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Process to recover metal by alkaline leaching

A catalyst and metal technology, applied in the field of aluminum oxide products

Inactive Publication Date: 2005-02-02
SHELL OIL CO
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  • Abstract
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AI Technical Summary

Problems solved by technology

Some metal sulfides are readily oxidized in air at room temperature, but others may require elevated temperature and oxygen pressure to oxidize

Method used

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Embodiment Construction

[0022] The present invention is a method of recovering metals from spent petroleum refinery catalysts without dissolving significant amounts of the catalyst matrix. Various catalyst sources can be used in this process; one commonality of the catalysts is that they are prepared from alumina, alumina-silica or silica-alumina supports. Without limiting the scope of the invention, the process is described as an example of a petroleum processing catalyst and, for the sake of simplicity, in particular a mixture of petroleum catalysts based on aluminum oxide (hydroprocessing catalysts) such as residue / HDS Raw materials, the main metals vanadium (V), nickel (Ni), cobalt (Co) and molybdenum (Mo) or tungsten (W) in the form of metal sulfides, are illustrated as examples. The process of the present invention dissolves the metal sulfides into solution while maintaining most of the alumina as a solid.

[0023] The amount of metal in the form of metal sulfides in various catalyst sources i...

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Abstract

There is provided a process to reclaim molybdenum, vanadium and other hydrodesulfurisation metals from catalysts, said process comprising collecting one or more catalysts containing at least one metal sulfide; leaching the catalyst in an atmospheric alkaline leach step; separating the leached slurry into a first liquid stream and a first solid; leaching the first solid in a caustic pressure leach process; separating the second leached slurry into a second liquid stream and a second solid; collecting the first and second liquid streams; oxidizing the combined liquid stream; cooling the oxidized liquid stream; adjusting the pH of the oxidized liquid stream; contacting the cooled oxidized liquid stream with an organic solvent containing an extractant; stripping the soluble metal species from the organic phase; adjusting the pH of the aqueous phase to selectively precipitate at least one metal as a metal salt; and separating the metal salt from the aqueous phase.

Description

technical field [0001] This invention relates to a process for recovering products from spent catalysts, in particular recovering and regenerating metals, oil, and fuel-rich alumina products from petroleum processing catalysts. Background technique [0002] Petroleum hydrocarbons (oil) in and on spent catalysts are believed to hinder the economics of metals recovery. Oil present on the catalyst blocks the catalyst pores and requires more severe conditions to oxidize the surface metal by hydrometallurgical oxidation. Furthermore, the oil also leads to undesirable organic contamination during the leaching process and in the recovered product. Common methods of catalyst degreasing such as thermal degreasing or roasting are unsatisfactory, resulting in reaction of aluminum oxide with metal at high temperature and ultimately reduced metal yield. [0003] The metals to be regenerated are usually recovered after removal of the petroleum coke produced in use. Coking of hydroproce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B7/00C22B34/22C22B34/32C22B34/34
CPCC22B7/008C22B7/009C22B34/345C22B34/325Y02P10/20C22B34/34
Inventor J·T·维尔K·A·安德森R·M·克瓦莱斯基
Owner SHELL OIL CO
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