Method of preparing aluminum oxide from fly ash

A fly ash and alumina technology, which is applied in the preparation of alumina/aluminum hydroxide and alumina/hydroxide, can solve problems such as complex process, achieve simple process, high added value of products, and simplify production The effect of the process

Active Publication Date: 2007-03-07
PINGSHUO INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the method uses H 2 SO 4 The solution leaching method extracts alumina from fly ash. It is necessary to separate the residual acid from the ash residue containing aluminum sulfate after the reaction. The aluminum sulfate in the filter residue also needs to be boiled in hot water to be dissolved. The process is relatively complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1 ton of fly ash containing 40% alumina, grind it into -100 mesh fine powder, remove iron by magnetic separation, and roast at 400°C for 1.5h to obtain activated fly ash.

[0026] Combine activated fly ash with 98% concentrated H 2 SO 4 1.1t, mix evenly, put it on the carrier plate in the tunnel kiln, raise the temperature to 220°C and roast for 30 minutes, and burn it to dry slag before it comes out of the furnace.

[0027] Use 5 tons of hot water at 80°C to soak the roasted dry residue, dissolve the aluminum sulfate therein, and filter to obtain an aluminum sulfate solution.

[0028] The filtrate was evaporated and concentrated, and the evaporated water vapor was condensed and then returned to the leaching process. After the concentrated solution was cooled, aluminum sulfate crystals were precipitated, filtered, and 2400Kg of solid crystals were collected. The filtrate was added to the aluminum sulfate solution obtained by the next filtration, and evaporated a...

Embodiment 2

[0033] Take 1 ton of fly ash containing 40% alumina, grind it into -100 mesh fine powder, remove iron by magnetic separation, and roast at 600°C for 1 hour to obtain activated fly ash.

[0034] Combine activated fly ash with 85% concentrated H 2 SO 42t, mix evenly, put it on the carrier plate in the tunnel kiln, raise the temperature to 200°C and roast for 30 minutes, and burn it to dry slag before it comes out of the furnace.

[0035] Use 3 tons of hot water at 90°C to soak the roasted dry residue, dissolve the aluminum sulfate therein, and filter to obtain an aluminum sulfate solution.

[0036] The filtrate was evaporated and concentrated, and the evaporated water vapor was condensed and then returned to the leaching process. After the concentrated solution was cooled, aluminum sulfate crystals were precipitated, filtered, and 2400Kg of solid crystals were collected. The filtrate was added to the aluminum sulfate solution obtained by the next filtration, and evaporated and...

Embodiment 3

[0042] Take 1 ton of fly ash containing 30% alumina, grind it into -100 mesh fine powder, remove iron by magnetic separation, and roast at 700°C for 1 hour to obtain activated fly ash.

[0043] Combine activated fly ash with 96% concentrated H 2 SO 4 Mix 1.35 tons evenly, place it on the carrier plate in the tunnel kiln, raise the temperature to 350°C and roast it for 30 minutes, and burn it to dry slag before it comes out of the furnace.

[0044] Use 4 tons of hot water at 90°C to immerse the roasted dry residue to dissolve the aluminum sulfate therein, and filter to obtain an aluminum sulfate solution.

[0045] The filtrate was evaporated and concentrated, and the evaporated water vapor was condensed and then returned to the leaching process. After the concentrated solution was cooled, aluminum sulfate crystals were precipitated, filtered, and 2000Kg of solid crystals were collected. The filtrate was added to the aluminum sulfate solution obtained by the next filtration, ...

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Abstract

The invention discloses a preparing method of alumina through fly ash, which comprises the following steps: grinding fly ash; sintering; activating; stirring with H2SO4 evenly to sinter into dried slag; immersing through hot water; stripping aluminum sulfate; condensing; cooling to evolve aluminum sulfate; crystallizing; heating; dehydrating to obtain anhydrous aluminum sulfate; heating; decomposing to obtain gamma-Al2O3.

Description

technical field [0001] The invention belongs to the refinement and comprehensive utilization of fly ash, and relates to a method for producing alumina from fly ash, in particular to a method for preparing alumina from fly ash and concentrated H 2 SO 4 A method of preparing alumina by mixing and direct roasting. Background technique [0002] A large amount of fly ash emitted by coal-fired power plants has caused serious pollution to the surrounding agricultural production and living environment. Comprehensive treatment of fly ash has become an urgent environmental problem that needs to be solved. In my country, the amount of fly ash discharged by coal-fired power plants is as high as hundreds of millions of tons every year, and the stockpile is very large. Al in fly ash 2 o 3 The content is relatively high, about 20-40%. Due to the large stockpile, it is a treasure house of resources with great value for refined and comprehensive development and utilization. [0003] Ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/30
Inventor 秦晋国翟玉春蒋训雄白光辉
Owner PINGSHUO INDAL
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