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Various types of mixing plants

September 25, 2013

There are many types of mixing plants but mostly they are involved in the production of certain building materials such as concrete or cement and asphalt. In this article we will examine the differences and similarities between each of these mixing plants.

Concrete mixing plant

A concrete mixing plant (which is also known as a batch plant) is a machine that merges the various ingredients used to make concrete. Most common ingredients of concrete are sand, water, gravel and cement. A mix can also include coal ash (flue-ash) and potash. There are two different types of plants that produce concrete – central mix and ready mix plants. Apart from the mixing part of these plants, they also possess aggregate batchers, radial stackers, cement batchers, aggregate bins, chillers, cement silos, cement bins, dust collectors (which reduces the plants carbon footprint and other environmental issues), batch plant controls and heaters. These plants utilise 3 different kinds of mixers: Pan, Tilt and Twin shaft.

Asphalt batch mixing plant

This is a plant that mixes and manufactures asphalt along with macadam (a type of road covering made from a mixture of asphalt and small stones), and other various kinds of coated road stones, also known occasionally together as blacktop. These mixtures are created by aggregating products such as sand, stone dust, bitumen or tar in certain quantities. These mixes result in a product that must be kept at a certain temperature (usually around 100-200 degree Celsius) so that it is malleable and ready for laying. Another optional ingredient for the concoction is recycled asphalt pavement which is quickly becoming more commonly used. There are 3 primary categories of this plant: semi-continuous (or asphalt plant), batch heater and drum mix.  The most productive one of these is the drum mix plant, having an average output of up to 500 tonnes per hour, but the lowest output comes from the batch heater plant.

Batch heater plants are usually used for short production stints as you can change the input after every batch and mobile batch heaters are available for onsite mixing.

Drum mix plants usually require a longer run as the input mix is added in greater quantities than those for the batch heater but this does provide the user with a bigger output. These plants are also more refined thus making controlling the mix more accurate which makes managing the output quantities and timing possible.

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