Method for directly preparing lithium sulfate from hard rock type lithium ore

The invention provides a method for directly preparing lithium sulfate from hard rock type lithium ores, which comprises the following steps: uniformly mixing lithium ores with a roasting aid to obtain a mixture, the roasting aid comprising a sulfate aid; and roasting the obtained mixture in a muffle furnace to obtain a roasted material containing the lithium sulfate salt. According to the method, the hard rock type lithium ore is used as a raw material, the lithium ore and the roasting auxiliary agent are uniformly mixed and roasted, the lithium sulfate salt is directly produced, the technological process is simple, and meanwhile, a new thought is provided for utilization and development of the hard rock type lithium ore and preparation of the lithium sulfate salt. 本发明提供了一种硬岩型锂矿直接制备硫酸锂盐的方法，所述方法包括以下步骤：将锂矿与焙烧助剂混合均匀，得到混合料，所述焙烧助剂包括硫酸盐助剂；将得到的混合料置于马弗炉中焙烧，得到包含硫酸锂盐的焙烧料。本发明以硬岩型锂矿为原料，将锂矿和焙烧助剂混合均匀焙烧，直接生产硫酸锂盐，工艺流程简单，同时为硬岩型锂矿的利用开发和硫酸锂盐的制备提供了一条新思路。