【摘要】：高鉻型釩鈦磁鐵礦在綜合利用過程中將獲得高鉻型釩渣,其含有我國重要的戰(zhàn)略儲備金屬釩和鉻,不合理利用高鉻釩渣不僅浪費(fèi)資源還將帶來巨大的環(huán)境隱患。本文選用"鈉化焙燒-水浸-除雜-沉釩-鉻溶液還原沉鉻-尾渣脫鈉返高爐"工藝綜合利用高鉻釩渣。對上述工藝進(jìn)行研究后,獲得如下結(jié)論:a.高鉻釩渣中的釩、鉻主要賦存于占比約29%尖晶石相;b.鈉鹽能降低高鉻釩渣的氧化溫度,能與釩鉻鐵尖晶石發(fā)生鈉化反應(yīng),實現(xiàn)高鉻釩渣中的釩、鉻共提取;c.鈉化焙燒-水浸工藝參數(shù)選擇:焙燒溫度850℃、鈉鹽配比50%、焙燒時間120min、80℃浸出30min、液固比2:1;c.銨-鎂復(fù)合鹽能去除含釩鉻浸出液中的As、Si、P等雜質(zhì),除雜劑加入量為銨鹽10倍理論量,鎂鹽5倍理論量,溫度80℃,pH值9,時間1h;d.在pH值1.8,溫度120℃,反應(yīng)180min條件下,水熱法水解沉釩可獲得90%的沉釩率,鉻損率為6%;e.還原沉鉻工藝參數(shù)為:還原pH值4,還原劑量為理論量的1.1倍,室溫,反應(yīng)30 min,沉鉻最佳pH值為6.9;f.尾渣中高價鉻在添加15%的煤粉,1000℃還原焙燒30min后,可解毒;g.尾渣經(jīng)石灰水熱法脫鈉后,可以返高爐利用,脫鈉工藝參數(shù)為:脫鈉溫度不低于160℃,時間2h以上,液固比不小于5:1,CaO/Na2O大于2。試驗最終獲得了 V2O5含量大于99%的氧化釩產(chǎn)品,Cr2O3含量大于98%的氧化鉻產(chǎn)品。
[Abstract]:In the process of comprehensive utilization of high chromium type vanadium titanomagnetite, high chromium type vanadium slag will be obtained, which contains important strategic reserves of vanadium and chromium in China. The unreasonable utilization of high chromium vanadium slag will not only waste resources but also bring huge environmental hazards. In this paper, high chromium vanadium slag is synthetically utilized by "sodium roasting, water leaching, impurity removal, precipitation vanadium-chromium solution reducing chromium-tailings sodium removal back to blast furnace" process. The conclusion is as follows: a. The vanadium and chromium in the slag of high chromium and vanadium are mainly located in the spinel phase of about 29%, b. Sodium salt can reduce the oxidation temperature of high chromium-vanadium slag and can react with vanadium ferrochrome spinel to achieve the co-extraction of vanadium and chromium from high chromium-vanadium slag. The selection of technological parameters for sodium roasting and water leaching is as follows: calcination temperature 850 鈩，

本文編號：2423806