大规模的波特兰水泥电气回收
Cyrille F Dunant1, Shiju Joseph2, Rohit Prajapati2
1Department of Engineering, University of Cambridge, Cambridge, UK. cyrille.dunant@gmail.com.
Nature
|May 22, 2024
概括
在钢材回收过程中,可以将回收的水泥作为流体的替代品,从而产生零排放的水泥. 这种创新工艺带来了经济效益,并减少了水泥和钢铁生产中的排放.
科学领域:
- 材料科学
- 环境工程
- 可持续的化学
背景情况:
- 水泥生产对全球人为二氧化碳 (CO2) 排放做出了重大贡献,主要是通过石灰岩脱碳和化石燃料燃烧.
- 目前用于水泥生产的脱碳化策略,如补充材料替代,替代粘合剂和碳捕获,在可扩展性或减排方面面临限制.
- 使用的水泥是一种废弃产品,为新水泥生产提供了脱碳原料的机会.
研究的目的:
- 调查回收水泥作为钢材回收中的石灰多洛流的部分替代品的可行性.
- 通过这种新型回收工艺评估生产零排放水泥的潜力.
- 评估拟议方法对水泥和钢铁行业的经济可行性和环境效益.
主要方法:
- 在钢材回收过程中使用回收的水泥糊作为石灰多洛米特流体的部分替代品.
- 分析了产生的废渣,以确保它符合波特兰的现有规格.
- 研究了产生的与烧焦的粘土和石灰岩的混合性.
- 评估了该工艺对回收和废弃物中的二氧化和含量的敏感性.
主要成果:
- 在钢材回收过程中,回收的水泥可以成功地被重新连接起来,作为流体的部分替代品.
- 产生的废渣符合波特兰的现行规格,并且可以有效地与其他材料混合.
- 该工艺可以适应和含量的变化.
- 拟议的方法显示出经济竞争力的潜力,如果使用可再生能源,可以实现零排放的水泥生产.
结论:
- 在钢材回收过程中重新结合使用的水泥是一种有希望的可持续水泥生产途径.
- 这种方法可以显著减少与水泥制造相关的碳排放,并减少对原始原料的依赖.
- 这种工艺带来了双重的环境效益,因为它还减少了钢材回收过程中的石灰流量需求,与未来的建筑材料效率目标保持一致.
更多相关视频
05:38Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
Published on: March 7, 2025
239
05:52Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
Published on: June 2, 2022
2.9K
相关概念视频
01:21Portland Cement
217
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
217
01:22Types of Cement II
107
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
107
01:30Ferrocement
168
Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
168
01:26Design Example: Sustainability in Concrete Building
167
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
167
01:21Pozzolans
111
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
111
01:24Hydration of Cement
223
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...
223