After mixing the concentrate powder and the limestone powder, it is rolled or pressed into a green ball having a diameter of 10-30 mm, and dried and baked at a high temperature to consolidate the particles. This spherical mineral is called a pellet. The pellets have uniform particle size, good gas permeability and reducibility. However, the temperature control of pellet baking is stricter than sintering. Pellet ore also requires fine grain size and low water content of the ore powder. Pellets oxide pellets and metal pellets of two kinds.
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