Rice crop-residue-derived carbon-based slow release fertilizer coated by lignin-montmorillonoid- chitosan composite and preparation method thereof

Abstract

The invention discloses a rice crop-residue-derived carbon-based slow release fertilizer coated by lignin-montmorillonoid-chitosan composite and a preparation method thereof. The rice crop-residue-derived carbon-based slow release fertilizer is characterized by being prepared by drying and cutting rice straw and then feeding to a pyrolysis device; after pyrolysis, cooling to room temperature and acquiring biomass charcoal; adding distilled water in the alkali lignin, heating and mixing to acquire A component; adding copper sulfate solution in the montmorillonoid, mixing and acquiring the copper-containing montmorillonoid; adding acetic acid to the chitosan and preparing to be solution; adding glycerinum and mixing with A component and copper-containing montmorillonoid evenly; mixing starch and sodium hydroxide, adding de-ionized water; after water-bathing, heating and mixing at constant temperature, fully mixing with polyving akohol, borax and formaldehyde; reacting and acquiring the crosslinking enveloping liquid; smashing the biomass charcoal and urea by a smashing machine; sieving and mixing with kaoline, placing in a round disk pelletizer; after fully and evenly mixing, spraying the enveloping liquid by a sprayer to mix; after shaping, stopping pelletizing; drying until the constant weight; acquiring the biomass charcoal urea fertilizer.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a rice straw charcoal-based slow-release fertilizer coated with lignin-montmorillonite-chitosan and a preparation method thereof. Background technique [0002] Biomass charcoal is a solid product obtained by pyrolyzing biomass materials such as crop straws and sawdust under the environmental conditions of limiting or isolating oxygen. Due to the high ash content, the biochar prepared from crop stalks and other wastes is limited in the industrial field, but it can be widely used in the agricultural field. [0003] In Zhang Wei's master's degree thesis "Preparation and Performance Research of Rice Straw Charcoal-based Slow-release Fertilizer", rice straw was used as raw material, and the continuous pyrolysis device was respectively heated at 400°C, 450°C, 500°C, 550°C, and 600°C. Rice straw is pyrolyzed at high temperature to prepare biochar. With the help of the adsorption performance...

AI Technical Summary

Problems solved by technology

However, there are insufficient water absorption and water retention and slow release performance