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The size of the grain is called slime. There is no uniform concept. It depends on the specific ore, the sorting method, and the sorting equipment. For crushing and screening operations, some plants refer to the size of less than 3 mm as slime, and some to less than 0.074 mm as slime. For the sorting operation, the size of the granularity is considered to be not uniform for the slime, and is generally related to the lower limit of the granularity of the selected method and equipment. For example, flotation considers less than 10 or 5 mm as slime, shaker -0.074 mm or -0.044 mm as slime, and spiral chute as -19 micron as slime.
The slime is mushy in contact with water, causing serious blockage, which will cause difficulties in crushing, screening and ore transportation. The effect of the slime on the sorting operation is also very bad, which will interfere with the sorting process and effect, and has a bad influence on the dewatering of concentrates, resulting in concentration of fine and tailings and difficulty in filtration.
Therefore, in the process of crushing and grinding, it is necessary to avoid the generation of secondary slime. If the content of the original slime is high, which affects the crushing and the sifting operation, it can be added to the washing operation to remove the slime.
The mud contained in the ore is called slime. The slime has the distinction of primary and secondary slime. The primary slime is the muddy material from the ore deposit. The secondary slime is caused by the looseness of the ore and the brittleness of the ore. It is caused by excessive crushing during the crushing and grinding process.