Effect of different dopants on the carbothermal reduction of phosphate rock

doi:10.16085/j.issn.1000-6613.2020-0350

Abstract

Abstract:

The carbon thermal reduction of phosphate rock with different dopants of K₂CO₃, Na₂CO₃, NiSO₄ and K₂CO₃-NiSO₄ were compared and analyzed. The results showed that the reaction progress of the systems with alkali metals doped was slightly better than that of other systems at 1200℃ because it was easier to produce liquid phase that was conducive to the diffusion. Comparing the XRD patterns at different temperatures of the doped system with those of the undoped system, we found that the dopant only strengthened the reaction progress, and no new substance was produced. There was also a significant difference in the flow temperature of the residue after doping. At 1250℃, the flow temperature of the residue with alkali metal dopants was relatively low, which decreased with the increase of the temperature. However, the flow temperature of the mixed doping system and the doped system with nickel sulfate was lower than that of the alkali metal system at 1350℃. From the SEM analysis of the residue at 1300℃, it can be seen that the appearance of the residue from the doped system was basically the same as that from the unadulterated system, indicating that the doping did not change the appearance of the residue, which was solid and met the solid slag discharge requirements of kiln phosphoric acid.

Key words: kiln process phosphoric acid, dopant, phosphate rock, carbothermal reduction

摘要：

对比分析了分别以K₂CO₃、Na₂CO₃、NiSO₄、K₂CO₃-NiSO₄为掺杂剂的不同磷矿碳热还原反应体系，结果表明，1200℃时，掺杂碱金属的体系由于其更易产生液相，利于扩散，因此，其反应进度比其他体系略好；对比掺杂物体系和无掺杂体系的各温度XRD图谱可知，掺杂物只是强化了反应的进度，并未有新的物质产生。添加掺杂物后残渣的流动温度也有明显差异，1250℃时，掺杂碱金属的残渣其流动温度较低，而随着温度的升高，残渣的流动温度均下降；但1350℃时，混合掺杂体系和掺杂硫酸镍体系的流动温度却低于碱金属体系；从1300℃下残渣的SEM图谱分析可知，具有掺杂物体系的残渣外观形态与无掺杂体系基本一致，说明添加掺杂物并没改变残渣的外观形态，均是固体残渣，符合窑法磷酸固态排渣的要求。

关键词: 窑法磷酸, 掺杂剂, 磷矿, 碳热还原

CLC Number:

TQ126.3

Guangya ZHENG, Renfei CAO, Jupei XIA, Yi MEI, Zhengjie CHEN. Effect of different dopants on the carbothermal reduction of phosphate rock[J]. Chemical Industry and Engineering Progress, 2020, 39(12): 5112-5118.

郑光亚, 曹任飞, 夏举佩, 梅毅, 陈正杰. 不同掺杂剂对磷矿碳热还原反应的影响[J]. 化工进展, 2020, 39(12): 5112-5118.

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