氯化铵和硝酸铵混合添加对硫酸铵结晶影响  

Effect of Ammonium Chloride and Ammonium Nitrate on Crystallization of Ammonium Sulfate

作　　者：顾杉 李军 詹炜 毛翔 江奇正 朱云兵 高迎峰 黄帮福[2] 自高勇 肖兰 GU Shan;LI Jun;ZHAN Wei;MAO Xiang;JIANG Qizheng;ZHU Yunbing;GAO Yingfeng;HUANG Bangfu;ZI Gaoyong;XIAO Lan(Yunnan Tianlang Energy Saving&Environmental Protection Group Co.,Ltd.,Kunming 650302,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南天朗节能环保集团有限公司,云南昆明650302 [2]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《昆明冶金高等专科学校学报》2023年第4期63-69,共7页Journal of Kunming Metallurgy College

基　　金：国家自然科学基金项目:Ir掺杂Fe-Mn/Ac催化剂低温CO+NH_(3)耦合脱硝机理研究(52264043);云南省应用基础研究计划面上项目:SO_(2)对MnOx-CeO_(2)/Ac脱硝催化剂毒化机理研究(202001AT070029)。

摘　　要：为探明混合添加不同比例氯化铵和硝酸铵对硫酸铵溶解度、介稳区和结晶的影响,采用激光方法测量了混合溶液溶解度及其介稳区,使用范特霍夫方程计算了混合溶液热力学,对混合溶液进行冷却结晶,采用筛分法探究晶体平均粒径大小和分布,使用微距对晶体形貌进行分析。研究表明:NH+4使硫酸铵水解反应逆向进行,导致混合溶液溶解度较纯水明显降低;Cl^(-)和NO_(3)^(-)也会影响硫酸铵溶解度,且Cl^(-)影响更明显。当氯化铵和硝酸铵比例为1∶2时,硫酸铵介稳区宽度变宽,说明硝酸铵能在一定程度上抑制硫酸铵成核;当氯化铵和硝酸铵比例为2∶1时,硫酸铵介稳区宽度较纯硫酸铵介稳区宽度变窄。无论氯化铵和硝酸铵比例如何调整,硫酸铵结晶量均有所上升。当氯化铵和硝酸铵比例为1∶1时,结晶量为最大且平均粒径也最大。相关研究成果可为优化臭氧脱硝联和氨法脱硫获得的高氯硫酸铵母液结晶提供新思路。In order to investigate the effects of adding different proportions of ammonium chloride and ammonium nitrate on the solubility,metastable zone and crystallization of ammonium sulfate,the solubility and metastable zone of the mixed solution were measured by laser method.The solution was cooled and crystallized.The thermodynamics of mixed solution is calculated by using Van t Hoff equation.The mixed solution was cooled and crystallized.The average particle size and distribution of the crystals were investigated by sieving method,and the crystal morphology was analyzed by macro.The results show that NH+4 can reverse the hydrolysis of ammonium sulfate,resulting in a significant decrease in solubility of the mixed solution compared with that in pure water;Cl^(-)and NO_(3)^(-)also affect the solubility of ammonium sulfate,and Cl^(-)has a more obvious effect.When the ratio of ammonium chloride to ammonium nitrate was 1∶2,the width of ammonium sulfate metastable zone became wider,indicating that ammonium nitrate could inhibit ammonium sulfate nucleation to a certain extent.When the ratio of ammonium chloride to ammonium nitrate was 2∶1,the metastable zone width of ammonium sulfate was narrower than that of pure ammonium sulfate.No matter how the proportion of ammonium chloride and ammonium nitrate was adjusted,the crystallization amount of ammonium sulfate increased.When the ratio of ammonium chloride to ammonium nitrate was 1∶1,the crystallization capacity and average particle size were the largest.The related research results can provide a new idea for optimizing the crystallization of ammonium sulphate mother liquor obtained by ozone denitrification and ammonia desulfurization.

关 键 词：氯化铵 硝酸铵 硫酸铵 溶解度 介稳区 结晶影响 

分 类 号：X511[环境科学与工程—环境工程]