重铬酸铵清洁生产新工艺

Abstract

Abstract: A new clean process for production of ammonium dichromate was developed by recrystallizing the low-temperature thermal decomposition products of sodium chromate（Na₂CrO₄） and ammonium dichromate from a double salt crystal， NaNH₄CrO₄·2H₂O obtained from the carbonation process of Na₂CrO₄ in ammonia solution.The solubility and phase diagram of Na₂CrO₄-（NH4）₂Cr₂O₇-H₂O system were determined.According to the solubility data and phase diagram，the recrystallizing separation process of thermal decomposition products to prepare ammonium dichromate was analyzed.Results showed that the high purity ammonium dichromate could be obtained by dissolving and cooling crystallizing the thermal decomposition pro- ducts at 100 ℃ and 50 ℃，respectively，and the yield of ammonium dichromate was 76.8%.Through ammonia still process，the mother solution could be reused，and the ammonia could be recycled in the process.Therefore，the process was cleaner and more environmentally friendly.

Key words: ammonium dichromate, clean process, solubility, phase diagram analysis

CLC Number:

TQ113.7

LIU Chang-Jian. New clean process for ammonium dichromate production[J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(5): 44-.

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Inorganic Acid-Base-Salt Committee of CIESC

New clean process for ammonium dichromate production

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