Heavy metal ion adsorbent and method and apparatus for treating wastewater containing heavy metal ions

A heavy metal ion adsorbent using iron, magnetite, and hematite with silica addresses the challenges of ion release and system complexity in wastewater treatment, achieving efficient and cost-effective removal of heavy metals in critical environments.

JP7882821B2Active Publication Date: 2026-06-30ICUS CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
ICUS CO LTD
Filing Date
2023-09-20
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for treating heavy metal ion-containing wastewater face challenges such as the release of Na and Fe ions into treated water, difficulty in managing conductivity and ion species, high energy consumption, complex system requirements, and inefficient solid-liquid separation, particularly in critical environments like thermal and nuclear power plants.

Method used

A heavy metal ion adsorbent composed of specific proportions of iron, magnetite, hematite, and silica, which undergoes a substitution reaction with heavy metal ions at room temperature without acids, allowing for efficient adsorption and magnetization/hematization of iron ions, reducing their presence in treated water.

Benefits of technology

The method effectively treats heavy metal ions in wastewater at room temperature, minimizing iron ion release, simplifying apparatus configuration, and extending adsorbent lifespan, suitable for environments requiring strict conductivity and ion species control.

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Patent Text Reader

Abstract

To provide a heavy metal ion-containing drain water treatment method and apparatus which can let no iron ion derived from an adsorbent remain in treatment water or can reduce the iron ions to such a degree that they are ignorable even in heavy metal ion-containing drain water treatment that management of conductivity and ion species is severe, and a heavy metal ion adsorbent.SOLUTION: A heavy metal ion adsorbent contains 48 mass% or more and 68 mass% or less Fe, 20 mass% or more and 50 mass% or less Fe3O4, 6.5 mass% or more and 11.6 mass% or less Fe2O3, 0.3 mass% or more and 1.6 mass% or less SiO2, the balance with unavoidable impurities.SELECTED DRAWING: None
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