Preparation of a modified micron zero-valent iron and its application method in remediation of soil heavy metal pollution

A zero-valent iron and modification technology, applied in the restoration of polluted soil, etc., can solve the problems of high cost and poor repair effect, and achieve the effect of removing pesticide residues, good market promotion value, and reducing oxidation rate

Active Publication Date: 2017-11-03
CHINESE ACADEMY FOR ENVIRONMENTAL PLANNING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the cost of remediation of heavy metals in soil using existing nano-iron-related technologies is high, and the remediation effect is not good

Method used

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  • Preparation of a modified micron zero-valent iron and its application method in remediation of soil heavy metal pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a technical solution: a preparation method of modified micron zero-valent iron, comprising the following steps:

[0028] S1: Clean iron raw materials, use scrap iron as raw material, soak the raw material in clean water for 3 minutes, then add lye to the clean water and continue soaking for 5 minutes, then use clean water to wash away surface stains and oil stains, and then use scrap iron raw materials Place it in dilute hydrochloric acid liquid with a mass concentration of 5%, soak it and heat it, the heating temperature is 80 degrees Celsius, the reaction time is 10 minutes, and finally the scrap iron raw material is taken out and dried;

[0029] S2: Prepare micron iron, use high-energy ball mill, beat and pulverize the iron raw material after cleaning in the previous step for 50 minutes, then pass through a 200-mesh sieve for screening, and store the iron powder that passes the screening for future use, and continue if the particle diameter does...

Embodiment 2

[0038] The invention provides a technical solution: a preparation method of modified micron zero-valent iron, comprising the following steps:

[0039]S1: Clean iron raw materials, use scrap iron as raw material, soak the raw material in clean water for 4 minutes, then add lye to clean water and continue soaking for 6 minutes, then use clean water to wash away surface stains and oil stains, and then use scrap iron raw materials Place it in dilute hydrochloric acid liquid with a mass concentration of 5%, soak it and heat it, the heating temperature is 88 degrees Celsius, the reaction time is 13 minutes, and finally the scrap iron raw material is taken out and dried;

[0040] S2: Prepare micron iron, use high-energy ball mill, beat and pulverize the iron raw material after cleaning in the previous step for 56 minutes, then pass through a 200-mesh sieve for screening, and store the iron powder that passes the screening for future use, and continue if the particle diameter does not ...

Embodiment 3

[0049] The invention provides a technical solution: a preparation method of modified micron zero-valent iron, comprising the following steps:

[0050] S1: Clean the iron raw materials, use scrap iron as the raw material, soak the raw materials in clean water for 5 minutes, then add lye to the clean water and continue soaking for 8 minutes, then use clean water to wash away the surface stains and oil stains, and then use the scrap iron raw materials Place it in dilute hydrochloric acid liquid with a mass concentration of 5%, soak it and heat it, the heating temperature is 90 degrees Celsius, the reaction time is 15 minutes, and finally the scrap iron raw material is taken out and dried;

[0051] S2: Prepare micron iron, use high-energy ball mill, beat and pulverize the iron raw material after cleaning in the previous step for 60 minutes, then pass through a 200-mesh sieve for screening, and store the iron powder that passes the screening for future use, and continue if the parti...

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Abstract

The invention discloses a preparation method of modified micron zero-valent iron and its application method in the restoration of soil heavy metal pollution, including cleaning iron raw materials, preparing micron iron, ultrafine grinding, and modification treatment steps. Using water, xanthan gum, sulfide, stabilizer, zeolite, and a modifier composed of blast furnace slag, the beneficial effects of the present invention are: the production process of the micron zero-valent iron of the present invention is simple, and while reducing the cost, obtained The effect is similar to or better than that of nanometer zero-valent iron, and the reactivity is controlled, the oxidation rate is reduced, excellent stability is obtained, and the action time of micron zero-valent iron is longer. The method further reduces the cost of groundwater heavy metal restoration. The invention can improve the fertility of the soil by adding organic fertilizer in the soil treatment process, and the humic acid produced by the organic fertilizer can improve the structure of the soil, and can not only remove lead and chromium in the groundwater and arsenic and other heavy metal elements, and can also reduce the concentration of pollutants such as nitrate and perchlorate.

Description

technical field [0001] The invention relates to the field of soil heavy metal treatment, in particular to the preparation of modified micron zero-valent iron and its application method in soil heavy metal pollution restoration. Background technique [0002] With the development of industry, the pollution is becoming more and more serious. Among them, soil pollution is closely related to people's life. The heavy metal content in the soil affects the quality of the food. The heavy metal chromium is one of the main metal elements of soil heavy metal pollution. Although arsenic is not a metal element, it plays a significant role in soil pollution. Therefore, arsenic is usually included in the scope of treatment when soil heavy metals are treated. [0003] Zero-valent iron has a strong reduction ability, and can replace the metals that are ranked next in the metal activity sequence table and deposit them on the surface of iron to achieve the purpose of decontamination. Due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00B09C1/08
Inventor 丁贞玉
Owner CHINESE ACADEMY FOR ENVIRONMENTAL PLANNING
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