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| Mineralogical Characteristics and Formation Mechanism of Scab Materials in High-Pressure Dissolution and Evaporation Process of Alumina Productions |
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Received:November 05, 2019
Revised:November 18, 2019
Accepted:November 18, 2019
Published Online:March 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.04.007 |
| KeyWord:alumina; scab; deposition mineral; characteristics; formation mechanism |
| Author | Institution |
| LIU Zi-yi |
贵州大学 材料与冶金学院 |
| HUANG Fang |
贵州理工学院 材料与冶金工程学院 |
| LIU Xue-jin |
贵州理工学院 材料与冶金工程学院 |
| LU Fang-hai |
贵州理工学院 材料与冶金工程学院 |
| JIN Hui-xin |
贵州大学 材料与冶金学院 |
| XU Chun |
贵州理工学院 材料与冶金工程学院 |
| CHEN Yu-dao |
贵州理工学院 材料与冶金工程学院 |
| LONG Wen-jie |
贵州理工学院 材料与冶金工程学院 |
| MA Hai-zhu |
贵阳铝镁设计研究院有限公司 |
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| Abstract: |
| Mineral characteristics, sedimentary structures and formation mechanism of scabs produced in high-pressure digestion and evaporation process were analyzed by X-ray diffraction(XRD), Backscatter electron(BSE) image and electronic energy spectrometer(EDS). The results show that scab formation could be divided into early and later sedimentation respectively. The scabs generated in high-pressure dissolution are chemical crystallization including coarse crystalline hematite, perovskite and goethite, which grew toward center along tubes walls and formed a large number of dense and coarse clusters growing as perpendicular to the wall. Then the solution captured between crystals recrystallized to form fine alumogoethite, sodium-silicon residue, magnesium hydroxide, calcium magnesium silica slag, hydrated garnet and peridot, and existed in form of intergranular interstitial material. Therefore, early deposition is the main scab process in high pressure dissolution process. Formation of scabs in evaporation process is physical deposition that occurs when a large number of crystallizable impurities are reduced. Firstly, loose and fluidity fine particles or aphanitic sodium carbonate and sodium-silicon residue substrates are formed by deposition, and then calcium iron titanate, iron garnet, sodium carbonate and other crystals are precipitated and form scab. Evaporation process is dominated by late deposition. |
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