Compound chelating agent for stabilizing soil heavy metal

A technology of heavy metals and chelating agents, which is applied in the direction of soil conditioning materials, fertilizer mixtures, organic fertilizers, etc., can solve the problems of limited types of heavy metals, increased costs, and difficulty in long-term maintenance, so as to avoid secondary pollution problems, improve stability, good stabilizing effect

Inactive Publication Date: 2017-06-13
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for in-situ remediation of heavy metal-contaminated soil. Considering the reuse of soil, the monomeric chelating agent or solidification material has the following disadvantages: it is narrow to adapt to the pH range, and most of them are strongly alkaline, which is not only relatively weak after remediation. It is difficult to maintain for a long time, and the alkaline environment has a great impact on the cultivation of plants in the repaired soil and the ecological environment around the repaired soil; the types of heavy metals removed are limited, and the general monomer chelating agent can only solidify part of the heavy metals; it is unstable and susceptible to changes in environmental conditions cause secondary pollution
Patent CN 102517026B is a compound chelating agent used to treat lead-contaminated sites containing organic matter. Although it can repair heavy metal lead-contaminated sites under the influence of organic matter, its treatment of heavy metal pollution is limited
Patent CN105498146 A is a two-component heavy metal stabilizer used to treat incineration fly ash. Although it can effectively remove heavy metals such as Pb and Cd in fly ash, the components need to increase the activation of heavy metals and alkaline substances. Adds formulation complexity and increases cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compound chelating agent for stabilizing soil heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present embodiment provides a kind of stable soil heavy metal complex chelating agent, is made by the component mixing of following percentage by weight: 8% dibutyl ammonium dithiophosphate, 16% potassium dihydrogen phosphate, 16% sulfide trapping agent and 60% deionized water.

[0021] In this embodiment, dibutyl ammonium dithiophosphate can also be other dihydrocarbyl disulfides such as ammonium diisopropyl dithiophosphate, potassium dipropyl dithiophosphate, potassium diisopropyl dithiophosphate, etc. Phosphates.

[0022] In this embodiment, potassium dihydrogen phosphate may also be other soluble phosphates such as sodium dihydrogen phosphate, diammonium phosphate, and the like.

[0023] Wherein, the preparation process of the sulfide trapping agent is as follows: step 1, put sulfur and silicic acid in a constant temperature water bath at 25°C, add 20% aluminum sulfate solution by mass percentage, and stir for 0.5h. Step 2: Add sodium hydroxide, raise the temp...

Embodiment 2

[0026] The present embodiment provides a stable soil heavy metal complex chelating agent, which is made by mixing the following components in percentage by weight: 9% ammonium diisopropyl dithiophosphate, 15.5% sodium dihydrogen phosphate, 15.5% sulfide trapping agent and 60% deionized water.

[0027] In this embodiment, diisopropyl ammonium dithiophosphate can also be dibutyl ammonium dithiophosphate, potassium dipropyl dithiophosphate, potassium diisopropyl dithiophosphate and other dihydrocarbyl disulfide Phosphates.

[0028] In this embodiment, sodium dihydrogen phosphate may also be potassium dihydrogen phosphate, diammonium phosphate and other soluble phosphates.

[0029] Wherein, the preparation process of the sulfide trapping agent is as follows: step 1, put sulfur and silicic acid in a constant temperature water bath at 30° C., add aluminum sulfate solution with a mass percentage of 25%, and stir for 1 hour. Step 2: Add sodium hydroxide, raise the temperature to 75°...

Embodiment 3

[0032] The present embodiment provides a kind of stable soil heavy metal complex chelating agent, is made by the component mixing of following percentage by weight: 6% potassium dipropyl dithiophosphate, 17% diammonium phosphate, 17% sulfide trapping agent and 60% %Deionized water.

[0033] In this embodiment, potassium dipropyl dithiophosphate can also be dibutyl ammonium dithiophosphate, ammonium diisopropyl dithiophosphate, potassium diisopropyl dithiophosphate and other dihydrocarbyl disulfide Phosphates.

[0034] In this embodiment, the diammonium phosphate may also be potassium dihydrogen phosphate, sodium dihydrogen phosphate and other soluble phosphates.

[0035] Wherein, the preparation process of the sulfide trapping agent is as follows: step 1, put sulfur and silicic acid in a constant temperature water bath at 27°C, add 22% aluminum sulfate solution by mass percentage, and stir for 0.5h. Step 2: Add sodium hydroxide, raise the temperature to 72° C., stir well to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a compound chelating agent for stabilizing soil heavy metal. The compound chelating agent is prepared by mixing the following components by weight percent: 5%-9% of dialkyldithiophosphate, 10%-18% of soluble phosphate, 10%-18% of sulfide collector and 55%-75% of deionized water. The compound chelating agent has an excellent stabilizing effect for various heavy metals in soil, especially, Pb, Hg, Cd and Cu. The stabilizing efficiency can reach up to 99% or above.

Description

technical field [0001] The invention belongs to the field of soil heavy metal restoration, and relates to a chelating agent, in particular to a compound chelating agent for stabilizing soil heavy metals. Background technique [0002] Soil heavy metal chemical immobilization technology is mainly to add chelating agents or immobilization materials to the soil, and through a series of reactions such as adsorption, precipitation, complexation, ion exchange, and redox, to reduce the bioavailability and mobility of heavy metals in soil. This method is suitable for in-situ remediation of heavy metal-contaminated soil. Considering the reuse of soil, the monomeric chelating agent or solidification material has the following disadvantages: it is narrow to adapt to the pH range, and most of them are strongly alkaline, which is not only relatively weak after remediation. It is difficult to maintain for a long time, and the alkaline environment has a great impact on the cultivation of pl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 赵九娟夏辉鹏张金山夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap