The extraction of lithium from lepidolite is a vital process in lithium resource development, with the Sulfate Roasting Method being the most established and widely adopted core technology. This process converts lithium in lepidolite into a soluble form through high-temperature roasting, followed by leaching, purification, and precipitation to produce final lithium carbonate products. The detailed process flow is as follows:
1. Mixing and Roasting: Lepidolite concentrate is mixed with sulfate salts like potassium sulfate and sodium sulfate in specific proportions. The mixture is then fed into a rotary kiln and roasted at high temperatures of 850-950°C. This critical step breaks down the lepidolite structure, transforming the lithium into soluble lithium sulfate.
2. Water Leaching and Filtration: The roasted clinker undergoes water leaching, dissolving the lithium sulfate into the solution. Solid-liquid separation then yields a lithium-bearing solution.
3. Multi-Stage Purification: The initial lithium solution contains impurities such as aluminum, calcium, and magnesium. Through a multi-stage purification process including impurity removal, aluminum precipitation, and calcium/magnesium removal, a high-purity lithium solution is obtained.
4. Precipitation and Post-Treatment: Sodium carbonate is added to the purified lithium solution to precipitate lithium carbonate. The resulting
product is then washed and dried to achieve industrial-grade or battery-grade lithium carbonate.
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