Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration
Rapid and accurate determination of total iron content in iron ore is crucial for mineral processing research and improving iron-making efficiency. Iron ore needs to undergo beneficiation treatment before iron-making. Solid reducing agents, such as coal and brown coal, are commonly used in magnetic...
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| Format: | Article |
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Science Press, PR China
2025-05-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/article/doi/10.15898/j.ykcs.202412030250 |
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| author | Shiyuan REN Yunfeng WANG Chunying GAO Nan WANG Lin WANG Zaizheng DONG |
| author_facet | Shiyuan REN Yunfeng WANG Chunying GAO Nan WANG Lin WANG Zaizheng DONG |
| author_sort | Shiyuan REN |
| collection | DOAJ |
| description | Rapid and accurate determination of total iron content in iron ore is crucial for mineral processing research and improving iron-making efficiency. Iron ore needs to undergo beneficiation treatment before iron-making. Solid reducing agents, such as coal and brown coal, are commonly used in magnetic separation technology. However, the high carbon component in iron ore samples is difficult to completely remove during the dissolution process, resulting in cloudy or even black solutions. When SnCl2, TiCl3 reduction and potassium dichromate titration are used to determine total iron in iron ore containing solid reducing agents, direct determination of total iron becomes impossible. Although the traditional method of roasting to remove carbon before analysis can be used to determine the total iron content in iron ore, this method has large errors, a long analysis cycle (2−4h), and high energy consumption. A method is proposed here for removing carbon from the sample by adding perchloric acid during the dissolution process of sulfur phosphorus mixed acid, which has achieved good results. Through conditional experiments, the optimal condition for carbon removal was determined to be the drop-wise addition of perchloric acid when sulfuric acid smoke just left the liquid surface. This method was used to determine samples prepared from iron ore standard samples and bituminous coal standard samples in different proportions, with relative standard deviation (RSD) of 0.07%−0.43%, and relative error of 0.10%−0.28%. For samples prepared with solid reducing agents of lignite, coke, anthracite, and graphite in a 1∶1 ratio with iron ore standard samples, this method had good decarbonization effects, with RSD of 0.25%−0.33%, and relative error of 0.04%−0.19%. Using this method and the traditional method to determine actual samples with different carbon contents, the RSD ranged from 0.08%−0.40% and 0.14%−0.68%, respectively, and the analysis times for a single sample were 30min and 2−4h, respectively. Compared with the traditional roasting method, this method eliminates the step of removing carbon from roasted samples. It reduces the error of analysis results, improves work efficiency and reduces energy consumption with its simple operation process. |
| format | Article |
| id | doaj-art-b636538a2c3d4ea78d64faadcd36aa5d |
| institution | OA Journals |
| issn | 0254-5357 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Science Press, PR China |
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| series | Yankuang ceshi |
| spelling | doaj-art-b636538a2c3d4ea78d64faadcd36aa5d2025-08-20T02:31:27ZengScience Press, PR ChinaYankuang ceshi0254-53572025-05-0144348849310.15898/j.ykcs.202412030250yk202412030250Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate TitrationShiyuan REN0Yunfeng WANG1Chunying GAO2Nan WANG3Lin WANG4Zaizheng DONG5Analysis and Testing Center, Northeastern University, Shenyang 110819, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaAnalysis and Testing Center, Northeastern University, Shenyang 110819, ChinaAnalysis and Testing Center, Northeastern University, Shenyang 110819, ChinaAnalysis and Testing Center, Northeastern University, Shenyang 110819, ChinaDepartment of Mineral Engineering, School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, ChinaRapid and accurate determination of total iron content in iron ore is crucial for mineral processing research and improving iron-making efficiency. Iron ore needs to undergo beneficiation treatment before iron-making. Solid reducing agents, such as coal and brown coal, are commonly used in magnetic separation technology. However, the high carbon component in iron ore samples is difficult to completely remove during the dissolution process, resulting in cloudy or even black solutions. When SnCl2, TiCl3 reduction and potassium dichromate titration are used to determine total iron in iron ore containing solid reducing agents, direct determination of total iron becomes impossible. Although the traditional method of roasting to remove carbon before analysis can be used to determine the total iron content in iron ore, this method has large errors, a long analysis cycle (2−4h), and high energy consumption. A method is proposed here for removing carbon from the sample by adding perchloric acid during the dissolution process of sulfur phosphorus mixed acid, which has achieved good results. Through conditional experiments, the optimal condition for carbon removal was determined to be the drop-wise addition of perchloric acid when sulfuric acid smoke just left the liquid surface. This method was used to determine samples prepared from iron ore standard samples and bituminous coal standard samples in different proportions, with relative standard deviation (RSD) of 0.07%−0.43%, and relative error of 0.10%−0.28%. For samples prepared with solid reducing agents of lignite, coke, anthracite, and graphite in a 1∶1 ratio with iron ore standard samples, this method had good decarbonization effects, with RSD of 0.25%−0.33%, and relative error of 0.04%−0.19%. Using this method and the traditional method to determine actual samples with different carbon contents, the RSD ranged from 0.08%−0.40% and 0.14%−0.68%, respectively, and the analysis times for a single sample were 30min and 2−4h, respectively. Compared with the traditional roasting method, this method eliminates the step of removing carbon from roasted samples. It reduces the error of analysis results, improves work efficiency and reduces energy consumption with its simple operation process.http://www.ykcs.ac.cn/article/doi/10.15898/j.ykcs.202412030250potassium dichromate titrationiron oreremoving carbonperchloric acidsolid reducing agents |
| spellingShingle | Shiyuan REN Yunfeng WANG Chunying GAO Nan WANG Lin WANG Zaizheng DONG Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration Yankuang ceshi potassium dichromate titration iron ore removing carbon perchloric acid solid reducing agents |
| title | Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration |
| title_full | Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration |
| title_fullStr | Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration |
| title_full_unstemmed | Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration |
| title_short | Determination of Total Iron in Carbon-Containing Iron Ore by Perchloric Acid-Assisted Digestion and Potassium Dichromate Titration |
| title_sort | determination of total iron in carbon containing iron ore by perchloric acid assisted digestion and potassium dichromate titration |
| topic | potassium dichromate titration iron ore removing carbon perchloric acid solid reducing agents |
| url | http://www.ykcs.ac.cn/article/doi/10.15898/j.ykcs.202412030250 |
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