Several Problems in the Foundry Technology of Sodium Silicate Sand
Release time: 2020-06-22 11:19:00.000
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The main advantages of CO2 gas hardening water glass sand are: high hardening speed, high strength; After hardening die, casting precision is high.
The disadvantages of common CO2 hardening sodium silicate sand are: mold (core) sand strength is low, the amount of sodium silicate (by mass) often reaches 7-8% or more; Water content is high and easy to absorb moisture; The hardness and permeability are poor in winter; Because of the poor collapsibility, the used sand is difficult to be recycled and a large number of used sand is abandoned, which causes alkaline pollution to the environment.
2. Organic ester self-hardening method
In this process, liquid organic ester is used as the hardener of sodium silicate instead of CO2.
The advantages of this hardening process are: mold (core) sand has high strength, the amount of sodium silicate can be reduced to less than 3.5%; The hardening speed can be adjusted by changing the kinds of binder and curing agent (5 ~ 150 min) in accordance with the production and environmental conditions; The mould (core) sand has good collapsibility, the casting sand is easy to clean up, the used sand is easy to be recycled by dry method, and the recycling rate is more than 80%, the environmental pollution of sodium silicate alkaline waste sand is reduced, the transportation and land occupation cost of waste sand are saved, and the silica sand resources are saved;The molding sand has good hot plasticity and low gas evolution, and can overcome the defects of cracks and blowholes which are easy to occur in the production of steel castings by furan resin sand. The technological problems of CO 2 sodium silicate sand, such as poor stability of sand mould surface and easy overblow, can be overcome, and the quality and dimensional accuracy of castings can be compared with those of resin sand. The production cost of the no-bake sand process used is relatively low and the working conditions are good.
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