How to Control Stone Powder Content in Manufactured Sand

During the production of manufactured sand, multiple crushing and sand-making processes inevitably generate stone powder. This stone powder is a byproduct of the manufacturing process. Simply substituting sand with stone powder is impractical due to its high impurity content, which directly compromises concrete quality. This naturally raises the question: How can stone powder content in manufactured sand be controlled?

Engineering standards specify radioactive limits for manufactured sand concrete. According to these standards, typical stone powder content limits are:

Class I Sand ≤5.0%

Class II Sand ≤7.0%

Class III Sand ≤10.0%

Manufactured Sand Type    Class I Sand    Class II Sand    Class III Sand

Stone Powder Content Standard    ≤5.0%    ≤7.0%    ≤10.0%

While appropriate stone powder can fill voids in manufactured sand, excessive amounts compromise the stability of construction materials. Therefore, equipment selection during production plays a critical role in the final product quality. Here are two primary methods for controlling stone powder content in manufactured sand:

1. Screening Process

After crushing by the crusher, the aggregate undergoes screening. Material larger than 5mm is transported to the next stage for reprocessing, while material smaller than 5mm is directly conveyed to the finished product silo. Dust generated during production and transportation can be recovered via dust collectors.

2. Mixing Chamber Production

Vertical shaft impact crushers can also be used for sand production. These crushers employ the stone-on-stone and stone-on-iron principles, effectively reducing material loss and offering extended service life.

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