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Heavy metal curing agent for repairing vanadium ore contaminated soil and repairing method

A technology of polluted soil and solidifying agent, applied in the restoration of polluted soil, etc., can solve the problems of severe vasospasm, hyperactivity of gastrointestinal motility, reduced bioavailability, etc., to reduce toxic leaching rate, increase organic matter content, increase soil The effect of fertility

Active Publication Date: 2015-07-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Data show that vanadium allergy and vanadium poisoning can cause asthma, conjunctivitis, rhinitis and other diseases, and may also cause severe vasospasm and gastrointestinal motility in kidneys, spleen, intestines and other organs. heavy metals for curing, reducing their bioavailability
Conventional curing agents include quicklime, apatite, bentonite, etc. The types of heavy metals involved are mainly lead, copper, zinc, etc. There are few reports on the development of curing agents especially for vanadium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A heavy metal curing agent for repairing vanadium ore polluted soil, the mass ratio of its components is: 75% goethite, 25% protonated chitosan, the goethite and protonated chitosan will be ground to 50 mesh well mixed;

[0013] The preparation method of described goethite is: first under the condition of stirring to 0.5mol / L Fe(NO 3 ) 3 Add 2.0mol / L NaOH solution to the solution until the pH of the system is 12.9, then age at a constant temperature at 70°C for 48 hours, wash the obtained precipitate with water until the effluent is neutral, and grind it through a 50-mesh sieve after drying to obtain goethite;

[0014] The preparation method of the protonated chitosan is as follows: first add chitosan with a degree of deacetylation of 80.0% to 95.0% to soak in 0.1mol / L HCl solution for 1 hour, and use 1mol / L HCl solution during soaking Adjust the pH of the system to 4.6, and then dry it in a constant temperature drying oven at 105°C for 24 hours to obtain flaky proton...

Embodiment 2

[0018] A heavy metal curing agent for repairing vanadium ore polluted soil, the mass ratio of its components is: 72% goethite, 28% protonated chitosan, and the goethite and protonated chitosan will be ground to 50 mesh well mixed;

[0019] The preparation method of described goethite is: first under the condition of stirring to 0.5mol / L Fe(NO 3 ) 3 Add 2.0mol / L NaOH solution to the solution until the pH of the system is 12.5, then age at a constant temperature at 70°C for 48 hours, wash the obtained precipitate with water until the effluent is neutral, and grind it through a 50-mesh sieve after drying to obtain goethite;

[0020] The preparation method of the protonated chitosan is as follows: first add chitosan with a degree of deacetylation of 70.0% to 80.0% in 0.1mol / L HCl solution and soak for 1 hour, and use 1mol / L HCl solution during soaking Adjust the pH of the system to 5.1, and then dry it in a constant temperature drying oven at 105°C for 24 hours to obtain flaky p...

Embodiment 3

[0024] A heavy metal curing agent for repairing vanadium ore polluted soil, the mass ratio of its components is: 68.5% goethite, 31.5% protonated chitosan, the goethite and protonated chitosan will be ground to 50 mesh well mixed;

[0025] The preparation method of described goethite is: first under the condition of stirring to 0.5mol / L Fe(NO 3 ) 3 Add 2.0mol / L NaOH solution to the solution until the pH of the system is 12.8, then age at a constant temperature at 70°C for 48 hours, wash the obtained precipitate with water until the effluent is neutral, and grind it through a 50-mesh sieve after drying to obtain goethite;

[0026] The preparation method of the protonated chitosan is as follows: first add chitosan with a degree of deacetylation of 70.0% to 80.0% in 0.1mol / L HCl solution and soak for 1 hour, and use 1mol / L HCl solution during soaking Adjust the pH of the system to 5.0, and then dry it in a constant temperature drying oven at 105°C for 24 hours to obtain flaky p...

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PUM

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Abstract

The invention discloses a heavy metal curing agent for repairing vanadium ore contaminated soil and a repairing method. The heavy metal curing agent consists of the following components in percentage by weight: 65-75% of goethite and 25-35% of protonated chitosan, and the goethite which is ground to be 50 meshes and the ground protonated chitosan are mixed uniformly; the method for repairing the vanadium ore contaminated soil with the heavy metal curing agent comprises the following steps: deeply ploughing the contaminated soil, applying the curing agent and uniformly raking, watering in the process of deep ploughing and uniformly raking, wherein watering is performed once every other day in a maintenance period; and curing for 1-2 weeks. According to the heavy metal curing agent disclosed by the invention, the goethite, which is taken as a natural mineral, is free from toxicity and pollution, and the protonated chitosan is also conducive to the improvement of organic matter content in the soil and the increase of soil fertility; therefore after the mixture is applied, the pH value of the soil is not significantly changed, and the toxicity leaching rate of vanadium and other heavy metals in the repaired soil can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of restoration of soil heavy metal pollution, and in particular relates to a heavy metal curing agent for repairing vanadium ore polluted soil and a restoration method. Background technique [0002] With the increase of vanadium mining in my country, the heavy metal pollution in the soil near the mine, especially the pollution of vanadium is becoming more and more serious. Excessive vanadium and other heavy metals in the soil will be absorbed by plants, and gradually enriched in animals and even humans through the food chain, causing various symptoms of heavy metal poisoning. Data show that vanadium allergy and vanadium poisoning can cause asthma, conjunctivitis, rhinitis and other diseases, and may also cause severe vasospasm and gastrointestinal motility in kidneys, spleen, intestines and other organs. Heavy metals solidify, reducing their bioavailability. Conventional curing agents include quicklime, apatite, ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 蒋建国李德安李天然
Owner TSINGHUA UNIV
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