Method for producing ferronickel through reduction smelting of laterite-nickel ore flash furnace

Abstract

The invention relates to the technical field of pyrometallurgy, in particular to a method for producing ferronickel through reduction smelting of a laterite-nickel ore flash furnace, which is short inflash reduction smelting time, high in speed, high in production efficiency, energy-saving and environment-friendly, and the reduction time is within one minute. Iron in the slag is reduced to prepare the iron-containing semi-steel alloy; remelting of said alloy is carried out to form qualified molten steel, meanwhile, submerged arc furnace slag is also obtained; the submerged arc furnace slag can serve as cement clinker to be conveyed to a cement plant to produce high-quality cement. The process is simple, the flow is short, qualified molten steel can be smelted and recycled, cement can be manufactured, economic benefits are good, environmental protection is facilitated, and hot materials subjected to multi-stage cyclone drying and pre-reduction directly enter a rotary kiln to be roasted; on one hand, the material buffering effect is achieved, and the material blocking problem caused when the hot materials directly enter the rotary kiln can be avoided; and on the other hand, throughfurther pre-reduction roasting of the rotary kiln, agglomeration of the materials can be achieved, and equipment and operation safety problems caused by direct feeding of the powdery materials into the furnace is avoided.

Description

technical field [0001] The invention relates to the technical field of pyrometallurgy, in particular to a method for producing ferronickel by reduction smelting of laterite nickel ore in a flash furnace. Background technique [0002] Nickel-bearing laterite ore is metamorphosed by nickel-bearing peridotite after long-term weathering and leaching in tropical or subtropical regions. Due to weathering and leaching, ore deposits generally form several layers, the top is a colluvial layer (iron cap), which contains low nickel, and is generally discarded and stockpiled; the lower layer is a limonite layer, which contains more iron, less silicon and magnesium, and lower nickel , cobalt is relatively high, and the wet process is generally used to recover metals; the lower layer is the humus layer mixed with gangue (including silicon-magnesium nickel ore), which contains high silicon and magnesium, low iron, high nickel, and low cobalt. Minerals are generally treated by pyrotechnics...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the Caron process are: the ore treatment adopts drying, reduction, roasting and other processes, which consumes a lot of energy, the production efficiency is low, and it is not environmentally friendly; the recovery of metals adopts a wet process, which consumes a variety of chemical reagents, and the economic benefit is low; the recovery of nickel and cobalt Low-speed flash smelting compared to fire process and HPAL process is a new process developed in modern times for oxidative matte smelting of copper-nickel sulfide concentrate