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ID number:397205
 
Author:
Evaluation:
Published: 27.01.2008.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Hroms Cr
Atrašanās dabā
Zemes garozā 0,02%
Pēc izplatības 21.elements
Nav sastopams brīvā veidā
Atrodams vairāk nekā 40minerālos, daži no tiem:
Dzelzs hromīts (FeO·Cr2O3 jeb Fe(Cr2)2)
Krokoīts (PbCrO4)
Iegūšana
Ja dzelzs hromītu stipri karsē kopā ar ogli, vienlaikus reducējas hroms un dzelzs. Rezultātā veidojas hroma un dzelzs sakausējums – ferohroms. Lai iegūtu tīru hromu, no dzelzs hromīta vispirms atdala Cr2O3 un tad to reducē ar alumīniju…

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