基于表面更新的废铅膏脱硫实验
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摘要
铅酸电池的回收是铅酸蓄电池行业的一个重要部分,并且绿色技术与低能耗和污染物排放是迫切需求的。目前,传统工艺铅膏预脱硫率无法稳定达标,致使低温熔炼无法进行。为了解决问题,本文提出铅膏预脱硫"表面更新"模式,添加粒子作为研磨介质,反应浆液与粒子在反应器内高速旋转,对反应颗粒进行研磨,即时破坏产物碳酸铅包裹层,实现反应颗粒表面更新。由此构建了实验系统,研究了碳酸钠在表面更新实验系统中的铅膏脱硫性能。实验表明,在转速60r/min、温度50℃、浆液浓度30%~60%、摩尔比n(Na_2CO_3)∶n(Pb SO_4)=1.1∶1条件下,反应40min,铅膏含硫率<0.3%。
Recycling of the lead-acid battery is an important section for lead-acid battery industry,and green technologies with low energy consumption and pollutants emission are in urgent demand. At present,the traditional process of paste pre-desulfurization rate is unstable and standard,resulting in low temperature melting cannot be carried out. To solve the problem,this paper presents a new pre-desulphurization process of the damped lead paste based on "Surface Update" mode "Surface update" mode is to add particles as grinding media,which grinds reaction particles in the reactor in high speed rotation and instantly damage the product of the lead carbonate layer in order to achieve the surface of the reaction particles update. Thus,we constructed the experiment system and studied the desulfurization performance of the sodium carbonate. Results showed that the process can maintain the sulfur content of lead paste under 0.3% at the optimum reaction conditions,i.e.,stirring rate 60r/min,temperature 50℃,the slurry concentration 30%—60%,the molar ratio n(Na_2CO_3)∶n(Pb SO_4)=1.1∶1,and reaction time 40 min.
Recycling of the lead-acid battery is an important section for lead-acid battery industry,and green technologies with low energy consumption and pollutants emission are in urgent demand. At present,the traditional process of paste pre-desulfurization rate is unstable and standard,resulting in low temperature melting cannot be carried out. To solve the problem,this paper presents a new pre-desulphurization process of the damped lead paste based on "Surface Update" mode "Surface update" mode is to add particles as grinding media,which grinds reaction particles in the reactor in high speed rotation and instantly damage the product of the lead carbonate layer in order to achieve the surface of the reaction particles update. Thus,we constructed the experiment system and studied the desulfurization performance of the sodium carbonate. Results showed that the process can maintain the sulfur content of lead paste under 0.3% at the optimum reaction conditions,i.e.,stirring rate 60r/min,temperature 50℃,the slurry concentration 30%—60%,the molar ratio n(Na_2CO_3)∶n(Pb SO_4)=1.1∶1,and reaction time 40 min.
引文
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[12]ZHU X F,HE X,YANG JK,et al.Leaching of spent lead acid battery paste components by sodium citrate and acetic acid[J].Journal of Hazardous Materials,2013,250/251(8):387-396.
[2]潘军青,边亚茹.铅蓄电池回收铅技术的发展现状[J].北京化工大学学报(自然科学版),2014,41(3):1-14.
[3]Cosma S.COBAT:collection and recycling spent lead/acid batteries in Italy[J].Journal of Power Sources,1995,57:75-80.
[4]Prengaman R D.Recovering lead from batteries[J].Journal of Metals,1995,47(1):31-33.
[5]ZHU Xinfeng,LI LEI,SUN Xiaojuan,et al.Preparation of basic lead oxide from spent leadacid battery paste via chemical conversion[J].Hydrometallurgy,2012,117/118:24-31.
[6]汪振忠,柯昌美,王茜.废铅酸蓄电池铅膏脱硫工艺的研究进展[J].无机盐工业,2013,45(1):60-62.
[7]刘辉,银星宇,覃文庆,等.铅膏碳酸盐化转化过程的研究[J].湿法冶金,2005,24(3):146-149.
[8]丁希楼,谢伟.铅膏硫酸盐转化为碳酸盐的实验研究[J].安徽化工,2011,37(4):41-46.
[9]顾怡卿,刘晓荣,梁晓蓉,等.铅膏碳酸化脱硫转化工艺研究[J].上海应用技术学院学报,2008,8(3):169-173.
[10]YANAKIEVA V P,HARALAMPIEV G A,LYAKOV N K.Desulphurization of the damped lead battery paste with potassium carbonate[J].Journal of Power Sources,2000,85(1):178-180.
[11]俞小花,杨大锦,谢刚,等.含硫酸铅物料的碳酸盐转化试验研究[J].中国稀土学报,2010,28(专辑):457-460.
[12]ZHU X F,HE X,YANG JK,et al.Leaching of spent lead acid battery paste components by sodium citrate and acetic acid[J].Journal of Hazardous Materials,2013,250/251(8):387-396.