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Modified rice husk biochar and preparation method and application thereof

A technology of biochar and chaff, which is used in carbon preparation/purification, application, fertilizer mixture, etc., can solve the problems of excessive heavy metals, food safety, etc., and achieve the effect of increasing specific surface area, increasing mineral elements, and passivating soil cadmium

Inactive Publication Date: 2020-04-07
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if biochar is directly applied to farmland without treatment, heavy metals may exceed the standard, and more seriously, it will cause food safety problems.

Method used

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  • Modified rice husk biochar and preparation method and application thereof
  • Modified rice husk biochar and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present embodiment provides a kind of preparation method of modified rice husk biochar, comprising the following steps:

[0025] Step 1. Carbonizing chaff to obtain chaff biochar: thermally decompose the dried chaff at 300°C for 2-4 hours in an oxygen-free environment to prepare chaff biochar, and grind it through a 300-mesh sieve for later use;

[0026] Step 2. Modification of rice husk biochar: Add the rice husk biochar obtained in step 1 to the modified salt, stir and shake for 24 hours, filter, and dry at 100°C; then pyrolyze and modify it under nitrogen at 600°C for 30 minutes to prepare Obtain this modified rice husk biochar; The modified salt is 100mL of suspension prepared from calcium phosphate (10g), potassium phosphate (5g) and magnesium hydroxide (5g) with a weight ratio of 2:1:1 , the total mass of the modified salt is 40% of the rice husk biochar mass (50g).

Embodiment 2

[0028] The present embodiment provides a kind of preparation method of modified rice husk biochar, comprising the following steps:

[0029] Step 1. Carbonizing chaff to obtain chaff biochar: thermally decompose the dried chaff at 400°C for 2-4 hours in an oxygen-free environment to prepare chaff biochar, and grind it through a 100-mesh sieve for later use;

[0030] Step 2. Modification of rice husk biochar: add the rice husk biochar obtained in step 1 to the modified salt, stir and shake for 24 hours, filter, and dry at 100°C; then pyrolyze and modify it under 550°C nitrogen environment for 60 minutes to prepare Obtain the modified rice husk biochar; the modified salt is a suspension prepared from calcium phosphate (10g), potassium phosphate (7.5g) and magnesium hydroxide (5g) with a weight ratio of 2:1.5:1 100mL, the total mass of the modified salt is 45% of the rice husk biochar mass (50g).

Embodiment 3

[0032] The present embodiment provides a kind of preparation method of modified rice husk biochar, comprising the following steps:

[0033] Step 1, chaff carbonization to obtain chaff biochar: dry chaff is thermally cracked at 500°C for 2 to 4 hours in an oxygen-free environment to prepare chaff biochar, and grind it through a 500-mesh sieve for later use;

[0034] Step 2. Modification of rice husk biochar: add the rice husk biochar obtained in step 1 to the modified salt, stir and shake for 36 hours, filter, and dry at 100°C; then pyrolyze and modify it in a nitrogen environment of 550°C for 90 minutes to prepare Obtain this modified rice husk biochar; The modified salt is 100mL of suspension prepared from calcium phosphate (15g), potassium phosphate (10g) and magnesium hydroxide (5g) with a weight ratio of 3:2:1 , the total mass of the modified salt is 30% of the rice husk biochar mass (100g).

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Abstract

The invention provides modified rice husk biochar and a preparation method and application thereof. The method comprises the following steps: S1, rice husks are carbonized to obtain rice husk biochar,namely, dry rice husks are subjected to thermal cracking at the temperature of 300-500 DEG C in an oxygen-free environment to obtain rice husk biochar, and the rice husk biochar is ground and sievedfor use; and S2, the rice husk biochar is modified, namely, modification salt is added into the rice husk biochar obtained in the step S1, stirring, filtering and drying are carried out, and pyrolysismodification is carried out in a nitrogen environment at 500-600 DEG C to obtain the modified rice husk biochar, wherein the modification salt is a turbid liquid prepared from calcium phosphate, potassium phosphate and magnesium hydroxide in a weight ratio of (1-3): (1-2): 1, and the total mass of the modification salt is 30-50% of the mass of the rice husk biochar. The modified rice husk biocharcan improve the contents of calcium, magnesium, potassium and other mineral nutrients in soil, relieve soil acidification, reduce the risk of heavy metal pollution to soil, and increase the rice yield and the organic matters in soil.

Description

technical field [0001] The invention relates to the technical field of biochar material preparation and application, in particular to a modified rice husk biochar and its preparation method and application. Background technique [0002] Acidic red soils in southern my country generally have problems such as acidification degradation, low organic matter content, low content of calcium and magnesium and other basic ions, and there are problems such as heavy soil texture, compaction, and poor water and fertilizer retention capacity. Applying organic manure and crop straw returning to the field can improve soil texture and alleviate soil acidification, but the input is large and the effect is slow, especially in acidification improvement. However, there are some obstacles to the direct return of straw to the field, such as increasing pests and diseases, affecting nitrogen fertilizer efficiency at seedling stage, affecting crop growth, slow maturity of straw, low nutrients, and h...

Claims

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Application Information

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IPC IPC(8): C01B32/05C05G3/80
CPCC05B7/00C01B32/05Y02P20/133
Inventor 夏文建张丽芳张文学刘佳刘增兵林杉李祖章杨成春唐先干王萍王少先
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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