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| 钒铬还原渣酸浸液中钒铬初步分离工艺 | |
| 引用本文： | 邓孝伯,韦林森,申长帅,李千文,汪超,范兵强,张贺东,张洋.钒铬还原渣酸浸液中钒铬初步分离工艺[J].化工进展,2021,40(7):4100-4107. |
| 作者姓名： | 邓孝伯 韦林森 申长帅 李千文 汪超 范兵强 张贺东 张洋 |
| 作者单位： | 攀钢集团钒钛资源股份有限公司,四川攀枝花617023;郑州中科新兴产业技术研究院,河南郑州450000;中国科学院过程工程研究所,北京100190 |
| 基金项目： | 国家重点研发计划(2018YFC1900505) |
| 摘 要： | 钒铬还原渣是钠化提钒过程的典型危险固体废弃物，其资源化利用需求迫切。中国科学院过程工程研究所提出钒铬还原渣硫酸酸解-钒铬初步分离-铬/钒/铁络合深度分离技术路线，并在攀钢集团建成万吨级示范工程。本文重点考察钒铬还原渣酸解液中钒铬初步分离原理及工艺，研究了H2O2和Na2S2O8两种氧化剂对沉钒效果的影响，并通过实验确定了最佳工艺条件。结果表明：以H2O2为氧化剂时，H2O2与钒摩尔比为0.75、氧化温度为60℃、初始溶液pH为2.0、氧化时间为60min、水解温度为95℃、水解时间为2.5h的条件下可得到84.2%的沉钒率；以Na2S2O8为氧化剂时，Na2S2O8与钒摩尔比为0.65、氧化温度为90℃、氧化时间为45min、沉钒初始溶液pH为2.5、沉钒温度为90℃、沉钒时间为2.5h的条件下可获得93.1%的沉钒率。过硫酸钠氧化过程温和，沉钒率高，铬损失小，更适合工业推广应用。采用SEM获得了沉淀产物的微观形貌，煅烧后得到V2O5产品，采用XRF获得了产品组成，通过X射线衍射确定得到的V2O5产品为正交晶型。 |
| 关 键 词： | 钒铬还原渣 钒铬分离 氧化沉钒 沉钒率 铬损率 |
| 收稿时间： | 2020-08-26 |
Preliminary separation process of vanadium and chromium in acid leaching solution of vanadium chromium reduction slag |
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| DENG Xiaobo,WEI Linsen,SHEN Changshuai,LI Qianwen,WANG Chao,FAN Bingqiang,ZHANG Hedong,ZHANG Yang.Preliminary separation process of vanadium and chromium in acid leaching solution of vanadium chromium reduction slag[J].Chemical Industry and Engineering Progress,2021,40(7):4100-4107. | |
| Authors: | DENG Xiaobo WEI Linsen SHEN Changshuai LI Qianwen WANG Chao FAN Bingqiang ZHANG Hedong ZHANG Yang |
| Affiliation: | 1.Pangang Group Vanadium and Titanium Resources Company Limited, Panzhihua 617023, Sichuan, China 2.Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, Henan, China 3.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
| Abstract: | Vanadium chromium reduction slag is a typical hazardous solid waste, which produced from vanadium extraction by sodium roasting, and its resource-oriented utilization is in urgent need. A technical route of separation of vanadium and chromium from vanadium and chromium reduction slag have been proposed by Institute of Process Engineering, Chinese Academy of Sciences via sulfuric acid hydrolysis-preliminary separation of vanadium and chromium-depth separation of chromium/vanadium/iron by complexation, and a 10000-tons demonstration project was built in Pangang Group. The primary principle and process of vanadium/chromium separation in the acidolysis solution of vanadium chromium reduction slag was mainly investigated in this paper. The effect of H2O2 and Na2S2O8 on vanadium precipitation was studied, the optimal conditions were determined by experiments. The results showed that when H2O2 was used as oxidant, the n(H2O2)/n(V) was 0.75, the oxidation temperature was 60℃, the initial pH of the solution was 2.0, the oxidation time was 60min, the hydrolysis temperature was 95℃, and the hydrolysis time was 2.5h, the precipitation rate of vanadium reached 84.2%. Meanwhile, when Na2S2O8 was used as oxidant, the n(Na2S2O8)/n(V) was 0.65, the oxidation temperature was 90℃, the oxidation time was 45min, the initial pH of vanadium precipitation was 2.5, the vanadium precipitation temperature was 90℃, and the vanadium precipitation time was 2.5h, the precipitation rate of vanadium reached 93.1%. The results showed that sodium persulfate was more suitable for industrial application due to its mild oxidation process, high vanadium precipitation rate and small chromium loss. The microstructure of precipitated product was obtained by SEM. The V2O5 product that obtained after calcination was determined to be orthorhombic by X-ray diffraction. |
| Keywords: | vanadium chromium reduction slag separation of vanadium and chromium precipitation of vanadium by oxidation vanadium precipitation rate chromium loss rate |
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