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High-quality moulding sand

A kind of molding sand and high-quality technology, applied in the field of foundry sand, can solve the problems of poor surface finish, high mud content, high water content, poor air permeability of molding sand, etc., and achieve the effect of improving molding sand performance, molding sand performance and surface quality.

Inactive Publication Date: 2017-11-24
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. Coal powder is usually used as carbon additives in existing molding sand. Improve the performance of the molding sand, but the addition of coal powder will cause poor collapsibility of the molding sand, high mud content and high water content, resulting in poor surface finish of the produced castings, high rejection rate caused by the molding sand, and poor air permeability of the molding sand. Poor, low wet compressive strength, poor stability

Method used

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Experimental program
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Effect test

Embodiment 1

[0016] A high-quality molding sand, which is made by uniformly mixing raw sand, molding sand binder and auxiliary additives in a mass ratio of 100:5:0.5;

[0017] The raw sand is quartz sand; the molding sand binder is bentonite; the auxiliary additive is modified pine nut shell powder;

[0018] The modified pine nut shell powder is made of the following components in parts by weight: pine nut shell 70, modified diatomite 5;

[0019] The modified diatomite is modified by urea and halloysite powder under alkaline conditions, wherein the mass ratio of urea, halloysite powder and diatomite is 1:3:20.

[0020] Further, the particle size of the quartz sand is 75 mesh.

[0021] Further, the bentonite is sodium bentonite, and the particle size of sodium bentonite is 500 mesh.

[0022] Further, the preparation method of the modified diatomite is as follows: uniformly mix halloysite powder and sodium hydroxide solution with a mass fraction of 5% in the ratio of 2g:100ml, heat to 80°C...

Embodiment 2

[0026] A kind of high-quality molding sand, which is made by uniformly mixing raw sand, molding sand binder and auxiliary additives in a mass ratio of 105:8:0.8;

[0027] The raw sand is quartz sand; the molding sand binder is bentonite; the auxiliary additive is modified pine nut shell powder;

[0028] The modified pine nut shell powder is made of the following components in parts by weight: pine nut shell 780, modified diatomite 8;

[0029] The modified diatomite is modified by urea and halloysite powder under alkaline conditions, wherein the mass ratio of urea, halloysite powder and diatomite is 1:3:20.

[0030] Further, the particle size of the quartz sand is 75 mesh.

[0031] Further, the bentonite is sodium bentonite, and the particle size of sodium bentonite is 500 mesh.

[0032] Further, the preparation method of the modified diatomite is as follows: uniformly mix halloysite powder and sodium hydroxide solution with a mass fraction of 5% in the ratio of 2g:100ml, hea...

Embodiment 3

[0036] A high-quality molding sand, which is made by uniformly mixing raw sand, molding sand binder and auxiliary additives in a mass ratio of 102:6:0.6;

[0037] The raw sand is quartz sand; the molding sand binder is bentonite; the auxiliary additive is modified pine nut shell powder;

[0038] The modified pine nut shell powder is made of the following components in parts by weight: pine nut shell 75, modified diatomite 6;

[0039] The modified diatomite is modified by urea and halloysite powder under alkaline conditions, wherein the mass ratio of urea, halloysite powder and diatomite is 1:3:20.

[0040] Further, the particle size of the quartz sand is 75 mesh.

[0041] Further, the bentonite is sodium bentonite, and the particle size of sodium bentonite is 500 mesh.

[0042]Further, the preparation method of the modified diatomite is as follows: uniformly mix halloysite powder and sodium hydroxide solution with a mass fraction of 5% in the ratio of 2g:100ml, heat to 80°C,...

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Abstract

The invention discloses high-quality moulding sand, and relates to the technical field of moulding sand casting. The high-quality moulding sand is prepared by mixing roughing sand, a moulding sand binder and an additive. The roughing sand is quartz sand. The moulding sand binder is bentonite. The additive is pine nut shell modified powder. The pine nut shell modified powder is prepared from, by weight, 70-80 parts of pine nut shells and 5-8 parts of modified kieselguhr. The modified kieselguhr is kieselguhr formed by carrying out modification treatment on urea and halloysite powder under the alkaline condition. The prepared high-quality moulding sand has the excellent green compression strength and stable gas generation quantity, and the quality of a casting can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of foundry molding sand, and in particular relates to high-quality molding sand. Background technique [0002] Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. Coal powder is usually used as carbon additives in existing molding sand. Improve the performance of the molding sand, but the addition of coal powder will cause poor collapsibility of the molding sand, high mud content and high water content, resulting in poor surface finish of the produced castings, high rejection rate caused by the molding sand, and poor air permeability of the molding sand. Poor, low wet compressive strength, poor stability. Contents of the invention [0003] The object of the present invention is to provide a kind of high-quality molding sand aiming at the existing p...

Claims

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Application Information

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IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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