Conclusions
Thermochemical synthesis offers possibility of getting effective compound fertilizers from low-grade poorly enrichable mineral raw materials. Agricultural field tests demonstrated that the compound fertilizers developed are much more effective than equivalent doses of the starting components equalized in terms of nitrogen and potassium.
Consequently, apatite-based compound fertilizers can be used to radically improve soil fertility (phosphoritization with simultaneous improvement of the nitrogen-potassium regime).
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References
K. A. Nikiforov, Physicochemical Principles of Integrated Treatment of Lean and Poorly Enrichable Ores [in Russian], Nauka, Novosibirsk (1984).
A. S. Latkin, L. A. Samatova, and E. B. Shevkun, Inventor’s Certificate No. 1664772: Method of Producing Compound Phosphate Fertilizers [in Russian], Published in Byull. Izobret., No. 27 (1991).
A. S. Latkin, Scientific and Technological Principles of Raising Efficiency of Treatment of Disperse Minerals Based on Vortex Apparatuses, Doctor’s Dissertation [in Russian], Khabarovsk (1995).
L. A. Samatova, L. A. Kienko, N. P. Ozeran, and L. N. Shchukina, "Problems of integrated utilization of minerals from the Far East," in: Integrated Utilization of Minerals from the Far East [in Russian], Far Eastern Branch of the Academy of Sciences of the USSR, Vladivostok (1989).
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Research Center of the Far Eastern Branch of the Russian Academy of Sciences, Petropavovsk-Kamchatskii. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, Vol. 34, No. 1, pp. 118–122, January–February 1998.
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Latkin, A.S., Samatova, L.A. Thermochemical methods of treatment of low-grade phosphatic raw materials. J Min Sci 34, 97–100 (1998). https://doi.org/10.1007/BF02765531
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DOI: https://doi.org/10.1007/BF02765531