Abstract: A method and apparatus are disclosed for pneumatically controlling the velocity of flow of liquid metal from a tundish into a continuous casting machine through a nozzle. A chamber encloses the nozzle outlet, and at least a portion of the continuous casting machine, and a pressurized gas is supplied to the chamber. The flow velocity of the liquid metal at the nozzle outlet is controlled by controlling the gas pressure in the chamber in response to the level of the liquid metal in the tundish, and the measured atmospheric pressure acting on the liquid metal in the tundish.

Abstract: A novel bioadsorption composition suitable for removing heavy metal from waster water effluent, the composition comprising a biomass encapsulated sol-gel matrix. A process for preparing the biomass encapsulated sol-gel matrix is also provided. The bioadsorption composition may be suitably used to remove a substantial amount heavy metal (such as uranium) from a waste water effluent, particularly a dilute aqueous stream comprising a waste water effluent (such as mine water). Heavy metal may then be recovered from the bioadsorption composition, thereby rendering the latter as reusable.