Preparation method of phosphorylated lignin-based slow-release fertilizer capable of chelating trace elements

Abstract

The invention discloses a preparation method of phosphorylated lignin-based slow-release fertilizer capable of chelating trace elements. The preparation method includes: allowing lignin to have reaction with an animation reagent to prepare aminated lignin with slow-release performance, allowing the aminated lignin to have reaction with a phosphorylation reagent to prepare phosphorylated lignin with trace element chelating performance, fixedly loading nitrogen, phosphorus, potassium and the trace elements, adding auxiliary materials and bonding auxiliaries, and pelleting to obtain the phosphorylated lignin-based slow-release fertilizer capable of chelating the trace elements. The preparation method has the advantages that active groups such as amino groups and phosphate groups are introduced into lignin molecules, the amino groups and the phosphate groups are combined to achieve a synergic effect, chelating sites for chelating the trace elements and chelating strength are increased, and the lignin-based slow-release fertilizer is capable of chelating and slowly releasing micro-fertilizer; during the animation and phosphorylation of the lignin, the three-dimensional space network structure of the lignin is expanded, the loading capacity of the nitrogen, the phosphorus, the potassium and the trace elements is increased, and the steric-hindrance effect of the slow-release fertilizer is strengthened.

Description

[0001] Technical field: [0002] The invention relates to the technical field of biomass energy conversion and utilization, in particular to a preparation method of phosphorylated lignin-based slow-release fertilizer that chelates trace elements. [0003] Background technique: [0004] As the main component of lignocellulosic biomass, lignin is the main by-product of hydrolysis and fermentation of lignocellulosic biomass to produce ethanol and paper industry. Due to the complex structure of lignin, the utilization of lignin at this stage is mostly limited to low-value combustion to convert it into high value-added products. [0005] Chemical fertilizers have played a huge role in promoting the development of agriculture and play an important role in agricultural production. In recent years, my country's chemical fertilizer industry has developed rapidly, and the amount of chemical fertilizers used in farmland has increased year by year. However, high fertilizer application ra...

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Problems solved by technology

Such as CN102351598 discloses the preparation method of a kind of cross-linked lignin particle compound fertilizer based on hydroxymethylated lignin; CN103159532 discloses the preparation of a kind of porous lignin particle compound fertilizer based on methylol crosslinking and pore making Methods; in the existing research, there are few studies on the amination of lignin to slow and control the release of nitrogen fertilizer, and the combination of lignin phosphorylation to enhance its chelating micro-fertilizer performance