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Method for preparing sodium silicate by using common pulverized fuel ash from circulating fluidized bed

A common circulation and fly ash technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of high energy consumption, high alkali consumption, low dissolution rate, etc., and achieve simple manufacturing process and large processing capacity , good effect

Pending Publication Date: 2016-06-01
ZHUO DA NEW MATERIAL TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry production is to mix quartz sand and soda ash in a certain proportion and heat them in a reverberatory furnace to about 1400°C to generate molten sodium silicate. It is characterized in that water glass can be prepared according to different modulus requirements, but consumes more energy. Large; wet production is to heat caustic soda aqueous solution and quartz powder in an autoclave to directly generate water glass, which is filtered and concentrated to obtain finished water glass. Although its energy consumption is lower than that of the dry process, the crystal state SiO in the quartz powder 2 Low dissolution rate and high alkali consumption

Method used

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  • Method for preparing sodium silicate by using common pulverized fuel ash from circulating fluidized bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, fly ash is through 4 times of magnetic separation, then through mechanical grinding, mill speed is 1200r / min, the fine powder powder that obtains after pulverization 4min, then with 82% sulfuric acid by solid-to-liquid ratio 5: 4 Mix and react at 200°C for 4 hours; after the reaction is completed and cooled to room temperature, add water according to the solid-to-liquid ratio of fly ash to water at 1:3, heat to 90°C, stir for 2 hours, filter cake with suction, and use The solid-to-liquid ratio of fly ash and water is 1:1 for washing to obtain the solution of ferric sulfate and aluminum sulfate and high silica acid leaching residue; the concentration of acid leaching residue to solution is 1:1 and the concentration is 10.5%. The caustic soda solution is put into a high-pressure reactor and heated for 10 hours at a reaction temperature of 180°C; after cooling to room temperature, filter and wash the solid slag with a small amount of water to obtain water glas...

Embodiment 2

[0031] Embodiment 2, the fly ash is through 5 times of magnetic separation, then through mechanical grinding, the mill speed is 1100r / min, the fine powder powder obtained after grinding for 4min, then with 85% sulfuric acid by solid-liquid ratio 6: 5 mixed and reacted at 200°C for 5 hours; after the reaction was completed and cooled to room temperature, add water according to the solid-to-liquid ratio of fly ash and water at 1:3, heat to 85°C, stir for 2 hours, filter cake with suction, and use The solid-to-liquid ratio of fly ash and water is 3:2 for washing to obtain the solution of ferric sulfate and aluminum sulfate and high-silicate leaching residue; the solid-liquid ratio of acid leaching residue to solution is 4:5, and the concentration is 10%. The caustic soda solution is put into a high-pressure reactor and heated for 8 hours at a reaction temperature of 180°C; after cooling to room temperature, filter and wash the solid slag with a small amount of water to obtain wate...

Embodiment 3

[0032] Embodiment 3, fly ash is through 4 times of magnetic separation, then through mechanical grinding, mill speed is 1000r / min, the fine powder powder that obtains after pulverization 4min, then with 85% sulfuric acid by solid-liquid ratio 6: 5 mixed and reacted at 200°C for 5 hours; after the reaction was completed and cooled to room temperature, add water according to the solid-to-liquid ratio of fly ash and water at 1:4, heat to 80°C, stir for 2 hours, filter cake with suction, and use The solid-to-liquid ratio of fly ash and water is 3:2 for washing to obtain the solution of ferric sulfate and aluminum sulfate and high silica acid leaching residue; the solid-liquid ratio of acid leaching residue to solution is 2:3 and the concentration is 11%. The caustic soda solution was put into a high-pressure reactor and heated for 8 hours at a reaction temperature of 200°C; after cooling to room temperature, it was filtered and the solid slag was washed with a small amount of water...

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Abstract

The invention provides a method for preparing sodium silicate by using common pulverized fuel ash from a circulating fluidized bed, comprising: reacting sulfuric acid with pulverized fuel ash under low-temperature roasting conditions, dissolving out Al2O3, Fe2O3 and F3O in the pulverized fuel ash, and using a caustic solution to hydrothermally extract at high temperature SiO2 in acid leaching residue. The method provided by the invention has no special requirement on equipment, capable of roasting at low temperature and efficient in utilizing SiO2 in pulverized fuel ash to prepare sodium silicate; the method provided by the invention can dissolve out 90-96% of aluminum oxide in pulverized fuel ash and 98-100% of iron oxide in the pulverized fuel ash; 80-87% of silicon dioxide in the acid leaching residue is converted into liquid -1-type sodium silicate greater than 3.4 in modulus. The technical scheme provided by the invention makes full use of pulverized fuel ash resources, and the manufacture process is simple and low in production cost and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing water glass, in particular to a method for preparing water glass by using common circulating fluidized bed fly ash. Background technique [0002] Coal-fired power generation is one of the power production methods commonly used in countries all over the world, and the effective utilization of a large amount of fly ash produced by coal-fired coal has become a worldwide issue. At present, more than 70% of my country's electricity is generated by coal-fired power generation, and about 30% of the country's coal output is used for power generation. If the resulting fly ash is not utilized enough, it will not only occupy a large amount of land, but also cause serious environmental pollution. It is also a waste of resources. [0003] Due to the low-temperature cycle sintering characteristics of fluidized bed fly ash, circulating fluidized bed ash cannot form a glass phase, resulting in relatively low activity. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32B03C1/02
CPCC01B33/32B03C1/02
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP
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