Method for preparing special water glass for petrochemical catalysts by wet method

Abstract

The invention discloses a wet production method of high-modulus sodium silicate, particularly a production method of special water glass for a petrochemical catalyst, and solves the problems that high-modulus sodium silicate cannot be produced by a wet method and a high-modulus sodium silicate solution is difficult to filter. Compared with dry production methods, the wet production method saves 70 kg of standard coal and reduces 0.7-0.8 ton of emitted carbon dioxide during the production of each ton of high-modulus sodium silicate, and has obvious economic and social benefits.

Description

1. Technical field

[0001] The invention relates to a method for wet manufacturing special water glass for petrochemical catalysts, which can also be applied to the preparation of ordinary high modulus sodium silicate, and belongs to the improvement of the production method of inorganic silicon compound sodium silicate. 2. Background technology

[0002] Sodium silicate is also known as sodium silicate, and its production methods include dry method and wet method. The dry method is to use soda ash and quartz sand, or sodium sulfate, coal powder and quartz sand to react at a high temperature of 1350 ° C to 1450 ° C to produce sodium silicate The vitreous body is then hydrolyzed into solution under saturated vapor pressure. The high modulus sodium silicate solution has a high viscosity and is difficult to filter. It can only let the impurities settle naturally. It takes a long time for clarification to obtain qualified products. The dry process consumes a lot of energy and cause...

Examples

Embodiment 1

[0012] Embodiment 1, produce the special water glass 3.3M of petrochemical catalyst, Be ' 32 °.

[0013] 1. Use refined quartz sand and sodium hydroxide, Fe<0.02% as raw materials, produce 2.8M, Be'45° sodium silicate solution by wet method according to known technology, and filter it through a plate and frame filter press at 80-100°C for standby .

[0014] 2. Use 2.8M sodium silicate solution to prepare hydrated silicic acid A and prepare silica sol. Take 1.5 tons of hydrochloric acid in the silica sol reaction kettle and dilute to Be'8°. Under stirring, slowly add Be'10° silicic acid Sodium solution, control the pH below 3.5 to prevent the generation of jelly. B. Add an appropriate amount of water into the hydrated silicic acid precipitation kettle and heat it to 80-100°C. Add the silica sol solution and sodium silicate solution under stirring. Control PH < 7 and white hydrated silicic acid will be precipitated at this time. After the slurry is acidified and aged, polyethy...

Embodiment 2

[0017] Production of 3.3M, Be'38° sodium silicate solution

[0018] 1. Use refined quartz sand and sodium hydroxide, Fe<0.02% as raw materials, produce 2.6M by wet method according to known technology, Be'45° sodium silicate solution is filtered through filter press at 80-100°C to become clear and transparent Sodium silicate solution for use.

[0019] 2. Use 2.6M, Be'45° sodium silicate solution to prepare hydrated silicic acid A and silica sol, take 1.5 tons of hydrochloric acid in the silica sol reaction kettle and dilute to Be'18°, and slowly add Be'10 under stirring ° sodium silicate solution, control the pH below 3.5 to prevent the generation of jelly. B. Add an appropriate amount of water into the hydrated silicic acid precipitation kettle and heat it to 80-100°C. Add the silica sol solution and sodium silicate solution under stirring, and control the pH<7. At this time, white hydrated silicic acid will precipitate and the slurry will After acidification and aging, pol...

1. Technical field

[0001] The invention relates to a method for wet manufacturing special water glass for petrochemical catalysts, which can also be applied to the preparation of ordinary high modulus sodium silicate, and belongs to the improvement of the production method of inorganic silicon compound sodium silicate. 2. Background technology

[0002] Sodium silicate is also known as sodium silicate, and its production methods include dry method and wet method. The dry method is to use soda ash and quartz sand, or sodium sulfate, coal powder and quartz sand to react at a high temperature of 1350 ° C to 1450 ° C to produce sodium silicate The vitreous body is then hydrolyzed into solution under saturated vapor pressure. The high modulus sodium silicate solution has a high viscosity and is difficult to filter. It can only let the impurities settle naturally. It takes a long time for clarification to obtain qualified products. The dry process consumes a lot of energy and cause...

Examples

Embodiment 1

[0012] Embodiment 1, produce the special water glass 3.3M of petrochemical catalyst, Be ' 32 °.

[0013] 1. Use refined quartz sand and sodium hydroxide, Fe<0.02% as raw materials, produce 2.8M, Be'45° sodium silicate solution by wet method according to known technology, and filter it through a plate and frame filter press at 80-100°C for standby .

[0014] 2. Use 2.8M sodium silicate solution to prepare hydrated silicic acid A and prepare silica sol. Take 1.5 tons of hydrochloric acid in the silica sol reaction kettle and dilute to Be'8°. Under stirring, slowly add Be'10° silicic acid Sodium solution, control the pH below 3.5 to prevent the generation of jelly. B. Add an appropriate amount of water into the hydrated silicic acid precipitation kettle and heat it to 80-100°C. Add the silica sol solution and sodium silicate solution under stirring. Control PH < 7 and white hydrated silicic acid will be precipitated at this time. After the slurry is acidified and aged, polyethy...

Embodiment 2

[0017] Production of 3.3M, Be'38° sodium silicate solution

[0018] 1. Use refined quartz sand and sodium hydroxide, Fe<0.02% as raw materials, produce 2.6M by wet method according to known technology, Be'45° sodium silicate solution is filtered through filter press at 80-100°C to become clear and transparent Sodium silicate solution for use.

[0019] 2. Use 2.6M, Be'45° sodium silicate solution to prepare hydrated silicic acid A and silica sol, take 1.5 tons of hydrochloric acid in the silica sol reaction kettle and dilute to Be'18°, and slowly add Be'10 under stirring ° sodium silicate solution, control the pH below 3.5 to prevent the generation of jelly. B. Add an appropriate amount of water into the hydrated silicic acid precipitation kettle and heat it to 80-100°C. Add the silica sol solution and sodium silicate solution under stirring, and control the pH<7. At this time, white hydrated silicic acid will precipitate and the slurry will After acidification and aging, pol...