Cast glass sand and preparation method thereof

A technology of casting glass and borax, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of large consumption, deterioration of casting quality, black pollution of the environment, etc., to prevent molten iron from infiltrating molding sand, and to reuse more times , good sand removal performance

Active Publication Date: 2019-01-11
李新忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the advantages of low material cost, good anti-sticking sand effect and high production efficiency, but its consumption is large, the emission is serious, and coal powder is burned and decomposed during the casting process to produce toxic gases and carcinogens, which pollute the environment and affect the health of workers. healthy
According to statistics, the use of coal powder clay sand to produce castings requires about 0.8t to 1t of molding sand per ton of castings. A large amount of old sand is discarded every year in the country, and tens of millions of tons of new sand are consumed at the same time, especially the coal used for casting iron castings. Powder clay old sand brings serious black pollution to the environment, does not meet the needs of the scientific development of the foundry industry, does not meet the current environmental protection policy of reducing consumption and emission reduction and the requirements of the national ecological civilization construction. It has a negative impact on the health of foundry workers and the surrounding environment. adverse effects
[0004] Therefore, the current coal powder sand mainly has the following disadvantages: during the casting process, the temperature of the molten iron is about 1400, and after contacting the coal powder, it is partially burned and oxidized, and the coal powder burns and decomposes to produce nitrogen oxides, and carbon oxides pollute the environment
After repeated use of pulverized coal, the particle size distribution of the molding sand deteriorates, resulting in deterioration of casting quality
Coal powder leads to low strength of mixed molding sand

Method used

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  • Cast glass sand and preparation method thereof
  • Cast glass sand and preparation method thereof
  • Cast glass sand and preparation method thereof

Examples

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preparation example Construction

[0074] The invention provides a method for preparing cast glass sand, comprising:

[0075] A) mixing casting sand and bentonite to obtain the first mixture;

[0076] B) Mixing borax, water and the first mixture to obtain foundry glass sand.

[0077] The preparation method of casting glass sand provided by the invention firstly mixes casting sand and bentonite to obtain the first mixture.

[0078] Specifically, mix the foundry sand and bentonite in a sand mixer for 1 to 3 minutes, so that the sand and bentonite are fully mixed.

[0079] The specific proportions of the casting sand and bentonite in the present invention have been clearly described above, and will not be repeated here. The mixing temperature can be at room temperature.

[0080] After mixing, borax, water and the first mixture are combined to obtain foundry glass sand.

[0081] The present invention does not limit the specific manner of the mixing, and the mixing time is 2-8 minutes.

[0082] When nitrous is ...

Embodiment 1

[0092] Add 60kg sand with a particle size of 80 mesh and 10kg bentonite with 200 mesh for casting into the sand mixer and mix for 2 minutes to fully mix the sand and bentonite, then add 3kg of water, 0.1kg borax with 300 mesh, and 0.1kg nitrous and mix well Both obtained glass sand of the present invention, mixing time is 3 minutes.

[0093] figure 1 The glass sand diagram prepared by adding borax for Example 1 of the present invention; figure 2 For the same embodiment 1 but do not add the glass sand figure that borax prepares; Can see by figure figure 1 The sparkle here is the effect of molten liquid glass re-solidifying on the surface and voids of the sand; the voids are few and small. figure 2 There is no effect of solidification of molten liquid glass, and there are many sand gaps.

Embodiment 2

[0095] Casting 70kg sand with a particle size of 80 mesh and 20kg bentonite with 200 mesh are added to the sand mixer and mixed for 3 minutes to fully mix the sand and bentonite, then add 4kg of water, 300 mesh 0.2kg borax, and 0.2kg nitrous and mix well Both obtained glass sand of the present invention, mixing time is 5 minutes.

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Abstract

The invention provides cast glass sand. The cast glass sand comprises water as well as, by weight, 60-88 parts of casting sand, 6-30 parts of bentonite and 0.1-0.9 part of borax. The glass sand is prepared from the borax, bentonite and sand, and the borax is used as an anti-sticking additive and cosolvent. The glass sand provided by the invention is a glass body, is molten under high temperature,is used for filling a gap between mold sand, reducing the infiltration angle and preventing molten iron from infiltrating into the mold sand, and achieves the effect of good sand discharging performance. The glass sand has little solid waste emission, can be repeatedly used instead of being abandoned, and is friendly to the environment as being wholly inorganic matter. No gas is generated during casting and pouring, so that no pollution is caused to the environment. The mold sand is prevented from being degraded when cast.

Description

technical field [0001] The invention relates to the technical field of foundry industry, in particular to a casting glass sand and a preparation method thereof. Background technique [0002] In the existing foundry industry, molding sand is a material used for modeling in foundry. Molding sand is generally made by mixing molding materials such as foundry sand, molding sand binder and auxiliary additives in a certain proportion, and natural silica sand containing clay can also be used. Molding sand plays an extremely important role in foundry production, and the casting reject rate will increase due to unstable quality of molding sand. Usually, the performance index requirements for molding sand include: air permeability, strength, yield, collapse, fluidity, etc. [0003] In order to improve the surface quality of castings and reduce casting defects, additives are often added to the molding sand during the casting process. In the casting process, after the molten metal is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 李新忠
Owner 李新忠
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