Question

Ball clay is a type of clay which has zero percent moisture or water content in it.

(a) True

(b) False

I got this question in a job interview.

My doubt is from Fire Clays, Illite and Kaolinite in section Molding and Core Sands of Casting-Forming-Welding I

Answer 1

The correct option is (b) False

To elaborate: Ball clay normally has water content nearly about 28 percent. To decrease moisture content, they are stored in drying sheds. Then the clay is shredded into small pieces which are further dried by the use of hammer mill. Extracted scrap material from the hammer mill is blended with water to form a slurry mixture for further use.