An Overview of Nickel Utilization from Laterite Ores -- Fundamentals of Selective Solid-State Reduction and Novel Process for Preparing Ferronickel from Laterite Ores -- Technologies of Slag Formation Control in Electric Arc Furnace Smelting of Laterite Ores -- Softening-Melting Properties of Laterite Ore and their Regulation Technologies for the Krupp-Renn Process and Sintering Process -- Valorization of Ferronickel Slag for Preparing Refractory and Thermal Insulation Materials -- Recycling of Stainless-Steel Pickling Sludge Via RKEF Route.