紫鑛利用に關する一新研究
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The object of this research is to leach copper out of pyrite cinder and to utilize, at the same time, the residue as a superior raw material for pig manufacturing. In these experiments we used neutral ammonium-chloride solution as a leaching liquor. The experiments were unsuccessful for both the leaching of copper and the desulphurisation of the ore in the original states. We confirmed the fact that most of the copper in the original cinder are in the forms of ferrites, which are unable to leach with the use of ammonium-chloride solution For the purpose of separating the sulphuric and sulphurous compounds and SiO_2 from the iron oxides in the cinder, we first attempted to reduce the cinder by CO gas. After the reduction at a temperature from 450°to 500℃ for 30 minutes, we found that nearly 95% of the non-magnetic iron oxider in the cinder were changed in the magnetic form. By means of a magnetic separator, we could separate the sulphur compounds and SiO_2 from the magnetic part of the cinder-the concentrate being of Fe 67%, Cu 1∿2%, S 0.01∿1.5% and SiO_2 1∿2%. The concentrate contained more than 90% of the copper content in the original cinder, and these copper compounds could scarcely be leached by the above mentioned solution because of the formation of Cu_2O・Fe_3O_4, etc. But, if we oxidise again these concentrates at 550°∿600℃. for 30∿40 minutes under air current, most of the sulphur burns to SO_2 and the suephur content in the concentrates lowers to about 0.01∿0.50%, and moreover nearly 100% of the copper compounds change to the form easily leachable by the use of ammonium-chloride solution.
- 社団法人日本鉄鋼協会の論文
- 1937-09-25
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関連論文
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