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Conditioner for repairing medium-light acidic cadmium-contaminated soil, preparation method and application

A technology of cadmium-contaminated soil and soil conditioner, which is applied in the field of soil pollution control, can solve problems such as differences in passivators, and achieve the effects of reducing mobility, saving resources, and realizing recycling and reuse

Inactive Publication Date: 2017-05-03
HUNAN SOIL & FERTILIZER INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clay minerals, biochar, and organic materials are commonly used passivators for in-situ passivation restoration technology. However, in the actual application process, the effects of passivators applied to soils with different cadmium pollution characteristics are quite different.

Method used

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  • Conditioner for repairing medium-light acidic cadmium-contaminated soil, preparation method and application
  • Conditioner for repairing medium-light acidic cadmium-contaminated soil, preparation method and application
  • Conditioner for repairing medium-light acidic cadmium-contaminated soil, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A conditioner (T1) for remediating mildly acidic cadmium-contaminated soil, which is formulated by weight from the following raw materials:

[0073]

[0074]

[0075] A preparation method of a conditioner for remediating mildly acidic cadmium-contaminated soil, the steps of which are:

[0076] A. After crushing 120 kg of sepiolite, 30 kg of biochar, and 150 kg of quicklime through a 70 or 80 or 90 or 100 mesh sieve, mix them evenly with a vertical mixer, and the total weight does not exceed 300 kg;

[0077] B. Add 60 kg of water to make the raw materials generate heat. Stir while adding water. The stirring time is 1 minute or 1.5 minutes or 2 minutes to mix the water and the mixture. The mixture gradually heats up from room temperature to 75 or 77 or At 79 or 80°C, stop stirring;

[0078] C. Gradually raise the temperature of the mixture in step B to 98 or 99 or 100°C. At this time, part of the water added to the material will vaporize, and the mixture will "boil...

Embodiment 14

[0086] The application of a soil conditioner in the improvement of mild cadmium pollution in soil has the following effects:

[0087] Field test: The soil conditioner prepared above (the formula is red mud: quicklime: sepiolite: biochar is 40:30:25:5) is applied to the paddy field with moderate and mild acidic cadmium pollution (the total cadmium content of the soil is 0.3~ 0.9mg / kg, soil pH value is less than 6.5), to verify the present invention's impact on soil cadmium bioavailability. The test site was carried out in Beishan Town, Changsha County. The test soil was paddy soil with granite development. Its basic physical and chemical properties are shown in Table 2:

[0088] Table 2 Basic physical and chemical properties of the tested soil

[0089]

[0090] The test adopts the plot test method, with 4 treatments in total, 3 repetitions, and the plot area is 30m 2, random block arrangement, peripheral protection row. The plots are separated by soil ridges covered with ...

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Abstract

Provided are a conditioner for repairing medium-light acidic cadmium-contaminated soil, a preparation method and application. The conditioner is prepared from red mud, quick lime, sepiolite and charcoal in a certain proportion. The preparation method comprises the steps that A, the sepiolite, the charcoal and the quick lime are smashed and mixed to be uniform, and a mixture A is obtained; B, water is added into the mixture, stirring is carried out while water adding, the water and the mixture A are mixed to be uniform to generate heat, and when the mixture A is boiled, stirring is stopped; C, after the mixture A is cooled, the smashed red mud is added into a vertical stirrer, and the materials are stirred to be uniform; D, detection is carried out, and the conditioner is obtained. According to the application of the conditioner to improvement of the medium-light acidic cadmium-contaminated soil, the conditioner is reasonable in formula, convenient to use, wide in source and low in cost, and the activated silica content in the product is increased; and meanwhile, all components are fully mixed to be uniform, and the uniformity of the product and the stability of the repairing effect are greatly improved.

Description

technical field [0001] The invention belongs to the field of soil pollution control, and in particular relates to a conditioner for repairing mildly acidic cadmium-contaminated soil, and also relates to a preparation method for a conditioner for repairing medium-slightly acidic cadmium-contaminated soil, and also relates to a repairing agent Use of a conditioner for mildly acidic cadmium-contaminated soil. Background technique [0002] At present, the cultivated land soil in southern my country generally has environmental problems such as acidification and excessive heavy metals in the soil, especially the situation of excessive cadmium in farmland soil is more serious. [0003] Affected by various factors such as the southern climate, acid rain, and the use of chemical fertilizers, acidification of farmland soil is inevitable. Affected by the hot and humid climate conditions in the south, soil silicate minerals and secondary minerals are weathered quickly, and cations such...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/02C09K101/00
CPCB09C1/08B09C2101/00C09K17/02C09K2101/00
Inventor 谢运河纪雄辉田发祥吴家梅柳赛花彭华
Owner HUNAN SOIL & FERTILIZER INST