論文 Work Index and Physical Properties of Slags Produced in Non- f errous Metallurgical Processes* by Armando H. SHINOHARA1, Kazumasa SUGIYAMA2, Fumio SAITO3, Yoshio WASEDA4 and James M. TOGURI5 The slag samples from various non-ferrous metallurgical smelters have been characterized by determining Bond's work index, density and Vickers hardness coupled with X-ray powder diffraction and optical microscopic observation. Bond's work index for a slag consisting almost of glassy phase shows relatively higher index value than that of the crystalline slags and brittle minerals like quartz and feldspar, although a consistent index for zinc slag could not be obtained due to a large amount of co-existingmetallic phase. The following empirical equation for crystalline brittle materials has been developed to describe the correlation between work index; Wi [kWh/t] and the product of Mohs' hardness; HM and density; p [Mg/m3]. Wi=0.42(HM・ ρ)+6.56 This equation is suitable for the range up to 30•~103 in the values of HM•Ep with corresponding correlation coefficient of 0.83. Using this equation, the work index for the brittle portion of zinc slag, which is mainly constituted of oxide and silicate minerals, was estimated to be 16 kWh/t. KEY WORDS: Non-ferrous Metallurgical Slags, Work Index, Vickers Hardness, Mohs' Hardness,- X-ray Diffraction 1. Introduction Recently, the awareness of the necessity to preserve the environment and to conserve our limited natural resources has led to an increasing requirement for recycling industrial wastes to useful products. In this context, slag produced in a steel making process is now utilized as a raw material for Portland cement clinker, thermal or acoustic insulation, road construction, etc1). Slags produced by non-ferrous metallurgi- cal processes are not widely used as ferrous metallurgical slags. In the near future, it is expected that non-ferrous metal- lurgical slags would be utilized for a wide range of useful products. For such purposes, it is necessary to determine the physical and chemical properties of these slags. However, very little information is available on this subject matter. Consequently, the main purpose of the present investiga- tion is to characterize eight types of non-ferrous metallurgical slags by determining their Bond's work indices2). An empirical equation which correlates the relationship between Bond's work index and the product of Mohs' hardness and density3) was tested and also discussed for these slags. 2. Samples and Experimental Procedures Zinc smelting slag of electrothermic distillation process (Zn-slag), two types of copper smelting slags of flash-smelting and converting processes (FS-Cu-slagand C-Cu-slag, respective- ly), electric furnace slag for lead recovery (Pb-slag), and ferro-nickel blast furnace slag (FeNi-slag) were provided from Nippon Mining Co., Ltd.. Zinc-lead blast furnace slag of ISP (ZnPb-slag) and magnesium slag of thermo-reduction process (Mg-slag)were supplied by Hachinohe Smelter Co., Ltd. and by Japan Metals & Chemicals Co., Ltd., respectively. Among them, FS-Cu-slag, FeNi-slag, ZnPb-slag and Mg-slag were produced by water quenching technique. Nine typical inor- ganic brittle materials; borosilicate glass (Pyrex), quartz, beryl, feldspar, spodumene, microcline, limestone, gypsum and talc were also used for comparison with some physical properties of the present slag samples. The chemical composi- tions of the slag samples are summarized in Table 1. The slag samples were dried in an oven at 380 K for 24 hours, and Bond's work index and physical properties were measured. The grain size of the as-quenched Zn-slag appears to depend strongly on the amount of co-existing metallic phase. For this reason, Zn-slag was classified into two groups, Table 1 Chemical composition of major elements of non-ferrous metallurgical slag samples used in the present study. *Received September 18 ,1991: accepted for publication April 3,1992 1～4. Institute for Advanced Materials Processing(SOZAIKEN), Tohoku University,A oba-ku, Sendai 980, Japan 5.Department of Metallurgy and Materials Sciences, University of Toronto, Canada 1. Visiting Scierltist, 2. Research Associate,Dr., 3. Professor,Dr., 4. Professor, Dr..5. Professor.PhD. 資源 ・素 材 学 会 誌108 (1992) No.7 525<15>