How Do You Make Cement? Start with Clinkers

Last week I wrote about the use of the Atomizing Nozzles to create a fog for wet room curing of concrete samples poured during road construction.  This week, I had the opportunity to work with another customer about concrete, but this time it was regarding the the manufacturing process.  Invariably, I always learn something new , and for this interaction, it was the term ‘clinkers.’

Concrete is a composite material composed of coarse aggregate bonded together with a fluid cement that hardens over time.  The customer I was working with was a cement manufacturer.  Cement production is basically a 2 step process – 1) clinker is produced from raw materials and 2) cement is produced from cement clinker.

clinkers
Typical Cement Clinkers

To make the clinker (step one), several powder raw materials are fed into a rotary kiln.  The kiln is heated to very high temperatures, and when the materials are mixed and heated, new compounds are formed and hydraulic hardening occurs resulting in the formation of the clinker.

My customer needed a way to clean off the residual dust left on the transport belts, after the clinkers were transported to storage silos.  Due to the high temperatures in the area, we focused in on the EXAIR Type 303 Stainless Steel model of the Super Air Knife, as it can withstand temperatures up to 800°F.  The customer went with (3) of the Super Air Knife Kits, which include the Shim Set, Auto Drain Filter Separator, and Pressure Regulator w/ Gauge, for easiest installation with maximum functionality.

The Super Air Knife is a tried and true product for cleaning, drying, cooling and general blowoff for conveyors.  And with widths up to 108″ available, any size conveyor can be handled.

To make cement (step two), the clinker is ground into fine powder with other ingredients including gypsum (calcium sulphates) and possibly additional cementitious (such as blastfurnace slag, coal fly ash, natural pozzolanas, etc.) or inert materials (limestone). It is then stored or packaged and ready to be made into concrete.

To discuss your application and how an EXAIR Super Air Knife can benefit your process, feel free to contact EXAIR and myself or one of our other Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

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