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A kind of composite soil remediation agent and its preparation method and application

A soil remediation and reagent technology, applied in the field of soil remediation, can solve problems such as complex components

Active Publication Date: 2021-01-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN201510893844.8 discloses a soil remediation agent consisting of diatomite, fly ash, wollastonite, sepiolite, carboxymethyl starch, calcium magnesium phosphate fertilizer, starch phosphate monoester, (trimethylsilyl ) phosphate, isovalerenate bornyl ester, potassium carbonate and 4-guanidinobutyric acid, the repair agent of this component can effectively fix Pd in ​​the soil, but the components are too complicated

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  • A kind of composite soil remediation agent and its preparation method and application

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preparation example Construction

[0023] In the present invention, the preparation method of described biochar preferably comprises the following steps:

[0024] Heat-treat the raw materials for the preparation of biochar to obtain primary carbon materials;

[0025] The primary carbon material is impregnated in a solution including potassium permanganate and nitric acid for modification to obtain biochar.

[0026] The invention heat-treats raw materials for preparing biochar to obtain primary carbon materials. Before the heat treatment, the present invention preferably pretreats the raw materials for the preparation of biochar. The pretreatment includes crushing and drying. The crushing can obtain scraps below 100 mesh, and the drying can control the moisture content at 5 % or less is fine.

[0027] In the present invention, the heat treatment temperature is preferably 280-300°C, more preferably 285-295°C, and more preferably 287-293°C; the heat treatment time is preferably 2-4h, specifically 2.5h, 3h, 3.5h...

Embodiment 1

[0044] Preparation of biochar: crush corn stalks, pass through a 100-mesh sieve, then heat-treat at 285°C for 2 hours, and then place the obtained primary carbon material (50g) in a mixture of potassium permanganate and nitric acid (KMnO 4 The concentration is 0.15mol / L, HNO 3 The mass concentration is 40% and the volume is 500mL), kept at 80°C for 2h, extracted, washed 3 times with deionized water, and dried naturally to obtain biochar.

[0045] According to the dosage shown in Table 1, the quicklime, sodium humate and sodium polyacrylate are first mixed in a mixer, and then the rest of the materials are added, and the composite soil repair agent is obtained after mixing evenly.

Embodiment 2

[0047] Preparation of biochar: crush corn stalks, pass through a 100-mesh sieve, then heat-treat at 290°C for 2.5 hours, and then place the obtained primary carbon material (50g) in a mixture of potassium permanganate and nitric acid Medium (KMnO 4 The concentration is 0.1mol / L, HNO 3 The mass concentration is 45% and the volume is 500mL), incubated at 80°C for 2h, filtered, washed and dried to obtain biochar; the rest of the steps are the same as in Example 1.

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Abstract

The invention belongs to the technical field of soil restoration, and specifically relates to a composite soil restoration agent and a preparation method and applications thereof. The provided composite soil restoration agent comprises following components in parts by weight: 30 to 40 parts of diatomite, 10 to 25 parts of biomass charcoal, 5 to 15 parts of quicklime, 5 to 8 parts of sodium humate,and 1 to 3 parts of sodium polyacrylate. In the presence of quicklime, sodium polyacrylate, and sodium humate, diatomite and biomass charcoal can effectively adsorb and fix multiple heavy metal ionsin soil, and the movement and diffusion of heavy metals (pollution sources) in soil are inhibited.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, and in particular relates to a composite soil restoration agent and its preparation method and application. Background technique [0002] Industrial production will inevitably produce some waste residue, waste water and waste gas. The discharge of these wastes will bring harm to the environment. Once harmful substances enter the soil, they will affect the growth of crops. Therefore, effective restoration of polluted soil , becomes a matter of urgency. [0003] Chinese patent CN201510893844.8 discloses a soil remediation agent consisting of diatomite, fly ash, wollastonite, sepiolite, carboxymethyl starch, calcium magnesium phosphate fertilizer, starch phosphate monoester, (trimethylsilyl ) phosphate, isovalerenate bornyl ester, potassium carbonate and 4-guanidinobutyric acid, the remediation agent of this component can effectively fix Pd in ​​the soil, but the components are too complic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 梅磊祝水金陈进红惠译萱赵天伦曹跃芬曹翔阮铂诚陈恬谢文涛
Owner ZHEJIANG UNIV
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