Method for preparing carnallite from waste salt and old brine

• Main Authors: YANG WENQING, CAO YIGUO
• Format: Patent
• Language: Chinese; English
• Published: 21.11.2023
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; FERTILISERS; FERTILISERS PRODUCING CARBON DIOXIDE; INORGANIC CHEMISTRY; INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; MANUFACTURE THEREOF; METALLURGY

The invention discloses a method for preparing carnallite by using waste salt and old brine. The method comprises the following steps: preparing the old brine and fresh water into dissolving washing liquor, controlling the Baume degree Be to be 24-25, adding the dissolving washing liquor into the waste salt, stirring, washing, naturally precipitating, evaporating, adding brine to adjust the Be to be 30.5-31.5, transferring to a carnallite pool, carrying out solarization evaporation, and separating out the carnallite. The potassium content of the carnallite prepared by the method is higher than 16%, and the quality of the carnallite meets the requirements of potash fertilizer production. 本发明公开了一种利用废盐和老卤水制备光卤石的方法，包括将老卤水与淡水配制成溶解洗液，波美度Be控制在24-25，加入到废盐中搅拌、洗涤，自然沉淀、蒸发，兑卤调节Be为30.5-31.5的矿卤水，移至光卤石池日晒蒸发，析出光卤石。该方法制备的光卤石含钾高于16％以上，质量满足钾肥生产的需求。