Regulation and control agent in use for treating soil polluted by heavy metals

A technology of polluted soil and regulating agent, applied in the direction of application, fertilizer mixture, fertilization device, etc., can solve the problems of ineffective treatment of compound pollution, lack of research on regulating agent system, and difficulty in direct application of technology, so as to realize waste recycling, Reduce the risk of migration and improve the repair effect

Inactive Publication Date: 2007-07-25
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bone char disclosed in the related patent (a method for utilizing bone char to control lead-contaminated soil, application number 200510006261.5, publication number CN1810398A) utilizes the fixing effect of hydroxyapatite in the bone, but it only has a good effect on soil lead. fixed effect
[0006] At present, there are still some problems in the immobilization and restoration of metal-contaminated soil. For example, due to the complexity of the research objects and th

Method used

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  • Regulation and control agent in use for treating soil polluted by heavy metals
  • Regulation and control agent in use for treating soil polluted by heavy metals

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Wash the animal bones, cook them in boiling water for 2 hours, remove the residual tissues, dry them in an oven at 80°C, take them out and crush them, then calcinate them at 900°C for 2 hours, and then crush them into 200-mesh powder with a ball mill. Mix it with silicon-calcium-magnesium fertilizer ("Feida Lingsu" brand, produced by Henan Anyang Feida Silicon and Potassium Fertilizer Co., Ltd.) at a weight ratio of 1:1 to make a basic regulator for future use. Add a mixed solution of Fe, Zn, Mn, Mo, and B elements to the basic regulator with a mass ratio of 1:1, and the amount of the elements is respectively Fe 2 o 3 0.1%, ZnO O.3%, MnO 0.1% to control, FeSO 4 ·H 2 O, ZnSO 4 ·7H 2 O, MnSO 4 ·7H 2 O compound preparation, the element concentration in the solution is Fe 2+ 704ppm, Zn 2+ 2419ppm, Mn 2+ 778ppm. After stirring evenly, dry it at 60°C to make the regulator, and its pH value is 9.3 (solid-liquid ratio is 1:2.5). After X-ray fluorescence spectroscopi...

Embodiment 2

[0038] Wash the animal bones, cook them in boiling water for 2 hours, remove the residual tissues, dry them in an oven at 80°C, take them out and crush them, then calcinate them at a high temperature above 900°C for 2 hours, and then crush them into 200-mesh powder with a ball mill , mixed with silicon-calcium-magnesium fertilizer ("Feida Lingsu" brand, produced by Henan Anyang Feida Silicon and Potassium Fertilizer Co., Ltd.) at a weight ratio of 2:1 to make a basic regulator for later use. Add a mixed solution of Fe, Zn, Mn, Mo, and B elements to the basic regulator with a mass ratio of 1:1, and the amount of the elements is respectively Fe 2 o 3 1.0%, ZnO 0.5%, MnO 0.5%, MoO 3 0.1%, B 2 o 3 0.1% to control FeSO 4 ·H 2 O, ZnSO 4 ·7H 2 O, [(NH 4 ) 6 Mo 7 o 24 4H 2 O], MnSO 4 ·7H 2 O, Na 2 B 4 o 7 10H 2 Compounds such as O are prepared, and the concentration of trace elements in the solution is Fe 2+ 7157ppm, Zn 2+ 4100ppm, Mn 2+ 3960ppm, Mo 7 o 24 6-...

Embodiment 3

[0040] Wash the animal bones, cook them in boiling water for 2 hours, remove the residual tissues, dry them in an oven at 80°C, take them out and crush them, then calcinate them at a high temperature above 900°C for 2 hours, and then crush them into 200-mesh powder with a ball mill , mixed with silicon-calcium-magnesium fertilizer ("Feida Lingsu" brand, produced by Henan Anyang Feida Silicon and Potassium Fertilizer Co., Ltd.) at a weight ratio of 1.5:1 to make a basic regulator for later use. Add a mixed solution of Fe, Zn, Mn, Mo, and B elements to the basic regulator with a mass ratio of 1:1, and the amount of the elements is respectively Fe 2 o 3 0.5%, ZnO 0.4%, MnO 0.2%, MoO 3 0.05%, B 2 o 3 0.05% to control FeSO 4 ·H 2 O. ZnSO 4 ·7H 2 O, [(NH 4 ) 6 Mo 7 o 24 4H 2 O], MnSO 4 ·7H 2O, Na 2 B 4 o 7 10H 2 Compounds such as O are prepared, and the concentration of trace elements in the solution is Fe 2+ 3543ppm, Zn 2+ 3249ppm, Mn 2+ 1568ppm, Mo 7 o 24 ...

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Abstract

This invention discloses preparation and application of regulator for repairing soil polluted by heavy metals. The regulator utilizes hydroxyapatite extracted from animal bone as the main raw material, as well as commercialized Si-Ca-Mg Fertilizer at a ratio of 1:(0.5-1). Besides, solutions containing Fe, Zn, Mn, Mo, B, etc., are also added. The regulator comprises: CaO 40-50 wt.%, SiO2 10-20 wt.%, MgO 3-6 wt.%, P2O5 15-30% wt.%, Al2O3 5-10 wt.%, K2O 0.1-0.5 wt.%, Fe2O3 0.1-1.0% wt.%, ZnO 0.3-0.5 wt.%, MnO 0.1-0.5 wt.%, and impurities. Once applied, the regulator is uniformly mixed with soil according to a ratio of 0.05-1.0 wt. % of dry soil. The regulator has such advantages as abundant raw materials, simple process, low cost, good repairing effect, low addition amount, no secondary pollution, no influence on soil structure, and high nutrition, thus can partly replace chemical fertilizers.

Description

technical field [0001] The invention relates to a soil conditioner used in the technical field of soil remediation and its preparation and use method, more specifically to a conditioner used for treating heavy metal polluted soil and its preparation and use method. Background technique [0002] With the rapid development of modern industry and agriculture, a large number of pollutants enter the soil ecosystem through various channels, which makes soil pollution more and more serious. At present, my country's heavy metal-contaminated soil exceeds 300 million mu, accounting for about 1 / 6 of the total cultivated land. The accumulation of harmful heavy metals in the soil to a certain extent will cause toxicity to the soil-plant system, which not only leads to the degradation of land quality, affects the safety of agricultural products, and poses a serious threat to human and animal health through the food chain, but also through runoff and leaching Pollution of surface water an...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G1/00C05G3/80
Inventor 王晓蓉林仁漳郭红岩吕晓迎周辉周徐海耿健
Owner NANJING UNIV
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