Sodium silicate sand with high wet-compressive strength and preparation method thereof

Abstract

The invention discloses sodium silicate sand with high wet-compressive strength and a preparation method thereof. The sodium silicate sand with high wet-compressive is prepared from the following raw materials in parts by weight: 55-75 parts of silica sand, 30-40 parts of carborundum, 10-15 parts of limestone, 5-8 parts of bentonite, 3-6 parts of bauxite, 4-7 parts of modified sodium silicate, 2-3 parts of Arabic gum powder, 1-2 parts of dioctyl phthalate, 3-4 parts of lithium slag powder, 2-3 parts of talcum powder, 1.5-2.5 parts of gypsum, 1-2 parts of triisopropanolamine, 0.5-1 part of stearic acid and 3-5 parts of water. The sodium silicate sand disclosed by the invention is high in wet-compressive strength, easy to draw and repair, so that process requirements of drawing and then curing are completely satisfied. Moreover, the sodium silicate sand has good mobility, low gas evolution rate, good gas permeability and good collapsibility, can be used for remarkably improving the quality of a casting piece and lowering the rejection rate of the casting piece.

Description

technical field [0001] The invention relates to water glass sand with high wet compressive strength and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] In the past, clay molding sand was used in the production of large and medium-sized castings. After the mold was made, it was sent to a drying furnace for drying. The production cycle was long, the precision of the castings was poor, and the working conditions were poor, which was far from meeting the needs of production development. Sodium silicate sand has become one of the fastest-growing types of molding sand in recent decades due to its high fluidity, high compaction rate, fast hardening, high casting precision, wide source, low price, and environmental protection. At present, most steel castings and large iron castings are produced by water glass sand process. Although water glass sand has many advantages, it still has the disadvantage of low wet compressive ...

AI Technical Summary

Problems solved by technology

At present, most steel castings and large iron castings are produced by water glass sand process. Although water glass sand has many advantages, it still has the disadvantage of low wet compressive strength, which brings certain difficulties to mold drawing and repairing, and cannot meet the requirements. Process requirements for hardening after mold release