High-temperature-resistant purple knar molding sand and preparation method thereof

Abstract

High-temperature-resistant purple knar molding sand is prepared from the following raw materials in parts by weight: 2-3 parts of saturated aliphatic acid, 70-80 parts of blast furnace gas sludge, 160-180 parts of purple knar, 30-40 parts of obsidian, 30-40 parts of desulfurized ash, 28-33 parts of dead burnt magnesium oxide, 2-3 parts of potato residue powder, 11-13 parts of bentonite, proper amount of water, and 20-30 parts of an auxiliary agent. The molding sand employs blast furnace gas sludge, purple knar and other raw materials for granulation sintering, is good in heat resistance, good in air permeability and good in dispersity, and a casting has less blow hole phenomenon. By using potato residue powder, the molding sand is high in wet tensile strength and good in collapsibility, does not adhere to a casting. By using obsidian, the molding sand is good in lubricity and easy for molding.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-temperature-resistant Zimujie molding sand and a preparation method thereof. Background technique [0002] At present, there is a problem that the particle size of molding sand is difficult to control, which affects the yield and molding accuracy of castings. Also, there is a lack of special molding sand for different types of castings, so that the casting precision is not high and the yield rate is low. [0003] Traditional clay molding sand has many advantages, but it has the disadvantages of being difficult to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution. Zimujie clay has better characteristics than ordinary clay, and can withstand higher temperatures after sintering, so it can be used as a raw material for molding sand. [0004] The above shortcomings need to be improved. C...

AI Technical Summary

Problems solved by technology

[0002] At present, there is a problem that the particle size of the molding sand is difficult to control, which affects the yield and molding accuracy of castings.

In addition, there is a lack of special molding sand for different types of castings, resulting in low casting precision and low yield

[0003] Traditional clay molding sand has many advantages, but it has the disadvantages of being difficult to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution.