Abstract: In order to recycle the valuable metals in the copper slag， the analysis methods， such as XRF， XRD， SEM， EDS and BPMA， were used to study process mineralogy of the bottom blowing smelting copper slag. The main composition of smelting slag， main minerals components， copper phase occurrence state were found out. The embedded characteristics， disseminated granularity and dissociation degree of the important mineral phases in the slag were studied. The results showed that: ① The main valueable metal in the smelting slag are Cu， Fe， Pb and Zn， and the impurity components is mainly SiO2. ② The main minerals in the smelting slag are matte， iron olivine， ferrite and glass phase. The main copper-bearing minerals are matte， metallic copper， chalcopyrite and copper oxide， and the contents of matte is the highest， with the distribution rate of 92.69%. ③ The distribution of particle size of matte in the smelting slag is not uniform， mainly in the form of granule or round point distribution in the slag， which is closely related to the distribution of lead sulfide， iron olivine， glass phase and ferrite. ④ The metal copper is mainly long granular and round granular， and most of the produced copper was wrapped or connected by ferrite， iron olivine and glass phase. ⑤ Ferrite is lobate matted crystal after amplification. Ferrite is closely related to metal copper and matte and is closely associated with iron olivine and other sulfide ores. ⑥ Iron olivine is closely related to metal copper and matte， wrapping or aggregating the ferrite phase， which formed the base phase of molten slag. ⑦ The glass phase is filled between ferrite， iron olivine， metal copper and matte， take the role of the adhensive. ⑧ The monomer dissociation degrees of metal copper and matte are low， which are 46.13% and 33.81%， respectively， and mainly distributed in the range of 0.020 and 0.038 mm. Therefore， it's important to paid attention to the recovery of fine matte and metal copper when recycle the coarse matte and metal copper.

Key words: bottom blowing smelting slag, process mineralogy, disseminated characteristic, degree of dissociation