With the rapid development of China's highway, railway, real estate, water conservancy and other infrastructure construction, the demand for gravel aggregates surges greatly. The original natural gravel resources in terms of quantity and quality are unable to meet the needs of large-scale infrastructure projects, so it has become a general trend that fine artificial sand will replace the natural sand. At present, artificial sand production has become an ascendant industry. The market price of artificial sand is about 30-50 yuan / ton. Except the pre-site selection, equipment investment and wear parts consumption in the process of production, it basically needs no other funds. Guizhou is China's province with rich mining resources, so it has great advantage to develop large stone production lines. By grasping the market opportunity in the right time, the stone plant in Guiyang, Guizhou Province introduces a large gravel production line with hourly capacity of 1200t.

1. Process design: the 1200t/h gravel production line of Guiyang stone plant in Guizhou mainly adopts the combined crushing technique with two hammer crushers, PCZ1620, the latest product of Dingli. The closed-loop system formed not only increases the hourly capacity but also guarantees the crushing degree of the aggregates is within the required size range for the particles. In order to ensure the cleanliness of aggregates, the vibrating feeder with the function of soil removing is adopted in the feeding end, which is the first channel; in the back end, the finished materials in line with the application requirements are screened through the screening equipment with reasonable configuration, three in the front and two in the back. Compared with others, the process using the above equipment has the advantages of light installed capacity, convenient maintenance, less investment and quick effect, and the finished aggregate particles have good shape, high cleanliness and stone strength, etc.

2. Production & installation: it totally takes 2 months to complete the entire production line since Jun 19, 2011 when the contract was signed. The whole procedure includes the process design of entire production line, equipment manufacturing & installation and the final enabling of standard operating procedures.