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Method for preparing water glass using fly ash of common pulverized coal furnace

A technology of fly ash and water glass, applied in chemical instruments and methods, oxides of ferric iron, silicates, etc., can solve the problems of high energy consumption, high alkali consumption, low dissolution rate, etc., and achieve good results , Large processing capacity and high efficiency

Pending Publication Date: 2016-06-22
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 water glass using fly ash of common pulverized coal furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, the fly ash is subjected to 4 magnetic separations, and then mechanically pulverized, the mill rotating speed is 1200r / min, and the fine powder obtained after grinding for 4min is then mixed with 90% sulfuric acid in a solid-to-liquid ratio of 9: 4 Mix and react at 280°C for 5h; after the reaction is completed and cooled to room temperature, add water according to the solid-liquid ratio of fly ash and water as 1:3, heat to 90°C, stir for 2h, and filter to obtain a filter cake, which is then mixed with The solid-liquid ratio of fly ash and water is 1:1 for washing, and the solution of ferric sulfate and aluminum sulfate and high silicic acid leaching residue are obtained; the solid-liquid ratio of acid leaching residue and solution is 1:1, and the concentration is 10.5% After cooling to room temperature, filter and wash the solid residue with a small amount of water to obtain water glass.

Embodiment 2

[0030] Embodiment 2, the fly ash is subjected to 5 magnetic separations, and then mechanically pulverized, the mill rotating speed is 1100r / min, and the fine powder obtained after grinding 4min is then mixed with 98% sulfuric acid in a solid-to-liquid ratio of 9: 5 Mix, and react at 280 °C for 6 hours; after the reaction is completed and cooled to room temperature, add water according to the solid-liquid ratio of fly ash and water as 1:3, heat to 85 °C, stir for 2 hours, suction filter to obtain a filter cake, and use The solid-to-liquid ratio of fly ash and water is 3:2 for washing to obtain a solution of ferric sulfate and aluminum sulfate and high silicic acid leaching residue; the solid-liquid ratio of acid leaching residue and solution is 4:5 and the concentration is 10% The caustic soda solution was put into the autoclave and heated for 8 hours at a reaction temperature of 180 °C; after cooling to room temperature, the solid residue was filtered and washed with a small am...

Embodiment 3

[0031] Embodiment 3, the fly ash is subjected to 4 magnetic separations, then mechanically pulverized, and the mill rotating speed is 1000 r / min, and the fine powder obtained after grinding for 4 minutes is then mixed with 94% sulfuric acid in a solid-to-liquid ratio of 3: 1 Mix and react at 300°C for 6h; after the reaction is completed and cooled to room temperature, add water according to the solid-liquid ratio of fly ash and water as 1:4, heat to 80°C, stir for 2h, suction filter to obtain a filter cake, and use The solid-liquid ratio of fly ash and water is 3:2 for washing, and the solution of ferric sulfate and aluminum sulfate and high silicic acid leaching residue are obtained; the solid-liquid ratio of acid leaching residue and solution is 2:3, and the concentration is 11%. The caustic soda solution was put into an autoclave and heated for 8 hours at a reaction temperature of 200°C; after cooling to room temperature, the solid residue was filtered and washed with a smal...

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Abstract

The invention provides a method for preparing water glass using the fly ash of a common pulverized coal furnace. The method comprises the following steps: enabling sulfuric acid and fly ash to react in a low-temperature roasting condition to dissolve out Al2O3, Fe2O3 and FeO from the fly ash; and performing high-temperature hydrothermal extraction of SiO2 from acid leaching residue by using a caustic alkali solution to prepare water glass. The method provided by the invention imposes no special requirements on equipment, adopts low-temperature roasting and can make efficient use of SiO2 in the fly ash to prepare water glass; in the method provided by the invention, 90-96% of aluminum oxide and 98-100% of iron oxide in the fly ash can be dissolved out; and 80-87% of silicon dioxide in the acid leaching residue is converted into liquid-1 type water glass of which the modulus is greater than 3.4. In the technical scheme provided by the invention, the fly ash resource is fully utilized, the preparation technology is simple, the production cost is low, and the method 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 pulverized coal furnace fly ash. Background technique [0002] Coal-fired power generation is one of the power production methods commonly used in countries around the world, and the effective utilization of a large amount of fly ash produced by coal-fired combustion 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. It is also a waste of resources. [0003] From another point of view, fly ash is rich in various oxides, such as Al 2 O 3 , SiO 2 , Fe 2 O 3 , FeO, CaO, MgO, SO 3 , Na 2 O, K 2 O, etc., and also contains a small amount of rare earth elements. Separating and extracting these oxides from fly ash and preparing corresponding high value-added products can not o...

Claims

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Application Information

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IPC IPC(8): C01B33/32C01F7/74C01G49/14C01G49/08
CPCC01B33/32C01F7/743C01G49/08C01G49/14C01P2004/61
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP
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