Method of extracting silica gel from high-alumina fly ash

A high-alumina fly ash and silica gel technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of reducing reaction rate, difficult control, and restricting application, so as to reduce environmental pollution, scientific and reasonable process design, and high reaction rate fast effect

Active Publication Date: 2014-09-10
DATANG INT HIGH ALUMINA COAL R & D CENT
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Problems solved by technology

However, this method needs to control various reaction conditions from coal combustion, and its control is difficult and demanding, which restricts its application in large-scale production; patent CN101254933B "extracting high-purity alumina and silica gel from fly ash method", which discloses the use of sodium carbonate and activated fly ash for batch calcining, and the clinker obtained by calcining is subjected to carbon separation, and finally alumina and silica gel are obtained.
Since the carbonic acid formed by dissolving the carbon dioxide used in the carbonization process is a weak acid, it takes a long time to feed the carbon dioxide, thus reducing the reaction rate of the whole system

Method used

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Embodiment 1

[0023] This embodiment provides a method for extracting silica gel from high-alumina fly ash, the method comprising the following steps:

[0024] 1) High alumina fly ash (among them, SiO 2 and Al 2 o 3 The mass percentages are 41% and 45%, respectively) and the aqueous solution containing sodium sulfate and aluminum sulfate (wherein, the content of sodium sulfate is 150g / L, and the content of aluminum sulfate is 250g / L) according to the solid-liquid ratio of 1:4 Mixing and preparing to make raw slurry;

[0025] 2) Sinter the raw slurry obtained above at a temperature of 1000°C for 2.5 hours to make clinker; at the same time, it is accompanied by SO 3 generation, the SO produced by this step 3 It can be sent to the next step after being absorbed by sulfuric acid with a mass fraction of 10-40%, which is used for the acid dissolution of clinker;

[0026] 3) The sulfuric acid with a mass fraction of 5% and the clinker obtained above were reacted at 60° C. for 30 min at a mass...

Embodiment 2

[0029] This embodiment provides a method for extracting silica gel from high-alumina fly ash, the method comprising the following steps:

[0030] 1) High alumina fly ash (among them, SiO 2 and Al 2 o 3 The mass percentages are 43% and 50%, respectively) and the aqueous solution containing sodium sulfate and aluminum sulfate (wherein, the content of sodium sulfate is 200g / L, and the content of aluminum sulfate is 300g / L) according to the solid-liquid ratio of 1:3.5 Mixing and preparing to make raw slurry;

[0031] 2) Sinter the raw slurry obtained above at a temperature of 1200°C for 1.5 hours to make clinker; at the same time, it is accompanied by SO 3 generation, the SO produced by this step 3 It can be sent to the next step after being absorbed by sulfuric acid with a mass fraction of 10-40%, which is used for the acid dissolution of clinker;

[0032] 3) The sulfuric acid with a mass fraction of 10% and the clinker obtained above were reacted at 80° C. for 20 minutes at...

Embodiment 3

[0035] This embodiment provides a method for extracting silica gel from high-alumina fly ash, the method comprising the following steps:

[0036] 1) High alumina fly ash (among them, SiO 2 and Al 2 o 3 The mass percentages are 41% and 51%, respectively) and the aqueous solution containing sodium sulfate and aluminum sulfate (wherein, the content of sodium sulfate is 260g / L, and the content of aluminum sulfate is 450g / L) according to the solid-liquid ratio of 1:3 Mixing and preparing to make raw slurry;

[0037] 2) Sinter the raw slurry obtained above at a temperature of 1300°C for 0.5h to make clinker; at the same time, it is accompanied by SO 3 generation, the SO produced by this step 3 It can be sent to the next step after being absorbed by sulfuric acid with a mass fraction of 10-40%, which is used for the acid dissolution of clinker;

[0038] 3) React 10 min of sulfuric acid with a mass fraction of 15% and the clinker obtained above at 95°C in a mass ratio of 5:1, fil...

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PUM

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Abstract

The invention provides a method of extracting silica gel from high-alumina fly ash. The method comprises the following steps: 1) mixing the high-alumina fly ash with an aqueous solution containing sodium sulfate and aluminum sulfate to prepare raw material slurry; 2) calcining the raw material slurry to prepare a clinker; 3) carrying out acid dissolution on the clinker, filtering and washing the dissolved product and collecting a dissolving liquid; and 4) heating and filtering the dissolving liquid to obtain a filter cake, and drying the filter cake to obtain the silica gel. The method provided by the invention provides a method for extracting silica gel from high-alumina fly ash, which is easy to operate, fast in reaction speed and excellent in quality.

Description

technical field [0001] The invention relates to a method for extracting silica gel from high-alumina fly ash, which belongs to the technical field of comprehensive utilization of high-alumina fly ash. Background technique [0002] With the rapid development of thermal power generation in my country, the discharge and stacking of high-aluminum fly ash are also increasing, which not only causes pollution in transportation and storage, but also occupies a large amount of land resources. Therefore, it is imminent to seek an effective way to comprehensively utilize high-alumina fly ash. In recent years, a number of scientific research institutes and enterprises have conducted a lot of research and industrialization exploration on the extraction of alumina and silica gel from high-alumina fly ash. Patent CN101792161A "A method for extracting high-purity alumina and silica gel from fly ash in coal-fired power plants", which discloses coal pretreatment and furnace combustion, direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14
Inventor 许学斌张战军杨会宾公彦兵杜燕
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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