Method for directly reducing laterite-nickel ore to produce ferronickel alloy

Abstract

The invention discloses a method for directly reducing laterite-nickel ore to produce a ferronickel alloy, belonging to the technical field of metallurgy and chemistry. The method comprises the following steps of: (1) mixing the raw laterite-nickel ore with a carbonaceous reducing agent and a compound additive, and grinding in a ball mill; (2) uniformly stirring the mixture obtained by the step (1), and pelletizing; (3) feeding the pellets obtained by the step (2) into a preheater for preheating to remove natural moisture, and directly feeding the preheated pellets into a silicon nitride bonded silicon carbide reducing tank for reduction; and (4) performing water quenching grinding on the reduced product obtained by the step (3), and performing slag-iron separation by use of a magnetic separator to obtain the ferronickel alloy. By adopting the method disclosed by the invention, the reducing time is shortened, the production cost is reduced, the production efficiency is improved, and a new high-quality raw material is provided for smelting high-class nickel alloy particles; meanwhile, the production cost is only 1 / 3 of that of a traditional technology; and the technology has the advantages of large-scale continuous production, high automation degree and short technological flow.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to a method for directly reducing laterite nickel ore to produce ferronickel alloy. Background technique

[0002] Nickel is an important non-ferrous metal alloy element, mainly used for smelting stainless steel, nickel is used to produce stainless steel, nickel is a very large demand for stainless steel production enterprises, the usual production of nickel-based stainless steel needs to add 8wt-11wt% nickel, With the development of my country's stainless steel industry, the demand for nickel is also increasing day by day, and the nickel resources that can be exploited and utilized by humans are limited to nickel sulfide ore and laterite nickel ore (nickel oxide ore), of which 30% are nickel sulfide 70% of the mine is lateritic nickel ore.

[0003] At present, the common methods of producing ferronickel from laterite nickel ore include fire method...