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Method for smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet

A cold solidification and ball formation technology is applied in the field of shaft furnace smelting reduction and smelting of ferroalloys, which can solve the problems of long process, high cost and environmental pollution, and achieve the effects of reducing production cost, saving fuel and protecting the environment.

Inactive Publication Date: 2003-08-13
BAOSHAN IRON & STEEL CO LTD +1
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  • Application Information

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Problems solved by technology

Long process, high energy consumption, high cost and pollute the environment

Method used

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  • Method for smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet

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[0022] Add chrome concentrate 2.2t (containing Cr 2 o 3 / FeO>2, Cr 45%, Fe 22%), silica 0.24t, slaked lime 0.26t, anthracite coal powder or coke powder 0.51t, produce carbon-containing chromium ore cold-consolidated pellets 2.9t, then add about 0.65t of metallurgical coke , into the upper part of the shaft furnace 6 together.

[0023] The upper tuyere of the shaft furnace blows cold air for 800m through the blower 3 / t, 1800m of hot air with a temperature of 1250-1400°C is blown into the lower tuyeres 3 / t and 8-20% oxygen-enriched air blowing, plus 3800m of gas produced by the shaft furnace itself 3 / t is used to assist secondary combustion and preheat the cold-consolidated pellets of carbon-containing chromium powder ore, so that the direct smelting reduction reaction between chromium-containing powder ore and solid fuel is used to smelt chromium-containing alloy molten iron. In chromium-containing molten iron (1t), Cr : 40-50%, Si: 2-3%, C: 6-7%. Simultaneously produce...

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Abstract

A method for smelting Cr-containing iron alloy with cooled agglomerated pellet of powdered ore is characterized by use of the vertical furnace with two exhaust outlets, the Cr-containing ore powder and carbon powder cooled agglomeraing pellet as the raw materials, and the non-coke coal as primary energy source and reducer. The hot air at 1250-1400 deg.C heated by gas generated by furnace itself, the oxygen-enriched air, and cold air are blowed in the vertical furnace to smelt Cr-contained iron alloy. Its advantages are less consumption of energy and low cost.

Description

technical field [0001] The invention belongs to the field of smelting reduction smelting ferroalloys by shaft furnace method. Background technique [0002] One of the key factors in reducing the cost of stainless steel production is the use of low-priced high-carbon ferrochromium. At present, the conventional method of smelting ferrochrome alloy is to use electric arc furnace to smelt ferrochrome alloy, and the power consumption reaches 3000-4000kwh / t ferrochrome alloy. In areas with high electricity price, electricity cost is the main cost of ferrochrome alloy. Ferroalloy plants are struggling to survive. Using less electricity and using powdered chrome ore to produce chromium-containing hot metal has always been the goal pursued by the metallurgical industry. At present, the chromium ore produced in the world is mainly powder ore, and lump ore only accounts for 20-25% of the chromium ore output, and the price is lower than Fine ore is more than 20 US dollars / ton. The ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04
Inventor 周渝生方音曹传根徐心强陈宏张恺
Owner BAOSHAN IRON & STEEL CO LTD