Acidic biochar fertilizer suitable for saline-alkali soil and preparation method thereof

A biochar, saline-alkali land technology, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems that the saline-alkali soil cannot provide enough organic matter, cannot significantly reduce soil pH, and has limited ability to reduce soil pH, etc., and achieves far-reaching social significance. and economic value, the preparation method is simple and controllable, and the effect of improving food and agricultural security

Inactive Publication Date: 2020-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN104211545A discloses a special biochar-based organic-inorganic compound fertilizer for acidic soil and its preparation method. The method utilizes the alkaline characteristics of traditional biochar and uses it as a controlled-release material and adsorption material together with urea and phosphoric acid. Combining ammonium and other substances to prepare compound fertilizer can increase soil pH and effectively improve acidic soil, but it is limited in saline-alkali soil due to its alkaline characteristics
Chinese patent application CN 105542785A discloses an alkaline soil improver and its preparation method. The method is made of phosphoric acid, furfural residue, wheat flour and ammonium phosphate in specific proportions. It has the advantage of simple preparation, but it cannot Significantly lowers the pH of the soil and does not provide enough organic matter for saline-alkali soils
At the same time, hydrothermal carbon itself will have a small amount of acidic functional groups to reduce the pH of alkaline soils, but the ability to reduce soil pH is limited, and after being applied to the soil, it will slowly become alkaline over time, and cannot achieve long-term improvement.

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  • Acidic biochar fertilizer suitable for saline-alkali soil and preparation method thereof

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Embodiment 1

[0021] (1) Preparation of biochar: Clean up the collected yak dung, dry it, crush it through a 40-mesh sieve, take 10 g of the sieved yak dung and mix it with 50 mL of deionized water and place it in a hydrothermal reaction kettle. Mpa nitrogen repeatedly purged the reactor for 3 times, carried out hydrothermal reaction at 150°C, stirred at a speed of 100r / min, stayed for 0.5h when reaching the final temperature, cooled to room temperature, and washed the hydrothermal solution with absolute ethanol until Colorless, then washed with distilled water until neutral, then suction filtered, and the solid product was dried to obtain biochar;

[0022] (2) Preparation of acidic biochar fertilizer: Take 2g of biochar obtained in step (1) and mix with 20mL of 0.05mol / L nitric acid, shake in a shaker at 25°C and 120r / min for 6h, and rinse with deionized water after the end Wash to adjust the pH value and filter with suction. After drying at 100°C, pass through a 60-mesh sieve to obtain ac...

Embodiment 2

[0025] (1) Preparation of biochar: Clean up the collected yak dung, dry it, crush it through a 50-mesh sieve, take 10 g of the sieved yak dung and mix it with 60 mL of deionized water and place it in a hydrothermal reaction kettle. Mpa nitrogen repeatedly purged the reactor for 3 times, carried out hydrothermal reaction at 180°C, stirred at a speed of 110r / min, stayed for 1h when the final temperature was reached, cooled to room temperature, and washed the hydrothermal solution with absolute ethanol until it was completely dry. color, and then washed with distilled water until neutral, then suction filtered, and the solid product was dried to obtain biochar;

[0026] (2) Preparation of acidic biochar fertilizer: Take 2g of biochar obtained in step (1) and mix with 30mL of 0.06mol / L nitric acid, shake in a shaker at 28°C and 140r / min for 12h, and rinse with deionized water after the end Wash to adjust the pH value and filter with suction. After drying at 105°C, pass through a 7...

Embodiment 3

[0029] (1) Preparation of biochar: Clean up the collected yak dung, dry it, crush it through a 60-mesh sieve, take 10 g of the sieved yak dung and mix it with 70 mL of deionized water and place it in a hydrothermal reaction kettle. Mpa nitrogen repeatedly purged the reactor for 3 times, carried out hydrothermal reaction at 200°C, stirred at a speed of 120r / min, stayed for 1.5h when reaching the final temperature, cooled to room temperature, and washed the hydrothermal solution with absolute ethanol to Colorless, then washed with distilled water until neutral, then suction filtered, and the solid product was dried to obtain biochar;

[0030] (2) Preparation of acidic biochar fertilizer: Take 2g of biochar obtained in step (1) and mix with 40mL of 0.1mol / L nitric acid, shake in a shaker at 30°C and 150r / min for 24h, and rinse with deionized water after the end Wash to adjust the pH value and filter with suction. After drying at 110°C, pass through an 80-mesh sieve to obtain acid...

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Abstract

The invention discloses an acidic biochar fertilizer suitable for saline-alkali soil and a preparation method thereof. The acidic biochar fertilizer comprises biochar as a raw material. The method comprises the following steps: drying yak manure, crushing and sieving the manure; mixing the sieved yak manure with deionized water, putting the mixture into a hydrothermal reaction kettle, and carryingout a hydrothermal reaction; washing the hydrothermal solution obtained after the reaction is finished with absolute ethyl alcohol until the hydrothermal solution is colorless; washing the hydrothermal solution with distilled water until the hydrothermal solution is neutral, then carrying out suction filtration, and drying the solid product to obtain biochar; mixing the biochar with a nitric acidsolution, oscillating the mixture, washing the mixture with deionized water, regulating the pH value, carrying out suction filtration, drying, sieving to obtain acidic biochar, granulating the acidicbiochar with a disc granulator, and drying to obtain the acidic biochar fertilizer. The method is simple, controllable and easy to implement; the acidic biochar fertilizer prepared by the invention can reduce the pH of saline-alkali soil and improve the quality of cultivated land; the biomass resource utilization efficiency is improved, and the solid waste environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to an acidic biochar fertilizer suitable for saline-alkali soil and a preparation method thereof. Background technique [0002] The area of ​​saline-alkali land in my country is large, about 3.5×10 8 hm 2 , accounting for 36% of the country's cultivated land, widely distributed and of various types. The low soil productivity, microbial diversity and organic matter content caused by soil salinization have exacerbated the deterioration of the ecological environment and hindered the development of agricultural production, and the application of traditional fertilizers often aggravates the degree of soil salinization. The annual output of yak manure in my country is large, and the problem of its resource utilization needs to be solved urgently. Under the current requirements of environmental protection and circular economy, it is an important research to develop a fertilizer and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/80C05G5/12C02F11/10C02F103/20
CPCC02F11/10C02F2103/20
Inventor 陈冠益孙于茹钟磊田静楠武文竹颜蓓蓓马文超宋英今
Owner TIANJIN UNIV
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