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

A technology of rice straw and montmorillonite, which is applied in the directions of urea compound fertilizer, layered/coated fertilizer, nitrogen fertilizer, etc., can solve the problems of water absorption and water retention, and insufficient slow release performance.

Inactive Publication Date: 2017-07-25
宿州市逢源生物科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

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

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0016] A preparation method of rice straw charcoal-based slow-release fertilizer coated with lignin-montmorillonite-chitosan compound, characterized in that, the following steps are carried out:

[0017] a. Dry 50kg of rice straw at 40-50°C to constant weight, mechanically cut it into a sample of 4-8cm, and put it into a pyrolysis device at 500-600°C. After pyrolysis, rice straw charcoal powder is obtained, and cooled to At room temperature, biochar is obtained;

[0018] b. Add distilled water to 8kg alkali lignin at 1:10, heat and stir at 70-80°C for 1 hour to obtain component A; add copper sulfate solution to 9kg montmorillonite at 1:5, stir for 4 hours to obtain copper-containing montmorillonite ; Add acetic acid to 10kg chitosan to make a solution with a concentration of 3-5%, add 1kg glycerin, mix with component A and copper-containing montmorillonite, and disperse evenly by ultrasonic oscillation for 2 hours;

[0019] c. Mix 12kg starch and 0.2kg sodium hydroxide, add d...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
CPCC05C9/00C05G3/00C05G3/80C05G3/90C05G5/12C05G5/37C05D9/00Y02A40/22Y02P60/21
Inventor 解安庆
Owner 宿州市逢源生物科技有限公司
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