SODIUM SULFATE

b) lixiviating the crushed ore in a first lixiviating step with water or an exhausted solution from a following or succeeding step, at a temperature between about 20° C. and 40° C., to obtain a suspension comprising a sodium sulfate saturated solution, sludges and insoluble material;... c) settling the sludges and insoluble material from the saturated solution of step b) to separate a clarified saturated solution;... d) crystallizing the clarified saturated solution of step c) in a first crystallization step, at a temperature between 32° C. and 20° C., while maintaining the height of the solution so it does not exceed about 15 centimeters, to obtain a Glauber salt which has crystals of sodium sulfate with ten molecules of water and an exhausted solution with the density of about 1.21 g/cc, wherein the exhausted solution is drained and recycled back to the first lixiviation step;