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A method for repairing pb, zn polluted soil

A technology of polluted soil and composite materials, applied in the field of remediation of heavy metal polluted soil, can solve the problems of unable to stabilize Pb and Zn at the same time, unable to realize Pb and Zn, and limited stabilization effect, etc., to facilitate large-scale application and simple preparation process Controllable, high stable efficiency effect

Active Publication Date: 2019-03-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although in the prior art there is the use of hydroxyapatite to stabilize heavy metals, it cannot achieve the effect of simultaneously stabilizing Pb and Zn in the soil; although vermiculite also has combinations with other bacterial agents to stabilize heavy metals in the soil, but its stable The effect is limited, and it is also impossible to efficiently stabilize Pb and Zn in the soil at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Material preparation: Weigh 500g of natural vermiculite, use a rod mill to grind the natural vermiculite finely, and pass through a 400-mesh sieve to obtain vermiculite powder with a particle size of less than 38 μm. Immerse in water for 7 days to obtain vermiculite-water solution; mix natural hydroxyapatite, deionized water, and dispersant in a mass ratio of 50:50:0.1 by ball milling, and use zirconia balls as the ball milling medium. : 4 lower ball milling 10 hours, obtain hydroxyapatite hydrosol; Hydroxyapatite hydrosol and vermiculite-water solution are mixed by mass ratio 3:7, adopt high-speed disperser to disperse and leave standstill 5min, extract supernatant, at 105 Dry at °C for 12 hours to obtain a hydroxyapatite-vermiculite mixture; use zirconia balls as the ball milling medium, and ball mill for 3 hours at a ball-to-material ratio of 5:4 to obtain a hydroxyapatite-vermiculite composite material.

[0031] Soil remediation: (1) Take soil samples from the veget...

Embodiment 2

[0033] Material preparation: Weigh 500g of natural vermiculite, use a rod mill to grind the natural vermiculite finely, pass through a 400-mesh sieve to obtain vermiculite powder with a particle size of less than 38 μm, add deionized water according to the mass ratio of vermiculite to deionized water 1:2 Immerse in water for 7 days to obtain vermiculite-water solution; use ball milling method to mix natural hydroxyapatite, deionized water, and dispersant in a mass ratio of 50:60:0.4, and use zirconia balls as the ball milling medium. : 3 lower ball milling 10 hours, obtain hydroxyapatite hydrosol; Hydroxyapatite hydrosol and vermiculite-water solution are mixed by mass ratio 4:7, adopt high-speed disperser to disperse and leave standstill 5min, extract supernatant, in 105 Dry at °C for 12 hours to obtain a hydroxyapatite-vermiculite mixture; use zirconia balls as the ball milling medium, and ball mill for 3 hours at a ball-to-material ratio of 5:5 to obtain a hydroxyapatite-ver...

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Abstract

The invention discloses a method for repairing Pb and Zn polluted soil. A hydroxyapatite-vermiculite composite material is adopted to repair the Pb and Zn polluted soil. The method provided by the invention is simple, and can be used for cooperatively and efficiently stabilizing Pb and Zn in the heavy metal polluted soil.

Description

technical field [0001] The invention discloses a method for remediating Pb and Zn polluted soil, and belongs to the technical field of remediation of heavy metal polluted soil. Background technique [0002] The control of heavy metal pollution in lead-zinc mining areas has always been a hot and difficult research topic in my country. Its main environmental impact is that the tailings in mining areas and tailings dams are exposed, and the residual heavy metal ions such as Pb and Zn in them migrate with rainwater. The form pollutes the surrounding farmland and vegetable fields. [0003] Although in the prior art there is the use of hydroxyapatite to stabilize heavy metals, it cannot achieve the effect of simultaneously stabilizing Pb and Zn in the soil; although vermiculite also has combinations with other bacterial agents to stabilize heavy metals in the soil, but its stable The effect is limited, and it is also impossible to efficiently stabilize Pb and Zn in the soil at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/08
CPCB09C1/08C09K17/08
Inventor 李传常曾铃付宏渊陈荐何忠明王琼
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY