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A method for extracting silicon and aluminum composite refractories from fly ash

A technology of refractory materials and fly ash, which is applied in the field of extracting silicon and aluminum composite refractory materials, can solve the problems of waste of resources, endangering biological and human health, and non-utilization of useful components, so as to improve compatibility and stability The effect of sex and fire resistance

Active Publication Date: 2017-09-19
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash stockpiling not only occupies a large amount of land, pollutes the environment, but also endangers biological and human health, and many useful components in fly ash cannot be rationally utilized, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for extracting silicon and aluminum composite refractories from fly ash, characterized in that it comprises the following steps:

[0031] (1) Grinding the fly ash to a fineness of 300 mesh, adding an activator and water, and ultrasonically treating it for 4 minutes at a frequency of 90 kHz;

[0032] (2) heating the above-mentioned ultrasonically treated material to dryness at 700° C., sending it into a muffle furnace, and roasting at 1000° C. for 31 minutes;

[0033] (3) Cool the above-mentioned calcined material to normal temperature, add 9 mol / l sodium hydroxide, keep the temperature at 80° C. for 1 hour, and filter to obtain silicon-containing filtrate and filter residue;

[0034] (4) adding the filter residue to a hydrochloric acid solution whose weight is 1.8-2 times, the concentration of hydrochloric acid is 33%, heat preservation and reaction at 120° C. for 1 hour, and filter to obtain secondary filtrate and secondary filter residue;

[0035](5) adjust ...

Embodiment 2

[0044] A method for extracting silicon and aluminum composite refractories from fly ash, comprising the following steps:

[0045] (1) Grinding the fly ash to a fineness of 200 mesh, adding an activator and water, and ultrasonically treating it for 5 minutes at a frequency of 100 kHz;

[0046] (2) heating the above-mentioned ultrasonically treated material to dryness at 700° C., sending it into a muffle furnace, and roasting at 1000° C. for 37 minutes;

[0047] (3) Cool the above-mentioned calcined material to normal temperature, add 10mol / l sodium hydroxide, heat-preserve and react at 80°C for 1 hour, and filter to obtain silicon-containing filtrate and filter residue;

[0048] (4) adding the filter residue to a hydrochloric acid solution whose weight is 1.8 times, the concentration of hydrochloric acid is 40%, heat preservation reaction at 120° C. for 1 hour, and filter to obtain secondary filtrate and secondary filter residue;

[0049] (5) Adjust the pH value of the seconda...

Embodiment 3

[0058] A method for extracting silicon and aluminum composite refractories from fly ash, characterized in that it comprises the following steps:

[0059] (1) Grinding the fly ash to a fineness of 300 mesh, adding an activator and water, and ultrasonically treating it for 4 minutes at a frequency of 100 kHz;

[0060] (2) heating the above-mentioned ultrasonically treated material to dryness at 700° C., sending it into a muffle furnace, and roasting at 1000° C. for 40 minutes;

[0061] (3) Cool the above-mentioned calcined material to normal temperature, add 10mol / l sodium hydroxide, heat-preserve and react at 80°C for 1 hour, and filter to obtain silicon-containing filtrate and filter residue;

[0062] (4) adding the filter residue to a hydrochloric acid solution whose weight is 1.8 times, the concentration of hydrochloric acid is 40%, heat preservation reaction at 120° C. for 1 hour, and filter to obtain secondary filtrate and secondary filter residue;

[0063] (5) Adjust the...

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PUM

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Abstract

The invention discloses a method for extracting silicon and aluminum composite refractories from fly ash. Most of the traditional fly ash activation uses the method of mixed roasting, which consumes a lot of energy. In the present invention, the fly ash and activator , water mixing, through ultrasonic treatment, the activation effect can be achieved in a short time and at a lower temperature, which can effectively improve the extraction rate of silicon and aluminum. The additives added can not only effectively improve the compatibility between materials, It can also improve the stability and fire resistance of finished products, and can be used in various fields of the national economy such as steel, non-ferrous metals, glass, cement, ceramics, petrochemicals, machinery, boilers, light industry, electric power, military industry, etc. It is non-toxic, non-polluting, Safety and environmental protection.

Description

technical field [0001] The invention mainly relates to the field of extracting aluminum, in particular to a method for extracting silicon and aluminum composite refractories from fly ash. Background technique [0002] Fly ash is a solid waste from coal-fired power plants. At present, the total storage of fly ash in my country has exceeded 1 billion tons, and now it is increasing at a rate of 80 million tons per year, while the utilization of fly ash is less than 50%. The stockpiling of fly ash not only occupies a large amount of land, pollutes the environment, but also endangers organisms and human health. Moreover, many useful components in fly ash cannot be rationally utilized, resulting in waste of resources. [0003] The addition of fly ash in concrete saves a lot of cement and fine aggregate; reduces water consumption; improves the workability of concrete mixture; enhances the pumpability of concrete; reduces the creep of concrete; reduces hydration Heat and thermal e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 孙玉壮张海岛王金喜赵珊珊石志祥孟志强
Owner HEBEI UNIV OF ENG
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