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Related Concept Videos

Precipitation Gravimetry01:03

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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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.
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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Develop spinel structure and quantify phase transformation for nickel stabilization in electroplating sludge.

Yunxue Xia1, Fanling Meng2, Zhong Lv2

  • 1State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Nanshan District, Shenzhen 518055, PR China; Department of Civil Engineering, Faculty of Engineering, The University of Hong Kong, Hong Kong Special Administrative Region.

Waste Management (New York, N.Y.)
|July 1, 2021
PubMed
Summary
This summary is machine-generated.

This study stabilizes hazardous nickel sludge by ceramic sintering, transforming nickel into stable spinel structures. This method significantly reduces nickel leachability, offering a viable solution for industrial waste treatment and utilization.

Keywords:
Ni sludgePhase transformationQuantifySpinelStabilization

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Inorganic Chemistry

Background:

  • Nickel-laden electroplating sludge poses significant environmental risks.
  • Effective stabilization methods are crucial for managing hazardous industrial waste.

Purpose of the Study:

  • To develop a strategy for stabilizing nickel (Ni) in electroplating sludge.
  • To investigate the transformation of nickel into stable crystal structures via ceramic sintering.

Main Methods:

  • Collected nickel sludge was fired with ceramic precursors (α-Fe2O3 and γ-Al2O3) at 700-1400°C.
  • Phase identification and Rietveld refinement were used to analyze sintered products.
  • Prolonged leaching tests evaluated nickel stabilization efficiency.

Main Results:

  • Nickel transformed into NiFe2O4 and NiAl2O4 spinel structures, reaching high weight fractions (up to 87.7% and 83.1%).
  • Nickel transformation ratios reached 99.9% and 99.7%, indicating near-complete incorporation.
  • Nickel leachability decreased dramatically, with leached ratios below 0.06% after 20-day leaching.

Conclusions:

  • Ceramic sintering effectively stabilizes nickel in electroplating sludge by forming stable spinel structures.
  • This method provides a promising strategy for the treatment and beneficial utilization of heavy metal-laden industrial waste.