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Recovery and Recycling of Tungsten by Alkaline Leaching of Scrap and Charged Amino Group Assisted Precipitation
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acssuschemeng.7b04689
Takahiko Makino 1 , Satoshi Nagai 2 , Ferry Iskandar 3 , Kikuo Okuyama 2 , Takashi Ogi 2
Affiliation  

Herein, we present a charged amino group assisted precipitation (CAAP) method for recovery and recycling of high-purity tungsten from a solution obtained by alkaline leaching of cemented carbide (WC–Co alloy) scrap. When lysine hydrochloride, which contains a charged amino group (NH3+), was added to an alkaline leaching solution containing tungsten (307 mmol L–1), sodium (1236 mmol L–1), and vanadium (1.7 mmol L–1), over 90% of the tungsten was rapidly recovered as a lysine–tungsten precipitate. The sodium in the precipitate was successfully removed by a simple washing process. Calcination was then performed to obtain 99.6% high-purity tungsten oxide, and reduction and carburization of the obtained tungsten oxide resulted in tungsten carbide. A pilot study using the CAAP method demonstrated a considerable decrease (60%) in the displacement (i.e., volume of chemicals used/waste created) compared with that required for the conventional ion-exchange method for tungsten recycling.

中文翻译:

碱性废料和带电荷的氨基基团辅助沉淀法回收和回收钨

本文中,我们提出一种带电荷的氨基辅助沉淀(CAAP)方法,用于从通过硬质合金(WC-Co合金)废料的碱浸获得的溶液中回收和回收高纯度钨。将含有带电荷的氨基(NH 3 +)的赖氨酸盐酸盐添加到含钨(307 mmol L –1),钠(1236 mmol L –1)和钒(1.7 mmol L –1)的碱性浸提溶液中时),超过90%的钨以赖氨酸-钨沉淀物的形式被快速回收。通过简单的洗涤过程成功去除了沉淀物中的钠。然后进行煅烧以获得99.6%的高纯度氧化钨,并且所获得的氧化钨的还原和渗碳产生碳化钨。使用CAAP方法进行的一项初步研究表明,与传统的钨回收离子交换方法相比,位移(即所用化学物质/产生的废物的量)显着减少(60%)。
更新日期:2018-01-19
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