Problems and prospects of usage of secondary products of processing of natural phosphates for construction materials

Abstract

In the article the problems and prospects of using of secondary products of processing of natural phosphates for obtaining building materials. This technology for production of complex fertilizers is carried out on a Chemical enterprises in Russia: Veliky Novgorod, Dorogouge and Kirovo-Chepetsk. It is noted that from 1 ton of P2O5 of apatite it is produced of CaCO3 about 80 kg. Total output of manmade chalk if you use apatite concentrate represented 896 thousand ton and does not solve the problem of the shortfall of cement in Russia technogenic raw materials, in addition, all obtained in this process, liquid wastes and solid by-products are utilized within these companies without reference to the construction industry. To use the maximum amount of phosphogypsum waste produced by the best Perera-motivate on the spot in sulphuric acid, the who-rotated in the manufacturing associated with obtaining cement, sinter for road construction or lime (depending on the needs of the market). According to classical method on 1 ton of 100% sulfuric acid and 1 ton port lancement spent 2.05 ton hosphogypsum (in terms of dry dihydrate).