Q1: A simple closed grinding circuit may consist of

ANS:A - a ball mill and a classifier.

A simple closed grinding circuit may consist of a ball mill and a classifier. Explanation:

• In a closed grinding circuit, the ground material is circulated within the system and undergoes classification to separate the desired product from the oversize particles.
• A ball mill is a type of grinder used to grind materials into fine powder. It consists of a rotating drum filled with grinding media such as steel balls. The material to be ground is fed into the drum, and as the drum rotates, the grinding media crush and grind the material into a fine powder.
• After grinding in the ball mill, the ground material is typically passed through a classifier. The classifier separates the ground material into different size fractions based on particle size. This classification process allows for the separation of fine particles (product) from coarse particles (oversize), ensuring that the desired product size is achieved.
• The oversize particles from the classifier may be returned to the ball mill for further grinding, completing the closed circuit loop.