Pilot-scale test of lithium feldspar grinding and calcination

In order to explore the lithium extraction process of petalite, a series of grinding and calcination tests are planned to be carried out on the pilot test line of Zheng Mine Machine. The goal is to determine the effective lithium leaching conditions and provide detailed data support for the subsequent industrial production line design. This test will deal with more than 20 tons of lithium feldspar, involving multi-stage fine operation and parameter control.

Test Process overview
Raw material preparation: lithium content of about 1%-3% of the lithium permeable feldspar as the starting material, after preliminary crushing, to ensure that the size is suitable for subsequent processing.

Raw material grinding: use Φ0.9 × 2.1m ball mill system for closed-circuit grinding to produce fine powder that meets the requirements. At this stage, the characteristics of raw materials shall be considered and the particle size distribution shall be adjusted.

Calcination process: The Φ0.8m × 15m rotary kiln calcination system is used to promote the transformation of petalite to spodumene in the temperature range of 950-1100. The key is to accurately control the temperature and time to improve the activity and extractability of lithium element.

Cooling and clinker grinding: The calcined product is cooled by a Φ0.6m × 5m single-cylinder cooler, and then closed-circuit grinding through a Φ0.9 × 2.1m ball mill system to ensure that the material before leaching reaches the ideal fineness, while paying attention to dust management and energy efficiency.
Mixing process: Although not detailed in the original list, the mixing (using ZKZL15 type clean strong mixer) may be used for pre-treatment or post-treatment to improve the uniformity and reactivity of the material. Equipment and environmental considerations.
The pilot test of grinding and calcination of lithium feldspar is not only an in-depth exploration of the existing process, but also provides a valuable technical reference for the sustainable development and utilization of lithium resources. Through well-designed experiments, it can not only improve the leaching efficiency of lithium, but also lay a solid foundation for the construction of a more environmentally friendly and economical industrial production line. With the deepening of the test, it is expected that the process parameters will be further optimized to provide a more stable and effective supply of lithium raw materials for the new energy industry.