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Calcium Oxide (Quick Lime, Unslaked Lime) CaO

Raw Materials

Natural Limestone

Manufactured Process Summary

The natural limestone is calcined at 1100 degrees Celsius, and thus the limestone is reduced to calcium oxide (CaO). After the calcium carbonate is classified by fineness, and packaged, it is called calcium oxide (also known as quick lime or unslaked lime).

Product Introduction

Calcium oxide is commonly called quick lime or unslaked lime, which appears as class white lump or sand granular and has the density of 3.35 g/cm3. It can be slightly soluble in water and shows strong base. It will gradually absorb water and gas in the air to be changed into calcium hydroxide or calcium carbonate. It shows as exothermic reaction when changed into calcium hydroxide emulsion in the water. Calcium oxide would be soluble in acids and be commonly applied to desiccant dehydration, acid-base neutralization, and modification of acidic soil.

 

Powdery Lime Lump Lime
(For reference only, please take the material object as standard)

Product Specifications

Property Type

 

Lump Lime
(Block Lime)

Granular Lime
(Quicklime tablets)

Powdery Lime
(Quicklime powder)

Appearance

White block

White sand-like

白色粉状

Particle size

5-20cm

1cm以下

0.2cm以下

Assay of CaO

96%

90%

90%

CaCO3

max. 4%

max. 10%

max. 10%

SiO2

max. 2.0%

max.3.0%

max.3.0%

MgO

max. 1.0%

max. 2.0%

max. 2.0%

Fe2O3

max. 0.8%

max. 1.0%

max. 1.0%

Al2O3

max. 0.8%

max. 1.0%

max. 1.0%

pH value

12.5±1

12.5±1

12.5±1

(The above table is provided for reference only)

Product characteristics

  • Moderately strong base and has the appearance of white lumps or granular sand.
  • The product is superior; users could choose the type according to the applicable purity and particle size.

Applications

  • Apply to environmental friendly neutralization: wastewater purification; acid-base neutralization, drying, and exhaust desulfurization of chemical works
  • Apply to desiccant dehydration: the additives of waste soil for moisture absorption and smell elimination; moisture absorption, defoaming, drying of rubber and plastics
  • Apply to building materials: architectural paints, hygroscopic filler agent, caulking coagulant of gypsum board, etc.
  • Apply to agriculture and animal husbandry: lower or improve soil acidity in agriculture
  • Apply to others: metallurgical cosolvent, production of calcium carbide, papermaking, oil lubricants, etc

Package

The product is packaged in a moisture-proof woven bag per twenty, twenty five, or one thousand kilograms.(Tank cars transporting)