Method for recycling mercury from waste and old neutral zinc-manganese dioxide battery

Abstract

The invention discloses a method for recycling mercury from a waste and old neutral zinc-manganese dioxide battery. The method comprises the following steps: taking out a cathodic zinc skin of a waste and old neutral zinc-manganese dioxide battery, then placing anodic substances and electrolyte of the waste and old neutral zinc-manganese dioxide battery into water, stirring to ensure that the anodic substances and the electrolyte are dispersed, adjusting the pH value to 1-6 with acid, sufficiently soaking and stirring to enable the electrolyte and mercury compounds in the waste and old neutral zinc-manganese dioxide battery to be dissolved in the water, filtering undissolved substances, and recycling; repeatedly using the filtrate to soak the anodic substances and the electrolyte, placingthe cathodic zinc skin into the filtrate when the concentration of the zinc ions in the filtrate reaches the weight percent of 0.1-10%, and stirring to enable the cathodic zinc skin to sufficiently contact the filtrate, thus enabling the mercury ions to replace zinc and generating zinc amalgam; when the mercury ions react completely, taking out the amalgamated zinc skin from the filtrate, and electrolyzing by taking the amalgamated zinc skin as an anode and taking the filtrate as the electrolyte; and when the zinc on the anode is dissolved and the metallic mercury is peeled off below the anode in the electrolyzing process, collecting the fallen metallic mercury, thus finishing the recycle of the mercury.

Description

Technical field [0001] The invention belongs to the technical field of waste battery recovery, and particularly relates to a method for recovering mercury from waste neutral zinc-manganese batteries. Background technique [0002] my country is a major producer and consumer of zinc-manganese batteries. At present, although alkaline zinc-manganese batteries have been mercury-free, there are still mercury in neutral zinc-manganese batteries that are widely used. Both mercury and mercury compounds are toxic. Mercury has obvious neurotoxicity and can cause serious harm to the endocrine system and immune system of humans and animals. Moreover, the biological toxicity of mercury is non-degradable and accumulative, and once it enters the soil or water body, it is difficult to fundamentally eliminate it. If the mercury in the used zinc-manganese battery is not recycled, it will inevitably undergo a process of being released from the battery into the environment, and then migrated, abso...

AI Technical Summary

Problems solved by technology

Patent Application No. 01113130.6 for "Method for Removing and Recycling Mercury from Waste Batteries", Patent Application No. 200710010767.2 for "Dry Distillation Separation Device and Separation Method for Waste Zinc-Manganese Dry Batteries" and Patent Application No. 200410041889.4 for "Manganese Production from Waste Dry Batteries Zinc Ferrite Method", Patent No. ZL200510033231.3 "Method for Recycling and Treating Mixed Waste Batteries and Its Special Roasting Furnace", Patent No. ZL01248064.9 "Waste Battery Treatment Device" and Patent No. ZL00127829.0 The "Comprehensive Recycling and Utilization Method of Mercury-Containing Waste Batteries" and other technologies all use the characteristics of easy sublimation of mercury and its compounds to recycle them, but these methods have the disadvantages of high investment and