含砷矿石细菌氧化液除砷实验及砷钙渣稳定性研究
|
摘要
以甘肃某金矿经细菌氧化提金后产生的高砷、高铁强酸性细菌氧化液为研究对象,并选择CaO作为沉淀剂进行中和除砷实验,考察pH值、温度、搅拌速度和反应时间等对中和除砷的影响,通过单因素实验确定最佳除砷条件,并探究在模拟自然环境下各因素对砷钙渣稳定性的影响。除砷实验结果表明:在pH=4~5、搅拌速度适宜及常温下反应25 min时,除砷率可达99.99%,实现了废水净化;砷钙渣定量分析结果表明:渣中As、Fe质量分数分别为4.04%和19.79%;模拟自然环境下砷钙渣稳定性影响实验结果表明:当环境pH≤1时,砷钙渣中的砷被溶出了5 mg/L,超过工业废水排放标准。通过试验发现,选择CaO作为沉淀剂对细菌氧化液进行中和除砷,可以实现废水净化,并且当含砷渣所处环境pH≥1时可以稳定存放。
Taking strong acid bacterial oxidation liquid with high arsenic and high iron produced by the bacterial oxidation gold extraction of one gold mine in Gansu Province as the research object,and selecting calcium oxide as precipitant to carry out the experiment of neutralization and arsenic removal.Through investigated the effect of the parameters such as pH value,temperature,stirring speed and reaction time on neutralization and arsenic removal,the best arsenic removal conditions were determined by single factor test. The influence of arsenic and calcium residue stability in simulated natural environment was explored. The results of arsenic removal test showed that the arsenic removal ratio was 99.99% under the optimal condition:pH=4~5,suitable stirring speed,reaction for 25 min at normal temperature and achieved the purification of waste liquid. The results of quantitative analysis of arsenic and calcium residue showed that the content of As and Fe in residue were 4.04% and 19.79% respectively.The experimental results on the stability of arsenic and calcium residue in simulated natural environment showed that:when the pH value was lower than 1,the arsenic in residue was dissolved out of 5 mg/L,exceeding emission standards of industrial waste.According to the results,it is possible to purify the wastewater by neutralizing arsenic with calcium oxide as precipitant,and the arsenic containing could be stored when the environmental pH≥1.
Taking strong acid bacterial oxidation liquid with high arsenic and high iron produced by the bacterial oxidation gold extraction of one gold mine in Gansu Province as the research object,and selecting calcium oxide as precipitant to carry out the experiment of neutralization and arsenic removal.Through investigated the effect of the parameters such as pH value,temperature,stirring speed and reaction time on neutralization and arsenic removal,the best arsenic removal conditions were determined by single factor test. The influence of arsenic and calcium residue stability in simulated natural environment was explored. The results of arsenic removal test showed that the arsenic removal ratio was 99.99% under the optimal condition:pH=4~5,suitable stirring speed,reaction for 25 min at normal temperature and achieved the purification of waste liquid. The results of quantitative analysis of arsenic and calcium residue showed that the content of As and Fe in residue were 4.04% and 19.79% respectively.The experimental results on the stability of arsenic and calcium residue in simulated natural environment showed that:when the pH value was lower than 1,the arsenic in residue was dissolved out of 5 mg/L,exceeding emission standards of industrial waste.According to the results,it is possible to purify the wastewater by neutralizing arsenic with calcium oxide as precipitant,and the arsenic containing could be stored when the environmental pH≥1.
引文
[1]田晓娟,杜德平,彭立娥,等.金矿的细菌浸出处理研究[J].中国地质,2008,35(3):557-563.Tian Xiaojuan,Du Deping,Peng Li’e,et al.Bacterial leaching of refractory gold ore[J].Geology in China,2008,35(3):557-563.
[2]周爱东,杨红晓.金的生物冶金发展[J].有色矿冶,2005,21(3):25-27.Zhou Aidong,Yang Hongxiao.Controlindustrial fluorine&accelerate sustainable development[J].Non-ferrous Mining and Metallurgy,2005,21(3):27-29.
[3]李育林.含砷细菌氧化浸出液氢氧化钙中和脱砷试验研究[J].湿法冶金,2006,25(2):100-102.Li Yulin.Removal of arsenic from bacteria oxidation lixivum by neutralization with calcium hydroxide[J].Hydrometallurgy of China,2006,25(2):100-102.
[4]Randall P M.Arsenic encapsulation using Portland cement with ferrous sulfate/lime and Terra-Bond?technologies-Microcharacterization and leaching studies[J].Science of the Total Environment,2012,420:300.
[5]张硕.难浸金矿细菌氧化-提金废水净化试验研究[D].沈阳:东北大学,2010.Zhang Shuo.Bacterial Oxidation of Refractory Gold Ore and Purification of Gold Extraction[D].Shenyang:Northeastern University,2010.
[6]柯平超,刘志宏,刘智勇,等.固砷矿物臭葱石组成与结构及其浸出稳定性研究现状[J].化工学报,2016,67(11):4533-4540.Ke Pingchao,Liu Zhihong,Liu Zhiyong,et al.Research status on composition,structure,and leaching stability of an arsenic solidification mineral scorodite[J].CIESCJournal,2016,67(11):4533-4540.
[7]Dove P M,Rimstidt J D.Solubility and stability of scorodite,Fe As O4·2H2O:reply[J].American Mineralogist,1987(72):845-848.
[8]Fujita T,Taguchi R,Abumiya M,et al.Novel atmospheric scorodite synthesis by oxidation of ferrous sulfate solution.Part II.Effect of temperature and air[J].Hydrometallurgy,2008,90(2/3/4):85-91.
[9]贾海,唐新村,刘洁,等.高砷废水处理及含砷废渣稳定化的试验研究[J].安全与环境工程,2013,20(3):53-57.Jia Hai,Tang Xincun,Liu Jie,et al.Experimental study on the stabilization of arsenic-containing waste residue and the treatment of high-arsenic wastewater[J].Safety and Environmental Engineering,2013,20(3):53-57.
[10]Manning BA,Fendorf S E,Bostick B,et al.Arsenic(Ⅲ)oxidation and arsenic(Ⅴ)adsorption reactions on synthetic birnessite[J].Environmental Science&Technology,2002,36(5):976-981.
[11]Tournassat C,Charlet L,Bosbach D,et al.Arsenic(Ⅲ)oxidation by birnessite and precipitation of manganese(Ⅱ)arsenate[J].Environmental Science&Technology,2002,36(3):493-500.
[12]谭春梅.砷的管理和稳定化[J].中国有色冶金,2017,46(2):1-6.Tan Chunmei.Arsenic management and stabilization[J].China Nonferrous Metallurgy,2017,46(2):1-6.
[13]崔日成,杨洪英,富瑶,等.不同含砷类型金矿的细菌氧化-氰化浸出[J].中国有色金属学报,2011,21(3):694-699.Cui Richeng,Yang Hongying,Fu Yao,et al.Biooxidation-cyanidation leaching of gold concentrates with different arsenic types[J].The Chinese Journal of Nonferrous Metals,2011,21(3):694-699.
[14]黄宝贵.高含量砷(Ⅲ)与砷(Ⅴ)的萃取分离法研究[J].冶金分析,1995,15(4):7-11.Huang Baogui.Investigation on the method of extractionseparation for high contents of As(Ⅲ)and As(Ⅴ)[J].Metallurgical Analysis,1995,15(4):7-11.
[15]钟正美.快速碘量法测定微量砷[J].铀矿冶,1986(3):67-69.Zhong Zhengmei.Determination of trace arsenic by rapid iodometric method[J].Uranium Mining and Metallurgy,1986(3):67-69.
[16]杨中超,朱利军,刘锐平,等.强酸性高浓度含砷废水处理方法与经济性评价[J].环境工程学报,2014,8(6):2205-2210.Yang Zhongchao,Zhu Lijun,Liu Ruiping,et al.Economic evaluation on technologies for treatment of stronglyacidic wastewater with high arsenic concentrations[J].Chinese Journal of Environmental Engineering,2014,8(6):2205-2210.
[2]周爱东,杨红晓.金的生物冶金发展[J].有色矿冶,2005,21(3):25-27.Zhou Aidong,Yang Hongxiao.Controlindustrial fluorine&accelerate sustainable development[J].Non-ferrous Mining and Metallurgy,2005,21(3):27-29.
[3]李育林.含砷细菌氧化浸出液氢氧化钙中和脱砷试验研究[J].湿法冶金,2006,25(2):100-102.Li Yulin.Removal of arsenic from bacteria oxidation lixivum by neutralization with calcium hydroxide[J].Hydrometallurgy of China,2006,25(2):100-102.
[4]Randall P M.Arsenic encapsulation using Portland cement with ferrous sulfate/lime and Terra-Bond?technologies-Microcharacterization and leaching studies[J].Science of the Total Environment,2012,420:300.
[5]张硕.难浸金矿细菌氧化-提金废水净化试验研究[D].沈阳:东北大学,2010.Zhang Shuo.Bacterial Oxidation of Refractory Gold Ore and Purification of Gold Extraction[D].Shenyang:Northeastern University,2010.
[6]柯平超,刘志宏,刘智勇,等.固砷矿物臭葱石组成与结构及其浸出稳定性研究现状[J].化工学报,2016,67(11):4533-4540.Ke Pingchao,Liu Zhihong,Liu Zhiyong,et al.Research status on composition,structure,and leaching stability of an arsenic solidification mineral scorodite[J].CIESCJournal,2016,67(11):4533-4540.
[7]Dove P M,Rimstidt J D.Solubility and stability of scorodite,Fe As O4·2H2O:reply[J].American Mineralogist,1987(72):845-848.
[8]Fujita T,Taguchi R,Abumiya M,et al.Novel atmospheric scorodite synthesis by oxidation of ferrous sulfate solution.Part II.Effect of temperature and air[J].Hydrometallurgy,2008,90(2/3/4):85-91.
[9]贾海,唐新村,刘洁,等.高砷废水处理及含砷废渣稳定化的试验研究[J].安全与环境工程,2013,20(3):53-57.Jia Hai,Tang Xincun,Liu Jie,et al.Experimental study on the stabilization of arsenic-containing waste residue and the treatment of high-arsenic wastewater[J].Safety and Environmental Engineering,2013,20(3):53-57.
[10]Manning BA,Fendorf S E,Bostick B,et al.Arsenic(Ⅲ)oxidation and arsenic(Ⅴ)adsorption reactions on synthetic birnessite[J].Environmental Science&Technology,2002,36(5):976-981.
[11]Tournassat C,Charlet L,Bosbach D,et al.Arsenic(Ⅲ)oxidation by birnessite and precipitation of manganese(Ⅱ)arsenate[J].Environmental Science&Technology,2002,36(3):493-500.
[12]谭春梅.砷的管理和稳定化[J].中国有色冶金,2017,46(2):1-6.Tan Chunmei.Arsenic management and stabilization[J].China Nonferrous Metallurgy,2017,46(2):1-6.
[13]崔日成,杨洪英,富瑶,等.不同含砷类型金矿的细菌氧化-氰化浸出[J].中国有色金属学报,2011,21(3):694-699.Cui Richeng,Yang Hongying,Fu Yao,et al.Biooxidation-cyanidation leaching of gold concentrates with different arsenic types[J].The Chinese Journal of Nonferrous Metals,2011,21(3):694-699.
[14]黄宝贵.高含量砷(Ⅲ)与砷(Ⅴ)的萃取分离法研究[J].冶金分析,1995,15(4):7-11.Huang Baogui.Investigation on the method of extractionseparation for high contents of As(Ⅲ)and As(Ⅴ)[J].Metallurgical Analysis,1995,15(4):7-11.
[15]钟正美.快速碘量法测定微量砷[J].铀矿冶,1986(3):67-69.Zhong Zhengmei.Determination of trace arsenic by rapid iodometric method[J].Uranium Mining and Metallurgy,1986(3):67-69.
[16]杨中超,朱利军,刘锐平,等.强酸性高浓度含砷废水处理方法与经济性评价[J].环境工程学报,2014,8(6):2205-2210.Yang Zhongchao,Zhu Lijun,Liu Ruiping,et al.Economic evaluation on technologies for treatment of stronglyacidic wastewater with high arsenic concentrations[J].Chinese Journal of Environmental Engineering,2014,8(6):2205-2210.