Abstract: A process for recovering gold from a refractory gold ore, comprising the steps of: electrolyzing a mixture consisting of the ore particles and an aqueous bromide solution in an electrolytic cell having anode and cathode, wherein bromine is produced at the anode by oxidation of the bromide, thereby dissolving gold in the aqueous phase; separating the ore particles from the aqueous phase to obtain a leach liquor; adjusting the pH of the leach liquor to the alkaline range to produce a gold-containing precipitate; collecting the gold-containing precipitate and recycling a bromide-containing barren solution for reuse as an aqueous bromide feed solution.

Abstract: The invention relates to a method for treating emergency spill or leak of halogen which is bromine or chlorine, comprising contacting an aqueous solution of quaternary ammonium halide with the halogen.

Abstract: The invention relates to a method for treating emergency spill or leak of halogen which is bromine or chlorine, comprising contacting an aqueous solution of quaternary ammonium halide with the halogen.

Abstract: A process for recovering gold from a refractory gold ore, comprising the steps of: electrolyzing a mixture consisting of the ore particles and an aqueous bromide solution in an electrolytic cell having anode and cathode, wherein bromine is produced at the anode by oxidation of the bromide, thereby dissolving gold in the aqueous phase; separating the ore particles from the aqueous phase to obtain a leach liquor; adjusting the pH of the leach liquor to the alkaline range to produce a gold-containing precipitate; collecting the gold-containing precipitate and recycling a bromide-containing barren solution for reuse as an aqueous bromide feed solution.

Abstract: The invention relates to a method of operating a zinc-bromine battery, especially at a high temperature, comprising adding 1-n-butyl-2-methyl-pyridinium bromide to the electrolyte of said battery, and charging or discharging said cell. Also provided is the use of 1-n-butyl-2-methyl-pyridinium bromide as an additive in a zinc-bromine battery operating at a temperature above 30° C., and an aqueous concentrate with high content of 1-n-butyl-2-methyl-pyridinium bromide.

Abstract: The invention relates to a method of operating a zinc-bromine battery, especially at a high temperature, comprising adding 1-n-butyl-2-methyl-pyridinium bromide to the electrolyte of said battery, and charging or discharging said cell. Also provided is the use of 1-n-butyl-2-methyl-pyridinium bromide as an additive in a zinc-bromine battery operating at a temperature above 30° C., and an aqueous concentrate with high content of 1-n-butyl-2-methyl-pyridinium bromide.

Abstract: A lithium ion secondary battery comprising: (i) a cathode comprising a cathode active material that can reversibly oclude and release lithium ions wherein the upper cut-off voltage for the cathode during charging against Li/Li+ is of at least 4.4 V, preferably of at least 4.5 V and more preferred of at least 4.6 V; (ii) an anode comprising an anode active material selected from silicon; and (iii) a non-aqueous electrolyte comprising at least one lithium salt and at least one non-aqueous organic solvent selected from fluorinated carbonates.

Abstract: The present invention relates to an electrode material for an electrical cell comprising activated carbon fibers as component (A) which have been impregnated with elemental sulfur as component (B). The present invention further relates to rechargeable electrical cells comprising at least one electrode which has been produced from or using the inventive electrode material and to a process for producing said inventive electrode material.