RECYCLING SLAG FROM COMBUSTION OF MSW INTO COMPLEX MINERAL FERTILIZERS USING POOR PHOSPHORITE

Abstract

The article deals with the issue of secondary recycling municipal solid waste (MSW) into complex mineral fertilizers using domestic agricultural raw materials. Used in the recycling were slag from combustion of MSW and poor phosphorite. The nature of the decomposition of phosphorite 50-80% acid H2SO4 was studied at an acid consumption rate of 60-110%, of the consumption rate of acid H2SO4, which made it possible to identify optimal conditions used also for recycling binary raw materials. The increase in the content of assimilable Р2О5 has been uncovered in the liquid phase during the recycling binary raw materials in comparison with the decomposition of phosphorite under similar conditions. The role of MSW of slag in increasing the content of assimilable Р2О5 due to the improvement of conditions for the diffusion of molecules of the formed phosphoric acid to phosphorite particles is explained. The possibility of regulating the characteristics of the obtained complex mineral fertilizers by the ratio of the components of raw materials is shown.