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Composite heavy metal polluted soil in-situ fixing method

A technology of polluted soil and heavy metals, applied in the direction of restoration of polluted soil, etc., can solve problems such as loss of use function of soil

Active Publication Date: 2012-01-04
刘阳生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong alkaline conditions make the soil lose its use function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1), preparation of heavy metal contaminated soil remediation agent: Bentonite, ferrous sulfide, magnesium sulfate, magnesium sulfite, magnesium oxide, calcium hydroxide and calcium dihydrogen phosphate according to 80:15:0.5:8:1:10:1 , and mix well to become heavy metal contaminated soil remediation agent.

[0031] 2) Apply heavy metal contaminated soil remediation agent: use a forklift to send the contaminated soil into the hopper of the crusher, convey it to the mixer through the belt after crushing, mix with the remediation agent, and mix according to the weight ratio of soil: agent = 15:1 Evenly, and then transported to the stacking site via the conveyor belt, to obtain the soil after adding the agent.

[0032] 3) Restoration: After 1 month, the heavy metals cadmium, chromium, mercury, and lead in the polluted soil were reduced to low-priced immobilized heavy metals, heavy metal precipitates or minerals, and lost their bioavailability, realizing heavy metal polluted...

Embodiment 2

[0034] 1), preparation of heavy metal contaminated soil remediation agent: kaolin, ferrous sulfide, magnesium sulfate, magnesium sulfite, magnesium oxide, calcium hydroxide and calcium hydrogen phosphate according to 90:0.5:5:1.8:5:2:5, Mix evenly to become heavy metal contaminated soil remediation agent.

[0035] 2) Apply heavy metal-contaminated soil remediation agent: use a forklift to send the contaminated soil into the hopper on the crusher, and after crushing, convey it to the mixer through a belt, mix it with the remediation agent, and mix according to the weight ratio of soil: agent = 10:1 Evenly, and then sent to the stacking place by the conveyor belt to obtain the soil after adding the agent.

[0036] 3) Restoration: After 1 month, the heavy metals cadmium, chromium, mercury, and lead in the polluted soil were reduced to low-priced immobilized heavy metals, heavy metal precipitates or minerals, and lost their bioavailability, realizing heavy metal polluted soil The...

Embodiment 3

[0038] 1), preparation of heavy metal contaminated soil remediation agent: mix bentonite, ferrous sulfide, magnesium sulfate, magnesium sulfite, magnesium oxide, calcium hydroxide and calcium phosphate according to 85:6:2:3:2:3:4 Evenly, it becomes a heavy metal contaminated soil remediation agent.

[0039]2) Apply heavy metal-contaminated soil remediation agent: the forklift sends the contaminated soil into the hopper on the crusher, after crushing, it is conveyed to the mixer through the belt, mixed with the remediation agent, and mixed according to the weight ratio of soil: agent = 20:1, Then it is sent to the stacking place through the conveyor belt to obtain the soil after adding the medicament.

[0040] 3) Restoration: After 1 month, the heavy metals cadmium, chromium, mercury, and lead in the polluted soil were reduced to low-priced immobilized heavy metals, heavy metal precipitates or minerals, and lost their bioavailability, realizing heavy metal polluted soil The in...

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Abstract

The invention discloses a composite heavy metal polluted soil in-situ fixing method. The method comprises the following steps of: preparing a heavy metal polluted soil restoration agent by using 80 to 90 weight parts of bentonite or kaolin serving as a filling agent, 0.5 to 15 weight parts of ferrous sulfide, 0.5 to 5 weight parts of magnesium sulfate, 1.5 to 8 weight parts of magnesium sulfite, 1 to 5 weight parts of magnesium oxide, 2 to 10 weight parts of calcium hydroxide and 1 to 5 weight parts of phosphorus-containing preparation; and mixing the components and heavy metal polluted soil according to the weight ratio of 1:(5-20), and uniformly stirring to make the humidity of the soil kept between 15 and 30 percent, wherein heavy metal ions in the polluted soil are converted into water-insoluble metal sulfides, hydroxides, multi-metal co-precipitates, basic carbonates and phosphate minerals, the biological activity of heavy metal is lost, and the heavy metal is fixed in the soil. The restored soil meets the requirement of second-level standard values of 'Environmental Quality Standard for Soil' (GB 15618-1995) in China.

Description

technical field [0001] The invention relates to a method for in-situ immobilization of composite heavy metal polluted soil, in particular to a method for in-situ immobilization and repair of composite heavy metal contaminated soil of mercury, cadmium, chromium and lead, through redox reaction and co-precipitation reaction And mineralization reaction, the heavy metal ions are converted into water-insoluble metal sulfides, hydroxides, polymetallic co-precipitates, basic carbonates and phosphate minerals, which are fixed in the soil, and the heavy metals lose their biological activity. After remediation, the soil meets the requirements of the secondary standard value of China's "Soil Environmental Quality Standard" (GB 15618-1995). Background technique [0002] my country's heavy metal pollution incidents are entering a period of high incidence. [0003] In 2005, the China Geological Survey found that 13% of the country's land area was polluted; among all types of pollution, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 刘阳生
Owner 刘阳生
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