Abstract
Airflow classification is the key technology for the dry separation of manufactured sand. To solve the problem of low separation accuracy and poor gradation grade, the classification process of manufactured sand under different inlet and outlet airflow velocities changes in the multi-air inlet classifier is simulated by using Barracuda based on Computational Particle Fluid Dynamics (CPFD) method. The influence of various airflow velocity in air inlets and outlet on the sand classification is analyzed. The optimal combination of airflow velocity that meets the design goals is obtained. The results show that the airflow velocity and location of the air inlet and outlet have a significant impact on medium-grained (0.15~1.18 mm) and fine-grained (0.075~0.3 mm) sand. Adjusting the airflow velocity at air inlet 2 and air outlet can most effectively change the overall sand separation effect, while 41 m/s (inlet 2) and 6 m/s (outlet) would be the best velocity combination.
Highlights
As a short-term non-renewable construction aggregate, natural sand has been nearly exhausted after decades of high-intensity mining
Since the air inlet 5 is located on the upper side of the sand outlet 3, it can only affect the distribution of 0–0.6 mm sand and a minor portion of 0.6–1.18 mm sand
According to the sand distribution, the classification ability of the multi-air inlet structure is improved compared with the traditional single air inlet structure, and the sand can be subdivided according to the particle size grade
Summary
As a short-term non-renewable construction aggregate, natural sand has been nearly exhausted after decades of high-intensity mining. In the manufactured sand production process, classification is an essential basic operation It separates the crushed sand into multiple components with different particle size distributions. Both wet and dry state classification are widely used in industry. Compared with the wet process, the dry process is less affected by water source, climate, and temperature, and can save water resources [5]. It can install stone powder recovery equipment at the air flow outlet to help decrease pollution. The gravity air classifier is a core equipment of the manufactured sand making process, and its classification ability will directly affect the quality and output of the aggregate
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