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Dolomitic Quicklime
Names
Dolime; Mag Lime; Fluxing Lime; Dolomitic Lime; Kemidol Oxide; Calcium Magnesium Oxide
Insight Articles
#PS789
calciumoxide calciummagnesiumoxide lime quicklime burntlime dolomite dolomiticquicklime
Main Product
Calcium Oxide
Segment
Chemicals
Main-Family
Inorganics
Sub-Family
Inorganic Oxides
Physical State

Solid

Description

Dolomitic quicklime is produced by the calcination of dolomite (CaMg(CO₃)₂) at temperatures above ~1,100°F (593°C), yielding a mixed calcium-magnesium oxide product (CaO·MgO) in which both oxides are present in near-equal proportions. It is classified as a mixture rather than a single compound, and is commercially registered under the calcium magnesium oxide CAS number. Its dual-oxide chemistry imparts distinct advantages over high-calcium quicklime in applications where both CaO and MgO contribute to the process — most notably in steelmaking slag control and refractory applications.

Physical & Chemical Properties

Property Value
Appearance White to grayish-white lumps, pebbles, granules, or powder
CaO content 55–65%
MgO content 32–40%
SiO₂ content ≤1.5%
Molecular Weight 96.39 g/mol (CaO·MgO)
Density ~3.0–3.2 g/cm³
Bulk density 900–1,100 kg/m³
pH (saturated solution) >12
Slaking reactivity Slower than high-calcium (MgO hydrates sluggishly)
Available sizing Lump, pebble, granular, pulverized ​

 

Key Applications

  • Steelmaking flux (BOS, EAF) — MgO content protects magnesia refractory linings while CaO removes impurities
  • Refractory manufacture and repair
  • Soil stabilization and road construction
  • Water treatment (Mg²⁺ co-precipitation benefits)
  • Environmental remediation

References

  1. Carmeuse Americas (Mar 2024). Product Safety Datasheet: High Calcium Quicklime
  2. Carmeuse Americas (Mar 2024). Product Safety Datasheet: Magnesium Enhanced Quicklime
  3. Tradeasia International (Feb 2, 2020). What Is Quicklime? Types, Properties, And Uses
  4. Graymont (Nov 4, 2025). Safety Datasheet: High Calcium Quicklime
  5. Graymont (May 7, 2025). Safety Datasheet: Dolomite Quicklime
  6. HiTech Minerals and Chemicals Group. Understanding Quick Lime: Types, Properties, and Applications (Accessed Mar 14, 2026)
  7. The National Lime & Stone Company (Sep 12, 2024). Safety Data Sheet: Dried Dolomite – Industrial Mineral Products
  8. Peter Chemical Company. 019). Calcium Oxide or Quicklime (Accessed Mar 14, 2026)
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Products Picture
Dolomitic quicklime | Source: Carmeuse https://www.carmeuse.com/na-en/products/dolomitic-quicklime
Identifiers
logo CAS Number
37247-91-9
logo EC Number
253-425-0
logo ECHA InfoCard
100.048.551
logo IUPAC Name
Calcium magnesium oxide
Chemical Data
Chemical Formula

CaO·MgO

Molecular Weight (g/mol)
96.39
Sulfur Content (wt%)
0
Specific Gravity
3.10
Crude Data
API Gravity
-85.85
Country
Product Settings
Default
Status
A
Content provided by
Transaction Name Date
Modified by UserPic   Kokel, Nicolas 3/14/2026 4:18 PM
Added by UserPic   Kokel, Nicolas 3/14/2026 3:10 PM