Method for preparing electric furnace smelting nickel-iron alloy raw material by using laterite nickel ore

A technology of laterite nickel ore and electric furnace smelting, applied in the field of metallurgy, can solve the problems of high energy consumption, easy oxidation of charge materials, spontaneous combustion, etc., and achieve the effects of low roasting temperature, reduced energy consumption, and low energy consumption

Active Publication Date: 2020-01-31
SUZHOU INST OF INDAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems of high energy consumption in the prior art for preparing nickel-iron alloys in electric furnaces, the prepared charge is easy to oxidize and spontaneously ignite, which is not conducive to transportation and storage

Method used

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  • Method for preparing electric furnace smelting nickel-iron alloy raw material by using laterite nickel ore

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Effect test

Embodiment 1

[0029] The lateritic nickel ore has a nickel grade of 1.86% and an iron grade of 21.30%. Firstly, the laterite nickel ore is ground to a particle size of less than 200 meshes, accounting for 70% of the particle size, then the quicklime and laterite nickel ore are mixed, the alkalinity is adjusted to 1.2, and the pellets are prepared. After the pellets are dried, the temperature at 950°C and the oxygen content are Baking in 8% oxidizing atmosphere for 20min. Put the roasted pellets into the first reactor, and feed the mixed gas of natural gas, water vapor and the tail gas of the third reactor into the first reactor, wherein the proportion of water vapor is 5%, and the third reaction The proportion of reactor tail gas is 35%, the proportion of natural gas is 60%, the pressure inside the reactor is 1.5MPa, the roasting temperature is 950°C, and the roasting time is 30min. The calcination temperatures in the second and third reactors were 850°C and 750°C respectively, the calcina...

Embodiment 2

[0034]The lateritic nickel ore has a nickel grade of 1.58% and an iron grade of 18.10%. First, the laterite nickel ore is ground to a particle size of less than 200 meshes, accounting for 80% of the particle size, then the quicklime and laterite nickel ore are mixed, the alkalinity is adjusted to 1.0, and the pellets are prepared. After the pellets are dried, the temperature at 950°C and the oxygen content are Baking in 10% oxidizing atmosphere for 20min. Put the roasted pellets into the first reactor, and pass the mixed gas of biogas, water vapor and tail gas in the third reactor into the first reactor, in which the proportion of water vapor is 5%, and the third reaction The proportion of tail gas is 20%, the proportion of biogas is 75%, the pressure inside the reactor is 1.8MPa, the roasting temperature is 1000°C, and the roasting time is 20min. The calcination temperatures in the second and third reactors were 900°C and 700°C respectively, the calcination times were 20min ...

Embodiment 3

[0036] The lateritic nickel ore has a nickel grade of 1.25% and an iron grade of 16.3%. Firstly, the laterite nickel ore is ground to a particle size of less than 200 meshes, accounting for 80%, and then the quicklime and laterite nickel ore are mixed, and the alkalinity is adjusted to 0.8 to prepare pellets. After the pellets are dried, the temperature at 1000°C and the oxygen content are Baking in 12% oxidizing atmosphere for 20min. Put the roasted pellets into the first reactor, and feed the mixed gas of natural gas, water vapor and the tail gas of the third reactor into the first reactor, wherein the proportion of water vapor is 5%, and the third reaction The proportion of reactor tail gas is 30%, the proportion of natural gas is 65%, the pressure inside the reactor is 2.0MPa, the roasting temperature is 950°C, and the roasting time is 30min. The calcination temperatures in the second and third reactors were 900°C and 650°C respectively, the calcination times were 20min a...

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Abstract

The invention discloses a method for preparing an electric furnace smelting nickel-iron alloy raw material by using laterite nickel ore. The method comprises the following steps of (1) uniformly mixing the laterite-nickel ore and an alkaline flux to prepare a pellet; (2) roasting the pellet in an oxidizing atmosphere; and (3) placing the roasted pellet in a reactor, and introducing mixed gas of carburizing gas and water vapor for reaction. Compared with that of an existing method for preparing an electric furnace smelting nickel-iron alloy raw material through a coal-based rotating kiln and gas-based vertical furnace method, the roasting temperature of the method is lower, the relative energy consumption is low, prepared electric furnace raw materials are relatively stable, and oxidation and spontaneous combustion are not prone to occurring.

Description

technical field [0001] The invention relates to a method for preparing nickel-iron alloy raw material in an electric furnace by using laterite nickel ore, belonging to the technical field of metallurgy. Background technique [0002] Nickel is an important strategic metal material, which has the characteristics of corrosion resistance, oxidation resistance, high temperature resistance, high strength and good ductility, and has a wide range of uses in modern industry. Nickel is mainly used in the production of stainless steel, and the demand for nickel for stainless steel accounts for more than 60% of the world's total nickel consumption. The mineral resources of nickel mainly include nickel sulfide ore and laterite nickel ore, and about 70% of nickel exists in laterite nickel ore. At present, the main method for preparing ferronickel alloys from laterite nickel ore is the pre-reduction-smelting ferronickel method (RKFF). The method first needs to use coal or reducing gas as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/10C22B1/24C22B1/02C22B5/12
CPCC22B1/02C22B1/24C22B5/12C22B11/10Y02P10/143
Inventor 吕亚男
Owner SUZHOU INST OF INDAL TECH
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