| 114 | 0 | 8 |
| 下载次数 | 被引频次 | 阅读次数 |
采用钠化焙烧—水浸工艺从钒渣中提钒时，浸出液中的硅会与碱反应形成硅酸钠并进入溶液，影响产品回收率和质量。针对这一问题，研究了采用镁盐法选择性沉淀钒浸出液中的硅，通过绘制Mg-Si-V-H2O体系的热力学平衡图，分析了pH在7～14范围内，体系中各游离离子的分布特性。同时，建立了pH与沉淀饱和指数的关系曲线，探讨了MgSiO3和Mg(VO3)2在不同pH条件下的沉淀行为。计算结果表明，MgSiO3溶解度较低，而Mg(VO3)2溶解度相对较高，可实现钒浸出液中硅的选择性沉淀。验证试验结果表明，溶液pH对钒浸出液中硅的沉淀率有较大影响，当pH=10时，硅沉淀率达86.3%,钒损失率仅为3.2%,效果较好。
Abstract：During the process of extracting vanadium from vanadium slag by sodium roasting-water leaching method, silicon in the leaching solution will react with alkali to form sodium silicate and enter the solution, affecting the recovery rate and quality of the product.To address this issue, the selective precipitation of silicon in vanadium leachate by the magnesium salt method was studied.Thermodynamic equilibrium diagrams of the Mg-Si-V-H2O system were constructed to investigate the distribution characteristics of free ions within the pH range of 7～14.Additionally, the relationship between pH and precipitation saturation indices was established to evaluate the precipitation behaviors of MgSiO3 and Mg(VO3)2 under different pH conditions.The calculation results reveal that the solubility of MgSiO3 is relatively low, while that of Mg(VO3)2 is relatively high, which can achieve the selective precipitation of silicon in the vanadium leaching solution.The verification test results demonstrate that the pH of the solution has a significant influence on the precipitation rate of silicon in the vanadium leaching solution.When pH=10,the silicon precipitation rate can reache 86.3%,and the vanadium loss rate is only 3.2%,with a good effect.
[1] PENG H,GUO J,LI B,et al.Vanadium properties,toxicity,mineral sources and extraction methods:a review[J].Environmental Chemistry Letters,2022,20(2):1249-1263.
[2] 高健，吴伟，沙雨燕，等.钒渣焙烧过程钒元素价态变化特征探讨[J].湿法冶金，2024,43(2):147-152.GAO Jian,WU Wei,SHA Yuyan,et al.Discussion on variation characteristics of vanadium element valence state during roasting process of vanadium slag[J].Hydrometallurgy of China,2024,43(2):147-152.
[3] WEN J,JIANG T,SUN H Y,et al.Novel understanding of simultaneous extraction of vanadium and manganese from vanadium slag and low-grade pyrolusite based on selective oxidation-reduction roasting[J].ACS Sustainable Chemistry & Engineering,2020,8(15):5927-5936.
[4] 滕晓慧，孙丽月，庄立军.沉钒废水除硅制备冶金级氢氧化铬研究[J].无机盐工业，2020,52(9):88-90.TENG Xiaohui,SUN Liyue,ZHUANG Lijun.Study on preparation of metallurgical grade chromium hydroxide byremoving silicon from vanadium wastewater[J].Inorganic Chemicals Industry,2020,52(9):88-90.
[5] 刘波.碱性含钒浸出液除硅研究及高纯五氧化二钒制备[J].钢铁钒钛，2019,40(5):8-15.LIU Bo.Desilication from alkali leaching solution containing vanadium and preparation of high purity vanadium pentoxide[J].Iron Steel Vanadium Titanium,2019,40(5):8-15.
[6] 阳亚玲，颜文斌，华骏，等.含钒浸出液除硅试验研究[J].非金属矿，2015,38(2):8-10.YANG Yaling,YAN Wenbin,HUA Jun,et al.Silicon removal from vanadium leaching solution[J].Non-Metallic Mines,2015,38(2):8-10.
[7] HE L H,XU W H,SONG Y F,et al.Selective removal of magnesium from a lithium-concentrated anolyte by magnesium ammonium phosphate precipitation[J].Separation and Purification Technology,2017,187:214-220.
[8] ZHANG W G,ZHANG T G,SUN Y,et al.Thermodynamic analysis of phosphorus-sulfur-vanadium-water acidic system for the extraction of vanadium[J].Rare Metal Materials and Engineering,2021,50(12):4265-4271.
[9] LATOUR I,MIRANDA R,BLANCO A.Optimization of silica removal with magnesium chloride in papermaking effluents:mechanistic and kinetic studies[J].Environmental Science and Pollution Research,2016,23:3707-3717.
[10] 彭鹏，宋汉周，吴志伟.基于化学热力学的饱和指数模型求解方法的改进[J].水文地质工程地质，2009,36(5):76-79.PENG Peng,SONG Hanzhou,WU Zhiwei.Modification of solution method of the saturation index model based on the chemical thermodynamics[J].Hydrogeology & Engineering Geology,2009,36(5):76-79.
基本信息:
DOI：10.13355/j.cnki.sfyj.2025.05.002
中图分类号:TF841.3
引用信息:
[1]韦林森,潘少彦,李煊等.钒渣浸出液Mg-Si-V-H_2O体系的热力学分析及硅的选择性分离研究[J].湿法冶金,2025,44(05):592-596+612.DOI:10.13355/j.cnki.sfyj.2025.05.002.
基金信息:
国家自然科学基金资助项目(52174331)