Determination of acidity and alkalinity:

According to the ratio of (CaO+MgO)/(SiO 2 +Al 2 O 3 ) in the ore, the acidity and alkalinity of the ore can be determined.

(CaO+MgO)/(SiO 2 +Al 2 O 3 ) value

Ore nature

<0.5

Acid ore

0.5-0.8

Semi-self-melting ore

0.8-1.2

Self-fluxing ore

>1.2

Alkaline ore

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