In the process of smelting ferronickel pig iron in a closed paste submerged arc furnace, the powdered laterite is sintered into balls, briquetted, and molded into the furnace. It can improve the gas permeability of the charge, reduce the rotary kiln, and restore the original ringing failure of the charge. In order to avoid the high water content of the sintering material, it is improper to add lime to absorb the excess water of the sintering material.
Lime will worsen the air permeability of the sinter material, and it needs more anthracite combustion to decompose sodium hydroxide and remove moisture. It is not as economical as to use submerged arc furnace hot flue gas or anthracite to burn and dry laterite ore.