Modern husbandry, medicine, industry, without the use of phosphorus unthinkable.
Is extracted phosphorus extraction of phosphoric acid from phosphate rock minerals and apatite.
Parallel to produce technogenic waste - phosphogypsum CaSO4 * 2H2O in the amount of 4.5-5.0 t per 1 ton of P2O5 (1,45 t H3PO4).
Depending on the place of origin of raw materials, phosphogypsum may contain harmful impurities strontium fluoride, uranium and other radioactive elements and heavy, costly impurities of rare earth elements (REE). Need economically profitable manner technology for processing any phosphogypsum.
Output expected global volume of consumption phosphorus (in P2O5) in 2015 is about 45 million t, hence the production of phosphogypsum - from 225 million. Tons per year. Besides technical gypsum as a waste product produced and is released into technological processes ferrous and nonferrous metallurgy, thermal power plants scrubber.
FIG. 1. Waste Voskresensky chemical plant,
Today in the World of billions of tons of man-made waste are in the open air and in the mines by producing a negative impact on the environment.
Around the world for the disposal of this waste of man-made charge a fee, which increases the cost of production of phosphoric acid.
Feeble attempts to
combat this technogenic waste in the form of fines and taxes (up to € 30 / t in
The original technology
will allow to receive marketable products from the economic an efficiency of
about $ 200, and in some cases, at presence in the dumps raw of processing of
There are positive examples of
processing calcium sulfate obtained as a result flue gas desulfurization in thermal
power plants to give the US fertilizer - ammonium sulfate (NH4)2SO4.
We propose to strengthen the success
of the resulting increase in the yield significantly.
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