Method for regenerating and utilizing discarded silicasol case

A technology of silica sol and mesh sieve, which is applied in the direction of casting moulds, cores, casting molding equipment, etc., can solve the problems affecting the surface quality of precision castings and shell life, strength, low surface finish, and high cost of silica sol shells. Achieve the effects of good thermal shock stability, improved comprehensive performance indicators, and strong crack resistance

Inactive Publication Date: 2007-08-08
关伟 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Crush the waste silica sol mold shell. If the mold shell is wet, it should be dried first to meet the requirements of crushing; use a 14-18 mesh sieve to screen to obtain 14-18 mesh sieves, and it is best to use a 16-mesh sieve , to get 16 mesh sieve;

[0033] b. Use a 58-62 mesh sieve to further screen the 14-18 mesh sieve to obtain a 58-62 mesh sieve as sand material, preferably use a 60-mesh sieve to further sieve to obtain a 60-mesh sieve as sand material ;

[0034] c. Take the 58-62 mesh sieve and finely grind it into 180-270 mesh powder;

[0035] d. In the process of forming the shell blank on the wax pattern in investment casting, replace the mullite powder with 180-270 mesh powder and mix it with silica sol to form the intermediate bonding layer (transition layer), and ensure the working viscosity for 12 seconds Left and right, use sand material (58-62 mesh sieve) instead of mullite, and sprinkle it on the middle bonding layer to form a back layer (reinforc...

Embodiment 2

[0039] Others are the same as in Example 1, except that step d uses powder instead of mullite powder and mixes it with silica sol to form a slurry. If the powder is dry, distilled water needs to be added. The weight ratio of silica sol, distilled water and powder is 100:23-25 : 173-177.

Embodiment 3

[0041] Others are the same as in Examples 1 and 2, except that the 14-18 mesh sieves produced in step a are used as raw materials (including steel particles in the discarded shells, etc.), are refined into molten steel at high temperature, and are cooled to make steel material .

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B22C1/00
Inventor 关伟关海峰
Owner 关伟
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