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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.2, Oct 19-23, 2002, Montreal, Quebec, Canada >Pyrohydrolysis of a Calcium and Magnesium Bearing FeCl_2 Leach Liquor
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Pyrohydrolysis of a Calcium and Magnesium Bearing FeCl_2 Leach Liquor

机译：含钙和镁的FeCl_2浸出液的热解

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The leaching of titanium slag to enrich feedstock for the pigment industry leads to the production of spent liquor rich in iron chloride, similar to that produced by the ilmenite leaching or steel pickling plants, but containing higher concentrations of impurities, such as MgCl_2 or CaCl_2. Since 1998, QIT uses a pyrohydrolysis regeneration process similar to that used by the steel industry to regenerate the waste solution. Typical spent acid composition obtained by QIT is compared to that produced by the steel pickling industry. Fundamental thermodynamics explain the impact of MgCl_2 or CaCl_2 on the FeCl_2 regeneration as experienced by QIT in their full-scale regeneration plant. MgCL-2 and CaCl_2 are found to be more stable than FeCl_2, and require higher reaction temperature to be converted into oxides. Analysis of solid build-up collected in QIT plant reactors was performed and showed that when the reaction temperature is insufficient, unconverted molten MgCl_2 or CaCl_2 can collect on equipment walls and in piping, and form a hard sinter with reactor dust. To ensure satisfactory conversion of metal chlorides, plant operation at QIT showed that pyrohydrolysis temperature must be higher than that generally used in the pickle liquor regeneration process. Oxide product has a lower density than usual iron oxide and higher solids carryover from the pyrohydrolyser are observed. Finally, recycling applications of iron oxide product containing Ca and Mg are limited. Consequently, limited pyrohydrolysis utilisation is obtained and the regeneration of calcium and magnesium bearing FeCl_2 leach liquor requires different, more sophisticated approaches to deal with the additional challenges, when compared to the pyrohydrolysis of simpler leach liquor as is generated by the steel industry. Such approaches involve modifications to equipment design and to operating conditions.
机译：钛渣的浸提以丰富颜料工业的原料，导致产生了富含氯化铁的废液，类似于钛铁矿浸出或钢酸洗厂所产生的废液，但含有较高浓度的杂质，例如MgCl_2或CaCl_2。自1998年以来，QIT使用的热水解再生工艺与钢铁行业的再生工艺类似。将QIT获得的典型废酸成分与钢酸洗行业产生的废酸成分进行比较。基本的热力学解释了QIT在其大规模再生装置中所经历的MgCl_2或CaCl_2对FeCl_2再生的影响。发现MgCL-2和CaCl_2比FeCl_2更稳定，并且需要更高的反应温度才能转化为氧化物。对在QIT工厂反应堆中收集到的固体堆积物进行了分析，结果表明，当反应温度不足时，未转化的熔融MgCl_2或CaCl_2会聚集在设备壁和管道中，并与反应堆粉尘一起形成坚硬的烧结体。为确保金属氯化物的令人满意的转化，QIT的工厂运行表明热解温度必须高于腌制液再生过程中通常使用的温度。氧化物产物的密度低于通常的氧化铁，并且观察到来自热解器的较高的固体残留。最后，含Ca和Mg的氧化铁产物的再循环应用受到限制。因此，与钢铁行业产生的较简单的浸出液进行热水解相比，获得的热解利用有限，并且含钙和镁的FeCl_2浸出液的再生需要不同，更复杂的方法来应对其他挑战。这样的方法涉及对设备设计和操作条件的修改。

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