抄録
Na2CO, NaHCO3and their mixture, which were added to the carnallite solution, converted MgCl2into MgCO3·3H2O, and from this solution the Engel salt was deposited by carbonatation. The most suitable amount of the salts for the precipitation of the Engel salt was investigated. To get the product of good quality, the suitable amounts Na2CO3and NaHCO3were 1.5-1.2 times equivalents of the content of MgCl2in the carnallite, but their yields were 70%-50%. When NaHCO3was used, the carbonatation process was not needed for the precipitation of Engel salt, but the yields ware very bad (below 50%). The mixture of Na2CO3and NaHCO3could get the best results in the purity of the product and the yield of potassium.
