Curing agent for stabilizing heavy metal lead pollution area containing organic matter

Abstract

The invention discloses a curing agent for stabilizing a heavy metal lead pollution area containing organic matter. The curing agent is composed of the following components including, by weight, 33%-40% of phosphate, 33%-40% of graining blast furnace slag and 20%-34% of magnesium oxide. The curing agent can be used during in-situ processing of the heavy metal pollution area containing organic matter pollution and is remarkable in curing effects, pH value of the pollution area is low after treatment by the curing agent, and corrosivity is small. Besides, the pollution area has high strength after treatment and can be directly used as a shallow-layer foundation, and the curing agent is environment-friendly and low in cost simultaneously.

Description

technical field [0001] The invention relates to a curing agent used in civil engineering or road engineering, in particular to a curing agent used for stabilizing heavy metal lead-contaminated sites containing organic matter. Background technique [0002] Solidification / Stabilization is to mix waste with cementitious materials (cementing agent, curing agent), and at the same time reduce the leaching ability of pollutants and improve the strength of soil by physical and chemical means, so as to convert harmful substances into Environmentally acceptable material. This method is suitable for in-situ remediation of heavy metal-contaminated sites. However, many heavy metal-contaminated sites have organic pollution, which makes traditional cement curing agents have the following disadvantages: [0003] (1) Due to the presence of organic matter, it will interfere with the cement hydration process and cause a hysteresis effect on the curing effect of Portland cement, including chem...

AI Technical Summary

Problems solved by technology

Firstly, it is difficult to maintain the highly alkaline environment of the soil, and it is difficult to maintain the strength of the restored soil for a long time; secondly, because microorganisms that degrade polluted organic matter are difficult to survive in a strongly alkaline environment, if the contaminated site exists at the same time Heavy metal and organic matter pollution, the curing effect will be greatly reduced by the impact of polluted organic matter; finally, the high alkaline environment will also have a great impact on the restored soil cultivation plants and the ecological environment around the site

[0005] (3) With the increase of time, the carbonization effect of cement soil will become more and more obvious, and its mechanical performance will be greatly reduced until the soil structure is destroyed

To achieve a good curing effect during construction, a higher cement content is required, which undoubtedly increases the cost

Images