Dual-effect alkali-modified charcoal-based vermiculite compound fertilizer for repairing heavy metal pollution of soil and regulating fertility and preparation method of dual-effect alkali-modified charcoal-based vermiculite compound fertilizer

A technology for soil remediation and biochar, applied in the restoration of polluted soil, urea compound fertilizer, fertilizer mixture, etc., can solve problems such as low fertilizer utilization efficiency and soil heavy metal pollution

Pending Publication Date: 2021-07-30
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a biochar-based vermiculite compound fertilizer that can efficiently fix soil heavy metals and has soil fertility as soil in order to solve the problem of soil heavy metal pollution and low utilization efficiency of N, P and K fertilizers in agricultural soil. Restorative agent to realize straw returning to the field and its resource utilization

Method used

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  • Dual-effect alkali-modified charcoal-based vermiculite compound fertilizer for repairing heavy metal pollution of soil and regulating fertility and preparation method of dual-effect alkali-modified charcoal-based vermiculite compound fertilizer
  • Dual-effect alkali-modified charcoal-based vermiculite compound fertilizer for repairing heavy metal pollution of soil and regulating fertility and preparation method of dual-effect alkali-modified charcoal-based vermiculite compound fertilizer
  • Dual-effect alkali-modified charcoal-based vermiculite compound fertilizer for repairing heavy metal pollution of soil and regulating fertility and preparation method of dual-effect alkali-modified charcoal-based vermiculite compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of the dual-effect alkali-modified biochar-based vermiculite compound fertilizer of the present embodiment comprises the following steps:

[0044] Step 1: First, collect the corn stalks in batches in the field. After the collection, cut the corn stalks into small pieces of about 5 cm, and dry them in a temperature-controlled oven at 60° C. for 24 hours. The dried corn stalks were placed in a plant micro grinder and pulverized into particles with a diameter of about 2 mm.

[0045] Step 2: Add the air-dried and crushed corn stalks, heavy superphosphate, and vermiculite into the micro-mixer according to the mass ratio of 5:1:1 and 10:1:1 respectively, mix them thoroughly for 5 minutes, and take them out for use.

[0046] Among them, the corn stalks used were collected from the farmland in the suburbs of Kaifeng, Henan; the calcium superphosphate used was purchased from Yunnan Yuntianhua International Chemical Co., Ltd. 2 o 5 ) content ≥ 46.0%, available p...

Embodiment 2

[0058] In this example, a single corn stalk is pyrolyzed to prepare a KOH reduction-modified biochar fertilizer, which includes the following steps:

[0059] Step 1: First, collect the corn stalks in batches in the field. After the collection, cut the corn stalks into small pieces of about 5 cm, and dry them in a temperature-controlled oven at 60° C. for 24 hours.

[0060] Step 2: The dried corn stalks are placed in a plant micro grinder and pulverized into granular raw materials with a diameter of about 2mm, and then put into a container and sealed for later use.

[0061] Among them, the corn stalks used were collected from farmland in the suburbs of Kaifeng, Henan.

[0062] Step 3: Put the single corn stalk raw material in step 2 into a tube furnace for high-temperature pyrolysis. 2 In a protective atmosphere, composite biochar materials were prepared at a pyrolysis temperature of 450°C, which were marked as B 450 .

[0063] The specific operation of this step is: open th...

Embodiment 3

[0069] The specific surface area, average pore diameter and total pore volume of the biochar-based vermiculite compound fertilizer prepared in Example 1 and the single biochar prepared in Example 2 are shown in Table 1, and the microstructure scanning energy spectrum is shown in Table 1. figure 1 . The acidic functional group content is detailed in Table 2, and the FTIR spectrum analysis is detailed in figure 2 . The elemental composition of the biochar-based vermiculite compound fertilizer prepared in Example 1 and the single biochar prepared in Example 2 was determined, as shown in Table 3.

[0070] Table 1 Specific surface area, average pore diameter and total pore volume of different biochar materials

[0071] Biochar Compound Fertilizer Specific surface area (m 2 g -1 )

Average pore size (nm) Total pore volume (×10 -3 cc·g -1 )

KB 600

89.94 3.06 68.71 KB 750

84.73 2.53 82.01 wxya 600

159.26 9.58 181.50 ...

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Abstract

The invention relates to the technical field of farmland soil heavy metal pollution remediation and improvement, in particular to a dual-effect alkali- modified charcoal-based vermiculite compound fertilizer for repairing heavy metal pollution of soil and regulating fertility and a preparation method of the dual-effect alkali modified charcoal-based vermiculite compound fertilizer. The compound fertilizer is prepared from the following raw materials in parts by weight: 4 parts of inorganic loading and reduction modification combined biochar and 1 part of urea, the inorganic loading and reduction modification combined biochar is prepared from inorganic loading modified biochar and a KOH solution according to the mass ratio of 1: 1, and the concentration of the KOH solution is 1 mol/L; and the inorganic loaded modified charcoal is prepared from the following raw materials in parts by weight: 5-10 parts of corn straw, 1 part of triple superphosphate and 1 part of vermiculite. A verification result shows that the biochar-based vermiculite compound fertilizer has relatively good adsorption and passivation performance on heavy metals in soil, and has a relatively good fertility effect.

Description

technical field [0001] The invention relates to the technical field of remediation and improvement of heavy metal pollution in farmland soil, in particular to a double-effect alkali-modified biochar-based vermiculite compound fertilizer for remediation of soil heavy metal pollution and fertility regulation and a preparation method thereof. Background technique [0002] As a persistent toxic pollutant, heavy metals will accumulate for a long time because they cannot be biodegraded once they enter the farmland soil, and will pose a potential threat to human health through various channels such as the food chain (Zhang Jinlian et al., 2017; Tao Xiuzhen et al., 2017 ; Sun Hui et al., 2009). The 2014 "National Soil Pollution Survey Bulletin" shows that the rate of pollutants such as heavy metals in cultivated land soil exceeds the standard rate of 19.4%. In view of this, appropriate measures should be taken to effectively control and repair heavy metal pollution in farmland soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/80B09C1/00
CPCC05G3/00C05G3/40C05G3/80C05B1/04B09C1/00C05C9/00C05D9/00C05F11/00
Inventor 陈志凡王清利化艳旭丁永丰蒋兴园
Owner HENAN UNIVERSITY
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