研究生: |
黃俊豪 Huang, Jun-Hao |
---|---|
論文名稱: |
粗氧化鋅以硫酸浸漬之過濾行為 The filtration behavior of crude zinc oxide after sulphuric acid leaching |
指導教授: |
申永輝
Shen, Yun-Hwei |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 73 |
中文關鍵詞: | 粗氧化鋅 、電弧爐集塵灰 、過濾性質 、水洗 、過濾比阻抗 |
外文關鍵詞: | Crude zinc oxide, Electric arc furnace, Filtering property, Water washing, Specific Resistance to Filtration |
相關次數: | 點閱:91 下載:1 |
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粗氧化鋅樣品為鋅含量較高(大於40%)之資源化產品,也富含鐵、鉛等重金屬,極具有回收精煉之價值。其來源為電弧爐集塵灰(EAFD)經旋轉窯法處理(Waelz kiln process)處理後之半成品。隨著台灣電弧爐集塵灰產量不斷增加,許多業者投入粗氧化鋅之產品開發,最後將其賣給下游廠商製作氧化鋅或精煉鋅之處理。
許多廠商以硫酸浸漬粗氧化鋅後,經由過濾方法取其硫酸鋅(濾液)予以純化,但在過濾時,其浸漬後產物常產生過濾性不佳或是難過濾之問題,導致後續精煉純化之困難。
因此,本研究主要針對不同品位之粗氧化鋅樣品經硫酸浸漬後,以成份分析方法、殘渣粒徑之分析及過濾比阻抗分析,以期能歸納其影響過濾性之因素。研究結果顯示,以成份分析方法,大於0.6 N HCl可以破壞鋅鐵尖晶石結構;以粒徑分析方法,發現硫酸鉛殘渣(PbSO4)顆粒主要分佈於10 μm,鋅鐵尖晶石顆粒主要分佈於1~5μm,為造成過濾性不佳之主因。
Crude zinc oxide is the product of the Waelz kiln process for the processing of EAF dust. With increasing amount of EAF dust produced in Taiwan, many company jump into the production and sale of crude zinc oxide to downstream firms for manufacturing of zinc oxide. Crude zinc oxide is a valuable resource with high zinc content (>40%). it also contains other valuable metals such as lead and iron. Usually the zinc in crude zinc oxide was recovered by sulphuric acid leaching and filtration. However, the filterability of leachate produced by sulphuric acid leaching is very poor.
Therefore, the objective of this study focused on the filterability improvement of leachate produced by sulphuric acid leaching. The filterability was evaluated by parameters such as the residue particle size analysis and Specific Resistance to Filtration(SRF). The results of this study show that using 0.6 N of HCl can destroy the structure of zinc-iron spinel in leachate and the size of residued PbSO4 particles is mainly distributed around 10 μm. The ZnFe2O4 particles mainly distributed in the sze range of 1 ~ 5μm, and is the main cause of poor filterability.
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