Non-ferrous slags

Non-ferrous slags are by-products in the smelting of non-ferrous metals. Vitrified non-ferrous slags, such as copper and nickel slags, exhibit weak pozzolanic properties, and their blends with Portland cements may be used as binders of inferior cementing value. 

VERBA-XRF eoneeption effieieney shows itself in numeral methods analyzing ferrous alloys and powder-like materials like raw materials for eement industry, slag, eleetrolysis preeipitations in non-ferrous metallurgy. 

The silicate slag systems are involved in most pyro-metallurgical processes which result in the formation of a number of ferrous and non-ferrous metals (Cu, Ag, Zn, Cd Sn, Pb, Sb, Bi). These systems are oxide- and sulfide-oxide melts, and, therefore, the processes of their interaction with raw materials are dependent on the melt properties (oxidation ability, solubility of metals), and on their oxoacidic properties. Any metallurgical slag contains MgO, CaO, FeO and Si02 as one of main components. The oxidation ability of the slags increases with a rise of their basicity (increase of equilibrium O2-concentration), caused by the following electrochemical process ... 

Batch and straight or circular, and occasionally differently shaped continuous sintering plants are being used not only for iron ores but also for non-ferrous ores and lately are applied also for the treatment of metal bearing fines, such as flue dusts, mill scale, and ground slags, for recirculation (Section 8.2). 

The proportion of non-ferrous blast furnace slag is limited to 15 %. 

W. Curlook, V.G. Papangelakis, "Pressure and Leaching of Non-Ferrous Smelter Slags for the Recovery of their Base Metal Values," Pressure Hydrometallurgy 2004, Collins, Papangelakis Ed., CIM, Montreal 2004, 823-837. 

Non-ferrous metal smelting wastes up to 5% soils 1 - 750mgkg CdS in ZnS, ZnCOs slag (leaches slowly), soils... 

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