Evaporation and concentration device and evaporation and concentration method for recovering sodium carbonate in salt lake lithium extraction

The evaporation and concentration device comprises a box body and a first rotating shaft, the surface of the first rotating shaft is fixedly connected with a supporting plate, the bottom of the box body fixedly communicates with a discharging pipe, a stirring component is arranged on the surface of the supporting plate, and the stirring component comprises a reciprocating defoaming assembly. And the reciprocating defoaming assembly is connected with the second rotating shaft and used for driving the second rotating shaft to vertically move, and the hot gas recycling part is arranged on the surface of the box body, comprises a heat preservation box and is connected with the second rotating shaft. The heating uniformity of sodium carbonate brine is improved, the evaporation and concentration speed is increased, steam generated during evaporation is conveyed to the heat preservation box through the hot gas recycling part, heat preservation is conducted on the box body, heat energy of the steam ...