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攻克磷酸鐵廢水處理6大難點成為行業發展大事

2022-07-25 10:46:18來源:萊特萊德 閱讀量:22741

導讀:磷酸鐵鋰是一種鋰離子電池電極材料,主要用于各種鋰離子電池。但磷酸鐵鋰制備原料磷酸鐵在生產過程中會產生大量廢水,對環境造成嚴重污染。廢水處理問題不解決,勢必會影響磷酸鐵鋰整個行業的發展。
  新能源材料是新近發展的或正在研發的、性能超群的一些材料,具有比傳統材料更為優異的性能,是實現新能源的轉化和利用以及發展新能源技術的關鍵。常見的新能源材料有鋰電池材料、太陽能電池材料、燃料電池材料、儲氫材料、核能材料等。
 
  磷酸鐵鋰是一種鋰離子電池電極材料,主要用于各種鋰離子電池。其特點是放電容量大,價格低廉,無毒性,不造成環境污染,世界各國正在競相實現產業化生產。與此同時,磷酸鐵鋰制備原料磷酸鐵在生產過程中會產生大量廢水,對環境造成嚴重污染。廢水處理問題不解決,勢必會影響磷酸鐵鋰整個行業的發展。找到一個合適的工藝來處理磷酸鐵廢水成為當前行業需重視的重要問題之一。
 
  磷酸鐵廢水的母液及洗水pH均為酸性,水溫經一次降溫后30-35%℃,母液硫酸根高達50000-60000mg/L;TDS含量12000- 65000mg/L,其中不乏鈣、鎂、錳、氟等金屬離子。
 
  萊特萊德作為全球流體過濾與分離技術解決方案服務商,公司業務涵蓋凈水處理、中水回用及廢水零排放、廢水資源化綜合利用及物料濃縮分離純化領域,立志做打破行業傳統與技術局限的變革者。在磷酸鐵廢水資源化綜合利用方面,萊特萊德高難度廢水處理技術能耗低,回收率高于傳統技術,在符合環保政策的前提下,幫助企業實現成本縮減。
 
  處理磷酸鐵廢水需要攻克的6大難點如下:
 
  1、預處理含有鐵、錳、鈣、鎂及氟離子等,需要去除以保證膜系統穩定運行;
 
  2、采用多級膜濃縮,需要考慮膜結垢、鐵錳污染膜、磷酸鈣、磷酸銨鎂結垢等問題;
 
  3、考慮鹽的有效截留、廢水不需要降溫仍然需要保證產水符合回用要求;
 
  4、考慮后續蒸發量和磷酸鹽硫酸鹽分離問題;
 
  5、考慮硫酸鹽和磷酸鹽的干燥相關問題;
 
  6、還需要考慮洗水和母液的經濟可行性。
 
  具體處理工藝設計:
 
  分別將母液與洗水分開處理,先除鐵、除錳、除鎂、除鈣,洗水先用預濃RO膜濃縮至35g/L鹽濃度,再和母液處理后的廢水混合送入一次、二次膜濃縮系統濃縮到160g/L的硫酸鹽濃度,最后進行蒸發濃縮;一次、二次膜濃縮系統產水進入中間RO系統脫鹽,與預濃RO產水與蒸發冷凝水混合通過淡化RO凈化,達到產水回用標準。
 
  設備腐蝕、管路污堵的綜合設計:
 
  考慮到廢水由酸性處理到中性,再到中性變成弱酸性蒸發,廢水除雜后微量的氟和氯離子存在富集腐蝕的問題。前端預處理存在鈣垢堵管、磷酸銨鎂緩慢析出堵管的問題,我們選設計1備1用管道設計,降低堵管造成的設備停機。
 
  膜系統結垢風險:考慮在線加入阻垢劑,防止膜結垢,定期設定膜清洗,維護保養好膜系統。
 
  處理磷酸鐵廢水,運用膜法處理工藝,保證處理出水水質;優質的設計理念,可降低企業的投資成本。未來,磷酸鐵鋰電池市場規模還將大幅增加。磷酸鐵鋰在不斷增加產能的同時,也需要考慮當下環境的問題。相信膜技術的應用會讓磷酸鐵廢水處理難題得到解決,為行業發展助力。
 
       原標題:攻克磷酸鐵廢水處理6大難點成為行業發展頭等大事
 
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