V2O5 promotes the efficient separation and recycling mechanism of iron and manganese components in ferromanganese ore
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摘要: 铁锰矿中铁和锰因物理化学性质相近，现有方法难以实现铁、锰组元的高效分离。文中引入V2O5作为添加剂与铁锰矿混合焙烧，系统研究了混合焙烧过程的物相演变规律及酸浸过程锰、铁、钒元素的迁移分离规律与循环利用机制。结果表明，焙烧后铁锰矿中含锰相转化为酸溶性焦钒酸锰，而铁和硅仍然以Fe2O3和SiO2形式存在。焙烧熟料经pH为2和1.8两段酸浸后，Mn、Fe和V的浸出率分别为81.25%、
0.0074 %和5.77%，实现了锰、铁组元的有效分离。含锰浸出液真空干燥得到MnSO4，可作为锰冶金和锰化工的中间产品。酸浸渣经碱浸后实现了铁、钒分离，富铁尾渣中Fe2O3含量达83.02%，可作为高炉炼铁原料。碱浸液经水解沉淀和焙烧得到V2O5可返回焙烧体系，其循环利用率达90%以上，该过程产生的废水也可返回浸出体系再次利用。该研究为共伴生铁锰资源的清洁高效利用提供了一个新方法。Abstract: Due to the similar physical and chemical properties of iron and manganese in ferromanganese ore, it is difficult to achieve efficient separation of iron and manganese components by using existing methods. In this paper, V2O5 was introduced as an additive for mixed roasting with iron-manganese ore, and the phase evolution of the mixed roasting process, the migration and separation of manganese, iron and vanadium elements in the acid leaching process and the recycling mechanism were systematically studied. The results show that the manganese-containing phase in the iron-manganese ore is converted into acid-soluble manganese pyrovanadate after roasting, while iron and silicon still exist in the form of Fe2O3 and SiO2. The leaching rates of Mn, Fe and V reach 81.25%, 0.0074% and 5.77%, respectively, after acid leaching at pH 2.0 and 1.8, respectively, which realizes the effective separation of manganese and iron components. MnSO4 is obtained by vacuum drying of manganese-containing leaching solution, which can be used as an intermediate product in manganese metallurgy and manganese chemical industry. The separation of iron and vanadium is realized after alkali leaching, and the Fe2O3 content in the iron-rich tailings reaches 83.02%, which can be used as a raw material for blast furnace ironmaking. The V2O5 obtained from alkali leaching solution can be returned to the roasting system after hydrolysis precipitation and roasting, and its recycling rate is more than 90%, and the wastewater generated in the process can also be returned to the leaching system for reuse. This study provides a new method for the clean and efficient utilization of co-associated iron-manganese resources.-
Key words:
- V2O5 /
- ferromanganese ore /
- iron-manganese separation /
- manganese pyrovanadate /
- recycling
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图 2 铁锰矿的SEM形貌以及主要元素分布
Figure 2. SEM pattern of ferromanganese ore and major element maps
图 4 不同n(MnO2)/n(V2O5)下焙烧熟料的XRD谱
Figure 4. XRD images of roasted clinker under different n(MnO2)/n(V2O5) conditions
图 5 不同n(MnO2)/n(V2O5)下焙烧熟料的SEM形貌、主要元素分布
(a) n(MnO2)/n(V2O5)=1；(b) n(MnO2)/n(V2O5)=2.25；(c) n(MnO2)/n(V2O5)=3
Figure 5. SEM and main element distribution maps of roasted clinker under different n(MnO2)/n(V2 O5) conditions
图 6 不同n(MnO2)/n(V2O5)下主要元素的浸出率及质量分数
(a) 锰的浸出率、尾渣中锰的质量分数；(b) 铁的浸出率；(c) 钒的浸出率
Figure 6. The leaching efficiency and mass fraction of the main elements under different n(MnO2)/n(V2O5) conditions
图 7 含钒含铁浸出尾渣的SEM形貌和主要元素分布
Figure 7. SEM and main element distribution maps of vanadium-containing iron leaching tailings
图 11 富铁尾渣的SEM形貌和主要元素分布
Figure 11. SEM pattern and main element distribution maps of iron-rich tailings
表 1 铁锰矿的化学成分分析
Table 1. Chemical composition analysis of ferromanganese ore
% Fe2O3 MnO2 SiO2 Al2O3 合计 66.27 26.97 4.63 1.69 99.56 
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表 2 富铁尾渣的化学成分分析
Table 2. Chemical composition analysis of iron-rich tailings
% Fe2O3 MnO2 V2O5 SiO2 Al2O3 合计 83.02 6.44 0.52 5.17 2.06 97.21
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