Agent suitable for remediation of compound heavy metal polluted soil and its production and use method

Abstract

The invention discloses an agent for restoring compound heavy metal polluted soil and a production and usage method. The agent is prepared from, by mass, 30-55% of steel slag powder, 20-50% of calcium phosphate powder and 5-30% of phosphate supported humic acid particles. The agent has the advantages that firstly, the agent can remarkably reduce the mobility of heavy metals in the heavy metal polluted soil and toxicity leaching amount and is especially applicable to acidic pollution sites high in heavy metal content and large in pollutant type number, the restored polluted soil can serve as an environmentally friendly material for resource utilization, and the environmental risk in secondary development and utilization of the pollution sites is remarkably reduced; secondly, the raw materials for the agent are easy to obtain and low in cost, the agent is simple to prepare, convenient to use and stable in effect and can be popularized and applied to fixed and stabilized restoration of compound pollution sites.

Description

technical field

[0001] The invention relates to the field of environmental geotechnical engineering, in particular to a medicament suitable for repairing composite heavy metal-contaminated 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 restoration...

Examples

Embodiment 1

[0027] The medicament suitable for repairing complex heavy metal polluted soil is composed of the following materials in parts by mass: 45% of steel slag powder; 35% of superphosphate 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 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 applicable to the present invention is not limited to the data in Table 1, ...

Embodiment 2

[0042] The preparation process and curing process are the same as in Example 1, except that the dosage of the medicament 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 dosage of the medicament is 15% (the curing agent accounts for the dry weight of the heavy metal and organic compound polluted soil).

technical field

[0001] The invention relates to the field of environmental geotechnical engineering, in particular to a medicament suitable for repairing composite heavy metal-contaminated 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 restoration...

Examples

Embodiment 1

[0027] The medicament suitable for repairing complex heavy metal polluted soil is composed of the following materials in parts by mass: 45% of steel slag powder; 35% of superphosphate 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 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 applicable to the present invention is not limited to the data in Table 1, ...

Embodiment 2

[0042] The preparation process and curing process are the same as in Example 1, except that the dosage of the medicament 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 dosage of the medicament is 15% (the curing agent accounts for the dry weight of the heavy metal and organic compound polluted soil).

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