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

System and method for directly reducing laterite-nickel ore through hydrogen shaft furnace dry-method self-reforming

A technology of laterite nickel ore and shaft furnace, which is applied in the field of laterite nickel ore smelting, can solve the problems of low production efficiency of direct reduced iron, low methane cracking rate, poor catalytic effect, etc., so as to avoid catalyst deactivation, improve smelting efficiency, clean production effect

Inactive Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when self-reforming is carried out in the shaft furnace, the catalyst used is an iron-based catalyst, which has poor catalytic effect and low methane cracking rate, resulting in (H 2 +CO)≤90%, so the production efficiency of direct reduced iron is low and the quality is not high

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
  • System and method for directly reducing laterite-nickel ore through hydrogen shaft furnace dry-method self-reforming
  • System and method for directly reducing laterite-nickel ore through hydrogen shaft furnace dry-method self-reforming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Use natural gas as the reducing gas. After desulfurization, the natural gas is sent into the heating furnace and heated to 1050°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Wherein, in the laterite nickel ore oxidized pellets, the mass content of nickel is 0.8%, and the mass content of iron is 35%. After thermal reduction, it enters the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, through cracking and self-reforming reaction, the synthetic reducing gas is produced, in which H 2 And the volume fraction of CO is 93%. and H 2 / CO is 1.6. Synthetic reducing gas moves upwards, heats and reduces the laterite nickel ore oxide pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduction time is 4 hours. In th...

Embodiment 2

[0051] Use natural gas as the reducing gas. After desulfurization, the natural gas enters the heating furnace and is heated to 1050°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Wherein, in the laterite nickel ore oxidized pellets, the mass content of nickel is 1.7%, and the mass content of iron is 20%. After the hot reducing gas enters the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, the synthetic reducing gas is produced through cracking and self-reforming reactions, in which H 2 And the volume fraction of CO is 95%. and H 2 / CO is 1.6. The synthetic reducing gas moves upwards, heats and reduces the laterite nickel ore oxide pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduction time is 2 hours. In th...

Embodiment 3

[0053] Coke oven gas is selected as the reducing gas. The coke oven gas enters the heating furnace after desulfurization and is heated to 950°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Wherein, in the laterite nickel ore oxidized pellets, the mass content of nickel is 1.7%, and the mass content of iron is 20%. After the hot reducing gas enters the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, the synthetic reducing gas is produced through cracking and self-reforming reactions, in which H 2 And the volume fraction of CO is 93%. and H 2 / CO is 1.8. Synthetic reducing gas moves upwards, heats and reduces the laterite nickel ore oxide pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduction time is 3 hours. ...

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 relates to a system and method for directly reducing laterite-nickel ore through hydrogen shaft furnace dry-method self-reforming. The system comprises a desulfuration device, a heating furnace and a hydrogen shaft furnace, wherein the desulfuration device is provided with a reducing gas inlet and a desulfuration reducing gas outlet; the heating furnace is provided with a desulfuration reducing gas inlet and a thermal reducing gas outlet; the desulfuration reducing gas inlet is connected with the desulfuration reducing gas outlet of the desulfuration device; the hydrogen shaft furnace is provided with a laterite-nickel ore inlet, a thermal reducing gas inlet, a reducing metal pellet outlet and a gas outlet; and the thermal reducing gas inlet is connected with the thermal reducing gas outlet of the heating furnace. By the adoption of the reducing gas dry-method self-reforming technology, metal iron and metal nickel generated by self-reduction of the laterite-nickel ore serve as catalysts, high cost for independently using the catalysts can be omitted, the catalyst deactivation phenomenon caused by carbon deposition when the catalysts are recycled for a long time is avoided, the smelting efficiency of the laterite-nickel ore is high, and emission of CO2 is low.

Description

technical field [0001] The invention relates to the field of laterite nickel ore smelting, in particular to a system and method for directly reducing laterite nickel ore by using hydrogen shaft furnace dry method self-reforming. Background technique [0002] At present, 60% of global mine nickel production comes from nickel sulfide ore, and 40% comes from laterite nickel ore. Among the 220 million tons of nickel ore reserves in the world, laterite nickel ore accounts for about 70%. With the continuous reduction of nickel sulfide ore resources and the continuous improvement of laterite nickel ore smelting technology, the proportion of nickel produced by laterite nickel ore is increasing. [0003] For different laterite nickel ores, there are pyrotechnics, wet-processes, fire-wet-combined processes and other processes. Among them, the pyrotechnic process has short process, high efficiency and large processing scale, and is the dominant process for processing laterite nickel ...

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): C22B23/02
CPCC22B23/02
Inventor 范志辉刘亮员晓曹志成吴道洪
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