Method for preparing silicon-titanium aluminum oxide by carrying out deferrization on coal ash in activating way

A technology of fly ash and alumina, which is applied in the field of silicon-titanium-alumina, can solve the problems of volatile, reducing, aluminum loss, etc.

Inactive Publication Date: 2013-06-05
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an iron remover, hydrochloric acid has the following disadvantages: strong corrosion, volatile, high equipment requirements, easy to reduce the aluminum content in fly ash, and has no effect on removing iron impurities

Method used

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  • Method for preparing silicon-titanium aluminum oxide by carrying out deferrization on coal ash in activating way
  • Method for preparing silicon-titanium aluminum oxide by carrying out deferrization on coal ash in activating way
  • Method for preparing silicon-titanium aluminum oxide by carrying out deferrization on coal ash in activating way

Examples

Experimental program
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Effect test

Embodiment

[0026] The fly ash produced by Tianjiaan Power Plant in Huainan, China was used as the raw material, and its chemical composition is listed in Table 1.

[0027] Table 1 Chemical composition of fly ash

[0028] Fe 2 o 3 al 2 o 3 SiO 2 CaO MgO TiO 2 burn reduction 3.99 33.00 58.40 2.70 1.60 0.24 1.25

[0029] The unit in the table is: mass percentage

[0030] Weigh 10 g of mechanically ground fly ash (particle size less than 30 microns) into a polytetrafluoroethylene beaker, and add 140 mL of NaOH solution with a concentration of 25% by mass. Keep the reaction at 90°C for 2.5 hours in a water bath with a stirrer, filter with suction, wash, and dry to obtain activated fly ash.

[0031] Depend on figure 1 and figure 2 By comparison, it can be seen that the smooth glass phase layer on the original particle surface has basically disappeared, and the mineral components wrapped by the glass phase are exposed on the surface. At the same ...

Embodiment 2

[0047] Example 2 is basically the same as Example 1, except that in step 1, the concentration of NaOH is 20% by mass, the temperature is kept at 100° C., and the reaction is stirred for 3.0 hours. In step 2, the leaching temperature is 80° C., and the leaching time is 2 hours. The mixed acid used contains the sulfuric acid of 70g of oxalic acid and 0.023mol in every liter of mixed acid solution.

Embodiment 3

[0048] Example 3 is basically the same as Example 1, except that in step 1, the concentration of NaOH is 30% by mass, the temperature is maintained at 80° C., and the reaction is stirred for 2.0 hours. In step 2, the leaching temperature is 60° C., and the leaching time is 4 hours. The mixed acid used contains 50 g of oxalic acid and 0.5 mol of sulfuric acid in every liter of mixed acid solution.

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Abstract

The invention discloses a method for preparing silicon-titanium aluminum oxide by carrying out deferrization on coal ash in an activating way. The method comprises the following steps of: firstly mechanically grinding the coal ash, grinding the coal ash till granularity is less than 30 micrometers, and then adding NaOH to the ground coal ash, wherein the concentration of NaOH is 20%-30% by mass percent, and the optimum concentration is 25% by mass percent; keeping the temperature at 80-100 DEG C, preferably 90 DEG C, and stirring to react for 2.0-3.0 hours; carrying out suction filtration, washing, and drying to obtain activated coal ash; then immersing the activated coal ash into a mixed acid, wherein the mixed acid is the mixed solution of oxalic acid and sulfuric acid, the immersion temperature is 60-80 DEG C, and the immersion time is 2-4 hours; then carrying out the suction filtration, washing, and drying to prepare a target product, namely silicon-titanium aluminum oxide. The method disclosed by the invention enhances the activity of ferrum impurities contained in the coal ash by adopting a physical and chemical activation process, prevents the defects of low weak acid deferrization rate, high cost, high leaching loss ratio caused by strong acid, high corrosion and pollution by adopting the mixed acid as a pickling deferrization agent and can be used for extracting silicon-titanium aluminum oxide by utilizing the coal ash with low aluminum-silicon ratio.

Description

technical field [0001] The invention relates to a method for preparing silicon-titanium-aluminum oxide, a raw material of silicon-titanium-aluminum alloy, by using fly ash, specifically a method for preparing silicon-titanium-aluminum oxide by activating and removing iron from fly ash. Background technique [0002] "Application of Extracting Alumina from High-alumina Fly Ash" (Zhang Yusheng, Zhang Wei. "Comprehensive Utilization of Fly Ash" 2010, 03; 20-22) introduces the development and development of Datang International to extract alumina from high-alumina fly ash. Alumina technology. The process uses high-alumina fly ash with an alumina content of 45% to 50% in fly ash as the main raw material, and uses pre-desilication-soda lime sintering and electrothermal methods to produce aluminum-silicon-titanium alloys. The utilization of fly ash, especially the utilization of high added value, provides the possibility for the large-scale utilization of high-performance aluminum-s...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06
CPCY02P10/20
Inventor 邵群李森邱俊斌邓军
Owner ANHUI UNIV OF SCI & TECH
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