CN113426942A - Method for preparing precoated sand for cast steel from recycled material - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a method for preparing precoated sand for cast steel by using a regenerated material, which uses the regenerated sand obtained by regenerating waste cast steel sand as an aggregate, and can recycle the waste sand because the thermal expansion coefficient and the mud content of the regenerated sand are both reduced to low points and the high-temperature resistance is far better than that of the currently used common silica sand.
Description
Technical Field
The invention belongs to the technical field of precoated sand, and particularly relates to a method for preparing precoated sand for cast steel from a recycled material.
Background
The precoated sand is mainly prepared by taking quartz sand, ceramsite sand and jewel sand as raw sand, thermoplastic phenolic resin as a binder, urotropine as a curing agent and adding a reinforcing agent. The sand core has great advantages in sand core production efficiency, stripping property, fluidity, collapsibility and casting surface finish, and is one of the best molding materials for automobile parts, hydraulic parts and the like.
The steel casting is usually cast by water glass sand or molten film, but because the water glass sand is poor in collapse and dispersion, the casting is difficult to clean, the molten film casting cost is relatively high, and the precoated sand is gradually and widely applied to the production of the steel casting. Because the casting temperature of the steel casting is high (more than 1500 ℃), the refractoriness of the common precoated sand is insufficient, the serious sand-sticking defect can occur, although the refractoriness can be improved by adopting the high-silica precoated sand, the vein defect can be caused by larger expansion, and the cost of adopting the jewel sand to precoated sand is too high. Therefore, in consideration of cost and casting performance, the steel casting coated sand is generally produced by adding a high-temperature resistant auxiliary agent into common coated sand at present.
The steel casting old sand refers to alkali phenolic resin old sand and water glass old sand discharged by a foundry, millions of tons of waste sand are generated every year in China, direct discharge pollutes the environment, the supervision of solid waste discharge is more and more strict, and the nation strongly supports the recycling of the solid waste. The main components of the alkali phenolic resin used sand are silicon dioxide, alkali phenolic resin, aluminum oxide, ferric oxide and the like; the used sodium silicate sand mainly comprises silicon dioxide, sodium silicate and micro silicon powder.
CN10216237A discloses an additive for steel casting precoated sand, a preparation method and an application thereof, wherein the additive comprises the following raw materials in parts by weight: 10-60 parts of heat-resistant agent, 5-30 parts of flux and 1-20 parts of fluxing agent. The heat-resistant agent consists of graphite powder, titanium dioxide and aluminum oxide, and the weight ratio of the graphite powder to the titanium dioxide to the aluminum oxide is 2-4:1-3: 4-6; the flux consists of silicon dioxide and magnesium oxide, and the weight ratio of the silicon dioxide to the magnesium oxide is 0.5-1.5: 3-5; the fluxing agent is potassium nitrate, sodium nitrate, potassium carbonate, sodium sulfate, potassium sulfate or calcium oxide.
CN112589042A discloses an additive for steel casting precoated sand, a preparation method and an application thereof, wherein the additive comprises the following raw materials in parts by weight: 80-100 parts of silicon micropowder, 20-30 parts of titanium dioxide micropowder, 10-20 parts of glass fiber powder, 10-15 parts of chloropropene grinding powder, 6-10 parts of fluorocarbon surfactant and 10-15 parts of silicone oil.
CN112517835A discloses a novel high-temperature resistant type cast steel precoated sand and a preparation process, the formula comprises: the composition comprises Dalin sand, phenolic resin, urotropine, calcium stearate and an additive, wherein the components in parts by weight are as follows: 249-251 parts of Dalin sand, 2.5-12.5 parts of phenolic resin, 0.375-1.875 parts of urotropin, 0.15-0.75 part of calcium stearate and 0.15-0.75 part of additive.
The above patents disclosed in the prior art all adopt common raw sand or special sand, and the high temperature performance is improved by adding a high temperature resistant additive to obtain the precoated sand for cast steel. The cost of the new sand and the special sand is high, the environment is not protected, the additive with multi-component combination is complex, the uniformity is difficult to ensure during production, and the quality fluctuation of the steel casting precoated sand is easy to cause; in addition, more additives in the market can be decomposed at high temperature to generate gas, and the pore tendency of the surface of the casting is increased.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for preparing precoated sand for cast steel by using a regenerated material, the method can fully utilize waste sand, and a refractory prepared by granulating waste water and sludge has better fluidity and high temperature resistance, thereby realizing the recycling of resources and improving the high temperature resistance of the precoated sand.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing precoated sand for cast steel from recycled materials, the method comprising the steps of:
(1) regenerating the waste steel casting sand by adopting a hot method and a wet method, collecting waste water generated in the regeneration process, and performing flocculation precipitation on the waste water to obtain regenerated sand, waste water and sludge;
(2) mixing the wastewater and the sludge, and performing ultrasonic activation treatment to obtain mixed slurry with the viscosity of 200-500 mPa & s;
(3) granulating and roasting the mixed slurry, the magnesium oxide and the zircon powder to obtain a refractory agent;
(4) and (2) centrifugally selecting the reclaimed sand obtained in the step (1) to remove impurities, sequentially adding the refractory, phenolic resin, urotropine aqueous solution and calcium stearate, and cooling to obtain the coated sand for cast steel.
According to the invention, the waste sand is regenerated by adopting a hot method and a wet method, the obtained regenerated sand is calcined at high temperature, the thermal expansion coefficient is low, the surface mud content is low by wet scrubbing, and the sodium silicate remained on the surface of the regenerated sand can be vitrified at the high temperature of cast steel pouring, so that the high temperature resistance of the steel casting precoated sand can be greatly improved by taking the regenerated sand prepared by the method as an aggregate.
The method comprises the steps of scrubbing by a wet method to remove aluminum oxide, chromium oxide, sodium silicate and micro silicon powder on the surface of waste sand, obtaining waste water and sludge by flocculation precipitation, wherein the main components of the waste water comprise 90-96% of water and 2-8% of sodium silicate, the main components of the sludge comprise silicon dioxide, aluminum oxide, chromium oxide and micro silicon powder, mixing the waste water and the sludge in a ratio, activating the mixture by ultrasound to prepare slurry with certain viscosity, and adding magnesium oxide and zircon powder for granulation to prepare the refractory agent.
Further, the waste steel casting sand in the step (1) is formed by mixing 60-80 parts of used alkali phenolic resin sand and 20-40 parts of used water glass sand, the hot method temperature is 300-800 ℃, and the wet scrubbing is carried out for 10-60 min.
Further, 5-10 parts of wastewater and 5-10 parts of sludge in the step (2) by weight.
Further, in the step (2), the ultrasonic frequency is 20-60KHz, and the activation time is 10-30 min.
Further, in the step (2), the viscosity of the mixed slurry is tested, if the viscosity is less than 200 mPas, 1 part of the sludge is continuously added, the activation time is prolonged for 8-12min, and if the viscosity is more than 500 mPas, 1 part of the waste water is continuously added, and the activation time is prolonged for 8-12min, until the mixed slurry with the viscosity of 200 mPas-500 mPas is obtained.
Further, according to the parts by weight, 5-10 parts of mixed slurry, 1-2 parts of magnesium oxide and 3-5 parts of zircon powder in the step (3).
Further, the particle size after granulation in the step (3) is 200-270 meshes, the roasting temperature is 800-1000 ℃, and the roasting time is 2-6 h.
Further, the centrifugal rotation speed in the step (4) is 3600-.
Further, 100 parts of reclaimed sand carefully selected in the step (4), 2-5 parts of a refractory, 1-3 parts of phenolic resin, 0.1-0.5 part of urotropine aqueous solution and 0.05-0.1 part of calcium stearate by weight.
Further, adding the refractory, the phenolic resin, the urotropine aqueous solution and the calcium stearate into the reclaimed sand after selection in the step (4) to be stirred, adding the refractory to be stirred for 5-15s, adding the phenolic resin to be stirred for 10-30s, adding the urotropine aqueous solution to be stirred for 30-45s, adding the calcium stearate to be stirred for 30-40 s.
The mass fraction of the urotropine in the urotropine aqueous solution is 40-55%.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes the waste steel casting sand to obtain the reclaimed sand as the aggregate through regeneration, because the reclaimed sand is regenerated through a thermal method and a wet method, the thermal expansion coefficient and the mud content are both reduced to low points, the high temperature resistance is far superior to the prior common silica sand, and the waste sand can be recycled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of preparing precoated sand for cast steel from reclaimed materials according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
A flow chart of a method for preparing precoated sand for cast steel from recycled materials in an embodiment of the present invention is shown in fig. 1.
Example 1
A method for preparing precoated sand for cast steel from recycled materials, the method comprising the steps of:
(1) the method comprises the following steps of regenerating the waste cast steel sand by adopting a hot method and a wet method, wherein the waste cast steel sand is formed by mixing 70kg of old alkali phenolic resin sand and 30kg of old water glass sand, the hot method temperature is 600 ℃, the wet method is used for scrubbing for 20min, the sand is dehydrated and dried, the waste water generated in the regeneration process is collected, and the waste water is subjected to flocculation precipitation to obtain regenerated sand, waste water and sludge;
(2) mixing 6kg of wastewater and 8kg of sludge, and putting the mixture into an ultrasonic activation box for ultrasonic activation treatment, wherein the ultrasonic frequency is 40KHz, and the activation time is 20min, so as to obtain mixed slurry with the viscosity of 400mPa & s;
(3) putting 8kg of the mixed slurry, 1kg of magnesium oxide and 5kg of zircon powder into a disc granulator for granulation, sieving spherical particles with the particle size of 200 plus 270 meshes (the spherical particles are crushed after being coarse and are taken as raw materials to be mixed back for continuous granulation after being fine) at the disc inclination angle (included angle with the horizontal direction) of 30 ℃ and the disc rotating speed of 24r/min, and putting the spherical particles into a roasting furnace for roasting at the roasting temperature of 800 ℃ for 2 hours to obtain a refractory;
(4) and (2) carrying out centrifugal selection on the reclaimed sand obtained in the step (1) to remove impurities, carrying out centrifugal selection at a rotating speed of 3600r/min for 5min, heating 100 parts of the selected reclaimed sand to 150 ℃, putting the heated reclaimed sand into a precoated sand mixer, sequentially adding 3 parts of a refractory, stirring for 10s, adding 2 parts of phenolic resin, stirring for 20s, adding 0.2 part of urotropine aqueous solution, stirring for 38s, adding 0.08 part of calcium stearate, stirring for 35s, discharging and cooling to obtain the precoated sand for cast steel.
Example 2
A method for preparing precoated sand for cast steel from recycled materials, the method comprising the steps of:
(1) regenerating waste steel casting sand by adopting a hot method and a wet method, wherein the waste steel casting sand is formed by mixing 60kg of old alkali phenolic resin sand and 40kg of old water glass sand, the hot method temperature is 300 ℃, the wet method is used for scrubbing for 60min, the sand is dehydrated and dried, the waste water generated in the regeneration process is collected, and the waste water is subjected to flocculation precipitation to obtain regenerated sand, waste water and sludge;
(2) mixing 5kg of wastewater and 10kg of sludge, putting the mixture into an ultrasonic activation box for ultrasonic activation treatment, wherein the ultrasonic frequency is 20KHz, the activation time is 30min, so as to obtain mixed slurry with the viscosity of 560mPa & s, continuously adding 1kg of wastewater, and continuously activating for 10min, so as to obtain mixed slurry with the viscosity of 479mPa & s;
(3) placing 5kg of the mixed slurry, 2kg of magnesium oxide and 3kg of zircon powder into a disc granulator for granulation, sieving spherical particles with the particle size of 200 plus 270 meshes (the spherical particles are crushed after being coarse and are used as raw materials to be mixed back for continuous granulation after being fine) at the disc inclination angle (included angle with the horizontal direction) of 30 ℃ and the disc rotating speed of 24r/min, and placing the spherical particles into a roasting furnace for roasting at the roasting temperature of 900 ℃ for 4 hours to obtain a refractory;
(4) and (2) carrying out centrifugal selection on the reclaimed sand obtained in the step (1) to remove impurities, carrying out centrifugal selection at the rotating speed of 4800r/min for 10min for centrifugation, heating 100 parts of the selected reclaimed sand to 150 ℃, putting the heated reclaimed sand into a precoated sand mixer, sequentially adding 2 parts of a refractory, stirring for 5s, adding 3 parts of phenolic resin, stirring for 10s, adding 0.1 part of urotropine aqueous solution, stirring for 30s, adding 0.05 part of calcium stearate, stirring for 30s, discharging and cooling to obtain the precoated sand for cast steel.
Example 3
A method for preparing precoated sand for cast steel from recycled materials, the method comprising the steps of:
(1) the method comprises the following steps of regenerating the waste cast steel sand by adopting a hot method and a wet method, wherein the waste cast steel sand is formed by mixing 80kg of old alkali phenolic resin sand and 20kg of old sodium silicate sand, the hot method temperature is 800 ℃, the wet method scrubbing is carried out for 10min, the sand is dehydrated and dried, the waste water generated in the regeneration process is collected, and the waste water is subjected to flocculation precipitation to obtain regenerated sand, waste water and sludge;
(2) mixing 10kg of wastewater and 5kg of sludge, putting the mixture into an ultrasonic activation box for ultrasonic activation treatment, wherein the ultrasonic frequency is 60KHz, the activation time is 10min, so as to obtain mixed slurry with the viscosity of 180mPa & s, continuously adding 1kg of slurry, and activating for 10min, so as to obtain mixed slurry with the viscosity of 275mPa & s;
(3) 10kg of the mixed slurry, 1.5kg of magnesium oxide and 4kg of zircon powder are put into a disc granulator for granulation, the disc inclination angle (included angle with the horizontal direction) is 30 degrees, the disc rotation speed is 24r/min, spherical particles with the particle size of 200 plus 270 meshes (the spherical particles are crushed after being coarse and are taken as raw materials to be mixed back for continuous granulation) are screened, and the spherical particles are put into a roasting furnace for roasting at the roasting temperature of 1000 ℃ for 6 hours to obtain a refractory;
(4) and (2) carrying out centrifugal selection on the reclaimed sand obtained in the step (1) to remove impurities, heating 100 parts of the selected reclaimed sand to 150 ℃, then putting the reclaimed sand into a precoated sand mixer, sequentially adding 5 parts of a refractory, stirring for 15s, adding 1 part of phenolic resin, stirring for 30s, adding 0.5 part of urotropine aqueous solution, stirring for 45s, adding 0.1 part of calcium stearate, stirring for 40s, discharging and cooling to obtain the precoated sand for cast steel.
Comparative example 1
The precoated sand of this comparative example was prepared in the same manner as in example 1, except that no used water glass sand was added in step (1).
Comparative example 2
The precoated sand of this comparative example was prepared in the same manner as in example 1, except that the ultrasonic activation treatment was not performed in step (2), and only the ordinary stirring treatment was employed.
Comparative example 3
The precoated sand of this comparative example was prepared in the same manner as in example 1, except that the reclaimed sand in step (4) was not subjected to centrifugal dressing.
Comparative example 4
The precoated sand preparation method of this comparative example was the same as in example 1, except that the cast steel waste sand in step (1) was replaced with inner cover baked sand.
Comparative example 5
The preparation method of the precoated sand in the comparative example is the same as that in example 1, except that the refractory is replaced by a mixture of silicon micropowder, titanium dioxide micropowder, glass fiber powder, chloropropene grinding powder, fluorocarbon surfactant and silicone oil, wherein the mass ratio of the silicon micropowder, the titanium dioxide micropowder, the glass fiber powder, the chloropropene grinding powder, the fluorocarbon surfactant and the silicone oil is 5:1:1:1: 1.
Comparative example 6
The preparation method of the precoated sand in the comparative example is as follows:
(1) 100kg of inner covering roasting sand is taken and heated to 150 ℃, and then is put into a precoated sand mixer.
(2) 2kg of phenolic resin is added and stirred for 20 s.
(3) 3kg of a refractory is added, and the components of the refractory comprise: the silicon dioxide/silicone oil composite material comprises silicon micro powder, titanium dioxide micro powder, glass fiber powder, chloropropene grinding powder, a fluorocarbon surfactant and silicone oil, wherein the mass ratio of the silicon micro powder to the titanium dioxide micro powder to the glass fiber powder to the chloropropene grinding powder to the fluorocarbon surfactant to the silicone oil is 5:1:1:1: 1.
(4) Adding 0.2kg of urotropine aqueous solution and stirring for 38 s.
(5) 0.08kg of calcium stearate was added thereto, stirred for 35 seconds, discharged and cooled.
(6) Obtaining the finished product of common precoated sand, and packaging and warehousing the finished product of common precoated sand.
Test example 1
The performance evaluation was performed on the coated sands prepared in examples 1 to 3 and comparative examples 1 to 6, respectively, and the results are shown in table 1.
The tensile strength and the flowability of the test are both referred to standard JB/T8583-2008.
High temperature resistance time: and (3) preserving the heat of the precoated sand for 120s in a 230 ℃ mold to prepare a cylindrical test block with the diameter of 20mm and the height of 40 mm. And (3) carrying out vertical constant-temperature and constant-pressure loading on the test block, wherein the temperature of the constant-temperature and constant-pressure loading is 1000 ℃, the pressure is 0.2MPa, and the time required by crushing is recorded.
High temperature resistance: and (3) preserving the heat of the precoated sand for 120s in a 230 ℃ mold to prepare a cylindrical test block with the diameter of 20mm and the height of 40 mm. And (3) carrying out vertical constant-temperature variable-pressure loading on the test block, wherein the temperature of the constant-temperature constant-pressure loading is 1000 ℃, the pressure is increased at the rate of 0.01MPa/min from 0MPa, and the pressure reached by crushing is recorded.
TABLE 1
As can be seen from the data in Table 1, the precoated sand prepared by the method of the present invention has greatly improved high temperature resistance performance as compared with the comparative example 1 and 6, wherein the high temperature resistance strength is increased from 0.38MPa to 0.82MPa, the high temperature resistance time is increased from 166 to 258s, and both the strength and the fluidity are improved; as can be seen from the data of examples 1 to 3 and comparative examples 1 to 5, the reclaimed sand obtained by mixing the alkali phenolic resin used sand and the water glass used sand is better in high-temperature resistance as an aggregate than the reclaimed sand obtained by using single used sand. Secondly, the raw materials after ultrasonic activation treatment are used for preparing a refractory agent, so that the refractory agent has an obvious effect on improving the high-temperature resistance. Thirdly, the reclaimed sand is centrifugally selected, so that the influence of impurities on the performance of the precoated sand can be avoided, and the high-temperature resistance, the strength and the fluidity are improved. And fourthly, under the same condition, the high temperature resistance effect of the reclaimed sand is far better than that of the inner covering roasted sand by using the reclaimed sand as the aggregate. Using the refractory agent as additive under the same condition, the high temperature resistance effect is far better than that of common additive.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for preparing precoated sand for cast steel from recycled materials is characterized by comprising the following steps:
(1) regenerating the waste steel casting sand by adopting a hot method and a wet method, collecting waste water generated in the regeneration process, and performing flocculation precipitation on the waste water to obtain regenerated sand, waste water and sludge;
(2) mixing the wastewater and the sludge, and performing ultrasonic activation treatment to obtain mixed slurry with the viscosity of 200-500 mPa & s;
(3) granulating and roasting the mixed slurry, the magnesium oxide and the zircon powder to obtain a refractory agent;
(4) and (2) centrifugally selecting the reclaimed sand obtained in the step (1) to remove impurities, sequentially adding the refractory, phenolic resin, urotropine aqueous solution and calcium stearate, and cooling to obtain the coated sand for cast steel.
2. The method for preparing precoated sand for cast steel from recycled materials as claimed in claim 1, wherein in step (1), the steel casting waste sand is prepared by mixing 60-80 parts of alkali phenolic resin used sand and 20-40 parts of water glass used sand, and the hot method temperature is 300-800 ℃, and the wet scrubbing is carried out for 10-60 min.
3. The method of claim 1, wherein the wastewater of step (2) is 5 to 10 parts by weight, and the sludge is 5 to 10 parts by weight.
4. The method for preparing precoated sand for cast steel from reclaimed materials according to claim 1 or 3, wherein the ultrasonic frequency in step (2) is 20 to 60KHz, and the activation time is 10 to 30 min.
5. The method for preparing precoated sand for cast steel from reclaimed materials according to claim 1 or 3, wherein in step (2), the viscosity of the mixed slurry is measured, and if the viscosity is less than 200 mPas, 1 part of the sludge is continuously added for an extended activation time of 8 to 12min, and if the viscosity is greater than 500 mPas, 1 part of the wastewater is continuously added for an extended activation time of 8 to 12min, until a mixed slurry having a viscosity of 200 mPas to 500 mPas is obtained.
6. The method of claim 1, wherein the slurry in step (3) is mixed in an amount of 5 to 10 parts by weight, magnesium oxide in an amount of 1 to 2 parts by weight, and zircon powder in an amount of 3 to 5 parts by weight.
7. The method for preparing precoated sand for cast steel from recycled materials as claimed in claim 1, wherein the particle size after granulation in step (3) is 200-270 mesh, the roasting temperature is 800-1000 ℃, and the roasting time is 2-6 h.
8. The method for preparing precoated sand for cast steel from recycled materials according to claim 1, wherein the centrifugation speed in step (4) is 3600-.
9. The method of claim 1, wherein the reclaimed sand selected in the step (4) is 100 parts by weight of reclaimed sand, 2 to 5 parts by weight of a refractory, 1 to 3 parts by weight of a phenolic resin, 0.1 to 0.5 part by weight of an aqueous solution of urotropin, and 0.05 to 0.1 part by weight of calcium stearate.
10. The method of claim 1, wherein the reclaimed sand selected in step (4) is added with a refractory, a phenolic resin, an aqueous solution of urotropine, and calcium stearate and is stirred for 5-15s, the phenolic resin is added and is stirred for 10-30s, the aqueous solution of urotropine is added and is stirred for 30-45s, and the calcium stearate is added and is stirred for 30-40 s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN115026239A (en) * | 2022-06-16 | 2022-09-09 | 南阳仁创砂业科技有限公司 | Foundry reclaimed sand for preventing sand burning and air hole defects of castings and preparation method thereof |
| CN115106479A (en) * | 2022-06-27 | 2022-09-27 | 北京仁创砂业铸造材料有限公司 | Regeneration method of water glass casting waste sand and obtained regenerated sand |
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| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
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| CN115026239A (en) * | 2022-06-16 | 2022-09-09 | 南阳仁创砂业科技有限公司 | Foundry reclaimed sand for preventing sand burning and air hole defects of castings and preparation method thereof |
| CN115026239B (en) * | 2022-06-16 | 2023-11-28 | 南阳仁创砂业科技有限公司 | Casting reclaimed sand for preventing sand sticking and air hole defects of castings and preparation method thereof |
| CN115106479A (en) * | 2022-06-27 | 2022-09-27 | 北京仁创砂业铸造材料有限公司 | Regeneration method of water glass casting waste sand and obtained regenerated sand |
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