Three-in-one preparing technology for high-purity lithium carbonate

The invention relates to a three-in-one preparing technology for high-purity lithium carbonate. The three-in-one preparing technology mainly includes the following steps that lithium ore enters a kiln from a lithium ore warehouse through a pipe, and high-temperature calcination is completed; after calcination, a reactant is conveyed into a ball mill to be milled, and the milled reactant stays in the ball mill; raw bittern enters a reaction kettle and is heated through a high-temperature steaming furnace to be evaporated, then a sodium carbonate solution is introduced from an auxiliary material pool into the reaction kettle for reacting, and a reactant enters a filtering device to be filtered and then returned into the reaction kettle; the reactant in the ball mill is conveyed into the reaction kettle to be mixed with the reactant obtained in the corresponding step, sulfuric acid is introduced from a sulfuric acid pool for reacting, heating is carried out through the high-temperature steaming furnace in the reacting process, a clinker material is obtained, and water is pumped from a pool to complete leaching; sodium carbonate is added to complete a neutralization reaction, a reactant enters the filtering device to be filtered and then enters a centrifugal separator to be subjected to separation, and the lithium carbonate is obtained and finally dried.