TECHNOLOGY AND PRACTICE OF RECYCLING LEAD,SILVER AND ZINC IN LARGE-VOLUME MANGANESE-RICH SLAG FURNACE
With the continuous innovation of the production process of ferromanganese-silicon,the maturity of blast furnace smelting technology for manganese-rich slag,and the gradual elimination of rudimentary equipment,the furnace capacity has gradually expanded from the initial 5 m3 to the current maximum 450 m3,and the furnace roof equipment has gradually transitioned from the initial simple manual single bell type to the current fully automatic bell-valve type and bell-less environmental protection high-pressure type.However,with the improvement of the equipment and the restrictions of environmental protection and energy-saving industry policies,the technology of smelting manganese-rich slag in blast furnaces has deviated from the original process route and is only limited to mainly processing foreign iron-rich poor manganese ore(such as South African,Indian,Australia,etc.).For most of the domestic and foreign manganese ore resources containing lead,silver,and zinc that need to be enriched and recovered,they cannot be further effectively recovered and utilized.The reason is that the process technology for recovering lead,silver,and zinc from manganese-rich slag furnaces with a capacity of over 100 m3 is not mature,resulting in the operation and maintenance costs of the manganese-rich slag furnace far exceeding the economic benefits obtained from recovering lead and silver.Based on the smelting practice and process technology of 128 m3 and 350 m3 manganese-rich slag furnaces for recovering lead,silver,and zinc in Ningxia Shengyan Company,this article conducts a process analysis from the design and mason-ry of lead and silver channel at the furnace bottom,the adjustment of entering furnace structure,and the improvement of the operating process system.
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维普
