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Iron/manganese oxide for passivating soil heavy metals and preparation method thereof

A technology of iron-manganese oxides and heavy metals, which is applied in the direction of chemical instruments and methods, soil conditioning materials, fertilizer mixtures, etc., can solve the problems of insufficient complete removal, and achieve the effect of enhancing environmental protection and restoration functions

Active Publication Date: 2011-08-31
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition to clay minerals, the main mineral composition of the soil also contains a certain amount of natural minerals such as iron-manganese oxides, which have strong absorption capacity for harmful heavy metal elements such as cadmium, lead, copper, zinc, chromium, and nickel, and have natural The function of reducing the toxicity of (light) soil harmful heavy metal elements, but the content of iron and manganese oxides in the soil is not enough to completely remove the toxicity of soil harmful heavy metal elements

Method used

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  • Iron/manganese oxide for passivating soil heavy metals and preparation method thereof
  • Iron/manganese oxide for passivating soil heavy metals and preparation method thereof
  • Iron/manganese oxide for passivating soil heavy metals and preparation method thereof

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Effect test

Embodiment 1

[0034] An iron-manganese oxide for passivating soil heavy metals, which is made of the mass fraction of the following two raw materials:

[0035] Raw material mass fraction%

[0036] Clean Red Mud 76

[0037] Ferromanganese ore powder 24.

[0038] A kind of preparation method of the iron-manganese oxide of passive soil heavy metal, its step is:

[0039] A. Select clean red mud, pass through a 100 mesh, or 110 mesh, or 120 mesh, or 140 mesh sieve through ball milling, and set aside. The said clean red mud contains Fe 2 o 3 +MnO 2 The sum is 25-35%, the content of heavy metal cadmium and lead (calculated as Cd and Pb respectively) ≤ 0.2mg / kg, the moisture content (calculated as H 2 O meter) ≤ 2.5%.

[0040] B. Select high-iron manganese ore raw ore, pass through 100 mesh, or 110 mesh, or 120 mesh, or 140 mesh sieve through ball milling, and set aside. The high-iron manganese ore raw ore contains 18-25% manganese content (calculated as Mn), 30-40% iron content (calculated...

Embodiment 2- example 17

[0044] An iron-manganese oxide for passivating heavy metals in soil, which is made of the mass fraction of the following raw materials:

[0045]

[0046] Its preparation steps are identical with embodiment 1.

[0047] After the product is made, the content of its iron manganese oxide (as Fe 2 o 3 +MnO 2 The sum) range is shown in the table below:

[0048]

[0049] The finished product can be widely used in the production of rice, corn, vegetables and other agricultural products in the heavy metal polluted areas, especially the mild cadmium and lead polluted areas.

[0050] The pilot test and demonstration promotion of a ferromanganese oxide that passivates heavy metals in soil are as follows:

[0051] During the period from 2008 to 2010, in Zhuzhou Majia River heavy metal pollution area (soil is cadmium-nickel compound pollution type), Anhua 715 mining area (soil is cadmium pollution type), Jiahe Taojia River heavy metal pollution area (soil is lead-cadmium compound ...

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Abstract

The invention discloses an iron / manganese oxide for passivating soil heavy metals and a preparation method thereof. The iron / manganese oxide for passivating soil heavy metals is proportionally prepared from clean red mud and high-iron / manganese mineral powder. The method comprises the following steps: A. preparing clean red mud; B. preparing high-iron / manganese mineral powder; and C. evenly mixing the raw materials prepared in the steps A and B to obtain the iron / manganese oxide. The formula is reasonable; and the method is easy to implement and simple to operate. The invention is mainly characterized in that the total content of Fe2O3+MnO2 is 34.7-60.8%, the contents of activated-state cadmium and lead in soil of heavy-metal-polluted farmland are respectively reduced by 27.4-58.9% and 14.6-52.1%, and the contents of cadmium and lead in rice, corn, vegetables and other agricultural products are respectively reduced by 20.5-57.3% and 25.9-58.2%. The invention is applicable to production of rice, corn, vegetables and other primary agricultural products in broad heavy-metal-polluted regions, especially lightly cadmium / lead-polluted regions.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to an iron-manganese oxide that can effectively passivate heavy metals in soil, and also relates to a preparation method of iron-manganese oxide that can passivate heavy metals in soil, which is applicable to The production of bulk agricultural products such as rice, corn, and vegetables in heavy metal-polluted areas, especially in lightly cadmium-lead-polluted areas. Background technique [0002] With the continuous advancement of industrialization and urbanization, the problem of heavy metal pollution in my country's soil has been paid more and more attention by people. According to relevant reports, in the early 1980s, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercury, arsenic, chromium, and nickel in my country was only 2.67 million hm 2 , increased to 6.67 million hm in 1988 2 , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/04C09K101/00
Inventor 黄道友朱奇宏刘守龙罗尊长朱昌宇饶中秀曹晓玲雷敏周斌
Owner INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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