Crusher Dust: Using the Wasted Rock Pieces

Crusher Dust: Using the Wasted Rock Pieces

Crusher dust or small pieces of waster rock is an extremely useful byproduct of quarrying procedures. Every day tonnes and tonnes of rock is quarried. Go to any mining site and you will see huge quantities of rocks getting crushed. In the process of crushing some part of the rocks gets waster in the form of small chip. This wastage is not only an additional burden on the environment but also wasted profit for the quarry management. The slag which is produced as a byproduct of quarrying and crushing procedures is collectively termed as Crusher Dust. Crusher dust is a natural byproduct of the quarrying process and is an additional revenue earning opportunity for the miners.

How it is manufactured

Crusher dust is produced by from the slag coming out of furnaces or regular crushing of rocks. It technically could be of any type of rock but most rocks used in construction are silicates or aliminosilicates. Limestone is major rock used in Brisbane and adjoining areas for construction material. The slag and rock pieces as a result of the mining process are generally of uneven shape. Generally the first separation is made basis size. Pieces greater than 5 mm are a larger variety of sand and are used as fillers. The smaller pieces are further grinded into crusher dust often around 1-2 mm in diameter. The bigger manufacturing plants often employ more sophisticated measures making the crusher dust even finer. They also add pre-coating or stabilizing agents before packing the crusher dust for selling.

Primary Uses

Crusher Dust is used as cement Aggregate primarily. It is also used as a filler to fill in cracks in pavements, patios or any other stone based path. Crusher dust is also used in conjunction with larger Aggregate material in the production of mortar. So it is also used as a paste bind various construction blocks together and fill the gaps between them. These blocks could be of any nature stone, brick, cinder blocks, etc. Modern mortars are typically made from a mixture of Crusher dust and a binder such as cement there by making crusher dust a very key ingredient.

A specific form Crusher dust is the manufactured sand which is an excellent alternative to natural sand. Manufactured sands can be blended with natural sands to provide improved water demand and concrete shrinkage values. And since most hardened properties of concrete like Strength, Shrinkage and Density are linked to mix water demand and so reduced water demand will provide excellent hardened properties.

Advantages: Technical, Economical and Environmental

Crusher dust retains most of the properties of the stone it originally was a part of. Most crusher dust materials are heat resistant and plastic free. They also have high strength and durability making them ideal for usage in construction. They are largely alkaline in nature and hence fairly stable in normal conditions. They also have good compression and tighten up on loosing water content.

Economically, proximity of sources to the premixed concrete plant lowers the transportation cost. The relative production cost of crusher dust is also low as compared to other options. Hence they provide a better alternative to natural sand.

Lastly they have a significant environmental advantage. Being a byproduct they are in fact minimizing the wastage from quarrying processes. Their proximity to actual construction site often means less transportation resulting in lower carbon emission. The fact they require less water is another significant environmental benefit.

Overall a Good Deal

It has to be acknowledged that Crusher dust still has a long way to go before completely replacing natural sand as a filling and Aggregate material as the coarse crusher dust often does not meet the strength specification for good grade aggregate material. But advancements in the processing technology will surely improve the quality in the future.

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