Question

Why cement beneficiation is done?

(a) To remove silica and iron content

(b) To remove silica and aluminum content

(c) To remove silica and sulfur content

(d) To remove silica and magnesium content

I had been asked this question in semester exam.

My doubt is from Inorganic Chemical in section Inorganic Chemical Industries of Chemical Technology

Answer 1

The correct answer is (a) To remove silica and iron content

To explain I would say: Much of the locally available limestone has too high a silica and iron content for direct use in cement manufacture. These undesirable constituents can be removed by ore dressing or beneficiation methods which are based on fluid mechanics and adsorption.