Heavy-metal-polluted acidic soil repairing material as well as preparation method and application thereof

A technology of acidic soil and remediation materials, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of difficult disposal of solid waste from biomass power plants and difficult resource utilization of biomass power plant ash , to achieve the effect of low cost of repair materials and repair process, simple and easy repair measures, and wide sources

Active Publication Date: 2012-01-25
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous development of the biomass power generation industry, it has also brought about thorny issues such as the difficulty in h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of raw materials for each component of the present invention: biomass power plant ash is selected from boiler fly ash collected by bag filter after burning agricultural and forestry solid waste; slag powder, steel slag powder, fly ash and bentonite are purchased materials.

[0029] The preparation method of the restoration material of the present invention comprises the following steps:

[0030] 1) Drying: Dry the biomass power plant ash, slag powder, steel slag powder, fly ash and bentonite until the moisture content is equal to 0.9%, so as to maintain the inherent activity of each component raw material.

[0031] 2) Ingredients: Take 10kg of biomass power plant ash, 20kg of slag powder, 20kg of steel slag powder, 10kg of fly ash, and 40kg of bentonite according to the weight ratio, and transport them to the mixing bin.

[0032] 3) Stirring: Stir the above-mentioned raw materials evenly with a gravity-free stirrer, and control the stirring time to 120 secon...

Embodiment 2

[0037] The preparation of each component raw material of the present invention is identical with embodiment 1.

[0038] The preparation method of the restoration material of the present invention comprises the following steps:

[0039] 1) Drying: Dry the biomass power plant ash, slag powder, steel slag powder, fly ash and bentonite until the moisture content is equal to 0.8%, so as to maintain the inherent activity of each component raw material.

[0040] 2) Ingredients: Take 15kg of biomass power plant ash, 15kg of slag powder, 15kg of steel slag powder, 8kg of fly ash, and 42kg of bentonite according to the weight ratio, and transport them to the mixing bin.

[0041] 3) Stirring: Stir the above-mentioned raw materials evenly with a gravity-free stirrer, and control the stirring time to 180 seconds to obtain the repair material of the present invention.

[0042] A specific method for in-situ restoration of acidic soil polluted by heavy metals using the above restoration materi...

Embodiment 3

[0046] The preparation of each component raw material of the present invention is identical with embodiment 1.

[0047] The preparation method of the restoration material of the present invention comprises the following steps:

[0048] 1) Drying: Dry the biomass power plant ash, slag powder, steel slag powder, fly ash and bentonite until the moisture content is equal to 0.5%, so as to maintain the inherent activity of each component raw material.

[0049] 2) Ingredients: Take 12kg of biomass power plant ash, 15kg of slag powder, 22kg of steel slag powder, 9kg of fly ash, and 42kg of bentonite according to the weight ratio, and transport them to the mixing bin.

[0050] 3) Stirring: Stir the above-mentioned raw materials evenly with a gravity-free stirrer, and control the stirring time to 150 seconds to obtain the repair material of the present invention.

[0051] A specific method for in-situ restoration of acidic soil polluted by heavy metals using the above restoration mate...

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Abstract

The invention discloses a heavy-metal-polluted acidic soil repairing material as well as a preparation method and application thereof. The repairing material is prepared from the following raw materials in percentage by weight: 10-20% of biomass electric power plant ash, 10-20% of slag powder, 10-30% of steel slag powder, 5-10% of fly ash and 25-50% of bentonite by uniformly mixing in a dry powder state. The preparation method comprises the following steps of: firstly, drying the raw materials until the water content is smaller than or equal to 1%; then, respectively weighing the raw materials according to the percentage by weight; and finally, uniformly stirring. The in-situ repairing of heavy-metal-polluted acidic soil is achieved by covering a layer of repairing material on the soil surface, uniformly mixing the soil surface layer with the repairing material in plowing and stirring modes, and detecting the contents of Cd, Pb, Cr, Cu, Zn, Mn, Hg, As and Ni in the repaired soil and the soil pH value after 3-6 months until meeting the requirements of the second-level soil environment quality standard in GB15618-1995.

Description

technical field [0001] The invention relates to soil in-situ repair materials in the field of agriculture and forestry, in particular to a heavy metal-polluted acidic soil repair material and its preparation method and application. Background technique [0002] Acidic soil is the general term for soil with a pH value less than 7. In my country's tropical and subtropical regions, various red or yellow acidic soils are widely distributed. The local temperature is high and the rainfall is large, with the annual rainfall mostly above 1500mm. The characteristics of high temperature, rainy season, and hot and humid seasons make the weathering and pedogenesis of the soil very strong, and the cycle of biomass is very rapid. Because the salt base in the soil is highly unsaturated, its pH value is generally maintained between 4.5 and 6. At the same time, due to the obvious accumulation of iron and aluminum oxides, the soil is sour and lean. A serious problem in acidic soils is low ...

Claims

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Application Information

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IPC IPC(8): C09K17/02B09C1/08A62D3/33C09K109/00C09K101/00A62D101/24
Inventor 薛永杰张岩丰李江川方章建陶磊明
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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