Mixed clay for environment-friendly wet mold casting and preparation method thereof

Abstract

The invention discloses an environment-friendly mixed soil for wet casting, which comprises raw coal powder, bentonite and dust-proof slurry, wherein the raw coal powder, bentonite and dust-proof slurry are uniformly dispersed, and the weight of the dust-proof slurry is the raw coal 3%~8% of the total weight of powder and bentonite; the dust-proof slurry is a solution of polyvinyl alcohol, xylitol, cellulose compound, α-starch, monosaccharide or disaccharide, or polyvinyl alcohol, A mixed solution of two or more of xylitol, cellulose compound, α-starch, monosaccharide or disaccharide. The surface of the powdered coal particles and bentonite particles of the mixed soil for wet casting of the present invention is coated with a layer of dust-proof slurry film, which will not affect the mechanical airflow of the mixed soil during dry mixing and feeding while suppressing dust, and will not It will affect the fluidity of green sand; while maintaining the functions of coal powder and bentonite, the components of the slurry are also conducive to improving the performance of green sand, and these components can be used as additives for improving the performance of molding sand.

Description

technical field [0001] The invention relates to an environment-friendly mixed soil for wet casting and a preparation method thereof. Background technique [0002] Green casting is the most widely used and most convenient molding method, and green sand accounts for about 60% to 70% of all sand mold usage. [0003] Green sand is composed of raw sand, clay, additives and water in a certain proportion. Both bentonite and coal powder are additives in green sand, and the composite molding sand additive obtained by mixing a certain proportion of bentonite and coal powder is called mixed soil. [0004] The function of pulverized coal is to prevent sand sticking and sand inclusion scarring in iron castings, and improve the collapsibility of molding sand. Bentonite is used as a molding sand binder. [0005] The reason why coal powder has the ability of anti-sticking sand and anti-sand inclusion is that the volatile matter in coal powder can be pyrolyzed into a layer of shiny carbon...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the relatively serious dust raising problem of the existing mixed soil, and an environment-friendly mixed soil for wet mold casting with extremely low dust emission and its preparation method are provided