Nickel slag processing method for efficiently recovering iron resource

Abstract

The invention provides a nickel slag processing method for efficiently recovering an iron resource. The method includes the steps that nickel slag is fused, the temperature is kept, a modification agent is added, heat preservation is carried out, and modified nickel slag with the alkalinity ranging from 1.0 to 1.4 is obtained after complete reacting is made; air or oxygen is blown from the bottom or from the top below the liquid face, weak oxidation treatment is carried out on the modified nickel slag, and oxidized nickel slag is obtained; after the temperature of the oxidized nickel slag falls to 1200 DEG C with the temperature fall rate smaller than or equal to 5 DEG C / min, water quenching cooling is carried out, and solidified nickel slag is obtained after complete solidification; the solidified nickel slag is crushed and ground until the particle size is smaller than 200 meshes; and magnetic separation is carried out on slag obtained after cracker grinding, magnetic materials are recovered, and nickel slag processing is completed. By means of the processing method, the iron resource can be recovered from the nickel slag, harmful elements in the nickel slag cannot be brought into iron-rich phases, and an iron ore concentrate can be completed replaced in use. Low-energy-consumption, low-cost and safe and easy processing recovery of the iron resource is achieved, and the method is of great significance in promoting nickel slag resource recycling, enterprise energy saving and emission reduction and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of metallurgical resource reuse, and relates to a method for recovering iron from nickel slag, in particular to a nickel slag treatment method for efficiently recovering iron resources. Background technique [0002] Nickel slag is industrial waste slag discharged during the process of smelting nickel metal. About 6 to 16 tons of slag are discharged from the production of 1 ton of nickel. Only Jinchuan Group in Gansu Province discharges more than 1 million tons of nickel slag every year, with a cumulative stockpile of more than 10 million tons. Nickel slag treatment is an important process in the nickel metallurgy process. It is not only related to the smoothness of nickel smelting, but also involves issues such as slag discharge and environmental pollution. It is the main issue in the development of circular economy in nickel metallurgy. [0003] The chemical composition of nickel slag varies with the nickel...

AI Technical Summary

Problems solved by technology

[0006] However, since the iron oxide in the fayalite phase is wrapped by the quartz phase, the strength is high, the structure is compact, and it is difficult to be penetrated by the reducing gas, resulting in poor reducibility. It must be replaced by a solid C reducing agent at a higher temperature. Reduction, the reduction products are Fe and SiO 2 ; From the ion theory of slag, it can be known that the pure quartz phase has a very high viscosity, which will make it difficult to separate the reduced slag and iron; trace elements contained in nickel slag, such as Cu, As and other elements will be reduced and brought into the iron , which cannot be removed in the later stage of iron and steel smelting and seriously affects the quality of iron and steel; according to the actual situation of nickel slag treatment in Jinchuan Company, a large amount of foamy slag will be generated in the process of iron reduction and iron extraction, causing slag to splash; in addition, the energy consumption of reducing and replacing FeO High, not economically feasible, and has not yet formed an industrial production scale, resulting in a large amount of nickel slag piled up in the slag yard

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