Plant and method for recovering metals and/or metal oxides from industrial process waste, in particular refinery waste

Abstract

A plant (1) for recovering metals and/or metal oxides from industrial process waste, in particular oil product refining waste, comprises a furnace (2); a feed line (30) connected to a main inlet (12) of the furnace for feeding the furnace with a solid waste containing metals, in particular in oxide form; an outlet line (18), connected to a solid phase outlet (17) of the furnace for drawing a metal-enriched solid phase out of the furnace; the furnace is a belt conveyor furnace (2) having a belt conveyor (9) closed in a loop with a substantially horizontal configuration and having a top face (11), which receives the waste to treat and conveys it between two longitudinal opposite ends (7, 8) of the belt conveyor furnace (2) respectively provided with the main inlet (12) and the solid phase outlet (17).

Description

technical field [0001] The present invention relates to an apparatus and a method for recovering metals and / or metal oxides from industrial process waste, in particular waste from oil refining products (refinery waste). Background technique [0002] Various industrial processes produce waste materials containing metals (usually, but not exclusively, in the form of oxides). [0003] For example, various wastes from oil refining processes contain metals and metal oxides, such as inter alia: ash from gasification processes; ash from combustion processes of pet coke and / or heavy refining waste; Purge emissions from hydroconversion refining processes using by-products of slurry technologies, such as processes named: EST Slurry Technologies (ENI); VRSH Technologies (Chevron-Lummus-Global); HDH and HDHPLUS Technologies (Intevep) ; SRC-Unifex Technology (UOP); (HC)3 Technology (HeadWaters). [0004] Refining waste usually contains high concentrations of valuable heavy metals such ...

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Problems solved by technology

[0019] The recovery of molybdenum is also carried out by leaching of oxide mixtures using alkali or acid; in the case of molybdenum, recovery is much more complicated than in the case of vanadium alone, because the two metals and their compounds have similar properties, so their recovery and separation are difficult and require high-consuming chemicals; moreover, the separation of molybdenum from vanadium and other metals may require multiple stages of processing

[0020] Therefore, the recovery of molybdenum has similar problems to the recovery of vanadium alone, such as the presence of a large amount of carbon in the oxide and the chemical and physical characteristics (presence of agglomerates), which can make leaching difficult and expensive

However, the presence of molybdenum makes the recovery process and separation from vanadium more difficult, as solutions containing vanadium and molybdenum compounds with similar properties are usually obtained during leaching

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