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Achim Associates pvt ltd

1.ORDINARY PORTLAND CLINKER
2.POZZOLANA CLINKER

With certificates of quality, weight, packing and loading issued by independent inspection agencies, we manufacture and supply quality clinker conforming to the following standards:

A particular brand, country of origin, etc. are not factors which influence the quality and consistency of the clinkers which is a big misconception on the side of the Buyers – rather, quality depends on the sequence of the clinker formation, specification or standards followed, etc., - sulfate and alcali contents of the clinker much affect the quality of clinker.

Analysis of clinker sample

No of Item Percentage
%
SIO2
ISIRI(1692)
21.57
%
CaO
ISIRI(1692)
65.04
%
MgO
ISIRI(1692)
1.61
%
Fe2O3
ISIRI(1692)
4.66
%
Al2O3
ISIRI(1692)
3.95
%
Na2O
ISIRI(1695)
%
K2O
ISIRI(1695)
0.73
%
SO3
ISIRI(1692)
0.32
%
Cl
ISIRI(6443)
0.014
%
K2O
ISIRI(1693-2)
1.12
%
L.O.l
0.16
(ppm)
Cr
202

General knowledge

Clinkers are of two major colours - white and grey. Cement clinkers are formed by the heat processing of cement elements in a kiln. Limestone, clay, bauxite, and iron ore sand in specific proportions are heated in a rotating kiln at 2,770° Fahrenheit (1,400° Celsius) until they begin to form cinder lumps, which are also known as cement clinkers. These are usually ground with gypsum to produce the fine powder later mixed with liquid to produce cement, although some manufacturers ship clinkers in their lump form to cut down on dust.

The clinker manufacturing process starts with the extraction of the raw meal from the homogenization silo to insure that the raw meal is stable and homogenized in order to produce consistent clinker quality. The preheating of the material takes place in pre-heater cyclones fitted with a pre-calciner fired with petroleum, natural gas or coal. The calcinations of the material begin during this stage, changing its phase to the oxide phase for each component to be ready for the burning process. The burning phase takes place in a rotary kiln. The clinker temperature in the kiln burning zone has to reach 1,500°C and then it is cooled in a cooler by air which decreases the temperature. The entire manufacturing process is continuously monitored and controlled from the central control room. The clinker is ground with an amount of gypsum to a fine powder in order to regulate the setting time of cement and to gain the most important property of cement, which is compressive strength. 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.


Clinker and Cement analysis

The early analyses were all based upon classical “wet” methods involving dissolution of the material, then estimating components gravimetrically – i.e. by precipitating and weighing them – or volumetrically by titration with a reagent that reacts with the element in question. Without going into excessive detail, the most important parts of the analysis scheme consisted of:

Dissolving the sample in acid (properly made clinker dissolves in hydrochloric acid very easily and completely).

Weigh what little fails to dissolve as “insoluble residue”.

Reduce the pH to precipitate silica: ignite and weigh it.

Neutralize with ammonia, precipitating “R2O3” - consisting of most of the Al2O3, Fe2O3, TiO2, P2O5 and Mn2O3. This is ignited and weighed.

Add ammonium oxalate to precipitate calcium oxalate: ignite it to CaO and weigh.

ChiConcentrate the remaining solution and add ammonium phosphate to precipitate MgNH4PO4: ignite it to Mg2P2O7 and weigh.

Redissolve the “R2O3” in acid and separately determine Fe2O3 by selective precipitation or by a redox reaction.

The last stage was often missed out in early analyses. SO3 was measured on a fresh sample by precipitation as BaSO4. This was a typical cement plant analysis: from early times, more scientific investigations performed additional analysis for Na, P, Cl, K, Ti, Mn, Zn, Sr, Ba, etc. No even moderately accurate method of analysis for Al2O3 existed until the arrival of XRF in the 1960s.

Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It most commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal, and fecal debris. It can also be a chemical sedimentary rock formed by the precipitation of calcium carbonate from lake or ocean water.

Most limestones form in shallow, calm, warm marine waters. That type of environment is where organisms capable of forming calcium carbonate shells and skeletons can easily extract the needed ingredients from ocean water. When these animals die, their shell and skeletal debris accumulate as a sediment that might be lithified into limestone. Their waste products can also contribute to the sediment mass. Limestones formed from this type of sediment are biological sedimentary rocks. Their biological origin is often revealed in the rock by the presence of fossils.

MGT Mineral Company as a major producer, supplier and exporter of several minerals and materials in the Middle East, is located in Iran. MGT Mineral Company has a lot of experience in exporting and is active in case of Gypsum supplying.

As it is proved by its presence in the Egyptian pyramids, Gypsum has served as a vital piece of several famous construction projects throughout history. Over thousands of years, this significant mineral has demonstrated its sturdiness and versatility and has become a staple in today’s structures.

Gypsum has been used in construction since the ancient Egypt era, where it was used in building the Pyramids. Some of these constructions are still visible over 5,000 years later, a tribute to Gypsum’s permanence as a building material.

Alabaster is a form of Gypsum which is used in building and also as a decorative material. In the 18th century, the French chemist Lavoisier began a modern research on Gypsum by studying its chemical properties. Farmers also used natural Gypsum as a soil additive to increase crop yields.

Iran has considerable Gypsum production and has incredible ability for exporting. MGT Mineral Company is able to manage all essential actions for exporting Gypsum.

Physical test Chemical test
Water/plaster factor(%):77.95 SO3(%):53.42
Initial Setting Time(min):9:40 CaSO4(%):90.81
Final Setting Time(min):19:10 Chemical Water(%):5.41
Flexural Strenght(N/mm2):4,19
Compressive Strength(N/mm2):12.25
Surface Hardness(N/mm2):1.33
Bulk Density(kg/m2):1480
Remain on Sieve(Mesh No 16;%):0.0
Remain on Sieve(Mesh No 50;%):2.5
Remain on Sieve(Mesh No 60;%):3.5
Remain on Sieve(Mesh No 80;%):3.5
Remain on Sieve(Mesh No 120;%):4.5
Remain on Sieve(Mesh No 170;%):4.5

What is Gypsum?

Gypsum is an evaporate mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite and dolomite. Gypsum (CaSO4.2H2O) is very similar to Anhydrite (CaSO4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate mineral.

Physical Properties of Lead
Chemical FormulaCaSO4.2H2O
Cleavage{010} Perfect, {100} Distinct, {011} Distinct
SystemMonoclinic

Gypsum building plasters are used extensively abroad for general building operations and the manufacture of pre-formed gypsum building products like tiles, blocks, plaster board etc, which have the specific advantage of lightness and high fire resistance.

Now as there is boom in the real estate in India, the builders and contractors wants time saving in construction, therefore they choose gypsum plaster due to its superior finish and time saving aspect. Now a days, the construction sector has observe a number of new tendency, technology advancements and improvement across application, all meant at making construction faster and delivering higher performance. Gypsum surface plaster is one type that has drawn the attention on the construction sector and is getting higher popularity these days.

Gypsum is a chalk like material light in weight. It is crystalline combination of calcium sulphate and water. It is available as natural gypsum, which is mined all over the world, and as synthetic by product of major industries such as fossil-fuelled power stations. Gypsum products such as molding, design piece around fan and corner design pieces and many more have been used for past time in the construction field and are the material of choice because of gypsum’s unique properties. Gypsum plaster has very good insulation properties both thermal and acoustic. Gypsum plaster has properties like fire protection, moisture resistance, impact resistance and vapor control.

In general case after the construction of wall either with bricks or with blocks, the wall internal surface is finished with cement sand plaster and white washed or painted as the case may be but this surface remain rough. For getting smooth surface Plaster of Paris i.e. POP is applied on the plaster surface before painting or distempering the wall. In this way two stage process involves which takes lot of time and labor, this form of internal finishing being slowly replaced by a direct single coat application of gypsum plaster. Therefore gypsum plaster is in fact a replacement of two different processes i.e. cement sand plastering & POP pruning.

Application of Gypsum Plaster

The materials used in the two stage finish i.e. plaster and POP are cement, sand, water and POP/ putty, where as in gypsum plaster, gypsum and water is required for plastering. Gypsum is mixed with water and applied on the wall within level strips and finished to a smooth surface with steel trowels/ steel float and ensures line and level leaving no undulation in the surface completely made good. The finished surface should be smooth, true to plane, slopes or curves. After drying the surface should be sand papered to give smooth surface. In this way there is saving in time for curing cement sand plaster and time for leveling coat of POP. Cement should not be mixed with Gypsum plaster.