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Method for preparing potash water glass

A technology of potassium silicate and potassium hydroxide, which is applied in the direction of alkali metal silicate and silicate, can solve the problems of high reaction temperature, high energy consumption, and complicated process, and achieve low cost, low energy consumption, The effect of simple process

Active Publication Date: 2013-04-10
KUNMING DAOERSEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the traditional method of producing potassium silicate has a complicated process, the reaction temperature is as high as 1200-1400°C, and the reaction pressure is 0.4-0.5MPa, which requires high equipment materials and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 280g of 20% potassium hydroxide solution into the reactor, heat and stir it. When the temperature of the potassium hydroxide lye rises to about 70°C, 150g of wet silica gel with a pH value of 3.5 and a water content of 50% are added in a balanced manner. Keep the reaction temperature at 85°C, the reaction time for 1.5h, and the stirring speed at 350rpm, and replenish water properly during the period to avoid the reaction liquid being viscous and affecting the reaction. After the reaction is completed, filter under reduced pressure, and the filtrate is evaporated and concentrated in a vacuum using a water ring vacuum pump. The vacuum degree is controlled at 0.03-0.06MPa, and the specific gravity of the concentrated solution is controlled at 1.37-1.45g / cm 3 , the concentrated solution was cooled to room temperature to obtain 240g potassium water glass. Its appearance is colorless and transparent, and its density is 1.425g / cm 3 , K 2 O content 16.7%, SiO 2 The cont...

Embodiment 2

[0032] 224g of 25% potassium hydroxide solution was added to the reactor, heated and stirred. When the temperature of the lye rises to about 75°C, 187.5g of wet silica gel with a pH value of 3.5 and a water content of 60% are added in a balanced manner. Keep the reaction temperature at 80°C, the reaction time for 2 hours, and the stirring speed at 350rpm, and replenish water properly during the period to avoid the reaction liquid being viscous and affecting the reaction. After the reaction is completed, filter under reduced pressure, and the filtrate is evaporated and concentrated in a vacuum using a water ring vacuum pump. The vacuum degree is controlled at 0.03-0.06MPa, and the specific gravity of the concentrated solution is controlled at 1.37-1.45g / cm 3 , the concentrated solution was cooled to room temperature to obtain 215g potassium water glass. Its appearance is colorless and transparent, and its density is 1.438g / cm 3 , K 2 O content 16.5%, SiO 2 The content is 36...

Embodiment 3

[0034] Add 280g of 20% potassium hydroxide solution into the reactor, heat and stir it. When the temperature of the lye rises to about 70°C, 210g of wet silica gel with a pH value of 4.0 and a water content of 50% are added in a balanced manner. Keep the reaction temperature at 90°C, the reaction time for 1.0h, and the stirring speed at 400rpm, and replenish water properly during the period to avoid the reaction liquid being viscous and affecting the reaction. After the reaction is completed, filter under reduced pressure, and the filtrate is vacuum evaporated and concentrated with a water ring vacuum pump. The vacuum degree is controlled at 0.03-0.06MPa, and the specific gravity of the concentrated solution is controlled at 1.37-1.45g / cm 3 , the concentrated solution was cooled to room temperature to obtain 290g potassium water glass. Its appearance is colorless and transparent, and its density is 1.382g / cm 3 , K 2 O content 12.7%, SiO 2 The content is 39.7%, and the modu...

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Abstract

The invention provides a method for preparing potash water glass. A silica gel byproduct in a phosphatic fertilizer plant is used as one production raw material. In the preparing process, certain quantity of industrial potassium hydroxide solution and wet silica gel are added to a reactor and react at the temperature kept between 80 DEG C and 100 DEG C. After the silica gel is fully dissolved, reacting liquid is in a semitransparent state and is then filtered. A concentration period begins. When the reacting liquid reaches the specified density, concentration stops, and the potash water glass is obtained after the reacting liquid is cooled to the room temperature. Compared with the traditional method that a potash water glass solid is firstly obtained and then reacts to form the liquid at the low temperature, the method for preparing potash water can directly prepare the liquid potash water glass without high temperature and pressurization, thereby being simpler than the traditional method.

Description

technical field [0001] The invention belongs to the technical field of potassium silicate production in the inorganic chemical industry, and relates to a method for preparing potassium silicate. Background technique [0002] Potassium silicate is mainly used in TV fluorescent powder and welding rod binder, and can also be used in high temperature paint binder, detergent, vat dye, fire retardant, preservative, color vehicle, wall paint and advanced ceramic paint, etc. [0003] Silica gel is a by-product of phosphate fertilizer plants. At present, all large and medium-sized phosphate fertilizer enterprises in the country have recycled fluosilicic acid, but silica gel has basically not been used rationally. Because it contains fluorine, it seriously pollutes the environment, and has long been regarded as "waste" by people, which is difficult to handle and cannot be piled up. [0004] The traditional methods of producing potassium silicate are divided into dry method and wet me...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 裴文俊
Owner KUNMING DAOERSEN TECH
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