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Method for producing inconel by submerged arc furnace

A submerged arc furnace and ferroalloy technology, which is applied in the direction of improving process efficiency, etc., can solve problems such as waste of chromium resources, achieve the effects of reducing slagging, avoiding resource waste, and reducing alloy smelting costs

Inactive Publication Date: 2008-03-12
张美焦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dephosphorization process can reduce phosphorus to the level required by the standard, it will inevitably remove chromium, and then add ferrochrome when smelting stainless steel, resulting in a serious waste of chromium resources

Method used

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Examples

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Effect test

Embodiment 1

[0018] Nickel oxide ore is used as raw material, and anthracite is used as fuel during sintering. Anthracite contains 0.019% phosphorus. When smelting in submerged arc furnace, semi-coke is used as reducing agent. Semi-coke contains 0.008% phosphorus, and the produced nickel-chromium-iron alloy contains 0.027% phosphorus. 12.5% ​​nickel, 3.3% chromium, phosphorus content is lower than the requirement of 0.035% for stainless steel, no dephosphorization is required, and all chromium can be retained in the alloy.

Embodiment 2

[0020] Nickel oxide ore is used as raw material, and anthracite is used as fuel when drying. Anthracite contains 0.005% phosphorus. When smelting in submerged arc furnace, semi-coke is used as reducing agent. Semi-coke contains 0.008% phosphorus, and the produced nickel-chromium-iron alloy contains 0.015% phosphorus. , 13.8% nickel, 4.6% chromium, phosphorus content is far lower than the requirement of 0.035% stainless steel, without dephosphorization, all chromium can be retained in the alloy.

Embodiment 3

[0022] Using nickel oxide ore as raw material, coke powder is used as fuel during sintering, containing 0.003% phosphorus, coke is used as reducing agent during smelting in submerged arc furnace, coke contains 0.018% phosphorus, and the produced nickel-chromium-iron alloy contains 0.03% phosphorus and 13.8% nickel %, chromium 3.2%, phosphorus content is lower than the requirement of stainless steel 0.035%, without dephosphorization, all chromium can be retained in the alloy.

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PUM

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Abstract

The invention relates to a production method of Ni-Cr-Fe alloy, in particular to a method for producing Ni-Cr-Fe alloy with an ore heating furnace. In the method, the raw material is nickel oxide ore; the fuel for calcining the crude ore contains P<=0.02%; the reducer used in smelting by the ore heating furnace contains P<=0.02%. The invention uses low-phosphorous fuel and reducer, the phosphorous contained in the product can meet the requirement for stainless steel, and it is not necessary to dephosphorize again in refining or directly smelting stainless steel, the chromium is kept in the product so as to become Ni-Cr-Fe alloy. Comparing with a prior method, the invention avoids waste, reduces operations and the cost in smelting alloy.

Description

Technical field: [0001] The invention relates to a method for producing nickel-chromium-iron alloy, in particular to a method for producing nickel-chromium-iron alloy with a submerged arc furnace. Background technique: [0002] Ferronickel is a good raw material for smelting stainless steel and casting, and is generally smelted from nickel oxide ore in a submerged arc furnace. Because nickel oxide ore contains not only nickel and iron, but also some chromium, depending on the chromium content of the raw ore, the crude ferronickel smelted in submerged arc furnace contains about 3-5% chromium, and some are as high as 8%. Since the crude ferronickel contains high impurities such as phosphorus and sulfur, it needs to be refined to remove impurities such as phosphorus and sulfur. Desulfurization requires a reducing atmosphere. The conventional molten iron desulfurization process can easily reduce sulfur to a very low level. Dephosphorization requires In an oxidizing atmosphere, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22B1/02
CPCY02P10/20
Inventor 张美焦
Owner 张美焦
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