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Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature

A technology for laterite nickel ore and nickel-iron alloy, which is applied in the field of low-temperature smelting of laterite nickel ore to produce nickel-iron alloy, can solve the problems of difficult separation of slag and iron, low thermal efficiency, ring formation, and nodulation.

Active Publication Date: 2013-11-06
NEW METALLURGY HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some people have tried various non-blast furnace methods to smelt laterite ore, they have common problems. When the reduction temperature is low, it is difficult to separate slag and iron. To separate, high-temperature reduction must be used. Currently, the conversion method used in non-blast furnace ironmaking Hearth furnaces, rotary kilns and tunnel kilns are not exclusive equipment for high-temperature reduction of laterite ore. Rotary hearth furnaces have high temperature exhaust gas, resulting in low thermal efficiency. A large amount of dust is generated by the explosion, which makes the process flow difficult; the rotary kiln is suitable for lower temperature reduction, and its temperature is raised to high temperature. The melting point of the laterite slag is low, and it will form rings, nodules, and erode the furnace lining, making the process difficult; tunnel The kiln is also a proprietary equipment for sponge iron, put it in a high temperature state, the problem is similar to the rotary hearth furnace (straightened rotary hearth furnace)

Method used

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  • Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition of the laterite nickel ore used in Example 1 is shown in Table 1, and the reducing agent is coke powder, and the composition is shown in Table 2.

[0047] Table 1 The main chemical components of laterite nickel ore / wt%

[0048] TF

[0049] Table 2 Main components of coke powder / wt%

[0050] fixed carbon

[0051] The equipment used is a hammer crusher with a production capacity of 1.5t / h and a power of 2.2kw, a mixing and pressing ball machine with a power of 15kw, and the smelting device is an integrated device, which is divided into drying, preheating, decrystallization water, In the stages of low-temperature pre-reduction, deep reduction, nickel-iron grain growth, and cooling, the maximum smelting capacity is 1t / h, and 5000kJ / m is used in the low-temperature pre-reduction section 3 Natural gas heating is used, and natural gas anoxic heating is used for deep reduction and ferronickel grain growth. After cooling, the crushing equipm...

Embodiment 2

[0062] The composition of the laterite nickel ore used in Example 2 is shown in Table 5, which is a typical low-grade laterite nickel ore. The reducing agent is anthracite, and its composition is shown in Table 6. First, the laterite nickel ore powder containing 10-20wt% of physical water and anthracite coal powder with an average particle size of 40 mesh are mixed according to the carbon-to-oxygen ratio of 1.1:1 and pressed into balls to obtain an elliptical ball with a length of about 50 mm and a width of about 20 mm.

[0063] Table 5 Chemical composition of laterite nickel ore powder / wt%

[0064] TF

[0065] Table 6 Chemical composition of anthracite / wt%

[0066] fixed carbon

[0067] The equipment used is the same as in Example 1, and what is slightly adjusted is that electric heating is used in the stage of deep reduction and nickel-iron crystal grain growth, so that it can be ensured that in the atmosphere of this stage (CO+H 2 ) / (CO+H 2 +H 2 O+CO...

Embodiment 3

[0075] Similar to Example 1, but adding 10% CaO to the laterite nickel ore powder to remove part of the physical water, adding coke powder at a carbon-to-oxygen ratio of 0.95:1, and adding a total of 2% of the mixed binder. Other smelting parameters are the same as in Example 1. A qualified nickel-iron alloy can also be obtained, whose composition is similar to that of the nickel-iron alloy in Example 1, and the CaO content in the slag is significantly higher than the CaO content in the slag in Example 1 (see Table 9).

[0076] Table 9 Main components of slag / wt%

[0077] Cr

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Abstract

The invention provides a method for producing nickel-iron alloy by smelting a red earth nickel mineral at a low temperature and belongs to the field of preparation of non-ferrous metallurgy. A process flow is as follows: after the red earth nickel mineral and a carbon reducing agent are molded, molding raw materials are subjected to drying, pre-heating and crystallization water removing; pre-reduction, deep reduction and growth of nickel-iron alloy grains are carried out; and after a cooling step, the separation of the nickel-iron alloy and furnace dregs is realized in a magnetic selection manner. Compared with the prior art, the method has the advantages of being low in reaction temperature, low in energy consumption, easy to obtain the high-quality nickel-iron alloy grains, simple in preparation process and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgical preparation of nonferrous metals, in particular to a method for producing ferronickel alloy by low-temperature smelting of laterite nickel ore. 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 consumed for the production of stainless steel, and the demand for nickel for stainless steel accounts for about 66% of the total global nickel consumption. [0003] At present, the proven industrial reserves of nickel metal on land are about 80 million tons, of which nickel sulfide ore accounts for about 20%, laterite nickel ore accounts for about 75%, and nickel silicate ore accounts for 5%. Traditional nickel metallurgy uses nickel sulfide ore for smelting, but it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B5/10C22C1/02C22C19/03
Inventor 赵沛郭培民庞建明
Owner NEW METALLURGY HI TECH GRP
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