Heavy metal chelating agent and preparation method thereof

A technology of heavy metal chelating agent and formula, applied in chemical instruments and methods, fertilizer mixture, agriculture, etc., can solve the problems of high operating cost, long time, high price, etc., achieve obvious ecological benefits, improve yield and quality, and be easy to apply Effect

Inactive Publication Date: 2013-08-14
HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The disadvantages of existing facility soil heavy metal pollution remediation technology are as follows: 1. Physical and chemical technology not only requires special equipment and technical personnel, but also is expensive, which can only suspend heavy metal pollution and cannot fundamentally solve the problem
But there are also some deficiencies, the most important is that it takes a relatively long time to remediate heavy metal-contaminated soil
3. Phytochemical joint restoration technology, the application of chemical chelating agents such as EDTA can increase the ability of plants to enrich heavy metals, but it may also cause underground leakage of toxic elements, resulting in potential pollution risks and high operating costs

Method used

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  • Heavy metal chelating agent and preparation method thereof
  • Heavy metal chelating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Raw materials: choose acid vine juice with a mass concentration of 57.1% (mixture of leaf juice and distilled water at 1:0.75), Inner Mongolia Wuchuan weathered coal (total humic acid content of 42.5%, ash content of 11.3%), and bentonite mine in Jiuying, Jilin Province - Calcium bentonite (montmorillonite content 78.5%, CEC 125 cmol / kg).

[0017] 2. Preparation:

[0018] (1) Take the leaves of the sour vine fruit, wash 3 times with tap water, 3 times with distilled water, air dry, and weigh the fresh weight. The leaves are picked and beaten with a mixer, a certain amount of distilled water is added during the beating process to make the ratio of fresh leaf weight to water weight 1:0.75, filtered with gauze after beating, and the juice is ready for use.

[0019] (2), the weathered coal is ground and passed through a 100-mesh sieve, and HNO with a mass concentration of 30% in a coal acid ratio of 1:0.5 is added 3 The solution was maintained at a temperature of 85° C...

Embodiment 2

[0024] 1. Raw materials: choose acid vine juice with a mass concentration of 50% (mixture of leaf juice and distilled water 1:1), Luobei weathered coal in Heilongjiang Province (total humic acid content 62.4%, ash content 10.6%), Shipailing, Changchun City, Jilin Province Bentonite ore-calcium bentonite (75.9% montmorillonite, 120cmol / kg cation exchange).

[0025] 2. Preparation:

[0026] (1) Take the leaves of the sour vine fruit, wash 3 times with tap water, 3 times with distilled water, air dry, and weigh the fresh weight. The leaves are picked and beaten with a mixer, a certain amount of distilled water is added during the beating process to make the ratio of fresh leaf weight to water weight 1:1, filtered with gauze after beating, and the juice is ready for use.

[0027] (2), the weathered coal is ground and passed through an 80-mesh sieve, and HNO with a mass concentration of 30% in a coal acid ratio of 1:0.5 is added 3 The solution was maintained at a temperature of 9...

Embodiment 3

[0032] 1. Raw materials: choose acid vine juice with a mass concentration of 46.5% (mixture of leaf juice and distilled water at 1:1.25), choose Luobei weathered coal in Heilongjiang Province (total humic acid content 62.4%, ash content 10.6%), Jiutai City, Jilin Province Bentonite ore-calcium bentonite (montmorillonite content 78.5%, CEC 125cmol / kg).

[0033] 2. Preparation:

[0034] (1) Take the leaves of the sour vine fruit, wash 3 times with tap water, 3 times with distilled water, air dry, and weigh the fresh weight. Pick the leaves, beat them with a mixer, add a certain amount of distilled water during the beating process to make the fresh leaf weight to water weight ratio 1:1.25, filter with gauze after beating, and use the juice for later use.

[0035] (2), the weathered coal is ground and passed through a 100-mesh sieve, and HNO with a mass concentration of 30% in a coal acid ratio of 1:0.5 is added 3 The solution is maintained at a temperature of 85-95° C. to carry...

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Abstract

The invention provides a heavy metal chelating agent and a preparation method thereof. The formula is as follows: the heavy metal chelating agent comprises Embelia laeta juice in mass concentration of 46.5-57.1%, bi-activated modified decomposed coal and acidic activated montmorillonite in the mass ratio of 1:0.2:0.15. The preparation method comprises the following steps of: grinding the bi-activated modified decomposed coal through a 100-mesh sieve; adding HNO3 liquor, wherein the ratio of coal to acid is 1:0.5 and the mass concentration of the HNO3 liquor is 30%; maintaining the temperature at 85-95 DEG C for oxidization and nitration reaction for 2.5 hours; and adding ammonia water in mass concentration of 30%, wherein the ratio of coal to ammonia water is 1:0.8, and HA of the decomposed coal is greater than or equal to 40%. The chelating agent can effectively chelate soil heavy metals to reduce stress to crops by heavy metals, so that the soil environment is improved, and the crop yield and quality are enhanced.

Description

technical field [0001] The invention relates to a rapid restoration technology for soil heavy metal pollution, in particular to a heavy metal chelating agent and a preparation method thereof. Background technique [0002] The shortcomings of the existing facility soil heavy metal pollution remediation technology are: 1. Physical and chemical technology not only requires specialized equipment and technical personnel, but also has high prices, which can only suspend heavy metal pollution and cannot fundamentally solve the problem. 2. Phytoremediation technology can be called "green" because of its low price, safety, easy operation, and in-situ implementation in polluted areas, which reduces the damage to the physical properties of the soil without causing secondary pollution to the surrounding environment. Repair Technology". However, there are also some shortcomings, the most important being that it takes a relatively long time to remediate heavy metal-contaminated soil. 3....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40A62D3/33A62D101/43
Inventor 张继舟王立民袁磊曹宏杰王宏韬马献发吕品罗春雨沈光于志民
Owner HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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