关键词: 碳酸钾, 离子交换, 解吸, 除氨

Abstract: The ammonia is removed by evaporation in the existing potassium carbonate production process.As the ammonia cannot be removed completely，heat transfer of evaporator is decreased when a lot of NH₃ and CO₂ in the secondary steam，and evaporation energy consumption is increased accordingly.On the other hand，it is difficult to collect the volatilized NH₃ and CO₂，resulting in waste of resources and the increasing of production cost.The desorption method，a new ammonia removal process was introduced and the influence factors，such as temperature of solution，air/liquid ratio，trickle density，air-stripping time，and initial concentration，were investigated.Results showed that quantitatively，the initial temperature of solution，air/liquid ratio，trickle density，and air-stripping time has the greater influence on ammonium bicarbonate′s decomposition， whereas the initial concentration does not.The optimum technological parameters were determined as follows：the initial temperature of the solution was 85 ℃，air/liquid volume ration was 30∶1，trickle density was 55 m³/(m²·h)，and air-stripping time was 2.5 h.Under the optimum conditions，the eliminated rate of ammonia was 95.48%.

Key words:  , potassium carbonate；ion exchange；desorption；ammonia removal