2 .

[0013] The advantages and beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses an acidification treatment liquid, which can maximize the contact area between the treatment liquid and the steel slag, promote the reaction rate, reduce the consumption of treatment agent, and significantly improve the volume stability of steel slag aggregate for road use.

[0015] 2. This utility model adopts a closed-loop design. The acidification solution can be recycled after precipitation, filtration and ultraviolet catalysis, which reduces the consumption of acid and treatment costs, while ensuring uniform and stable treatment effect.

[0016] 3. This utility model realizes the automatic input, processing and output of steel slag; the concentration of the treatment agent is automatically detected and automatically replenished, which greatly reduces the need for manual operation and improves production efficiency and safety.

[0017] 4. This utility model combines multiple treatment processes such as precipitation, filtration and ultraviolet catalysis to effectively remove impurities and metal compounds from steel slag, ensure the purity of the treated liquid, and improve the effect of resource recovery.

[0018] 5. This utility model has good compatibility with existing mixing plants, can be flexibly applied to production environments of different scales, meet different process requirements, and promote the resource utilization and sustainable development of steel slag. Attached Figure Description

[0019] Figure 1 This is a system process flow diagram of this utility model.

[0020] Explanation of reference numerals in the attached figures

[0021] 1-Steel slag treatment plant, 2-Atomizing spray unit, 3-Sedimentation unit, 4-Ultraviolet catalysis unit, 5-Automatic replenishment unit, 6-Conveying pipe, 7-Input conveyor belt, 8-Output conveyor belt, 9-Primary sedimentation tank, 10-Secondary sedimentation tank, 11-Sediment discharge valve, 12-First filter, 13-Ultraviolet emitter, 14-Second filter, 15-Concentration detector, 16-Treatment liquid storage tank, 17-Transfer pump. Detailed Implementation

[0022] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0023] An innovative continuous and efficient production system for improving the volume stability of steel slag aggregate for road use includes a steel slag treatment plant 1, an atomizing spray unit 2, a sedimentation unit 3, an ultraviolet catalytic unit 4, and an automatic liquid replenishment unit 5. The front end of the steel slag treatment plant 1 is equipped with an input conveyor belt 7 and an output conveyor belt 8. The atomizing spray unit 2 is located above the steel slag treatment plant 1. The rear end of the steel slag treatment plant 1 is sequentially connected to the sedimentation unit 3 and the ultraviolet catalytic unit 4. Both the ultraviolet catalytic unit 4 and the automatic liquid replenishment unit 5 are connected to the atomizing spray unit 2 through a conveying pipe 6. A conveying pump 17 is installed on the conveying pipe 6.

[0024] The sedimentation unit 3 includes a primary sedimentation tank 9 and a secondary sedimentation tank 10 connected in sequence. Sediment discharge valves 11 are provided on the bottom sides of both the primary sedimentation tank 9 and the secondary sedimentation tank 10. The upper right side of the secondary sedimentation tank 10 is connected to the ultraviolet catalytic unit 4 through a first filter 12.

[0025] The ultraviolet catalytic unit 4 includes a catalytic tank and an ultraviolet emitter 13 disposed above the catalytic tank. A precipitate discharge valve 11 is disposed on the bottom side of the catalytic tank. The upper right side of the catalytic tank is connected to the automatic liquid replenishment unit 5 through a second filter 14.

[0026] The automatic replenishment unit 5 includes a treatment liquid storage tank 16, a concentration detector 15, and a delivery pump 17. The treatment liquid storage tank 16 replenishes the treatment liquid according to the concentration of the treatment liquid detected by the concentration detector 15. The treatment liquid of the automatic replenishment unit 5 is pumped to the atomizing spray unit 2 by the delivery pump 17.

[0027] The atomizing spray unit 2 includes several spray heads arranged in parallel. The spray heads are conical spray heads, which effectively improve the full contact between the treatment liquid and the steel slag and improve the acidification treatment efficiency.

[0028] The ultraviolet emitter 13 has an ultraviolet wavelength range of 300–400 nm and an irradiance range of 60–180 W / m. 2 , Enhance.

[0029] The working principle of this utility model is as follows:

[0030] 1) Converter slag raw materials with a particle size range of 0-32mm are sent to the slag treatment plant 1 via the input conveyor belt 7;

[0031] 2) Above the treatment site, activate the spray head of the atomizing spray unit to spray the treatment liquid evenly onto the surface of the steel slag in order to promote the stabilization reaction of the steel slag.

[0032] 3) The mixture of the treated liquid and the entrained steel slag powder after the reaction flows into the primary sedimentation tank 9 and the secondary sedimentation tank 10. The primary and secondary sedimentation tanks are equipped with sediment discharge valves 11 at the bottom to discharge the sediment regularly and ensure the effective operation of the sedimentation tanks. After passing through the first filter, the remaining solid insoluble matter is separated.

[0033] 4) After filtration, the treatment solution is placed in the catalytic tank of the ultraviolet catalytic unit 4. The ultraviolet emitter 13 is activated to perform ultraviolet catalytic treatment on the treatment solution, precipitating and removing some metal compounds in the treatment solution. Then, the solution is further filtered by the second filter 14 to remove impurities suspended in the solution, ensuring the purity of the treatment solution.

[0034] 5) The filtered treatment liquid enters the automatic treatment liquid replenishment unit 5 through the delivery pipe 6 for concentration detection and storage to ensure a stable supply of treatment liquid;

[0035] 6) The upper part of the automatic replenishment unit for the treatment liquid is connected back to the atomizing spray unit 2 through the treatment liquid delivery pipe 6, forming a closed-loop automatic circulation system to achieve the stabilization treatment of steel slag.

[0036] 7) The treated steel slag material is discharged via the output conveyor belt 8.

[0037] This invention uses an acidification treatment solution, which can maximize the contact area between the treatment solution and the steel slag, promote the reaction rate, reduce the consumption of treatment agents, and significantly improve the volume stability of steel slag aggregate for road use.

[0038] This invention adopts a closed-loop design, and the acidification solution can be recycled after precipitation, filtration and ultraviolet catalysis, reducing acid consumption and treatment costs, while ensuring uniform and stable treatment effect.

[0039] This invention enables the automatic input, processing, and output of steel slag; the treatment agent automatically detects its concentration and is automatically replenished, significantly reducing the need for manual operation and improving production efficiency and safety.

[0040] This invention combines multiple treatment processes, including sedimentation, filtration, and ultraviolet catalysis, to effectively remove impurities and metal compounds from steel slag, ensuring the purity of the treated liquid and improving the efficiency of resource recovery.

[0041] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A continuous and efficient production system for improving the volume stability of steel slag aggregate for road use, characterized in that: The system includes a steel slag treatment plant (1), an atomizing spray unit (2), a sedimentation unit (3), an ultraviolet catalysis unit (4), and an automatic liquid replenishment unit (5). The front end of the steel slag treatment plant (1) is equipped with an input conveyor belt (7) and an output conveyor belt (8). The atomizing spray unit (2) is located above the steel slag treatment plant (1). The rear end of the steel slag treatment plant (1) is connected to the sedimentation unit (3) and the ultraviolet catalysis unit (4) in sequence. The ultraviolet catalysis unit (4) and the automatic liquid replenishment unit (5) are both connected to the atomizing spray unit (2) through a conveying pipe (6). A conveying pump (17) is installed on the conveying pipe (6).

2. The continuous and efficient production system for improving the volume stability of steel slag aggregate for road use according to claim 1, characterized in that: The sedimentation unit (3) includes a primary sedimentation tank (9) and a secondary sedimentation tank (10) connected in sequence. Sediment discharge valves (11) are provided on the bottom side of both the primary sedimentation tank (9) and the secondary sedimentation tank (10). The upper right side of the secondary sedimentation tank (10) is connected to the ultraviolet catalytic unit (4) through a first filter (12).

3. The continuous and efficient production system for improving the volume stability of steel slag aggregate for road use according to claim 1, characterized in that: The ultraviolet catalytic unit (4) includes a catalytic tank and an ultraviolet emitter (13) disposed above the catalytic tank. A precipitate discharge valve (11) is disposed on the bottom side of the catalytic tank. The upper right side of the catalytic tank is connected to the automatic liquid replenishment unit (5) through a second filter (14).

4. The continuous and efficient production system for improving the volume stability of steel slag aggregate for road use according to claim 1, characterized in that: The automatic replenishment unit (5) includes a treatment liquid storage tank (16), a concentration detector (15), and a delivery pump (17). The treatment liquid storage tank (16) replenishes the treatment liquid according to the concentration of the treatment liquid detected by the concentration detector (15). The treatment liquid of the automatic replenishment unit (5) is pumped to the atomizing spray unit (2) by the delivery pump (17).

5. The continuous and efficient production system for improving the volume stability of steel slag aggregate for road use according to claim 1, characterized in that: The atomizing spray unit (2) includes several spray heads arranged in parallel, and the spray heads are conical spray heads.

6. The continuous and efficient production system for improving the volume stability of steel slag aggregate for road use according to claim 3, characterized in that: The ultraviolet emitter (13) has an ultraviolet wavelength range of 300–400 nm and an irradiance range of 60–180 W / m. 2 .

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