Gangue is the solid waste in the process of coal mining & washing with the main component of alumina, silicon oxide, iron oxide, calcium oxide, magnesium oxide, sodium oxide, etc. The gangue emissions occupy 10%-15% of the total coal emissions.

A  granite crushing line is usually determined by several factors: The raw material was crushed. Hardness, percentage of silicon, moisture percentage of raw material. The average size of raw materials enter into crushing system. Required product size, proportion and their usage. The load per hour of crushing production line.