Method for extracting valuable elements from slag of melted high-iron high-silicon nonferrous metal

Abstract

The invention relates to a method for extracting valuable elements from slag of melted high-iron high-silicon nonferrous metal with fire to produce low-carbon low-sulfur molten iron and directly produce heat-resisting structural steel. The method for extracting valuable elements from slag of melted high-iron high-silicon nonferrous metal comprises the physical modification, the oxidation modification, the reduction and the magnetic separation of the slag of nonferrous metal, the proportion of the slag (the melting of the components) and the adjustment of the components. Adopting the carbonaceous reducing agent and combining the magnetic separation with the FeO oxidation during the proportion of the slag (the melting of the components) and the adjustment of the components, the invention solves the problem of decarbonization after the reduction in the traditional method; adopting the physical modification and the chemical modification, the invention solves the problems that the solid fayalite is difficult to reduce and the finished product contains more sulfur; adopting the proportion of the slag (the melting of the components) after the prereduction of the slag of nonferrous metal, the invention solves the problem of the generation of the foaming slag and the erosion of the furnace lining in the traditional smelting reduction step. According to the characteristics of the valuable elements such as the Fe, the Ni, the Cu and the like in the slag, the valuable elements can be directly used for producing heat-resisting structural steel. The secondary resources are used effectively, and the problem on the environmental protection during smelting the nonferrous metal is solved.

Description

technical field [0001] The invention belongs to the field of metallurgical materials, is suitable for extracting valuable elements from non-ferrous smelting slag by fire method, produces low-carbon and low-sulfur molten iron, and can be used for heat-resistant structural steel and the like. Background technique [0002] Copper, nickel and other non-ferrous metal elements coexist with iron, silicon and other elements in the earth's crust. When non-ferrous metals are smelted, iron, silicon and other elements often enter the slag phase as impurity components, of which iron elements account for more than 30% and nickel , copper, etc. Although the iron content is relatively high in terms of chemical composition, because it exists in the form of fayalite, when using carbonaceous reducing agents such as coal to extract metallic iron, solid-state reduction has a compact structure, low reduction rate, and high sulfur content in the metal phase. , liquid reduction is easy to produce ...

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method for extracting valuable elements from high-iron and high-silicon non-ferrous metal smelting slags to solve secondary resource utilization and environmental problems, such as figure 1 As shown, it mainly includes six processes of physical modification, oxidation modification, reduction treatment, magnetic separation, slag mixing-melting and composition adjustment, and extracts valuable elements such as iron and nickel from non-ferrous metal smelting slag to produce low-carbon , low-sulfur molten iron, can be used to produce heat-resistant structural steel

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