Soil conditioner for passivation of heavy metals and preparation method of soil conditioner

A soil conditioner and heavy metal technology, applied in soil conditioning materials, chemical instruments and methods, restoration of contaminated soil, etc., can solve the problems of affecting soil microorganisms and animal functions, destroying soil structure, high sodium ion content, etc., to achieve reserve Rich, widely distributed, the effect of eliminating waste water discharge

Inactive Publication Date: 2016-07-06
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Industrially prepared humic acid is not suitable for use as a soil conditioner for two reasons: the humic acid obtained by the acid flocculation method is strongly acidic (pH 1-2), and it will affect soil microorganisms and animals when used in the soil. The function of using too much will make the soil acid; the humic acid obtained by the evaporation method has a high sodium ion content, and a large amount of use will destroy the soil structure

Method used

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  • Soil conditioner for passivation of heavy metals and preparation method of soil conditioner
  • Soil conditioner for passivation of heavy metals and preparation method of soil conditioner
  • Soil conditioner for passivation of heavy metals and preparation method of soil conditioner

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Embodiment 1

[0034] 1. Grind lignite from Shanxi, pass through a 10-mesh sieve, add to 0.1M NaOH solution and mix, the addition amount is 0.05g / mL; keep warm at 65°C and shake for 4 hours; put it at room temperature for 2 hours The upper humic acid extract is separated from the solid residue;

[0035] 2. Mix the solid residue with 0.1M NaOH solution, the addition amount is 0.05g / mL; keep warm at 65°C and shake for 4 hours; after standing at room temperature for 2 hours, separate the upper humic acid extract from the solid residue ;

[0036] 3. Repeat steps 2 and 3 times;

[0037] 4. Combine the humic acids obtained in steps 1, 2, and 3 together, and record the volume as V 腐殖酸 , add the calcium chloride solution that concentration is 1wt% successively, and the polyacrylamide (Tianjin Institute of Fine Chemical Industry) solution that concentration is 0.05wt%, leave standstill 1 hour to make humic acid flocculation and sedimentation after stirring; The supernatant (pH 11.1) was removed, and...

Embodiment 2

[0044] 1. Grind weathered coal from Xinjiang, pass through a 100-mesh sieve, add to 0.1M NaOH solution and mix, the addition amount is 0.1g / mL; keep warm at 40°C and ultrasonic for 1 hour; stand at room temperature for 4 hours, use The natural sedimentation method separates the upper humic acid extract from the solid residue;

[0045] 2. Mix the solid residue with 0.1M NaOH solution, the addition amount is 0.1g / mL; keep warm at 40°C and ultrasonic for 1 hour; let it stand at room temperature for 4 hours, and use the natural sedimentation method to mix the upper humic acid extract with the solid residue separation;

[0046] 3. Repeat steps 2 and 5 times;

[0047] 4. Combine the humic acids obtained in steps 1, 2, and 3 together, and record the volume as V 腐殖酸 , add the calcium chloride solution that concentration is 1wt% successively, and the polyacrylamide (Tianjin Institute of Fine Chemical Industry) solution that concentration is 0.05wt%, leave standstill 1 hour after stir...

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Abstract

The invention relates to a soil conditioner for passivation of heavy metals and a preparation method of the soil conditioner. The preparation method comprises the following steps: mixing a material which is rich in humic acid and a strongly alkaline solution; extracting the humic acid after heating the mixture; and carrying out combined flocculation on the humic acid to obtain the soil conditioner for passivation of the heavy metals. According to the preparation method, lignite and weathered coal which are distributed widely, abundant in reserves, low in price and easy to obtain are used as raw materials and are extracted in an environmentally friendly process, and the soil conditioner for passivation of the heavy metals is obtained by initiative combined flocculation. The soil conditioner contains calcium humate, is rich in functional groups such as carboxyl and hydroxyl, can effectively adsorb the heavy metals so as to reduce biological effectiveness of the heavy metals, and can be used for conditioning and repairing heavy metal polluted farmlands including acid soil.

Description

Technical field: [0001] The invention belongs to the technical field of soil conditioner preparation, in particular to an alkaline, calcium-rich humic acid soil conditioner prepared from coal and a preparation method thereof, which is applied to the treatment of heavy metal polluted farmland. technical background: [0002] Soil degradation caused by processes such as soil erosion, soil desertification, soil salinization, soil pollution, and reduction of soil organic matter is very common. Soil degradation not only reduces soil productivity, but also affects other ecological functions of soil. These ecological functions include regulating the distribution of surface water, controlling the cycle of nutrient elements, absorbing, passivating and degrading harmful substances, buffering the emission of greenhouse gases, and preserving microbial genes, etc. . Therefore, soil degradation not only causes economic losses, but also reduces environmental quality and affects human heal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32B09C1/08C09K101/00
CPCB09C1/08C09K17/32C09K2101/00
Inventor 袁国栋孟凡德韦婧毕冬雪王海龙刘兴元林小明
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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