Development of value-added products from alumina industry mineral wastes using low-temperature-setting phosphate ceramics

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A room-temperature process for stabilizing mineral waste streams has been developed, based on acid-base reaction between MgO and H3PO4 or acid phosphate solution. The resulting waste form sets into a hard ceramic in a few hours. In this way, various alumina industry wastes, such as red mud and treated potliner waste, can be solidified into ceramics which can be used as structural materials in waste management and construction industry. Red mud ceramics made by this process were low-porosity materials ({approx}2 vol%) with a compression strength equal to portland cement concrete (4944 psi). Bonding mechanism appears to be result of reactions ... continued below

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9 p.

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Wagh, A. S.; Jeong, Seung-Young & Singh, D. January 1996.

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Description

A room-temperature process for stabilizing mineral waste streams has been developed, based on acid-base reaction between MgO and H3PO4 or acid phosphate solution. The resulting waste form sets into a hard ceramic in a few hours. In this way, various alumina industry wastes, such as red mud and treated potliner waste, can be solidified into ceramics which can be used as structural materials in waste management and construction industry. Red mud ceramics made by this process were low-porosity materials ({approx}2 vol%) with a compression strength equal to portland cement concrete (4944 psi). Bonding mechanism appears to be result of reactions of boehmite, goethite, and bayerite with the acid solution, and also encapsulation of red mud particles in Mg phosphate matrix. Possible applications include liners for ponds and thickned tailings disposal, dikes for waste ponds, and grouts. Compatability problems arising at the interface of the liner and the waste are avoided.

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9 p.

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OSTI as DE96010812

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  • 4. international alumina quality workshop, Darwin (Australia), 2-7 Jun 1996

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  • Other: DE96010812
  • Report No.: ANL/ET/CP--88519
  • Report No.: CONF-9606172--1
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 228508
  • Archival Resource Key: ark:/67531/metadc667881

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 7, 2015, 4:43 p.m.

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Wagh, A. S.; Jeong, Seung-Young & Singh, D. Development of value-added products from alumina industry mineral wastes using low-temperature-setting phosphate ceramics, article, January 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc667881/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.