Re-molten spherical alumina casting sand and its prepn

Abstract

The present invention relates to the formation technology of thermosetting material, and the re-molten spherical alumina casting sand is produced with alumyte or incinerated alumyte tail ore as material. The casting sand has the components including alumina 70-80 wt%, silica 10-20 wt%, ferric oxide less than 5 wt%, and titanium oxide less than 5 wt%. Its production process includes incineration of alumyte under 1000-1400 deg.c for 1-2 hr; blowing incinerated alumyte in molten state inside an electric arc furnace to make spheres; and sieving to take 0.1-2.9 mm grains as the casting sand product. The casting sand product has good heat resistance, high collapsibility, good demolding performance, low powdered and volatile component content, high mechanical strength, and other advantages and may be used in high precision casting mold.

Description

technical field [0001] The invention belongs to casting or a technology mainly used for thermosetting material molding, in particular to remelted aluminum spherical casting sand and its preparation method. Background technique [0002] The raw materials of foundry sand in the prior art are mainly shiying sand, Luo ore sand, coated sand, remelted magnesia and the like. Its components are mainly magnesium oxide and silicon oxide. Its application is relatively common, and its preparation technology is relatively mature. But there are still many deficiencies, such as: poor high temperature resistance, poor collapsibility, and it is difficult to achieve high-precision casting. Poor mechanical strength, high silt content, and large heat release gas are not conducive to casting, but also pollute the environment and are harmful to the health of operators. The material reuse rate is low and the production cost is high. Contents of the invention [0003] The purpose of the prese...

AI Technical Summary

Problems solved by technology

But there are still many deficiencies, such as: poor high temperature resistance, poor collapsibility, and it is difficult to achieve high-precision casting

Poor mechanical strength, high amount of silt, large amount of heat release gas, which is not conducive to casting, but also pollutes the environment and is harmful to the health of operators

Low material reuse rate and high production cost