Preparation method of casting water glass

A technology for water glass and industrial use, which is applied in the field of preparation of water glass for casting. It can solve the problems that the wet process has not been popularized and applied in large quantities, has a lot of solid residues, and endangers the ecological environment, so as to improve the working environment of workers and benefit the environment. Effect of protecting and reducing environmental damage

Active Publication Date: 2010-03-03
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1. Long reaction time and low production efficiency;
[0012] 2. The modulus of water glass production is low, modulus ≤ 2.2, and the market demand is limited;
[0013] 3. There are many solid re...

Method used

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  • Preparation method of casting water glass
  • Preparation method of casting water glass
  • Preparation method of casting water glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Ratio of feeding: quartz powder 209kg, industrial solid sodium hydroxide 129kg, water 165kg, steam 150kg.

[0054] Put the material into the mixing tank and stir evenly, pump it into the autoclave with a mortar pump, close the feeding port, feed steam, and keep warm at 0.6MPa for 2 hours. Continue to feed steam, keep warm at 0.9MPa for 10h, release the pressure to 0.3MPa, open the discharge port, press the product into the intermediate tank with the residual pressure in the autoclave to cool, when the material drops below 70°C, put the material Go to the separation tank, use a plate suction filter to suck the liquid material into the storage tank, receive 608kg of liquid material, and let it stand for 72h, including 574kg of transparent liquid water glass, which is recorded as S 1 , cloudy water glass 34kg, denoted as yS 1 , Separated unreacted matter 45kg. The modulus of water glass is 2.3 and the density is 1.50g / cm 3 .

Embodiment 2

[0056] Feeding ratio: 204kg of quartz powder, 126kg of industrial solid sodium hydroxide, 9kg of solid potassium hydroxide, 150kg of water, and 163kg of steam.

[0057] Put the material into the mixing tank, stir evenly, put it into the pressure kettle with a mortar pump, close the feeding port, feed steam, keep it at 0.6MPa for 4 hours, continue to feed steam at 1.2MPa and keep it for 9 hours, and release the pressure to 0.3MPa. Open the discharge port, use the residual pressure in the autoclave to pump the product into the intermediate tank to cool, when the material drops below 70°C, put the material into the separation tank, and use the suction filter to suck the liquid material into the storage tank. Received 629kg of liquid material, let it stand for 48h, and obtained 581kg of transparent liquid water glass, denoted as S 2 , cloudy water glass 48kg, denoted as yS 2 , Separated 23kg of unreacted matter. The modulus of water glass is 2.5 and the density is 1.49g / cm 3 . ...

Embodiment 3

[0059] Ratio of feeding: 130kg of quartz powder, 110kg of industrial solid sodium hydroxide, 80kg of industrial solid potassium hydroxide, 51kg of water, 155kg of steam, 68kg of suction filtration residue in example 1 and example 2.

[0060] Referring to the method of Example 1, put the mixed material into the autoclave, close the feeding port, feed steam to heat, keep the temperature at 0.8MPa for 1h, then feed steam and increase the pressure, keep the temperature at 1.8MPa for 4.5h, and release the pressure to 0.3 Under MPa, and refer to example 1 method operation, obtain liquid water glass 580kg, leave standstill 72h, obtain transparent liquid water glass 540kg, record as S 3 , cloudy water glass 40kg, denoted as yS 3 , Solid-liquid separation remaining material 14kg. The modulus of water glass is 2.5 and the density is 1.49g / cm 3 .

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Abstract

The invention relates to a preparation method of casting water glass; the preparation method is characterized in that: the material is heated to 158-169 DEG C, and the temperature is kept for 1-4 hours, and then the temperature is raised to 179-212 DEG C for 4-10 hours, and the pressure is released to 0.3MPa, and then the material is driven to a cooling tank by excess pressure, 50-70 DEG C is cooled, and non-reactive material is separated out and removed by solid-liquid separation equipment, and the non-reactive material can be used continuously in the follow-up production, supernatant liquidis sucked in a water glass raw material storage tank, plain sedimentation is carried out for 48-72 hours to obtain transparent liquid water glass, and a bottom port is used for draining turbid water glass; the mass percentage of SiO2, Na2O and K2O is adjusted by one or all of industrial solid sodium hydroxide and industrial solid potassium hydroxide, and 0.5-21 percent of modifiers is added by mass percentage, wherein the modifiers are one or a plurality of sorbitol, xylitol, mannite and maltitol; the raw material is added in a stirring tank to obtain the casting water glass including 23-31 percent of SiO2, 0.5-28 percent of K2O, 9-21 percent of Na2O, 0.5-21 percent of modifiers and remaining water by mass percentage.

Description

technical field [0001] The invention relates to molding materials for casting technology, and in particular provides a method for preparing water glass for casting. Background technique [0002] Water glass, commonly known as sodium silicate, is a system in which a true solution and a colloidal solution of a monovalent metal silicate coexist in water, and can generally be expressed as: M 2 O mSiO 2 ·nH 2 O, where M is Na + 、K + , Li + , Rb + . Foundry water glass is mainly Na + Water glass, or Na + 、K + A modified product of water glass mixed with the two, with a modulus of 1.7 to 2.6. CO in 1952 2 Sodium silicate water glass sand was introduced into the foundry industry and widely used. According to statistics at the end of 2007, my country's annual output of castings is 31.269 million tons, including 4.047 million tons of steel castings, and the annual consumption of ordinary sodium silicate glass is 300,000 to 400,000 tons, and the consumption is increasing at ...

Claims

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Application Information

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IPC IPC(8): B22C1/18C01B33/32
Inventor 余明伟
Owner SHENYANG HYATON FOUNDRY MATERIAL
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