Iron-manganese oxide based heavy metal curing agent and preparation method and applications thereof

A technology of iron-manganese oxides and heavy metals, applied in chemical instruments and methods, applications, fertilizer mixtures, etc., can solve the problem of the inability to fix multiple heavy metal ions at the same time, the lack of research on the long-term stability of solidified bodies, and the lack of large-scale engineering practice Application and other issues, to achieve the effect of beneficial soil virtuous cycle, strong solidification and stabilization ability of heavy metals, and improvement of soil continuous cropping obstacles

Inactive Publication Date: 2019-09-20
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, the main mechanism of solidification / stabilization technology is to change the existing form of heavy metals in the soil, so that plants cannot effectively absorb heavy metal elements in the soil, so the conversion efficiency of solidification and stabilization agents is the decisive factor for their quality; secondly, the currently used There are still relatively few types of curing / stabilizing agents, the repair effect needs to be improved, and the research on the long-term stability of the cured body is still relatively lacking; in addition, the existing curing / stabilizing agents are all for the curing of a single heavy metal ion, and cannot fix multiple heavy metals at the same time ions, and the production process of the curing agent is complicated, the cost is high, and the curing and stabilization effect is not good; again, because the curing / stabilizing agent has a complex structure and mechanism of action, the research on the passivation repair mechanism of the curing agent is not enough; finally , Many technical measures in curing / stabilization are still in the stage of laboratory research or on-site small-scale test, and there is still a lack of large-scale practical engineering applications

Method used

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  • Iron-manganese oxide based heavy metal curing agent and preparation method and applications thereof
  • Iron-manganese oxide based heavy metal curing agent and preparation method and applications thereof
  • Iron-manganese oxide based heavy metal curing agent and preparation method and applications thereof

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Embodiment 1

[0038] The present embodiment provides a kind of heavy metal curing agent based on iron-manganese oxide, comprising the following components by mass percentage: ferromanganese tailings slag 15%, pH regulator 8%, humus 37%, chitosan 22% , straw ash 18%.

[0039] Of which: in ferromanganese tailings slag, SiO 2 The content is 25-30%, CaSO 4 The content is 15-20%, Fe(OH) 3 The content is 6-10%, MnO 2The content of calcium salt is 5%-10%; in the pH regulator, the content of calcium salt is 30%-40%, Mg(OH) 2 The content is 10%-15%, and the calcium salt includes at least one of calcium carbonate and calcium sulfate; in humus, the C content is 55%-60%, the N content is 4%-7%, and humic acid and humin The content is not less than 4%.

[0040] The preparation method of the above-mentioned heavy metal curing agent is as follows: respectively pulverize ferromanganese tailings, pH regulator, humus, chitosan, and straw ash, pass through a 150-mesh sieve, and then mix evenly according ...

Embodiment 2

[0043] The present embodiment provides a kind of heavy metal curing agent based on iron-manganese oxide, comprising the following components by mass percentage: 10% of ferromanganese tailings slag, 10% of pH regulator, 40% of humus, 25% of chitosan , Straw ash 15%.

[0044] Of which: in ferromanganese tailings slag, SiO 2 The content is 25-30%, CaSO 4 The content is 15-20%, Fe(OH) 3 The content is 6-10%, MnO 2 The content of calcium salt is 5%-10%; in the pH regulator, the content of calcium salt is 30%-40%, Mg(OH) 2 The content is 10%-15%, and the calcium salt includes at least one of calcium carbonate and calcium sulfate; in humus, the C content is 55%-60%, the N content is 4%-7%, and humic acid and humin The content is not less than 4%.

[0045] The preparation method of the above-mentioned heavy metal curing agent is as follows: respectively pulverize ferromanganese tailings, pH regulator, humus, chitosan, and straw ash, pass through a 100-mesh sieve, and then mix eve...

Embodiment 3

[0048] The present embodiment provides a kind of heavy metal curing agent based on iron-manganese oxide, comprising the following components by mass percentage: 20% of ferromanganese tailings slag, 10% of pH regulator, 35% of humus, 15% of chitosan , Straw ash 20%.

[0049] Of which: in ferromanganese tailings slag, SiO 2 The content is 25-30%, CaSO 4 The content is 15-20%, Fe(OH) 3 The content is 6-10%, MnO 2 The content of calcium salt is 5%-10%; in the pH regulator, the content of calcium salt is 30%-40%, Mg(OH) 2 The content is 10%-15%, and the calcium salt includes at least one of calcium carbonate and calcium sulfate; in humus, the C content is 55%-60%, the N content is 4%-7%, and humic acid and humin The content is not less than 4%.

[0050] The preparation method of the above-mentioned heavy metal curing agent is as follows: respectively pulverize ferromanganese tailings, pH regulator, humus, chitosan, and straw ash, pass through a 120-mesh sieve, and then mix uni...

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Abstract

The invention belongs to the technical field of environment protection, and specifically relates to an iron-manganese oxide based heavy metal curing agent, which comprises following components in percentage by weight: 10 to 20% of tailings of manganese ores and iron ores, 5 to 10% of a pH adjuster, 30 to 40% of humus, 15 to 25% of chitosan, and 10 to 20% of straw ash. The preparation method of the heavy metal curing agent comprises following steps: individually grinding tailings of manganese ores and iron ores, a pH adjuster, humus, chitosan, and straw ash, sieving the powder by a 100-150 mesh sieve, and evenly mixing. Then the heavy metal curing agent is applied to heavy metal polluted soil, and the heavy metal curing agent accounts for 10 to 20% of the weight of the soil. Tailings of manganese ores and iron ores are taken as the raw materials; the preparation conditions are mild; the heavy metal chelating effect of the heavy metal curing agent is good, the heavy metal curing and stabilizing performance is strong, multiple heavy metal ions can be immobilized and stabilized at the same time, and the problem that manganese tailing is difficult to utilize is solved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a heavy metal curing agent based on iron-manganese oxide and its preparation method and application. Background technique [0002] As a country with relatively rich mineral resources, the development of mineral resources plays a very important role in the process of national economic and social development. However, the development and utilization of mineral resources will also bring serious ecological and environmental problems. The tailings pond is formed by the accumulation of slag and waste soil with low residual value after mining. It invades a large amount of land and is likely to cause various secondary geological disasters due to geological disturbance. The most dangerous thing is that the heavy metal elements in the soil are mined and smelted. Effective activation, and after a long period of rain scouring and leaching, weathering and dust, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 胡国峰邵雁刘颖刘子豪郭华军向浩覃慧徐秀英
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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