Plasma Induced Fuming
AssigneeValeas Recycling AB
InventorsMatej Imris, Sven Santén, Bror Magnus Heegard
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Abstract
A method for recovery of evaporable substances comprises melting (210) of a material comprising evaporable metals and/or evaporable metal compounds into a molten slag. The molten slag is agitated (212) by a submerged jet of hot gas. The hot gas is controlled (214) to have an enthalpy of at least 200 MJ/kmol, and preferably at least 300 MJ/kmol. At least a part of the evaporable metals and/or evaporable metal compounds are fumed off (216) from the molten slag. An arrangement for the method is based on a furnace with a plasma torch submerged into molten slag in the furnace.
Claims34
1-27. (canceled)
A method for recovery of evaporable substances, comprising the steps of:
- melting a material comprising at least one of evaporable metals and evaporable metal compounds into a molten slag;
- agitating said molten slag by a submerged jet of hot gas;
- fuming off at least a part of said at least one of evaporable metals and evaporable metal compounds from said molten slag;
- and
- controlling said hot gas to have an enthalpy of at least 200 MJ/kmol, preferably at least 300 MJ/kmol.
An arrangement for recovery of evaporable substances, comprising:
- a furnace;
- heating arrangement arranged for melting a material comprising at least one of evaporable metals and evaporable metal compounds in said furnace into a molten slag;
- a plasma torch system submerged via a tuyere into said molten slag and arranged for agitating said molten slag by a submerged jet of hot gas;
- and
- a fume handling system configured to collecting said at least one of evaporable metals and evaporable metal compounds being fuming off from said molten slag;
- said plasma torch system is designed to be operated to give said hot gas an enthalpy of at least 200 MJ/kmol, preferably at least 300 MJ/kmol.
Dependencies are inferred from the claim text.