Rare metal collecting method using a single organic solvent that does not require waste liquid treatment of acid solution
With low environmental load that enables organic olvent recycling
Overview
For Japan, where the natural resources are poor, the technology to collect and
reuse rare metal is extremely important. In particular, with the increasing
demand for electric vehicle, the collection of rare metal from the cathode
material of lithium-ion battery has become a major industrial issue. Currently,
the collection is done by extracting each metal species with various solvents.
However, this method requires the waste liquid treatment of various acid
solutions generated during the collecting process.
This invention is about a rare metal collecting method using a single organic
solvent. The most important feature of this rare metal collecting method is that
the waste liquid treatment issue does not occur since it does not generate any
acid solutions, so it realizes a rare metal collecting process with low
environmental load. The right figure shows an example of the collecting device
of this invention. The acetylacetone vapor reacts with waste containing rare
metal to become an organometallic gas. The organometallic gas enters into the
separator then it is collected by metal species using the difference in boiling
point. The recovered organic metal is recycled in the form of metal or metal
compound through reactions such as hydrogen reduction, hydrolysis and
carbonation. In the mentioned reaction, acetylacetone is necessarily obtained
after the reaction, allowing the solvent to recycle.
Currently, 80% of the metal can be collected between the separator and the
collector.
Source: JST homepage
https://www.jst.go.jp/mirai/jp/uploads/saitaku2018/JPMJMI18C4_miki.pdf
Device schematic diagram and example of collected metal Co
Product Application
・Collect rare metal from cathode material of lithium-ion battery
・Collect rare metal from other waste containing rare metal
IP Data
IP No. ： JP7054536
Inventor ： SASAKI Yasushi, MIKI Takahiro
keyword ： Rare metal recycling