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Solidifying agent for composite heavy metal polluted soil and its preparation and application method

A technology of heavy metal polluted soil and curing agent, applied in chemical instruments and methods, restoration and application of polluted soil, etc., can solve the problems of high greenhouse gas emissions, changing soil structure, high energy consumption of cement, etc., to reduce infiltration volume, increase adsorption, good durability

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

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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 for composite heavy metal polluted soil and its preparation and application method
  • Solidifying agent for composite heavy metal polluted soil and its preparation and application method
  • Solidifying agent for composite heavy metal polluted soil and its preparation and application method

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Embodiment 1

[0027] The solidifying agent for compounding heavy metal polluted soil of the present invention is composed of the following materials in parts by mass: 45% of steel slag powder; 20% of light-burned magnesium oxide; and 35% of phosphate-activated bone powder.

[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 screened; among the obtained products, materials with a particle size of less than 2 mm are placed in an oven and dried by air flow at a temperature of 105 ° C. Dry 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 used in the present invention is not limited to the data in...

Embodiment 2

[0042] 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

[0044] 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 for compound heavy metal polluted soil as well as preparation and application methods of the curing agent. The curing agent is prepared from the following materials in percentage by mass: 40 to 65 percent of steel slag powder, 5 to 25 percent of light calcined magnesia and 20 to 45 percent of phosphate activated bone powder. The curing agent has the advantages that firstly, the curing agent can obviously reduce the mobility and the toxicity leaching amount of heavy metals in the heavy metal polluted soil, and is particularly applied to an acidic polluted land which is high in heavy metal content and contains various pollutants; after the polluted soil is repaired, the curing agent can be used as an environment-friendly material for recycling, so that the environmental risk during secondary development use of the polluted land is obviously reduced; moreover, as the raw materials are readily available, the curing agent is low in cost, easy to prepare, convenient to use and stable in effect and can be popularized and applied to curing and stabilizing repairing of the compound polluted land in a large scale.

Description

technical field [0001] The invention relates to the field of environmental geotechnical engineering, in particular to a curing agent for composite heavy metal polluted soil and a preparation and application 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 restoration of contamin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/04C09K17/08B09B3/00B09C1/08
CPCB09B3/00B09C1/08C09K17/04C09K17/08
Inventor 冯亚松杜延军夏威夷伍浩良
Owner SOUTHEAST UNIV
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