Release agent applied to casting mold of pig casting machine and preparation method of release agent

Abstract

The invention provides a release agent applied to a casting mold of a pig casting machine and a preparation method of the release agent, and belongs to the technical field of metallurgical casting paint coatings. The release agent comprises 4-20 parts of waste alumina-carbon brick micro powder, 4-15 parts of waste magnesia brick micro powder, 5-15 parts of waste resin sand micro powder, 40-120 parts of fly ash, 8-20 parts of graphite powder, 20-40 parts of pulverized coal, 30-50 parts of coal slime powder, 8-30 parts of silicon carbide powder, 10-24 parts of barite powder, 6-18 parts of mica powder, 0-4 parts of quick lime, 2-6 parts of potassium feldspar micro powder, 20-40 parts of kyanite micro powder and 20-45 parts of asphalt powder. 10 to 20 parts of petroleum coke micro powder; 20 to 30 parts of yellow dextrin and the like. The prepared mold protecting agent coating is high in strength, strong in adhesive force, low in price, low in pollution and non-toxic, and the service life of a casting mold can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical casting coating, and particularly relates to a demolding agent applied to a casting mold of a casting machine and a preparation method thereof. BACKGROUND

[0002] The casting machine is a device for blast furnace ironmaking, which can change liquid iron into iron blocks of certain shapes through casting. The casting machine has a shape like a circulating chain, on which casting molds and chain plates are arranged in sequence, and the inner cavity of the casting mold is sprayed with a demolding agent. In the casting process, the liquid iron flows into the inner cavity of the casting mold through the iron flow channel. When the casting mold moves to the driving sprocket position along the chain, the casting mold starts to overturn downward, and the iron block in the mold falls downward under the action of gravity. The demolding casting mold continues to move forward, and the inner surface of the casting mold is resprayed with the demolding agent when the casting mold reaches the spraying position. The sprayed demolding agent is quickly dried and solidified under the action of the residual heat of the casting mold. When the casting mold moves to the driven sprocket position along the lower chain, the casting mold overturns upward and is refilled with alloy liquid iron at the place of the iron flow channel nozzle, and the process is repeated.

[0003] In the production process, it is found that the erosion degree of the casting mold is quite different for different components of the liquid iron, especially for the production of ferrosilicon-manganese, ferrosilicon and high-sulfur iron products, the erosion of the casting mold is serious, the casting mold needs to be replaced frequently, and more manpower and material resources need to be invested. This situation leads to an increase in production cost and a decrease in production efficiency. Therefore, it is particularly important to improve the service life of the casting mold.

[0004] There are two ways to improve the service life of the casting mold, one is to improve the material quality of the casting mold to improve the ability of the casting mold to resist the erosion of the liquid iron, and the other is to improve the anti-erosion ability of the coating in the inner cavity of the casting mold. The former will greatly increase the procurement cost of the casting mold, and the cost of completely replacing the casting mold is as high as several million yuan. In the current environment, the demand for the steel industry is low, and users are also difficult to accept the high use cost. The latter is relatively low in price, and almost does not increase the comprehensive cost of producing iron blocks if a reasonable material is used.

[0005] At present, the demolding material is sprayed in the casting mold for the production of ferrous iron blocks. Due to the overcapacity of the domestic steel industry, the price of the demolding agent is low, and some demolding agents are prepared by using the production materials of the steel plant. This type of demolding agent can meet the requirements for the production of ordinary pig iron blocks, but the coating of the demolding agent is easily eroded by the liquid iron when producing products with complex liquid iron properties, the liquid iron damages the inner cavity of the casting mold, and the service life of the casting mold is greatly reduced. Therefore, the development of coating materials with superior performance is helpful to the long-term development of the ferrous alloy industry, and is also the inevitable development of the field of metallurgical casting coating. SUMMARY

[0006] The present application aims to provide a release agent for casting mold of a casting machine and a preparation method thereof to solve the problems in the background art.

[0007] To achieve the above object, the present application provides the following technical scheme:

[0008] A release agent for casting mold of a casting machine, comprising the following components in parts by weight: waste aluminum carbon brick micro powder 4-20 parts, waste magnesium brick micro powder 4-15 parts, waste resin sand micro powder 5-15 parts, dust removal ash 40-120 parts, graphite powder 8-20 parts, coal powder 20-40 parts, coal slurry powder 30-50 parts, silicon carbide powder 8-30 parts, barite powder 10-24 parts, mica powder 6-18 parts, quicklime 0-4 parts, potassium feldspar micro powder 2-6 parts, kyanite micro powder 20-40 parts, asphalt powder 20-45 parts, petroleum coke micro powder 10-20 parts, yellow dextrin 20-30 parts, suspending agent 2-20 parts, industrial waste oil 5 parts, sodium alkyl benzene sulfonate 0.5 parts, sodium fatty alcohol ether sulfate 1 part, sodium nitrite 0.2 parts, and water 180-350 parts.

[0009] Preferably, the waste aluminum carbon brick micro powder is made by crushing and grinding waste aluminum carbon brick or waste aluminum carbon ramming material, and the particle size is 150 mesh.

[0010] Preferably, the waste magnesium brick micro powder is made by crushing and grinding one or more of waste magnesium brick, waste magnesium carbon brick or waste magnesium aluminum carbon brick, and the particle size is 150 mesh.

[0011] Preferably, the waste resin sand micro powder is made by grinding waste resin sand, and the particle size is 150 mesh.

[0012] Preferably, the suspending agent comprises bentonite, diatomite and water, and the weight ratio of bentonite: diatomite: water is 1:1:8.

[0013] The present application also provides a preparation method of the release agent, which adopts the release agent for casting mold of a casting machine and comprises the following steps:

[0014] Step S1:

[0015] Preparation of suspending agent: mix and stir the bentonite, diatomite and water in a certain weight ratio to prepare the suspending agent, and stand for more than 24 hours for standby;

[0016] Preparation of emulsion A: mix and stir the industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water in a certain ratio to prepare the emulsion A;

[0017] Preparation of aggregate B: the waste aluminum carbon brick micro powder, waste magnesium brick micro powder, waste resin sand micro powder, silicon carbide powder, barite powder, mica powder, quicklime, potassium feldspar micro powder, kyanite micro powder are poured into a blender in proportion by weight and stirred uniformly to obtain aggregate B;

[0018] Step S2:

[0019] The dust removal ash, graphite powder, coal powder, coal slime powder, asphalt powder, petroleum coke micro powder and yellow dextrin are poured into a spiral blender in proportion and stirred uniformly, and then part or all of the emulsion A is added and continuously stirred until the material in the spiral blender becomes loose and lumpy to obtain the mixed material C;

[0020] Step S3:

[0021] The aggregate B and the mixed material C are added into the spiral blender, and a certain amount of water is added and stirred to obtain the loose lumpy material, which is the mixed material D;

[0022] Step S4:

[0023] The suspending agent, sodium nitrite, water and the remaining emulsion A are put into a blender and stirred uniformly at a low speed, and then the mixed material D and the remaining water are added and stirred uniformly at a medium speed to obtain the release agent.

[0024] Preferably, in step S1, the mass ratio of the industrial waste oil, sodium alkylbenzene sulfonate, fatty alcohol ether sodium sulfate and water for preparing the emulsion A is 10:1:2:50.

[0025] Preferably, in step S4, the low-speed stirring speed is 30-50 rpm, and the stirring time is 20-60 min; the medium-speed stirring speed is 120-240 rpm, and the stirring time is 40-80 min.

[0026] The beneficial effects of the above technical solutions of the present application are as follows:

[0027] 1. The kyanite is added in the present application, and the kyanite has a slightly larger expansion coefficient under high temperature conditions above 1000 DEG C. According to the characteristics that the aggregate in the release agent coating is easy to shrink under high temperature sintering, the present application finds that the dust removal ash, coal slime powder, bentonite and diatomite in the release agent coating have a large sintering shrinkage ratio under high temperature conditions above 1200 DEG C. According to this research, the high-temperature expansion material is matched to prepare the release agent coating material, which can slow down the shrinkage and cracking of the powder under high temperature conditions. The expanded kyanite particles can fill the coating gap, making the coating more dense and promoting the realization of physical isolation.

[0028] 2, The old aluminum carbon brick micro powder, waste old magnesium brick micro powder, waste old resin sand micro powder are added in the application, the materials have experienced high temperature sintering or high temperature use, the secondary shrinkage of volume under high temperature is small, the volume effect is stable, the shrinkage cracks of the coating layer generated under high temperature can be relieved, the coating layer is more dense, and physical isolation is promoted to be realized;

[0029] 3, The potassium feldspar micro powder is added in the application and is fused under high temperature, can effectively fill the gap between the coating particles, promote the sintering of the mold protection agent, and dense the coating layer;

[0030] 4, The asphalt powder and petroleum coke micro powder are added in the application, and after being heated, high carbon residue molecular chain structure can be formed in the coating layer, the strength of the coating layer is improved, and the ability of the coating layer to resist molten iron erosion is improved;

[0031] 5, The graphite powder and coal powder are added in the application, the surface of the coating layer can be lubricated, the surface of the mold protection agent can be sprayed with a mold release agent material, the interface between the mold protection agent coating layer and the mold release agent coating layer is clear, and the mold protection agent coating layer and the mold release agent coating layer are not sintered together, so that the demolding ability of the casting block is improved.

[0032] 6, The barite micro powder is added in the application, the density of the barite is large, the density of the coating layer can be improved, the strength of the mold protection agent coating layer is improved, the ability of the coating layer to resist molten iron erosion is improved, and the service life of the casting mold is improved;

[0033] 7, The mica powder is added in the application, the flaky structure of the mica powder can increase the contact area of the powder and the casting mold, improve the adhesion of the mold protection agent coating layer, and improve the resistance of the mold protection agent coating layer to molten iron erosion.

[0034] 8, The sodium alkyl benzene sulfonate and the sodium fatty alcohol ether sulfate are added in the application, the surface of the micro powder can be better wetted, and the components of the coating are more evenly distributed.

[0035] 9, The industrial waste oil is added in the application and is wrapped on the surface of the graphite powder, the oxidation speed of the graphite can be slowed down during casting, the oil can generate carbide in situ after pyrolysis, and the demolding of the casting block is promoted.

[0036] 10, The application has a wide source of materials, utilizes dust removal ash, coal slime powder and waste refractory brick grinding powder, is beneficial to the sustainable development of the industry, adds silicon carbide micro powder and other high-temperature aggregates, and cooperates with asphalt powder, yellow dextrin binder, suspending agent, sintering aid, expansion aid and the like, and under the wetting action of sodium alkyl benzene sulfonate and sodium fatty alcohol ether sulfate, the mold protection agent coating prepared by the application has the advantages of high strength, strong adhesion, low price, low pollution, non-toxicity, and can effectively improve the service life of the casting mold. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above and other objects, features and advantages of the present application will become readily apparent from the detailed description which follows, read in conjunction with the accompanying drawings. In the drawings, which represent embodiments of the application in an example but not limiting manner, and wherein like or corresponding elements are denoted by like reference numerals, there is shown:

[0038] Figure 1 Flow chart of the preparation method of the present application;

[0039] Figure 2 Comparison chart of the test results of the examples and comparative examples of the present application. DETAILED DESCRIPTION

[0040] The following examples are provided to better enable those skilled in the art to make and use the application, and are not intended to limit the scope of the application or the content of the disclosure. Any product that is the same as or similar to the present application derived from the disclosure of the present application or from the combination of the present application with other prior art features falls within the scope of the present application.

[0041] If the specific experimental steps or conditions are not specified in the examples, the operation or conditions can be carried out according to the conventional experimental steps described in the literature in the art. If the reagents or instruments used are not specified by the manufacturer, they are conventional reagent products that can be obtained commercially.

[0042] Example 1

[0043] A release agent applied to a cast iron machine casting mold, comprising the following components in parts by weight: waste aluminum carbon brick micro powder 4 parts, waste magnesite brick micro powder 15 parts, waste resin sand micro powder 5 parts, dust removal ash 120 parts, graphite powder 8 parts, coal powder 20 parts, coal slurry powder 30 parts, silicon carbide powder 30 parts, barite powder 20 parts, mica powder 18 parts, potassium feldspar micro powder 2 parts, kyanite micro powder 25 parts, pitch powder 45 parts, petroleum coke micro powder 20 parts, yellow dextrin 30 parts, suspending agent 2 parts, industrial waste oil 5 parts, sodium alkyl benzene sulfonate 0.5 parts, sodium fatty alcohol ether sulfate 1 part, sodium nitrite 0.2 parts, and water 350 parts.

[0044] The suspending agent comprises bentonite, diatomite and water, and the weight ratio of bentonite: diatomite: water is 1:1:8.

[0045] The preparation of the above release agent is shown in Figure 1 and specifically comprises the following steps:

[0046] Step S1:

[0047] Preparation of the suspending agent: mix and stir the bentonite, diatomite and water in a weight ratio of 1:1:8 to obtain 2 parts of the suspending agent, which needs to be placed for 24 h before use;

[0048] Preparation of emulsion A: Industrial waste oil, sodium alkylbenzene sulfonate, sodium fatty alcohol ether sulfate and water were mixed in a weight ratio of 10:1:2:50 and stirred evenly to prepare 31.5 parts of emulsion A;

[0049] Preparation of aggregate B: 4 parts of waste aluminum-carbon brick powder, 15 parts of waste magnesium brick powder, 5 parts of waste resin sand powder, 30 parts of silicon carbide powder, 20 parts of barite powder, 18 parts of mica powder, 2 parts of potassium feldspar powder and 25 parts of kyanite powder are poured into a mixer in the weight ratio and stirred for 5 minutes until uniform to obtain aggregate B.

[0050] Step S2:

[0051] 120 parts of dust, 8 parts of graphite powder, 20 parts of coal powder, 30 parts of coal slime powder, 45 parts of asphalt powder, 20 parts of petroleum coke powder and 30 parts of yellow dextrin are added into a spiral mixer in proportion and stirred evenly. Then 25 parts of emulsion A are added and stirring is continued until the material in the spiral mixer becomes a loose clump, thus obtaining compound C.

[0052] Step S3:

[0053] Add all of the above-prepared aggregate B and all of the above-prepared compound C to a spiral mixer and stir. Add 35 parts of water and stir for 40 minutes. The resulting loose clumps are the compound D.

[0054] Step S4:

[0055] Place 2 parts of suspending agent, 0.2 parts of sodium nitrite, 100 parts of water and the remaining emulsion A into a mixer and stir at 50 rpm for 20 minutes until uniform. Then add all of the above-prepared mixture D and the remaining water and stir at 150 rpm for 80 minutes until uniform to obtain the release agent.

[0056] Example 2

[0057] A release agent for use in casting molds of cast iron machines comprises, by weight, the following components: 10 parts of used alumina-carbon brick powder, 6 parts of waste magnesia brick powder, 15 parts of waste resin sand powder, 40 parts of dust collector ash, 20 parts of graphite powder, 40 parts of coal powder, 50 parts of coal slime powder, 8 parts of silicon carbide powder, 20 parts of barite powder, 12 parts of mica powder, 2 parts of quicklime, 6 parts of potassium feldspar powder, 30 parts of kyanite powder, 35 parts of asphalt powder, 10 parts of petroleum coke powder, 20 parts of yellow dextrin, 10 parts of suspending agent, 5 parts of industrial waste oil, 0.5 parts of sodium alkylbenzene sulfonate, 1 part of sodium fatty alcohol ether sulfate, 0.2 parts of sodium nitrite, and 180 parts of water.

[0058] The preparation of the above-mentioned release agent includes the following steps:

[0059] Step S1:

[0060] Preparation of the suspension agent: bentonite, diatomite and water are mixed in a weight ratio of 1:1:8 and stirred uniformly to prepare 10 parts of the suspension agent, which needs to be placed for 24 h before use;

[0061] Preparation of the emulsion A: industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water are mixed in a weight ratio of 10:1:2:50 and stirred uniformly to prepare 31.5 parts of the emulsion A;

[0062] Preparation of the aggregate B: waste aluminum carbon brick powder 10 parts, waste magnesium brick powder 6 parts, waste resin sand powder 15 parts, silicon carbide powder 8 parts, barite powder 20 parts, mica powder 12 parts, quicklime 2 parts, potassium feldspar powder 6 parts and kyanite powder 30 parts are poured into a stirrer in a weight ratio and stirred for 5 min until uniform to obtain the aggregate B;

[0063] Step S2:

[0064] The dust removal ash 40 parts, graphite powder 20 parts, coal powder 40 parts, coal slime powder 50 parts, pitch powder 35 parts, petroleum coke powder 10 parts and yellow dextrin 20 parts are poured into a spiral stirrer in proportion and stirred uniformly, then all 31.5 parts of the emulsion A are added and continue to stir until the material in the spiral stirrer becomes loose and lumpy to obtain the mixing material C;

[0065] Step S3:

[0066] All the aggregate B prepared above and all the mixing material C prepared above are added into a spiral stirrer and stirred, 35 parts of water are added and stirred for 55 min to obtain a loose lumpy material, which is the mixing material D;

[0067] Step S4:

[0068] The suspension agent 10 parts, sodium nitrite 0.2 parts and water 100 parts are put into a stirrer and stirred at 30 rpm for 60 min until uniform, then all the mixing material D prepared above and the remaining water are added and stirred at 240 rpm for 40 min until uniform to obtain the release agent.

[0069] Example 3

[0070] A release agent applied to a casting mold of a casting machine, comprising the following components in weight parts: waste aluminum carbon brick powder 15 parts, waste magnesium brick powder 9 parts, waste resin sand powder 11 parts, dust removal ash 65 parts, graphite powder 13 parts, coal powder 32 parts, coal slime powder 38 parts, silicon carbide powder 22 parts, barite powder 17 parts, mica powder 11 parts, quicklime 4 parts, potassium feldspar powder 3 parts, kyanite powder 28 parts, pitch powder 20 parts, petroleum coke powder 12 parts, yellow dextrin 24 parts, suspension agent 20 parts, industrial waste oil 5 parts, sodium alkyl benzene sulfonate 0.5 parts, sodium fatty alcohol ether sulfate 1 part, sodium nitrite 0.2 parts, and water 240 parts.

[0071] The preparation of the demoulding agent comprises the following steps:

[0072] Step S1:

[0073] Preparation of the suspending agent: bentonite, diatomite and water are mixed in a weight ratio of 1:1:8 and stirred uniformly to prepare 20 parts of the suspending agent, which needs to be placed for 24 h before use;

[0074] Preparation of the emulsion A: industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water are mixed in a weight ratio of 10:1:2:50 and stirred uniformly to prepare 31.5 parts of the emulsion A;

[0075] Preparation of the aggregate B: waste aluminum carbon brick powder 15 parts, waste magnesite brick powder 9 parts, waste resin sand powder 11 parts, silicon carbide powder 22 parts, barite powder 17 parts, mica powder 11 parts, quicklime 4 parts, potassium feldspar powder 3 parts and kyanite powder 28 parts are poured into a stirrer in a weight ratio and stirred for 5 min until uniform to obtain the aggregate B;

[0076] Step S2:

[0077] The dust removal ash 65 parts, graphite powder 13 parts, coal powder 32 parts, coal slime powder 38 parts, asphalt powder 20 parts, petroleum coke powder 12 parts and yellow dextrin 24 parts are poured into a spiral stirrer in a proportion and stirred uniformly, then 28 parts of the above prepared emulsion A is added and stirred until the material in the spiral stirrer becomes loose and lump-shaped to obtain the mixing material C;

[0078] Step S3:

[0079] The above prepared aggregate B and the above prepared mixing material C are added into a spiral stirrer and stirred, 30 parts of water is added and stirred for 50 min to obtain a loose lump-shaped material, which is the mixing material D;

[0080] Step S4:

[0081] The suspending agent 20 parts, sodium nitrite 0.2 parts, water 100 parts and the remaining emulsion A are put into a stirrer and stirred at 40 rpm for 45 min until uniform, then the above prepared mixing material D and the remaining water are added and stirred at 190 rpm for 55 min until uniform to obtain the demoulding agent.

[0082] Example 4

[0083] A kind of release agent applied to cast iron machine casting mold, by weight parts, including the following components: old aluminum carbon brick micro powder 16 parts, waste magnesium brick micro powder 9 parts, waste resin sand micro powder 11 parts, dust 85 parts, graphite powder 17 parts, coal powder 33 parts, coal slime powder 43 parts, silicon carbide powder 17 parts, barite powder 13 parts, mica powder 14 parts, quicklime 3 parts, potassium feldspar micro powder 5 parts, kyanite micro powder 36 parts, pitch powder 38 parts, petroleum coke micro powder 19 parts, yellow dextrin 27 parts, suspending agent 17 parts, industrial waste oil 5 parts, sodium alkyl benzene sulfonate 0.5 parts, sodium fatty alcohol ether sulfate 1 part, sodium nitrite 0.2 parts, water 300 parts.

[0084] The preparation of the above release agent includes the following steps:

[0085] Step S1:

[0086] Preparation of suspending agent: bentonite, diatomite and water are mixed and stirred uniformly according to the weight ratio of 1:1:8, and 17 parts of suspending agent are prepared, which needs to be placed for 24 h before use;

[0087] Preparation of emulsion A: industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water are mixed and stirred uniformly according to the weight ratio of 10:1:2:50, and 31.5 parts of emulsion A are prepared;

[0088] Preparation of aggregate B: waste old aluminum carbon brick micro powder 16 parts, waste old magnesium brick micro powder 9 parts, waste old resin sand micro powder 11 parts, silicon carbide powder 17 parts, barite powder 13 parts, mica powder 14 parts, quicklime 3 parts, potassium feldspar micro powder 5 parts and kyanite micro powder 36 parts are poured into a stirrer according to the weight ratio, stirred for 5 min until uniform, and aggregate B is obtained;

[0089] Step S2:

[0090] Dust 85 parts, graphite powder 17 parts, coal powder 33 parts, coal slime powder 43 parts, pitch powder 38 parts, petroleum coke micro powder 19 parts and yellow dextrin 27 parts are poured into a spiral stirrer according to the weight ratio and stirred uniformly, then 30 parts of emulsion A prepared in step S1 is added, and stirring is continued until the material in the spiral stirrer becomes loose and lumpy, and mixing material C is obtained;

[0091] Step S3:

[0092] All aggregate B prepared above and all mixing material C prepared above are added to a spiral stirrer, 45 parts of water is added, and stirring is carried out for 60 min, and the obtained loose lumpy material is mixing material D;

[0093] Step S4:

[0094] The suspension agent 17 parts, sodium nitrite 0.2 parts, water 100 parts and the remaining emulsion A were put into a blender, stirred at 48 rpm for 40 min to be uniform, then the whole mixing material D prepared in step S3 and the remaining water were added, stirred at 210 rpm for 45 min to be uniform, to obtain the release agent.

[0095] Comparative Example 1

[0096] The difference from Example 2 is that no kyanite powder is added in the components of the release agent.

[0097] Comparative Example 2

[0098] The difference from Example 2 is that no coal powder is added in the components of the release agent.

[0099] Comparative Example 3

[0100] The difference from Example 2 is that no graphite powder is added in the components of the release agent.

[0101] Comparative Example 4

[0102] The difference from Example 2 is that no barite powder is added in the components of the release agent.

[0103] Comparative Example 5

[0104] The difference from Example 2 is that no mica powder is added in the components of the release agent.

[0105] Comparative Example 6

[0106] The difference from Example 2 is that no potassium feldspar powder is added in the components of the release agent.

[0107] Comparative Example 7

[0108] The difference from Example 2 is that no pitch powder is added in the components of the release agent.

[0109] Comparative Example 8

[0110] The difference from Example 1 is that no industrial waste oil is added in the components of the release agent, and no industrial waste oil is contained in the emulsion A.

[0111] Comparative Example 9

[0112] The difference from Example 1 is that the suspension agent, emulsion A, aggregate B, fly ash, graphite powder, coal powder, coal slime powder, pitch powder, petroleum coke powder, yellow dextrin, sodium nitrite and water are simultaneously added into the blender for stirring when preparing the release agent, and the release agent is obtained after stirring uniformly.

[0113] Simulated impact casting test

[0114] The release agents prepared in the above Examples 1-4 and Comparative Examples 1-9 were tested by a simulated impact casting test, i.e. a simulated hot casting when a casting machine is working. The release agent coating was sprayed on the surface of a sampling container, and after the surface of the coating was solidified and cooled, the solidified coating was subjected to a simple strength test by a finger simple scratch method. In the simulated impact test, the temperature of the alloy molten iron was not less than 1400℃, and the bottom end of the molten iron runner was 30cm apart from the sampling container. In the simulated impact casting test, each sampling container was simulated for 3 times of impact sampling in succession. The sampling container was sprayed with a release agent coating each time when new alloy molten iron was filled, but in the second and third simulated impact sampling tests, the sampling container was used without cooling and the strength of the release agent coating was not tested.

[0115] The test results of the simulated impact casting test are shown in Table 1, and the comparison of the casting results is shown in Figure 2

[0116] Table 1 Coating, surface of the cast block and release condition

[0117] Example Coating spray strength Ease of demolding Coating residue condition Appearance of the cast block Example 1 High strength Easy to demold Coating complete with no buildup on the bottom Smooth appearance Example 2 High strength Easy to demold Coating complete with no buildup on the bottom Smooth appearance Example 3 High strength Easy to demold Coating complete with no buildup on the bottom Smooth appearance Example 4 High strength Easy to demold Coating complete with no buildup on the bottom Smooth appearance Comparative Example 1 High strength Easy to demold Coating relatively complete with a small amount of buildup on the bottom Relatively smooth appearance Comparative Example 2 High strength Difficult to demold Coating relatively complete with buildup on the bottom Not smooth appearance Comparative Example 3 High strength Difficult to demold Coating incomplete with buildup on the bottom Not smooth appearance Comparative Example 4 Ordinary strength Difficult to demold Coating incomplete with no buildup on the bottom Not smooth appearance Comparative Example 5 High strength Easy to demold Coating incomplete with a small amount of buildup on the bottom Not smooth appearance Comparative Example 6 High strength Easy to demold Coating relatively complete with no buildup on the bottom Not smooth appearance Comparative Example 7 Ordinary strength Difficult to demold Coating incomplete with buildup on the bottom Not smooth appearance Comparative Example 8 Ordinary strength Difficult to demold Coating incomplete with no buildup on the bottom Not smooth appearance Comparative Example 9 Ordinary strength Difficult to demold Coating largely missing with buildup on the bottom Not smooth appearance

[0118] As shown in Table 1 and Figure 2 , it is found by the simulated impact casting test that the test results of Examples 1-4 are better than those of Comparative Examples 1-9. After casting, the residual thin coating of Examples 1-4 is relatively complete, which can more easily cope with alloy molten iron with complex composition and strong corrosion ability, prolong the service life of the casting mold, and the inner cavity of the mold after casting is free of accumulated coating, which is suitable for continuous casting working conditions, and can reduce the subsequent maintenance cost of the casting machine.

[0119] Finally, it is to be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the present application, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not deviate from the spirit and scope of the technical solutions of the present application.​

Claims

1. A mold release agent for use in a casting mold of a casting machine, characterized by, By weight, including the following components: waste aluminum carbon brick micro powder 4-20 parts, waste magnesium brick micro powder 4-15 parts, waste resin sand micro powder 5-15 parts, dust 40-120 parts, graphite powder 8-20 parts, coal powder 20-40 parts, coal slime powder 30-50 parts, silicon carbide powder 8-30 parts, barite powder 10-24 parts, mica powder 6-18 parts, quicklime 0-4 parts, potassium feldspar micro powder 2-6 parts, kyanite micro powder 20-40 parts, pitch powder 20-45 parts, petroleum coke micro powder 10-20 parts, yellow dextrin 20-30 parts, suspending agent 2-20 parts, industrial waste oil 5 parts, sodium alkyl benzene sulfonate 0.5 parts, sodium fatty alcohol ether sulfate 1 part, sodium nitrite 0.2 parts, water 180-350 parts.

2. The parting agent for use in a casting mold of a casting machine according to claim 1, characterized in that, The waste aluminum carbon brick micro powder is made by crushing and grinding waste aluminum carbon brick or waste aluminum carbon ramming material, and the particle size is 150 mesh.

3. The parting agent for use in a casting mold of a casting machine according to claim 1, characterized in that, The waste magnesium brick micro powder is made by crushing and grinding one or more of waste magnesium brick, waste magnesium carbon brick or waste magnesium aluminum carbon brick, and the particle size is 150 mesh.

4. The parting agent for use in a casting mold of a casting machine according to claim 1, characterized in that, The waste resin sand micro powder is made by grinding waste resin sand, and the particle size is 150 mesh.

5. The parting agent for use in a casting mold of a casting machine according to claim 1, characterized in that, The suspending agent includes bentonite, diatomite and water, and the weight ratio of bentonite: diatomite: water is 1:1:

8.

6. A method for producing a release agent, using the release agent for a casting mold of a casting machine according to any one of claims 1 to 5, characterized by, The method comprises the following steps: Step S1: Preparation of suspending agent: mix and stir the bentonite, diatomite and water in a weight ratio to prepare the suspending agent, and stand for more than 24 hours for standby; Preparation of emulsion A: mix and stir the industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water in a certain ratio to prepare the emulsion A; Preparation of aggregate B: pour the waste aluminum carbon brick micro powder, waste magnesium brick micro powder, waste resin sand micro powder, silicon carbide powder, barite powder, mica powder, quicklime, potassium feldspar micro powder and kyanite micro powder into a stirrer in a weight ratio, and stir to obtain the aggregate B; Step S2: Pour the dust, graphite powder, coal powder, coal slime powder, pitch powder, petroleum coke micro powder and yellow dextrin into a spiral stirrer in a certain ratio, stir uniformly, add part or all of the emulsion A, continue to stir until the material in the spiral stirrer becomes loose and lumpy to obtain the mixing material C; Step S3: Add the aggregate B and the mixing material C into the spiral stirrer, add a certain amount of water, and stir to obtain the loose lumpy material, which is the mixing material D; Step S4: Put the suspending agent, sodium nitrite, water and the remaining emulsion A into the stirrer, stir uniformly at a low speed, then add the mixing material D and the remaining water, and stir uniformly at a medium speed to obtain the release agent.

7. The method of claim 6, wherein the release agent is prepared by the steps of: In step S1, the mass ratio of the industrial waste oil, sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and water in the preparation of the emulsion A is 10:1:2:

50.

8. The method of claim 6, wherein the release agent is prepared by the steps of: In step S4, the low-speed stirring speed is 30-50 rpm, and the stirring time is 20-60 min; the medium-speed stirring speed is 120-240 rpm, and the stirring time is 40-80 min.

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