"Removal and recycling of lead from wastewater of waste lead-aci
「"Removal and recycling of lead from wastewater of waste lead-aci」於資料集「EPQSummary_WasteManagement」由單位「行政院環境保護署」的郭先生所提供，聯繫電話是02-2311-7722 EXT.2399，最近更新時間為：2022-01-15 01:13:53。 欄位Project Title的內容是"Removal and recycling of lead from wastewater of waste lead-acid battery treatment plants" ， 欄位Project Subject的內容是"Lead acid batteries are commonly used in the automobiles. The Environmental Protection Administration (EPA) has estimated that about 50,000 tonnes of lead acid battery waste were created every year. Recycling processof lead-acid batteries causes a lot of interest in the issues of the environmental protection.A treatment method is disclosed. The treatment method can recycle lead from air pollution control residues (APCR). In the treatment method, at first, APCR is well mixed with waste sodium hydroxide to release lead ion from APCR. Then, an electrolysis device including at least one cathode and at least one anode is provided for the leachate. Thereafter, an electrolyzing step is performed to use the electrolysis device to electrolyze the leachate so as to reduce the lead ions on the cathode for metal recovery.A hydro-electrometallurgical process to treat with fly ash by leachant and leachate electrolyte on lead recovery was proposed. This study was undertaken to determine the physical and chemical characterization, leaching and electrolysis characteristics of the fly ash, generated by an actual plant and to investigate various leaching agent yield and leachate electrolysis on lead recovery. The fly ash from spent of discarded lead-acid batteries contains mostly lead compound, the main content of A1 sample lead was 66.3%, the particle size distribution of A1 sample 90% was ＜24.8 μm . X-ray powder diffractograms of the fly ash were identification of PbO2.PbO and PbSO4. It can be solubilized with leaching agent, the result being solubility lead that can ultimately be exposed to electrolysis. In order to investigate how [OH−] influences fly ash of leachability , NaOH was used as alkali leaching agent and how [H+] influences fly ash of leachability, HNO3 and CH3COOH were used as leaching agent. The percent of lead leaching yield % in leachate was found between 3.5~69% of fly ash. The parameters considered were the leaching agent concentration, the S/L ratio, and the leaching time under the working circumstances, the optimum conditions was 1.875 M NaOH, S/L ratios of 12, at 8 hour and temperatures 27±3℃, The lead leaching yield % in leachate was found 69% of fly ash. To explore the changes of leachate electrolytic on lead recovery, the anode material and current density and specific energy consumption were also considered during the reaction. The experiments of cathodic Pb and anodic PbO2 electrodeposition, the weight percentage of cathodic Pb and anodic PbO2 for Pb were the range of 22.4~32.1% and 66.0~77.6% during 120 min electrolysis, respectively. We aimed at developing a process using both reactions simultaneously for treating aqueous of Pb2+ from lead–acid battery recycling plants of fly ash. It was new method to treat of fly ash and considered with economic and environmental issue.1. Component analysis of Fly ash by SEM-EDSThe main elements of fly ash are lead (Pb), sulfur (S), oxygen (O), and the lead weight percentage of fly ash is between 63-78 wt%. Fly ash have a high recovery value because of its high lead (Pb) content. From fly ash leaching and electrolysis experiment, we can know that producing of 1 kilograms of lead cost less than 2 dollars at lead concentrations (20 g / L) conditions. This method is better than pyrometallurgy, which is using in factories. The producing of 1 kilograms of lead cost 3.8 dollars by pyrometallurgy. At the end, the method can produce the purity 99.9% of lead on the electrolytic cathode, the purity of lead fits the quality requirements of crude lead.2. The study of fly ash leaching with waste H2SO41. We can increase the pH of waste H2SO4 and the concentrations of lead by increasing the solid-liquid ratio. Because of increasing the pH of waste H2SO4, we can reduce the cost from waste acid-base neutralization.2. The optimum operating conditions is 1 (kg/L).3. The intial p..." ， 欄位Project Year的內容是2014 ， 欄位Organizer的內容是"Recycling Fund Management Board" ， 欄位Executive Unit的內容是"國立成功大學" ， 欄位Reporting download URL的內容是https://epq.epa.gov.tw/project/filedownload.aspx?fid=74695 ， 欄位Publish Date的內容是20150201 。
Project Title
"Removal and recycling of lead from wastewater of waste lead-acid battery treatment plants"
Project Subject
"Lead acid batteries are commonly used in the automobiles. The Environmental Protection Administration (EPA) has estimated that about 50,000 tonnes of lead acid battery waste were created every year. Recycling processof lead-acid batteries causes a lot of interest in the issues of the environmental protection.A treatment method is disclosed. The treatment method can recycle lead from air pollution control residues (APCR). In the treatment method, at first, APCR is well mixed with waste sodium hydroxide to release lead ion from APCR. Then, an electrolysis device including at least one cathode and at least one anode is provided for the leachate. Thereafter, an electrolyzing step is performed to use the electrolysis device to electrolyze the leachate so as to reduce the lead ions on the cathode for metal recovery.A hydro-electrometallurgical process to treat with fly ash by leachant and leachate electrolyte on lead recovery was proposed. This study was undertaken to determine the physical and chemical characterization, leaching and electrolysis characteristics of the fly ash, generated by an actual plant and to investigate various leaching agent yield and leachate electrolysis on lead recovery. The fly ash from spent of discarded lead-acid batteries contains mostly lead compound, the main content of A1 sample lead was 66.3%, the particle size distribution of A1 sample 90% was ＜24.8 μm . X-ray powder diffractograms of the fly ash were identification of PbO2.PbO and PbSO4. It can be solubilized with leaching agent, the result being solubility lead that can ultimately be exposed to electrolysis. In order to investigate how [OH−] influences fly ash of leachability , NaOH was used as alkali leaching agent and how [H+] influences fly ash of leachability, HNO3 and CH3COOH were used as leaching agent. The percent of lead leaching yield % in leachate was found between 3.5~69% of fly ash. The parameters considered were the leaching agent concentration, the S/L ratio, and the leaching time under the working circumstances, the optimum conditions was 1.875 M NaOH, S/L ratios of 12, at 8 hour and temperatures 27±3℃, The lead leaching yield % in leachate was found 69% of fly ash. To explore the changes of leachate electrolytic on lead recovery, the anode material and current density and specific energy consumption were also considered during the reaction. The experiments of cathodic Pb and anodic PbO2 electrodeposition, the weight percentage of cathodic Pb and anodic PbO2 for Pb were the range of 22.4~32.1% and 66.0~77.6% during 120 min electrolysis, respectively. We aimed at developing a process using both reactions simultaneously for treating aqueous of Pb2+ from lead–acid battery recycling plants of fly ash. It was new method to treat of fly ash and considered with economic and environmental issue.1. Component analysis of Fly ash by SEM-EDSThe main elements of fly ash are lead (Pb), sulfur (S), oxygen (O), and the lead weight percentage of fly ash is between 63-78 wt%. Fly ash have a high recovery value because of its high lead (Pb) content. From fly ash leaching and electrolysis experiment, we can know that producing of 1 kilograms of lead cost less than 2 dollars at lead concentrations (20 g / L) conditions. This method is better than pyrometallurgy, which is using in factories. The producing of 1 kilograms of lead cost 3.8 dollars by pyrometallurgy. At the end, the method can produce the purity 99.9% of lead on the electrolytic cathode, the purity of lead fits the quality requirements of crude lead.2. The study of fly ash leaching with waste H2SO41. We can increase the pH of waste H2SO4 and the concentrations of lead by increasing the solid-liquid ratio. Because of increasing the pH of waste H2SO4, we can reduce the cost from waste acid-base neutralization.2. The optimum operating conditions is 1 (kg/L).3. The intial p..."
Project Year
2014
Organizer
"Recycling Fund Management Board"
Executive Unit
"國立成功大學"
Reporting download URL
Publish Date
20150201
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