以碳酸氫銨溶液處理廢鉛蓄電池回收業硫酸鉛膏之再利用技術研發（II）- 實廠驗證
| 中文摘要 | 廢鉛蓄電池回收物料中鉛膏含有大量硫酸鉛成份，其回收率高低直接影響廢鉛蓄電池再利用成本及市場競爭力。有鑑於此，本研究乃針對廢鉛蓄電池的鉛膏進行回收處理技術的探討，並且於本年度針對最佳條件進行實廠驗證。本研究於102年度計畫(以下簡稱上年度計畫)採用碳酸氫銨為新型脫硫劑，達成提高鉛膏脫硫效率的目標。尤其本計畫碳酸氫銨的製備係利用氨水吸收煙道廢氣中二氧化碳，不但可以製備碳酸氫銨，還可降低廢氣中溫室氣體的排放量，並利用此套資源再利用循環系統，提高鉛產品純度及價值、提升廢鉛蓄電池再利用比率、降低污染排放、改善管線腐蝕現象、減少能源消耗及改善異味污染等問題。本研究透過實廠測試獲得結果，在脫硫攪拌實驗中鉛膏的脫硫效率爲80.3%。在熔煉後產出之鉛成品純度高達99.97%，顯示鉛純度因脫硫反應而提高，而鉛產出率也較原製程提高約10%，以單價50,000元/噸則估算獲利5,000元/噸，而使用NH4HCO3支出1,035元/噸，綜合鉛膏加熱還原所使用各配料的成本可知，應用脫硫前處理製程的鉛回收生產成本較未脫硫製程的收益增加4,253元/噸。脫硫製程在CO2連續監測期間，12%氨水吸收CO2的效率範圍為70.3% ~ 90.8%，平均吸收效率為82.0%，可有效降低CO2溫室氣體的排放。此外脫硫前處理製程對廠房內空氣品質亦有所改善（SO2濃度由50 ppb降為30 ppb；TVOC濃度由289 ppb降為65 ppb；TSP由295 μg/m3降為269 μg/m3；CO2濃度由606 ppm降為594 ppm），其中鉛膏中硫含量減少，故降低廠房內SO2濃度。於實驗室內將脫硫反應後的濾液（含SO42-濃度455.0 g/L）與Ca(OH)2混合，可製備出質量分率為9.7%的NH3·H2O，但所生成之CaSO4與殘留Ca(OH)2較難分離，後續研究可針對脫硫反應剩餘的硫酸銨和碳酸氫銨的混合液之再循環使用技術深入探討，俾提高本研究技術的可行性。 | ||
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| 中文關鍵字 | 廢鉛蓄電池、鉛膏脫硫、碳酸氫銨、循環再利用、污染減量 | ||
基本資訊
| 專案計畫編號 | EPA-104- X02 | 經費年度 | 104 | 計畫經費 | 1750 千元 |
|---|---|---|---|---|---|
| 專案開始日期 | 2015/01/01 | 專案結束日期 | 2015/11/30 | 專案主持人 | 袁中新 |
| 主辦單位 | 回收基管會 | 承辦人 | 歐真妤 | 執行單位 | 金聯成資源科技股份有限公司 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
|---|---|---|---|
| 期末報告 | 以碳酸氫銨溶液處理廢鉛蓄電池回收業硫酸鉛膏之再利用技術研發20151209.pdf | 3MB |
Technology Development of Lead Sulfate Paste Reusing for Waste Automotive Battery Recycling Industry
| 英文摘要 | During the waste automotive lead battery recycling process, lead paste is abundant of lead sulfate whose recovery rate highly influences the profit of battery recycling and the capability of market competition. This study aims to improve the existing battery recycling technology for recovering lead in the waste automotive batteries in the project of last year, and conducted factory verification to obtain the best operating condition. This study applied ammonium bicarbonate (NH4HCO3) as a new desulfurization reagent, which can be produced by absorbing carbon dioxide in the flue gas with ammonia solution. This innovative technology can not only produce ammonium bicarbonate, but also reduce the emission of greenhouse gases from the stacks. The advantages of this innovative technology include high purity and value of lead products, high recycling efficiency of waste automotive lead battery, low emission of air pollutants, less corrosion of pipelines, low energy consumption, and less odorous problems. The results were obtained from the factory verification experiments. In the process of desulfurization stirring, the desulfurization efficiency of lead paste was 80.3%. The purity of the refined lead reached 99.97% that was slightly higher than the traditional lead production process, indicating that the desulfurization of lead paste is beneficial to enhance the purify the recycled lead. As high as 10% of lead recovery ratio can be reached for the desulfurization process compared to that without desulfurization, with a profit of approximately 5,000 NT/ton due to the improvement of lead recovery rate. But 1,035 NT/ton was required for the addition of NH4HCO3 as the desulfurization agent. By comparing the cost-benefit of all items during the lead recovery process with and without desulfurization, the unit profit with the desulfurization process was 4,253 NT/ton higher than that without desulfurization. During the continuous monitoring of CO2 absorbed by the ammonium solution, the adsorption efficiencies of CO2 ranged from 70.3% to 90.8% with an average of 82.0%. Additionally, the air quality of the manufactory zone was improved ( the reduction of SO2 concentration from 50 ppb to 30 ppb; the reduction of TVOC concentration from 289 ppb to 65 ppb; the reduction of TSP concentration from 295 μg/m3 to 269 μg/m3; and the reduction of CO2 concentration from 606 ppm to 594 ppm), particularly for the level of SO2 that was emitted from the reverberatory furnace due to the desulfurization prior to the reduction process. By the addition of Ca(OH)2 to the (NH4)2SO4 filtrate after desulfurization, NH3·H2O was recovered with the mass ratio of 9.7%, however, the separation of CaSO4 from Ca(OH)2 was somehow difficult. Further works focused on recycling the mixture of ammonium sulfate and ammonium bicarbonate solution is essential to promote the technological feasibility of the desulfurization process. | ||
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| 英文關鍵字 | Waste lead battery, lead paste desulfurization, ammonium bicarbonate, recycling and reuse, pollution reduction | ||