Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Chromium polluted soil remediation material

A technology for chromium-contaminated soil and remediation materials, which is applied in the restoration of polluted soil and other directions, can solve problems such as intractability, and achieve the effects of convenient production, fast reaction rate, and low dosage

Active Publication Date: 2020-03-31
江苏精炜新材料有限公司
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, because the mixed chromium slag contains a large amount of hexavalent chromium in the lattice state, it is difficult to deal with conventional reducing agents and common process conditions, which has become a difficult problem in the current chromium-contaminated site restoration and treatment projects

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
  • Chromium polluted soil remediation material
  • Chromium polluted soil remediation material
  • Chromium polluted soil remediation material

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] This specific embodiment adopts the following technical scheme: the chromium-contaminated soil remediation material is composed of the following parts by mass: CaSO 4 15%, CaS 4 21%, FeSO 4 21%, Ca(OH) 2 20%, AL(OH) 3 23%;

[0021] The preparation steps of the restoration material are as follows:

[0022] (1) Adjust the temperature of the reaction device to 110°C, and the CaSO 4 Added to the reaction device from the first feed port, CaSO 4 is 15%, then add AL(OH) to the reaction device from the second feed port 3 , Ca(OH) 2 , AL(OH) 3 23%, Ca(OH) 2 Mix and stir the three materials through the stirring shaft of the reaction device to fully react the three materials, keep the reaction temperature at 110°C, and the reaction time at 3H, CaSO 4 and AL(OH) 3 , Ca(OH) 2 The reaction produces layered double metal hydroxides;

[0023] (2) Add 21% CaS to the reaction device sequentially from the top feeding port 4 and 21% FeSO 4 , stir through the stirring shaft to...

specific Embodiment approach 2

[0026] This specific embodiment adopts the following technical scheme: the chromium-contaminated soil remediation material is composed of the following parts by mass: CaSO 4 17%, CaS 4 22%, FeSO 4 22%; Ca(OH) 2 21%, AL(OH) 3 24%;

[0027] The preparation steps of the restoration material are as follows:

[0028] (1) Adjust the temperature of the reaction device to 110°C, and the CaSO 4 Added to the reaction device from the first feed port, CaSO 4 17%, then add AL(OH) from the second feed port to the reaction device 3 , Ca(OH) 2 , AL(OH) 3 24%, Ca(OH) 2 The three materials are mixed and stirred through the stirring shaft of the reaction device to fully react the three materials, and the reaction temperature is kept at 110°C, and the reaction time is 3.5H. CaSO 4 and AL(OH) 3 , Ca(OH) 2 The reaction produces layered double metal hydroxides;

[0029] (2) Add 22% CaS to the reaction device sequentially from the top feeding port 4 and 22% FeSO 4 , stir through the st...

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 chromium polluted soil remediation material and relates to the technical field of chromium polluted soil remediation. The material is composed of, by mass, 15-18% of CaSO4, 20-23% of Ca(OH)2, 21-23% of CaS4, 21-23% of FeSO4, and 23-25% of Al(OH)3. The preparation method of the remediation material includes: adding 15-18% of CaSO4, 23-25% of Al(OH)3 and 20-23% of Ca(OH)2 into a reaction apparatus, and mixing and stirring the components for complete reaction of the three components, then keeping reaction temperature at 90-110 DEG C, performing the reaction for 3-3.5 h;adding 23-25% of CaS4 and 25-27% of FeSO4 into the reaction apparatus and fully stirring and mixing the materials, then maintaining the temperature for 1-1.5 h; feeding the mixture in the reaction apparatus into a flash dryer for drying to obtain the powdery soil remediation material. The material is low in addition quantity, is high in reaction rate, has stable and good remediation effect and isconvenient to prepare.

Description

technical field [0001] The invention relates to the technical field of remediation of chromium-contaminated soil, in particular to a remediation material for chromium-contaminated soil. Background technique [0002] Chromium slag (solid waste containing chromium) has become an important environmental problem of chromium pollution. The chromium that enters the soil due to weathering is easily oxidized into soluble compound anions, and then transferred to surface water or groundwater by leaching. When there is too much chromium in the soil, it will inhibit the nitrification of organic matter and cause chromium to accumulate in plants. Contaminated soil in chromium slag sites can usually be divided into three categories: heavily polluted surface layer of slag-soil mixture (with a small amount of chromium slag mixed in it), heavily polluted soil layer without chromium slag, and lightly polluted soil layer. At present, chemical reducing agents are mainly used for remediation of ...

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): B09C1/08
CPCB09C1/08
Inventor 张剑宇郑南峰吴春江佘卫民
Owner 江苏精炜新材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com