Process for preparing sand mold material by using iron alloy smelting slag

Abstract

The invention relates to the technical field of molding sand preparation, in particular to a process for preparing a sand mold material by using iron alloy smelting slag, which comprises the following steps: S1, raw material pretreatment: crushing and screening the iron alloy smelting slag; the slag is dried for 2-4 hours at the temperature of 100-200 DEG C, and moisture is removed; s2, burdening: preparing the following raw materials in percentage by weight: 70-85% of iron alloy smelting slag; 5 to 10% of bentonite; 3-8% of water glass; 2-5% of phenolic resin; 5-10% of water; s3, mixing: putting the raw materials into a sand mixer according to a corresponding feeding channel, and mixing for 10-20 minutes at the rotating speed of 20-30 r / min until the mixture is uniform and has plasticity; s4, molding: filling the mixed mixture into a sand mold, and compacting and molding by adopting a vibrating compactor under the conditions that the frequency is 50-60 Hz and the pressure is 0.5-1.0 MPa to obtain a sand mold blank; s5, drying: drying the sand mold blank at 150-200 DEG C for 2-4 hours to obtain a sand mold material; and S6, carrying out post-treatment. And an environment-friendly molding sand material with good strength and fire resistance can be processed.

Description

Technical Field

[0001] The present invention relates to the technical field of molding sand preparation, and specifically to a process for preparing sand mold materials using ferroalloy smelting slag. Background Technique

[0002] Sand mold materials are indispensable basic materials in the casting industry and are widely used in the forming process of metal castings. Traditional sand mold materials are mainly prepared with natural quartz sand as the base material, supplemented with binders (such as bentonite, water glass, etc.). However, the mining and use of natural quartz sand not only consume a large amount of natural resources but also cause damage to the environment. In addition, the refractory performance and strength of traditional sand mold materials at high temperatures are often insufficient, resulting in problems such as poor surface quality and low dimensional accuracy of castings.

[0003] In recent years, with the increase in industrial solid waste, how to realize the resource utilization of waste has become a research hotspot. Ferroalloy smelting slag is a kind of solid waste generated during the ferroalloy smelting process, and its main components are silicate, calcium oxide, magnesium oxide, etc., which have high refractory performance and certain adhesiveness. However, the current utilization of ferroalloy smelting slag mainly focuses on fields such as cement and concrete, and there is less application research in sand mold materials. Although there have been some attempts to use smelting slag for the preparation of sand mold materials, the use ratio of the smelting slag is relatively low, and the problems of insufficient strength and refractory performance of the sand mold materials at high temperatures have not been solved. In addition, a single binder is mostly used in the existing technology, resulting in poor comprehensive performance of the sand mold materials and being difficult to meet the production requirements of high-precision castings. Moreover, the commonly used mixing equipment for the preparation of molding sand materials currently has insufficient mixing ability when mixing ferroalloy smelting slag and auxiliary materials, affecting the quality of the molding sand materials. Summary of the Invention

[0004] The purpose of the present invention is to provide a process for preparing sand mold materials using ferroalloy smelting slag, so as to achieve the purpose of producing environmentally friendly molding sand materials with good strength and refractory performance, and to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A process for preparing sand mold materials using ferroalloy smelting slag, including the following steps: S1, Raw material pretreatment: Crush and screen the ferroalloy smelting slag to obtain slag materials with a particle size ≤ 5 mm; Dry the slag materials at 100 - 200 °C for 2 - 4 hours to remove moisture; S2, Batching: Prepare the following raw materials by weight percentage: Ferroalloy smelting slag: 70 - 85%; Bentonite: 5 - 10%; Sodium silicate: 3 - 8%; Phenolic resin: 2 - 5%; Water: 5 - 10%; S3, Mixing: Put the raw materials into the sand mixer through the corresponding feeding channels, and mix at a rotational speed of 20 - 30 r / min for 10 - 20 minutes until the mixture is uniform and plastic; S4, Molding: Fill the mixed mixture into the sand mold, and compact and form it by a vibrating compactor under the conditions of a frequency of 50 - 60 Hz and a pressure of 0.5 - 1.0 MPa to obtain a sand mold blank; S5, Drying: Dry the sand mold blank at 150 - 200 °C for 2 - 4 hours to obtain a sand mold material; S6, Post - treatment: Conduct surface treatment on the dried sand mold material, and coat a refractory coating with a thickness of 0.1 - 0.3 mm. The refractory coating is composed of the following components by weight percentage: Aluminum oxide powder: 40 - 50%; Silica sol: 20 - 30%; Water: 20 - 30%.

[0006] Preferably, the sand mixer includes a barrel structure, which is assembled by a lower barrel and an upper barrel. A smelting slag inlet is provided in the middle of the upper barrel, and the sand mixer further includes: A main stirring structure, which is installed in the middle of the lower barrel; An auxiliary stirring structure, which is installed on both sides of the upper barrel; The main stirring structure includes a central shaft rotatably installed in the middle of the lower barrel, and four pusher rods are annularly installed on the central shaft. Scraping plates are provided at the ends of the pusher rods; The auxiliary stirring structure includes a water - material pipe and a solid - material pipe rotatably installed on both sides of the upper barrel, which are respectively used for feeding liquid auxiliary materials and solid auxiliary materials. Horizontal stirring rods and vertical stirring rods are respectively provided at the bottoms of the water - material pipe and the solid - material pipe; A horizontal dispersion pipe is connected to the middle of the water - material pipe, and the joint of the dispersion pipe and the water - material pipe is closed by a lift - type sealing plug; A dispersion box is installed in the lower barrel, and the solid - material pipe rotatably penetrates through the dispersion box and can be communicated with the dispersion box. A knocking - type pushing structure is provided on the dispersion box to push out the solid auxiliary materials; A shoveling structure is installed on the inner wall of the lower barrel for dispersing and spreading the materials; Driving structures are staggered on the pusher rods to alternately drive the sealing plug, the pushing structure, and the shoveling structure.

[0007] Preferably, a cavity is provided in the dispersion box, and a discharge port is provided on the side wall of the solid material pipe. When the solid material pipe rotates, the discharge port is intermittently communicated with the cavity. The pushing structure includes a boosting plate slidably installed in the cavity of the dispersion box, and the boosting plate is connected to a spring rod. A vertical hanging rod is connected to the boosting plate, and an inclined surface is provided at the bottom end of the hanging rod.

[0008] Preferably, the material shoveling structure includes a shaft seat installed on the inner wall of the lower barrel, a gear rotatably installed on the shaft seat, a turning seat coaxially connected to the gear, and a shovel bucket installed on the turning seat. And two material shoveling structures are symmetrically arranged in the lower barrel.

[0009] Preferably, the sealing plug is installed inside the water material pipe, and the sealing plug is connected to a closing seat. The closing seat is installed on a base at the bottom of the water material pipe through a top rod, and a mixing deviation is provided on the base. The base is slidably installed on the water material pipe through a lifting ring in a limited manner, and a horizontal stirring rod is annularly arranged on the lifting ring.

[0010] Preferably, the driving structure includes an arc-shaped seat installed in the middle of two symmetrically arranged pushing rods, and a central groove is provided in the arc-shaped seat. Convex rods are arrayed in the central groove.

[0011] Preferably, both ends of the arc-shaped seat are inclined, and the bottom of the base is provided with a rounded corner. When the arc-shaped seat passes through the position of the base, the base can be jacked up. When the arc-shaped seat passes under the dispersion box, the hanging rod is in the central groove, and the convex rod can alternately push the hanging rod.

[0012] Preferably, the driving structure further includes an assembly seat installed on the other two symmetrically arranged pushing rods, and the assembly seat is installed on the scraping wall plate. An arc-shaped rack is installed on the assembly seat, and the gear is on the rotation path of the arc-shaped rack.

[0013] Preferably, a central driving seat is provided at the bottom of the lower barrel to drive the central axis through the central driving seat. And a first side driving seat and a second side driving seat are respectively installed on both sides of the upper barrel to drive the water material pipe and the solid material pipe respectively.

[0014] Preferably, guiding grooves are communicated on both sides of the dispersion box, and the guiding grooves are inclined.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Using ferroalloy smelting slag in the preparation of sand mold materials increases the utilization ratio of the smelting slag, realizes the resource utilization of waste, reduces the dependence on natural resources such as natural quartz sand, reduces environmental damage, and through reasonable raw material formulations and processes, the prepared sand mold materials have excellent refractory properties, can meet the high-temperature requirements during the metal casting forming process, and at the same time have high strength, can meet the production requirements of high-precision castings. The combination of multiple binders significantly improves the comprehensive performance of the sand mold materials, making them more adaptable to complex casting process requirements.

[0016] 2. The muller used in the processing technology adopts a unique three-feed port design and the mutual cooperation of a main stirring structure, an auxiliary stirring structure, a material shoveling structure, a dispersion box and a driving structure, etc., which can fully mix the ferroalloy smelting slag and various auxiliary materials. Among them, the pushing rod and the scraping wall plate of the main stirring structure play a major role in mixing and stirring the materials, and the horizontal stirring rod and the vertical stirring rod of the auxiliary stirring structure assist in dispersing the materials. At the same time, the material shoveling structure can sprinkle the materials, and the dispersion box can evenly push out the solid auxiliary materials, and the liquid auxiliary materials can also be mixed with the materials under the action of centrifugal force, so that the solid auxiliary materials and the liquid auxiliary materials are just dispersed into the sprinkled materials when added, and the components of the mixed materials are evenly distributed, and the mixing effect is good, ensuring the quality of the sand mold materials. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the muller of the present invention.

[0018] Figure 2 It is a schematic diagram of the lower barrel structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the upper barrel structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the sand mixing structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the pushing rod structure of the present invention.

[0022] Figure 6 It is a schematic diagram of the bucket structure of the present invention.

[0023] Figure 7 It is a schematic diagram of the water pipe structure of the present invention.

[0024] Figure 8 It is a schematic diagram of the lifting type sealing plug structure of the present invention.

[0025] Figure 9 It is a schematic diagram of the solid material pipe structure of the present invention.

[0026] Figure 10This is a schematic diagram of the internal structure of the dispersion box of the present invention.

[0027] In the figure: 1, lower barrel; 2, upper barrel; 3, central drive seat; 4, central shaft; 5, pusher rod; 6, scraping wall plate; 7, first side drive seat; 8, water material pipe; 9, second side drive seat; 10, solid material pipe; 11, horizontal stirring rod; 12, vertical stirring rod; 13, dispersion pipe; 14, lifting ring; 15, base; 16, mixing piece; 17, ejector rod; 18, closing seat; 19, sealing plug; 20, dispersion box; 21, discharge port; 22, boosting plate; 23, spring rod; 24, suspension rod; 25, guiding groove; 26, arc seat; 27, central groove; 28, convex rod; 29, shaft seat; 30, gear; 31, flipping seat; 32, bucket; 33, material distributing tooth; 34, assembly seat; 35, arc rack. Specific embodiments

[0028] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments. It should be known that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. 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 of protection of the present invention.

[0029] Please refer to Figures 1 to 10 , the present invention provides a technical solution: a process for preparing sand mold materials using ferroalloy smelting slag, including the following steps: S1, raw material pretreatment: Crush and screen the ferroalloy smelting slag to obtain slag materials with a particle size ≤ 5 mm; Dry the slag materials at 100 - 200 °C for 2 - 4 hours to remove moisture; S2, batching: Prepare the following raw materials by weight percentage: Ferroalloy smelting slag: 70 - 85%; Bentonite: 5 - 10%; Sodium silicate: 3 - 8%; Phenolic resin: 2 - 5%; Water: 5 - 10%; S3, mixing: Put the raw materials into a sand mixer through the corresponding feeding channels and mix at a rotation speed of 20 - 30 r / min for 10 - 20 minutes until the mixture is uniform and plastic; S4, forming: Fill the mixed mixture into the sand mold, and use a vibration compactor to compact and form it under the conditions of a frequency of 50 - 60 Hz and a pressure of 0.5 - 1.0 MPa to obtain a sand mold blank; S5, Drying: Dry the sand mold blank at 150 - 200 °C for 2 - 4 hours to obtain a sand mold material; S6, Post-treatment: Perform surface treatment on the dried sand mold material, and coat a refractory coating with a thickness of 0.1 - 0.3 mm. The refractory coating is composed of the following components by weight percentage: Aluminum oxide powder: 40 - 50%; Silica sol: 20 - 30%; Water: 20 - 30%.

[0030] Example 1, Process for preparing sand mold material using ferroalloy smelting slag Raw material pretreatment: Crush the ferroalloy smelting slag, and use a jaw crusher to crush the smelting slag into particles with a particle size ≤ 5 mm. Dry the crushed smelting slag at 150 °C for 3 hours to remove moisture and obtain dried slag material.

[0031] Batching: Prepare the following raw materials by weight percentage: Ferroalloy smelting slag: 80%; Bentonite: 8%; Sodium silicate: 5%; Phenolic resin: 4%; Water: 8%.

[0032] Mixing: Add the above raw materials in proportion through the corresponding feeding channels of the sand mixer: The ferroalloy smelting slag enters through the smelting slag inlet; Bentonite and phenolic resin enter through the solid material pipe 10; Sodium silicate and water enter through the water material pipe 8.

[0033] Start the sand mixer, set the rotation speed to 25 r / min, and mix for 15 minutes until the mixture is uniform and plastic.

[0034] During the mixing process, the central axis 4 of the main stirring structure drives the pushing rod 5 and the scraping wall plate 6 to stir the materials, and the water material pipe 8 and the solid material pipe 10 of the auxiliary stirring structure disperse and mix the liquid and solid auxiliary materials through the horizontal stirring rod 11 and the vertical stirring rod 12.

[0035] The bucket 32 of the shoveling structure scatters and throws the materials. At the same time, the pushing structure in the dispersion box 20 evenly pushes out the solid auxiliary materials through the boosting plate 22, and the sealing plug 19 opens to allow the liquid auxiliary materials to be scattered, so that the auxiliary materials and the scattered materials first come into contact and mix to ensure uniform mixing.

[0036] Forming: Fill the mixed mixture into a sand mold, and use a vibration compactor to compact and form it under the conditions of a frequency of 55 Hz and a pressure of 0.8 MPa to obtain a sand mold blank.

[0037] Drying: Dry the sand mold blank at 180 °C for 3 hours to obtain a sand mold material.

[0038] Post-treatment: Perform surface treatment on the dried sand mold material and coat a refractory coating with a thickness of 0.2 mm. The composition of the refractory coating is: Aluminum oxide powder: 45%; Silica sol: 25%; Water: 30%.

[0039] Example 2, specific structure and working process of the sand mixer As Figures 1 - 4 shown, the sand mixer includes a barrel structure, which is assembled by a lower barrel 1 and an upper barrel 2. A smelting slag inlet is provided in the middle of the upper barrel 2. The sand mixer further includes: a main stirring structure installed in the middle of the lower barrel 1; an auxiliary stirring structure installed on both sides of the upper barrel 2; the main stirring structure includes a central shaft 4 rotatably installed in the middle of the lower barrel 1, and four pusher rods 5 are annularly installed on the central shaft 4. Scraping plates 6 are provided at the ends of the pusher rods 5; the auxiliary stirring structure includes a water material pipe 8 and a solid material pipe 10 rotatably installed on both sides of the upper barrel 2, which are respectively used for feeding liquid auxiliary materials and solid auxiliary materials. Horizontal stirring rods 11 and vertical stirring rods 12 are respectively provided at the bottoms of the water material pipe 8 and the solid material pipe 10; a horizontal dispersion pipe 13 is communicated in the middle of the water material pipe 8, and the joint of the dispersion pipe 13 and the water material pipe 8 is closed by a lifting sealing plug 19; a dispersion box 20 is installed in the lower barrel 1, and the solid material pipe 10 rotatably penetrates through the dispersion box 20 and can communicate with the dispersion box 20. A knocking type pushing structure is provided on the dispersion box 20 to push out the solid auxiliary materials; a shoveling structure is installed on the inner wall of the lower barrel 1 for dispersing and spreading the materials; driving structures are staggered on the pusher rods 5 to alternately drive the sealing plug 19, the pushing structure and the shoveling structure.

[0040] As Figures 1 - 3 shown, a central driving seat 3 is provided at the bottom of the lower barrel 1 to drive the central shaft 4 through the central driving seat 3. A first side driving seat 7 and a second side driving seat 9 are respectively installed on both sides of the upper barrel 2 to drive the water material pipe 8 and the solid material pipe 10 respectively.

[0041] The muller is designed with three feeding ports. The waste slag is directly added through the smelting slag feeding port in the middle of the upper barrel 2, while the auxiliary materials for molding sand preparation are added through the water pipe 8 and the solid material pipe 10 respectively. The water pipe 8 and the solid material pipe 10 adopt a rotating structure. After the liquid auxiliary material enters the water pipe 8, centrifugal dispersion feeding is adopted. When the inlet of the dispersion pipe 13 on it is opened, the liquid auxiliary material can be thrown out under the action of centrifugal force and mixed with the scattered materials. After the solid auxiliary material enters the solid material pipe 10, it falls into the dispersion box 20 and is dispersed into the scattered materials through the pushing structure in the dispersion box 20, avoiding the direct throwing out of the solid materials under the action of large centrifugal force and damaging the inner wall of the lower barrel 1.

[0042] As Figure 6 shown, the material shoveling structure includes a shaft seat 29 installed on the inner wall of the lower barrel 1, a gear 30 is rotatably installed on the shaft seat 29, a turning seat 31 is coaxially connected to the gear 30, a shovel 32 is installed on the turning seat 31, and two material shoveling structures are symmetrically arranged in the lower barrel 1. The driving structure includes an assembly seat 34 installed on the other two symmetrically arranged pushing rods 5, the assembly seat 34 is installed on the scraping wall plate 6, an arc-shaped rack 35 is installed on the assembly seat 34, and the gear 30 is on the rotation path of the arc-shaped rack 35.

[0043] In the present invention, the pushing rod 5 with the scraping wall plate 6 plays a main role in mixing and stirring the materials, and the rotating horizontal stirring rod 11 and vertical stirring rod 12 on both sides play an auxiliary dispersion effect on the materials. At the same time, a material shoveling structure capable of scattering the materials is also arranged in the lower barrel 1. When the pushing rod 5 rotates, the two arc-shaped racks 35 on it rotate to the position of the material shoveling structure, which can drive the gear 30, and then the turning seat 31 rotates, driving the shovel 32 to enter the materials, shoveling up the materials and throwing them upward during the rotation process, further promoting the uniform mixing of the materials. The shovel 32 is provided with a material dividing tooth 33 to help the shovel 32 enter the materials.

[0044] As Figure 9 、 Figure 10 shown, a cavity is arranged in the dispersion box 20, a discharge port 21 is arranged on the side wall of the solid material pipe 10, and when the solid material pipe 10 rotates, the discharge port 21 is intermittently communicated with the cavity. The pushing structure includes a boosting plate 22 slidably installed in the cavity of the dispersion box 20, the boosting plate 22 is connected to a spring rod 23, a vertical suspension rod 24 is connected to the boosting plate 22, and the bottom end of the suspension rod 24 is provided with an inclined surface. Guide grooves 25 are communicated on both sides of the dispersion box 20, and the guide grooves 25 are inclined.

[0045] As Figure 7 、 Figure 8As shown, the sealing plug 19 is installed inside the water and material pipe 8, and the sealing plug 19 is connected to the closed seat 18. The closed seat 18 is installed on the base 15 at the bottom of the water and material pipe 8 through the ejector rod 17. A mixing bias is provided on the base 15. The base 15 is installed on the water and material pipe 8 in a limited sliding manner through the lifting ring 14, and the horizontal stirring rod 11 is arranged annularly on the lifting ring 14.

[0046] As Figure 5 shown, the driving structure includes an arc-shaped seat 26 installed in the middle of two symmetric pushing rods 5. A central groove 27 is provided in the arc-shaped seat 26, and convex rods 28 are arrayed in the central groove 27. The two ends of the arc-shaped seat 26 are inclined, and the bottom of the base 15 is provided with a rounded corner. When the arc-shaped seat 26 passes through the position of the base 15, it can jack up the base 15. When the arc-shaped seat 26 passes under the dispersion box 20, the suspension rod 24 is in the central groove 27, and the convex rods 28 can alternately push the suspension rod 24.

[0047] When two of the pushing rods 5 rotate to the shoveling structure position, the other two pushing rods 5 just rotate under the water and material pipe 8 and the solid material pipe 10. Among them, on the pushing rod 5 that rotates under the water and material pipe 8, the provided arc-shaped seat 26 can generate a thrust force on the base 15, causing the base 15 to move upward. The position of the horizontal stirring rod 11 can be changed, improving the stirring effect. The mixing vanes 16 on the base 15 can also play a role in mixing and stirring. At the same time, the base 15 drives the ejector rod 17 to move upward, changing the position of the sealing plug 19, so that the feeding channel of the dispersion pipe 13 is opened. The liquid material therein can be dispersed and thrown out into the material under the action of centrifugal force. The closed seat 18 on the ejector rod 17 can limit the liquid material, preventing it from flowing to the lower part of the water and material pipe 8 and making it flow out concentrated at the position of the dispersion pipe 13. In addition, the solid auxiliary materials added to the solid material pipe 10 can enter the dispersion box 20 from the discharge port 21 and are on both sides of the boosting plate 22. On the pushing rod 5 that rotates under the solid material pipe 10, the provided multiple convex rods 28 can alternately contact the bottom of the suspension rod 24. When they contact, they first push the suspension rod 24 unilaterally, causing it to move against the elastic force of the spring. The boosting plate 22 in the dispersion box 20 is driven by the suspension rod 24 to move, pushing out the auxiliary materials on one side from the dispersion box 20 and making them disperse into the scattered material under the guidance of the guiding groove 25. Subsequently, when the suspension rod 24 moves to the limit position, the convex rod 28 can squeeze out from the inclined surface of the suspension rod 24. At this time, the suspension rod 24 moves to the other side under the elastic force of the spring, and the boosting plate 22 is used to push out the materials on the other side from the dispersion box 20. Therefore, when the multiple convex rods 28 pass by, the solid auxiliary materials in the dispersion box 20 can be quickly thrown to both sides and enter the scattered material, effectively ensuring that both the solid auxiliary materials and the liquid auxiliary materials can be quickly dispersed into the smelting slag. The suspension rod 24 is a vulnerable part and needs to be replaced regularly.

[0048] Example 3, Preparation and Coating of Refractory Coating Preparation of refractory coating: Weigh 45% of alumina powder, 25% of silica sol and 30% of water by weight percentage, and mix them evenly to obtain the refractory coating.

[0049] Coating process: Evenly coat the refractory coating on the surface of the sand mold material, and the coating thickness is 0.2 mm.

[0050] After coating, dry the sand mold material at 150 °C for 1 hour to cure the refractory coating.

[0051] Example 4, Performance Testing of Sand Mold Material Refractory performance testing: Heat the prepared sand mold material in a high-temperature furnace to 1500 °C and keep it for 2 hours, and observe its surface state. The results show that there are no obvious cracks and burns on the surface of the sand mold material, and its refractory performance is excellent.

[0052] Strength testing: Use a universal testing machine to test the compressive strength of the sand mold material. The results show that its compressive strength is 8.5 MPa, meeting the production requirements of high-precision castings.

[0053] Mixing uniformity testing: Take samples of the mixed materials for analysis. The results show that the distribution of each component is uniform and the mixing effect is good.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing sand mold materials using ferroalloy smelting slag, characterized in that: It includes the following steps: S1, Raw material pretreatment: Crush and screen the ferroalloy smelting slag to obtain slag materials with a particle size ≤ 5 mm; Dry the slag materials at 100 - 200 °C for 2 - 4 hours to remove moisture; S2, Batching: Prepare the following raw materials by weight percentage: Ferroalloy smelting slag: 70 - 85%; Bentonite: 5 - 10%; Sodium silicate: 3 - 8%; Phenolic resin: 2 - 5%; Water: 5 - 10%; S3, Mixing: Put the raw materials into the sand mixer through the corresponding feeding channels and mix at a rotation speed of 20 - 30 r / min for 10 - 20 minutes until the mixture is uniform and plastic; S4, Molding: Fill the mixed mixture into the sand mold, and use a vibration compactor to compact and form it under the conditions of a frequency of 50 - 60 Hz and a pressure of 0.5 - 1.0 MPa to obtain a sand mold blank; S5, Drying: Dry the sand mold blank at 150 - 200 °C for 2 - 4 hours to obtain a sand mold material; S6, Post-treatment: Perform surface treatment on the dried sand mold material, and coat a refractory coating with a thickness of 0.1 - 0.3 mm. The refractory coating is composed of the following components by weight percentage: Aluminum oxide powder: 40 - 50%; Silica sol: 20 - 30%; Water: 20 - 30%.

2. The process for preparing a sand mold material using ferroalloy smelting slag according to claim 1, wherein: The sand mixer includes a barrel structure, which is assembled by a lower barrel and an upper barrel. The middle of the upper barrel is provided with a smelting slag inlet, and the sand mixer further includes: A main stirring structure, which is installed in the middle of the lower barrel; An auxiliary stirring structure, which is installed on both sides of the upper barrel; The main stirring structure includes a central shaft rotatably installed in the middle of the lower barrel, and four pushing rods are annularly installed on the central shaft. Scraping plates are arranged at the ends of the pushing rods; The auxiliary stirring structure includes a water material pipe and a solid material pipe rotatably installed on both sides of the upper barrel, which are respectively used for feeding liquid auxiliary materials and solid auxiliary materials. Horizontal stirring rods and vertical stirring rods are respectively arranged at the bottoms of the water material pipe and the solid material pipe; The middle of the water material pipe is connected to a horizontal dispersion pipe, and the joint of the dispersion pipe and the water material pipe is closed by a lifting type sealing plug; A dispersion box is installed in the lower barrel, and the solid material pipe rotatably penetrates through the dispersion box and can be communicated with the dispersion box. A knocking type pushing structure is arranged on the dispersion box to push out the solid auxiliary materials; A shoveling structure is installed on the inner wall of the lower barrel for dispersing and spreading the materials; Drive structures are alternately arranged on the pushing rods to alternately drive the sealing plug, the pushing structure and the shoveling structure.

3. The process for preparing a sand mold material using ferroalloy smelting slag according to claim 2, characterized in that: A cavity is arranged in the dispersion box, and a discharge port is arranged on the side wall of the solid material pipe. When the solid material pipe rotates, the discharge port is intermittently communicated with the cavity. The pushing structure includes a boosting plate slidably installed in the cavity of the dispersion box, and the boosting plate is connected to a spring rod. A vertical suspension rod is connected to the boosting plate, and an inclined surface is arranged at the bottom end of the suspension rod.

4. A process for preparing sand mold materials using ferroalloy smelting slag according to claim 3, characterized in that: The material shoveling structure includes a shaft seat installed on the inner wall of the lower barrel. A gear is rotatably installed on the shaft seat, and a turning seat is coaxially connected to the gear. A bucket is installed on the turning seat, and two material shoveling structures are symmetrically arranged in the lower barrel.

5. The process for preparing a sand mold material using ferroalloy smelting slag according to claim 4, characterized in that: The sealing plug is installed inside the water and material pipe, and the sealing plug is connected to the closing seat. The closing seat is installed on the base at the bottom of the water and material pipe through a push rod, and a mixing deviation is provided on the base. The base is installed on the water and material pipe in a limited sliding manner through a lifting ring, and a horizontal stirring rod is annularly arranged on the lifting ring.

6. The process for preparing a sand mold material using ferroalloy smelting slag according to claim 5, characterized in that: The driving structure includes an arc-shaped seat installed in the middle of two symmetrically arranged pushing rods, and a central groove is provided in the arc-shaped seat. A plurality of convex rods are arrayed in the central groove.

7. A process for preparing a sand mold material using ferroalloy smelting slag according to claim 6, characterized in that: Both ends of the arc-shaped seat are inclined, and the bottom of the base is provided with a rounded corner. When the arc-shaped seat passes through the position of the base, it can jack up the base. When the arc-shaped seat passes below the dispersion box, the suspension rod is in the central groove, and the convex rods can alternately push the suspension rod.

8. A process for preparing a sand mold material using ferroalloy smelting slag according to claim 7, characterized in that: The driving structure further includes an assembly seat installed on the other two symmetrically arranged pushing rods, and the assembly seat is installed on the scraping wall plate. An arc-shaped rack is installed on the assembly seat, and the gear is on the rotation path of the arc-shaped rack.

9. A process for preparing a sand mold material using ferroalloy smelting slag according to claim 2, characterized in that: The bottom of the lower barrel is provided with a central driving seat, and the central shaft is driven through the central driving seat. On both sides of the upper barrel, a first side driving seat and a second side driving seat are respectively installed, and they respectively drive the water and material pipe and the solid material pipe.

10. The process for preparing a sand mold material using ferroalloy smelting slag according to claim 3, characterized in that: Guiding grooves are communicated on both sides of the dispersion box, and the guiding grooves are inclined.

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