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Question
Blast furnace slag has approximately
A.

45% calcium oxide and about 35% silica

B.
50% alumina and 20% calcium oxide
C.
25% magnesia and 155 silica
D.
25% calcium sulphate and 15% alumina
Answer ( Option A)

45% calcium oxide and about 35% silica

Solution

Blast furnace slag composition

CaO        :        42.4%

SiO2        :        32.3%

 Al2O3     :        13.3%

Fe2O3     :        0.3%

MgO       :        6.4%

 SO3       :        2.1%

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