Economical blast furnace slag treatment system

Abstract

The utility model relates to an economical blast furnace slag treatment system, and belongs to the technical field of slag treatment. According to the technical scheme, the bottom of the granulation tower is of an inverted-cone-shaped structure and is provided with a pneumatic elevator, one end of a slag outlet pipeline of the pneumatic elevator is connected with a slag outlet of an air pump, the other end of the slag outlet pipeline of the pneumatic elevator is connected with a dehydrator, a rotary drum is arranged in the dehydrator, and the bottom of the dehydrator is connected with a water pool through a dehydration water return pipeline. The granulating tower has the beneficial effects that a slag-water mixture generated by water quenching of molten slag in the granulating tower is directly conveyed to the dehydrator through the pneumatic elevator and the pipeline, and the separated water directly enters the water tank, so that the slag-water mixture with high concentration at the bottom is directly dehydrated under the condition of ensuring that the total slag discharge amount and the dehydration effect are basically unchanged; the dewatering efficiency of the slag-water mixture can be improved, and the technical effects of reducing the equipment type selection of the dewaterer, being small in investment, being more economical and being durable are achieved.

Description

Technical Field

[0001] The utility model relates to an economical blast furnace slag processing system, belonging to the technical field of slag processing. Background Art

[0002] Blast furnace slag is a solid waste formed during blast furnace smelting, consisting of gangue from ore, ash from fuel, and non-volatile components from solvents. Existing technologies for treating blast furnace slag typically utilize a water-slag method. A slag ditch and a scouring box within the granulation tower quench the molten slag, which then flows directly into a dehydration drum. After dehydration, the slag is transported by a belt conveyor. Examples include Chinese patents CN202321779448.9, entitled "A Metallurgical Slag Treatment System," and CN202311477396.4, entitled "Improved Blast Furnace Slag Treatment Device." This method boasts high blast furnace slag treatment efficiency and low moisture content in the finished slag. However, existing technologies require that all water and slag after granulation be directly processed by the dehydrator drum. This requires the drum to be tailored to the total amount of water and slag, resulting in a large drum size and high equipment investment, hindering the widespread application of this technology. Utility Model Content

[0003] The utility model aims to provide an economical blast furnace slag treatment system, which deposits granulated water and slag at the bottom of a granulation tower, and directly transports the slag and water mixture with high concentration at the bottom to a dehydrator for dehydration through an air hoist and a pipeline, and the separated water directly enters a water pool. While ensuring that the total slag discharge amount and the dehydration effect remain basically unchanged, the size of the dehydrator's drum is reduced, the investment is small, and it is more economical, thereby solving the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] An economical blast furnace slag processing system comprises a granulation tower, one side of which is provided with a slag ditch, and a punching box is provided below the slag ditch; the bottom of the granulation tower is an inverted cone structure and is provided with an air hoist, the air hoist comprising an air pump, a slag suction pipe and an air hoist slag discharge pipe, the top of the slag suction pipe is connected to the air pump, the bottom of the slag suction pipe is a slag inlet, and the slag inlet is arranged at the bottom of the inverted cone structure of the granulation tower, one end of the air hoist slag discharge pipe is connected to the slag discharge port of the air pump, and the other end is connected to a dehydrator, the dehydrator having a rotary drum inside, and the bottom of the dehydrator is connected to a water pool through a dehydration return pipe; the bottom of the granulation tower is provided with a granulation tower water slag bottom outlet, which is connected to the water pool through the granulation tower water slag bottom outlet pipe. The slag-water mixture produced by the slag water quenching in the granulation tower is deposited at the bottom of the inverted cone structure. The slag and water mixture with high concentration at the bottom is directly transported to the dehydrator through the air hoist, and the deposited water at the bottom is directly discharged into the water pool, which avoids the situation in the prior art where all the water and slag enter the dehydrator for dehydration, thereby reducing the total processing volume of the dehydrator. The slag-water mixture flowing into the dehydrator through the air hoist contains more slag and less water than the slag-water mixture flowing directly into the dehydrator through the granulation tower pipeline. Therefore, while ensuring a certain slag discharge volume and the same dehydration effect, the size of the dehydrator's drum can be reduced, thereby achieving a more economical effect of reducing the selection of dehydrator equipment and making a small investment.

[0006] Furthermore, an air lift stirring mechanism is provided near the slag inlet of the slag suction pipe. The air lift stirring mechanism comprises a main pipe, a ring pipe, and a nozzle. The main pipe is fixedly arranged along the slag suction pipe, with the top of the main pipe connected to a water pump and the bottom of the main pipe connected to the ring pipe. The ring pipe is arranged around the slag inlet and is equipped with multiple nozzles. The nozzles can be used to blow away the water slag that has long accumulated and adhered to the inverted conical structure of the granulation tower, preventing it from hardening and affecting normal operation, achieving a durable technical effect.

[0007] Furthermore, the multiple nozzles on the annular tube are evenly distributed along the annular tube, half of the nozzles are arranged obliquely upward and spray toward the inverted conical structure tower wall at the bottom of the granulation tower body, and the other half of the nozzles are arranged obliquely downward and spray toward the inverted conical structure tower wall at the bottom of the granulation tower body; the nozzles are arranged at intervals (one every other) toward obliquely upward and obliquely downward.

[0008] Furthermore, an electric valve is provided on the outlet pipe of the water slag at the bottom of the granulating tower, which is convenient for cleaning and storing the granulating tower when production is stopped.

[0009] Furthermore, a granulation tower overflow port is provided on one side of the granulation tower. The overflow port is located at a lower elevation than the punching box. The overflow port is connected to a granulation tower overflow pipe, which is connected to a water pool. The granulation tower overflow pipe, the granulation tower water slag bottom outlet pipe, and the dehydration return water pipe are all connected to the water pool.

[0010] The beneficial effects of the utility model are as follows: the slag-water mixture produced by the water quenching of the molten slag in the granulation tower is directly transported to the dehydrator through the air hoist and the pipeline, and the slag-water mixture with high concentration at the bottom is directly transported to the dehydrator, and the separated water directly enters the water pool. While ensuring that the total slag discharge amount and the dehydration effect remain basically unchanged, the dehydration efficiency of the slag-water mixture can be improved, thereby achieving the technical effects of reducing the selection of dehydrator equipment, making the investment small, more economical, and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0012] Figure 2 This is a structural diagram of the air lift stirring mechanism of an embodiment of the utility model;

[0013] Figure numerals: granulation tower 1, slag ditch 11, punching box 12, granulation tower overflow port 13, granulation tower water slag bottom outlet 14, air lift 15, slag inlet 151, slag outlet 152, air lift slag discharge pipe 2, granulation tower overflow pipe 3, granulation tower water slag bottom outlet pipe 4, electric valve 5, dehydrator 6, dehydration return pipe 7, water pool 8, air lift stirring mechanism 9, main pipe 91, nozzle 92, air pump 16, ring pipe 17. DETAILED DESCRIPTION

[0014] The present invention will be further described below through embodiments with reference to the accompanying drawings.

[0015] Refer to the attached Figure 1 and 2The present embodiment provides an economical blast furnace slag processing system, comprising a granulating tower 1, a slag ditch 11 is provided on one side of the granulating tower 1, and a punching box 12 is provided below the slag ditch 11; the bottom of the granulating tower 1 is an inverted cone structure and is provided with an air lift, the air lift comprises an air pump 16, a slag suction pipe 15 and an air lift slag discharge pipe 2, the top of the slag suction pipe 15 is connected to the air pump 16, the bottom of the slag suction pipe 15 is a slag inlet 151, and the slag inlet 151 is provided at the bottom of the inverted cone structure of the granulating tower 1, one end of the air lift slag discharge pipe 2 is connected to the slag discharge port 152 of the air pump 16, and the other end is connected to the dehydrator 6, the dehydrator 6 is provided with a rotary drum, and the bottom is connected to the water pool 8 through the dehydration return pipe 7; the bottom of the granulating tower 1 is provided with a granulating tower water slag bottom outlet 14, which is connected to the water pool 8 through the granulating tower water slag bottom outlet pipe 4. The slag-water mixture produced by the slag water quenching in the granulation tower is deposited at the bottom of the inverted cone structure. The slag-water mixture with high concentration at the bottom is directly transported to the dehydrator through the pneumatic lift, and the deposited water at the bottom is directly discharged into the water pool 8, thereby avoiding the problem in the prior art that all the water and slag enter the dehydrator for dehydration, thereby reducing the total processing volume of the dehydrator. The slag-water mixture flowing into the dehydrator through the pneumatic lift contains more slag and less water than the slag-water mixture flowing directly into the dehydrator through the granulation tower pipeline. Therefore, while ensuring a certain slag discharge volume and the same dehydration effect, the size of the dehydrator drum can be reduced, thereby achieving a more economical effect of reducing the selection of dehydrator equipment and reducing investment.

[0016] An air stripping and stirring mechanism 9 is provided adjacent to the slag inlet 151 of the slag suction pipe 15. The air stripping and stirring mechanism 9 comprises a main pipe 91, an annular pipe 17, and a nozzle 92. The main pipe 91 is fixedly arranged along the slag suction pipe 15. The top of the main pipe 91 is connected to a water pump, and the bottom of the main pipe 91 is connected to the annular pipe 17. The annular pipe 17 is arranged around the slag inlet 151 and is provided with a plurality of nozzles 92. The nozzles 92 can be used to sweep away water slag that has long accumulated and adhered to the inverted conical structure wall at the bottom of the granulating tower, preventing it from hardening and affecting normal operation, thereby achieving a durable technical effect.

[0017] The multiple nozzles 92 on the annular tube 17 are evenly distributed along the annular tube, half of the nozzles are arranged obliquely upward and spray toward the inverted conical structure tower wall at the bottom of the granulating tower 1, and the other half of the nozzles are arranged obliquely downward and spray toward the inverted conical structure tower wall at the bottom of the granulating tower 1; the nozzles are arranged at intervals (one every other) toward obliquely upward and obliquely downward.

[0018] The granulating tower water slag bottom outlet pipe 4 is provided with an electric valve 5. The granulating tower water slag bottom outlet pipe is provided with an electric valve 5, which is convenient for cleaning and storing the granulating tower when production is stopped.

[0019] A granulation tower overflow port 13 is provided on one side of the granulation tower 1. The elevation of the granulation tower overflow port 13 is lower than that of the punching box 12. The granulation tower overflow port 13 is connected to the granulation tower overflow pipe 3, which is connected to the water pool 8. The granulation tower overflow pipe 3, the granulation tower water slag bottom outlet pipe 4, and the dehydration return water pipe 7 are all connected to the water pool 8.

[0020] The working principle of the utility model is as follows: when the blast furnace slag slag chute flows into the granulation tower 1, the blast furnace slag is crushed into small particles under the action of the pressurized water sprayed by the punching box 12. The granulation tower 1 is provided with a granulation tower overflow port 13, and a granulation tower water slag bottom outlet pipe 4 is provided at the bottom. The two are connected to the water pool together with the dehydration return water pipe 7 for sedimentation. The granulation tower water slag bottom outlet pipe 4 is provided with an electric valve 5 to facilitate the cleaning and accumulation of the granulation tower 1 when production is stopped. The slag-water mixture produced by quenching the molten slag in the granulation tower 1 is directly transported to the dehydrator 6 via an air lift and pipeline, with the slag-water mixture at the bottom having a high concentration. This improves the dehydration efficiency of the slag-water mixture. Under the same slag-water ratio, the flow rate of the slag-water mixture flowing into the dehydrator 6 via the air lift is lower than that flowing directly from the granulation tower through the pipeline. However, the slag-water mixture flowing into the dehydrator 6 via the air lift contains more slag and less water than the slag-water mixture flowing directly from the granulation tower through the pipeline. In short, the flow rate is reduced, but the slag discharge volume remains unchanged. Therefore, while ensuring a certain slag discharge volume and the same dehydration effect, the type of dehydrator equipment can be reduced. This achieves the technical effect of reducing the type of dehydrator equipment, reducing investment and achieving a more economical and durable technical effect.

[0021] At the same time, an air lift stirring mechanism 9 is also provided around the pneumatic lifter to clear the water slag that has been accumulated on the conical tower wall at the bottom of the granulating tower for a long time, so as to prevent the slag from hardening and affecting normal work.

Claims

1. An economical blast furnace slag treatment system, characterized by: The invention comprises a granulating tower (1), wherein a slag groove (11) is provided on one side of the granulating tower (1), and a punching box (12) is provided below the slag groove (11); the bottom of the granulating tower (1) is an inverted cone structure and is provided with an air lift, the air lift comprises an air pump (16), a slag suction pipe (15) and an air lift slag discharge pipe (2), the top of the slag suction pipe (15) is connected to the air pump (16), the bottom of the slag suction pipe (15) is a slag inlet (151), and the inlet A slag outlet (151) is provided at the bottom of the inverted cone-shaped structure of the granulating tower (1); one end of the pneumatic lift slag outlet pipe (2) is connected to the slag outlet (152) of the air pump (16), and the other end is connected to the dehydrator (6); the dehydrator (6) is provided with a rotary drum, and the bottom is connected to the water pool (8) through the dehydration return pipe (7); the bottom of the granulating tower (1) is provided with a granulating tower water slag bottom outlet (14), which is connected to the water pool (8) through the granulating tower water slag bottom outlet pipe (4).

2. The economical blast furnace slag treatment system according to claim 1, characterized in that: An air stripping stirring mechanism (9) is provided next to the slag inlet (151) of the slag suction pipe (15). The air stripping stirring mechanism (9) comprises a main pipe (91), an annular pipe (17) and a nozzle (92). The main pipe (91) is fixedly arranged along the slag suction pipe (15). The top of the main pipe (91) is connected to a water pump, and the bottom of the main pipe (91) is connected to the annular pipe (17). The annular pipe (17) is arranged around the slag inlet (151), and a plurality of nozzles (92) are provided on the annular pipe (17).

3. An economical blast furnace slag treatment system according to claim 2, characterized in that: The plurality of nozzles (92) on the annular tube (17) are evenly spaced along the annular tube, with half of the nozzles arranged obliquely upwards to spray toward the inverted conical structure tower wall at the bottom of the granulating tower (1), and the other half of the nozzles arranged obliquely downwards to spray toward the inverted conical structure tower wall at the bottom of the granulating tower (1); the nozzles are arranged at intervals obliquely upwards and obliquely downwards.

4. An economical blast furnace slag treatment system according to claim 1 or 2, characterized in that: An electric valve (5) is provided on the bottom outlet pipe (4) of the granulation tower water slag.

5. An economical blast furnace slag treatment system according to claim 1 or 2, characterized in that: A granulation tower overflow port (13) is provided on one side of the granulation tower (1). The elevation of the granulation tower overflow port (13) is lower than the elevation of the punching box (12). The granulation tower overflow port (13) is connected to a granulation tower overflow pipe (3), and the granulation tower overflow pipe (3) is connected to the water pool (8).

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