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Method for preparing casting-use water glass by using casting waste sand

A technology for casting waste sand and water glass, which is used in foundry molding equipment, machinery for cleaning/processing mold materials, molds, etc., to achieve the effect of saving silica sand resources, reducing mining, significant economic value and social value

Active Publication Date: 2013-03-20
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this process still produces 15%-20% waste sand, about 30000 t molding sand is needed to produce 10,000 tons of castings, and 4500-6000 t waste sand is produced

Method used

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  • Method for preparing casting-use water glass by using casting waste sand
  • Method for preparing casting-use water glass by using casting waste sand
  • Method for preparing casting-use water glass by using casting waste sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The chemical composition of waste sand using ester hardened sodium silicate sand is: SiO 2 : 82.1%, CH 3 COO Na: 11%, CH 3 COOK: 2.9%, others: 4.0%.

[0049] Soda ash is secondary soda ash for industrial use, Na 2 CO 3 The content is 98.5%.

[0050] Feeding mass ratio: waste sand 60%, soda ash 40.%, mix with a mixer, add horseshoe flame foam soda kiln with a feeder at a feed rate of 35 Kg per minute, heat with gas, and control the furnace temperature at 1380- At 1420°C, the furnace material melts and reacts to form sodium silicate and potassium silicate, which flows out of the discharge port into water for quenching, granulation, lifting, dehydration, and packaging to obtain solid water glass mixed with sodium silicate, silicon and potassium silicate. For: SiO 2 : 66.00%, Na 2 O: 29.70%, K 2 O: 1.10%, others: balance.

[0051] Denote it as M2.2.

Embodiment 2

[0053] The chemical composition of waste sand using ester hardened sodium silicate sand is: SiO 2 : 90%, CH 3 COO Na: 7.0%, CH 3 COOK: 1.8%, others: 1.2%.

[0054] Soda ash is the first grade soda ash for industrial use, Na 2 CO 3 Content 99%.

[0055] Ratio of feeding mass: waste sand 62.5%, soda ash 37.5%, mix with a mixer, use a feeder to add horseshoe flame foam soda kiln at a feeding speed of 35 Kg per minute, heat with natural gas, and control the furnace temperature at 1380- At 1420°C, the furnace material melts and reacts to form sodium silicate and potassium silicate, which flows out from the discharge port into water for quenching, granulation, lifting, dehydration, and packaging to obtain mixed solid water glass of sodium silicate and potassium silicate. Its chemical composition For: SiO 2 : 71.02%, Na 2 O: 27.36%, K 2 O: 0.68%, others: balance. Denote it as M2.6.

Embodiment 3

[0057] The chemical composition of waste sand using ester hardened sodium silicate sand is: SiO 2 : 95%, CH 3 COO Na: 3.5%, CH 3 COOK: 1.0%, others: 0.5%.

[0058] Soda ash is the first grade soda ash for industrial use, Na 2 CO 3 The content is 99%.

[0059] Feeding mass ratio: waste sand 66.2%, soda ash 33.8%, mix with a mixer, use a feeder to add horseshoe flame foam soda kiln at a feed rate of 35 Kg per minute, heat with gas, and control the furnace temperature at 1380-1420 ℃, the furnace material melts, reacts to form sodium silicate and potassium silicate, and flows into the water from the discharge port to quench, granulate, lift, dehydrate, and package to obtain mixed solid water glass of sodium silicate and potassium silicate. Its chemical composition is :SiO2 2 : 75.41%, Na 2 O: 23.81%, K 2 O: 0.38%, others: balance.

[0060] Recorded as M3.1.

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Abstract

The invention relates to a method for preparing casting-use water glass by using casting waste sand. Casting waste sand produced during ester-hardened water glass sand process and soda ash are prepared into sodium silicate and potassium silicate; sodium silicate and potassium silicate mixture particles, sodium hydroxide, potassium hydroxide, water, and a modifying agent are mixed according to a ratio requirement; steam with a pressure of 0.6-0.8MPa is delivered in; a temperature is maintained for 1-4h at 158-169 DEG C; and sodium silicate and potassium silicate are dissolved in water; and the mixture is well mixed, such that the casting-use water glass is obtained. A method for carrying our shaping and core-making by using the casting-use water glass as an adhesive comprises the steps that: washed silica sand, artificial silica sand, shaped silica sand, zircon sand, or regenerated old sand thereof are adopted as main raw materials; a CO2 blowing hardening method, an ester hardening method, or the like is adopted as a hardening process. The method provided by the invention has high actual operation performance, and has predictable substantial economic value and social value.

Description

technical field [0001] The invention relates to the technical field of molding materials for casting technology in the equipment manufacturing industry, and in particular provides a method for manufacturing water glass for casting by using foundry 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 36.5 million tons. With the development of the equipment manufacturing industry, the output of castings in my country has increased year by year, and the demand for casting binders has increased simultaneously. Binders for casting include: resinous organic binders, water glass and other inorganic binders. The price of artificial synthetic resin has increased significantly with the price increase of materials and energy, which has reduced the profit of casting production. Resin binder is used in c...

Claims

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Application Information

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IPC IPC(8): B22C5/00B22C1/18
Inventor 金广明余明伟
Owner SHENYANG HYATON FOUNDRY MATERIAL
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