Phosphogypsum Piles (Stacks)
Principal byproduct generated in production of phosphoric acid from phosphate rock. These piles may generate radioactive radon gas.
Source: Terms of the Environment ...
They are typical in igneous, volcanic, metamorphic, and granitic terrane as well as chemical sediments such as limestone, anhydrite and gypsum. Tubular springs are more typical in chemical sedimentary rock and from lava tubes in basalt flows.
karstian geology An area predominantly underlain by limestone, dolomite, or gypsum and characterized by rapid, underground drainage. Such areas often feature sinkholes, caverns, and sinking or disappearing creeks.
Certain chemical compounds containing phosphorus. Phosphor-gypsum Piles (Stacks) Principal by-product generated in production of phosphoric acid from phosphate rock. These piles may generate radioactive radon gas.
Phosphorus ...
(1) An alteration of the properties of a soil and thereby of the soil by the addition of substances such as lime, gypsum and sawdust to make the soil more suitable for the growth of plants. (2) Any substance used for this purpose.
In some areas the sulfates are sold to chemical companies as gypsum when the purity of calcium sulfate is high. In others, they are placed in a land-fill.
Desulphurisation
the removal of sulphur compounds from flue gas in the form of solid sulphur or as calcium sulphate (gypsum) ...
 See also: Solution, Nitrogen, Water, Gas, Liquid
  
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