Process method for producing high-purity aluminum oxide and silicate by using pulverized fuel ash

A technology of high-purity alumina and a process method, which is applied in the field of fly ash resource utilization, can solve the problems of unsuitable radioactive fly ash, harsh operating conditions, secondary pollution of tailings, etc. The effect of low temperature and less tailings

Active Publication Date: 2012-10-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the patented technologies for resource utilization of fly ash that have been disclosed now have their own shortcomings, such as high energy consumption, harsh operating conditions, com

Method used

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  • Process method for producing high-purity aluminum oxide and silicate by using pulverized fuel ash

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 Extraction of alumina and silica from high alumina fly ash

[0025] The chemical composition of high-alumina fly ash samples from a thermal power plant in Inner Mongolia is shown in Table 1.

[0026] Table 1 Chemical composition of high alumina fly ash samples

[0027] Element Al 2 o 3 SiO 2 total iron oxide TiO 2 CaO Loss on ignition sum Content (%) 48.45 34.99 1.92 1.54 3.64 1.31 91.85

[0028] [0028] use figure 1 As shown in the process flow, take 20 grams of high-alumina fly ash ball-milled to -200 mesh, add 7.2 grams of sodium carbonate (Na 2 O-Al 2 o 3 -SiO 2 Na in the ternary system 2 O mass percentage is 20%), mechanically mixed, added 5.4 mL of water to make a slurry, then transferred to a 50 mL corundum crucible, and baked at 900oC for 3 hours. Take it out, cool to room temperature, and wash with 50 mL of water. The filter residue was leached with 100 mL of 4M sulfuric acid for 1 hour. filter. ...

Embodiment 2

[0030] Example 2 Extracting alumina from high aluminum fly ash

[0031] The composition of the high alumina fly ash used in this example is the same as that in Example 1. use figure 1 Shown technological process, get ball milling to-200 purpose embodiment one high aluminum fly ash 20 grams, add ball milling to-200 purpose sodium carbonate 15 grams (Na 2 O-Al 2 o 3 -SiO 2 Na in the ternary system 2O mass percentage is 34.5%), mixed mechanically, added 9 mL of water to make a slurry, then transferred to a 50 mL corundum crucible, and baked at 900oC for 2 hours. Take it out, cool to room temperature, and wash with 100 mL of water. The filter residue was leached with 100 mL of 2M sulfuric acid for 1 hour. filter. The filter cake was washed with 100 mL of water. The washings were filtered and combined with the filtrate. Concentrate the leaching solution to 100 mL under heating, then add 60 g of ammonium sulfate and heat to dissolve. Cool to room temperature, filter, wash...

Embodiment 3

[0032] Example 3 Extraction of alumina and silica from fly ash of thermal power plant

[0033] The chemical composition of the fly ash sample from a thermal power plant in Tianjin is shown in Table 2.

[0034] Table 2 Chemical composition of fly ash samples

[0035] Element SiO 2 Al 2 o 3 K 2 o CaO Na 2 o TFeO TiO 2 ZnO sum of ingredients content(%) 48.05 37.87 3.16 3.11 2.53 3.34 1.27 0.30 99.63

[0036] use figure 1 As shown in the process flow, take 20 grams of the above fly ash ball milled to -200 mesh and 10 grams of sodium carbonate ball milled to -200 mesh, after mechanical mixing, add 5 mL water to make a slurry, and transfer it to a 50 mL corundum crucible , baked at 1000oC for 40 minutes. Remove and cool to room temperature. Wash once with 100 mL of water. Then leached with 100mL 6M sulfuric acid for 2 hours. Filter, the filter cake is washed once with 100mL water, and the washing liquid is filtered and combi...

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Abstract

The invention discloses a process method for producing high-purity aluminum oxide and silicate by using pulverized fuel ash and belongs to the technical field of pulverized fuel ash resource utilization. Aluminum oxide and parts of silicon oxide in the pulverized fuel ash and uranium, thorium and other elements in radioactive pulverized fuel ash are recycled by means of the process method, accordingly the pulverized fuel ash resource utilization and remarkable reduction of solid wastes are achieved, quantity of tailings does not reach quarter of weight of original pulverized fuel ash, and the purity of the aluminum oxide and the silicate produced by means of the process method is high. The industrialization of the process flow of the process method is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of fly ash resource utilization, and in particular relates to a process for producing high-purity alumina and silicate from fly ash. Background technique [0002] The main components of fly ash are aluminum oxide and silicon dioxide, which account for more than 85% of its weight, so it is a relatively large source of silicon and aluminum. In 2010, the annual production of fly ash in my country was about 500 million tons. Calculated at 30% content, the alumina content in the fly ash produced in my country in that year was about 150 million tons. In 2010, the total output of alumina in my country was only 29.94 million tons, and the total output of the world (including my country) was only 86.28 million tons. In addition, fly ash from certain sources contains high concentrations of iron oxide and scattered and scarce metal elements such as gallium and germanium. The fly ash produced by pit-mouth power plants ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/12B09B3/00
Inventor 王毅梁振凯徐辉
Owner TSINGHUA UNIV
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