Separation of V and Mn in calcification roasting-acid leachate of V slag by simultaneous amine extraction and CO2 mineralization
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摘要: 钒渣钙化焙烧酸浸液中钒锰浓度高，针对钒锰分离难度大、成本高的问题，提出并研究了胺萃取耦合CO2矿化分离钒锰新工艺。分析了钒锰分离过程的化学基础，研究了酸浸液中各金属元素在有机相、水相和固相中的分配规律，考察了钒锰浓度、胺再生等对钒锰分离效率的影响，并对该工艺的技术经济性进行了初步评估。 结果表明，对于高锰浓度酸浸液，钒的萃取率可达99%；胺再生循环使用5次后，钒的萃取率仍保持在97%，锰的沉淀率为96%，该工艺具有较高的技术性和经济性。Abstract: The efficient separation of vanadium and manganese from an acid leachate of the calcification roasting vanadium slag is quite difficult and costly, particularly for those leachates with high vanadium and manganese concentrations. A novel process was investigated for the separation of vanadium and manganese using trioctylamine and CO2. The chemical separation basic of V and Mn was discussed. The distribution law of the major metallic components, particularly V and Mn, of the acid leachate in organic phase, aqueous phase and precipitated phase were quantified. The effects of concentrations of vanadium and manganese, and the recycle of trioctylamine on the separation efficiency were elucidated. The techno-economic feasibility of the new process was discussed. The results show that a vanadium extraction rate of 99% can be achieved even for an acid leachate with high concentration of manganese. The vanadium extraction rate of 97% and manganese precipitation rate of 96% are maintained after 5 regeneration cycles. The new process is techno-economically applausive.
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图 1 有机胺萃取耦合CO2矿化分离钙化焙烧酸浸液中钒锰的工艺流程
Figure 1. Schematic process for separation of V and Mn in acidic leachate of calcified roasting vanadium slag
图 2 V(Ⅴ)-S-H2O体系在298.15 K时的活度-pH关系
Figure 2. Activity-pH diagram of the V(Ⅴ)-S-H2O system at 298.15 K
图 3 有机胺萃取剂再生循环次数对分离V和Mn的影响
Figure 3. Effect of the number of regenerated cycles organic amine on separation of V and Mn
表 1 钒渣酸浸液的主要金属元素含量
Table 1. Content of the major metallic elements in acid leachate of vanadium slag
g/L V Mn Ca Al Mg Cr Si Ti 23.44 3.247 0.9646 0.0808 3.631 0.01135 0.0835 0.0325 
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表 2 酸浸液主要金属元素在有机萃取相和水相中的平衡浓度
Table 2. Equilibrium concentration of major metallic elements both in organic and aqueous phases
元素 各相平衡浓度/( g·L−1) 萃取率E/ % 分配系数 KD 选择性系数β 酸浸液 萃余水相 有机萃取相 V 23.44 0.0533 5.828 99.77 109.4 Mn 3.247 0.0686 0.000431 2.833 0.006 17403.6 Mg 3.516 3.134 0.0155 1.940 0.004946 22108.52 Ca 0.9646 0.5992 0.01145 7.10 0.01911 5722.14
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表 3 有机胺萃取耦合CO2矿化过程沉淀的主要元素含量
Table 3. Content of the major metallic elements in the precipitation of the simultaneous amine extraction and CO2 mineralization process
% V Mn Ca Mg Cr Ti 0.6857 45.27 0.7574 0.4439 ＜0.01 ＜0.01
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表 4 V2O5产品的化学成分
Table 4. Content of the major chemical compound in V2O5 product
% V2O5 Mn Ca Mg Al Ti Fe 99.56 0.034 0.2117 0.3286 ＜0.01 ＜0.01 ＜0.01
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表 5 两种酸浸液中各金属元素含量
Table 5. Content of the major metallic elements in two kinds of acid leachate
g/L V Mn Ca Mg Al Cr Si Ti 酸浸液-1 23.44 3.247 0.9646 3.631 0.0808 0.0114 0.0835 0.0325 酸浸液-2 24.50 9.750 0.800 3.530 0.0338 0.0129 0.0289 0.0042
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表 6 酸浸液浓度对钒锰分离的影响
Table 6. Effect of acid leachate concentration on the separation of V and Mn
V/Mn 钒的萃取率/ % 锰的萃取率/ % 锰的沉淀率/ % 钒的分配系数 钒锰的选择性系数 酸浸液-1 7.22 99.94 2.833 97.92 109.4 17403.6 酸浸液-2 2.51 99.76 37.86 59.59 75.78 20.43
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