Zhoushan Island Group is located on the south of Yangtze River estuary and the east China sea beyond the Hangzhou Bay. It is the largest archipelago in China. Today, it is connected by a 48km Zhoushan bridge, as an important hub of China "21st century Maritime Silk Road." For speeding up the land development and infrastructure construction of Zhoushan free trade port, Zhejiang Communications Investment Group Co. LTD (CICO) has extended their business scope into the production field of mineral resources and transport building materials by investing and establishing Zhejiang Communication Resources Investment Co. LTD in 2015. This not only ensures raw material supply for the construction of Zhejiang roads and bridges, but also meets the market demand of sand and aggregate from Shanghai and its surrounding cities. Dayhuangshan tuff quarry (hereinafter referred to as "Dayhuangshan quarry") is the first aggregate mine constructed by CICO. It is located at the north end of Zhoushan Cezi Island, with a mining area of 10,481 square kilometers, resource reserves of 184 million tons and production life of 15 years.
At the beginning of construction, Dahuangshan quarry set the construction concept of "green development" and the production goal of "maximum resources efficiency.” In October 2019, the first phase project of Dahuangshan completed with a 5 million tons/year aggregate production line. Stable and efficient production equipment, advanced intelligent control system and lean management system have become the cornerstone of Dahuangshan quarry to ensure production. Even in the face of the subsequent difficulties caused by the epidemic and the continuous challenges brought by the production sprint, the Dahuangshan quarry kept forging ahead steadily to the goal of improving quality and production capability, reducing cost, increasing efficiency, saving energy and minimizing consumption. In 2020, the annual output reached nearly 14 million tons, and it is rated as National Green Mine with the highest score in Zhejiang Province.
Regarding these achievements, Yanquan Ma, manager of machinery and materials department of Dahuangshan Quarry, is one of the main managers of the core production equipment, and gave his own opinion: "The expertise and skill level of Metso Outotec engineers is excellent, and they are basically on call. They put forward professional suggestions, from the early stage of process planning and equipment selection, to associated equipment and technical upgrades, and made positive contributions to the success of our project."
Efficient and stable equipment for the high-quality aggregate
The aggregate production system of Dahuangshan Phase I project adopts three-stage and one closed-circuit process. The core crushing and screening equipment is provided by Metso Outotec, including 2 units of Superior® PG4265 primary gyratory crushers, 2 units of Nordberg® HP500 cone crushers and 4 units of HP400 cone crushers for secondary and tertiary crushing, and 4 units of Barmac® B9100SE VSI crusher for producing shaped products. The product is 0-5mm manufactured sands, 5-16mm and 16-26.5mm high-quality aggregates, 5-16mm and 16-31.5mm aggregates for commercial concrete.