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Method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand

A technology of phenolic resin and self-hardening sand, applied in manufacturing tools, casting equipment, molds, etc., can solve problems such as quality cannot meet requirements, and achieve the effect of saving energy, saving silica sand resources, and protecting the ecological environment

Active Publication Date: 2013-06-12
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The equipment manufacturing industry is a pillar industry in my country, and castings are the basic parts of the equipment manufacturing industry. In 2010, the output of castings in my country was 39.6 million tons, including 5.3 million tons of steel castings. With the development of the equipment manufacturing industry, it is facing the needs of domestic and foreign markets , our country pays more and more attention to the improvement of casting quality, using traditional water glass CO 2 Steel castings are produced by the method, and its quality can no longer meet the requirements

Method used

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  • Method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand
  • Method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand
  • Method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand

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Experimental program
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Effect test

Embodiment 1

[0045] First, pretreat the recovered alkaline phenolic resin self-setting sand waste sand: (1) sieve with a 6-mesh sieve (3.35mm in sieve diameter) to remove impurities in the waste sand; (2) sift the sieved waste sand Sand is separated by magnetic separation to remove iron-containing particles; (3) Use a ball mill to grind alkaline phenolic resin self-setting sand waste sand to make the particle diameter less than 0.075mm, increase its surface area, and help increase the chemical reaction speed during melting , to shorten the reaction time; (4) The powder is separated by secondary magnetic separation to remove iron impurities. Purified waste sand powder and soda ash are used as main raw materials. The chemical composition and mass percentage of the basic resin self-setting waste sand should meet the following requirements: SiO 2 : 90-97%, CH 3 COONa: 0.5-3.5%, CH 3 COOK: 0.5-6.2%, others: balance.

Embodiment 2

[0047] The chemical composition of the alkaline phenolic resin no-hardening sand waste sand that adopts embodiment 1 method to process is: SiO 2 : 90.1%, CH 3 COO Na: 3.4%, CH 3 COOK: 2.9%, others: 3.6%.

[0048] Soda ash is secondary soda ash for industrial use, Na 2 CO 3 The content is 98.5%.

[0049] Feeding mass ratio: waste sand 60%, soda ash 40%, mix with a mixer, use a feeder to feed horseshoe flame foam soda kiln at a feed rate of 35Kg per minute, heat with gas, and control the furnace temperature at 1380-1420°C , furnace charge melts, reacts to generate sodium silicate, potassium silicate, and flows into water quenching, granulation, lifting, dehydration, packing from discharge opening, gets sodium silicate and potassium silicate mixed solid water glass, and its chemical composition is: SiO 2 : 66.80%, Na 2 O: 29.70%, K 2 O: 2.10%, others: balance. Record it as M2.21.

Embodiment 3

[0051] The chemical composition of the alkaline phenolic resin no-hardening sand waste sand that adopts embodiment 1 method to process is: SiO 2 : 91.5%, CH 3 COO Na: 1.5%, CH 3 COOK: 6.1%, others: balance.

[0052] Soda ash is the first grade soda ash for industrial use, Na 2 CO 3 The content is 99%.

[0053] Feeding quality proportioning: waste sand 62.5%, soda ash 37.5%, mix with mixer, feeding, melting, granulation process are the same as embodiment 2. Get sodium silicate and potassium silicate mixed solid water glass, its chemical composition is: SiO 2 : 71.02%, Na 2 O: 27.36%, K 2 O: 0.68%, others: balance. It is recorded as M2.58.

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Abstract

The invention provides a method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand. The method comprises the steps of melting waste foundry sand and soda ash as main raw materials to prepare a sodium silicate and potassium silicate mixture; and mixing granules of the sodium silicate and potassium silicate mixture, sodium hydroxide, potassium hydroxide, water, and a modifier according to a required proportion, feeding into a steam of 0.6-0.8 MPa, heat preserving for 1 h-4 h at a temperature of 158 DEG C-169 DEG C, dissolving the sodium silicate and potassium silicate in water and mixing uniformly to obtain the water glass used for foundry. According to the method, the waste sand generated in an alkaline phenolic resin waste self-hardening sand process can be used comprehensively and solid waste emissions are reduced, thereby facilitating protection of ecological environment, reducing production cost of the water glass and saving some energy.

Description

technical field [0001] The invention belongs to the technical field of molding materials of casting technology, and in particular relates to a method for preparing water glass for casting by using alkaline phenolic resin casting waste sand. Background technique [0002] The equipment manufacturing industry is a pillar industry in my country, and castings are the basic parts of the equipment manufacturing industry. In 2010, the output of castings in my country was 39.6 million tons, including 5.3 million tons of steel castings. With the development of the equipment manufacturing industry, it is facing the needs of domestic and foreign markets , our country pays more and more attention to the improvement of casting quality, using traditional water glass CO 2 Steel castings are produced by the law, and their quality can no longer meet the requirements. Using alkaline phenolic resin self-setting sand to produce steel castings can significantly improve the internal and external q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/18
Inventor 余明伟金广明汪解民
Owner SHENYANG HYATON FOUNDRY MATERIAL
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