Abstract:Taking lepidolite as raw material and potassium pyrosulfate as modifier, the influences of various factors on the modification effect of lepidolite and its modification mechanism were studied. The results show that when the mass ratio of potassium pyrosulfate to leucite is 1:1, the calcination temperature is 900 ℃ and the holding time is 90 min, the stable lithium in lepidolite ore can be converted to leachable lithium sulfate, and the extraction rate of lithium can reach more than 95.57%. At the same time, the process of lithium roasting modification mechanism is inferred as follows: With the increase of temperature, K2S2O7 first undergoes dehydration reaction, followed by decomposition reaction, releasing adsorbed active gas microparticles such as SO2 and SO3. These active gas microparticles are first adsorbed on the surface of lepidolite particles, and under the traction of opposite electron clouds lithium ion in the crystal structure, S—Li—O chemical bonds are formed and crystallize into sulfate structure.