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Method for purifying aluminum ammonium sulfate

A technology of aluminum ammonium sulfate and aluminum ammonium sulfate hydrate, which is applied in the direction of aluminum sulfate, aluminum sulfur compounds, solution crystallization, etc., can solve the problems of complex treatment process, large amount of extraction agent, introduction, etc., and achieve the effect of simple process flow

Active Publication Date: 2011-07-13
北京世纪地和控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps clean up waste material from industrial processes such as burning coal or producing alkaline solutions containing calcium hydroxide (lime). It also makes it easier to produce high-quality ceramic materials with minimal contaminants added during manufacturing.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency at removing unwanted metals from waste materials like coal burning facilities while minimizing environmental concerns associated therewith. Current techniques involve expensive processes involving acidic solutions followed by complex steps involved in redozation.

Method used

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  • Method for purifying aluminum ammonium sulfate
  • Method for purifying aluminum ammonium sulfate

Examples

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Embodiment 1

[0034] The mixed ingredients of fly ash and ammonium sulfate are sintered, and the obtained sintered solid is dissolved. The main components and respective concentrations of the dissolved liquid are aluminum ammonium sulfate (NH 4 Al(SO 4 ) 2 ) 106.9g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 )8.5g / L, ammonium sulfate ((NH 4 ) 2 SO 4 ) 161.4g / L, etc., the raw material solution was cooled to 20°C, and the first crystal was precipitated. The first crystals dissolve at 90°C at a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 )502g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 6.8g / L, the solution was cooled to 20°C for the second crystallization, and the second crystal was obtained after filtration and separation. The second crystal is dissolved in water at 90°C with a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 )505g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 0.8g / L, this solution is cooled to 20 ℃, carries out the third ...

Embodiment 2

[0036] The mixed ingredients of fly ash and ammonium sulfate are sintered, and the obtained sintered solid is dissolved. The main components and respective concentrations of the dissolved liquid are aluminum ammonium sulfate (NH 4 Al(SO 4 ) 2 ) 120.1g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 )5.5g / L, ammonium sulfate ((NH 4 ) 2 SO 4 ) 41.4g / L, etc., the raw material solution was cooled to 40°C, and the first crystal was precipitated. The first crystals dissolve at 80°C at a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 ) 402g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 2.8g / L, the solution was cooled to 40°C for the second crystallization, and the second crystal was obtained after filtration and separation. The second crystal is dissolved in water at 80°C with a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 ) 403g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 0.4g / L, this solution is cooled to 40 ℃, carries out the third...

Embodiment 3

[0038] The mixed ingredients of fly ash and ammonium sulfate are sintered, and the obtained sintered solid is dissolved. The main components and respective concentrations of the dissolved liquid are aluminum ammonium sulfate (NH 4 Al(SO 4 ) 2 ) 101.7g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 )3.5g / L, ammonium sulfate ((NH 4 ) 2 SO 4 ) 60.9g / L, etc., the raw material solution was cooled to 30°C, and the first crystal was precipitated. The first crystals dissolve at 70°C at a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 ) 299g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 1.3g / L, the solution was cooled to 30°C for the second crystallization, and the second crystal was obtained after filtration and separation. The second crystal is dissolved in water at 70°C with a concentration of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 )307g / L, ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 ) 0.1g / L, the solution was cooled to 30°C, and the third crystall...

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Abstract

The invention relates to a method for purifying aluminum ammonium sulfate. The aluminum ammonium sulfate is selected from the dissolved liquid of the aluminum ammonium sulfate, and the dissolved liquid of the aluminum ammonium sulfate is a product obtained by roasting coal ash and ammonium sulfate and then dissolving out a roasted solid material, wherein the dissolved liquid of the aluminum ammonium sulfate comprises aluminum ammonium sulfate, ammonium sulfate and ammonium ferric sulfate; and the concentration of aluminum ammonium sulfate is 100g/L-600g/L. The aluminum ammonium sulfate is purified by using a mode of cooling crystallization for at least three times. By using the method for purifying the aluminum ammonium sulfate, the aluminum ammonium sulfate can be effectively obtained by roasting the mixed batch of coal ash and ammonium sulfate and then dissolving the roasted solid out. The purified aluminum ammonium sulfate is used for producing alumina; and the process flow is relatively simple, novel impurity is not introduced, and the loss of aluminum ammonium sulfate is not caused.

Description

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Claims

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Application Information

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Owner 北京世纪地和控股有限公司
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