Method for producing industrial activated aluminum oxide from pulverized fuel ash

A technology of activated alumina and fly ash, applied in the removal of alumina/aluminum hydroxide, solid waste, etc., can solve the problems of corrosion of metal equipment by hydrochloric acid, high energy and resource consumption, complex process, etc. Utilize the effect of significant benefit, large energy consumption and resource consumption, and simple operation steps

Inactive Publication Date: 2011-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common pickling methods are divided into hydrochloric acid pickling and sulfuric acid pickling. Since hydrogen chloride gas needs to be produced in the production process of hydrochloric acid pickling, the concentration of hydrochloric acid solution made by water absorption is not more than 36%, which requires a lot of extra water consumption. Once the absorption is not complete, hydrogen chloride gas will leak, and hydrochloric acid has a great corrosion effect on metal equipment, thus affecting its popularization and application
Relatively speaking, the sulfuric acid acid leaching method is a relatively ideal method, for example: Chinese invention patent application number 200510048274.9 discloses a method for extracting alumina from fly ash, and 200610048295.5 discloses a method for preparing alumina from fly ash The method for alumina, 2007

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: raw material fly ash is composed of: Al 2 o 3 Content 37.7%, Fe 2 o 3 Content 4.38%, CaO content 3.74%, MgO content 0.54%, SiO 2 The content is 49.9%, and the loss on ignition is 1.92%. The raw fly ash can also use other components and their corresponding amounts.

[0044] Mill the fly ash in a ball mill for 1 hour for mechanical activation; add water according to the mass ratio of fly ash to water 1:3, stir well, and remove unburned black through flotation, which can be used to make carbon black or directly burn Produce heat; remove iron oxide by magnetic separation, and the obtained impurity magnetite powder is used to produce cement, make iron black pigment or ironmaking; combine the fly ash residue after flotation carbon and magnetic separation with concentrated sulfuric acid Prepare a mixed solution with a mass concentration of sulfuric acid of 40%, control the solid-to-liquid ratio (mass ratio) of fly ash to the mixed solution to 1:8, heat and pre...

Embodiment 2

[0046] Example 2: The fly ash used in Example 1 was ball milled in a ball mill for 2 hours to perform mechanical activation; water was added according to the mass ratio of fly ash to water of 1:3, fully stirred, and unburned net was removed by flotation black; then remove iron oxide by magnetic separation; make a mixed solution with a sulfuric acid concentration of 50% from the fly ash residue after flotation carbon and magnetic iron separation and concentrated sulfuric acid, and control the solid-liquid concentration of fly ash and the mixed solution The ratio is 1:7, and the heating and pressurizing reaction is carried out in the acid-resistant reaction equipment for 4 hours. The maximum temperature of the reaction is 240°C and the pressure is 0.1MPa; after the reaction cools down, add water according to the mass ratio of fly ash to water at 1:15, After heating and boiling, the filter cake was obtained by suction filtration, and washed with water with a mass ratio of fly ash ...

Embodiment 3

[0049] Example 3: The fly ash in Example 1 was ball milled in a ball mill for 3 hours to perform mechanical activation; according to the mass ratio of fly ash and water of 1:2, water was added, fully stirred, and unburned net was removed by flotation black; then remove iron oxide by magnetic separation; make a mixed solution with a sulfuric acid concentration of 80% from the fly ash residue after flotation carbon and magnetic iron separation and concentrated sulfuric acid, and control the solid-liquid concentration of fly ash and the mixed solution The ratio is 1:6, and the heating and pressurizing reaction is carried out in the acid-resistant reaction equipment for 5 hours. The maximum temperature of the reaction is 240°C and the pressure is 0.2MPa; after the reaction cools down, add water according to the mass ratio of fly ash to water at 1:10, After heating and boiling, the filter cake was obtained by suction filtration, and washed with water with a mass ratio of fly ash to ...

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PUM

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Abstract

The invention discloses a method for producing industrial activated aluminum oxide from pulverized fuel ash, comprising the following steps: mechanically activating the pulverized fuel ash, floating and removing carbon, magnetically selecting and removing iron, impregnating in sulfuric acid to extract aluminum, separating solid and liquid, condensing rough liquid of aluminum sulfate, re-crystallizing aluminum sulfate, separating solid and liquid for the second time, dehydrating and drying aluminum sulfate, and calcining aluminum sulfate at a high temperature so as to obtain the industrial activated Al2O3 in which the content of Fe2O3 is lower than 0.5%; and the method completely meets the technical requirement of HG/T3927-2007 industrial activated aluminum oxide. The method is simple in technique, short in flow, easy to control production process, high in aluminum oxide extract rate, low in production cost, low in impurity content, and stable in quality.

Description

technical field [0001] The present invention relates to a method for resource utilization and comprehensive utilization of fly ash, in particular to a method for producing industrial activated alumina from fly ash, that is, a certain concentration of sulfuric acid is used to heat and pressurize to leach aluminum sulfate, and after concentration, use The method of recrystallization removes iron and prepares industrial aluminum sulfate with Fe content lower than 0.02%, and aluminum sulfate is directly calcined to obtain industrial active Al with iron oxide content lower than 0.5%. 2 o 3 . Background technique [0002] Fly ash is the solid residue left after coal combustion in coal-fired power plants. In 2007, my country's fly ash emissions reached 2.5 billion tons. It is estimated that by 2020, the national fly ash emissions will reach more than 5 billion tons. The improvement of comprehensive utilization level and utilization rate of fly ash is related to the healthy develo...

Claims

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Application Information

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IPC IPC(8): C01F7/02B09B3/00
Inventor 余红发武金永吴成友麻海燕王梅娟董金美李颖李成栋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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