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
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  • 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 a

Method used

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  • 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

Example Embodiment

[0048] Example 1

[0049] Natural gas is selected as the reducing gas. After desulfurization, the natural gas is sent to a 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. Among them, in the laterite nickel ore oxidized pellets, the mass content of nickel is 0.8%, and the mass content of iron is 35%. After thermally reducing it into the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, through the cracking and self-reforming reaction, the synthesis reducing gas is produced, where H 2 The volume fraction of CO and CO is 93%. And H 2 / CO is 1.6. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the...

Example Embodiment

[0050] Example 2

[0051] Natural gas is selected 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. Among them, 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, through the cracking and self-reforming reaction, the synthetic reducing gas is produced. 2 The volume fraction of CO and CO is 95%. And H 2 / CO is 1.6. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduc...

Example Embodiment

[0052] Example 3

[0053] Use coke oven gas 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. Among them, 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, through the cracking and self-reforming reaction, the synthetic reducing gas is produced. 2 The volume fraction of CO and CO is 93%. And H 2 / CO is 1.8. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduction t...

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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

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Application Information

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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
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