Phosphorus-containing coarse nickel iron refining dephosphorization method

A crude nickel and dephosphorization technology, applied in the direction of improving process efficiency, can solve the problems of reducing nickel direct yield, large nickel loss, large slag amount, etc., and achieves the effects of uniform distribution, less slag amount, and low energy consumption

Inactive Publication Date: 2010-12-29
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Converter dephosphorization needs to oxidize a large amount of iron and silicon, so the amount of slag is large, and the loss of nickel with slag is large, which reduces the direct recovery rate of nickel
When the temperature is lower than 1600°C, the dephosphorization of the Kaldor furnace needs to be sprayed with low-sulfur heavy oil to heat up, which may cause sulfur return and carburization

Method used

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  • Phosphorus-containing coarse nickel iron refining dephosphorization method
  • Phosphorus-containing coarse nickel iron refining dephosphorization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put the phosphorus-containing coarse nickel-iron raw material whose main chemical composition is 9.87% Ni, 80.23% Fe and 0.11% P into the medium-frequency induction furnace and heat up to 1500 ° C, and add coarse nickel-iron to the molten thick nickel-iron stirred by electromagnetic stirring Lime powder with 3% nickel-iron mass and 0.5% fluorite powder, lime and fluorite melt rapidly at high temperature;

[0022] (2) Blow industrial oxygen with a pressure of 0.3MPa into the melt in the furnace for top blowing refining, keep the oxygen lance muzzle 40mm away from the melt surface, stop the oxygen supply after blowing for 15 minutes, and tap the iron after slag removal to refine nickel Phosphorus in iron is reduced to 0.012%, both carbon and silicon are reduced to less than 0.015%, the nickel content is 16.23%, and the direct recovery rate of nickel is 95.34%.

Embodiment 2

[0024] (1) Put the phosphorus-containing coarse nickel-iron raw material whose main chemical composition is 8.12% Ni, 84.78% Fe and 0.15% P into the intermediate frequency induction furnace and heat up to 1600 ° C, and add coarse nickel-iron to the molten thick nickel-iron stirred by electromagnetic stirring Limestone powder with 8% nickel-iron mass and 3% fluorite powder, lime and fluorite melt rapidly at high temperature;

[0025] (2) Blow industrial oxygen with a pressure of 0.7MPa into the melt in the furnace for top-blown refining, keep the mouth of the oxygen lance at a distance of 15mm from the melt surface, stop the oxygen supply after 3 minutes of blowing, and tap the iron after slag removal to refine nickel Phosphorus in iron is reduced to 0.009%, both carbon and silicon are reduced to less than 0.015%, the nickel content is 15.88%, and the direct yield of nickel is 95.83%.

Embodiment 3

[0027] (1) Add phosphorus-containing coarse ferronickel raw materials whose main chemical components are 8.74% Ni, 82.76% Fe and 0.14% P into a power frequency induction furnace and heat up to 1550°C, then add 4.5% lime powder and 1.0% fluorite powder by mass of coarse nickel-iron, lime and fluorite melt rapidly at high temperature;

[0028] (2) Blow high-pressure air with a pressure of 0.5Mpa into the melt in the furnace for top blowing refining, keep the mouth of the oxygen lance at a distance of 30mm from the surface of the melt, stop the oxygen supply after blowing for 10 minutes, tap the iron after slag removal, and refine nickel Phosphorus in iron is reduced to 0.009%, both carbon and silicon are reduced to less than 0.015%, the nickel content is 15.19%, and the direct recovery rate of nickel is 96.26%.

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Abstract

The invention provides a method for the dephosphorization of phosphorized crude-nickel iron by refining; a dephosphorization agent of lime or limestone with 3 to 8 percent of the quality of the crude-nickel iron and flux fluorite with 0.5 to 3 percent of quality of the crude-nickel iron are added in the melt high sulfur crude-nickel iron in a middle-frequency induction furnace; under a high temperature, the dephosphorization agent and the flux are melt; the industrial oxygen or high pressure air with a pressure of 0.3 to 0.7MPa is blown into the flux in the furnace; top blowing and refining are carried out for 3 to 15 minutes under the condition of a temperature of 15000 to 1600 DEG C to lead the carbon thereof to be oxidized and carry out slagging after partial iron is led to be oxidizedwith the impurities like silicon and phosphor; after the refining is finished, the slag is removed to obtain the refined nickel iron; wherein, the phosphor, the carbon and the silicon are reduced to be below 0.015 percent; the quality of the nickel is improved to be above 15 percent; the direct yield of nickel is equal to or more than 95 percent. The method of the invention has a simple techniqueand low energy consumption; besides, the method of the invention is easy to realize industrial production.

Description

technical field [0001] The invention relates to a method for refining and dephosphorizing coarse ferronickel containing phosphorus, which belongs to the technical field of nonferrous metallurgy and ferroalloy production. technical background [0002] In industry, nickel is mainly used in the production of stainless steel, special alloy steel and in nickel plating, ceramic products, batteries, catalysts and other fields. At present, more than 60% of the world's nickel products come from sulfide ores, but more than 60% of the world's total nickel resources exist in laterite nickel ores. With the gradual reduction of nickel sulfide ore resources in the world, the development and utilization of laterite nickel ore is of great significance to the development of nickel industry. [0003] Ferronickel obtained by reducing and smelting laterite nickel ore in blast furnace or electric furnace can be used to produce stainless steel after refining. Using ferronickel as a substitute fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCY02P10/20
Inventor 陈为亮朱星荣殷国平伍贺东李跃光黄中省彭振坤朱骏戴永年
Owner KUNMING UNIV OF SCI & TECH
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