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Basing upon the results of the commercialization tests on copper smelting by converter using oxygenenriched air, proviously published, (refer Note 1), the project for putting this process into commercial practice was commenced at the Hitachi Mine in September 1956 and completed in April 1958. Thereafter, the operation of this process has been continuing in smooth performance. The construction program may be summarized as follows:(1) Four of the existing converters were put into use after modifications and improvements. (2) Wet blending is employed as a preliminary treatment for the converter feed ore which after pelletizing in a balling drum is dried to a moisture content of about 3%. (3) Of the existing ten blast furnaces, seven were scrapped and only three preserved, of which one Is being utilized as an auxiliary unit. (4) The oxygen producing plant is an air-separation unit with a capacity to produce 2,000 cubic metres per hour of oxygen of 95% purity. The oxygen is stored in a-storage tank capable of ,holding 2,000 cubic' metres of oxygen. This is compressed by oxygen compressor and then automatically blended with air to the required oxygen density. (5) The converter slag is treated by the ordinary ore dressing process, for which purpose a slag dressing plant with a capacity for treating 5,000 tons of slag per month was installed. (6) The No. 1 Sulfuric Acid Plant was expanded from its original production capacity of 3,000 tons per month to 4,500 tons per month by the addition of a gas flue of about 750 metres long from converter aisle with a• washing tower in between, a drying tower, absorption tower and cooling units. (7) The No. 2 Sulfuric Acid Plant was also expanded from its original production capacity of 3,000 tons per month to 7,000 tons per month by the addition of a drying tower, absorption tower, converting units and cooling units. Furthermore, with a view to treating the converter gas, cottrell precipitators wore added . 1n place of the Herresh off roasters,afluidized bed roaster of 80 tons per day capacity was newly installed . The surplus heat is recovered as steam for utilization at the refinery to which it is piped over a considerably long distance of 3,500 meters. (8) Improvements and modifications were made to all auxiliary installations to cope with the above. 1)T. Tsurumoto: Investigation of Copper smelting by using oxygen-erlrich Air. Journal of the Mining and Metallurgical Institute of Japan, Vol.75, No.858, p.27.

Smelting of Copper Ores and Concentrates by Converter using Oxygen-Enriched Air at Hitachi Mine