發(fā)布時間：2018-03-17 19:25

  本文選題：石煤　切入點：堿浸　出處：《吉首大學》2015年碩士論文　論文類型：學位論文

【摘要】：在石煤提釩工藝中,為了充分利用石煤中的有價元素硅,本研究采用堿浸提釩工藝提取石煤中的釩和硅,分析了石煤釩礦的物相和主要成分分析,探索了直接堿浸、預焙燒堿浸的各影響因素對釩、硅浸出率的影響,考察了添加劑對堿浸提釩效果的影響,通過對浸出液中的釩、硅的有效分離,得到了五氧化二釩和白炭黑兩種產(chǎn)品。采取本工藝提釩,不僅提高了石煤資源的綜合利用率,同時大大降低石煤提釩過程中的煙氣污染。本工藝所采用的直接堿浸提釩工藝,在添加劑二氧化錳用量為2%、粒徑220目、固液比1:0.8、浸出溫度95℃、浸出時間為7h和堿礦比1.7:1的條件下。釩的浸出率為59.3%,硅的浸出率為49.6%,和不加添加劑相比,釩硅的浸出率提高了11.5%,硅的浸出率提高了7.6%。在焙燒溫度850℃、焙燒時間為2h、浸出溫度為95℃、浸出時間為4h、固液比為1:1.4、堿量比為1.2:1和添加劑二氧化錳用量為2%的條件下,釩的浸出率為95.5%,硅的浸出率為67.2%。采用鹽酸調節(jié)p H值,控制攪拌速度在100r/min,緩慢滴加鹽酸至p H值為7.5,控制溫度在70℃下反應1h,浸出液中二氧化硅沉淀率為91.2%,五氧化二釩損失率為3.5%,釩硅分離效果良好;分離后的硅渣經(jīng)p H為3的鹽酸溶液淋洗后得到二氧化硅含量為95.6%的白炭黑,硅的回收率為61.3%,白炭黑產(chǎn)品比表面積為224 m2/g,經(jīng)紅外、X射線衍射分析白炭黑產(chǎn)品為非晶態(tài)結構的水合Si O2,且產(chǎn)品各項質量指標都達到化工行業(yè)標準。采用201樹脂分離富集,釩富集及雜質分離效果顯著。在溫度為303K,p H值為7.5,五氧化二釩濃度為6g·L-1時,201樹脂吸附釩飽和吸附容量為278mg·g-1。釩溶液流速為1.2L·h-1時,動態(tài)平衡吸附量為148mg·g-1。加入氯化銨沉釩時,在p H=8.5,加銨系數(shù)1.6,沉釩時間為2h條件下,沉釩率可達99%以上。沉釩得到的偏釩酸銨產(chǎn)品的紅外光譜圖、XRD圖譜與偏釩酸銨標準圖譜一致。偏釩酸銨煅燒得五氧化二釩產(chǎn)品,其紅外光譜、XRD圖譜與五氧化二釩標準圖譜一致,產(chǎn)品主要技術指標均達到了YB/T 5304-2011粉釩標準。
[Abstract]:In the process of extracting vanadium from stone coal, in order to make full use of the valuable element silicon in stone coal, this study used alkali extraction of vanadium to extract vanadium and silicon from stone coal, analyzed the phase and main components of vanadium ore, and explored the direct alkali leaching. The effect of various factors on the leaching rate of vanadium and silicon was studied. The effect of additives on the extraction of vanadium from leaching solution was investigated. The effective separation of vanadium and silicon in leaching solution was carried out. Vanadium pentoxide and silica were obtained. The vanadium extraction process not only improved the comprehensive utilization rate of stone coal resources, but also greatly reduced the flue gas pollution in the process of extracting vanadium from stone coal. Under the conditions of additive manganese dioxide dosage 2, particle diameter 220 mesh, solid-liquid ratio 1: 0.8, leaching temperature 95 鈩，

本文編號：1626159