Method for preparing lithium chloride and byproducts of lithium chloride from lepidolite

The invention relates to a method for preparing lithium chloride and byproducts of lithium chloride from lepidolite. The method specifically comprises the following steps: acidolysis digestion, vacuum defluorination, separation, cooling separation, iron and aluminum removal, neutralization, decoloration concentration, lithium deposition and chlorination. According to the method, lepidolite in Yichun tantalum-niobium tailings is utilized for preparing lithium chloride and the byproducts of lithium chloride, and different separation methods are selected according to the differences of physicochemical properties of different compounds by virtue of chemical engineering digestion thermodynamics methods and techniques. Compounds such as rubidium, caesium, potassium, aluminum, fluorine, calcium and silicon can be further obtained when the lithium chloride is prepared, so that the production cost for preparing lithium chloride from lepidolite is substantially lowered, and the resource utilization ...