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Cadmium-arsenic compounded pollution repairing agent and preparation and application methods thereof

A technology of compound pollution and remediation agent, applied in the application, chemical instruments and methods, fertilizer mixture and other directions, can solve the problems of limiting the passivation effect of heavy metals, complicated process and high price, and achieve the reduction of the effectiveness of heavy metals, the reduction of soil bulk density, and the reduction of Effectiveness

Active Publication Date: 2018-12-25
湖南重金属污染耕地安全高效利用工程研究中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After investigation and research, it is found that: (1) increasing the soil pH can effectively reduce the activity of cadmium in the soil, but when the reaction is intense, the pH is too high, and the soil pH fluctuates greatly, the arsenic is dissolved and the effectiveness of arsenic is improved; (2) ) Humic acid is a macromolecular organic substance that exists widely in nature. The basic structure of humic acid macromolecules is an aromatic ring and an aliphatic ring. Adsorption and complexation of heavy metal ions, but humic acid is generally insoluble in water and soluble in alkaline solution, which limits its passivation effect on heavy metals; (3) Clay materials can be organically modified to load organic matter on the clay surface, making It can obtain better adsorption effect and adsorption selectivity of heavy metals, but the commonly used ones such as chitosan and cetyltrimethylammonium bromide (CTMAB) are relatively expensive, the process is complicated, and the application is less

Method used

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  • Cadmium-arsenic compounded pollution repairing agent and preparation and application methods thereof
  • Cadmium-arsenic compounded pollution repairing agent and preparation and application methods thereof
  • Cadmium-arsenic compounded pollution repairing agent and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 cadmium arsenic composite pollution remediation agent

[0049] 1) Add attapulgite to 1mol / L sulfuric acid at a mass ratio of 1:10, activate at 25°C for 30 minutes, filter after activation, save the acid solution for the first pass, and use the obtained filter residue as Washing with deionized water for several times until the obtained lotion and NaOH do not produce precipitation (that is, washing to no metal ions), drying and pulverizing to obtain acidified attapulgite;

[0050] 2) Add the acidified attapulgite to the NaOH solution with a concentration of 4% at a mass ratio of 1:10, modify it at 25°C for 30 minutes, filter after the modification, keep the filtered lye for later use, and filter the filter residue Dry and pulverize to obtain alkali metal ionized attapulgite;

[0051] 3) Add the alkali metal ionized attapulgite to the potassium humate solution with a concentration of 5% at a mass ratio of 1:20, modify it at 25°C for 60 minutes, and filter it ...

Embodiment 2

[0055] Embodiment 2 cadmium arsenic composite pollution remediation agent

[0056] 1) Add attapulgite to 1mol / L sulfuric acid at a mass ratio of 1:10, activate at 25°C for 30 minutes, filter after activation, save the acid solution for the first pass, and use the obtained filter residue as Washing with deionized water for several times, until the obtained lotion and NaOH do not produce precipitation (that is, washing to no metal ions), drying and pulverizing to obtain acidified attapulgite;

[0057] 2) Add the acidified attapulgite to the NaOH solution with a concentration of 4% at a mass ratio of 1:10, modify it at 25°C for 30 minutes, filter after the modification, keep the filtered lye for later use, and filter the filter residue to dry Dry crushing to obtain alkali metal ionized attapulgite.

[0058] 3) Add the alkali metal ionized attapulgite to the potassium humate solution with a concentration of 5% at a mass ratio of 1:20, modify it at 25°C for 60 minutes, and filter ...

Embodiment 3

[0062] Embodiment 3 cadmium arsenic composite pollution remediation agent

[0063] 1) Add attapulgite to 1mol / L sulfuric acid at a mass ratio of 1:10, activate at 25°C for 30 minutes, filter after activation, save the acid solution for the first pass, and use the obtained filter residue as Washing with deionized water for several times, until the obtained lotion and NaOH do not produce precipitation (that is, washing to no metal ions), drying and pulverizing to obtain acidified attapulgite;

[0064] 2) Add the acidified attapulgite to the NaOH solution with a concentration of 4% at a mass ratio of 1:10, modify it at 25°C for 30 minutes, filter after the modification, keep the filtered lye for later use, and filter the filter residue to dry Dry crushing to obtain alkali metal ionized attapulgite.

[0065] 3) Add the alkali metal ionized attapulgite to the potassium humate solution with a concentration of 5% at a mass ratio of 1:20, modify it at 25°C for 60 minutes, and filter ...

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Abstract

The invention provides a cadmium-arsenic compounded pollution repairing agent. The cadmium-arsenic compounded pollution repairing agent is composed of calcium carbonate, silicon-calcium-magnesium fertilizer, humic acid-modified clay and Fe(OH)3 which are mixed at a weight ratio of 10-30:30-60:10-40:1-10, wherein the humic acid-modified clay is prepared through clay acidification, acidified clay alkali metal ionization and humic acid modification. The invention further provides a preparation method of the cadmium-arsenic compounded pollution repairing agent. The preparation method of the cadmium-arsenic compounded pollution repairing agent comprises (1) clay acidification, (2) acidified clay alkali metal ionization, (3) clay humic acid modification and (4) preparation of the cadmium-arseniccompounded pollution repairing agent. The cadmium-arsenic compounded pollution repairing agent can effectively reduce activity of cadmium, influence dissolution of arsenic, achieve passivated heavy metal absorbing effects, increase the content of soil organic matters, improve the soil structure and promote plant growth.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and in particular relates to a cadmium-arsenic composite pollution restoration agent and a preparation method and application thereof. Background technique [0002] Soil acidification is a manifestation of soil degradation. Soil acidification is not only an important reason for the decline of soil fertility, but also an important factor restricting the sustainable development of agricultural production. According to statistics, from the 1980s to the present, my country's soil acidification has become more and more serious, and the acidified land area has expanded to more than 40% of my country's cultivated land area, and often occurs in large areas, especially in southern my country. The soil itself is slightly acidic, and there is more rainfall, which makes the soil acidification more serious. Soil acidification can cause the activation of heavy meta...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 谭石勇文亚雄谭武贵郭帅刘备李雪玲张冬雪
Owner 湖南重金属污染耕地安全高效利用工程研究中心有限公司
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