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Environment-friendly heat-resistant precoated sand as well as preparation method and application thereof

A coated sand, environmentally friendly technology, applied in foundry molding equipment, molds, cores, etc., can solve problems such as iron tailings coated sand that has not been reported yet, achieve delaying thermal decomposition, and have obvious cost advantages. , the effect of improving heat resistance

Pending Publication Date: 2022-04-15
通辽市仁创铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there have been no relevant reports on the use of iron tailings in the preparation of coated sand

Method used

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  • Environment-friendly heat-resistant precoated sand as well as preparation method and application thereof
  • Environment-friendly heat-resistant precoated sand as well as preparation method and application thereof
  • Environment-friendly heat-resistant precoated sand as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The embodiment of the present invention provides an environment-friendly heat-resistant coated sand.

[0051] 1. Composition

[0052]

[0053] 2. Preparation method

[0054] Specifically include the following steps:

[0055] S1. Weigh the silica sand and place it in the sand mixing bucket, and heat it to 150°C;

[0056] S2. Weigh the phenolic resin, add it into the sand mixing tank with heated silica sand in step S1, and stir for 25 seconds;

[0057] S3. Accurately weigh urotropine, add it to 3 times the mass of water and mix to obtain the urotropine aqueous solution, then add the urotropine aqueous solution into the sand mixing bucket in S2, and stir for 35s;

[0058]S4. Accurately weigh the pretreated iron tailings, add to the sand mixing bucket in S3, and stir for 12s;

[0059] S5. Accurately weigh the calcium stearate, add it into the sand mixing bucket in S4, and stir for 50 seconds.

Embodiment 2

[0061] The embodiment of the present invention provides an environment-friendly heat-resistant coated sand.

[0062] 1. Composition

[0063]

[0064] 2. Preparation method

[0065] Specifically include the following steps:

[0066] S1. Weigh the silica sand and place it in the sand mixing bucket, and heat it to 150°C;

[0067] S2. Weigh the phenolic resin, add it into the sand mixing tank with heated silica sand in step S1, and stir for 25 seconds;

[0068] S3. Accurately weigh urotropine, add it to 3 times the mass of water and mix to obtain the urotropine aqueous solution, then add the urotropine aqueous solution into the sand mixing bucket in S2, and stir for 35s;

[0069] S4. Accurately weigh the pretreated iron tailings, add to the sand mixing bucket in S3, and stir for 12s;

[0070] S5. Accurately weigh the calcium stearate, add it into the sand mixing bucket in S4, and stir for 50 seconds.

Embodiment 3

[0072] The embodiment of the present invention provides an environment-friendly heat-resistant coated sand.

[0073] 1. Composition

[0074]

[0075] 2. Preparation method

[0076] Specifically include the following steps:

[0077] S1. Weigh the silica sand and place it in the sand mixing bucket, and heat it to 150°C;

[0078] S2. Weigh the phenolic resin, add it into the sand mixing tank with heated silica sand in step S1, and stir for 25 seconds;

[0079] S3. Accurately weigh urotropine, add it to 3 times the mass of water and mix to obtain the urotropine aqueous solution, then add the urotropine aqueous solution into the sand mixing bucket in S2, and stir for 35s;

[0080] S4. Accurately weigh the pretreated iron tailings, add to the sand mixing bucket in S3, and stir for 12s;

[0081] S5. Accurately weigh the calcium stearate, add it into the sand mixing bucket in S4, and stir for 50 seconds.

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Abstract

The invention discloses environment-friendly heat-resistant precoated sand and a preparation method and application thereof.The environment-friendly heat-resistant precoated sand comprises silica sand, phenolic resin, a curing agent, a lubricating agent and iron tailings, the adding amount mass ratio of the silica sand to the phenolic resin is 96-98: 1-3, and the adding amount of the iron tailings accounts for 0.1-1.2 wt% of the silica sand; the preparation method comprises the following steps: uniformly mixing the silica sand of which the surface is sequentially coated with the phenolic resin layer and the curing agent layer with the iron tailing powder of which the particle size is less than 500 meshes, and then uniformly mixing with the lubricant. The iron tailing auxiliary agent is adopted to treat the precoated sand and can replace a fireproof coating and an iron oxide auxiliary agent so as to improve the heat resistance of the precoated sand, the cost advantage is obvious, the processes of coating and drying of a sand core are omitted, the cost is reduced, and the efficiency is improved; according to the environment-friendly heat-resistant precoated sand, the surfaces of the precoated sand grains are evenly coated with the iron tailings, and the conventional performance of the precoated sand is not affected.

Description

technical field [0001] The invention belongs to the technical field of coated sand preparation, and more specifically relates to an environment-friendly heat-resistant coated sand, a preparation method and an application. Background technique [0002] A large amount of iron tailings are produced in the process of iron ore production, which leads to a waste of iron resources and a series of environmental protection problems. According to statistics, the amount of tailings currently stockpiled in my country is nearly 5 billion tons, and the annual discharge of tailings is as high as 500 million tons. Through the analysis and study of the advantages and disadvantages of the utilization methods of iron tailings resources, it is expected to improve the comprehensive utilization rate of iron resources in the future. Protect the environment and promote economic development. [0003] With the continuous mining and utilization of iron ore resources, iron tailings, an inevitable produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/22
CPCY02W30/91
Inventor 尹海军孙贤洋冯俊龙李序华李泉超
Owner 通辽市仁创铸造材料有限公司
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