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Ni-Cr-Fe alloy and its production process

A production method and ferroalloy technology, applied in blast furnaces, furnace types, furnaces, etc., can solve the problems of energy consumption, complex production process, waste of manpower, etc., and achieve the effects of reducing production costs, simplifying smelting processes, and improving productivity.

Inactive Publication Date: 2006-10-18
DONGDA CASTING WUJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because nickel ore contains low nickel grade, complex composition, many associated gangues, and is a refractory material, the production process of nickel extraction is very complicated, the production cost is high, and the product price is expensive. Therefore, in recent years, most of them use pure Steel mills that smelt stainless steel and alloy steel with nickel-based raw materials have switched to non-pure nickel-based raw materials
However, so far, there is no raw material that has both nickel and chromium content, which can directly meet the needs of smelting stainless steel
Therefore, people consume a lot of energy and use complicated processes to refine nickel and chromium, enrich them into ferronickel and ferrochromium with high purity, and then dilute them into stainless steel, which wastes a lot of manpower and financial resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First select the smelting raw materials:

[0028] Nickel-chromium ore: During the mining process of nickel-iron ore, the surface layer is 1 to 3 meters. Due to the low Ni content and high Fe content, it cannot meet the requirements of the nickel extraction process, so it is discarded as tailings. These discarded ores can be used as raw materials for smelting nickel-chromium-iron alloy (stainless steel mother liquor).

[0029] The composition weight content of the nickel-chrome ore is: iron: 50.4%; ferrous oxide: 1.03%; nickel: 0.96%; chromium: 2.21%; sulfur: 0.022%; Silicon oxide: 6.48%; Calcium oxide: 2.46%; Magnesium oxide: 1.33%; Aluminum oxide: 3.68%.

[0030] The composition weight content of the nickel-chromium ore powder is: iron: 52.50%; ferrous oxide: 1.03%; nickel: 0.78%; chromium: 2.35%; sulfur: 0.023%; phosphorus: 0.023%; Silica: 5.05%; Calcium oxide: 2.65%; Magnesium oxide: 0.89%; Aluminum oxide: 3.04%.

[0031] Stainless steel rolling skin: iron scale (...

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Abstract

The present invention is Ni-Cr-Fe alloy and its production process. The Ni-Cr-Fe alloy contains Ni 1.5-6.0 wt%, Cr 3.0-21.0 wt%, Si 0.6-2.0 wt% and Mn 0.3-0.8 wt%, except Fe, and can meet the requirement for use as material smelting stainless steel. The production process includes the following steps: producing Ni-Cr agglomerate with industrial Ni-Cr waste, Ni-Cr ore powder of granularity smaller than 10 mm, flux, coke and water and through pelletizing, sintering and sieving; and smelting with the Ni-Cr agglomerate, Ni-Cr ore of granularity greater than 10 mm, flux and coke in a blast furnace. The present invention has sang in resource and environment friendship.

Description

technical field [0001] The invention relates to the field of a nickel-chromium-iron alloy and a production method. Background technique [0002] At present, the raw materials for smelting stainless steel are mainly blast furnace molten iron + high carbon ferrochromium + ferronickel + stainless steel scrap. (Smelting in converter or electric furnace), while the production of high-carbon ferrochrome requires chromium-containing rich ore, which is smelted in an electric furnace, which has high energy consumption and high cost. The production of ferronickel involves non-ferrous metallurgy. For different nickel ores, different nickel extraction methods are selected, no matter hydrometallurgy (ammonia leaching or acid leaching) or pyrometallurgy. Because nickel ore contains low nickel grade, complex composition, many associated gangues, and is a refractory material, the production process of nickel extraction is very complicated, the production cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C21B3/04C21B5/02C22B1/14
CPCY02W30/50
Inventor 金连荣张兴华金学文
Owner DONGDA CASTING WUJIANG
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