Preparation method of mixed binder for green sand

Abstract

The invention relates to a preparation method of a mixed binder for green sand. The preparation method comprises the following specific steps: uniformly mixing 10-15 parts of silicon dioxide powder, 2-5 parts of monocrystalline silicon powder, 2-6 parts of pulverized coal and 3-6 parts of aluminum potassium sulfate to obtain a material I; respectively grinding 8-60 parts of montmorillonite, 10-15 parts of kaolin, 12-18 parts of yellow sand, 4-7 parts of diopside, 6-9 parts of chromite sand, 7-12 parts of riebeckite and 3-5 parts of siliceous shale, sieving by a 200-mesh sieve, and uniformly mixing to obtain a material II; taking 9-13 parts of Zisha clay and 3-4 parts of bentonite, respectively sieving with the 200-mesh sieve, and uniformly mixing to obtain a material III; mixing and evenly distributing the first material prepared in the first step, the second material prepared in the second step and the third material prepared in the third step to obtain a material IV; adding water into the material IV prepared in the step IV, and uniformly mixing to obtain the mixed binder for green sand. The preparation method has the beneficial effects that the production cost of the green sand is reduced, and the green sand is relatively high in air permeability and relatively high in hot tensile strength.

Description

technical field [0001] The invention relates to a preparation method of a binder, in particular to a preparation method of a mixed binder for green sand. Background technique [0002] Green casting refers to the casting method in which the sand mold is cast directly without drying after it is made. Green sand is widely used, and the quality of green sand affects the yield of castings. At present, there are many chemicals mixed in the existing green sand. The production cost of molding sand is relatively high, and the produced green sand has poor air permeability and low thermal tensile strength. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a mixed binder for green sand, which solves the problem that there are many chemicals mixed in the existing green sand, the production cost of green sand is high, and the produced wet Molding sand has poor air permeability and low hot tensile strength...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a mixed binder for green sand, which solves the problem that there are many chemicals mixed in the existing green sand, the production cost of green sand is high, and the produced wet Molding sand has poor air permeability and low hot tensile strength