Process for smelting ferronickel from red soil nickel ore

Abstract

The invention discloses a method for smelting ferronickel from red soil nickel ore, which comprises the following steps of: 1) mixing the red soil nickel ore with coal dust or coke, and sintering for 2 to 8 hours to obtain sintered nickel ore; 2) smelting the sintered nickel ore, a flux and a reducing agent for 2 to 3 hours in an electric furnace to obtain a crude ferronickel melt; and 3) refining the crude ferronickel melt: a) ensuring that the melt temperature is higher than 1,450DEG C; b) adding a complex desulfurizer into the melt for desulfurization; c) detecting the sulfur content of the melt, stopping desulfurization when the sulfur content is lower than a preset value, detecting the melt temperature when the sulfur content is higher than the preset value, slagging off and raising the temperature of the melt and repeating the step b) until the sulfur content is lower than the preset value when the temperature is below 1,350DEG C, repeating the step b) until the sulfur content is smaller than the preset value when the temperature is higher than 1,350DEG C, and slagging off; d) adding a complex dephosphorization agent into the melt for dephosphorization; and e) casting and demolding to obtain the refined ferronickel alloy. The method has the advantages of simple process and low energy consumption.

Description

Technical field [0001] The invention relates to the field of chemical metallurgy processes, in particular to a process for smelting ferronickel from laterite nickel ore. Background technique [0002] As we all know, nickel is an important alloying element in the metallurgical industry. Due to its unique properties, nickel metal has a very wide range of applications in the production of stainless steel, special alloy steel, nickel plating, ceramic products, battery catalysts, etc. Materials occupies a very important position in national economic construction and national defense and military construction. [0003] With the wide application of stainless steel and special steel worldwide, the supply of nickel, the most important element of metallurgical stainless steel and special steel, is in short supply, causing prices to soar. At present, more than 60% of the world’s nickel products come from sulfide ore, and more than 60% of the world’s nickel resources are in laterite nickel or...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to at least solve one of the above-mentioned technical defects, especially to propose a process for smelting ferronickel from laterite nickel ore, which can effectively utilize the properties of ferronickel itself, that is, can remove high-content sulfur and reduce power consumption , while meeting the strict requirements of nickel-iron phosphorus content in stainless steel production, desulfurization and dephosphorization can be completed in one reaction vessel

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