I D
× COMMENTARYEDITOR'S PAGECOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
Nanofiltration Toray Industries, Inc. (Tokyo, Japan; www.toray.com) has created what…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More SHOW PREVIEWS

Comment Separation Processes

Recovering rhenium photochemically

By Tetsuo Satoh |

Professor Hisao Hori and his research group at Kanagawa University (Hiratsuka City, Japan; www.kanagawa-u.ac.jp) have reported what is said to be the first photo-induced recovery of rhenium from aqueous solutions — an achievement with implications for an inexpensive way to recycle this rare earth element. The method has been shown to recover almost 95 wt.% of Re from solution — much higher than the 40–60% recovery achieved by conventional ammonia-based solvent-extraction — and the method is simpler than ion-exchange processes. And unlike solvent-extraction methods, the new process generates no nitrogen-containing wastewater. Traditionally, rhenium is obtained by collecting perrhenate ions (ReO4–) in water from rhenium(VII) oxide (Re2O7) in molybdenite (molybdenum ore) roasting gas, then repeatedly recrystallizing it by means of heat concentration and cooling. The resulting precipitate is manufactured by igniting it in a H2 stream, but since ReO4– salts are readily soluble in water across the entire pH range, the collection rate is low and the energy costs are high. In the new process, 2-propanol and acetone is added to an aqueous solution containing ReO4– ions, and the solution simply irradiated with ultraviolet-visible…
Related Content

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
How separation processes profit from Industrial Internet of Things (IIoT) solutions
Up to 80% increased production rates in plastic recycling
Higher throughput and purity in sodium bicarbonate production with up to 15% less energy consumption
Help feeding nations with chemical filtering technologies
Not at the forefront of Industry 4.0?

View More

Live chat by BoldChat