Method for preparing aluminum-magnesium silicate from fly ash

A magnesium-aluminum silicate and fly ash technology, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of limited source of raw materials, and the output and cost of magnesium-aluminum sulfate products cannot meet the demand.

Active Publication Date: 2016-11-23
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the limited source of raw materials in the existing method for preparing magnesium aluminum silicate, resulting in the d

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  • Method for preparing aluminum-magnesium silicate from fly ash

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Embodiment 1

[0034] (1) 600ml concentration is in the sodium hydroxide of 20% by weight, joins in the fly ash of 200g main components as shown in Table 1 (the weight ratio of fly ash and described alkaline solution is 1:4.2), Stir evenly, place in a mechanically stirred reactor, screw on the seal cover of the reactor and turn on the heating and stirring button (stirring rate is 150rpm). The temperature was set at 110° C., and the reaction time was 1 hour. After the reaction is over, cooling water is introduced at the same time to rapidly cool down the kettle body. When the temperature in the kettle was lowered to room temperature, the lid of the kettle was unscrewed, and the reaction slurry was poured out. After vacuum filtration, the pre-desilication solution (the composition is shown in Table 2 below) and the silicon extraction residue were obtained;

[0035] (2) The silicon extraction residue obtained in step (1) is mixed with calcium oxide and sodium carbonate, and the ratio is: rela...

Embodiment 2

[0045] (1) 680ml concentration is in the sodium hydroxide of 15% by weight, joins in the fly ash of 200g main components as shown in Table 1 (the weight ratio of fly ash and described alkaline solution is 1:5.5), Stir evenly, place in a mechanically stirred reactor, screw on the seal cover of the reactor and turn on the heating and stirring button (stirring rate is 150rpm). The temperature was set at 95°C and the reaction time was 30 minutes. After the reaction is over, cooling water is introduced at the same time to rapidly cool down the kettle body. When the temperature in the kettle was lowered to room temperature, the lid of the kettle was unscrewed, and the reaction slurry was poured out. After vacuum filtration, the pre-desiliconization solution (the composition is shown in Table 2 below) and the silicon extraction residue were obtained. The silicon extraction residue was washed 4 times with hot water, and dried in an electric blast drying oven at 120 for 8 hours;

[0...

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Abstract

The invention discloses a method for preparing aluminum-magnesium silicate from fly ash. Fly ash which is huge in emission amount and pollutes the environment after being emitted is fully used as the raw material, the defect that the yield and cost of an existing aluminum-magnesium silicate preparation method is limited by distribution and reserves of natural aluminum-magnesium silicate ore is overcome, circular economy and saving economy can be developed, and damage of fly ash emission to the natural ecological environment can be reduced. Besides, the performance of an aluminum-magnesium silicate product prepared through the method meets the industrial standard, and purity, whiteness and the like of the product are even better than industrial product indexes.

Description

technical field [0001] The invention relates to a method for preparing magnesium aluminum silicate, in particular to a method for preparing magnesium aluminum silicate by using fly ash as a raw material. Background technique [0002] Magnesium aluminum silicate is a white, non-toxic composite colloidal substance with high dispersibility and rheological properties in aqueous solution. Its chemical composition is often expressed in the form of oxides, mainly silica, alumina And magnesium oxide, widely used in construction, coatings, daily chemicals, as well as medicine and food industries. [0003] For example, the synthesized composite magnesium aluminum silicate thermal insulation material can be used in electric power, metallurgy, chemical industry and other industries. They are excellent powder suspending agents and high-efficiency stabilizers for emulsions in paints and emulsified paints, which can increase the anti-sedimentation thixotropy and suspension stabilization e...

Claims

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Application Information

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IPC IPC(8): C01B33/20
Inventor 王晓欢孙琦王宝冬肖永丰禹耕之刘晓婷赵利军
Owner CHNA ENERGY INVESTMENT CORP LTD
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