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Passivator for controlling pollutions of heavy metals copper, lead and cadmium on soil and applications thereof

A heavy metal and passivating agent technology, applied in the restoration, application, soil conditioning materials and other directions of polluted soil, can solve the problems of hyperaccumulation of plant biomass limitation, unsuitable for large-scale operation, cumbersome preparation process, etc., to achieve environmental friendliness , the effect of short cycle and simple process

Inactive Publication Date: 2012-07-11
HUAZHONG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent application (200410027833.3) discloses a method of planting small flying grass and inoculating heavy metal-activated bacteria on this basis to repair heavy metal-contaminated soil, but the soil structure, pH value, salinity, pollutant concentration and other toxicity Substances may limit the biomass of hyperaccumulator plants, making it difficult to spread
Chinese invention patent application (Application No. 200410082977.9) discloses that a heavy metal fixative is prepared by using diammonium hydrogen phosphate and straw ash after a series of treatments, and then it is used to fix heavy metals cadmium, lead, copper and zinc. Although the repair efficiency is high, The raw materials are simple and easy to obtain, but the preparation process is relatively cumbersome
Chinese invention patent application (application number 200810198394.0) has announced a chemical leaching repair method for heavy metal cadmium, copper, lead, zinc and arsenic, mercury contaminated soil, using Na 2 EDTA, oxalic acid and KI combined step-by-step leaching method to achieve chemical remediation of cadmium, copper, lead, zinc, arsenic and mercury in polluted soil, so that heavy metals in polluted soil can meet environmental safety standards, but leaching The method of washing and leaching is better for small areas heavily polluted by heavy metals, but it is not suitable for large-scale operations.

Method used

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  • Passivator for controlling pollutions of heavy metals copper, lead and cadmium on soil and applications thereof
  • Passivator for controlling pollutions of heavy metals copper, lead and cadmium on soil and applications thereof
  • Passivator for controlling pollutions of heavy metals copper, lead and cadmium on soil and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The preparation of embodiment 1 passivating agent

[0012] The three phosphate rock powders tested were produced in Baokang, Nanzhang and Zhongxiang, Hubei respectively, and their P 2 o 5 The content is 26.1%, 24.2% and 23.2% in turn. Weigh about 0.25g of phosphate rock powder passed through a 100-mesh sieve (particle size: 0.15mm) into a 50mL centrifuge tube, add 5mL of -1 The oxalic acid is cultivated and activated in a thermostat at 40±0.5°C for 6 days, and dried at 50°C to obtain activated phosphate rock powder. The following are the three phosphate rock powders activated by oxalic acid P 2 o 5 % detection data (Table 1).

[0013] Table 1 The available phosphorus content (P 2 o 5 %)

[0014]

Embodiment 2

[0015] The preparation of embodiment 2 passivating agent

[0016] Weigh 5, 2.5, 1, 0.5, and 0.25 g of phosphate rock powder passed through a 100-mesh sieve into a 50 mL centrifuge tube, and add 5 mL of it to a concentration of 0.5 mol L -1 The oxalic acid is cultivated and activated in a thermostat at (40±0.5)°C for 6 days, and dried at 50°C to obtain activated phosphate rock powder. The following are the three kinds of phosphate rock powder activated by oxalic acid, P 2 o 5 % detection data (see Table 2).

[0017] Table 2 The available phosphorus content (P 2 o 5 %)

[0018]

Embodiment 3

[0019] The preparation of embodiment 3 passivating agent

[0020] Weigh 0.25g of phosphate rock powder with different particle sizes into a 50mL centrifuge tube, add 5mL of -1 The oxalic acid is cultivated and activated in an incubator at 40±0.5°C for 6 days, and dried at 50°C to obtain activated phosphate rock powder. The following are three kinds of phosphate rock powder activated by oxalic acid, P 2 o 5 % detection data (Table 3).

[0021] Table 3 The available phosphorus content (P 2 o 5 %)

[0022]

[0023] Embodiment 4 application embodiment

[0024] According to the results of Examples 1, 2, and 3, the optimum method for determining the preparation of passivator is as follows: mix the phosphate rock of 100 mesh sieves with 0.5mol L -1 The oxalic acid is mixed at a solid-to-liquid ratio of 1:10, activated at 28°C for 6 days, and dried at 50°C for 20-24h. The passivators used in the following application examples are all prepared by this method. P 2 o 5 The ...

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Abstract

The invention belongs to the technical field of soil heavy metal pollution control and particularly relates to a passivator which is suitable for the in-situ control of the pollutions of heavy metals copper, lead and cadmium on soil and applications thereof. The passivator uses middle-grade and low-grade phosphate ore powder as the main raw material and the heavy metal passivator is prepared to passivate heavy metals in soil. The preparation method of the passivator comprises the following steps: smashing the middle-grade and low-grade phosphate ore of which P2O5 content is 20-30%, sieving with a 100 meshes of screen to obtain phosphate ore powder, mixing the phosphate ore powder with 0.1-0.7mol / L of oxalic acid according to the solid-to-liquid ratio of 1:1-1:20, activating at 28 DEG C for 6 days, and then drying at 50 DEG C for 20-24h to obtain the passivator. 3.97g of the prepared passivator is applied in 1kg of soil which is polluted by heavy metals; and the lettuce which grows for 120 days is harvested, and sampling is performed to measure the content of various forms of heavy metals in soil and the plant absorption amount. The passivator fully utilizes the middle-grade and low-grade phosphate ore resource which is difficult in use in China; and the passivator has the characteristics that the investment is low, the engineering quantity is low, the physicochemical properties of soil can not be damaged and secondary pollution can not be caused.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, in particular to a passivator for controlling soil heavy metal copper, lead and cadmium pollution and its application. The invention uses medium and low-grade phosphate rock powder as the main raw material to prepare a heavy metal passivator to passivate soil heavy metals. Background technique [0002] Heavy metal pollution is one of the main types of soil pollution. Worldwide, due to the discharge of industrial and mining wastes and the excessive use of agricultural chemicals, toxic heavy metals in the soil around industrial and mining areas and agricultural soil have accumulated excessively, which has brought serious environmental and health risks (Xiao Pengfei et al., 2004). Therefore, the decontamination technology of heavy metals in soil has attracted much attention. The treatment of heavy metal pollution in soil mainly includes physical, biological and chemical ...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 姜冠杰胡红青刘永红许学慧付庆灵张峻清黄丽
Owner HUAZHONG AGRI UNIV
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