Method for desulfurizing sodium sulfate subtype salt lake brine and enriching lithium

The invention discloses a method for desulfurizing sodium sulfate subtype salt lake brine and enriching lithium. The method comprises: 1, calculating a first desulfurization temperature according to aformula Y1 of 0.112X1+2.38; 2, cooling sodium sulfate subtype salt lake brine to the temperature of X1 DEG C, and carrying out solid-liquid separation at the temperature of X1 DEG C after the temperature is stabilized; 3, calculating the n-th desulfurization temperature according to a the formula Yn of 0.112Xn+2.38; 4, cooling the liquid phase after the (n-1)-th desulfurization to the temperatureof Xn DEG C, and carrying out solid-liquid separation at the temperature of Xn DEG C; and 5, when Yn is greater than the final target sulfate concentration, repeatedly performing the steps 3 and 4, wherein the product is the desulfurized lithium-rich brine when the Yn is less than or equal to the final target sulfate mass concentration. According to the present invention, with the method, the brine temperature and the sul