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Solidifying agent suitable for strongly acidic composite heavy metal polluted soil and its production and use method

A technology of heavy metal polluted soil and curing agent, which is applied in the direction of chemical instruments and methods, applications, fertilizer mixtures, etc., can solve the problems of high greenhouse gas emissions, changes in soil structure, and high energy consumption of cement, so as to reduce infiltration, strengthen The ability to absorb carbon dioxide and the effect of good durability

Active Publication Date: 2020-09-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used curing agents mainly include materials such as cement, lime, and phosphate, which have a good effect on the solidification and stabilization of heavy metals, but there are also a large number of disadvantages, such as high energy consumption for cement production and high greenhouse gas emissions; lime and phosphate are Non-renewable natural minerals, high cost, etc.; and a large amount of phosphate will seriously change the soil structure and further cause phosphorus pollution of groundwater and surface water

Method used

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  • Solidifying agent suitable for strongly acidic composite heavy metal polluted soil and its production and use method
  • Solidifying agent suitable for strongly acidic composite heavy metal polluted soil and its production and use method
  • Solidifying agent suitable for strongly acidic composite heavy metal polluted soil and its production and use method

Examples

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Effect test

Embodiment 1

[0027] The invention is suitable for the curing agent of strongly acidic composite heavy metal polluted soil, and consists of the following materials in parts by mass: 45% of steel slag powder; 35% of quicklime powder; and 20% of humic acid powder loaded with phosphate.

[0028] The steel slag powder is activated steel slag powder prepared by the following method: the converter slag is subjected to magnetic separation and then crushed and sieved; among the obtained products, materials with a particle size of less than 2mm are placed in an oven and dried by air flow at a temperature of 105°C until the water content is 1%; the obtained product is ground and passed through a 200-mesh sieve, and then calcined in an electric furnace at 700° C. for 2 hours. The basicity value of the steel slag powder is 2.07.

[0029] The main components and content of the steel slag are shown in Table 1. It should be noted that the steel slag applicable to the present invention is not limited to th...

Embodiment 2

[0043] The preparation process and curing process are the same as in Example 1, except that the dosage of the curing agent is 10% (the curing agent accounts for the dry weight of the heavy metal and organic compound polluted soil).

Embodiment 3

[0045] The preparation process and curing process are the same as in Example 1, except that the amount of curing agent is 15% (the curing agent accounts for the dry weight of the heavy metal and organic compound polluted soil).

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Abstract

The invention discloses a curing agent applicable to strong acidic compound heavy metal polluted soil as well as production and application methods. The curing agent is prepared from the following materials in percentage by mass: 30 percent to 55 percent of steel slag powder, 20 percent to 50 percent of quicklime powder and 5 percent to 30 percent of phosphate-loaded humic acid powder particles. The curing agent disclosed by the invention has the advantages that firstly, the migration property of heavy metal and toxin leaching quantity in the heavy metal polluted soil can be remarkably reduced; especially, the curing agent is applicable to an acidic polluted site with high heavy metal content and more pollutant types; after the polluted soil is repaired, the soil can be used as an environment-friendly type material for recycling; environment risks caused by secondary development and utilization of the polluted site are remarkably reduced; meanwhile, the curing agent has the advantages of easiness of obtaining the raw materials, low cost, simplicity in preparation, convenience for utilization and stable effect, and can be popularized and applied to curing and stabilized repairing of the compound polluted site in a large scale.

Description

technical field [0001] The invention relates to the field of environmental geotechnical engineering, in particular to a curing agent suitable for strongly acidic composite heavy metal polluted soil and a production and use method. Background technique [0002] With the adjustment of urban functions and urban layout in our country, enterprises originally located in urban centers and suburbs, such as chemical plants, metal smelting plants, and electroplating plants, have gradually shut down or retreated from cities to parks. However, the production process of industries and enterprises for many years , A large amount of pollutants have accumulated in the land left after their relocation, which not only brings resistance to the efficient use of the leftover land, but also brings serious safety hazards to the surrounding environment. In recent years, the "Soil Pollution Prevention and Control Action Plan" (Soil Ten Articles) promulgated by the government also regards the restora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 冯亚松杜延军夏威夷伍浩良
Owner SOUTHEAST UNIV
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