Poly(methylene blue) modi®ed electrodes have been prepared by potential cycling from aqueous electrolyte solution containing methylene blue on glassy carbon substrates. They have been used successfully for the determination of haemoglobin via its electrooxidation at ®xed potential using the batch injection analysis technique in which whole blood samples diluted with phosphate or acetate buffer ...

Fine grinding mills have improved in design and efficiency in recent years, allowing major opportunities for treatment of materials where liberation to grind sizes below fifteen microns are required. The successful development of the IsaMill, a horizontal stirred mill, has produced equipment capable of grinding the larger tonnages which exist in mineral processing operations, to product sizes b...

 Cyanidation is a relatively simple and cheap technology to treat gold-containing ores. However, this process is not completely effective in refractory gold-bearing sulfide ores. In the case of very low-grade ores, biooxidation is an attractive alternative pre-treatment to render the gold amenable to extraction. This process utilizes the ability of acidophilic bacteria to oxidize the sulfide m...

In the process of cyanidation gold concentrate from a smelting company, content copper and zinc in liquid gradually increased. production, acidizing is used to treat lean solution high concentrate, mixed products containing copper, other metals are produced. this paper, pH value precipitation 6.0 3.0 through theoretical calculation experiment. The separation realized successfully. product with ...

The implementation of more stringent regulations and the recent development of the International Cyanide Management Code (ICMC) by the industry is aimed at avoiding future environment incidents with cyanidation plants. To meet the ICMC discharge to tailings requirements and/or regulations, many operations now adopt cyanide recovery or destruction processes. In Australia, there is also the repor...

Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve yields and reduce chemical consumption during cyanidation. In this study, effect initial cell concentration on oxidation pyritic ore was evaluated with four aerated bioreactors 30 °C 10% pulp density pH maintained 1.4 NaOH. Results NaOH changes in soluble Fe S concentrations...