# What is lime and why it matters for industry

- Link: https://www.directorstalkinterviews.com/what-is-lime-and-why-it-matters-for-industry/4121222208
- Published: 2025-10-22T10:07:00+01:00
- Author: Amilia Stone

Limestone is a naturally abundant sedimentary rock composed largely of calcium carbonate(
CaCO₃) or dolomite (calcium magnesium carbonate). Through a process called calcination,
heating to around 900 °C, limestone loses carbon dioxide and transforms into calcium
oxide (CaO), commonly known as quicklime. Following this, quicklime can react with
water to form calcium hydroxide (Ca(OH)₂), or hydrated lime.

Quicklime (CaO) is a white or greyish‑white solid with a density of around 3.34 g/
cm³. It reacts vigorously with water, converting into hydrated lime. Its performance
and purity depend significantly on the original limestone composition, for example,
a high‑calcium lime may contain over 97 % CaO with low magnesium oxide (MgO) content,
while a dolomitic variety may contain substantial MgO.

Industrially, lime is a critically important basic material. Quicklime finds application
across multiple sectors: in steelmaking it acts as a flux and impurity‑remover; 
in paper and pulp it aids bleaching and purification; in water treatment it softens
water and removes contaminants; in construction and civil engineering it stabilises
clay‑rich soils; and in non‑ferrous metallurgy (including copper, gold, aluminium,
lithium, nickel) it features in flow sheets. Hydrated lime serves other uses, for
example in building construction and chemical manufacturing.

_**[Firering Strategic Minerals plc](https://www.directorstalkinterviews.com/company/firering-strategic-minerals-plc/frg.l)**(
LON:FRG) is an emerging quicklime producer and critical minerals explorer, with 
operations in Zambia and West Africa._

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