System and method for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching

Abstract

The present invention discloses a system and method for preparing spherical granular sand by using high-temperature liquid slag aerosol air quenching, which relates to the technical field of utilization of solid waste resources in the ferroalloy industry. The outlet end of the secondary diversion slag ditch is located in a closed air quenching chamber; a high-pressure atomizing nozzle is arranged below the outlet end of the secondary diversion slag ditch; the steam-water atomizer is connected with the high-pressure atomizing nozzle through an aerosol air quenching pipe; the tempered high-temperature slag overflows from the outlet end of the secondary diversion slag ditch and is broken up into spherical granular sand under the impact and rapid cooling of the aerosol sprayed by the high-pressure atomizing nozzle. After classification and screening, high-quality foundry sand, shot blasting sand and high-strength high-temperature resistant and wear-resistant plate aggregates are obtained. By directly using high-temperature liquid slag as raw material, the high-temperature slag is recycled in an energy-saving, environmentally friendly and efficient manner, and the obtained foundry sand, shot blasting sand and high-strength high-temperature resistant and wear-resistant plate aggregates have application performance equivalent to or better than that of similar products, and have remarkable economic benefits and energy-saving and environmental protection benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of utilization of solid waste resources in the ferroalloy industry, and particularly relates to a system and method for preparing spherical granular sand by using high-temperature liquid slag aerosol air quenching. Background Art

[0002] The smelting slag generated in non-ferrous metal smelting production contains metals such as iron, nickel, copper, manganese, chromium, and cobalt, and has high recycling value. At present, it is treated by water quenching or natural cooling of drained slag. Due to the chemical components such as magnesium in the slag, it cannot be widely used in cement production, with low utilization rate and large waste. There are a large number of stockpiles, causing significant environmental pollution.

[0003] Most of the production of foundry sand uses natural sand and other ores as raw materials, and the raw materials are melted by an electric furnace, resulting in high melting costs. With the increase in ore mining volume and low mining utilization rate, the mining of natural sand is gradually restricted by the state. With the improvement and development of the foundry industry technology level, the quality standards and demand for foundry sand are also continuously increasing.

[0004] On the one hand, the smelting slag generated from non-ferrous metal smelting cannot be effectively utilized. On the other hand, the manufacturing cost of foundry sand is high and the demand is large. If high-temperature liquid slag generated from alloy smelting is used as the raw material to produce foundry sand, multiple problems can be solved at once. Therefore, a method and system for preparing spherical granular sand (named after the process of "blown fly cooling and forming", which is essentially the same as foundry sand) by using high-temperature liquid slag aerosol air quenching are proposed. Summary of the Invention

[0005] Therefore, the present invention provides a system and method for preparing spherical granular sand by using high-temperature liquid slag aerosol air quenching to solve the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a system for preparing spherical granular sand by using high-temperature liquid slag aerosol air quenching, which includes:

[0008] A primary shunt slag ditch, a buffer tank, and a secondary shunt slag ditch connected in sequence, and the outlet end of the secondary shunt slag ditch is located in a closed air quenching chamber;

[0009] A conditioning agent bin located above the buffer tank and connected to it through a pipeline;

[0010] A high-pressure atomizing nozzle located below the outlet end of the secondary shunt slag ditch;

[0011] A steam-water atomizer connected to the high-pressure atomizing nozzle through an aerosol air quenching pipe;

[0012] Among them, the high-temperature liquid slag enters the buffer tank through the first-stage diversion slag ditch, is conditioned in the buffer tank, and after meeting the requirements of physical and chemical components, it enters the second-stage diversion slag ditch and flows to the closed air-quenching chamber; atomized gas with an air humidity of 120%-150%, a pressure of 0.8-0.9 MPa, a flow rate of not less than 16 Nm 3 / min and a flow velocity of not less than 8 m / s is ejected from N holes with a diameter of 2.0-3.0 mm on the high-pressure atomizing nozzle, directly impacting the high-temperature liquid slag overflowing from the outlet of the second-stage diversion slag ditch above, and the high-temperature liquid slag is broken up under the impact of this gas flow and in the state of rapid cooling, forming spherical granular sand when freely falling in the air, with a particle size of 8-160 mesh.

[0013] Furthermore, it also includes an axial flow fan arranged in the closed air-quenching chamber, and the axial flow fan is arranged at a position near the lower part of the side wall of the closed air-quenching chamber.

[0014] Furthermore, it also includes a rock wool collector arranged in the closed air-quenching chamber, and the rock wool collector is arranged at a position near the upper part of the side wall of the closed air-quenching chamber.

[0015] Furthermore, it also includes a heat-resistant plate conveyor and a heat-resistant cast steel deflector arranged in the closed air-quenching chamber. The heat-resistant plate conveyor is installed on the indoor horizontal ground, and the output end extends out of the wall. The heat-resistant cast steel deflector is installed above the heat-resistant plate conveyor and is set at 45° to the wall.

[0016] Furthermore, it also includes a grid vibrating screen, a heat-resistant bucket elevator and a high-level storage bin located outside the closed air-quenching chamber. The grid vibrating screen is located below the output end of the heat-resistant plate conveyor. The outlet of the grid vibrating screen is connected to the inlet of the heat-resistant bucket elevator, and the output end of the heat-resistant bucket elevator is connected to the inlet of the high-level storage bin.

[0017] Furthermore, it also includes an integrated multi-stage disk swing screen, a finished product bin and a ton bag packing machine outside the closed air-quenching chamber. The inlet of the integrated multi-stage disk swing screen is connected to the outlet of the high-level storage bin, the outlet of the integrated multi-stage disk swing screen is connected to the finished product bin, and the outlet of the finished product bin is connected to the inlet of the ton bag packing machine.

[0018] The second aspect of the present invention provides a method for preparing spherical granular sand by air mist quenching of high-temperature liquid slag, which uses the system provided in the first aspect of the present invention, and includes the following steps:

[0019] Step S1, online metering and controlling the diversion of the high-temperature liquid slag to the buffer tank;

[0020] Step S2, adding a conditioning agent to the buffer tank, conditioning and temperature measuring and detecting the high-temperature liquid slag, and after meeting the requirements of the physical and chemical components of the product, diverting it into the closed air-quenching chamber and overflowing;

[0021] Step S3, atomized gas with an air humidity of 120%-150%, a pressure of 0.8-0.9 MPa, a flow rate of not less than 16 Nm 3 / min and a flow velocity of not less than 8 m / s is ejected from N holes with a pore diameter of 2.0-3.0 mm on the high-pressure atomizing nozzle directly below the overflow port, directly impacting the high-temperature liquid slag overflowing from the outlet of the secondary diversion slag ditch above. The high-temperature liquid slag is broken up under the impact of this gas flow and in the state of rapid cooling, and forms spherical granular sand when freely falling in the air, with a particle size of 8-160 mesh.

[0022] Furthermore, the following steps are also included:

[0023] Step S4, assist in cooling the spherical granular sand during the free-falling process; meanwhile, during the air quenching process, recycle the rock wool scattered in the recovery chamber.

[0024] Furthermore, the following steps are also included:

[0025] Step S5, transport the spherical granular sand after steam mist air quenching outdoors;

[0026] Step S6, lift the spherical granular sand;

[0027] Step S7, classify and screen the spherical granular sand according to the particle mesh number to obtain high-quality foundry sand, shot blasting sand or high-strength high-temperature resistant and wear-resistant plate materials;

[0028] Step S8, package and store in the warehouse.

[0029] Furthermore,

[0030] In step S5, sieve before lifting to remove large particles;

[0031] In step S7, recycle the rock wool again before screening.

[0032] The present invention has the following advantages:

[0033] The system and method for preparing spherical granular sand by steam mist air quenching of high-temperature liquid slag of the present invention directly uses high-temperature liquid slag as raw material, does not need to use an electric furnace for smelting, saves the smelting cost. Steam mist air quenching is an important process step. By using steam mist to rapidly impact the overflowing high-temperature liquid slag, spherical granular sand is formed under the action of impact and rapid cooling, which can be used as the aggregate of shot blasting sand, foundry sand or high-temperature resistant and wear-resistant plates, thereby recycling nickel, chromium, silicon, manganese and other high-temperature slag energy-saving, environmentally friendly and efficiently. The quality of the obtained foundry sand, shot blasting sand and high-strength high-temperature resistant and wear-resistant materials is equivalent to or better than that of similar products, and has significant economic benefits and energy-saving and environmental protection benefits. Description of the Drawings

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0035] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0036] Figure 1 It is a schematic structural diagram of a system for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching provided by an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the aerosol air quenching related structure of a system for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching provided by an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the structure related to screening and warehousing of a system for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching provided by an embodiment of the present invention;

[0039] Figure 4 It is a floor plan of an enclosed air quenching chamber of a system for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching provided by an embodiment of the present invention. Detailed implementation manners

[0040] The following specific embodiments illustrate the implementation manners of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0041] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0042] Such as Figures 1 to 4As shown in the figure, this embodiment provides a system for preparing spherical granular sand by high-temperature liquid slag aerosol air quenching, which includes an electric furnace (submerged arc furnace) slag discharge channel flow control diverter, a closed aerosol air quenching cooling chamber, equipment supporting the closed aerosol air quenching cooling chamber, an aerosol air quenching sand conveying system, and a multi-stage screening system.

[0043] The electric furnace slag discharge channel flow control diverter includes: a primary diversion slag channel 9, a buffer package 10, a conditioning agent bin 11, a metering regulating valve 12, a temperature detector (not shown in the figure), and a secondary diversion slag channel 13. The inlet end of the primary diversion slag channel 9 is connected to the slag discharge channel 8 (which is connected to the slag outlet 7 of the electric furnace 1) of the electric furnace 1, and the outlet end is connected to the side inlet end of the buffer package 10; the outlet end of the buffer package 10 is connected to the secondary diversion slag channel 13 located in the closed aerosol air quenching cooling chamber, and there are multiple secondary diversion slag channels 13, which are arranged side by side; the conditioning agent bin 11 is located above the outside of the buffer package 10 and is connected to the buffer package 10 through a pipeline, and a metering regulating valve 12 is arranged on the pipeline. Under the control of this valve, the conditioning agent is transported to the buffer package 10 through the pipeline for precise feeding; the temperature detector is installed on the two walls of the buffer package 10.

[0044] The closed aerosol air quenching cooling chamber includes: a closed air quenching chamber 2, an air compressor (not shown in the figure), an air storage tank (not shown in the figure), a steam-water atomizer 14, an automatic detection and control device for the water content of the aerosol (not shown in the figure), a compressed air pipeline 15, a water pump (not shown in the figure), a water supply pipeline (not shown in the figure), an aerosol air quenching pipe 16, and a high-pressure atomizing nozzle (not shown in the figure). The closed air quenching chamber 2 is a light steel structure building; the air compressor, the air storage tank, and the water pump are not installed in the closed air quenching chamber 2. The air compressor blows air into the air storage tank to form a gas with a certain pressure in the air storage tank. The air storage tank is connected to the inlet of the steam-water atomizer 14 through the compressed air pipeline 15, and the water pump is connected to the inlet of the steam-water atomizer 14 through the water supply pipeline; the steam-water atomizer 14 is in the compartment of the closed air quenching chamber 2, and its outlet is connected to the inlet end of the high-pressure atomizing nozzle through the aerosol air quenching pipe 16; the high-pressure atomizing nozzle is installed 200 mm directly below the outlet of the secondary diversion slag channel 13, and the automatic detection and control device for the water content of the aerosol is installed on the steam-water atomizer 14.

[0045] The supporting equipment for the closed steam-mist air-quenching cooling chamber includes: heat-resistant sound insulation boards, axial flow fan 17, rock wool collector 18, heat-resistant cast steel deflector 19, and heat-resistant plate conveyor 20. Heat-resistant sound insulation boards are installed on the walls and roofs of the light steel structure building; the heat-resistant cast steel deflector 19 is installed above the heat-resistant plate conveyor 20 (without affecting the conveying function) and is set at a 45° angle to the wall surface, which has the function of rolling spherical particulate matter onto the heat-resistant plate conveyor 20; the heat-resistant plate conveyor 20 is installed on the indoor horizontal ground, and its output end extends about 1 m out of the wall; the axial flow fan 17 is installed at a lower position on the side wall of the closed air-quenching chamber 2; the rock wool collector 18 is installed at an upper position on the side wall of the closed air-quenching chamber 2.

[0046] The steam-mist air-quenching sand conveying system includes: grid vibrating screen 21, heat-resistant bucket elevator 24, high-level bin 4, rock wool air separator 27, electric control valve 26, and flexible connector 28. The grid vibrating screen 21 is installed below the output end of the heat-resistant plate conveyor 20. A receiving hopper 22 is connected below the screen of the grid vibrating screen 21, and a chute 23 connected to the receiving hopper 22 is provided. The output end of the chute 23 is connected to the inlet of the heat-resistant bucket elevator 24. The output end of the heat-resistant bucket elevator 24 is connected to the inlet of the high-level bin 4 through a downcomer 25. A discharge pipe is connected to the bottom of the high-level bin 4, and an electric control valve 26 is installed on the discharge pipe. The rock wool air separator 27 is installed below the discharge pipe, and the outlet of the rock wool air separator 27 is connected to the inlet end of the flexible connector 28.

[0047] The multi-stage screening system includes: integrated multi-stage disc shaker 5, finished product bin 6, and ton bag packing machine (not shown in the figure). The inlet end of the integrated multi-stage disc shaker 5 is connected to the outlet end of the flexible connector 28; the outlet ends of each stage of sieves are respectively connected to the inlet ends of different finished product bins 6 through downcomers 25, and the outlet of the finished product bin 6 is connected to the inlet end of the ton bag packing machine.

[0048] This embodiment also provides a method for preparing spherical granular sand by steam-mist air-quenching of high-temperature liquid slag, including the following steps:

[0049] The 1450 - 1650 °C high-temperature liquid slag produced by smelting nickel, chromium, silicon, and manganese alloys in an electric furnace (submerged arc furnace) is drained to a buffer bag through an on-line metering control of a primary diversion slag ditch. The high-temperature furnace slag is conditioned and temperature measured in the buffer bag. After meeting the requirements of the product's physical and chemical composition, it enters the secondary diversion slag ditch and overflows from the slag ditch outlet in the closed steam-mist air-quenching cooling chamber.

[0050] N holes with a diameter of 2.0 - 3.0 mm on the high-pressure atomizing nozzle directly below the outlet of the secondary diversion slag ditch spray out atomized air with a humidity of 120% - 150%, a pressure of 0.8 - 0.9 MPa, and a flow rate of not less than 16 Nm 3 / min (preferably 18 Nm3 Atomizing gas with a flow rate of not less than 8 m / s (preferably 10 m / s) per minute directly impacts the high-temperature liquid slag overflowing from the outlet of the secondary shunt slag ditch above. The high-temperature liquid slag is broken up under the impact of this gas flow and rapid cooling. When freely falling in the air, it forms spherical granular sand (shot blasting sand, foundry sand, or aggregate for high-temperature and wear-resistant plates), with a particle size of 8 - 160 mesh. After being assisted in cooling by an axial flow fan, the temperature rapidly drops from above 1400 °C to below 700 °C. During the air quenching process, the rock wool dispersed in the room is recovered by a collector.

[0051] The spherical granular sand after air atomization and quenching is transported outside the closed air quenching chamber by a heat-resistant cast steel deflector and a heat-resistant plate conveyor, and falls into a grid vibrating screen for primary screening to select particles larger than 8 mesh; the granular sand passing through the grid vibrating screen falls into a receiving hopper and enters a heat-resistant bucket elevator through a chute. The heat-resistant bucket elevator then transports the granular sand to a high-level storage bin. At this time, the temperature of the granular sand has dropped to below 300 degrees.

[0052] The granular sand in the high-level storage bin enters an integrated multi-stage disk swing screening machine through a blanking pipe and a flexible connector, and qualified products with a particle size of 8 - 160 mesh are screened out at one time according to the particle size grade. They enter a ton bag packing machine through a blanking pipe for packaging and warehousing. The remaining rock wool in the granular sand is completely captured when passing through the rock wool air separator installed on the blanking pipe in the high-level storage bin.

[0053] Important process parameters: 1. The temperature of the alloy slag must be controlled above 1400 °C to ensure the fluidity of the high-temperature slag, otherwise the yield is very low; 2. When the aperture of the high-pressure atomizing nozzle is less than 2.5 mm or greater than 3 mm, the uniformity of the size of the granular sand is poor and the qualification rate is low; 3. When the humidity of the atomizing air is less than 120%, the granular sand is prone to adhesion and the yield decreases; when the humidity of the atomizing air is greater than 150%, the strength of the granular sand will become low and it will break, not meeting the quality requirements; 4. The outlet pressure of the blowing holes of the high-pressure atomizing nozzle cannot be lower than 0.8 MPa, the flow rate cannot be lower than 8 m / s, and the flow rate cannot be lower than 16 Nm 3 / min, otherwise the impact and penetration of the atomizing blowing are poor, the high-temperature slag cannot be completely broken up, the granular sand does not form a round shape, and it cannot meet the quality requirements of the sand mold appearance.

[0054] In this embodiment, the conditioning agent generally uses kaolin, fluorite, Al2O3, and the conditioning agent is required to be prepared into 80-mesh powder particles.

[0055] Shot blasting sand does not require a preparation device and can be obtained only by selecting the mesh number of the spherical granular sand according to the use.

[0056] The preparation of high-temperature and wear-resistant plates is not within the scope of this application, and only the preparation of the aggregate is provided.

[0057] The basic chemical composition of the electric furnace smelting alloy slag is as follows.

[0058] The temperature of ferroalloy hot melt slag is generally between 1450 - 1650 °C, with good fluidity. Its general composition is as follows:

[0059] Component FeO MgO <![CDATA[SiO 2 > CaO <![CDATA[Al 2 O 3 > Ratio (%) 2～12 20～35 40～55 1～10 3～30

[0060] (1) Chemical composition table of the slag from the electric furnace (submerged arc furnace) for smelting nickel alloy

[0061] Component Ni Fe MgO <![CDATA[SiO 2 > CaO <![CDATA[Al 2 O 3 > Ratio (%) 0.02～0.05 3～18 26～30 45～55 1～4 3～6

[0062] (2) Chemical composition table of the oxidized slag from the electric furnace (submerged arc furnace) for smelting chromium alloy

[0063] Component <![CDATA[Fe 2 O 3 > MgO <![CDATA[SiO 2 > CaO <![CDATA[Al 2 O 3 > <![CDATA[Cr 2 O 3 > <![CDATA[Cr 6+ (mg / L)]]> Ratio (%) 1～3 22～24 29～31 2.5～3 30～33 3～8 0.001

[0064] The chemical composition of the granular sand product after conditioning the slag from the nickel alloy smelting furnace is as follows:

[0065] Component FeO MgO <![CDATA[SiO 2 > CaO <![CDATA[Al 2 O 3 > Ratio (%) 2～10 20～35 49～53 1～2 13～15

[0066] The performance indexes of the granular sand, shot blasting sand, and high - temperature resistant and wear - resistant products after conditioning the slag from the nickel alloy smelting furnace are as follows:

[0067]

[0068] The casting sand mold obtained by aerosol air quenching is spherical. The sphericity of the granular sand can reach more than 90%. The appearance is smooth and black - gray. Observed under a microscope, it has glass light transmittance and is dark green. Its thermophysical and chemical performance indexes, such as particle forming, thermochemical stability, thermal conductivity, heat storage characteristics, and thermal expansion coefficient, fully meet the quality requirements of the sand for casting.

[0069] The system and method for preparing spherical granular sand by aerosol air quenching of high - temperature liquid slag in the present invention directly use high - temperature liquid slag as raw materials without using electric furnace smelting, saving the smelting cost. Aerosol air quenching is an important process step. By using aerosol to rapidly impact the overflowing high - temperature liquid slag, spherical granular sand is formed under the action of impact and rapid cooling. It can be used as the aggregate of shot blasting sand, casting sand, or high - temperature resistant and wear - resistant plates, thus recycling nickel, chromium, silicon, manganese and other high - temperature slags energy - saving, environmentally friendly and efficiently. The quality of the obtained casting sand, shot blasting sand, and high - strength high - temperature resistant and wear - resistant materials is equivalent to or better than that of similar products, with significant economic benefits and energy - saving and environmental protection benefits.

[0070] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A system for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag, characterized in that, it includes: A primary shunt slag channel, a buffer package, and a secondary shunt slag channel connected in sequence. The outlet end of the secondary shunt slag channel is located inside the enclosed air quenching chamber; A conditioning agent bin located above the buffer package and connected to it through a pipeline; A high-pressure atomizing nozzle located below the outlet end of the secondary shunt slag channel; A steam-water atomizer connected to the high-pressure atomizing nozzle through a steam atomization air quenching pipe; Among them, the high-temperature liquid slag with a temperature not lower than 1400 °C enters the buffer package through the first-stage diversion slag ditch, is conditioned in the buffer package, and then enters the second-stage diversion slag ditch and flows towards the closed air quenching chamber after meeting the requirements of physical and chemical components; N high-pressure atomizing nozzles are arranged with N holes having a pore diameter of 2.0 - 3.0 mm, and atomized gas with an air humidity of 120% - 150%, a pressure of 0.8 - 0.9 MPa, a flow rate of not less than 16 Nm 3 / min and a flow velocity of not less than 8 m / s is ejected from the holes, directly impacting the high-temperature liquid slag overflowing from the outlet of the second-stage diversion slag ditch above. The high-temperature liquid slag is broken up under the impact of this gas flow and in the state of rapid cooling, and forms spherical granular sand with a particle size of 8 - 160 mesh when freely falling in the air; It also includes an axial flow fan arranged inside the enclosed air quenching chamber, and the axial flow fan is arranged at a position near the lower part of the side wall of the enclosed air quenching chamber; It also includes a rock wool collector arranged inside the enclosed air quenching chamber, and the rock wool collector is arranged at a position near the upper part of the side wall of the enclosed air quenching chamber.

2. The system for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag according to claim 1, characterized in that, It also includes a heat-resistant plate conveyor and a heat-resistant cast steel deflector arranged inside the enclosed air quenching chamber. The heat-resistant plate conveyor is installed on the indoor horizontal ground, and the output end extends out of the wall. The heat-resistant cast steel deflector is installed above the heat-resistant plate conveyor and is set at a 45° angle to the wall.

3. The system for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag according to claim 2, characterized in that, It also includes a grid vibrating screen, a heat-resistant bucket elevator, and a high-level storage bin located outside the enclosed air quenching chamber. The grid vibrating screen is located below the output end of the heat-resistant plate conveyor. The outlet of the grid vibrating screen is connected to the inlet of the heat-resistant bucket elevator, and the output end of the heat-resistant bucket elevator is connected to the inlet of the high-level storage bin.

4. The system for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag according to claim 3, characterized in that, It also includes an integrated multi-stage disc swing screen, a finished product bin, and a ton bag packaging machine located outside the enclosed air quenching chamber. The inlet of the integrated multi-stage disc swing screen is connected to the outlet of the high-level storage bin, the outlet of the integrated multi-stage disc swing screen is connected to the finished product bin, and the outlet of the finished product bin is connected to the inlet of the ton bag packaging machine.

5. A method for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag, characterized in that, using the system described in any one of claims 1-4, including the following steps: Step S1, online metering and controlling the drainage of high-temperature liquid slag with a temperature not lower than 1400°C into the buffer package; Step S2, adding a conditioning agent to the buffer package, conditioning and temperature measuring the high-temperature liquid slag. After meeting the requirements of the product's physical and chemical composition, drain it into the enclosed air quenching chamber and overflow; Step S3, there are N high-pressure atomizing nozzles arranged directly below the overflow port. Each nozzle is provided with N holes with a pore diameter of 2.0 - 3.0 mm. The atomized gas ejected from the holes has an air humidity of 120% - 150%, a pressure of 0.8 - 0.9 MPa, a flow rate of not less than 16 Nm 3 / min, and a flow velocity of not less than 8 m / s. It directly impacts the high-temperature liquid slag overflowing from the outlet of the secondary diversion slag ditch above. The high-temperature liquid slag is broken up under the impact of this air flow and in the state of rapid cooling, and forms spherical granular sand when freely falling in the air, with a particle size of 8 - 160 mesh; Step S4, assisting in cooling the spherical granular sand during the free fall process; at the same time, during the air quenching process, recover the rock wool scattered in the chamber; Step S5, transporting the steam atomization air quenched spherical granular sand out of the chamber; Step S6, lifting the spherical granular sand; Step S7, classifying and screening the spherical granular sand according to the particle mesh number to obtain high-quality foundry sand, shot blasting sand, or high-strength high-temperature resistant wear-resistant plate materials; Step S8, packaging and storing in the warehouse.

6. The method for preparing spherical granular sand by steam atomization air quenching of high-temperature liquid slag according to claim 5, characterized in that, In step S5, sieve to remove large particles before lifting; In step S7, before screening, the rock wool is recycled again.

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