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Nickel slag is a metallurgical solid waste from the nickel refineries, which can be recycled as one of excellent secondary sources due to the amounts of iron contents. The iron content can reach up to 50 wt%.1,2) With the growing demand of nickel products nowadays, nickel slag is discharged continuously. It is estimated that 6–16 tons of nickel slag in flash smelting process are generated per ton of nickel produced.3,4) Taking Jinchuan Group Co. Ltd (Yinchuan, China) as an example, ~160 tons of granulated nickel slag are output annually and more than 33 million tons of the nickel slag have been accumulated to date. Generally, these waste streams are utilized in sectors like road construction, fertilizer and cement manufacture, while the rest are stockpiled in heaps or controlled in landfills.5) The negligent disposal raises serious environmental concerns and valuable resources waste.6,7) Therefore, effective technology for iron extraction from the nickel slag is deeply essential to the sustainable development of resource and environment. Hydrometallurgy is regarded as an effective method to extract metals from waste slags including flotation, leaching, roasting followed by leaching and bioleaching.8,9) Nevertheless, its production efficiency is limited and the disposal of waste water produced is difficult.10) Compared with the hydrometallurgical processes, liquid waste would not be generated by pyrometallurgical methods. Moreover, considerable sensible heat contained in the molten nickel slag can used adequately.11) Therefore, pyrometallurgical methods are used mainly for slag treatment in today’s recovery of Recycling Nickel Slag by Aluminum Dross: Iron-extraction and Secondary Slag Stabilization