Stabilization of Hazardous Materials into Ferrites
Stabilization of Hazardous Materials into Ferrites
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DOI：
10.2166/wst.1991.0438
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发表时间：
1991
影响因子：
2.7
通讯作者：
Y. Tamaura;P. Tu;S. Rojarayanont;H. Abe
中科院分区：
文献类型：
--
作者：
Y. Tamaura;P. Tu;S. Rojarayanont;H. Abe
研究了Fe 3 O 4 涂层法对有害物质的稳定作用。在水溶液中的铁氧体形成反应中，金属离子的吸附和所吸附的Fe(II)离子的氧化在铁氧体颗粒的表面上重复进行。该反应被用于用Fe 3 O 4 （或铁氧体）涂覆危险材料。通过重复l)将Fe(II)水溶液添加到有害物质悬浮液中，以及2)使空气通过反应悬浮液进行氧化两个步骤，利用Fe 3 O 4 层，我们可以覆盖有害物质的表面，例如中和沉淀过程中产生的重金属污泥、含有氟离子和有害金属离子的废水处理中的CaF 2 沉淀以及含有Cd(II)离子的土壤。这些Fe 3 O 4 包覆的有害物质非常稳定，在正常环境条件下不会浸出重金属离子。通过本方法和热处理，“铁氧体工艺”中形成的铁氧体污泥高度稳定。
Stabilization of the hazardous materials by the Fe 3 O 4 -coating method was studied. In the ferrite-formation reaction in the aqueous solution, the adsorption of the metal ions and the oxidation of the adsorbed Fe(II) ions are repeated on the surface of the ferrite particles. This reaction was adopted to the coating of the hazardous materials with the Fe 3 O 4 (or ferrite). By repeating the two steps of l)the addition of the Fe(II) aqueous solution into the suspension of the hazardous materials, and 2)the oxidation by passing air through the reaction suspension, with the Fe 3 O 4 layer, we could coat the surfaces of the hazardous materials, such as the heavy metal sludge from the neutralization-precipitation process, the CaF 2 precipitates in the treatment of the waste waters containing fluoride ion along with hazardous metal ions, and the soils containing Cd(II) ion. These Fe 3 O 4 -coated hazardous materials are very stable and no heavy metal ions are leached under the normal environmental conditions. The ferrite sludges formed in the “Ferrite Process” were highly stabilized by the present method, and by the heat-treatment.