高品位低活性NMD的活化研究──Ⅲ产品ANMD的物理化学性能

A STUDY ON THE ACTIVATION OF NMD WITH HIGH MnO2 CONTENT AND LOW ACTIVITY ──Ⅲ. Physicochemical Performances of the Product

用锌离子吸附（ＺＩＡ）法、模拟电池放电实验、ＸＲＤ技术研究从高品位低活性天然二氧化锰（ＮＭＤ）制得的活化天然二氧化锰（ＡＮＭＤ）产品的比表面积、放电行为以及晶体结构等物理化学性能．实验结果表明，ＡＮＭＤ具有大的比表面积、高的放电活性，其晶型属于α－ＭｎＯ２．与ＮＭＤ相比，ＡＮＭＤ的比表面从ＮＭＤ的８．９ｍ２／ｇ提高到６０．１ｍ２／ｇ，放电容量在ＮＨ４Ｃｌ＋ＺｎＣｌ２介质中从ＮＭＤ的１４．０ｍＡ·ｈ提高到２３．２ｍＡ·ｈ，在ＫＯＨ介质中从ＮＭＤ的１６．０ｍＡ·ｈ提高到２９．１ｍＡ·ｈ．ＡＮＭＤ的放电性能接近电解二氧化锰（ＥＭＤ）的水平。

The present work is a part of an investigation on the preparation of activated natural manganese dioxide (ANMD) for Zn-MnO2 battery use from natural manganese dioxide ( NMD) with high MnO2 content and low activity. Some physicochemical performances of the product ANMD, such as crystalline, apparent area and battery discharging activity, are determined in this paper. Results show that, ANMD is α-MnO2, its discharging capacity is as good as that of EMD and 65.7% in NH4Cl-ZnCl2, 82% in KOH higher than that of NMD, and its apparent area is 60.1 m2·g(-1) but that of NMD is only 8.9 m2·g(-1).