Method for producing aluminum oxide

A technology of alumina and aluminum salts, applied in the field of metallurgy, can solve problems that need to be improved, achieve good economic benefits, reduce energy consumption, and reduce costs

Active Publication Date: 2014-09-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the current technology for producing alumina from fly ash and bauxite still needs to be improved

Method used

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  • Method for producing aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: Recover alumina from high alumina fly ash

[0064] The composition of high-aluminum fly ash from a thermal power plant in Inner Mongolia is shown in Table 1.

[0065] Table 1 Chemical composition of high alumina fly ash samples

[0066] Element

[0067] Get 20 grams of the above-mentioned high-alumina fly ash whose particle size is below 200 orders, add 34.5 grams of ammonium sulfate, 26 grams of 98% sulfuric acid (equal moles of sulfuric acid and ammonium sulfate generate 60 grams of ammonium bisulfate), and the resulting mixture is heated to 180°C (the melting point of ammonium bisulfate is 147°C) and stir evenly, then place it in a muffle furnace and roast at 280°C for 6 hours. , heated to keep the temperature above 80°C, stirred and leached for 1h, then filtered while it was hot, collected the filtrate, cooled the obtained filtrate to room temperature and waited for the precipitation process of aluminum ammonium sulfate crystals to stop com...

Embodiment 2

[0068] Example 2: Recovery of alumina from high alumina fly ash

[0069] The source of high aluminum fly ash is the same as in Example 1. Take 40 grams of the above-mentioned high-alumina fly ash with a particle size below 200 mesh, add 320 grams of sodium bisulfate monohydrate, heat to 120°C (the melting point of sodium hydrogensulfate monohydrate is 58°C), stir evenly, and then place it in a muffle furnace Inside, bake at 320°C for 1 hour. After the roasting is completed, transfer the roasted clinker to a 1000mL beaker, add 800mL of boiling water, heat to keep the temperature above 80°C, stir and leach for 0.5h, then filter while it is hot, and collect the filtrate. Then, add ammonium sulfate 100 grams in the filtrate that obtains, after stirring and dissolving completely, solution is cooled to room temperature and after waiting for the precipitation process of aluminum ammonium sulfate crystal to stop completely, filter, the aluminum ammonium sulfate crystal that obtains i...

Embodiment 3

[0070] Example 3: Recovery of alumina from aluminum-containing fly ash

[0071] The composition of aluminum-containing fly ash from a thermal power plant in Taiyuan, Shanxi is shown in Table 2.

[0072] Table 2 Chemical composition of fly ash samples from a thermal power plant in Taiyuan

[0073] Element

[0074] Take 40 grams of the above-mentioned high-alumina fly ash with a particle size below 200 mesh, add 189.3 grams of sodium sulfate, 133.3 grams of 98% sulfuric acid, and 50 grams of water, heat to 120 ° C (the melting point of sodium bisulfate monohydrate is 58 ° C) and stir evenly , and then placed in a muffle furnace and fired at 320°C for 6 hours. After the roasting is completed, transfer the roasted clinker to a 1000mL beaker, add 800mL of boiling water, heat to keep a slight boil (temperature ~ 100°C), stir and leach for 2 hours, then filter while it is hot, collect the filtrate, and then add sulfuric acid to the obtained filtrate 100 grams of ammonium...

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Abstract

The invention provides a method for producing aluminum oxide. The method comprises the following steps: mixing an aluminum-bearing mineral raw material with a roasting additive for roasting so as to obtain a roasted clinker, wherein the roasting additive is acid sulfate or a mixture of sulfate and sulfuric acid, and the molar ratio of sulfate and sulfuric acid is 1:1; immersing the roasted clinker by water to obtain leacheate; carrying out solid-liquid separation on the leacheate to obtain an infusion solution and filter residues; concentrating the infusion solution and standing for crystallization so as to obtain an aluminum salt coarse product; dissolving the aluminum salt coarse product in water and adjusting the pH value of the obtained solution to 8.5 by using ammonium water, and then filtering to obtain aluminum oxide. Aluminum oxide can be quickly and effectively produced by virtue of the method, and the method is relatively low in roasting temperature and energy-saving and has no special requirements for the content of aluminum oxide in the mineral raw material. The obtained product is high in purity and has few tailings, so that secondary pollution can be effectively avoided.

Description

technical field [0001] The invention relates to the field of metallurgy, and in particular, to a method for producing alumina. Background technique [0002] Coal resources in central and western Inner Mongolia and northern Shanxi are rich in aluminum-containing minerals (mainly boehmite), and the alumina content of fly ash produced after combustion for power generation is as high as 40-50%, which is a very Precious potential aluminum-containing resources with high economic development value, especially in the situation of increasingly scarce bauxite resources in our country, even have great significance as an alternative resource for bauxite to produce alumina to ensure the safety of the aluminum industry. However, the development and utilization of high-aluminum fly ash aluminum resources in Inner Mongolia and Shanxi is very limited. Up to now, the historical stockpile has exceeded 200 million tons, making it the largest industrial waste in the area. Few of them are stored...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/26
Inventor 王毅文洪涛雷雪飞刘灵欧孙应龙袁超李磊
Owner TSINGHUA UNIV
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