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Heavy metal polluted soil solidification and repairing composite compound and solidification and repairing method

A technology for compounding chemicals and heavy metals, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problem that heavy metal-contaminated soil cannot be stabilized for a long time, avoid secondary dissolution, and increase long-term stability. , the effect of low cost

Active Publication Date: 2020-01-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem that the heavy metal-contaminated soil repaired by the existing curing agent cannot be solidified stably for a long time, the present invention provides a composite medicament for soil heavy metal pollution curing and restoration, which can effectively enhance the long-term stability of the solidification of heavy metal-contaminated soil; The invention also provides a method for solidifying and repairing heavy metal-contaminated soil by using the composite agent

Method used

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  • Heavy metal polluted soil solidification and repairing composite compound and solidification and repairing method
  • Heavy metal polluted soil solidification and repairing composite compound and solidification and repairing method
  • Heavy metal polluted soil solidification and repairing composite compound and solidification and repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Soil heavy metal pollution solidification and restoration composite agent formula:

[0027] Quicklime 20%, iron-based biochar modified superphosphate 80%.

[0028] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:

[0029] The biomass is washed, dried, ground, passed through a 2mm sieve, and placed in a beaker. The mass ratio of iron salt to biomass is 0.2:1. Add iron salt and water, stir for 2 hours, and dry for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2 Under atmosphere, bake at 600°C for 60min.

[0030] The prepared iron-based biochar-modified superphosphate and quicklime are dry-mixed evenly according to the mass ratio of 4:1 to obtain the compound agent.

Embodiment 2

[0032] Soil heavy metal pollution solidification and restoration composite agent formula:

[0033] Quicklime 30%, iron-based biochar modified superphosphate 70%.

[0034] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:

[0035] The biomass is washed, dried, ground, passed through a 2mm sieve, and placed in a beaker. The mass ratio of iron salt to biomass is 0.5:1. Add iron salt and water, stir for 2 hours, and dry for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2 Under atmosphere, bake at 800°C for 60min.

[0036] Dry mix the prepared iron-based biochar-modified superphosphate and quicklime according to the mass ratio of 7:3 to obtain the compound agent.

Embodiment 3

[0038] Soil heavy metal pollution solidification and restoration composite agent formula:

[0039] Quicklime 40%, iron-based biochar modified superphosphate 60%.

[0040] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:

[0041] Wash the biomass, dry it, grind it, put it in a beaker after passing through a 2mm sieve, add the iron salt and water at a mass ratio of 0.8:1 between the iron salt and the biomass, stir for 2 hours, and dry it for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2Baking under atmosphere at 900°C for 120min.

[0042] Dry mix the prepared iron-based biochar-modified superphosphate and quicklime according to the mass ratio of 3:2 to obtain the compound agent.

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Abstract

The invention discloses a heavy metal polluted soil solidification and repairing composite compound and a solidification and repairing method. The composite compound comprises the following componentsin percentage by mass: 20-40% of quicklime and 60-80% of an iron-based biochar modified phosphate mineral, wherein the iron-based biochar modified phosphate mineral is obtained by uniformly mixing and drying an iron salt and biomass, further mixing the mixture with a phosphate mineral uniformly and performing co-pyrolysis. The method for solidifying and repairing heavy metal polluted oil by usingthe composite compound comprises the following steps: firstly, uniformly mixing the iron-based biochar modified phosphorate mineral with quicklime so as to obtain the heavy metal polluted soil solidification and repairing composite compound; applying the composite compound into heavy metal polluted soil, adding water, and performing uniform stirring; and performing maintenance of the best standards, so as to complete solidification repairing on the heavy metal polluted soil. By adopting the heavy metal polluted soil solidification and repairing composite compound, secondary dissolution of heavy metals can be greatly avoided, and the long-term stability of solidification of the heavy metal polluted soil can be greatly enhanced.

Description

technical field [0001] The invention relates to a soil heavy metal pollution solidification and restoration compound agent and a method for solidifying and repairing heavy metal polluted soil by using the agent, belonging to the technical field of soil restoration and treatment. Background technique [0002] Soil is an important part of the ecological environment and the main natural resource for human survival. In the process of rapid industrialization in my country, due to the unsound environmental management model and the slack pollution control system, long-term industrial production activities, such as electroplating, smelting and other industries, have discharged a large amount of heavy metal pollutants into the soil, making a large area of ​​my country's soil is being Suffering from serious pollution problems; soil pollution is concealed and delayed, and reasonable and effective measures must be taken to reduce the environmental risks brought by pollutants. Combining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08B09C1/00C09K109/00
CPCB09C1/00B09C1/08B09C2101/00C09K17/06C09K2109/00
Inventor 宋敏赵炎于磊
Owner SOUTHEAST UNIV
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