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Re: Case study on fertilizers

I wonder if mayhaps an HF producer could use the fluoride.  They 
burn fluorspar and sulfuric acid to make HF, if memory serves.  Just 
exactly what matrix does the waste fluoride occur in? 

Kirsten Sinclair Rosselot, P.E.
Process Profiles
P.O. Box 8264
Calabasas, CA 91372-8264


> I need some assistance.  I am looking for information, particularly a case
> study, of a fertilizer processor which has turned Fluoride from a waste
> product into a viable chemical.
> Scenario: The mineral Apatite is mined and processed to produce phospahte
> fertilizer.  Fluoride is a byproduct and conventionally is added to the
> solid waste pile of gypsum in gypsum stacks, or is scrubbed and emitted as
> an air pollutant.  With the advent of the Fluoride rules for fertilizer
> plants, we want to suggest an alternative process to reduce Fl air
> emissions and encourage production of Fl as a product.  (Fl is used in the
> electronics, aluminum extrusion and fertilizer! industries.)
> Any information you may have related to this request would be appreciated.
> Thank you.
> John A. Bernardo
> P2 Coordinator, Idaho DEQ
> 1410 N. Hilton
> Boise, ID  83706
> (208) 373-0114  phone
> (208) 373-0169 fax
> jbernard@deq.state.id.us