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5. Recycling phosphogypsum.

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, Moscow Region, Russia. http://www.youtube.com/watch?v=jfMoEle0J2o

In Russia, acting ammofosnyh productions in all the years of their functioning has accumulated more than 500 million. t of phosphogypsum. Stocks of phosphogypsum in Uzbekistan represent more than 80 million. t and cover an area of 500 hectares. In Ukraine (Armenian, Sumy, Rivne) - more than 20 million. t. In Belarus - more than 20 million. t.

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 Europe) place an additional burden on consumers, but to save the nature of the effect does not work. We offer cost effective method of processing phosphogypsum.

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 apatite of Kola Peninsula sufficient amount of rare earth elements (REE), and up to $ 900 per ton of processed phosphogypsum.

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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