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 Processing & Handling

An economical way to extract more alumina from bauxite

By Chemical Engineering |

Alumina refining by the Bayer process involves the digestion of bauxite ore with caustic soda, which produces “green liquor,” from which alumina is recovered, and a bauxite residue, called red mud, which is stored in large disposal areas. A typical refinery (2-million m.t./yr) produces about 1.4 tons of bauxite-residue per ton of alumina recovered, which translates into about 2.8-million m.t./yr of red mud having to be disposed. Therefore, efforts have been underway to develop new processes to extract more alumina from bauxite residue, thereby reducing the volume generated. A step in this direction is the M2M-Technology (mud-to-money) process, which was developed by Alcor Technology B.V. (Oegstegeest; edlinks.chemengonline.com/6898-538) and Alfa Laval Benelux B.V. (ALB; Breda, both Netherlands; edlinks.chemengonline.com/6898-539). M2M-Technology is a patented combination of well-known re-digestion and spiral heat-exchanger (SHE) technology. The second digestion step is inserted in the transfer line between decanter underflow and the first washer (flowsheet). The first digester is used to maximize the liquor A/C ratio (alumina-to-caustic concentration), while the second digester serves to maximize alumina extraction from…
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