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

A zero-valent iron, modified technology, applied in the restoration of polluted soil and other directions, can solve the problems of high cost and poor restoration effect, and achieve the effect of removing pesticide residues, excellent stability and good dispersibility.

Active Publication Date: 2016-12-07
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 method of modified micron zero-valent iron and application method of modified micron zero-valent iron in remediation of heavy metal contaminated soil

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 an application method of the modified micron zero-valent iron in remediation of heavy metal contaminated soil. The preparation method of the modified micron zero-valent iron comprises the steps of cleaning of iron raw materials, preparation of micro iron, ultrafine grinding and modifying treatment. A modifying agent composed of water, xanthan gum, sulfide, a stabilizing agent, zeolite and blast furnace slag is adopted in the step of modifying treatment. The preparation method of the modified micron zero-valent iron has the beneficial effects that the production process of the modified micron zero-valent iron is simple, and the effect similar or superior to micron zero-valent iron is achieved while the cost is reduced; and in addition, the reaction activity is controlled, the oxidation rate is decreased, excellent stability is obtained, and the acting time of the micron zero-valent iron is longer. By the adoption of the application method of the modified micron zero-valent iron, the remediation cost of heavy metal contaminated underground water is further reduced. According to the preparation method of the modified micron zero-valent iron and the application method of the modified micron zero-valent iron in remediation of heavy metal contaminated soil, organic fertilizer is added in the soil treatment process so that the fertility of soil can be improved, the structure of soil can be improved through humic acid produced by the organic fertilizer, heavy metal elements, such as lead, chromium and arsenic, in underground water can be removed, and the concentration of pollutants such as nitrate and perchlorate can be reduced.

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 Applications(China)
IPC IPC(8): B22F9/04B22F1/00B09C1/08
Inventor 丁贞玉
Owner CHINESE ACADEMY FOR ENVIRONMENTAL PLANNING
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