Humic Superphosphates Based On Phosphorites And Oxidized Local Coal
The article presents the results of a study of the processes of obtaining humic superphosphates by decomposing enriched phosphorites of the Central Kyzyl Kum: washed burnt concentrate, washed dried concentrate, ordinary phosmuki powder with sulfuric acid and the addition of oxidized coal from the Angren field with hydrogen peroxide. It was found that the addition of oxidized coal to an acidic superphosphate mass before ammoniation and drying leads to neither a decrease as usually occurs when superphosphate is obtained by decomposition of phosphorites with sulfuric acid followed by ammoniation and drying, but to a significant increase in the relative content of assimilated forms of P2O5. The optimum norm (60%) of sulfuric acid and the weight ratio of phosphorite to oxidized coal (1: 0.25) were found. Highly effective humic superphosphates are obtained from all types of raw materials, even as poor as ordinary phosmuk.