"The Qujing section of Chongqing-Kunming High-speed Railway innovatively adopts the EPC general contracting model, and the three-level crushing process + intelligent control system realizes the transformation of dolomite cave slag into treasure, and the wet process produces 4 types of graded aggregates, which solves the problem of limited site in mountainous areas and provides environmentally friendly and efficient sand and gravel solutions for high-speed railway construction."

The construction of the Qujing section of Chongqing-Kunming High-speed Railway tunnel slag treatment has become an important task. The project adopts the EPC general contracting model of Liming Group and China Railway 12th Bureau, realizing a full-process solution from production process to after-sales service.

Click here to consult about the construction plan of sand and gravel aggregate production line

Project Overview:

1. Raw material characteristics: mainly processing dolomite tunnel slag

2. Equipment configuration: feeder + jaw crusher + impact crusher + impact sand making machine + vibrating screen combination

3. Finished product specifications: 0-5mm, 5-10mm, 10-20mm, 16.5-31.5mm four gradations

4. Process characteristics: adopt wet production process

5. Product use: mainly used as raw materials for concrete mixing stations required for high-speed rail construction

Project advantages: Facing challenges such as limited mountain terrain and compact site, the project team has demonstrated strong engineering strength:

1. Innovative process design adopts a three-stage crushing process flow, combined with an efficient screening system, to achieve simultaneous production of multiple levels of finished products. The primary crushing uses a heavy jaw crusher to ensure reliable crushing of large stones, and the secondary crushing uses an impact crusher for medium crushing, and finally the impact crusher completes the shaping and sand making.

2. Intelligent control system The entire production line is equipped with an advanced control system to achieve automatic adjustment of feeding speed, crushing parameters, and screening efficiency, ensuring stable and controllable quality of finished products.

3. Environmentally friendly production plan The wet production process is combined with a dedicated water treatment system to effectively control dust emissions and achieve clean production. The production line is equipped with complete wastewater recycling facilities.

4. General contractor advantages The project adopts the EPC engineering general contracting model, which is fully responsible by a professional project manager. This model shows the characteristics of flexible scheduling and controllable progress in complex mountain construction, and solves problems such as limited equipment transportation and installation space.

Relying on its technical accumulation in the field of mining machinery, Liming Group provides reliable equipment support for the project. The core equipment of the production line includes:

Heavy jaw crusher: processing large pieces of raw materials

Multi-cavity impact crusher: efficient secondary crushing

VSI impact sand making machine: fine shaping

Multi-layer vibrating screen: precise classification

After the completion of the project, it not only solves the problem of tunnel slag treatment, but also provides high-quality sand and gravel aggregates for high-speed rail construction, realizing efficient recycling of resources. This provides an engineering example that can be used as a reference for the production of sand and gravel aggregates in infrastructure construction in mountainous areas.