Distribution behavior of chromium and sulfur elements during co-treatment of vanadium extraction tailings and red mud
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摘要: 钒渣钠化焙烧-水浸提钒过程会产生含有30%～40%Cr2O3的提钒尾渣，形成年堆积百万吨固废。通过加入高铁赤泥协同还原提钒尾渣，赤泥中的Fe2O3在低于铬氧化物初始还原温度下已经被C还原，促使铬还原反应快速进行，从而提升Cr的回收效率。使用FactSage热力学软件对整个反应体系进行模拟，计算了原料铬铁比、炉渣碱度和配C/Si量对铬、硫元素分配行为的影响，得到原料适宜的铬铁比是0.18，炉渣碱度是1.8，配C量nC/O=1.1，配Si量nSi/O=0.2。该研究为含铬提钒尾渣和高铁赤泥的资源化处理和增值化应用提供了一种新的可行性方案。Abstract: The process of blast furnace iron-oxygen top blowing converter blowing vanadium extraction-vanadium slag followed by sodium roasting-water leaching and vanadium extraction will form vanadium tailings containing 30%～40% Cr2O3, forming an annual accumulation of millions of tons of solid waste. In this study, the vanadium tailings were extracted by synergistic reduction of high-iron red mud, and the Fe2O3 in the red mud was reduced by carbon at a temperature lower than the initial reduction temperature of chromium oxide, which promoted the rapid progress of chromium reduction and improved the recovery efficiency of Cr. The whole reaction system was simulated by FactSage thermodynamic software, and the effects of the chromium iron ratio, slag alkalinity and C/Si content on the partition behavior of chromium and sulfur were calculated. The suitable Cr/Fe ratio of the raw materials was 0.18, the alkalinity of the slag was 1.8, the amount of carbon was nC/O = 1.1, and the amount of Si was nSi/O = 0.2. This study provides a new feasible scheme for the resource treatment and value-added application of Cr-containing vanadium tailings and high-iron red mud.
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图 3 原料铬铁比对铬、硫元素分配行为的影响
(a) 渣中Cr2O3含量及铬在渣金间的分配比；(b)硫在气-渣-金三相中的分配
Figure 3. Effect of raw material chrome-iron ratio on distribution behavior of chromium and sulfur elements
图 4 炉渣碱度对铬、硫元素分配行为的影响
(a) 渣中Cr2O3含量及铬在渣金间的分配比；(b)硫在气-渣-金三相中的分配
Figure 4. Effect of slag basicity on distribution behavior of chromium and sulfur elements
图 5 配C量对铬、硫元素分配行为的影响
(a) 渣中Cr2O3含量及铬在渣金间的分配比；(b)硫在气-渣-金三相中的分配
Figure 5. Effect of carbon amount on distribution behavior of chromium and sulfur elements
图 6 配Si量对铬、硫元素分配行为的影响
(a) 渣中Cr2O3含量及铬在渣金间的分配比；(b)硫在气-渣-金三相中的分配
Figure 6. Effect of ferrosilicon amount on distribution behavior of chromium and sulfur elements
表 1 含铬提钒尾渣的主要化学成分
Table 1. The main chemical composition of vanadium tailings containing chromium
% Na2O SiO2 CaO V2O5 Cr2O3 SO3 其他 6.27 21.92 1.27 4.35 30.5 13.85 21.84 
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表 2 高铁赤泥的主要化学成分
Table 2. The main chemical composition of high-iron red mud %
Al2O3 SiO2 Fe2O3 TiO2 CaO MgO Na2O 其他 7.23 3.46 76.05 2.90 2.53 0.44 0.83 6.56
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