Authors: K.S. Votolin, S.I. Zherebtsov, O.V. Smotrina, IsmagilovZ.R.

Title of the article: Optimization of composition and operating modes for receiving complex granular humic fertilizers

Year: 2018, Issue: 2, Pages: 127-133

Branch of knowledge: Chemical technology

Index UDK: 661.152.4

DOI: 10.26730/1999-4125-2018-2-127-133

Abstract: The data on search of optimum compoundings and operating modes of the equipment for receiving the complex granular humic fertilizers (CHF) having the increased static strength and the slow-release effect of the humic substances (HS) are presented. Search of optimum compoundings of CHF was carried out by means of the technique of mathematical designing of an experiment. Variation of the parameters of CHF preparation was set according to the values of the three-factorial matrix of designing the second-order experiment of Box-Draper (B–D23). The technique of determination of static strength of granules is described by a crush method. The adequate (at significance level α=0.05) regression equation of an average ultimate load was obtained from the value of factors of CHF preparation: concentration of liquid HumNa, amounts of carboxymethylcellulose (CMC) and temperature of granule drying. Static strength of granules depends mainly on temperature of drying and the amounts of CMC. Additional introduction of liquid HumNa poorly influences the static strength of granules. The technique of assessment of the slow-release effect of the humic acids (HA) in the conditions close to real (field) is proposed. The process of HS release from of the strongest sample of CHF lasts 152 days and more.

Key words: Brown coal complex granular humic fertilizers static strength of granules slow-release fertilizer

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