高铬钒渣综合利用研究
发布时间：2019-02-15 23:30
【摘要】：高铬型钒钛磁铁矿在综合利用过程中将获得高铬型钒渣,其含有我国重要的战略储备金属钒和铬,不合理利用高铬钒渣不仅浪费资源还将带来巨大的环境隐患。本文选用"钠化焙烧-水浸-除杂-沉钒-铬溶液还原沉铬-尾渣脱钠返高炉"工艺综合利用高铬钒渣。对上述工艺进行研究后,获得如下结论:a.高铬钒渣中的钒、铬主要赋存于占比约29%尖晶石相;b.钠盐能降低高铬钒渣的氧化温度,能与钒铬铁尖晶石发生钠化反应,实现高铬钒渣中的钒、铬共提取;c.钠化焙烧-水浸工艺参数选择:焙烧温度850℃、钠盐配比50%、焙烧时间120min、80℃浸出30min、液固比2:1;c.铵-镁复合盐能去除含钒铬浸出液中的As、Si、P等杂质,除杂剂加入量为铵盐10倍理论量,镁盐5倍理论量,温度80℃,pH值9,时间1h;d.在pH值1.8,温度120℃,反应180min条件下,水热法水解沉钒可获得90%的沉钒率,铬损率为6%;e.还原沉铬工艺参数为:还原pH值4,还原剂量为理论量的1.1倍,室温,反应30 min,沉铬最佳pH值为6.9;f.尾渣中高价铬在添加15%的煤粉,1000℃还原焙烧30min后,可解毒;g.尾渣经石灰水热法脱钠后,可以返高炉利用,脱钠工艺参数为:脱钠温度不低于160℃,时间2h以上,液固比不小于5:1,CaO/Na2O大于2。试验最终获得了 V2O5含量大于99%的氧化钒产品,Cr2O3含量大于98%的氧化铬产品。
[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，
本文编号：2423806
[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，
本文编号：2423806
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