Steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil

A technology of soil curing agent and desulfurized gypsum, which is applied in the field of soil in-situ curing agent, can solve the problems of high cement volume increase ratio, reduced toxicity of arsenic leaching, and no treatment method, so as to reduce costs, improve curing efficiency, reduce The effect of blending amount

Inactive Publication Date: 2017-03-01
WUHAN UNIV
View PDF1 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is not difficult to see from the existing research on the solidification of arsenic slag that among the solidifying agents represented by cement and lime, although the leaching toxicity of arsenic after the cement solidifies the arsenic is greatly reduced, the cement content generally exceeds 50%, or even reaches 70%. Excessive cement content not only makes the volume expansion ratio too high after curing, but also makes it difficult to handle
Moreover, one of the reasons for the reduced toxicity of arsenic leaching is likely to be the result of dilution by adding cement
[0005] In view of the existence of a large amount of arsenic-containing waste residue and arsenic-containing soil, and there is no feasible treatment method, it is still mainly stockpiled, which has serious environmental pollution risks. It is urgent to invent a new type of stabilizing material to solidify arsenic-containing waste residue

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
  • Steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil
  • Steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil
  • Steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of soil stabilizer:

[0046] Weigh 40% steel slag, 25% desulfurized gypsum, 25% slag, 7% clinker and 3% activator by mass percentage. Use a ball mill to grind the steel slag until the fineness is no more than 80 μm, and the sieve allowance is no more than 3.5%; add desulfurized gypsum, slag, cement clinker and activator to continue grinding until the fineness of the mixture is no more than 80 μm, and the sieve allowance is no more than 3.5%. More than 1.5%, that is to obtain soil stabilizer.

[0047] (2) Remediation of arsenic-contaminated soil:

[0048] Mix the soil curing agent and the arsenic-contaminated soil evenly, control its water content to 17%, and compact it by rolling to make the density reach more than 95%.

[0049] (3) Curing effect test:

[0050] Take the solidified samples that were cured for 14 days, 28 days, 56 days, and 90 days respectively to prepare the leachate according to the standard of "Solid Waste Leaching Toxicity Leaching ...

Embodiment 2

[0054] (1) Preparation of soil stabilizer:

[0055] Weigh 43% steel slag, 15% desulfurized gypsum, 30% slag, 9% clinker and 3% activator by mass percentage. Use a ball mill to grind the steel slag until the fineness is not more than 80 μm, and the sieve allowance is not more than 3.5%; add the desulfurized gypsum, slag, cement clinker and activator after grinding and continue grinding until the fineness of the mixture is not more than 80 μm, If the sieve residue is not more than 1.5%, the soil stabilizer is obtained.

[0056] (2) Remediation of arsenic-contaminated soil:

[0057] Mix the soil curing agent and the arsenic-contaminated soil evenly, control its water content to 17%, and compact it by rolling to make the density reach more than 95%.

[0058] (3) Curing effect test:

[0059] Take the solidified samples that were cured for 14 days, 28 days, 56 days, and 90 days respectively to prepare the leachate according to the standard of "Solid Waste Leaching Toxicity Leachi...

Embodiment 3

[0063] (1) Preparation of soil stabilizer:

[0064] Weigh 45% steel slag, 20% desulfurized gypsum, 22% slag, 10% clinker and 3% activator by mass percentage. Use a ball mill to grind the steel slag until the fineness is not more than 80 μm, and the sieve allowance is not more than 3.5%; add the desulfurized gypsum, slag, cement clinker and activator after grinding and continue grinding until the fineness of the mixture is not more than 80 μm, If the sieve residue is not more than 1.5%, the soil stabilizer is obtained.

[0065] (2) Remediation of arsenic-contaminated soil:

[0066] Mix the soil curing agent and the arsenic-contaminated soil evenly, control its water content to 17%, and compact it by rolling to make the density reach more than 95%.

[0067] (3) Curing effect test:

[0068] Take the solidified samples that were cured for 14 days, 28 days, 56 days, and 90 days respectively to prepare the leachate according to the standard of "Solid Waste Leaching Toxicity Leach...

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 steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil. The soil solidification agent contains the ingredients in percentage by weight: 40% to 45% of steel slag, 15% to 25% of desulfurized gypsum, 22% to 30% of slag, 7% to 10% of cement clinker and 3% of excitant. According to the soil solidification agent disclosed by the invention, arsenic is solidified and stabilized mainly by means of chemical wrapping and in-phase replaced solidifying, and the age of a solidifying reaction can be shortened and the mixed amount of the solidification agent and solidified volume increase ratio in engineering applications can be lowered while a solidifying effect is guaranteed, so that the solidifying efficiency is increased greatly.

Description

technical field [0001] The invention belongs to the technical field of soil in-situ curing agents, and in particular relates to a steel slag desulfurization gypsum-based soil curing agent suitable for arsenic-polluted soil. Background technique [0002] Arsenic and its compounds are a toxic pollutant harmful to the environment and organic organisms [1-2] , the US Centers for Disease Control (CDC) and the International Agency for Research on Cancer (LARC) have designated arsenic as a first-class carcinogen, which can mainly cause skin cancer, bladder cancer, liver cancer, etc. [3] , is one of the toxic elements that are prioritized to be controlled in the environment. The 2010 Yearbook of the United States shows that China's production of arsenic trioxide is about 25,000 tons, making it the world's largest producer. The United States is the largest importer of arsenic alloys and As 2 o 3 The second importing country is China. Liao X Y etc. [4] It was found that the arse...

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): C09K17/10B09C1/08
Inventor 周旻汪韦兴王小书侯浩波耿军军王腾周显吕熠
Owner WUHAN UNIV
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