As a key raw material for national important construction projects, the choice of production process of sand and gravel aggregate is crucial to the quality of the product and the reliability of the production line. At present, the sand and gravel aggregate production process in China is mainly divided into three types: dry, wet and combined wet and dry. When choosing the appropriate production process, the following key factors should be considered.

First, pay attention to the geological exploration of the mother rock mine. The geological condition of the parent rock has an important influence on the selection of production process. Through in-depth geological exploration of the parent rock, understanding the type, distribution and nature of ore resources can provide basic data and basis for selecting suitable production process.

Secondly, it is combined with the resource situation of the project site. Including ore resources, water resources, land resources and climatic conditions, etc. Considering the availability of ore resources, water resources supply status and protection and governance, the production process that best suits the local conditions can be selected. For example, if water resources supply is limited or better protection of water resources is needed, preferring dry process is a reasonable choice.

Third, the selection is based on the downstream requirements for sand and gravel aggregate quality. The shape, mud content, firmness, stone dust content and clay lump content of sand and gravel aggregates have different requirements for different projects. According to the downstream construction or market demand, choosing the appropriate production process can ensure that the product can meet the requirements. For example, if the product has higher specific requirements for stone powder content and fineness modulus, a dry process or a combination of wet and dry process can be considered to obtain better product quality.

In the actual engineering design, the above factors need to be taken into consideration and selected according to the specific situation. In general, priority is given to the dry production process, followed by the combined wet and dry process, and finally the wet process. The dry process can reduce the use of water resources, reduce the impact on the environment, and improve the production efficiency and reduce costs when other conditions allow. The combined wet and dry process can overcome the influence of climate on production quality and efficiency under more complex geological conditions, and ensure the full utilization of resources. The wet process, on the other hand, is suitable for the production of products under specific requirements.

It should be noted that no matter which production process is used, the crushing, screening and shaping sand making equipment is basically the same, including feeders, coarse crushing equipment, medium crushing equipment, screening equipment, shaping sand making equipment, sieving equipment, and sand washing and fines separation equipment. Choosing the appropriate equipment and technology can improve the efficiency and product quality of the production line.

To sum up, when choosing sand and gravel aggregate production process, multiple factors such as project geology, resource situation, market requirements and environmental protection requirements should be considered. According to the nature of the ore and the characteristics of the water resource situation, choose the appropriate production process and process equipment to ensure the reliable performance of the production and processing system. Detailed discussion and consultation with professionals can lead to more specific and professional advice to make the best choice.