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Stabilization of nickel by aluminum-...

Shih, Kaimin.

Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior.
Author:	Shih, Kaimin.
Description:	114 p.
Notes:	Adviser: James O. Leckie.
Notes:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4423.
Contained By:	Dissertation Abstracts International66-08B.
Subject:	Engineering, Environmental.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3186400
ISBN:	9780542286933

Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior.
Shih, Kaimin.

Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior. - 114 p.

Adviser: James O. Leckie.

Thesis (Ph.D.)--Stanford University, 2005.

Nickel-incorporation efficiency was quantitatively estimated by powder X-ray Diffraction (XRD) analysis. With 3-hours sintering, NiFe2O 4 (trevorite) formation took place above 600°C with more than 95% nickel incorporation efficiency achieved above 1000°C; while NiAl 2O4 crystallized above 1000°C with an efficiency >90% above 1250°C. In using kaolinite and mullite as precursors, nickel is not incorporated in any silicon-containing phase.

ISBN: 9780542286933Subjects--Topical Terms:

212478
Engineering, Environmental.

Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior.
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245 1 0 $a Stabilization of nickel by aluminum- and iron-rich ceramic materials: Reaction pathways and product leaching behavior.
300 $a 114 p.
500 $a Adviser: James O. Leckie.
500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4423.
502 $a Thesis (Ph.D.)--Stanford University, 2005.
520 # $a Nickel-incorporation efficiency was quantitatively estimated by powder X-ray Diffraction (XRD) analysis. With 3-hours sintering, NiFe2O 4 (trevorite) formation took place above 600°C with more than 95% nickel incorporation efficiency achieved above 1000°C; while NiAl 2O4 crystallized above 1000°C with an efficiency >90% above 1250°C. In using kaolinite and mullite as precursors, nickel is not incorporated in any silicon-containing phase.
520 # $a Prolonged leach tests of NiO, NiAl2O4, NiFe 2O4 and sintered kaolinite + NiO samples were carried out using the TCLP extraction fluids #1 and #2 to evaluate the durability of sintered products. Over longer leaching periods, spinel proved superior to NiO for immobilization of nickel, although NiFe2O4 appears slightly more leachable than NiAl2O4. With TCLP extraction fluid #1 (pH 4.9), the observed leachate concentrations suggest incongruent dissolution of spinels or strong reprecipitation of trivalent cations. With TCLP extraction fluid #2 (pH 2.9), NiAl2O4 maintained congruent dissolution with no significant reprecipitation, but NiFe2O4 leachates showed significant iron reprecipitation as ferric hydroxide (Fe(OH)3 ). This study has demonstrated the success of stabilizing simulated nickel-laden sludge from a wide-range of construction ceramic precursors, and may provide an avenue for an economical solution of heavy metal waste sludges problem.
520 # $a The feasibility of stabilizing nickel-laden sludge with commonly available ceramic precursors was investigated. Nickel aluminate spinel (NiAl2O 4) was the immobilization phase produced when NiO was sintered with aluminum-rich precursors, including gamma-Al2O3, corundum, kaolinite and mullite. Analogously, nickel ferrite spinel (NiFe2O 4) was the stable phase produced by firing NiO with hematite, as an iron-rich precursor. By using gamma-Al2O3 as the precursor, the NiAl2O4 formation mechanism was a reaction between NiO and gamma-Al2O3 at lower temperatures (990°C), while the reaction was between NiO and corundum at higher temperatures. When sintering NiO with kaolinite, nickel can be efficiently incorporated in NiAl2O4 by two mechanisms: (i) a low temperature reaction with a defect spinel, and (ii) a high temperature reaction with mullite.
520 # $a The kinetic factors responsible for nickel incorporation efficiency from different precursors were revealed through investigation of product microstructures. Moreover, four raw material mixing procedures were compared, with the ball-milled slurries demonstrating the highest nickel incorporation efficiency.
590 $a School code: 0212.
650 # 0 $a Engineering, Environmental. $3 212478
650 # 0 $a Engineering, Materials Science. $3 226940
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710 0 # $a Stanford University. $3 212607
773 0 # $g 66-08B. $t Dissertation Abstracts International
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790 1 0 $a Leckie, James O., $e advisor
791 $a Ph.D.
792 $a 2005
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