COMPOUND POTASSIUM HUMATE BY HYDROTHERMAL SYNTHESIS FROM BIOMASS AND LIGNITE AND ITS APPLICATION

Liu Wenna; Li Yanling; Dong Lijing; Liu Peng; Sun Tanglei; Lei Tingzhou

doi:10.19912/j.0254-0096.tynxb.2024-2106

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 448-459. DOI: 10.19912/j.0254-0096.tynxb.2024-2106

COMPOUND POTASSIUM HUMATE BY HYDROTHERMAL SYNTHESIS FROM BIOMASS AND LIGNITE AND ITS APPLICATION

Liu Wenna¹, Li Yanling¹, Dong Lijing², Liu Peng¹, Sun Tanglei¹, Lei Tingzhou¹

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Abstract

Compound potassium humate （MIXKHA）, synthesized from biomass and lignite under a biochemical/mineral binary system, is a high-potential green organic fertilizer with the advantages of both mineral potassium humate and biochemical potassium humate. In order to explore the synergistic effect between biomass and lignite and the effect of raw material ratio on the formation of MIXKHA during co-hydrothermal process, Baoqing lignite （BL） and chestnut shell （CS） were hated in KOH solution to synthesis mineral potassium humate （BLKHA）, biochemical potassium humate （CSKHA） and MIXKHA with different raw material ratios （3∶1- 1∶3）. FTIR and ¹³C NMR were used to analyze the structural changes of BL and CS after hydrothermal processes, and the effects of MIXKHA on plant growth and quality were studied using Chinese chive pot experiments. The results show that, compared with BLKHA, MIXKHA_1∶1 is with lower aromaticity, more oxygen-containing functional groups, rich fat branched chains, carboxyl groups, phenolic hydroxyl groups, and higher activity. The co-hydrothermal of BL and CS have a positive synergistic effect on the yield of MIXKHA （+0.23%-1.32%） and an increase in HA content in MIXKHA （+0.09%-18.92%）. The change in the raw material ratio has a significant effect on the MIXKHA yield （67.35%-77.41%） and HA content （41.17%-79.14%）. The MIXKHA yield and HA content increased with an increase in BL ratio, and the K₂O content in MIXKHA is less affected by the raw material ratio （21.31%-26.83%） increase with an increase in the CS ratio. When BL and CS are mixed in a ratio of 2∶1, the synergistic effect is the strongest. MIXKHA_2∶1 yield （76.60%） and HA content （79.08%） are apparently higher than theoretical values. MIXKHA_2∶1 could meet the first-class product standard in GB/T 33804—2017 potassium humate for agricultural use. When applied as organic fertilizer in a pot experiment, MIXKHA_2∶1 can improve the quality of Chinese chives while promoting the development of Chinese chives leaf stems and root growth, which is an efficient and eco-friendly organic potassium fertilizer. Moreover, the synthesis and application of MIXKHA broadens the way for the high-value utilization of lignite and biomass.

Key words

biomass / lignite / hydrothermal synthesis / potassium humate / high-value utilization / pot experiment / organic potasslum fertilzer

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Liu Wenna, Li Yanling, Dong Lijing, Liu Peng, Sun Tanglei, Lei Tingzhou. COMPOUND POTASSIUM HUMATE BY HYDROTHERMAL SYNTHESIS FROM BIOMASS AND LIGNITE AND ITS APPLICATION[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 448-459 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2106

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