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相关概念视频

Phase Changes01:19

Phase Changes

4.1K
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...
4.1K
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

16.7K
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...
16.7K
States of Matter and Phase Changes00:59

States of Matter and Phase Changes

904
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...
12.3K
Sublimation01:03

Sublimation

705
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...
705

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相关实验视频

Updated: Jun 2, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
11:14

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

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使用工业采矿 通过将固体废物转化为相变材料来储存热能,从而将固体废物转化为相变材料.

Jiaping Jiang1, Yitong Cao1, Guo Li1

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

ChemPlusChem
|January 14, 2025
PubMed
概括

工业固体废物,如飞灰,渣和尾矿,可以被改造为可变相材料 (PCM) 的多孔矩阵. 本综述探讨了它们在热能储存中的应用,为废物利用和减少污染提供了解决方案.

关键词:
绿化高附加值的回收利用.采矿行业的固体废物 采矿行业的固体废物毛孔的支矩阵是多孔的稳定形状的PCM可以使用.

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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Transformation of Organic Household Leftovers into a Peat Substitute
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相关实验视频

Last 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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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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Transformation of Organic Household Leftovers into a Peat Substitute
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科学领域:

  • 材料科学 材料科学 材料科学
  • 环境工程 环境工程
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 矿业和金业每年产生大量的工业固体废物,包括飞灰 (FA),渣和尾矿.
  • 这些废物的不适当处置会导致严重的土壤,空气和水污染,对人类健康构成风险.
  • 目前的废物管理策略,如垃圾填埋和有限的组件回收是不够的和资源密集的.

研究的目的:

  • 对利用矿业固体废物作为相变材料 (PCM) 矩阵的最新研究进行审查.
  • 探索改性FA,渣渣和尾矿在热能储存应用中的潜力.
  • 提供对采矿固体废物的全面利用和减轻环境污染的见解.

主要方法:

  • 关于使用工业固体废物进行相变材料 (PCM) 应用的最新进展的文献综述.
  • 分析FA,渣渣和尾矿的特性 (孔隙性,机械强度) 适用于矩阵.
  • 对这些废物进行修改处理的调查,以支持PCM并防止泄漏.

主要成果:

  • 矿业废物如FA,渣和尾矿具有适合开发多孔矩阵的特性.
  • 修改处理使这些废物能够有效地封装和稳定相变材料.
  • 这些改性废物在热能储能系统中的成功应用已被证明.

结论:

  • 改性采矿固体废物为开发高效的相变热储存材料提供了一个有希望的途径.
  • 这种方法为管理工业固体废物和减少对环境的影响提供了可持续的解决方案.
  • 进一步的研究可以优化这些材料,用于热能储存和废物回收利用的更广泛的应用.