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Soil heavy mental pollution repairing agent containing lignin biochar as well as preparation method and application thereof

A pollution remediation and biochar technology, applied in the field of soil remediation, can solve the problems of soil ecological environment and crop growth hazards, expand the way of waste utilization, overcome the poor ability to adsorb high-valent heavy metals, and facilitate application

Active Publication Date: 2018-03-13
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pulping black liquor is obtained by pulping wheat straw with ammonium method, and dry lignin powder can be obtained after drying and crushing. Although some research reports believe that this dry lignin powder can be used as fertilizer or improve soil properties, research in recent years has shown that the actual However, it is still very harmful to the soil ecological environment and crop growth, and the preparation of dry lignin powder may not be a good measure to effectively solve the pollution of papermaking waste.

Method used

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  • Soil heavy mental pollution repairing agent containing lignin biochar as well as preparation method and application thereof
  • Soil heavy mental pollution repairing agent containing lignin biochar as well as preparation method and application thereof
  • Soil heavy mental pollution repairing agent containing lignin biochar as well as preparation method and application thereof

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preparation example Construction

[0020] The invention relates to a preparation method of a soil heavy metal pollution remediation agent containing lignin biochar, comprising:

[0021] Mix biochar powder, bone powder, and attapulgite clay according to the weight ratio of 40-60:20-40:10-20 and ultrafinely pulverize to obtain a mixed powder, and add 2wt% to 5wt% carboxymethylcellulose sodium solution in Under the protection of nitrogen, slowly add to the mixed powder and stir thoroughly to obtain a viscous liquid;

[0022] Fully mix and soak the zeolite in the viscous liquid, remove it, heat and dry it;

[0023] Wherein, the biochar powder is prepared by high-temperature pyrolysis of lignin dry powder of papermaking waste liquid.

[0024] The amount of zeolite added is not particularly limited, as long as it can be fully soaked in the viscous liquid. The soaking time is generally 2-3 hours at room temperature. Gently stir and mix during soaking to speed up the combination of zeolite and viscous liquid. It is g...

Embodiment 1

[0045] A preparation method of a soil heavy metal pollution remediation agent containing lignin biochar, comprising:

[0046] Mix 40g of biochar powder, 40g of degummed bone powder, and 10g of attapulgite clay, and ultrafinely pulverize it to 320-350 mesh to obtain a mixed powder. Slowly add 220ml of 2wt% sodium carboxymethylcellulose solution to the mixture under nitrogen protection. In the powder and fully stirred to obtain a viscous liquid;

[0047] Soak 140g of 12-18 mesh zeolite in the viscous liquid, the soaking temperature is room temperature, and the soaking time is 2-3 hours. During soaking, gently stir every 10-20 minutes to promote mixing; remove after soaking, and dry at 50°C 12h, vested;

[0048] Wherein, the preparation method of the biochar powder is as follows: after drying and pulverizing the black liquor of wheat straw pulping in a paper mill to obtain dry lignin powder of papermaking waste liquid, placing the dry lignin powder of papermaking waste liquid in...

Embodiment 2

[0050] A preparation method of a soil heavy metal pollution remediation agent containing lignin biochar, comprising:

[0051] Mix 60g of biochar powder, 20g of degummed bone powder, and 20g of attapulgite clay, and ultrafinely pulverize it to 320-350 mesh to obtain a mixed powder. Slowly add 240ml of 5wt% sodium carboxymethylcellulose solution to the mixture under nitrogen protection. In the powder and fully stirred to obtain a viscous liquid;

[0052] Soak 150g of 12-18 mesh zeolite in the viscous liquid, the soaking temperature is room temperature, and the soaking time is 2-3 hours. During soaking, gently stir every 10-20 minutes to promote mixing; remove after soaking, and dry at 60°C 8h, vested;

[0053] Wherein, the preparation method of the biochar powder is as follows: after drying and pulverizing the black liquor of wheat straw pulping in a paper mill to obtain dry lignin powder of papermaking waste liquid, placing the dry lignin powder of papermaking waste liquid in ...

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Abstract

The invention relates to a soil heavy mental pollution repairing agent containing lignin biochar as well as a preparation method and application thereof. The method comprises the following steps thatbiochar powder, bone meal and attapulgite clay are mixed according to a weight ratio of (40 to 60) to (20 to 40) to (10 to 20), and are subjected to ultra-micro pulverization to obtain mixed powder; 2to 5 weight percent of sodium carboxymethylcellulose solution is slowly added into the mixed powder under the nitrogen gas protection and is fully stirred to obtain viscous liquid; zeolite is fully mixed and soaked in the viscous liquid and is then fished out; heating and drying are performed, wherein the biochar powder is prepared from papermaking waste liquid lignin dry powder through high-temperature thermal cracking. The defects of poor high-valent heavy metal adsorption capability and low adsorption efficiency of the lignin biochar are overcome; the waste utilization path by lignin is expanded.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a soil heavy metal pollution remediation agent containing lignin biochar and its preparation method and application. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. With the development of industry and agriculture and the increase of population, the amount of agricultural soil is decreasing, and the harmful substances in the soil are increasing. According to statistics, 90% of the pollutants in the world end up in the soil. However, the soil's tolerance to harmful substances is limited. When the accumulation of harmful substances exceeds the soil's tolerance, it will cause soil environmental quality to deteriorate. At present, soil environmental quality has become a major issue of global concern. Among them, heavy metal pollution is particularly noticeable because of its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 张杰刘佳刘荣乐金志农张海燕肖祖飞金晓芳赵姣
Owner NANCHANG INST OF TECH
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