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A passivation material for repairing cadmium-copper polluted acidic soil and its preparation method and application

A technology of acidic soil and cadmium copper, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., to achieve the effect of improving soil pH, improving product quality, and convenient application

Active Publication Date: 2019-06-14
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem to be solved: In view of the shortcomings and problems existing in the above technologies and researches, the present invention provides a passivation material for repairing cadmium copper polluted acidic soil and its preparation method and application

Method used

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  • A passivation material for repairing cadmium-copper polluted acidic soil and its preparation method and application
  • A passivation material for repairing cadmium-copper polluted acidic soil and its preparation method and application
  • A passivation material for repairing cadmium-copper polluted acidic soil and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The formula screening experiment of embodiment 1 passivation material

[0031] Soil was collected in a typical cadmium-copper polluted acidic soil farmland. Farmland soil was used as the control (CK), and the passivation material treatment included the application of biomass power plant ash (D). The biomass power plant ash was mixed with lime (DS) and apatite (DL) in a mass ratio of 3:1. The mass ratio of ash, lime and phosphorite was 6:1:1 (DLS), and there were 5 treatments in total, and each treatment was repeated 3 times. Pass the air-dried polluted soil through a 10-mesh sieve, add 2 g of treatment materials per 1 kg of soil, that is, each treatment material accounts for 0.2% of the soil mass, and mix evenly. Constant temperature and humidity (temperature 25°C, humidity 40%) cultured for 77 consecutive days, samples were taken for analysis every 7 days, and the results showed that: on the 14th day, the soil pH increased the most with DS treatment, followed by DLS t...

Embodiment 2

[0032] Embodiment 2 Particle size selection experiment

[0033] Use the centrifugal granulator and rounder to control the temperature of 50℃~60℃, rotational speed 20r / min, moisture 40%, and no binder or any colloid to form the screened passivation material, resulting in 0mm~1mm, 1mm~ 2mm, 2mm~3mm, 3mm~4mm, 4mm~5mm, >5mm six kinds of passivation materials. Weigh 5g of passivation materials with 6 particle sizes, place them in 100mL deionized water, and incubate at a constant temperature of 25°C. and 77d to measure the solution pH ( figure 2 ), and the base ions (K + 、Na + , Ca 2+ and Mg 2+ )content( image 3 ).

[0034] The results showed that the pH value gradually increased with time, the larger the particle size, the smaller the pH value, and the pH value of all particle sizes was always maintained at 11.1-11.9. At the 3rd hour, there was no significant difference in the pH values ​​of 4mm~5mm and >5mm particle sizes, and the difference was significant with other pa...

Embodiment 3

[0035] The preparation of embodiment 3 passivation material

[0036] 1. Passivation material formula: prepared from biomass power plant ash, lime and apatite, without adding any binder, and the mass percentage of each material is: 70wt.%≤biomass power plant ash≤80wt.%, 10wt.%≤lime≤15wt.%, 10wt.%≤phospholime≤15wt.%, pH 12.0, particle size≤3mm.

[0037] 2. Preparation of passivation material includes the following steps:

[0038] 1) Dry raw materials: dry the raw materials of each component until the moisture content is not higher than 1%, so as to maintain the inherent activity of the raw materials of each component;

[0039] 2) Sieving: all materials are passed through a 60-mesh sieve so that the materials can be evenly mixed;

[0040] 3) Ingredients: Weigh out each material according to the mass ratio mentioned above, place them in a blender, and stir for 2-3 minutes to mix evenly;

[0041] 4) Granulation: use a centrifugal granulator and a rounding machine to control the ...

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Abstract

The invention provides a passivation material capable of repairing cadmium and copper-polluted acidic soil as well as a preparation method and application of the passivation material. The pH value of the passivation material is 10 to 13; the passivation material is prepared from the following raw materials in percentage by mass: more than or equal to 60 percent and less than or equal to 85 percent of biomass power plant ash, more than or equal to 10 percent and less than or equal to 25 percent of lime, and more than or equal to 5 percent and less than or equal to 15 percent of phosphorus lime. The passivation material takes the green and cheap biomass power plant ash as the main raw material, the biomass power plant ash is mixed with the lime and the phosphorus lime, any binding agent or a colloid auxiliary material is not added, and spherical grains are prepared; the granulation rate of the raw materials is more than 95 percent and the material returning rate is low. Negative influences of the auxiliary materials including the binding agent and the like can be avoided, and a raw material washing phenomenon is avoided; the application amount of the passivation material is less and only occupies 0.2 percent to 0.6 percent of the mass of soil of a plough layer; a heavy metal passivation effect is remarkable and stable, and the growth of plants is accelerated, so that the aim of efficiently and lastingly repairing the heavy metal cadmium and copper-polluted acidic soil in situ at a low cost is realized, and economic benefits, ecological benefits and a repairing effect are integrated.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a composite passivation material with biomass power plant ash as the main raw material for treating cadmium-copper-contaminated soil, and a preparation method and application thereof. Background technique [0002] In recent decades, with the rapid development of social economy, my country's farmland soil environment is facing unprecedented challenges, especially heavy metal cadmium pollution has become increasingly prominent, and heavy metal copper pollution in some areas has seriously exceeded the standard, causing crop failure. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", pointing out that the environmental quality of cultivated land soil is worrying, cadmium has become the primary pollutant (point exceeding the standard rate of 7.0%)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/06B09C1/08C09K101/00C09K109/00
CPCB09C1/08B09C2101/00C09K17/06C09K2101/00C09K2109/00
Inventor 周静崔键张娜陶志慧刘冰冰梁家妮
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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