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Related Concept Videos

Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

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Related Experiment Video

Updated: May 22, 2026

Automated Counterflow Centrifugal System for Small-Scale Cell Processing
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Published on: December 12, 2019

Processing of electronic waste in a counter current teeter-bed separator.

Sujit Kumar Dey1, Vidyadhar Ari, Avimanyu Das

  • 1CSIR-NML, Burma Mines, Jamshedpur, Jharkhand 831007, India.

Journal of Environmental Management
|May 15, 2012
PubMed
Summary

This study shows the Floatex Density Separator (FDS) effectively recovers metals from electronic waste (e-waste) through wet processing. A single FDS stage enriched metal content to 37%, with further enrichment to 48.2% possible in a two-stage process.

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
09:50

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Electronic waste (e-waste) presents a growing environmental challenge due to its complex composition and valuable metal content.
  • Traditional e-waste recycling methods often involve energy-intensive processes or result in significant metal losses.
  • Efficient physical separation techniques are crucial for sustainable e-waste management and resource recovery.

Purpose of the Study:

  • To investigate the efficacy of advanced gravity separation for recovering metal values from ground e-waste.
  • To evaluate the performance of the Floatex Density Separator (FDS) in wet processing of e-waste.
  • To determine optimal operating conditions for maximizing metal recovery and grade.

Main Methods:

  • Utilized a teeter-bed separator, specifically the Floatex Density Separator (FDS), for gravity-based separation of ground e-waste.
  • Conducted single-stage and two-stage processing experiments to assess metal enrichment.
  • Quantified the influence of operating variables: teeter water flow rate, bed pressure, and feed rate.

Main Results:

  • Achieved a metal enrichment from 23% in the feed to 37% in the product in a single FDS stage with over 95% metal recovery.
  • A two-stage processing scheme further enhanced metal content to 48.2%.
  • Identified optimal conditions for a single pass: 6.6 l pm teeter water rate, 5.27 kPa bed pressure, and 82 kg/hr feed rate, yielding 37% metal content.

Conclusions:

  • The Floatex Density Separator (FDS) is a viable technology for the physical recovery of metal values from e-waste via wet processing.
  • Operating parameters significantly influence mass yield and product grade, with trade-offs between the two.
  • Optimized process conditions can achieve substantial metal enrichment in a single stage, contributing to more sustainable e-waste recycling.