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Related Concept Videos

Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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States of Matter and Phase Changes00:59

States of Matter and Phase Changes

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The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
904
Phase Transitions02:31

Phase Transitions

18.7K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
18.7K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

12.3K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Sublimation01:03

Sublimation

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Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
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Updated: Jun 2, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Using Industrial Mining Solid Waste through Conversion to Phase-Change Materials for Thermal Energy Storage.

Jiaping Jiang1, Yitong Cao1, Guo Li1

  • 1School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, PR China.

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|January 14, 2025
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Summary
This summary is machine-generated.

Industrial solid wastes like fly ash, slag, and tailings can be modified into porous matrices for phase change materials (PCMs). This review explores their use in thermal energy storage, offering solutions for waste utilization and pollution reduction.

Keywords:
Greening high value-added recyclingMining industry solid wastePorous support matrixShape-stabilized PCMs

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Mining and metallurgy generate substantial industrial solid waste annually, including fly ash (FA), slag, and tailings.
  • Improper disposal of these wastes leads to significant soil, air, and water pollution, posing risks to human health.
  • Current waste management strategies like landfilling and limited component recovery are insufficient and resource-intensive.

Purpose of the Study:

  • To review the recent research on utilizing mining industry solid wastes as matrices for phase change materials (PCMs).
  • To explore the potential of modified FA, slag, and tailings for thermal energy storage applications.
  • To provide insights into the comprehensive utilization of mining solid wastes and mitigate environmental pollution.

Main Methods:

  • Literature review of recent advancements in phase change material (PCM) applications using industrial solid wastes.
  • Analysis of the properties of FA, slag, and tailings (porosity, mechanical strength) for matrix suitability.
  • Investigation of modification treatments for these wastes to support PCMs and prevent leakage.

Main Results:

  • Mining wastes like FA, slag, and tailings possess characteristics suitable for developing porous matrices.
  • Modification treatments enable these wastes to effectively encapsulate and stabilize phase change materials.
  • Successful application of these modified wastes in thermal energy storage systems has been demonstrated.

Conclusions:

  • Modified mining solid wastes offer a promising avenue for developing efficient phase change thermal storage materials.
  • This approach provides a sustainable solution for managing industrial solid waste and reducing environmental impact.
  • Further research can optimize these materials for broader applications in thermal energy storage and waste valorization.