A method for producing nickel-iron alloy by two-step reduction of laterite nickel ore by natural gas-electric furnace melting

A technology of laterite nickel ore and nickel-iron alloy is applied in the field of non-ferrous metal metallurgy, which can solve the problems of insufficient utilization of tail gas, serious heat loss and high production cost, and achieve the effects of perfecting smelting process, improving nickel grade and high production efficiency

Active Publication Date: 2017-12-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the utilization of the above-mentioned nickel resources and the mineral characteristics of various types of laterite nickel ore, scholars at home and abroad have disclosed various methods for treating laterite nickel ore based on the pyrotechnic nickel-iron process. The production cost is high, and the exhaust gas produced is not fully utilized, the heat loss is serious, and it also has a certain impact on the environment

Method used

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  • A method for producing nickel-iron alloy by two-step reduction of laterite nickel ore by natural gas-electric furnace melting

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Effect test

Embodiment 1

[0023] like figure 1 As shown, the method for producing nickel-iron alloy by reducing laterite nickel ore in two steps with natural gas-electric furnace melting, crushing laterite nickel ore, and then introducing natural gas as a reducing agent to carry out the first step reduction in the first closed reduction furnace to obtain Reductant and reducing tail gas, add the reducing substance and reducing tail gas into the second closed reduction furnace for the second step reduction to obtain the reduction product and tail gas, the tail gas is returned to the second closed reduction furnace, and the reduction product is processed by the second closed reduction furnace. The nickel-iron alloy and slag are obtained by melting and fractionating in the electric furnace. The whole production process mentioned above is a continuous process, with less heat loss and high energy utilization rate.

[0024] Specific steps are as follows:

[0025] (1) First, the laterite nickel ore (including...

Embodiment 2

[0031] like figure 1 As shown, the method for producing nickel-iron alloy by reducing laterite nickel ore in two steps with natural gas-electric furnace melting, crushing laterite nickel ore, and then introducing natural gas as a reducing agent to carry out the first step reduction in the first closed reduction furnace to obtain Reductant and reducing tail gas, add the reducing substance and reducing tail gas into the second closed reduction furnace for the second step reduction to obtain the reduction product and tail gas, the tail gas is returned to the second closed reduction furnace, and the reduction product is processed by the second closed reduction furnace. The nickel-iron alloy and slag are obtained by melting and fractionating in the electric furnace. The whole production process mentioned above is a continuous process, with less heat loss and high energy utilization rate.

[0032] Specific steps are as follows:

[0033] (1) First, the laterite nickel ore (including...

Embodiment 3

[0039] like figure 1 As shown, the method for producing nickel-iron alloy by reducing laterite nickel ore in two steps with natural gas-electric furnace melting, crushing laterite nickel ore, and then introducing natural gas as a reducing agent to carry out the first step reduction in the first closed reduction furnace to obtain Reductant and reducing tail gas, add the reducing substance and reducing tail gas into the second closed reduction furnace for the second step reduction to obtain the reduction product and tail gas, the tail gas is returned to the second closed reduction furnace, and the reduction product is processed by the second closed reduction furnace. The nickel-iron alloy and slag are obtained by melting and fractionating in the electric furnace. The whole production process mentioned above is a continuous process, with less heat loss and high energy utilization rate.

[0040] Specific steps are as follows:

[0041](1) First, the laterite nickel ore (including ...

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Abstract

The invention relates to a method of preparing nickel-iron alloy through natural gas two-step reduction of nickel laterite and electric furnace smelting separation and belongs to the technical field of nonferrous metallurgy. The method of preparing nickel-iron alloy through natural gas two-step reduction of the nickel laterite and electric furnace smelting separation comprises the following steps: crushing the nickel laterite, then introducing natural gas as a reducing agent into a first closed type reduction furnace, carrying out first-step reduction to obtain a reduzate and reducing tail gas, adding the reduzate and the reducing tail gas in a second closed type reduction furnace, carrying out second-step reduction to obtain a reduzate and tail gas, returning the tail gas into the second closed type reduction furnace, and carrying out electric furnace smelting separation on the reduzate to obtain the nickel-iron alloy and slag. According to the method, as the whole production process is a continuous process, the heat loss is smaller, and the energy utilization ratio is high; and with combination of the two-step reduction through the closed type reduction furnaces and electric furnace smelting separation, the nickel laterite is treated with the natural gas as the reducing agent, and the production process of the nickel laterite is efficient and clean.

Description

technical field [0001] The invention relates to a method for preparing a nickel-iron alloy by two-step reduction of laterite nickel ore with natural gas and electric furnace melting, and belongs to the technical field of non-ferrous metal metallurgy. Background technique [0002] Nickel has good plasticity, corrosion resistance and magnetic properties, so it is mainly used in steel, nickel-based alloys, electroplating and batteries, etc. It is widely used in various military manufacturing industries such as aircraft and radar, civil machinery manufacturing and Electroplating industry, etc. Two-thirds of the world's primary nickel ore is used for the production of stainless steel. Stainless steel accounts for 61% of the world's nickel consumption structure, and nickel for stainless steel in China has accounted for 84% of the total consumption. With the rapid development of social industry, the consumption of nickel continues to increase, and the nickel sulfide ore with highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22B5/12C22B23/02C22C19/03
CPCC22B5/12C22B23/02C22C1/023C22C19/03
Inventor 李博丁志广魏永刚周世伟王华
Owner KUNMING UNIV OF SCI & TECH
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