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Applied Sciences OPEN ACCESS

Sulphuric Acid Co-Processing of Central Kyzylkum Phosphorite Slime with Activated Sludge: Distribution of Humic Substances and Nutrients Between Liquid and Solid Organomineral Fertilizers

Mukhammatova Umida Khusan qizi
Basic Doctoral Student (PhD), Department of Chemical Technology, Navoi State University of Mining and Technologies, Navoi, Uzbekistan
Temirov Uktam Shavkatovich
Professor, DSc, Department of Agronomy, Navoi State University of Mining and Technologies, Navoi, Uzbekistan
Sharipov Sanat Shuhrat ugli
Associate Professor, DSc, Dean of the Faculty of Chemistry and metallurgy, Navoi State University of Mining and Technologies, Navoi, Uzbekistan
DOI Crossref DOI 10.37547/tajas/Volume08Issue01-13
tajas 2026
VOL. 8 / NO. 01 JANUARY
FULL TEXT PP. 135-139
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VOLUME 8
ISSUE 01
YEAR 2026
PAGES 135-139
RESEARCH OVERVIEW

Abstract

Phosphorite slime (FSh) from Central Kyzylkum ore beneficiation was co-processed with municipal activated sludge (FL) into liquid and solid organomineral fertilizers (OMF). Mixtures containing 10- 80 wt.% FL were decomposed with 30 % H2SO4 at 50- 90 % of the stoichiometric acid demand of CaO and separated by vacuum filtration. The slime controlled P2O5 and CaO, whereas organic matter, humic acids (HA), fulvic acids (FA) and K2O followed the sludge share; the FA:HA ratio of the slurry (2.42- 2.44) equalled that of the sludge. On filtration, FA and water-soluble organic matter passed mainly into the filtrate, while 88.9- 95.3 % of HA and 86.0- 91.9 % of CaO remained in the cake. At FSh:FL = 60:40, raising the acid norm from 50 to 80 % increased P2O5 transfer to the liquid from 37.1 to 50.0 %. The process yields a fulvate-rich liquid fertilizer and a humic- and calcium-rich solid fertilizer.

RESEARCH TOPICS

Keywords

Phosphorite slime activated sludge sulphuric acid decomposition

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