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18 Feb 2008, 1:44 AM
| #16 (permalink) |
| Senior Member HSC: 2005 Gender: Male Location: Newcastle
Join Date: Jun 2004
Posts: 246
Last Activity:
Yesterday, 11:11 PM  | Re: Assignment: "Industrial Separation of a Mixture" You can hide this advertisement by registering. The bauxite is dissolved in sodium hydroxide which produces [Al(OH)4]-. The solution is filtered to remove other ores and Al(OH)3 is precipitated by cooling. The Al2O3 is produced by calcining.Formulae: Al2O3 + NaOH --> Na[Al(OH)4] Na[Al(OH)4] --> Al(OH)3 + NaOH 2 Al(OH)3 --> Al2O3 + 3 H2O Separation of bauxite by froth floatation does not occur because aluminium metal must be produced by electrolysis due to its reactivity. The resulting concentrate from froth floatation is not pure enough for use in an electrolytic process. So to answer your question, there is only one separation process for bauxite. |
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15 Feb 2009, 10:21 AM
| #18 (permalink) |
| New Member HSC: 2010 Gender: Undisclosed
Join Date: Feb 2009
Posts: 1
Last Activity:
15 Nov 2009, 12:40 PM | Re: Assignment: "Industrial Separation of a Mixture" Hi George, I have an assignment on industrial separation methods which result in 2 products! I'm really stumped as to what to do!! Can you please help me and give me a few ideas! Cheers! |
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