Method for extracting iron by utilizing nickel slag and preparing fibers

Abstract

The invention provides a method for extracting iron by utilizing nickel slag and preparing fibers. The method comprises the following steps of: adding a reducing agent and auxiliary materials to nickel slag discharged in a nickel smelting process to reduce oxides of iron in the nickel slag into iron; after the iron is separated, adding an additive to the remaining molten nickel slag; and blowing or throwing the molten mixture with the additive through high-speed air or a centrifugation throwing machine to prepare inorganic fibers. According to the method, on the basis of melting and reducing the thermal nickel slag for refining the iron, the remaining slag is used as a main raw material to prepare the inorganic slag fibers, and the waste nickel slag is changed into valuable materials and recycled, so that the sensible heat of the thermal nickel slag is sufficiently utilized, and the energy consumption in the processes of refining the iron from the nickel slag and producing the fibers is reduced. The main components of the prepared inorganic nickel slag fibers are SiO2, Al2O3 and the like, and the prepared inorganic nickel slag fibers belong to high-temperature inorganic fibers andcan be widely applied to the fields of pipe warm preservation, industrial fire resistance and warm preservation and the like.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial waste residues, in particular to a method for extracting iron and preparing fibers by using nickel slag. Background technique [0002] Nickel slag is a kind of industrial waste discharged in the process of smelting nickel metal. Nickel slag with Fe 2 o 3 , SiO 2 It is the main component, which is the granulated slag formed after the melt is quenched by water, and some enterprises directly discharge it without water quenching. The temperature of hot nickel slag is 1100-1300°C, which contains a lot of sensible heat. [0003] With the development of my country's economy, my country's nickel production has increased rapidly in recent years. It was only 40,000 tons in 1997, 67,000 tons in 2004, and nearly 90,000 tons in 2010. To produce 1 ton of nickel by flash furnace smelting method, 6 to 16 tons of nickel slag need to be discharged. At present, about 900,000 tons of nicke...

AI Technical Summary

Problems solved by technology

[0004] At present, the research on nickel slag at home and abroad focuses on the extraction and recovery of Fe. The iron oxide in nickel slag is mainly composed of FeO SiO 2 It exists in the form of iron oxides, and it is difficult to enrich iron oxides by conventional beneficiation methods

At present, there are some high-temperature reduction processes and methods, which can efficiently extract useful iron and nickel, but the utilization of high-temperature silicate slag after iron extraction is currently less researched, and there are not many methods, and nickel has not yet been used. Process of making inorganic fiber from slag

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