Anthropogenic Nickel Cycle: Insights into Use, Trade, and Recycling

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Abstract
The anthropogenic nickel cycle for the year 2000 was analyzed using a material flow analysis at multiple levels: 52 countries, territories, or country groups, eight regions, and the planet. Special attention was given to the trade in nickel-containing products at different stages of the cycle. A new circular diagram highlights process connections, the role and potential of recycling, and the relevance of trade at different life stages. The following results were achieved. (1) The nickel cycle is dominated by six countries or territories: USA, China and Hong Kong, Japan, Germany, Taiwan, and South Korea; only China also mines some of its nickel used. (2) Nickel is mostly used in alloyed form in stainless steels (68%). (3) More scrap is used for the production of stainless steels (42%) than for other first uses (11%). (4) Industrial machinery is the largest end use category for nickel (25%), followed by buildings and infrastructure (21%) and transportation (20%). (5) 57% of discarded nickel is recycled within the nickel and stainless steel industries, and 14% is lost to other metal markets where nickel is an unwanted constituent of carbon steel and copper alloy scrap.
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