利用钒渣钠化焙烧-水浸工艺得到的钒浸出液为原料,进行了酸性铵盐沉钒试验、多钒酸按溶解度测定试验和x射线衍射表征,研究了温度为75～95℃和pH值为2.0～5.0范围内,温度和反应终点pH值对酸性铵盐沉钒沉钒的影响.研究结果表明:随着pH值的降低和沉淀温度的升高,沉淀产物晶体物相和杂质含量显著变化.pH值从5.0下降到2.0的过程中,沉淀产物中(NH4)4Na2V10O28·10H2O和(NH4)6V10O28·6H2O逐渐转化为NH4V3O8·O.5H2O,钒沉淀率显著上升,同时沉淀产物中钠、钾和硫含量显著降低;在pH值4.0～5.0范围内,随着温度的上升,沉淀产物由(NH4)4Na2V10O28·10H2O转化为(NH4)6V10O28·6H2O,钒沉淀率上升,同时沉淀物中钠和钾含量降低,所包裹的硫含量增加,沉淀温度为75℃时,沉淀产物主要为(NH4)4N2V10O28·10H2O,沉淀物中钾含量处于0.140%～0.161%之间,硫含量处于0.010%～0.017%之间;在pH 2.0～3.0范围内,沉淀产物主要为NH4V3O8·O.5H20,随着温度的上升,水解产生的多钒酸钠和多钒酸钾中的钠和钾被铵所取代生成NH4V3O8·O.5H20,沉淀产物中钠和钾含量降低,沉淀的最佳工艺条件为pH2.0～2.5,温度为95℃以上,反应2h后,钒沉淀率达99.38%以上,沉淀物中钠,钾和硫含量分别降低至0.300%,0.090%和0.039%.
参考文献
| [1] | Liao Shimi;Bai Tanlun.Vanadium Metallurgical Abroad[M].北京:冶金工业出版社,1985:2. |
| [2] | 马蕾,张一敏,刘涛,黄晶.提高酸性铵盐沉钒效果的研究[J].稀有金属,2009(06):936-939. |
| [3] | 张云,范必威,彭达平.从酸浸石煤的萃取液中沉淀多聚钒酸铵[J].稀有金属,2001(02):157-160. |
| [4] | 邵延海,冯其明,欧乐明,张国范,卢毅屏.从废催化剂氨浸渣中综合回收钒和钼的研究[J].稀有金属,2009(04):606-610. |
| [5] | 李大标.酸性铵盐沉钒条件实验研究[J].过程工程学报,2003(01):53-56. |
| [6] | Li Zhongjun;Pang Xitao;Liu Changrang .Study on precipitation conditions of vanadium with NH4C1 in faintly acid[J].Journal of Zhengzhuou University(Natural Science Edition),1994,26(03):83. |
| [7] | Yang Shaoli.Vanadium and Titanium Materials[M].北京:冶金工业出版社,2007:109. |
| [8] | Li Qianwen;Wang Xiaojiang;Zhang Xinxia .Industrial experiment of precipitation of vanadium with NH4 C1[J].Pangang Technology,2001,24(02):7. |
| [9] | Wang Jinchao;Chen Housheng.Effect of impurities on precipitation of ammonium polyvanadate[J].Vanadium Titanium,1995(5-6):1. |
| [10] | Wang Jinchao;Chen Housheng .Study on precipitation conditions of ammonium polyvanadate[J].Iron Steel Vanadium Titanium,1993,14(02):28. |
| [11] | Zhang Wei;Chen Chongxin .Factors affecting the continuous precipitation of polyammonium vanadate and paln selection[J].Ferro-Alloys,1998,3:22. |
| [12] | Xia Qingrong .Study on ammonium polyvanadate precipitating technology from solution containing high concentrate sodium vanadate[J].Iron Steel Vanadium Titanium,1999,17(03):46. |
| [13] | 蒲年文.浅析蒸汽对沉淀钒的影响[J].铁合金,2003(04):41-44. |
| [14] | Fu Liqun .Study on mechanism of precipitation of floccus polyammonium vanadate[J].Vanadium Titanium,1992,5:15. |
| [15] | Wang Jinchao;Zeng Zhiyong;Li Guisheng;Li Qianwen Wang Xiaojiang .Reasons and countermeasures for APV loss after vanadium precipitation[J].Iron Steel Vanadium Titanium,1999,20(03):37. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%