A kind of calcium-based liquid solidifying agent and method for fixing vanadium-contaminated soil in situ

A liquid curing agent, in-situ fixation technology, applied in chemical instruments and methods, soil conditioning materials, other chemical processes, etc., can solve the problems of less research on vanadium, soil pollution, excessive heavy metals associated with it, and achieve uniform distribution and environmental friendliness. , the effect of simple construction

Active Publication Date: 2018-02-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium discharged into the water body and the atmosphere is often collected in the soil eventually, and the leachate of vanadium slag will also increase the vanadium content of the soil, eventually causing vanadium pollution in the soil
In addition, heavy metals such as Cr, Cd, Pb, Cu, and Zn are associated with stone coal, which will also lead to excessive heavy metals in the soil.
[0004] Vanadium poses health risks to the human body, and the mining and processing of vanadium mines have also caused soil pollution. However, there are few studies on vanadium at present, and vanadium slag is not included in the "National Hazardous Waste List". Soil remediation literature reports

Method used

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  • A kind of calcium-based liquid solidifying agent and method for fixing vanadium-contaminated soil in situ
  • A kind of calcium-based liquid solidifying agent and method for fixing vanadium-contaminated soil in situ

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A calcium-based liquid curing agent, comprising 40.0 parts of curing agent A and 1.0 parts of curing agent B, curing agent A is prepared by mixing slaked lime with water at a mass ratio of 1.0:50.0, and curing agent B has a content of 40.0% Industrial grade sodium silicate, said parts are parts by mass;

[0024] The method for in-situ fixation of vanadium-contaminated soil by the calcium-based liquid solidifying agent comprises the following steps:

[0025] 1) Stir and mix curing agent A and curing agent B according to the mass parts of 40.0 parts and 1.0 parts;

[0026] 2) For surface vanadium-contaminated soil with a pollution depth within 20.0cm, spray the mixed slurry in step 1) evenly into the soil, and the spraying rate is 220.0L / m 2 , and mixed with plowing, the depth of plowing is 20.0cm, plowing 3 times, watering from time to time, keeping the moisture content at 20.0%, and maintaining for 5 days.

Embodiment 2

[0028] A calcium-based liquid curing agent, comprising 30.0 parts of curing agent A and 1.0 parts of curing agent B, curing agent A is made by mixing calcium chloride with water at a mass ratio of 1.0:25.0, and curing agent B has a content of 50.0 parts % of industrial grade sodium silicate, the parts are parts by mass;

[0029] The method for in-situ fixation of vanadium-contaminated soil by the calcium-based liquid solidifying agent comprises the following steps:

[0030] 1) Stir and mix curing agent A and curing agent B according to the mass parts of 30.0 parts and 1.0 parts;

[0031] 2) For surface vanadium-contaminated soil with a pollution depth within 20.0cm, spray the mixed slurry in step 1) evenly into the soil, and the spraying rate is 200.0L / m 2 , and mixed with plowing, the depth of plowing is 15.0cm, plowing 3 times, watering from time to time, keeping the moisture content at 30.0%, and maintaining for 5 days.

Embodiment 3

[0033] A calcium-based liquid curing agent, comprising 34.0 parts of curing agent A and 1.0 parts of curing agent B, curing agent A is made by mixing calcium dihydrogen phosphate with water at a mass ratio of 1.0:25.0, and curing agent B is the content 45.0% industrial grade sodium silicate, said parts are parts by mass;

[0034] The method for in-situ fixation of vanadium-contaminated soil by the calcium-based liquid solidifying agent comprises the following steps:

[0035] 1) Stir and mix curing agent A and curing agent B according to the mass parts of 34.0 parts and 1.0 parts;

[0036] 2) For surface vanadium-contaminated soil with a pollution depth within 20.0cm, spray the mixed slurry in step 1) evenly into the soil, and the spraying rate is 180.0L / m 2 , and mixed with plowing, the depth of plowing is 18.0cm, plowing 3 times, watering from time to time, keeping the moisture content at 25.0%, and maintaining for 5 days.

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Abstract

The invention discloses a calcium-based liquid curing agent and a vanadium-polluted soil in-situ immobilization method. The calcium-based liquid curing agent comprises 30.0-40.0 parts of a curing agent A and 0.5-1.0 part of a curing agent B. The curing agent A is prepared from slaked lime, calcium chloride or calcium dihydrogen phosphate, and water by mixing. The curing agent B is industrial grade sodium water glass with content of 40.0-50.0%. The vanadium-polluted soil in-situ immobilization method utilizing the calcium-based liquid curing agent comprises 1, mixing the curing agent A and the curing agent B by stirring on the scene, wherein the mass ratio of the used curing agents to the soil is in a range of 30.0-40.0%, and 2, uniformly spraying the mixed slurry into soil of which surface is polluted by vanadium, carrying out mixing by a plow, punching soil of which the deep layer is polluted by vanadium, and injecting the mixed slurry into the holes in the soil of which the deep layer is polluted by vanadium. The calcium-based liquid curing agent has the characteristics of full reaction, simple construction and acidic soil applicability.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a calcium-based liquid solidifying agent and a method for in-situ fixing vanadium-contaminated soil. technical background [0002] Because it can greatly improve the strength, toughness, ductility and heat resistance of steel, as an additive, a large amount of vanadium V is used in the steel industry. The average vanadium content in the soil is only 0.01%, which is very close to the content in the surface of the earth’s crust and the weathered rocks that form the soil. The vanadium content in the soil in the densely distributed areas of vanadium-bearing ores and iron oxide generally exists in the form of insoluble salts . [0003] Vanadium is an essential nutrient element for some animals, and also plays an important role in various enzymatic reactions in plants, but at the same time, vanadium compounds also have strong toxicity a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/12C09K101/00C09K109/00
CPCC09K17/12C09K2101/00C09K2109/00
Inventor 蒋建国李天然李德安王佳明
Owner TSINGHUA UNIV
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