Roasting process of nickel-containing materials

Abstract

The invention discloses a nickel-containing material roasting process, which comprises the following steps: adding nickel-containing material and granular coal into the rotary kiln from the tail end of the rotary kiln; drumming fuel from the head end of the rotary kiln into the rotary kiln; The head end of the rotary kiln blows primary air into the rotary kiln to control the shape and length of the flame; the head end of the rotary kiln blows into the rotary kiln the secondary air that controls the head area of ​​the rotary kiln into a reducing atmosphere; and from The fired hot roasting material is discharged from the head end of the rotary kiln. According to the nickel-containing material roasting process of the present invention, part of nickel oxides and iron oxides can be pre-reduced, reducing power consumption for subsequent electric furnace smelting.

Description

technical field [0001] The invention relates to a nickel-containing material roasting process, in particular to a nickel-containing material roasting process capable of reducing power consumption during subsequent electric furnace smelting. Background technique [0002] Nickel-containing materials, such as nickel laterite ore, are usually smelted in an electric furnace. Before smelting in an electric furnace, they usually need to be roasted in a rotary kiln to remove the moisture in them. [0003] When traditional rotary kiln is used for traditional roasting of nickel-containing materials, cold nickel-containing materials are added into the rotary kiln from the kiln tail, and fuel is sprayed into the kiln head for roasting. The entire rotary kiln is an oxidizing atmosphere without any Reduction, so the nickel and iron oxides in the material will not be reduced, and the power consumption of the subsequent electric furnace is very large. [0004] When roasting in a traditiona...

AI Technical Summary

Problems solved by technology

[0004] When roasting in a traditional rotary kiln, the dehydration effect of the roasted material is poor, especially the crystal water cannot be completely removed

[0005] The hot roasted material discharged from the head end of the traditional rotary kiln is usually cooled and then sent to the electric furnace for smelting, so the heat of the roasted material is not used, wasting energy, and resulting in increased power consumption of the subsequent electric furnace

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