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Mortar capable of consolidating polluted soil

A technology for polluted soil and mortar, which is applied in the field of mortar that can consolidate polluted soil, and achieves the effects of low cost, simple process operation, and prevention of dissolution

Inactive Publication Date: 2021-05-14
广东碧通百年科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the shortcomings of cement solidification treatment of polluted soil through the selection and content ratio of mortar raw materials, can prevent heavy metal dissolution for a long time, and is corrosion-resistant

Method used

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  • Mortar capable of consolidating polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a kind of mortar that can consolidate polluted soil, and the method that this mortar is used for consolidating polluted soil is as follows:

[0034] S1. Take contaminated soil, add water and calcium oxide, mix and stir to adjust the pH value of the soil to about 7;

[0035] S2. Add 50 kg of high alumina cement to 150 kg of polluted soil after treatment, fully mix, then continue to add 8 kg of modified sodium bentonite, 8 kg of silica gel, 8 kg of high molecular polymer and heavy metal ion chelating agent (starch xanthate and dithiocarbamate in a mass ratio of 1:2 combination) 6kg; finally add water to stir and mix to form a slurry; wherein the water-cement ratio is about 0.2;

[0036] S3. Inject the slurry into the mold, vibrate, press and form, and then demould and dry to obtain a safe solidified body of polluted soil. Specifically, after vibrating and pressing, the cured body is left to stand for 24 to 30 hours, and then moisturized and natur...

Embodiment 2

[0039] This embodiment provides a kind of mortar that can consolidate polluted soil, and the method that this mortar is used for consolidating polluted soil is as follows:

[0040] S1. Take contaminated soil, add water and calcium oxide, mix and stir to adjust the pH value of the soil to about 7;

[0041] S2. Add 70kg of high-alumina cement to 230kg of polluted soil after treatment, fully mix, then continue to add modified sodium-based bentonite 10kg, silica gel 10kg, high molecular polymer 10kg and heavy metal ion chelating agent (starch xanthate and dithiocarbamate in a mass ratio of 1:4 combination) 10kg; finally add water to stir and mix to form a slurry; wherein the water-cement ratio is about 0.4;

[0042] S3. Inject the slurry into the mold, vibrate, press and form, and then demould and dry to obtain a safe solidified body of polluted soil. Specifically, after vibrating and pressing, the cured body is left to stand for 24 to 30 hours, and then moisturized and naturally...

Embodiment 3

[0045] This embodiment provides a kind of mortar that can consolidate polluted soil, and the method that this mortar is used for consolidating polluted soil is as follows:

[0046] S1. Take contaminated soil, add water and calcium oxide, mix and stir to adjust the pH value of the soil to about 7;

[0047] S2. Add 65kg of high-alumina cement to 200kg of contaminated soil after treatment, fully mix, then continue to add 9kg of modified sodium bentonite, 10kg of silica gel, 9kg of high molecular polymer and heavy metal ion chelating agent (starch xanthate and dithiocarbamate in a mass ratio of 1:3 combination) 10kg; finally add water to stir and mix to form a slurry; wherein the water-cement ratio is about 0.3;

[0048] S3. Inject the slurry into the mold, vibrate, press and form, and then demould and dry to obtain a safe solidified body of polluted soil. Specifically, after vibrating and pressing, the cured body is left to stand for 24 to 30 hours, and then moisturized and natu...

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Abstract

The invention discloses mortar capable of consolidating contaminated soil. The mortar is prepared from the following components in parts by weight: 50-70 parts of high-alumina cement, 8-10 parts of modified sodium bentonite, 8-10 parts of silica gel, 8-10 parts of a high-molecular polymer and 6-10 parts of a heavy metal ion chelating agent, the preparation method comprises the following steps: preparing modified sodium bentonite: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with the mesh number of 50-100 meshes; and uniformly mixing the 50-100-mesh bentonite with the sodium modifying agent and the modification additive, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain the modified bentonite. In order to solve the problem that heavy metal ions are easy to dissolve out, three substances, namely bentonite, silica gel and a heavy metal ion chelating agent, are selected, and through the combined action of the three substances, the heavy metal ions can be firmly fixed and prevented from being dissolved out. In addition, the high-alumina cement is selected, so that the problem that heavy metal ions are dissolved out due to non-corrosion resistance is relieved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and recycling in the field of environmental protection, and mainly relates to a mortar capable of consolidating polluted soil. Background technique [0002] With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution is becoming more and more serious. With the rapid development of economic globalization, pollutants containing heavy metals can enter the soil through various channels to cause soil pollution, threatening human health and environmental safety. Soil heavy metal pollution has the characteristics of concealment, long-term and irreversible. [0003] Solidification / stabilization (S / S technology) technology is one of the main methods for dealing with toxic and hazardous waste in the world. This technology is the most practical technology for the restoration of contaminated sites ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2111/00732C04B2111/00775
Inventor 朱荣朱丰谊刘毓棠曹晓飞唐东升刘勇陈军华
Owner 广东碧通百年科技有限公司
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