Method for molding cast steel, method for recycling and regenerating fresh sand and mould sand, and reclaimed sand

Abstract

The invention discloses a method for molding a cast steel part. Quartz sand is adopted as a sand mixture during molding and is matched with water glass and organic ester. The invention also discloses a sand mixture which contains the quartz sand as the main component. The invention discloses a method for recycling the sand mixture furthermore, and in the method, the sand mixture is recycled and reused after the steps of crushing, filtering and calcining the sand mixture. The invention also discloses reclaimed sand obtained by the method of recycling the sand mixture. The sand mixture has good storage performance, low hydroscopic property and high strength and is fit for the characteristic of the long molding period of the large cast steel part better; the sand mixture has good collapsibility and is easy for cleaning sand, thereby reducing the labor intensity; a manufacture cast after molding has good surface quality, and adhering sand, shakeout sand and air holes are reduced obviously; the used sand mixture can be recycled, thereby solving the problem of using waste sand, reducing the cost and reducing the environmental pollution.

Description

technical field [0001] The invention relates to a molding method of a steel casting. The present invention also relates to a molding sand used in the molding method of the steel casting. The present invention further relates to a method for recovering and regenerating molding sand after adopting the molding method of the steel casting. The present invention also relates to regenerated sand obtained after the above molding sand recovery and regeneration method. Background technique [0002] At present, CO is widely used in the production of extra-large steel castings. 2 - Water glass sand craft as molding material. Due to CO 2 -The water glass sand process has defects such as high hygroscopicity of the molding sand, poor storage, poor collapsibility, difficulty in sand production, and castings are prone to sand sticking, sand falling and pores, especially CO 2 -The old sand of sodium silicate sand is difficult to regenerate and recycle, and a large amount of waste sand i...

AI Technical Summary

Problems solved by technology

Due to CO 2 -The water glass sand process has defects such as high hygroscopicity of the molding sand, poor storage, poor collapsibility, difficulty in sand production, and castings are prone to sand sticking, sand falling and pores, especially CO 2 -The old sand of water glass sand is difficult to regenerate and recycle, and a large amount of waste sand is discharged, which seriously pollutes the environment

Therefore, CO 2 -The water glass sand process has been difficult to meet the quality, production requirements and environmental protection requirements of steel castings, especially extra-large steel castings