二氧化碳回收电解锰废水中镁的研究
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摘要
探究了锰矿酸浸工段产生的废气中CO2回收脱锰后电解锰废水中Mg~(2+)、Ca~(2+)、NH4+-N可行性,确定了CO2回收废水中Mg~(2+)、Ca~(2+)、NH4+-N最佳工艺条件及其作用机理。结果表明,在反应时间240min、反应温度45℃、pH=9.2、二氧化碳体积浓度15%、搅拌速率600r/min的条件下,初始Mg~(2+)、Ca~(2+)、NH4+-N浓度为1 200、560、875mg/L废水中各元素回收率分别可达97.58%、99.68%、80.71%;回收Mg~(2+)反应符合一级动力学方程,其表观活化能为61.40kJ/mol,主要受扩散过程控制;废水中Mg~(2+)、Ca~(2+)主要通过形成Mg(OH)2·MgCO3沉淀被回收,其中NH4+-N则主要通过吸附在新生成沉淀晶体表面得以去除。
The feasibility to recover Mg~(2+),Ca~(2+)and NH4+-N in electrolytic manganese wastewater by CO2 from exhaust gas generated from manganese ore acid leaching section was investigated.The optimum process conditions and mechanism to recover Mg~(2+),Ca~(2+)and NH4+-N in wastewater by CO2 were determined.The results show that recovery of Mg~(2+)is 97.58% with initial concentration of Mg~(2+)in wastewater of 1 200 mg/L,recovery of Ca~(2+)is 99.68% with initial concentration of Ca~(2+)in wastewater of560 mg/L,and recovery of NH4+-N is 80.71% with initial concentration of NH4+-N in wastewater of 875 mg/L under the conditions including reaction time of 240 min,reaction temperature of 45℃,pH value of9.2,carbon dioxide volume concentration of 15%,and stirring rate of 600 r/min.Recovery of Mg~(2+)is mainly controlled by diffusion process and is in accordance with first-order kinetic equation with apparent activation energy of 61.40 kJ/mol.Mg~(2+)and Ca~(2+)in wastewater is mainly recovered by formation of Mg(OH)2·MgCO3 precipitate,and NH4+-N is mainly removed by adsorption on surface of newly formed precipitated crystal.
The feasibility to recover Mg~(2+),Ca~(2+)and NH4+-N in electrolytic manganese wastewater by CO2 from exhaust gas generated from manganese ore acid leaching section was investigated.The optimum process conditions and mechanism to recover Mg~(2+),Ca~(2+)and NH4+-N in wastewater by CO2 were determined.The results show that recovery of Mg~(2+)is 97.58% with initial concentration of Mg~(2+)in wastewater of 1 200 mg/L,recovery of Ca~(2+)is 99.68% with initial concentration of Ca~(2+)in wastewater of560 mg/L,and recovery of NH4+-N is 80.71% with initial concentration of NH4+-N in wastewater of 875 mg/L under the conditions including reaction time of 240 min,reaction temperature of 45℃,pH value of9.2,carbon dioxide volume concentration of 15%,and stirring rate of 600 r/min.Recovery of Mg~(2+)is mainly controlled by diffusion process and is in accordance with first-order kinetic equation with apparent activation energy of 61.40 kJ/mol.Mg~(2+)and Ca~(2+)in wastewater is mainly recovered by formation of Mg(OH)2·MgCO3 precipitate,and NH4+-N is mainly removed by adsorption on surface of newly formed precipitated crystal.
引文
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[4]TANSEL B,LUNN G,MONJE O.Struvite formation and decomposition characteristics for ammonia and phosphorus recovery:A review of magnesium-ammoniaphosphate interactions[J].Chemosphere,2018,194:504-514.
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[9]SHU J,LIU R,LIU Z,et al.Enhanced extraction of manganese from electrolytic manganese residue by electrochemical[J]. JournalofElectroanalytical Chemistry,2016,780:32-37.
[10]熊雪良.电解金属锰硫酸盐体系除镁技术研究进展[J].中国锰业,2016,34(1):5-8.
[11]刘洪刚,朱国才.氟化锰沉淀脱除还原氧化锰矿浸出液中钙镁[J].矿冶,2007,16(4):25-28.
[12]梁腾宇,杨超,阳海棠.电解金属锰生产过程除镁的研究[J].有色金属(冶炼部分),2014(6):13-16.
[13]GUIMARES A S,MANSUR M B.Selection of a synergistic solvent extraction system to remove calcium and magnesium from concentrated nickel sulfate solutions[J].Hydrometallurgy,2018,175:250-256.
[14]PADHY S K,TRIPATHY B C,ALFANTAZI A.Effect of sodium alkyl sulfates on electrodeposition of manganese metal from sulfate solutions in the presence of sodium metabisulphite[J].Hydrometallurgy,2018,177:227-236.
[15]LIU W,SU S,XU K,et al.CO2sequestration by direct gas-solid carbonation of fly ash with steam addition[J].Journal of Cleaner Production,2018,178:98-107.
[16]YETILMEZSOY K,ILHAN F,KOCAK E,et al.Feasibility of struvite recovery process for fertilizer industry:A study of financial and economic analysis[J].Journal of Cleaner Production,2017,152:88-102.
[17]王恩雷,张文军.利用淡化海水浓液制备碳酸镁晶须[J].辽宁工程技术大学学报,2011,30(6):909-912.
[18]赵斌,马雪晴,白艳,等.硫酸镁与碳酸钠反应制备碱式碳酸镁的研究[J].无机盐工业,2017,49(9):23-27.
[19]宋兴福,杨晨,汪瑾,等.碳酸氢钠调控五水碳酸镁的合成[J].化工学报,2015,66(1):164-170.
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