-- Powdered Coal : It has 0-12 mm diameter and can be used at cement factories, sugar factories, lime factories and heating needs with stoker (without grill) system or for industrial purposes. It is also used as a raw material in the production of briquette coal. -- Nut Coal : It has 12-24 mm diameter and is used to dry moist teas at tea factories, obtain steam in textile factories, wash denim fabric known as blue jeans and in sugar factories and houses with floor heating system. -- Walnut Coal : It has 24-65 mm diameter and is used for heating purposes in dye factories and in houses with floor heating system. -- Lemmon Coal : It has 65-80 mm diameter and is used in houses with floor heating and stove. -- Orange and Watermelon Coal : It has 80-110 mm diameter and is used in houses with a central heating system.