sifter will tell u the size. ■

Originally Posted by mohang

Any one please tell me what does a size of (-) 300 mm coal means.

It means that the material is coal and that the largest lump size is 300mm, this being the size of the screen it has passed through. But life in materials handling isn't exact so there may be some lumps that have a dimension in one direction in excess of 300mm. ■

the (-) sign indicates the particle of less than 300 mm.

may 2 % higher than 300mm normally for crusher feeding ■