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Composite preparation for fixing lead in soil and preparation method and application thereof

A preparation and soil technology, applied in the field of soil pollution control, can solve problems such as ignoring the improvement of soil fertility, and achieve the effect of increasing agricultural value, improving agricultural value, and low cost

Inactive Publication Date: 2012-07-11
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At the same time, 1) by adding hydroxyapatite to remediate lead-contaminated land, the starting point is to simply fix the soluble lead in the passivated soil, while ignoring the improvement of soil fertility

Method used

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  • Composite preparation for fixing lead in soil and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12、 comparative example 1～8

[0027] Selection of soil S in a lead-zinc mining area in Hunan 1 As the test object, the experiment calculated the amount of HA addition according to the P / Pb molar ratio, and set a blank sample and 4 levels of phosphorus dosage, and the HA / Pb molar ratio was: 0, 1, 2, 4 and 8; at the same time, The experiment calculated KCl addition amount according to the Cl / Pb molar ratio, and set 1 blank sample and 3 KCl dosage levels, that is, KCl / Pb molar ratio 0, 0.5, 1 and 2, a total of 20 treated samples. The fixed effect analysis adopts the method of TCLP leaching test, and the determination of Pb uses plasma mass spectrometry (Inductively coupled plasmamass spectrometry, ICP-MS for short).

[0028] The mining soil S used in the test 1 The samples were air-dried naturally and passed through a 100-mesh sieve; the particle sizes of HA and KCl were both <60 mesh.

[0029] Table 1 Test soil S 1 And the background content of Pb in the additive used / mg kg -1

[0030] -

...

Embodiment 13～18、 comparative example 9

[0049] The test soil is the soil S of a lead-zinc mining area in southern Hunan. 2 , the total Pb content is 2573mg·kg -1 . Because the Pb content of the tested soil was different from that of S 1 , The amount of HA and KCl to be weighed during sample preparation is different from that of Examples 1-12, and other experimental procedures are the same as those of Examples 1-12. The results are shown in Table 3.

[0050]Table 3 The combined preparation of the present invention deals with the lead-fixing effect of mining area soil S2

[0051]

[0052] From the table above, comparing Examples 13-18 with Comparative Example 9, it can be seen that the combined preparation of the present invention has a remarkable lead-fixing effect. When HA: Cl: Pb=(4~8):(0.5~2): in the scope of 1, the lead fixing rate of the combination preparation of the present invention is all above 87.7%, and the lead fixing rate reaches 97.4% when optimum.

Embodiment 19～20、 comparative example 10

[0054] The test soil is the soil S of a lead-zinc mining area in western Hunan. 3 , with a total Pb content of 939mg kg -1 . Because the Pb content of the tested soil was different from that of S 1 , The amount of HA and KCl to be weighed during sample preparation is different from that of Examples 1-12, and other experimental procedures are the same as those of Examples 1-12. The results are shown in Table 4.

[0055] Table 4 Combination preparation of the present invention treats mining area soil S 3 lead-fixing effect

[0056] make up

[0057] Through the above table, comparing Examples 19 to 20 with Comparative Example 10, it can be seen that the combination preparation of the present invention has a remarkable effect. When HA:Cl:Pb=(4~8):1:1 in the scope of The immobilization rate of lead in soil was 86.2%, and the immobilization rate of Pb reached 98.0% at the optimal ratio.

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Abstract

The invention relates to a composite preparation for fixing lead in soil and a preparation method and an application thereof. The composite preparation provided by the invention is composed of 10-80 parts by mol fraction of hydroxyapatite and 5-20 parts by mol fraction of potassium chloride, preferably 40-80 parts by mol fraction of hydroxyapatite and 10-15 parts by mol fraction of potassium chloride, most preferably 75-80 parts by mol fraction of hydroxyapatite and 10-15 parts by mol fraction of potassium chloride. The hydroxyapatite and potassium chloride are smashed and are mixed in proportion, thus the composite preparation in the invention is obtained. When the composite preparation provided by the invention is used for repairing lead polluted soil, the composite preparation is uniformly mixed with the soil to be repaired according to the mol mass ratio of the composite preparation to Pb in the lead polluted soil, namely HA: KCl: Pb= (10-80): (5-20): 10. By applying the compositepreparation provided by the invention, the lead polluted soil can be effectively repaired, the fertility of the soil can be improved, and the agricultural value of the repaired soil can be improved.

Description

technical field [0001] The invention relates to the field of soil pollution control in environmental protection, in particular to a combined preparation for fixing lead in soil, a preparation method and application thereof. Background technique [0002] Mining activities and the discharge of waste not only destroy and occupy a large amount of land resources, but also exacerbate the contradiction between the large population and the small land in our country, and the discharge and storage of mine waste have also brought a series of far-reaching environmental problems and health hazards . According to statistics, the cumulative amount of solid waste discharged into the environment by the non-ferrous metal industry in China has reached 1.0×10 9 t, cultivated land polluted by heavy metals is about 2.0×10 7 hm 2 (Chen Huaiman, Zheng Chunrong, Zhou Dongmei. Some issues worthy of attention in the study of my country's soil environmental protection. Journal of Agricultural and En...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 李永华杨林生虞江萍李海蓉王五一王利姬艳芳
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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