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Related Concept Videos

Hydration of Cement01:24

Hydration of Cement

185
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Washing, Drying, and Ignition of Precipitates00:52

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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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Strength and Heat of Hydration01:29

Strength and Heat of Hydration

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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
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Related Experiment Video

Updated: May 20, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Electrochemically Assisted Calcium Silicate Utilization for Phosphate Recovery.

Ju Luo1, Zhengshuo Zhan1, Weiquan Li1

  • 1Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China.

Environmental Science & Technology
|March 24, 2025
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Summary

This study introduces an electrochemically assisted calcium silicate system that achieves rapid pH swings without membranes. This innovative approach enables efficient phosphorus recovery and shows potential for direct air carbon capture.

Keywords:
carbon sequestrationelectrochemical pH-swinglocal pHphosphate recoverywollastonite

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Area of Science:

  • Environmental Science and Engineering
  • Electrochemistry
  • Materials Science

Background:

  • Electrochemical pH-swing systems are promising for chemical production, carbon capture, and water treatment.
  • Conventional systems rely on costly ion exchange membranes prone to fouling and scaling.
  • A membrane-free solution is needed for efficient and sustainable pH-swing applications.

Purpose of the Study:

  • To develop a novel membrane-free electrochemical system for rapid pH-swing.
  • To evaluate the system's efficiency in phosphorus recovery from waste streams.
  • To explore the potential of the system's effluent for direct air carbon capture.

Main Methods:

  • An electrochemically assisted calcium silicate (EACS) system was designed using a 3D-printed holder and Ru-Ir anode.
  • The system utilizes in situ generated H+ and OH- for pH swing from 8.5 to 10 within 1 hour.
  • Phosphorus recovery efficiency and energy consumption were measured; long-term continuous flow experiments were conducted.

Main Results:

  • The EACS system achieved high phosphorus recovery efficiencies ranging from 88.4% to 96.6%.
  • Energy consumption was as low as 24.4 kWh kg P−1, with sustained efficiency through mineral replacement.
  • Silicate minerals outperformed carbonate minerals in removal kinetics, product purity, and reduced carbon emissions.

Conclusions:

  • The membrane-free EACS system offers an efficient and stable method for pH swing and phosphorus recovery.
  • The system's effluent shows promise for direct air carbon capture applications.
  • This technology presents a transformative, sustainable solution for environmental remediation and industrial processes.