General Flashcards
(11 cards)
1
Q
it ranks about _____ in natural abundance among the elements in crustal rocks
A
21st
2
Q
It melts at _____ degree Celsius
A
1,615
3
Q
Chromite Chemical Formula
A
FeCr2O4
4
Q
Chromite is the only chromium ore mineral with an average Cr₂O₃ content of how many percent?
A
67.9%
5
Q
____ the production of chromium goes into metallic products
A
half
6
Q
another ____ is used in refractories
A
third
6
Q
The chief use of chromium is to form alloys with ____
A
iron, nickel, or cobalt
7
Q
The extensive use of chromite as a refractory is based on its:
A
- high melting point
- its moderate thermal expansion
- the stability of its crystalline
structure
8
Q
chrome to iron ratio (Cr:Fe) - Metallurgical
A
2.4-3.2:1
9
Q
chrome to iron ratio (Cr:Fe) - Refractory
A
1.8-2.3:1
10
Q
impurities of chromite
A
oxides of iron, aluminum, magnesium and calcium
