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Class Information
Number: 423/157.5
Name: Chemistry of inorganic compounds > Treating mixture to obtain metal containing compound > Alkaline earth metal (mg, ca, sr, or ba) > Phosphorous or phosphorous compound containing waste as feed
Description: Processes wherein the mixture treated is a by-product or discarded product of another process.

Patents under this class:

Patent Number Title Of Patent Date Issued
6051196 Purification of phosphorus containing scheelite ore Apr. 18, 2000
5972073 Recovery of the components of group III-V material aqueous wastes Oct. 26, 1999
5518631 Dephosphorizing material and method of dephosphorization May. 21, 1996
5403565 Thorium phosphates prepared by insolubilization of soluble thorium compounds Apr. 4, 1995
4986977 Recovery of useful products from by-products of phosphate conversion coating process Jan. 22, 1991
4649035 Production of phosphorus and phosphoric acid Mar. 10, 1987
4605540 Low volatile fluorine process for making elemental phosphorus Aug. 12, 1986
4555388 Method and apparatus for calcining raw phosphate material Nov. 26, 1985
4537615 Fertilizer from phosphorus furnace waste stream Aug. 27, 1985
4474738 Process for mineral beneficiation Oct. 2, 1984
4472368 Neutralization of cooling pond water in phosphoric acid plants Sep. 18, 1984
4428915 Process for recovering phosphate values from precipitates formed during the neutralization of impure wet process phosphoric acid Jan. 31, 1984
4388292 Process for reducing radioactive contamination in phosphogypsum Jun. 14, 1983
4383847 Production of fluid fertilizer from phosphorus furnace waste stream May. 17, 1983
4175944 Removal of fluorine during production of fertilizer Nov. 27, 1979
4026990 Production of low-fluorine gypsum as a by-product in a phosphoric acid process May. 31, 1977
4017585 Fluid bed calcination process Apr. 12, 1977

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