Abstract: A method of treatment or purification of a molybdenum concentrate also containing copper, comprises the step of subjecting the molybdenum concentrate to pressure oxidation in the presence of oxygen and a feed solution containing copper (e.g. CuSO4) and halide (e.g. CuCl2) to produce a pressure oxidation solution containing copper and a solid residue containing molybdenum. The pressure oxidation solution may be combined with feed solution to a second pressure oxidation in which a copper concentrate is treated for the recovery of copper therefrom.

Abstract: A method of manufacturing a floor hockey puck comprises the steps of bonding a pair of felt discs together in a coaxial relationship by means of a flexible adhesive sandwiched between the discs to form a flexible core between the discs and applying a strip of protective material around the discs. In another embodiment, the discs are annular in shape and the strip of protective material is applied around the inner cylindrical sides of the discs.

Abstract: A floor hockey puck comprises a pair of felt discs bonded together by means of a flexible adhesive sandwiched between the discs forming a core which acts as a weight element to import sufficient weight to the puck to approximate the movement of an ice hockey puck on ice.

Abstract: A method of extracting a halide and sulphate from an aqueous sulphate solution, such as a zinc sulphate solution, comprises subjecting the solution to solvent extraction to extract halide and sulphate from the solution and controlling the amount of sulphate extracted by selective adjustment of the acidity of the aqueous solution.