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首页> 外文期刊>Journal of Environmental Science and Health >Simultaneous stripping recovery of ammonia-nitrogen and precipitation of manganese from electrolytic manganese residue by air under calcium oxide assist
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Simultaneous stripping recovery of ammonia-nitrogen and precipitation of manganese from electrolytic manganese residue by air under calcium oxide assist

机译：氧化钙辅助空气同时汽提回收氨氮和从电解锰残留物中析出锰

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摘要

Leaching tests of electrolytic manganese residue (EMR) indicated that high contents of soluble manganese and ammonia-nitrogen posed a high environmental risk. This work reports the results of simultaneous stripping recovery of ammonia-nitrogen and precipitation of manganese by air under calcium oxide assist. The ammonia-nitrogen stripping rate increased with the dosage of CaO, the air flow rate and the temperature of EMR slurry. Stripped ammonia-nitrogen was absorbed by a solution of sulfuric acid and formed soluble (NH4)(2)SO4 and (NH4)(3)H(SO4)(3). The major parameters that effected soluble manganese precipitation were the dosage of added CaO and the slurry temperature. Considering these two aspects, the efficient operation conditions should be conducted with 8wt.% added CaO, 60 degrees C, 800mL min(-1) air flow rate and 60-min reaction time. Under these conditions 99.99% of the soluble manganese was precipitated as Mn3O4, which was confirmed by XRD and SEM-EDS analyses. In addition, the stripping rate of ammonia-nitrogen was 99.73%. Leaching tests showed the leached toxic substances concentrations of the treated EMR met the integrated wastewater discharge standard of China (GB8978-1996).
机译：电解锰残留物（EMR）的浸出试验表明，高含量的可溶性锰和氨氮构成了很高的环境风险。这项工作报告了在氧化钙辅助下同时汽提回收氨氮和空气中锰沉淀的结果。氨氮汽提率随CaO用量，空气流量和EMR浆料温度的增加而增加。汽提的氨氮被硫酸溶液吸收，形成可溶的（NH4）（2）SO4和（NH4）（3）H（SO4）（3）。影响可溶性锰沉淀的主要参数是加入的CaO的用量和浆液温度。考虑到这两个方面，应在添加8wt。％的CaO，60°C，800mL min（-1）空气流速和60分钟的反应时间的条件下进行有效的操作。在这些条件下，99.99％的可溶性锰以Mn3O4的形式沉淀，这通过XRD和SEM-EDS分析得到了证实。另外，氨氮的汽提率为99.73％。浸出试验表明，经处理的EMR浸出的有毒物质浓度符合中国综合废水排放标准（GB8978-1996）。

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