Performance evaluation of cleaner production audit in electrolytic manganese industry

The development of the electrolytic manganese industry in China and the progress of its cleaner production audit were introduced. Through several rounds of cleaner production audit in the electrolytic manganese industry, the major environmental pollution problems in the electrolytic manganese industry were diagnosed. The standardized management system was established in the industry, the development of cleaner production technologies promoted, and the environmental benefits and economic benefits of typical medium and high fee options analyzed. Combined with the cleaner production evaluation index system of the electrolytic manganese industry, the variation of key cleaner production indexes such as the replacement of toxic and hazardous substances, comprehensive energy consumption and current efficiency in the industry from 2009 to 2017 was analyzed. The results showed that the comprehensive energy consumption had decreased from 8 600 kW ·h/t (in Mn) in 2009 to 6 900 kW ·h/t currently, and the current efficiency had shown an overall upward trend. For a company that had undergone multiple rounds of cleaner production audit, five evaluation indexes such as electrolytic cell, stripping method, DC power consumption, harmless treatment of manganese slag, and synthesis utilization rate and water-soluble manganese content (dry basis) in manganese slag reached the domestic advanced level, and played a leading role in energy conservation and emission reduction of the industry.