Sparging into a slurry
Sparging into a slurry
(OP)
What are the difficulties in sparging air into the cyanide detoxification (INCO) process,
CN- + H2O + O2 + SO2 -> OCN- + H2SO4 ?
Typically the "substrate" is some kind of slurry ... how does this affect sparger selection? That is, the tank is vigorously agitated, so does the sparger have special material to protect against erosion? Do you think it's possible to use a fused metal sparger for this application, or will it be rather rapidly eronded? What about the tank walls? In a typical application, what do you think the apparent density of the fluid is?
CN- + H2O + O2 + SO2 -> OCN- + H2SO4 ?
Typically the "substrate" is some kind of slurry ... how does this affect sparger selection? That is, the tank is vigorously agitated, so does the sparger have special material to protect against erosion? Do you think it's possible to use a fused metal sparger for this application, or will it be rather rapidly eronded? What about the tank walls? In a typical application, what do you think the apparent density of the fluid is?





RE: Sparging into a slurry
Some chemical to improve O2 uptake into this slurry may be required before you can see the benefit of increasing turbulence / agitation to enable this reaction to approach equilibrium.
RE: Sparging into a slurry
However, this reaction is usually done on such a grand scale that an uptake chemical (Are you thinking of something like iron, when I've got a solution of cyanide?) would be prohibited by cost. The Cu(II) works because it's usually already in the slurry.
And it is well known that the turbulence and agitation of the solution assists in O2 uptake: as O2 is consumed by the reaction, more is taken up, so long as the gas film layer and the liquid film layers can be thinned through agitation.
So this is a really old reaction and pretty well-understood. Any idea about spargers in a severely agitated slurry?
RE: Sparging into a slurry
In my days as an operations engineer at an ASU, a manual method for O2 purity estimation was to bubble O2 into an ammonical solution of CuSO4 to produce cuprammonium hydroxide( may perhaps work just as well with NaOH?). But this solution you have is acidic, and O2 partial press is very low also..
RE: Sparging into a slurry
RE: Sparging into a slurry