Dingwei equipment core device helps Zijin Mining Daoxian lithium mine project put into operation
Dec 17,2025
Recently, the integrated mining, beneficiation, and metallurgy project of Zijin Mining's Xiangyuan Lithium Polymetallic Mine, with a total investment of 13 billion yuan, was officially launched and put into operation in Dao County, Yongzhou, Hunan. As the core supplier of key process equipment for the project, Shijiazhuang Dingwei Chemical Equipment Engineering Co., Ltd. independently developed, designed, manufactured, and installed the Glauber's salt freeze crystallization device and lithium carbonate carbonization pyrolysis purification device, providing key technical support for the release of 30000 tons/year battery grade lithium carbonate production capacity.
1. Glauber's salt freeze crystallization device
Dingwei Equipment's customized manganese salt freeze crystallization system uses continuous freeze crystallization technology to efficiently separate sodium sulfate from lithium containing solutions in the form of decahydrate sodium sulfate (manganese salt), targeting the low-grade characteristics of Xiangyuan lithium ore. This device has three core advantages: firstly, precise and controllable crystallization temperature, which avoids crystallization defects caused by local temperature fluctuations through continuous operation in a vacuum environment; Secondly, the unique crystallizer structure design effectively prevents pipeline blockage and ensures continuous production needs; Thirdly, the lithium loss rate has been significantly reduced, and the purity of sodium sulfate has been greatly improved, laying a high-purity raw material foundation for the subsequent purification of lithium carbonate.
2. Carbonization pyrolysis purification device
The supporting lithium carbonate carbonization pyrolysis purification device is designed with multi-stage series carbonization towers and CO ₂ countercurrent operation, which improves the conversion rate of lithium carbonate and achieves CO ₂ recovery and recycling, significantly reducing production costs and carbon emissions; The pyrolysis unit adopts steam indirect heating technology to reduce scaling on the heat exchange surface, extend the equipment operation cycle, and ultimately increase the purity of lithium carbonate from 98.5% to above 99.95% of battery grade, perfectly meeting the high standard requirements of core raw materials for new energy batteries.
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