Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing high-carbon ferrochrome

A high-carbon ferrochrome and chromite technology, applied in the chemical industry, can solve the problems of resource waste, land occupation, and large amount of slag discharge, and achieve the effects of reducing raw material costs, relieving environmental pressure, and solving low utilization rates

Pending Publication Date: 2017-11-17
JIANGSU PROVINCE METALLURGICAL DESIGN INST
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the comprehensive utilization rate of ferronickel slag in my country is low, and its treatment methods are mostly open-air stockpiling or landfill, which not only causes waste of resources, but also occupies a large amount of land and damages the surrounding ecological environment
Compared with other metallurgical slags, ferronickel slag has a low recovery value of valuable metals and a large amount of slag discharge, which has gradually become a major problem in the treatment of metallurgical waste slag

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] ferronickel slag (SiO 2 Mass fraction is 50%, MgO mass fraction is 18%, FeO mass fraction is 18%) broken to 20-50mm, obtains ferronickel slag fine particle, then chromite (Cr mass fraction is 29%, Fe mass fraction is 18%, MgO mass fraction is 12%, SiO 2 The mass fraction is 3.22%), nickel-iron slag fine particles, and coke according to the mass ratio of 75:25:15, and then directly smelt in the electric furnace at 1650-1750°C. After smelting, the slag and iron are separated to obtain high-carbon ferrochromium and chromium slag. Among them, high-carbon ferrochromium composition: Cr mass fraction is 50.09%, C mass fraction is 6.06%, chromium slag composition: SiO in chromium slag 2 Mass fraction is 34.21%, MgO mass fraction is 31.92%, Al 2 o 3 The mass fraction is 24.56%, Cr 2 o 3 The quality score is 3.76.

Embodiment 2

[0045] ferronickel slag (SiO 2 Mass fraction is 60%, MgO mass fraction is 10%, FeO mass fraction is 10%) broken to 20-50mm, obtains ferronickel slag fine particle, then chromite (Cr mass fraction is 20%, Fe mass fraction is 13%, MgO mass fraction is 17%, SiO 2 The mass fraction is 4.3%), nickel-iron slag fine particles, and coke according to the mass ratio of 80:20:18, and then directly smelt in the electric furnace at 1650-1750°C. After smelting, the slag and iron are separated to obtain high-carbon ferrochromium and chromium slag. Composition of high carbon ferrochrome: Cr mass fraction is 50.8%, C mass fraction is 8.35%, chromium slag composition: SiO in chromium slag 2 Mass fraction is 34.51%, MgO mass fraction is 35.95, Al 2 o 3 The mass fraction is 22.58%, Cr 2 o 3 The mass fraction is 2.69%.

Embodiment 3

[0047] ferronickel slag (SiO 2 Mass fraction is 55%, MgO mass fraction is 12%, FeO mass fraction is 15%) broken to 20-50mm, obtains ferronickel slag fine particle; Chromite (Cr mass fraction is 23%, Fe mass fraction is 15% %, MgO mass fraction is 15%, SiO 2 The mass fraction is 5%), reduced coal and bentonite are mixed and pelletized in a weight-to-mass ratio of 100:20:2, so as to obtain mixed pellets, and the mixed pellets are sent into a rotary hearth furnace at 1300°C for direct Reduction, in order to obtain metallized pellets, the metallization rate of iron in the metallized pellets is 85%, the metallization rate of chromium is 45%, and the metallized pellets and the nickel-iron slag and coke are in mass ratio 100: 12:5 batching and smelting in the electric furnace at 1650-1750°C. After smelting, slag and iron are separated to obtain high-carbon ferrochromium and chromium slag. Composition of high carbon ferrochromium: Cr mass fraction is 53.05%, C mass fraction is 6.00%...

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

The invention discloses a method for preparing high-carbon ferrochromium, comprising: mixing chromite, nickel-iron slag and coke to obtain a mixed material; supplying the mixed material to an electric furnace for smelting to obtain high-carbon ferrochromium And produce chromium slag. The method for preparing high-carbon ferrochromium of the present invention utilizes ferronickel slag to replace silica and dolomite as the flux for smelting high-carbon ferrochromium in an electric furnace. On the one hand, high-carbon ferrochromium can be effectively prepared; In the process of electric furnace smelting, it will also be reduced and recycled to realize the comprehensive utilization of magnesium oxide, silicon dioxide and iron oxide in nickel-iron slag.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing high-carbon ferrochrome. Background technique [0002] At present, the vast majority of domestic ferronickel slag is water-quenched slag produced in the state of water quenching and rapid cooling after the humus-type laterite nickel ore is reduced to extract nickel and some iron in a high-temperature molten state. The use of laterite nickel ore to produce ferronickel mostly uses submerged arc furnace reduction smelting, and the amount of slag accounts for 80% to 90% of the raw materials, which is a huge amount. Laterite nickel ore generally contains about 1.0-2.0% nickel, and the production of 20% ferronickel is the most. For example, the comprehensive recovery rate of nickel metal is 90%, and the amount of slag generated is at least 91%. According to statistics, in 2013, my country's annual output of ferronickel reached 710,000 tons, accompani...

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
IPC IPC(8): C22C27/06C22C1/02C22B34/32C22B5/10
CPCC22C27/06C22B5/10C22B34/32C22C1/02
Inventor 宋文臣王静静李红科曹志成汪勤亚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com