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Magnetic separation purifying treatment technology for removing heavy metal pollution of soil

A heavy metal and soil technology, applied in the field of environmental materials and resources and environment, can solve the problems of non-magnetic and limited application of magnetic separation methods.

Inactive Publication Date: 2016-08-03
CUG WUHAN GOLDEN SHIELD ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the debonding agent and polymer displacing agent as well as lead, cadmium, arsenic, chromium, and mercury themselves are not magnetic, which greatly limits the application of the magnetic separation method.

Method used

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  • Magnetic separation purifying treatment technology for removing heavy metal pollution of soil
  • Magnetic separation purifying treatment technology for removing heavy metal pollution of soil
  • Magnetic separation purifying treatment technology for removing heavy metal pollution of soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A magnetic separation, separation, purification and treatment process for removing heavy metal pollution in soil. The core-shell structure magnetic solid ammonia carboxyl adsorbent granular material FS-[ammonia carboxyl AG] is used as a magnetic carrier to adsorb and capture heavy metals in soil, and then magnetic Election is separated from soil, comprises the following steps successively:

[0051] ①Soil preparation and mud making steps: Take 1000g of Cd-contaminated farmland soil in a certain place, screen out crop stalks, gravel, etc., use a general-purpose magnetic separator to remove magnetic substances such as iron wire and nails, etc.; then use a pulverizer and a mill The soil is ground to about 60-100 mesh, and water is added to make the soil a slurry with a mud content of 20% (mass percentage);

[0052] ②The step of magnetic carrier trapping heavy metals: adding 10g of FS-[aminocarboxy AG] granular material to the slurry obtained in step ①, and fully mixing for ...

Embodiment 2

[0063] The difference between embodiment 2 and embodiment 1 is that the magnetic carrier is a regenerated magnetic carrier, and the regenerated magnetic carrier is the reactive magnetic carrier obtained in step ④ of embodiment 1 after elution of heavy metals.

[0064] According to the magnetic separation separation and purification treatment process of this embodiment, the cadmium in the weakly acid-dissolved state and iron-manganese oxide-bound state and part of the organic-bound cadmium in the soil can be removed from the soil, and the removal rate of cadmium can reach more than 74%.

Embodiment 3

[0066] A magnetic separation, separation, purification and treatment process for removing heavy metal pollution from soil. Natural magnetic mineral powder is used as a magnetic carrier to absorb and capture heavy metals in soil, and then magnetic separation and soil separation are carried out. The specific steps are as follows:

[0067] ①Soil preparation and mud making steps: take 1000g of cadmium and arsenic compound polluted farmland soil in a certain place, screen out crop stalks, gravel, etc., and use a general magnetic separator to remove magnetic substances such as iron wire and nails; then use a pulverizer and The mill grinds the soil to about 60-100 mesh, and water is added to make the soil a mud with a mud content of 30% (mass percentage);

[0068] ②The step of magnetic carrier trapping heavy metals: adding 10 g of natural magnetic mineral powder to the slurry obtained in step ①, and fully mixing for 10 hours to obtain a mixed slurry of magnetic carrier loaded with cad...

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Abstract

The invention relates to a magnetic separation purifying treatment technology for removing heavy metal pollution of soil, which is characterized in that a responsive or adsorptive magnetic carrier granular material is used for adsorption trapping of heavy metals in soil, and then magnetic separation and soil separation are carried out; the technology comprises the following steps: 1) preparing the soil and producing slurry; 2) performing adsorption trapping on the heavy metals by a magnetic carrier; 3) performing magnetic separation; 4) regenerating the material; and 5) recovering the heavy metals and performing concentrated treatment. The technology can compensate disadvantages of current soil dressing methods, chemical methods, physical methods and biological methods for soil restoration, has the advantages that the technology process is simple, the magnetic carrier granular material can be regenerated and recycled, the treatment cost is low, advantages of an ore dressing technology and an ore dressing machine can be performed, removal, decrement, purification and restoration of the heavy metal pollution for various scales of the soil are developed, no lots of dirty (waste) water is generated during a whole process, secondary pollution or allopatric pollution cannot be generated, and the heavy metals can be recovered.

Description

technical field [0001] The invention relates to a magnetic separation, separation, purification and treatment process for removing soil heavy metal pollution, and belongs to the field of environmental materials and resource environment. Background technique [0002] At present, there are mainly five types of soil heavy metal pollution control methods, one is engineering measures: including measures such as soil replacement and deep plowing; the second is traditional chemical reaction treatment methods, such as precipitation methods, etc.; the third is physical restoration methods, Concentration and separation of heavy metals, including reverse osmosis, evaporation concentration, etc.; the fourth category is biological restoration, such as plant microbial restoration technology. In addition to the above-mentioned methods, research on the fifth type of method - "environmental material restoration method" is also being carried out. Some of the technologies are characterized by...

Claims

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Application Information

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IPC IPC(8): B09C1/00B01J20/22B01J20/28B01J20/30
CPCB09C1/00
Inventor 范力仁
Owner CUG WUHAN GOLDEN SHIELD ENVIRONMENTAL TECH CO LTD
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