El medio ambiente en la minería

127 T. KIMURA & H. KUROKAWA became increasingly stricter year byyear. Table 2 sbows tbe comparison of tbe environmental pollution regulations and tbe actual results at Toyo Smelter. Table2. Comparison of the environmental poIlution regulations tor emitted gas and the actual results at Toyo Smelter and Refinery .i~'" '; .... ; . <f~egUlatlve Valua Actual Reaults Regulated Procesa Gas Vol. Method SOx No,. S.S.* Gas Vol. SOx NOx S.S.* Nm 3 ¡H,:J, ppm ppm gJNm 3 Nm3/H ppm PP!ll gJNm 3 Conoentratlon Dryer 86,000 535 155 <0.15 65,000 130 50 0.03 te te te te 84,000 250 100 0.08 Acld Plant 170,000 60 112 <0.10 130,000 5 5 <0.01 te to te 160,000 15 20 Fugitlve 330,000 50 - .<0.20 250,000 1 - <0.02 Gas , 10 to . 300,000 10 Total Volume TheWhole 80 Nm 3 /H 10 te 25 Nm 3 /H 01 the emitted Toyo Smelter SOx and Refinery "S.S.: suspended solid particles 11. RECENT OPERATION RESULTS. OUTLINE OF TOYO SMELTER Figure 1 sbows tbe flow sheet and Table 4 indicates tbe main equipment at Toyo Smelter. Tbe production plant at Toyo Smelter and Refinery consists of a smelter, flotation plant, acid plant and refinery, and the refined anodes are distributed to both the Toyo Refinery and Niibama Copper Refinery which treats the anode sUmes as well as tbe anodes from Toyo.