Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Spent Catalyst (2 replies)

2 years ago
dgt96 2 years ago

Hello, not sure which topic to ask this question in, but here it goes. Im selling some industrial spent catalysts and my client asked if the catalyst was "roasted" or "unroasted". I had never heard this terminology. Does anybody here has experience with this that might be of assistance? Thank you for your time.

2 years ago
SmartDog 2 years ago

You mention spent catalyst, this covers a very wide field and a very wide range of methods to produce the catalyst.  Taking one example of catalyst for hydrocarbon processing the material is usually made by calcining an aluminia oxide pellet that has been impregnated with other metals.  This calcining occurs at temperatures of around 2000 deg F (+/- a few hundred degrees).  While this is not technically a roasting process as the aim is to cause some fusion, where roasting is done at a significantly lower temperature, it is definitely not unroasted. 

2 years ago
Bhaduri 2 years ago

Spent catalyst from a refinery setting contains hydrocarbons in addition to spent metals, coke, alumina, silica, sulfur & a host of transition metal impurities. Once the shipment reaches a metals recycler, the hydrocarbons (oil) is desorbed & the relatively free flowing pellets are roasted in Rotary Kilns, Multiple Hearth furnaces or Fluid Bed roasters to oxidize the coke & combustible fractions. What discharges from this oxidation process is primarily metal oxides that may undergo hydrometallurgical separation and/or smelting.

So you might be selling spent catalyst to a recycler that has NOT been oxidized or roasted (refinery waste) general, the spent cat recycler will generate a roasted product. For more information, get a copy of the 2020 SME Mining Reference Handbook that contains details on the same and is written by yours truly.

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