Method for extracting alumina and gallium oxide from pulverized fuel ash to prepare aluminum oxide nanometer and polymeric ferric silicate sulfate

A technology of polysilicate ferric sulfate and nano-alumina, which is applied in the fields of alumina/aluminum hydroxide, chemical instruments and methods, and inorganic chemistry, and can solve problems such as low income, poor economic benefits, and low utilization of equipment

Inactive Publication Date: 2012-06-27
潘安标
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] my country is a big country in coal production and coal-fired power generation. Coal-fired power plants emit more than 100 million tons of high-alumina fly ash every year. Furthermore, my country is a big country in the production of aluminum products, and bauxite resources are relatively poor. The lack of bauxite resources restricts the country With the development of the aluminum product industry, the development and utilization of high-aluminum fly ash discharged from coal-fired power plants to produce alumina is one of the important technical problems urgently solved by the country. The research on alumina has proposed many technological methods for extracting alumina from fly ash, such as the method for extracting alumina from fly ash proposed by CN102145904A. In addition to using concentrated hydrochloric acid to generate hydrogen chloride gas, the method needs complicated recovery of hydrogen chloride to produce acid In addition to the equipment, only one type of alumina is recovered, and the utilizatio

Method used

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  • Method for extracting alumina and gallium oxide from pulverized fuel ash to prepare aluminum oxide nanometer and polymeric ferric silicate sulfate
  • Method for extracting alumina and gallium oxide from pulverized fuel ash to prepare aluminum oxide nanometer and polymeric ferric silicate sulfate

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Experimental program
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Embodiment 1

[0025] Embodiment 1 extracts alumina or manufactures nano-alumina with extracted alumina

[0026] According to 85% Al 2 o 3 Dissolution rate calculates the dosage of sulfuric acid, fly ash (Al 2 o 3 Content 45.3 wt%, SiO 2 content of 37.66wt%) and sulfuric acid with a concentration of 40wt% to make fly ash slurry, the ratio of fly ash to sulfuric acid is 1:0.4~0.5, (first adjust the ratio of fly ash and water to 1:1 Slurry, then add sulfuric acid) into the autoclave, react at 230-240°C, 2.8-4.8Mpa for 40-60 minutes, and turn on the mixer to make it fully react, put the reaction-dissolved slurry into the sedimentation tank and dilute and settle , the red mud acid slag flowing from the bottom of the settling tank enters the washing tank, and is reversely washed with hot water at 80-90°C for 4-6 times. , the last washing liquid is returned to the fly ash and sulfuric acid batching. After the last washing, the red mud acid residue is filtered through the filter, the filtrate...

Embodiment 2

[0032] Embodiment 2 extracts gallium oxide

[0033]After adding sodium carbonate to the aluminum sulfate solution for neutralization and decomposition, the gallium in the decomposed mother liquor is concentrated for three cycles and the ion exchange is performed when the concentration of Ga reaches 40 mg / L. LSC600 resin is used for adsorption, the resin is pretreated first, and then the decomposed mother liquor is passed through the resin column at 5ml per minute. When the test outlet concentration reaches 90% of the import value, it is in a saturated state. Stop feeding and elute, and use 4% vulcanization The sodium solution was used for elution and analysis, and the precipitated gallium sulfide was precipitated. The precipitated gallium sulfide was washed three times and filtered, dissolved in 10% NaOH solution and then filtered to obtain a clear solution. Ammonium bicarbonate is dissolved and cooled. At this time, gallium carbonate is precipitated, filtered and washed three...

Embodiment 3

[0034] Embodiment 3 prepares ferric sulfate polysilicate

[0035] The ferrosilicon slag after ferrosilicon removal is sent to the polymerization reaction tank and injected with ferric sulfate solution for polymerization reaction. The temperature is controlled at 40-55°C, and the ferric sulfate solution is added under stirring. The pH value is controlled at 3.5-4, and the polymerization reaction time is 24 Hours, stop stirring when the reaction is over, use a high-pressure pump to send it into a spray dryer, and get polysilicate ferric sulfate flocculant through the spray dryer.

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Abstract

Provided is a method for extracting alumina and gallium oxide from pulverized fuel ash to prepare aluminum oxide nanometer and polymeric ferric silicate sulfate. Pulverized fuel ash and sulfuric acid are sent to a high-pressure autoclave to react by heating and pressurizing so as to generate slurry, and after dilution separation, neutralization desilicication of iron, carbonation decomposition, washing and dehydration and roasting, aluminum oxide is obtained. Nitric acid is added to the prepared aluminium hydroxide for reduction to prepare aluminium nitrate. The aluminium nitrate is added with carbamide and enters a microwave oven to be roasted to ashes, and aluminum oxide nanometer is obtained. Aluminum sulfate solution which has subjected to separation is added to sodium carbonate for neutralization and decomposition, and filtrated stock is sent to an ion resin exchange column to extract gallium oxide. Aluminum hydroxide is added to sodium hydroxide, and then silicon iron filter residue is obtained by filtering. Ferric sulfate is added for polymerization reaction to obtain polymeric ferric silicate sulfate. By adopting the technique of decomposing pulverized fuel ash with sulfuric acid in a high-temperature high-pressure mode, a plurality of industrial products are can be obtained respectively. Compared with an existing hydrochloric acid decomposition method, the method for extracting alumina and gallium oxide from pulverized fuel ash to prepare aluminum oxide nanometer and polymeric ferric silicate sulfate increases comprehensive utilization value of pulverized fuel ashand has great economic benefits.

Description

[0001] technical field [0002] The invention relates to a comprehensive development and utilization technology of fly ash, in particular to a method for extracting alumina, nano-alumina, gallium oxide and polysilicate ferric sulfate from fly ash. Background technique [0003] my country is a big country in coal production and coal-fired power generation. Coal-fired power plants emit more than 100 million tons of high-alumina fly ash every year. Furthermore, my country is a big country in the production of aluminum products, and bauxite resources are relatively poor. The lack of bauxite resources restricts the country With the development of the aluminum product industry, the development and utilization of high-aluminum fly ash discharged from coal-fired power plants to produce alumina is one of the important technical problems urgently solved by the country. The research on alumina has proposed many technological methods for extracting alumina from fly ash, such as the method...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01G15/00C01B33/20B09B3/00
CPCY02P20/54Y02W30/82
Inventor 潘安标
Owner 潘安标
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