The commonly used process for extracting bauxite is the Bayer process
The project team which also includes the CSIRO, ETH Zurich, Hatch, IT Power, UNSW and the San Diego State University aims to develop the technologies and process knowledge to progressively integrate low temperature CST, solar reforming of natural gas, and high temperature CST into the existing Bayer process
Billions of tonnes of this "red mud" sit in holding ponds around the world, an amount that will continue to increase as long as the Bayer process
These include the formation of anionic polyacrylamide through hydrolysis, (17) the synthesis of sulfomethylated derivatives from the reaction of polyacrylamide with formaldehyde and sodium bisulfate, (18) the formation of aminomethylated polyacrylamide from the reaction of polyacrylamide with formaldehyde and dimethylamine (Mannich reaction), (19) and the generation of various derivatives by transamidation reactions including hydroxamated polyacrylamides used as a flocculant in the Bayer process
For metal grade bauxite the aluminum content should be more than 40% and for chemical grade it may above 60% while most Bayer process
plants use bauxite having alumina content greater than 40% however all the technical factors from mining to marketing are to be considered .
The Bayer process
, which refines bauxite to produce alumina (aluminum oxide), generates a significant waste stream.
The available alumina and reactive silica results quoted are unbeneficiated based on low temperature caustic digest analysis (143AC), to simulate extraction by the Bayer process
He explained the improved Bayer process
step by step: identified a market problem, formed an economic value proposition and solicited feedback about the value proposition from parties throughout the value chain.
From the data obtained in this study, it may be safely said that bauxite of this area is suitable for extraction of aluminum by a small size Bayer Process
Plant having annual feed of 1.
Stamixco LLC says the Bayer process
also allows the mixers to be made and sold at lower cost.
The Bayer process
uses caustic soda to digest the ore and solubulize the alumina from the bauxite as sodium aluminate.
Life Cycle Assessment of China's Alumina Manufacturing by Bayer Process