An efficient utilization of high chromium vanadium slag: Extraction of vanadium based on manganese carbonate roasting and detoxification processing of chromium-containing tailings.
An efficient utilization of high chromium vanadium slag: Extraction of vanadium based on manganese carbonate roasting and detoxification processing of chromium-containing tailings.
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DOI：
10.1016/j.jhazmat.2019.06.010
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发表时间：
2019-10
影响因子：
13.6
通讯作者：
Jing Wen;T. Jiang;Junpeng Wang;Huiyang Gao;Longgang Lu
中科院分区：
文献类型：
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作者：
Jing Wen;T. Jiang;Junpeng Wang;Huiyang Gao;Longgang Lu
采用以碳酸锰（MnCO3）为添加剂的新型焙烧方法，从高铬钒渣（HCVS）中高效分离回收钒。对含铬钒尾矿进行碳还原和熔炼，得到铁铬合金。采用x射线衍射仪（XRD）和扫描电镜（SEM）对HCVS利用的全过程进行了分析。在HCVS中加入mnco3， MnO与V2O3的摩尔比(n（MnO)/n(V2O3)）为2.0,850 ℃加热120 min， pH值为2.5时，可浸出89.37%的钒和0.10%的铬。用（NH4） 2so4沉淀出99.19%的钒，得到纯度为99.28%的v2o5。碳酸锰焙烧过程中排放的二氧化碳经碳化沉淀后，可回收84%以上的锰助剂，可作为焙烧原料助剂。钒锰浸出后的废水可作为浸出介质循环使用。三条流通路线实现了原料和产品的闭环流通，节约了生产成本，避免了环境污染。从含铬钒尾矿中获得了铁含量为67.35%、铬含量为13.28%的铁铬合金，可回收炼钢。
A novelty roasting method with manganese carbonate (MnCO3) as additive was carried out to separate and recover vanadium from high chromium vanadium slag (HCVS) efficiently. Vanadium tailings containing chromium was detoxified by carbon reduction and smelting to form Fe-Cr alloy. The whole process of HCVS utilization was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). 89.37% of vanadium and 0.10% of chromium was leached when MnCO3was added to HCVS at the mole ratio of MnO in MnCO3and V2O3in HCVS (n(MnO)/n(V2O3)) of 2.0 and heating at 850 °C for 120 min, then leached under the pH value at 2.5. 99.19% of vanadium was precipitated by (NH4)2SO4and V2O5with a purity of 99.28% was prepared. More than 84% of manganese addictive was recovered after manganese precipitation by carbonization with CO2discharged from manganese carbonate roasting, which could be used as the raw addictive for roasting. The wastewater after vanadium and manganese extraction could be circulated as leaching medium. Three circulation routes realized the closed-circuit circulation of raw materials and products, saving the production costs and avoiding the environmental pollution. Fe-Cr alloy with 67.35% of Fe and 13.28% of Cr was obtained from chromium-containing vanadium tailings, which could be returned to the steelmaking process.