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Forsterite spherical sand and preparation method and application thereof

A forsterite and spherical sand technology, applied in the field of precision casting materials, can solve the problems of limited use range, many surface holes, large angle coefficient, etc., and achieve the effect of high recycling rate, dense surface without holes, and low angle coefficient.

Pending Publication Date: 2021-01-22
ZHANGWU COUNTY LIAN XIN FOUNDRY SILICON SAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Natural forsterite sand is often used as molding material in casting. However, because natural forsterite sand is formed by crushing, most of the sand grains are pointed and have a large angle coefficient. The forsterite sand has many pores on the surface, requires a large amount of binder, and the strength of the sand core is low, which greatly limits its application range.

Method used

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  • Forsterite spherical sand and preparation method and application thereof

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preparation example Construction

[0028] The preparation method of forsterite spherical sand provided by the present invention specifically comprises the following steps:

[0029] (1) The magnesite, quartz sand and flux are crushed and powdered respectively, and the fineness of the powder is required to pass through a 400-mesh sieve, that is, a powder material with a particle size of less than 0.038mm;

[0030] (2) Mix the above three powders according to a certain ratio, and the ingredients require MgO and SiO in the mixture 2 The molar ratio of the molar ratio is ≥2:1, and then the powder is mixed evenly with a mixer. The main raw materials are magnesite and quartz sand, and the flux includes one or a combination of nickel slag, bauxite and kaolin ;

[0031] Among them, the content of MgO in magnesite ≥ 45wt% (such as ≥ 45wt%, ≥ 50wt%, ≥ 65wt%, ≥ 80wt%); SiO in quartz sand 2 Content ≥ 90wt% (≥ 90wt%, ≥ 95wt%, ≥ 98wt%); CaO content ≤ 4wt%, Al 2 o 3 Content≤5wt%;

[0032] (3) A certain amount of mixed raw...

Embodiment 1

[0040] The preparation method of the forsterite spherical sand provided by the present embodiment specifically comprises the following steps:

[0041] 1), milling: respectively making magnesite ore, quartz sand and nickel slag into fine powder below 400 mesh;

[0042] 2) Ingredients: Take the raw materials of magnesite powder, quartz powder and nickel slag powder, and measure them respectively, according to the molar ratio of MgO:SiO 2 ≥2:1, take 72 parts of magnesite powder, 25 parts of quartz powder, and 3 parts of nickel slag powder for batching, and mix them evenly in the mixer;

[0043]3), granulation: take a certain amount of the above-mentioned mixture and place it in a granulator, spray atomized binder into the granulator, the binder is a PVA aqueous solution with a mass concentration of 0.5%, and start granulation. During the granulation process, dry powder is added in batches according to the degree of dryness and humidity of the material. The number of dry powder a...

Embodiment 2

[0053] The preparation method of the forsterite spherical sand provided by the present embodiment specifically comprises the following steps:

[0054] 1), milling: respectively making magnesite ore, quartz sand and nickel slag into fine powder below 400 mesh;

[0055] 2) Ingredients: Take the raw materials of magnesite powder, quartz powder and nickel slag powder, and measure them respectively, according to the molar ratio of MgO:SiO 2 ≥2:1, take 60 parts of magnesite powder, 20 parts of quartz powder, and 1 part of nickel slag powder for batching, and mix them evenly in the mixer;

[0056] 3), granulation: take a certain amount of the above-mentioned mixture and place it in a granulator, spray atomized binder into the granulator, the binder is a PVA aqueous solution with a mass concentration of 0.3%, and start granulation. During the granulation process, dry powder is added in batches according to the degree of dryness and humidity of the material. The number of dry powder a...

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Abstract

The invention provides forsterite spherical sand and a preparation method and application thereof, magnesite and quartz sand are used as main raw materials, and the forsterite spherical sand is obtained by crushing, pulverizing, mixing, granulating, drying, screening and sintering. The forsterite spherical sand has the advantages of being low in angular coefficient, round in grain shape, compact in surface, free of holes, high in sand core strength, low in thermal expansion coefficient, alkaline in chemical property and the like, the forsterite spherical sand and MnO2 in high manganese steel molten metal are not prone to chemical reaction, meanwhile, the repeated utilization rate of theforsterite spherical sand is high, the casting requirement can be met, the using amount of a casting binder can be reduced, the casting cost is reduced, and meanwhile, the emission of casting industrial waste gas is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of precision casting materials, in particular to a forsterite spherical sand and its preparation method and application. Background technique [0002] High manganese steel (ZGMn 13 ) is a high-alloy steel with a manganese content of about 13%. Because of its good work hardening performance, it has excellent wear resistance and good toughness under the working conditions of impact abrasive wear, especially under strong load impact, so it is still a kind of anti-wear commonly used in countries all over the world. steel. It is widely used in metallurgy, mining, electric machinery, railway transportation, construction machinery and so on. [0003] Due to the high manganese content of high manganese steel, the molten steel is alkaline, so when casting, if traditional quartz sand is used, it will be because the quartz sand is an acidic material, and the SiO 2 MnO in highly alkaline high manganese steel molten ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/20C04B35/622C04B35/64B22C1/00
CPCC04B35/20C04B35/62204C04B35/64B22C1/00C04B2235/3217C04B2235/349C04B2235/3418C04B2235/3206C04B2235/5436C04B2235/656C04B2235/6567
Inventor 张雅丹钟飞升常成张希兴李家波
Owner ZHANGWU COUNTY LIAN XIN FOUNDRY SILICON SAND
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