According to the Raymond mill manufacturer, Raymond mill is a commonly used milling equipment in the mining industry. It is mainly used for high-fine milling processing of various materials in non flammable and explosive mineral, chemical, construction and other industries with Mohs hardness not greater than 9.3 and humidity less than 6%.

This involves a conceptual problem: Mohs hardness. What is the difference between Mohs hardness and what we usually call hardness? Here we first look at these two different concepts.

Because the verification of hardness is destructive, the verification materials are raw stones that are not ground or precious ores. There are two kinds of hardness standards, one is absolute hardness, the other is Mohs hardness (a relative hardness).