CN112191796A - Preparation method of high-temperature-resistant casting molding sand - Google Patents
Preparation method of high-temperature-resistant casting molding sand Download PDFInfo
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- CN112191796A CN112191796A CN202011344004.3A CN202011344004A CN112191796A CN 112191796 A CN112191796 A CN 112191796A CN 202011344004 A CN202011344004 A CN 202011344004A CN 112191796 A CN112191796 A CN 112191796A
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- Prior art keywords
- sand
- montmorillonite
- temperature
- resistant
- heat
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Classifications
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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
-
- 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
- B22C1/18—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 inorganic agents
- B22C1/181—Cements, oxides or clays
Abstract
The invention discloses a preparation method of high-temperature-resistant foundry molding sand; relates to the technical field of foundry sand, comprising the following steps: (1) mixing quartz sand and zircon sand together, then carrying out dipping treatment for 30-40min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1-1.5 hours at the temperature of 420-450 ℃ to obtain pretreated mixed sand; (2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite; (3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite; (4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material; the foundry molding sand prepared by the method has excellent high temperature resistance, and the high temperature resistance of the foundry molding sand is remarkably improved compared with that of pure quartz sand by taking the quartz sand and the zircon sand as raw sand bases.
Description
Technical Field
The invention belongs to the technical field of casting molding sand, and particularly relates to a preparation method of high-temperature-resistant casting molding sand.
Background
The molding sand is generally prepared by mixing raw sand for casting, a binder and auxiliary materials according to a certain mass ratio.
Traditional molding sand preparation adopts single or several simple sand moulds to mix mostly and makes, however, its high temperature resistance can be relatively poor to lead to appearing various problems, especially in high temperature sand grain stability not enough, appear easily and be heated the inflation, thereby take place the displacement, and then by a wide margin reduced the smoothness on cast spare part surface, increased follow-up more processing procedure, increased the cost.
Disclosure of Invention
The invention aims to provide a preparation method of high-temperature-resistant foundry molding sand, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation method of high-temperature-resistant foundry molding sand comprises the following steps:
(1) mixing quartz sand and zircon sand together, then carrying out dipping treatment for 30-40min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1-1.5 hours at the temperature of 420-450 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 4-6: 1.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
As a further technical scheme: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
As a further technical scheme: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
As a further technical scheme: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
As a further technical scheme: the high-temperature heat treatment temperature is 550-568 ℃, and the heat preservation time is 43 min.
As a further technical scheme: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
As a further technical scheme: the starch is corn starch.
The hot alkali solution is potassium hydroxide solution with the mass fraction of 10% and the temperature of 80 ℃.
Has the advantages that:
the invention discloses a preparation method of high-temperature-resistant foundry molding sand, which has excellent high-temperature-resistant performance, quartz sand and zircon sand are used as raw sand bases, the high-temperature-resistant performance of the high-temperature-resistant foundry molding sand is obviously improved compared with that of pure quartz sand, meanwhile, the high-temperature-resistant performance of the mixed sand is further improved by mixing the quartz sand and the zircon sand, the binding performance of montmorillonite can be effectively improved by modifying the montmorillonite, the montmorillonite can be used as a binding agent, the binding performance can be effectively enhanced, and after high-temperature casting is carried out, an active agent can be burnt, so that the scattering strength is reduced, and the collapsibility is improved.
Detailed Description
A preparation method of high-temperature-resistant foundry molding sand comprises the following steps:
(1) mixing quartz sand and zircon sand together, then carrying out dipping treatment for 30-40min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1-1.5 hours at the temperature of 420-450 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 4-6: 1.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
As a further technical scheme: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
As a further technical scheme: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
As a further technical scheme: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
As a further technical scheme: the high-temperature heat treatment temperature is 550-568 ℃, and the heat preservation time is 43 min.
As a further technical scheme: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
As a further technical scheme: the starch is corn starch.
The hot alkali solution is potassium hydroxide solution with the mass fraction of 10% and the temperature of 80 ℃.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of high-temperature-resistant foundry molding sand comprises the following steps:
(1) mixing quartz sand and zircon sand together, then carrying out immersion treatment for 30min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1 hour at 420 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 4: 1.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
As a further technical scheme: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
As a further technical scheme: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
As a further technical scheme: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
As a further technical scheme: the high-temperature heat treatment temperature is 550 ℃, and the heat preservation time is 43 min.
As a further technical scheme: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
As a further technical scheme: the starch is corn starch.
The hot alkali solution is potassium hydroxide solution with the mass fraction of 10% and the temperature of 80 ℃.
Example 2
A preparation method of high-temperature-resistant foundry molding sand comprises the following steps:
(1) mixing quartz sand and zircon sand together, then carrying out immersion treatment for 40min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1.5 hours at 450 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 6: 1.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
As a further technical scheme: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
As a further technical scheme: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
As a further technical scheme: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
As a further technical scheme: the high-temperature heat treatment temperature is 568 ℃, and the heat preservation time is 43 min.
As a further technical scheme: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
As a further technical scheme: the starch is corn starch.
The hot alkali solution is potassium hydroxide solution with the mass fraction of 10% and the temperature of 80 ℃.
Example 3
A preparation method of high-temperature-resistant foundry molding sand comprises the following steps:
(1) mixing quartz sand and zircon sand together, then carrying out immersion treatment for 35min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1.2 hours at 428 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 4-6: 1.
As a further technical scheme: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
As a further technical scheme: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
As a further technical scheme: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
As a further technical scheme: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
As a further technical scheme: the high-temperature heat treatment temperature is 556 ℃, and the heat preservation time is 43 min.
As a further technical scheme: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
As a further technical scheme: the starch is corn starch.
The hot alkali solution is potassium hydroxide solution with the mass fraction of 10% and the temperature of 80 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (9)
1. The preparation method of the high-temperature-resistant foundry molding sand is characterized by comprising the following steps of:
(1) mixing quartz sand and zircon sand together, then carrying out dipping treatment for 30-40min by adopting hot alkali liquor, and then carrying out heat preservation treatment for 1-1.5 hours at the temperature of 420-450 ℃ to obtain pretreated mixed sand;
(2) modifying montmorillonite with an active agent solution to obtain modified montmorillonite;
(3) carrying out high-temperature heat treatment on the modified montmorillonite to obtain heat-treated montmorillonite;
(4) sequentially mixing the pretreated mixed sand, the heat-treated montmorillonite, the starch and the water together, and stirring at the rotating speed of 1200r/min for 30min to obtain the montmorillonite-water composite material.
2. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the mixing mass ratio of the quartz sand to the zircon sand is 4-6: 1.
3. The method of preparing foundry sand resistant to high temperatures according to claim 2, wherein: the mixing mass ratio of the quartz sand to the zircon sand is 5: 1.
4. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the active agent solution is: fatty alcohol-polyoxyethylene ether sodium sulfate solution.
5. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the mass fraction of the fatty alcohol-polyoxyethylene ether sodium sulfate solution is 3.2%.
6. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the mixing mass ratio of the modified montmorillonite to the activator solution is 1: 5.5.
7. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the high-temperature heat treatment temperature is 550-568 ℃, and the heat preservation time is 43 min.
8. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the mixing mass ratio of the pretreated mixed sand to the heat-treated montmorillonite to the starch to the water is 50:18:3: 8.
9. The method of preparing foundry sand resistant to high temperatures according to claim 1, wherein: the starch is corn starch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011344004.3A CN112191796A (en) | 2020-11-26 | 2020-11-26 | Preparation method of high-temperature-resistant casting molding sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011344004.3A CN112191796A (en) | 2020-11-26 | 2020-11-26 | Preparation method of high-temperature-resistant casting molding sand |
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| CN112191796A true CN112191796A (en) | 2021-01-08 |
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| CN202011344004.3A Withdrawn CN112191796A (en) | 2020-11-26 | 2020-11-26 | Preparation method of high-temperature-resistant casting molding sand |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140034B1 (en) * | 1969-10-31 | 1976-11-01 | ||
| CN101934348A (en) * | 2010-09-30 | 2011-01-05 | 黄九连 | Surface sand for precise casting and preparation thereof |
| CN102365140A (en) * | 2009-02-02 | 2012-02-29 | 哈利伯顿能源服务公司 | Modified bentonites for advanced foundry applications |
| CN104985106A (en) * | 2015-07-06 | 2015-10-21 | 安徽三联泵业股份有限公司 | Modified casting sand used for casting pump body and adopting furan resin loaded with nanometer montmorillonite |
| CN105903888A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | High-temperature-resistant easily-collapsing precoated sand |
| CN106077435A (en) * | 2016-08-18 | 2016-11-09 | 江阴联华铸造有限公司 | A kind of train wheel casting wet type clay core sand and preparation method thereof |
-
2020
- 2020-11-26 CN CN202011344004.3A patent/CN112191796A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140034B1 (en) * | 1969-10-31 | 1976-11-01 | ||
| CN102365140A (en) * | 2009-02-02 | 2012-02-29 | 哈利伯顿能源服务公司 | Modified bentonites for advanced foundry applications |
| CN101934348A (en) * | 2010-09-30 | 2011-01-05 | 黄九连 | Surface sand for precise casting and preparation thereof |
| CN104985106A (en) * | 2015-07-06 | 2015-10-21 | 安徽三联泵业股份有限公司 | Modified casting sand used for casting pump body and adopting furan resin loaded with nanometer montmorillonite |
| CN105903888A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | High-temperature-resistant easily-collapsing precoated sand |
| CN106077435A (en) * | 2016-08-18 | 2016-11-09 | 江阴联华铸造有限公司 | A kind of train wheel casting wet type clay core sand and preparation method thereof |
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Application publication date: 20210108 |