Process and product of nickel and chromium containing pig iron with fume or scale containing nickel and chromium

A nickel-chromium pig iron and oxide scale technology, applied in the field of metallurgy, can solve the problems of high smelting cost and low output, and achieve the effects of short smelting time, high output and viscosity relief

Inactive Publication Date: 2007-08-22
刘光火 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the special viscosity of chromium-containing ore, it cannot be solved by the aforementioned method of processing steelmaking dust, and the continuous reduction method requires a special reduction rotary kiln
In the prior art, the soot and scale of the steelmaking furnace are treated by wet method, the smelting cost is high and the output is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The raw material is selected from the smoke generated during the stainless steel smelting process. The soot contains 15-30% iron, 1.5-5% nickel and 1.5-4.5% chromium. Taking the chromium content as a reference, mix with 6% chromium fluorite and 8% limestone, crush and sieve, mix and stir with 20% chromium coke powder, soot and water glass, and then put it into a briquette machine ball. The amount of water glass added should be moderate, so that the materials can be bonded together. The particle size of the pellets is 1-5 cm. Dry the pellets and put them directly into submerged arc furnace or electric furnace for smelting to obtain nickel-chromium pig iron products, which mainly contain nickel 1.5-20%, chromium 3-20%, iron 60-70%, carbon 0.5-3%, silicon 0.5-1.5%, the balance is impurities.

Embodiment 2

[0015] The raw material is selected from stainless steel scale. The oxide skin contains 20-35% of iron, 2-4% of nickel and 1.5-3.5% of chromium. Taking the chromium content as a reference, mix with 6% chromium fluorite and 8% limestone, crush and sieve it, mix it with 20% chromium coke powder, oxide skin and water glass, and then put it into the briquetting machine ball. The amount of water glass added should be moderate, so that the materials can be bonded together. The particle size of the pellets is 1-5 cm. Dry the pellets and put them directly into submerged arc furnace or electric furnace for smelting to obtain nickel-chromium pig iron products, which mainly contain nickel 1.5-4%, chromium 3-20%, iron 60-70%, carbon 0.5-3%, silicon 0.5-1.5%, the balance is impurities.

Embodiment 3

[0017] The raw material is selected from the smoke generated during the stainless steel smelting process. The soot contains 15-30% iron, 1.5-4% nickel and 1.5-4.5% chromium. Take the chromium content as a reference, add fluorite with 6% chromium content and limestone with 8% content, crush and sieve, mix with coke powder and soot with 20% chromium content, sinter at 700-1000℃, and then crush Put it into submerged arc furnace or electric furnace for smelting to obtain nickel-chromium pig iron products, which mainly contain 1.5-20% nickel, 3-20% chromium, 60-70% iron, 0.5-3% carbon, and 0.5-1.5% silicon. The balance is impurities.

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Abstract

In a an ore smelting furnace or an electric furnace, nickel and chromium containing pig iron is produced with nickel and chromium containing fume or oxide scale, fluorite in 5-7 wt% of the nickel content, coke powder in 20-25 wt% and limestone or lime in 5-10 wt%. The present invention has the advantages of sufficient recovering of nickel and chromium, high output, low cost and short smelting period.

Description

Technical field: [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for smelting nickel-chromium pig iron with nickel-chromium-containing dust or scale. Background technique: [0002] With the wide application of stainless steel and special steel in the world, the supply of nickel and chromium, the most important elements for smelting stainless steel and special steel, is in short supply. Making full use of nickel and chromium resources is an important issue in the smelting industry. It is a subject of public concern in the metallurgical industry to utilize the fumes and metal oxide scales generated during smelting to reproduce metals. Chinese patent application CN1151338A discloses a method and product for producing iron powder from steelmaking converter dust or sludge. The converter dust or sludge is stirred, dispersed, and prepared into a slurry, and the pulp is subjected to rough separation—ball milling— —Selection—drying—redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B7/00C22B1/14C22C38/40
CPCY02P10/20
Inventor 刘光火刘沈杰
Owner 刘光火
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