Coal processing specification classification

raw coal

It refers to the ground or from underground coal mining hair screened after machining away the coal gangue, pyrite and the like. The unwashed and unprocessed coal produced by the coal mine is also called raw coal. Including natural coke and inferior coal, excluding low calorific value coal.

Washing coal

It refers to the removal and reduction of impurities such as vermiculite and sulfur contained in raw coal after washing and screening of raw coal, and is divided into several grades of coal according to different coal types, ash, calorific value and particle size. The particle size is classified into 50 mm, 258 mm, 20 mm, 13 mm, and 6 mm or less. Washing coal can be divided into washing raw coal, washing coal, mixing coal, washing mixed coal, mixed coal, washing coal, coal, washing coal, pulverized coal and other varieties. Except for the ash requirement of washing coal blending is less than or equal to 32%, the rest is required to be less than or equal to 40%.

Clean coal

It refers to products that have been produced after selection (dry or wet selection) and meet quality requirements.

Granular coal

It refers to coal produced by screening or selective selection with a lower particle size of more than 6mm and an ash content of 40% or less. According to different particle sizes, it can be divided into washing block, middle block, washing mixed block, mixed middle block, washing mixed block and mixed block, washing large block and large block, washing large block and extra large block, washing small block and small block. , washing coal and granular coal.

Low quality coal

It refers to various coal products with high ash content. Inferior coal is used for boiler combustion, which not only has poor economy, but also causes severe wear of the combustion auxiliary system and convection heating surface and increase of maintenance cost, because the poor coal ash is relatively large, the economy is poor, the ash component is large, and the heated surface is washed and worn. serious.