Effect of physical pre-enrichment on humic substance recovery from leonardite
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Dumlupinar University, Department of Mining Engineering
Publication date: 2016-12-01
Corresponding author
Cengiz Karaguzel   

Mining Engineering Department, Dumlupınar University, DPU Müh. Fak. Maden Müh. Böl., Evliya Çelebi Yerleşkesi, 43270 Kütahya, Turkey
Physicochem. Probl. Miner. Process. 2017;53(1):502-514
Leonardite mineraloid is known as a highly oxidized ore formed during carbonisation process of lignite containing humic substance. Humic substance is an organic material containing fulvic acid, humic acid, and humin, and that is mostly used as soil conditioner. Extraction of humic substances from leonardite ores that contain high amounts of humic acid (>50%) has become a prominent area of study in recent years. While humic substance extraction from leonardite is generally carried out by chemical dissolution technique (leaching) in alkali medium, physical enrichment methods were also used in limited number of studies. However, removing inorganics found in leonardites would decrease dissolving reactive consumption and would also prevent unnecessary capacity use. This study investigates the effect of physical pre-enrichment processes on humic substance leaching. This research was carried out in two stages. In the first stage, operational parameters such as amount of reactive, stirring time, temperature, and solid ratio for the leach process were studied, and the most suitable leach conditions were then determined. In the second stage, the effect of physical pre-enrichment experiments on leach process was investigated. While a product containing 48.2% humic substance was obtained with 87.63% humic substance extraction efficiency through chemical enrichment experiments, a product containing 62.74% humic substance (concentrate) was obtained with 92.4% humic substance extraction efficiency after pre-enrichment combined with leach processes.
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