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Composite heavy metal passivator and preparation method thereof

A heavy metal passivator and solvent technology, applied in chemical instruments and methods, fertilizer mixtures, other chemical processes, etc. Carbon function and other issues, to achieve good effect of passivating heavy metals in soil, realizing resource utilization and efficient utilization, and the effect of lasting effect

Pending Publication Date: 2022-07-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of biochar has the following defects: First, most of the preparation of biochar uses straw, kitchen waste, garden waste, fruit peel waste, etc. as raw materials, and the prepared biochar has a certain heavy metal passivation ability. However, it is relatively weak, resulting in a large amount of actual use and high costs; second, biochar itself requires a certain temperature during the cracking process, and if some materials are added during the process, it may affect the function of biochar, some It may be beneficial to improve the effect of biochar, and some may inhibit the effect of biochar; third, the use of raw materials is mixed, because the effect of biochar made of different biological materials has certain differences, using a variety of biological materials mixed together will cause As a result, the restoration effect of biochar on soil heavy metals cannot be guaranteed; Fourth, most materials are mechanically mixed with biochar after biochar is made, which does not fundamentally improve the properties of biochar

Method used

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  • Composite heavy metal passivator and preparation method thereof
  • Composite heavy metal passivator and preparation method thereof
  • Composite heavy metal passivator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a composite heavy metal passivator, comprising the steps:

[0030] (1) 3 parts of bagasse and 2 parts of bovine bone meal are fully ground and pulverized and mixed, pass through a 100-mesh sieve, put into a closed incinerator, pass into nitrogen protection, create an oxygen-free environment, start heating at room temperature, and the heating rate is 10 ° C / min, after heating to 500°C, controlled at 500±10°C, isolated from air and heated for 3 hours to make biochar;

[0031] (2) take out the biochar obtained in step (1), put it into ethanol for immersion at room temperature for 15 minutes, continuously stir during the immersion, take out and filter, and keep the residue for air-drying;

[0032] (3) Put the air-dried biochar into 0.02mol / L dilute sulfuric acid, heat it in an airtight manner to a temperature of 70°C, keep stirring continuously during the heating process, keep it for 3h, then cool and filter, leave the residue, and put the residue a...

Embodiment 2

[0034] A preparation method of a composite heavy metal passivator, comprising the steps:

[0035] (1) 6 parts of bagasse and 1 part of bovine bone meal are fully ground and pulverized and mixed, pass through a 100-mesh sieve, put into a closed incinerator, pass into nitrogen protection, create an oxygen-free environment, start heating at room temperature, and the heating rate is 10 ° C / min; after the temperature rises to 500°C, control the temperature at 500±10°C, isolate the air and heat for 3 hours to make biochar;

[0036] (2) taking out the biochar obtained in step (1), soaking it in methanol for 15 minutes at room temperature, stirring continuously during the soaking, taking out and filtering, and keeping the residue for air-drying;

[0037] (3) Put the air-dried biochar into 0.04mol / L dilute hydrochloric acid, heat it in an airtight manner to a temperature of 70°C, keep stirring continuously during the heating process, keep it for 3h, then cool and filter, leave the res...

Embodiment 3

[0039] A preparation method of a composite heavy metal passivator, comprising the steps:

[0040] (1) 3 parts of bagasse and 1 part of bovine bone meal are fully ground and pulverized, mixed, passed through a 100-mesh sieve, put into a closed incinerator, protected by nitrogen, and an anaerobic environment is created. Start heating at room temperature, and the heating rate is 10 ° C / min; after the temperature rises to 500°C, control the temperature at 500±10°C, isolate the air and heat for 3 hours to make biochar;

[0041] (2) Take out the biochar, put it into ethanol for immersion at room temperature for 15 minutes, continuously stir during the immersion, take out and filter, and keep the residue for air-drying;

[0042](3) Put the air-dried biochar into 0.03mol / L dilute sulfuric acid, heat it in a closed place to a temperature of 70°C, keep stirring continuously during the heating process, keep it for 3h, then cool and filter, leave the residue, and put the residue at 65°C ...

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Abstract

The invention discloses a composite heavy metal passivator and a preparation method thereof.The method comprises the steps that 1, 3-6 parts of bagasse and 1-2 parts of bone meal are ground, smashed, mixed, sieved, put into a closed incinerator and heated in an air isolation mode, and biochar is prepared; (2) taking out the biochar, soaking in a solvent at normal temperature, stirring, taking out, filtering, and air-drying residues; and (3) putting the air-dried charcoal into inorganic acid, heating in a sealed manner, continuously stirring during the period, taking out and filtering, drying residues to constant weight, and then grinding, crushing and sieving again to prepare the composite heavy metal passivator. The composite heavy metal passivator obtained through bone meal modified biochar has a good soil heavy metal passivation effect, can achieve synchronous passivation of various soil heavy metals, and can also improve the soil pH and the available phosphorus content at the same time.

Description

technical field [0001] The invention relates to the technical field of soil remediation with biochar, and more particularly to a composite heavy metal passivator and a preparation method thereof. Background technique [0002] Mining, industrial "three wastes" discharge, sewage irrigation, and the unreasonable application of pesticides and fertilizers have caused soil heavy metal pollution. Heavy metals in soil will not only affect the yield and quality of crops, but also enter the human body through groundwater and the food chain, affecting human health. Heavy metal pollution has the characteristics of long-term, hidden, and non-degradable, so it is difficult to remove from polluted soil. In order to better manage and make good use of polluted farmland, chemical passivation technology is generally used to treat heavy metal-contaminated soil in farmland soil. Heavy metal chemical passivation technology is to change the chemical form of heavy metals in soil by adding exogeno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K109/00
CPCC09K17/06C09K2109/00Y02E50/10
Inventor 李晓敏黄国勇马占萍鲁寒莎郭心怡
Owner SOUTH CHINA NORMAL UNIVERSITY
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