Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A technology for ferrochrome powder and chrome alloy, which is applied in the field of smelting reduction smelting ferroalloy by shaft furnace method, can solve the problems of high cost, long process, pollute the environment, etc., and achieve the effects of reducing production cost, less equipment investment and protecting the environment.

Inactive Publication Date: 2005-07-20
BAOSHAN IRON & STEEL CO LTD +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet
  • Method for smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0019] Specific examples are as follows, adding 2.2t of chrome concentrate (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 ferrochrome fine ore cold-consolidated pellets 2.9t, and then add metallurgical coke for about 0.65t are sent to the upper part of shaft furnace 6 together;

[0020] 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 air blowing oxygen enrichment 8-20%, plus the gas produced by the shaft furnace itself is 3800m 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 (1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 smelt ferrochrome alloy with electric arc furnace, and the power consumption reaches 3000-4000kwh / t ferrochrome alloy. Ferroalloy plants are struggling to survive. Using less electricity and using powdered chromium 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. Fine ore is more than 20 US dollars / ton. Japan's Nippon Steel's patent reports the technology of converter smelting reduction to produce high-carbon ferrochrome. In th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com