Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand

Abstract

The invention discloses highly fire-resistant foundry sand for steel casting and a preparation method of the highly fire-resistant foundry sand. The highly fire-resistant foundry sand is prepared from the following raw materials in parts by weight: 50-80 parts of fused ceramite, 10-15 parts of high-alumina cement, 17-23 parts of sludge dry powder, 20-30 parts of volcanic tuff, 15-25 parts of dickite, 16-22 parts of natural manganese sand, 8-12 parts of nacrite, 10-15 parts of asbestos powder, 5-10 parts of aluminum dihydrogen tripolyphosphate, 10-15 parts of modified bentonite, 4-8 parts of alumn powder, 3-6 parts of cellulose glycolate, 2.5-4.5 parts of corn syrup, 4.5-6.5 parts of beryllium oxide, 3-5 parts of China wood oil, 4-6 parts of sodium metasilicate, 2-4 parts of polyethylene glycol and an appropriate amount of water. Compared with conventional foundry sand, the highly fire-resistant foundry sand provided by the invention is not only excellent in fire-resistant performance, can maintain a higher strength and relatively low thermal expansion coefficient under high temperature, does not easily cause expansion and breakage, has excellent plasticity, air permeability and collapsibility, can remarkably improve the surface quality of castings and improve the finished product rate of castings.

Description

technical field [0001] The invention relates to high refractory molding sand for steel casting and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Molding sand is the material used for molding in casting. 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. The role of molding sand in foundry production is extremely important, and the casting waste caused by poor quality of molding sand accounts for about 30-50% of the total casting waste. The usual requirements for molding sand are: ① High strength and thermal stability to withstand various external forces and high temperatures; ② Good fluidity, that is, the ability of the molding sand to move between sand particles under the action of external force or its own gravity; ③Certain plasticity, that is, the ability of the molding sand to deform under the action ...

AI Technical Summary

Problems solved by technology

With the continuous development of casting technology, the requirements for the refractory performance of molding sand are getting higher and higher, but the molding sand on the existing market cannot meet the above requirements. Under high temperature conditions, molding sand is prone to expansion and fragmentation, and castings are prone to sand sticking Defects, which affect the casting of castings