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 a homogeneous mixture of raw materials in a rotary kiln at high temperature. The products of the chemical reaction aggregate together at their sintering temperature, about 1,450 C (2,640 F). Aluminum oxide and iron oxide are present only as a flux to reduce the sintering temperature and contribute little to the cement strength. For special cements, such as low heat (LH) and sulfate resistant (SR) types, it is necessary to limit the amount of tricalcium aluminate formed.
The major raw material for the clinker-making is usually limestone mixed with a second material containing clay as source of alumino-silicate. Normally, an impure limestone which contains clay or silicon dioxide (SiO2) is used.
The calcium carbonate (CaCO3) content of these limestones can be as low as 80%. Second raw materials (materials in the rawmix other than limestone) depend on the purity of the limestone. Some of the second raw materials used are: clay, shale, sand, iron ore, bauxite, fly ash and slag. The clinker surface and its reactions in different electrolytic solutions are investigated by scanning electron microscope and atomic force microscopy.
Portland cement clinker is ground to a fine powder and used as the binder in many cement products. A little gypsum is sometimes added. It may also be combined with other active ingredients or chemical admixtures to produce other types of cement including: ground granulated blast furnace slag cement.
Clinker is a nodular material produced in the kilning stage during the production of cement and is used as the binder in many cement products. The lumps or nodules of clinker are usually of diameter 3-25 mm and dark grey in color. It is produced by heating limestone and clay to the point of liquefaction at about 1400 C-1500 C in the rotary kiln. Clinker, when added with gypsum (to control the setting properties of cement and ensure compressive strength) and ground finely, produces cement. Clinker can be stored for long periods of time in a dry condition without degradation of quality, hence it is traded internationally and used by cement manufacturers when raw materials are found to be scarce or unavailable.
Crown Portland Composite Cement is CEM-II/A-M which is a cement consisting of Clinker, Gypsum, Pulverized Fuel Ash (PFA), Blast Furnance Slag and Limestone designated by the specifications of BDS EN 197-1: 2003; CEM -II/A-M (V-S-L), 42.5 N. PCC is the most suitable cement for constructions in Bangladesh. CEM â?? II /A-M contains 80-94% Clinker, which is substantially higher than CEM â?? II/B-M containing 65 â?? 79% Clinker that provide us extra advantage in strength development and increase concrete performance.
Both slag & fly ash (PFA) are used in PCC. Percentage of SiO2 in PFA is higher than slag which is advantageous to gain more long-term strength and ensure durable concrete. This type of cement is used for large constructions all around the world and it has been used during the last few decades.
The hydration process of normal cement produces Calcium Silicate Hydrate CHS & Calcium Hydroxide Ca(OH)2. Calcium Hydroxide Ca(OH)2 does not contribute to gain strength and it is the weak part of reaction which is not suitable for concrete. Since PFA contains higher portion of reactive silica and slag contains alumina, it helps to convert Ca(OH)2 into CSH to gain further strength.
We are cement manufacture from Indonesia. We produces cement and clinker.
Clinker is a semi-finished material to make cement, if it is ground with gypsum and other minerals may be added.
Clinker forms in the form of lumps or nodules with a general size of 3 millimeters (0.12 in) to 25 millimeters (0.98 in) in diameter.
Specification : Clinker to manufacture cement as per EN 197-1 2011 strength class 42.5 N & ASTM (Attached)
Packing : Bulk
FOB : USD 49.00 / MT
Payment : 20% advance via TT and 80% irrevocable, unrestricted & confirmed Letter of Credit payable at sight in favor of the Seller from a first class international bank.
Quantity : 55,000 MT +/- 10% X 12 Months
Laycan : July 2022.
Loading Rate : 10,000 MT PWWD SHINC excluding super holidays
Vessel : Vessel should be Geared and with Grab of 10~12 CBM in case of ungeared vessel shore cranes and Grab will be use and the charges shall be borne by the buyer as per actual.
NOR : NOR to be tender by the master at load port after registering the vessel with the relevant port authority on working day during the office hours i.e. between 0900 hrs to 1700 hrs from Monday to Friday and B/w 0900 HRS to 1200 HRS on Saturday.
Laytime : Time to count after berthing of vessel.
Validity : Offer validity, 7 days from the date of this letter
Clinker export from Pakistan is a lucrative business. Pakistan is currently one of the leading clinker exporters, Clinker is defined as a material that occurs as lumps during the cement kiln stage. The primary use of this product is to manufacture cement. It is especially useful in the production of Portland cement. This kind of cement is manufactured from chalk and clay. These two materials harden underwater and begin to resemble the color of Portland stones. Portland cement clinker is added to the process of cement making to control the productâ??s setting properties. We provide high-quality clinker which will result in a topnotch final product.
For the time being, we can supply our cement clinker products to markets in China and the Philippines.
Our customers in these countries can benefit greatly due to exponentially growing demands and the ability to offer competitive prices on our products. Our load rate from Pakistan can be maintained up to 8,000 tons per day for bulk vessel and we are more than capable to supply up to 150,000 tons of clinker each month. If you're looking for reliable clinker suppliers, do get in touch with Shamima Trading!
We also offer clinker to the customers with their own grinding units. Clinker can be easily handled by ordinary mineral handling equipment and can be stored for several months without compromising on the quality. Clinker is the primary product in the cement manufacturing process where limestone, clay and sand are grinded and heated, before the gypsum is added to produce the final product of cement..
