Takashi Nakamura
Tohoku University, Japan
Title: Urban mining development of critical metals from WEEE
Biography
Biography: Takashi Nakamura
Abstract
Word of “Urban mining” is one of important message to achieve a sustainable development in future.If any recovery system is not taken into consideration, critical metals will dissipate all over the land in the future. In the case of WEEE, however when Cu, Au and Ag are collected for recycling, rare metals can also begathered with them. If critical metals are separated from WEEE by proper technique and are accumulated for reservation, we can consider them as resources. A possibility of critical metals recycling was shown in this presentation that could have a self-supporting economical system by devising the collection system and by changing the recycling system related with a commercial transaction.WEEE are dismantled and crushed to various parts in first step after collecting. There are many methods for dismantling such as hand-picking and for crushing such as shredding. Sorting techniques are applied to separate each material for example iron & steels, non-ferrous alloys including aluminum and copper and plastics. These sorting techniques are not only real sorting processes but include gravity separation, magnetic separation and so on which are mainly used for processing of old minerals. Also in the case of metallurgical production with its intrinsic potential of smelting, extraction, enrichment and separation methods, related technology and process flow sheets each with their own selectivity and yield play an important role in the context of minor rare metals.
