Method for preparing high-purity calcium chloride by utilizing distilled ammonia waste liquid solar pond

• Main Authors: SHI CUNJIE, GUO ZUPENG, ZHANG XINGRU, TU LANYING, ZHAO QIWEN, LIN ZEZHONG
• Format: Patent
• Language: English
• Published: 17.06.2015
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a method for preparing high-purity calcium chloride by utilizing a distilled ammonia waste liquid solar pond and relates to the technical field of inorganic salt. The method particularly comprises the following preparation steps: Step 1: clarification, Step 2: evaporation, Step 3: separation, Step 4: evaporation, Step 5: solar pond construction, Step 6: horizontal layered pouring of the solar pond, Step 7: inner layer distribution control of the solar pond, Step 8: observation, Step 9: operation, Step 10: further evaporation and concentration, Step 11: crystallization and settling separation, and Step 12: further evaporation and concentration till dryness. The method has the benefits that soda distilled ammonia waste liquid is used for constructing the solar pond, many salt resources and water resources can be saved; collected solar energy is used for comprehensive utilization of the distilled ammonia waste liquid; the energy consumption in a recovery process of sodium chloride and calcium chloride is reduced; and the method is dual-purpose. The technology has the characteristics of low energy consumption and high purity of a calcium chloride product.