<報文>黒鉱系銅精鉱の溶錬産出物に関する研究(第2報) : スラグ, マット中の硫化物相について

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Sulfide particles observed in the solidified copper slag are caused by both mechanically entrained and chemically dissolved sulfides in the molten slag. The microscopicstructure of suspended white metal in the converter slag which was gradually cooled is illustrated in Photo 1. The following crystallites are recognized : 1) Bluish-grey matrix containing high copper content-Cu_2S solid solution ; 2) Bluish-purple copper sulfide phase-bornite solid solution which is separated from copper sulfide solid solution by miscibility gap (see Fig.1) ; 3) Small alloy phase containing antimony and nickel, exhibiting similar color to metallic copper ; 4) White crystallite having such shape as linear or chain type-PbS ; 5) Dark-bluish-grey crystallite-ZnS. The results of EPMA analysis of the above crystallites are shown in Table 1. The microscopicstructure of the sulfide particles separated from the converter slag during the solidification is shown in Photo 2. These particles have been found and reported in our preceding paper (see its Photos 2 and 3). It is consisting of eutectic structure of Cu_2S and PbS (see Fig.2). Two kinds of sulfide particles separated from the flash smelting furnace slag have been reported and illustrated in our preceding paper (see its 4 and 5 of Table 2). Besides these sulfide particles originated to dissolved copper and zinc in the slag, mechanically entrained sulfide particles are often observed in the slag, and, as an example, the microscopicstructure of such complex sulfide particles is shown in Photo 4. The following crystallites are recognized and the results of EPMA analysis given in Table 2 : i) Reddish-purple homogeneous phase-bornite solid solution ; ii) Yellow homogeneous phase-chalcopyrite solid solution ; iii) Greyish-blue leaf-like crystallite-ZnS-FeS solid solution ; iv) Fine eutectic crystals consisting of bornite and white lead sulfide. It should be noticed that such structure is different substantially from that of the matte, and it seems to be molten material of complex copper concentrate itself. Photo 5 shows the microscopicstructure of the matte taken out of a flash furnace, and the following phases having the compositions shown in Table 3 are recognized : a) Light-blue matrix-bornite solid solution ; b) Yellow pyrrhotite solid solution ; c) Angular crystallite-magnetite ; d) Scattered small light-grey round crystallite-wustite ; e) Dark-grey fayalite-minor in amount ; f) Light-greyish crystallite contiguous to pyrrhotite-ZnS-FeS solid solution (see Fig.3) ; g) White metallic ultra fine crystallite containing lead. As have been clarified in our previous reports, a considerable amount of iron oxide and even silica of a small amount can be dissolved in the molten matte. Accordingly, the phases a) through e) above are common constitutents in the copper matte. Although zinc in the matte crystallizes as the solid solution of ZnS-FeS, most lead seems to be separated as the metallic form and sometimes containing antimony, arsenic, nickel and other metals.
東北大学の論文
1974-03-28

<報文>黒鉱系銅精鉱の溶錬産出物に関する研究(第2報) : スラグ, マット中の硫化物相について

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