Method for regenerating and utilizing discarded silicasol case

Abstract

The invention relates to a reproduction and utilization of wasted silicasol skin. It crushes and sorts out the wasted silicasol skin to get material with the size 14-18, further screening it to get those 58-62, grinding those selected from 180-270180-270, replacing those ground quartz and so on to make sodium silicate shell. It can improve the feature of the cast mold shell with reduced manufacturing cost for the benefit of the environment.

Description

Technical field: [0001] The invention relates to a waste recycling method, in particular to a waste silica sol mold shell recycling method which can significantly improve the performance of investment casting mold shells, reduce manufacturing costs, and be beneficial to environmental protection. Background technique: [0002] Precision castings are produced by investment casting. Investment casting includes manufacturing wax patterns, forming shell blanks on wax patterns, dewaxing, roasting shell blanks to make shells, pouring high-temperature molten steel, cleaning and other processes. Usually, after a batch of precision castings are produced, the shells become waste. things. [0003] Existing investment casting shells include silica sol shells, water glass shells, and the like. The silica sol shell blank is firstly made of zirconium (zirconia) powder (sand) with stable performance and expensive price as the surface layer, and the slurry is mixed with silica sol and mulli...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the high price of zirconium powder (sand) for the silica sol shell, the relatively cheap mullite powder (sand) is used for the back layer. , refractoriness, thermal conductivity, thermochemical and other performance indicators are lower than zirconium powder (sand), and there will be some phenomena such as poor calcination, uneven volume expansion at high temperature, and bursting, which affect the surface quality of precision castings and shells On the other hand, although the price of mullite powder (sand) is cheaper than that of zirconium powder (sand), the price itself is still relatively high, resulting in high cost of silica sol shells;

[0006] 2. Although the cost of water glass shell is low and the price is cheap, because the surface layer and the back layer do not contain zirconium powder (sand), its strength, surface finish and other indicators are far lower than those of silica sol shells.