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Precipitated Calcium Carbonate

Raw Materials

Natural Limestone

Manufactured Process Summary

We prefer natural limestone to be calcined, and thus the limestone is reduced to calcium oxide (CaO). The calcium oxide is reacted with pure water (H2O) to form calcium hydroxide (Ca(OH)2). The liquid calcium hydroxide is reacted with carbon dioxide (CO2) to form calcium carbonate (CaCO3). After the calcium carbonate is dehydrated, crumbled, and packaged, it is called light calcium carbonate (also known as precipitated calcium carbonate or synthesized calcium carbonate). The quality of light calcium carbonate depends not only on the quality of the natural limestone used, but also on the chemically reactive conditions of calcination etc. and the grade of the fineness.

Product Introduction

Calcium carbonate is an important inorganic compound, which is the most commonly used filler in manufacturing and processing industries. In general, calcium carbonate is widely used in rubber, plastics, papermaking, ink, paints, building materials, cropper, fruit farming, food products, medicine, etc. The manufactured process of calcium carbonate is universally generalized into two categories, and the properties of the two categories show slight variations. One is light calcium carbonate, which is achieved by chemical synthesis. The other is heavy calcium carbonate, which is achieved by physical pulverization. The major difference between the light and heavy calcium carbonates is the variations of the pH value, the fineness, and the particle shape. The light calcium carbonate is mainly spindle shaped, and the heavy calcium carbonate is mainly irregularly shaped. The different of the finesses and shape cause the variation of the bulk density (i.e. false specific gravity). Among the various calcium carbonates, users can select the most suitable one based on applied conditions or individual purpose to achieve the expected effect.

Product Specifications

Property

B-201

A-101

A-201

H-301

Physical

Bulk density (g/cm3)

0.55

0.66

0.80

0.92

True specific gravity (g/cm3)

2.6~2.7

2.6~2.7

2.6~2.7

2.6~2.7

Residue on 325 mesh

max. 0.5%

max. 0.5%

max. 0.5%

max. 0.5%

whiteness (%GE)

96

96

95

95

Oil absorption (ml/100g)

50

42

34

26

Settling volume (ml/g)

3.3±0.2

2.9±0.2

2.6±0.2

2.2±0.2

Moisture

max. 0.8%

max. 0.8%

max. 0.8%

max. 0.8%

chemical

Assay of CaCO3

98.5%

98.5%

97.5%

97%

Insoluble in HCl

max. 1.5%

max. 1.5%

max. 1.5%

max. 1.5%

SiO2

max. 1.0%

max. 1.0%

max. 1.0%

max. 1.0%

MgO

max. 0.6%

max. 0.6%

max. 0.6%

max. 0.6%

Fe2O3

max. 0.3%

max. 0.3%

max. 0.3%

max. 0.3%

Al2O3

max. 0.3%

max. 0.3%

max. 0.3%

max. 0.3%

Loss on ignition

43±1.5%

43±1.5%

43±1.5%

43±1.5%

pH value

9.0±1

9.0±1

9.0±1

9.0±1

(The above table is provided for reference only)

Scanning Electron Microscope(SEM)

Product characteristics

  • The particle size is smaller than that of heavy calcium carbonate; better fineness.
  • Better whiteness.
  • Less impurities; high purity.
  • The appearance is mainly spindle or spherical shape.
  • Good dispersion,
  • The product is superior, and users could choose the type according to the applicable bulk density and oil absorption.

Applications

  • Apply to rubber and plastic industries: Calcium carbonate plays the role of contamination-free filler in the material. It is extensively used in tires, tapes, rubber tubes, oil seal, and component parts of the rubber. It is often used in polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, nylon, etc. products in the plastic industry. Not only is calcium carbonate used alone as a reinforced filler, but also it can be used together with other fillers , such as carbon black, white carbon black, clay, or titanium dioxide powder, to achieve reinforcing, filling, coloring, improving working and product performance, reducing latex content or replacing partial high-priced white fillers.
  • Apply to paints: synthetic resin paints, glazes, oil-based paints, latex paints, primer paints.
  • Apply to agriculture and animal husbandry: soil modification, cropper protective agent, the additives of fertilizer or fodder, mushrooms cultivation (such as shiitake), etc.
  • Apply to medicine or health-care food: calcium tablets, calcium-supplemental agents, capsules, tablets, the calcareous source of the food, etc.
  • Apply to articles for daily use:tooth paste, tooth powder, environment-friendly (garbage) bags, etc.

Package

The appearance of the product is white powder, which is packaged in a three-layered kraft sack per twenty five kilograms or a bag per one thousand kilograms.