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Related Concept Videos

Pozzolans01:21

Pozzolans

490
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...
490
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

332
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
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Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
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Portland Cement01:21

Portland Cement

620
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...
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Types of Cement II01:22

Types of Cement II

397
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...
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Hydration of Cement01:24

Hydration of Cement

817
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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Updated: Jan 18, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Reducing Cement Clinker Sintering Temperature Using Fluorine-Containing Semiconductor Waste.

Bilguun Mend1,2, Youngjun Lee1, Jang-Ho Jay Kim2

  • 1Climate and Energy R&D Group, Korea Institute of Ceramic Engineering and Technology, Jinju 52581, Republic of Korea.

Materials (Basel, Switzerland)
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

Recycling industrial sludge in cement production lowers sintering temperatures by 150°C, reducing energy use and CO2 emissions. This process enhances cement clinker formation and promotes environmental sustainability.

Keywords:
CO2 emissionscement clinkerenergy savingsfluorine mineralizersemiconductor sludge

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Industrial sludge poses disposal challenges.
  • Portland cement clinker production is energy-intensive and generates CO2.
  • Mineralizers can improve clinker formation efficiency.

Purpose of the Study:

  • To evaluate fluorine-containing industrial sludge as a mineralizer in Portland cement clinker production.
  • To assess the impact of sludge addition on clinker properties and sintering behavior.
  • To determine the environmental and economic benefits of using sludge in cement manufacturing.

Main Methods:

  • Preparation of raw mixes with 6%, 9%, and 12% sludge replacement.
  • Sintering of mixes at temperatures ranging from 1300 to 1500 °C.
  • Analysis of clinker burnability (FreeCaO), phase composition (XRD with Rietveld refinement), and chemical integrity (XRF).

Main Results:

  • Sludge addition reduced sintering temperature by up to 150 °C, achieving near-complete clinker formation at 1300 °C.
  • Fluorine stabilized β-C2S, altered C3S phase distribution, decreased C3A content, and formed a novel Al7Ca6O16F phase.
  • Energy savings of 15-22.5% and CO2 emission reductions of 0.10-0.20 tons/ton clinker were achieved.

Conclusions:

  • Fluorine-containing industrial sludge effectively acts as a mineralizer in Portland cement clinker production.
  • Recycling sludge enhances cement production efficiency, reduces energy consumption, and lowers environmental impact.
  • This approach offers a sustainable solution for industrial waste management and cement manufacturing.