| 摘要 |
The useful method refers to a process line for lead and lead alloys production from a wide range of raw materials and scrap in various ratios. The line as per the present model includes in-line a processing unit (1) to collect and store lead containing and slag material linked through conveying belts to a batch preparation hopper (2). The system (2) is connected by a feeding device to a furnace (3) which is connected also to a hard reductor feeding system for reducing lead slag and operating in two repeating modes for oxidation melting and slag reducing. The top of the furnace (3) is connected to a utilizing tank with a radiation surface (9) to cool gases, to partially precipitate dust and cake and to utilize heat as steam. The furnace is connected also by a flue to a wet scrubbing system (10) to fully scrub gases from dust down to 1 mg/nm3. The wet scrubbing system (10) is linked to a sulphuric acid installation (11) to scrub sulphur dioxide, and installation (11) is connected to a flue gas scrubber (12) for additional fine scrubbing of sulphur gases containing sulphur dioxide in concentrations less than 400 mg/nm3 and it is connected to a stack to exhaust them in the atmosphere. The lead bullion outlet at the bottom of the furnace (3) is connected by a furrow to a casting installation to cast lead bullion into blocks of 4-5 t. The casting installation is connected by conveyors to a system of refining kettles (4,4a) to consequently remove copper, tellurium, arsenic and antimony, silver, zinc, bismuth, calcium and magnesium and producing a 99,99% pure lead free from impurities. Kettles are linked by a pump and a furrow to a casting installation (5) ingot casting or alloying to a specific alloy. The outlet for slag tapping during the second mode of operation of the furnace (3) is connected by a granulating furrow to block (6) for additional refining of lead slag to less than 0,2% lead content and less than 2% zinc content in the residual slag. It is also connected
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