<報文>都市廃棄物の処理と資源化に関する基礎研究(IV) : 亜鉛, マンガンおよび水銀のアルカリ乾電池からの回収

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The use of primary batteries such as manganese and alkaline-manganese dry cells has become very popular for cordless electronic devices and production of those batteries amounts to several billion a year. The convenience of batteries for modern life has brought the serious soil and air pollution problems through the use of mercury which serves an essential function at zinc cathode on discharge. In order to overcome this mercury pollution problem, we propose several processes from the viewpoint of mineral dressing and metallurgy to treat those batteries as urban minerals which contain sufficient amounts of zinc and manganese after removal of mercury. The merits and demerits of battery treatments in zinc refinery by means of hydro- and/or pyrometallurgical methods are discussed basing on the experimental results of the behaviours of batteries on heating in air and on leaching in acid and alkaline solutions. From the results, the difficulties of the treatments of batteries at the zinc refinery become clear as follows : 1) Batteries are difficult to crush because of their multilayered structure and they cannot be broken down into components easily. 2) Acid and alkaline teachings are also difficult due to the resistance of the nickel-plated steel container without crushing. 3) The removal of impurities originating from the battery, such as Mn, Co, Ni and Hg, requires many additional complicated processes for purification of zinc electrolyte. 4) Pyrometallurgical treatment for evaporating mercury in a multi-hearth roaster is found to be very effective and then it seems most probable to produce ferroalloy and zinc dust by carbon reduction at high temperature. In conclusion, the separation of waste batteries to each components is essential for recycling zinc and manganese at each refinery and mercury should be removed as a vapor on heating and immobilized as insoluble mercury compounds such as Hg_2Cl_2.MercuryAlkaline manganese batteryResourceZincManganeseThermal analysisWaste batteryUrban mineral
東北大学の論文
1985-09-30

<報文>都市廃棄物の処理と資源化に関する基礎研究(IV) : 亜鉛, マンガンおよび水銀のアルカリ乾電池からの回収

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