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Method for activating and decomposing silicon-aluminum material

A material, silicon-aluminum technology, which is applied in the field of activation and decomposition of silicon-aluminum materials, can solve the problems of high equipment requirements for acid-dissolving method, danger of ammonia gas, and dangerous production operation, etc., to achieve strong activity, prevent particle agglomeration, and reduce production. cost effect

Active Publication Date: 2014-06-25
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] CN102515221A Wei Cundi et al. disclosed a "Method for Extracting Aluminum Oxide and Amorphous SiO2 from Fly Ash or Coal Gangue". The simple pyrosulfate method for activating and decomposing fly ash is relatively simple, which alleviates equipment corrosion However, the common feature of the salt method is that the amount of salt used is large and the cost is high
[0020] The above-mentioned methods of extracting alumina from fly ash have their own advantages and disadvantages. The acid-dissolving method requires high equipment, high risk of production operations, and complicated processes. The salt method (ammonium sulfate, pyrosulfate) uses a large amount of salt and is expensive; The salt method is not only costly, but also a large amount of ammonia gas is prone to danger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a. Take 10g of pure mullite powder and mix and grind with 1g of sodium bisulfate, and grind to 200 mesh;

[0037] b. Add 10ml of concentrated sulfuric acid to activate it, and keep it warm at 180°C for 8 hours;

[0038] c. Put the activated mullite powder into a quartz crucible, heat it from room temperature to 200°C in a high-temperature furnace, keep it warm for 3 hours, and take it out after cooling to below 100°C;

[0039] d. Add 100ml of water to the mullite powder after low-temperature roasting to soak the reaction product, stir at 70°C, and keep warm for 8 hours;

[0040]e. Solid-liquid separation, the solid is amorphous silica, the liquid is soluble aluminum sulfate solution, adjust the pH=1.5, stir at 90°C and then stand still for 8 hours to form jarosite precipitation to remove iron and carry out solid-liquid separation , to obtain the sulfate solution after iron removal, concentrate and crystallize at 95°C until the liquid nearly disappears, and obtain mixed...

Embodiment 2

[0046] a. Take 10g of circulating fluidized bed fly ash and 1g of acid sulfate, mix and grind, and grind to 200 mesh;

[0047] b. Add 10ml of concentrated sulfuric acid to activate it, and keep it warm at 200°C for 6 hours;

[0048] c. Put the activated circulating fluidized bed fly ash into a quartz crucible, heat it from room temperature to 240°C in a high-temperature furnace, keep it warm for 3 hours, and take it out after cooling to below 100°C;

[0049] d. Add 100ml of water to the circulating fluidized bed fly ash after low-temperature roasting to soak the reaction product, stir at 80°C, and keep it warm for 6 hours;

[0050] e. Solid-liquid separation, the solid is amorphous silica, the liquid is soluble aluminum sulfate solution, adjust pH=2.5, stir at 90°C and then stand still for 8 hours to form jarosite precipitation to remove iron and perform solid-liquid separation , to obtain the sulfate solution after iron removal, concentrate and crystallize at 98°C until the ...

Embodiment 3

[0056] a. Take 10g of coal gangue and 0.8g of acid sulfate, mix and grind, and grind to 200 mesh;

[0057] b. Add 10ml of concentrated sulfuric acid to activate it, and keep it warm at 250°C for 4 hours;

[0058] c. Put the activated gangue into a quartz crucible, heat it from room temperature to 280°C in a high-temperature furnace, keep it warm for 3 hours, and take it out after cooling to below 100°C;

[0059] d. Add 100ml of water to the gangue roasted at low temperature to soak the reaction product, stir at 95°C, and keep warm for 4 hours;

[0060] e. Solid-liquid separation, the solid is amorphous silica, the liquid is soluble aluminum sulfate solution, adjust pH=2.5, stir at 95°C and then stand still for 6 hours to form jarosite precipitation to remove iron and carry out solid-liquid separation , to obtain the sulfate solution after iron removal, concentrate and crystallize at 96°C until the liquid nearly disappears, and obtain mixed crystals of aluminum sulfate and a s...

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PUM

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Abstract

The invention relates to a method for activating and decomposing a silicon-aluminum material. The method comprises the following steps of adding sulfate to the silicon-aluminum material for mixed grinding; then adding concentrated sulfuric acid for activation, calcination and aqueous fusion; carrying out solid-liquid separation, and the like to finally obtain alpha-Al2O3. According to the method, the silicon-aluminum material is subjected to the mixed grinding with a small amount of salt, so that reacted active materials are uniformly distributed on the surface of the powder granule of the silicon-aluminum material, and the granule aggregation is prevented by sufficiently utilizing powder surface effect; acid and the salt are mixed to generate a part of pyrosulfuric ions, so that the activity of a sulfuric acid reactant is higher, the reaction initial temperature is reduced, and the reaction efficiency is greatly increased.

Description

Technical field: [0001] The invention relates to a method for activating and decomposing silicon-aluminum materials, which is a method for obtaining aluminum sulfate salt and amorphous silicon dioxide after mixing and grinding silicon-aluminum materials and sulfate, activating and roasting them with concentrated sulfuric acid. technical background: [0002] There are many high-alumina-silicon components in nature and solid waste, such as coal gangue and fly ash, and high-alumina-silicon minerals such as mullite, among which Al 2 o 3 The content of SiO2 and SiO2 is more than 30-40%, which can be used as raw material for alumina extraction. At present, the process of extracting alumina from bauxite at home and abroad is relatively mature, mainly the Bayer process. The research on extracting alumina from other high-alumina materials mainly focuses on fly ash. The methods involved include alkali method, soda lime sintering method, acid method, etc., and only the alkali method ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01F7/76
Inventor 杨殿范魏存弟蒋引珊
Owner CHINA SHENHUA ENERGY CO LTD
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