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Joe666: regarding "Hate to burst any bubbles here but cut and pasting science blurb doesn’t make you a chemical engineer." - my bubble's OK thank you - my first degree was applied chemistry and for 16 years I worked for the Central Electricity Generating Board as an engineer... perhaps you meant this for DP?
Chinasyndrome
The elephants in the room are first production recovery rates of which the best quote I have seen on a gypsum stack is 70% which represents only 1/3 of the alternative sector and varies on source of stack. This identifies the second elephant in that 85-90% of market will need to be supplied by existing and planned new mining capacity. At best gypsum stacks and other recycling sources can only deliver at best a fraction of global supply needs. Finally, if anyone thinks customers will accept sub-standard overpriced products will gain market acceptance for not using rare earth products with naff replacements instead will meet with market failure, as reliability and quality has a productivity value. Tony
Yes the technology might exist, BUT as with the bacterial leaching of Gold which has been around for at least 30 years there are problems that do not make it attractive. Breeding bugs is very environmentally dependent, a temperature difference of 1-2 degrees cuts propagation rates 90%, they are great at extracting low concentrations but put them in a rich ore and they get stuffed and go to sleep. Then there is the cost of mining the heaps and rehabilitating them once depleted ~ as the ionic clay boys are finding out you need to recover enough "Value" out of those low concentrations to pay for the whole exercise. Also you have to ask, of that 0.1%TREE what percentage is NdPr ? if they are lucky there could be 40%. Then consider that Fly Ash already has a commercial use / value ~ ie as a partial substitute for Cement and as a sub-base stabilizer for foundations.
Considering all of the above I doubt if it will become a commercially preferable source of NdPr for many many years !
Hate to burst any bubbles here but cut and pasting science blurb doesn’t make you a chemical engineer. Pensana have arguably the best and definitely the most experienced rare earth specialist metallurgist outside of China who is handpicking a team to perfect the complex processes required to get from ore to oxide. Don’t expect this work to be published for obvious reasons.
Dumbpunter is nothing but a common troll that revels in negative feedback. He owns no PRE shares yet the majority of his posts are about PRE. He is a needy, no mark, low achieving keyboard warrior who no-one takes seriously in the real world hence his desire for recognition on here. He is incapable of not posting on here as it is hardwired into him to seek negative attention - a bit like a moth to a flame - totally self defeating but he is unable to control himself. It can be traced back to his childhood so we really should feel sorry for him.
You watch. Any normal person would read this and think, he has a point, I'll stop. Not Dumbpunter though, he will continue to post pointless negative nonsense with no purpose other than his unconscious desire for the gratification he receives from the negative feedback. Really sad, but true.
Hogsnipe, very interesting, but I'm not sure that's going to reduce any anxiety levels; if the method you describe is viable, doesn't it risk rendering Longonjo obsolete? The all in cost of processing fuel ash would presumably be far lower than that of full scale mining.
Think you mite have posted on the wrong company forum DP , Would suggest you spend a bit more time and effort on your part getting these basic tasks done correctly and sharing your content with holders of that stock , This cry for attention on the PRE forum now is quite embarrassing and showing complete ignorance on your behalf.
As a diversion from worrying about PRE takeovers, have a look here:
https://cen.acs.org/analytical-chemistry/separations/Protein-unlock-new-sources-rare-earth-elements/99/web/2021/10
Earlier posts talked about the potential to recycle Nd and Pr from coal-fired power station fuel ash heaps and ponds, of which there is no shortage in UK. This required a complex ionic liquid solvent extraction process, but a couple of US universities have developed a more efficient, more selective and more environmentally friendly technique. The active agent is lanmodulin - a protein found in naturally-occurring methane-digesting bacteria - how eco can you get?. Initial trials show that this protein is amazingly efficient at binding with Nd and Pr and lends itself well to a contiuous column extraction process, and can be easily tweaked to separate light from heavy rare earth metals, and even to separate Nd from Pr, each at very high purity. The columns can be flushed and re-used for many cycles as can the acidic carrier solution.
Starting with an acidic leach of fuels ash containing about 0.1% mixed RE metals content, only a few cycles produced separated metals recovering 80% of all RE metals from the leach, each with >99% purity.
The simplicity of this approach, the ability to run it as a continuous extraction process, and the low environmental/re-use emphasis should certainly attract Pensana to look deeper into it.