Clinker
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Clinker

Portland Cement Clinker is the essential ingredient of Portland Cement. Portland Cement is obtained by grinding Clinker with only minor amounts of a few other minerals, so its composition does not depart far from that of Clinker. Other Cements (i.e. non-Portland Cements, for example pozzolanic Cements, blast furnace slag Cements, limestone Cements and masonry Cements) contain larger amounts of other minerals and have a much wider composition range. Although the other potential ingredients may be cheap natural materials, Clinker is made in an energy-intensive chemical process. Between one and two billion tons a year of Clinker are made world-wide, and the details of its formation are therefore of great economic significance, since no viable alternative ingredients for making Cement-like materials currently exist.
Unlike many other thermal products (e.g. aluminium, pig-iron), Clinker is a fairly complex mixture of different minerals, and so its production depends on a multi-dimensional control of raw materials and a multi-staged heat treatment. It has been likened to a "man-made igneous rock", and an understanding of its structure and chemistry requires the application of many principles of geochemistry.

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Portland Cement Clinker consists essentially of four minerals:

  • Alite: approximately tricalcium silicate (typically about 65% of the total)
  • Belite: approximately dicalcium silicate (typically about 15% of the total)
  • Tricalcium Aluminate: Typically about 7% of the total
  • Tetracalcium Aluminoferrite: Typically about 8% of the total

There are also many other non-essential minerals that occur in small quantities. The balance is made up of alkali sulfates and minor impurities. The typical mineral contents shown are subject to wide variation. Clinker consists of various calcium silicates including alite and belite. Tricalcium aluminate and calcium aluminoferrite are other common components. These components are often generated in situ by heating various clays and limestone.

Portland Cement Clinker is made by heating in a rotary kiln at high temperature a homogeneous mixture of raw materials. The products of the chemical reaction aggregate together at their sintering temperature, about 1,450°C (2,640°F). Aluminium oxide and iron oxide are present only as a flux to reduce the sintering temperature and contribute little to the Cement strength. Portland Cement Clinker is ground to a fine powder and used as the binder in many Cement products. A little gypsum is sometimes added. Clinker, if stored in dry conditions, can be kept for several months without appreciable loss of quality. Because of this, and because it can easily be handled by ordinary mineral handling equipment, Clinker is traded internationally in large quantities. Cement manufacturers purchasing Clinker usually grind it as an addition to their own Clinker at their Cement plants. Manufacturers also ship Clinker to grinding plants in areas where Cement-making raw materials are not available. Iran is the best Clinker supplier in Middle East and has a great ability to export Clinker. MGT Mineral Company can provide all crucial conditions and trading relationships for Clinker exporting.

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Clinker 1-525 (M500) Standard Tests

The following table contains standard tests for Clinker 1-525 (M500). MGT Mineral Company can provide all necessary trading communication to export Clinker 1-525 (M500) with these characteristics.

Clinker 1-525 (M500)
Component ISIRI 389 Iranian standard test result
SiO2 - 22.50 %
Al2O3 - 5.50 %
Fe2O3 - 3.46 %
CaO - 65.46 %
MgO <5 1.10 %
SO3 <3.5 0.31 %
Insoluble Residue <0.70 0.25 %
Loss On Ignation <3.00 0.30 %
K2O - 0.60 %
Na2O - 0.35 %
Free CaO - 1.20 %
Liter Weight - 1250 g/lit
Lime Saturation Factor (LSF) - 91.25 %
Silica Modulus (SM) - 2.51 %
Alumina Modulus (AM) - 1.59 %
C3S - 53.55 %
C2S - 24.11 %
C3A - 8.72 %
C4AF - 10.53 %

Clinker 1-425 (M400) Standard Tests

The following table contains standard tests for Clinker 1-425 (M400). MGT Mineral Company can provide all necessary trading relationships to export Clinker 1-425 (M400) with these characteristics.

Clinker 1-425 (M400)
Component ISIRI 389 Iranian standard test result
SiO2 - 23.10 %
Al2O3 - 5.30 %
Fe2O3 - 3.42 %
CaO - 65.55 %
MgO <5 1.05 %
SO3 <3.5 0.25 %
Insoluble Residue <0.70 0.14 %
Loss On Ignation <3.00 0.25 %
K2O - 0.65 %
Na2O - 0.30 %
Free CaO - 1.00 %
Liter Weight - 1250 g/lit
Lime Saturation Factor (LSF) - 89.60 %
Silica Modulus (SM) - 2.51 %
Alumina Modulus (AM) - 1.55 %
C3S - 50.75 %
C2S - 27.94 %
C3A - 8.26 %
C4AF - 10.41 %

Clinker Type II Standard Tests

The following table contains standard tests for Clinker Type II. MGT Mineral Company can provide all necessary trading relationships to export Clinker Type II with these characteristics.

Clinker Type II (Moderate Sulphate Resistance)
Component ISIRI 389 Iranian standard test result
SiO2 >20.00 22.85 %
Al2O3 <6 4.98 %
Fe2O3 <6 3.52 %
CaO - 65.55 %
MgO <5 1.12 %
SO3 <3.5 0.25 %
Insoluble Residue <0.70 0.13 %
Loss On Ignation <3.00 0.23 %
K2O - 0.56 %
Na2O - 0.3 %
Free CaO - 0.90 %
Liter Weight - 1260 g/lit
Lime Saturation Factor (LSF) - 90.86 %
Silica Modulus (SM) - 2.69 %
Alumina Modulus (AM) - 1.41 %
C3S - 54.66 %
C2S - 24.28 %
C3A - 7.24 %
C4AF - 10.71 %
Setting time (Vicat, Initial) - 135 (min)
Setting time (Vicat, Final) - 195 (min)
Expansion(Autoclave) - 0.09 %
Specific Surface Area (Blaine) - 3152 (Cm2/g)
Residue on 90µ sieve - 1.4 %
Compressive Strength (3 days) - 230 (Kg/Cm2)
Compressive Strength (7 days) - 325 (Kg/Cm2)
Compressive Strength (28 days) - 498 (Kg/Cm2)
 

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