玉米秆还原浸出电解锰阳极泥制备化学二氧化锰研究
发布时间：2018-07-29 16:07
【摘要】：电解锰阳极泥因其组成成分复杂,化学活性低,长久以来难以直接回收利用。玉米秆可作为一种成本低廉,来源广泛的有机还原剂,通过还原浸出电解锰阳极泥来制备化学二氧化锰,实现废弃资源的二次回收和再利用。本文系统研究了整个制备工艺过程的各个环节,探索了各阶段相关工艺参数对最终产品化学二氧化锰质量的影响。结合有关理论分析,研究各环节工艺发展方向,并通过试验验证,得到用玉米秆还原浸出电解锰阳极泥制备化学二氧化锰的最佳工艺参数。对比用贫菱锰矿合成制备的化学二氧化锰产品,了解两种方法生产的最终CMD产品性能差异。碳酸锰热解法是一种常用的制备化学二氧化锰工艺方法。其过程可分为四个阶段,分别是硫酸锰溶液的制备、碳化结晶、初级二氧化锰制备和产品精制。硫酸锰溶液的制备包括玉米秆还原浸出和浸出液除杂两个阶段,其分别决定了电解锰阳极泥的回收利用率和最终产品的纯度。碳化结晶部分的各种工艺条件对碳酸锰视密度的影响明显,进而影响最终的化学二氧化锰视密度,但对产品的电活性影响较小。合理安排碳酸氢铵用量、给药方式、结晶温度和时间可获得视密度为2.1g/cm3的碳酸锰产品。初级二氧化锰制备部分,时间和温度决定了热解效率和产物晶型,结果表明,在380℃下热解6h后所得产物Mn02含量为68.96%以γ-MnO2为主,电化学活性最高。产品精制部分,对初级二氧化锰酸处理和氧化后能进一步提纯并可改善颗粒形貌,提高视密度。本研究在综合考虑了生产条件、经济成本等现实情况下,选择各阶段的最佳工艺参数进行试验,最终获得MnO2含量达91.29%,视密度为1.83g/cm3,电容量为251.6mAh的化学二氧化锰产品。用贫菱锰矿制备的化学二氧化锰产品,其MnO2含量达91%,视密度为1.90g/cm3,电容量为249.43mAh。由此可见,两者在视密度及电活性方面效果大致相同,均可达到优质化学二氧化锰的水平。
[Abstract]:Electrolytic manganese anode mud is difficult to be directly recovered for a long time because of its complex composition and low chemical activity. Cornstalk can be used as an organic reductant with low cost and wide source. Chemical manganese dioxide can be prepared by reducing and leaching electrolytic manganese anode mud to realize the secondary recovery and reuse of waste resources. In this paper, every link of the whole preparation process is systematically studied, and the influence of the relevant process parameters on the quality of the final product chemical manganese dioxide is explored. Based on the theoretical analysis, the development direction of each process was studied, and the optimum technological parameters for the preparation of chemical manganese dioxide from electrolytic manganese anode slime by cornstalk reduction leaching were obtained. Compared with the chemical manganese dioxide products synthesized from low rhodochromatic manganese ore, the difference of the properties of the final CMD products produced by the two methods was understood. Pyrolysis of manganese carbonate is a common process for preparing chemical manganese dioxide. The process can be divided into four stages: preparation of manganese sulfate solution, carbonation crystallization, preparation of primary manganese dioxide and purification of product. The preparation of manganese sulfate solution includes two stages of cornstalk reduction leaching and leaching solution impurity removal which determine the recovery efficiency of electrolytic manganese anode mud and the purity of the final product respectively. The effect of various processing conditions on the apparent density of manganese carbonate is obvious, and then the final apparent density of manganese dioxide is affected, but the effect on the electrical activity of the product is small. Manganese bicarbonate with apparent density of 2.1g/cm3 can be obtained by reasonably arranging the amount of ammonium bicarbonate, the way of administration, the crystallization temperature and time. In the preparation of primary manganese dioxide, the pyrolysis efficiency and crystal form of the product are determined by time and temperature. The results show that the Mn02 content of the product is 68.96% after pyrolysis at 380 鈩，
本文编号：2153208
[Abstract]:Electrolytic manganese anode mud is difficult to be directly recovered for a long time because of its complex composition and low chemical activity. Cornstalk can be used as an organic reductant with low cost and wide source. Chemical manganese dioxide can be prepared by reducing and leaching electrolytic manganese anode mud to realize the secondary recovery and reuse of waste resources. In this paper, every link of the whole preparation process is systematically studied, and the influence of the relevant process parameters on the quality of the final product chemical manganese dioxide is explored. Based on the theoretical analysis, the development direction of each process was studied, and the optimum technological parameters for the preparation of chemical manganese dioxide from electrolytic manganese anode slime by cornstalk reduction leaching were obtained. Compared with the chemical manganese dioxide products synthesized from low rhodochromatic manganese ore, the difference of the properties of the final CMD products produced by the two methods was understood. Pyrolysis of manganese carbonate is a common process for preparing chemical manganese dioxide. The process can be divided into four stages: preparation of manganese sulfate solution, carbonation crystallization, preparation of primary manganese dioxide and purification of product. The preparation of manganese sulfate solution includes two stages of cornstalk reduction leaching and leaching solution impurity removal which determine the recovery efficiency of electrolytic manganese anode mud and the purity of the final product respectively. The effect of various processing conditions on the apparent density of manganese carbonate is obvious, and then the final apparent density of manganese dioxide is affected, but the effect on the electrical activity of the product is small. Manganese bicarbonate with apparent density of 2.1g/cm3 can be obtained by reasonably arranging the amount of ammonium bicarbonate, the way of administration, the crystallization temperature and time. In the preparation of primary manganese dioxide, the pyrolysis efficiency and crystal form of the product are determined by time and temperature. The results show that the Mn02 content of the product is 68.96% after pyrolysis at 380 鈩，
本文编号：2153208
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