| 摘要 |
New process for the treatment of brines containing, per litre, 16 to 85 g of magnesium, 3 to 15 g of potassium, 43 to 10 g of sodium, 1 to 0.5 g of calcium, 15 to 55 g of sulphate, 108 to 237 g of chloride, 1.7 to 1.6 g of bromide and 0.15 to 0.54 g of carbonate, characterised in that the following operations are carried out successively: 1. Maximum removal of sodium chloride by evaporation of the brine; 2. Cooling of the resulting preconcentrated brine to a temperature of between 15 and -10 DEG C, so as to crystallise epsomite; 3. Precipitation of non-sulphated carnallite and isolation of this carnallite; 4. Aqueous decomposition of the carnallite obtained for the purpose of obtaining a precipitate composed of KCl, and 5. Subsequent reaction, by any known process, of the epsomite and the KCl thus obtained, so as to prepare pure potassium sulphate. <IMAGE>
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