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ID number:458071
 
Author:
Evaluation:
Published: 16.12.2009.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Dabā tas galvenokārt sastopams hromīta rūdas veidā (FeCr2O4). Hroms brīvā veidā nav sastopams, bet tā savienojumi vidē var atrasties dažādās to oksidēšanās pakāpēs – ar oksidēšanās pakāpi no hroms (II) līdz hroms (VI), bet tipiski sastopami trīsvērtīgā hroma jeb hroma (III), kā arī sešvērtīgā jeb hroma (VI) savienojumi.Aptuveni 99 procenti hroma ir atrodami Dienvidāfrika un Zimbabvē. Lai iegūtu tīru hromu, no hroma rūdas samērā sarežģītos procesos atdala hroma(III) oksīdu, tad to reducē ar alumīniju un attīra elektrolītiski.

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