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Natural gas tri-reforming red earth nickel ore pellet reducing system and method

A laterite nickel ore and natural gas technology, applied in the direction of reducing gas emissions, furnace types, furnaces, etc., can solve the problems of complex wet process, high requirements for equipment in process conditions, and long process, so as to reduce energy consumption and methane Content, the effect of realizing recycling

Pending Publication Date: 2017-08-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet process is more complicated, the process is long, and the process conditions require high equipment

Method used

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  • Natural gas tri-reforming red earth nickel ore pellet reducing system and method
  • Natural gas tri-reforming red earth nickel ore pellet reducing system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The natural gas is mixed with the first gas, and the resulting mixture contains CO and H 2 The volume ratio is 18%, CH 4 The volume ratio is 23%. The mixed gas is sent to the preheater, the temperature is raised from 40°C to 210°C, and then sent to the heater to rise to 780°C. The obtained temperature-rising mixed gas is sent to the burner to undergo partial oxidation reaction with oxygen to obtain reducing gas, the temperature is 960℃, where CO and H 2 The volume ratio is 33%, CH 4 The volume of the gas is 16%, and the reducing gas is sent to the shaft furnace. The sponge iron produced by the reduction of laterite nickel ore pellets contains metallic iron and metallic nickel. Metallic iron and metallic nickel can be used as catalysts for the reforming reaction of methane, carbon dioxide and methane in the reducing gas to generate CO and H 2 . CO and H 2 During the upward movement, it fully contacts with laterite nickel ore pellets moving from top to bottom, and further...

Embodiment 2

[0060] The natural gas is mixed with the first gas, and the resulting mixture contains CO and H 2 The volume ratio is 16%, CH 4 The volume ratio is 22%. The mixed gas is sent to the preheater, the temperature is raised from 50°C to 300°C, and then sent to the heater to rise to 800°C. The obtained temperature-rising mixed gas is sent to the combustor to undergo partial oxidation reaction with oxygen to obtain reducing gas with a temperature of 1050℃, in which CO and H 2 The volume ratio is 30%, CH 4 The proportion of the volume is 13%, and the reducing gas is sent into the shaft furnace. The sponge iron produced by the reduction of laterite nickel ore pellets contains metallic iron and metallic nickel. Metallic iron and metallic nickel can be used as catalysts for the reforming reaction of methane, carbon dioxide and methane in the reducing gas to generate CO and H 2 . CO and H 2 During the upward movement, it fully contacts with laterite nickel ore pellets moving from top to b...

Embodiment 3

[0063] The natural gas is mixed with the first gas, and the resulting mixture contains CO and H 2 The volume ratio is 17%, CH 4 The volume ratio is 21%. The mixed gas is sent to the preheater, the temperature is raised from 40°C to 200°C, and then sent to the heater to rise to 700°C. The obtained temperature-rising mixed gas is sent to the combustor to undergo partial oxidation reaction with oxygen to obtain reducing gas, the temperature is 950℃, in which CO and H 2 The volume ratio is 40%, CH 4 The proportion of the volume is 15%, and the reducing gas is sent into the shaft furnace. The sponge iron produced by the reduction of laterite nickel ore pellets contains metallic iron and metallic nickel. Metallic iron and metallic nickel can be used as catalysts for the reforming reaction of methane, carbon dioxide and methane in the reducing gas to generate CO and H 2 . CO and H 2 During the upward movement, it fully contacts with laterite nickel ore pellets moving from top to bott...

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Abstract

The invention relates to a natural gas tri-reforming red earth nickel ore pellet reducing system and method. In the system, a shaft furnace is provided with a red earth nickel ore pellet inlet, a reducing gas inlet, a sponge iron outlet and a furnace top gas outlet; a cooling dust remover is provided with a furnace top gas inlet, a first gas outlet and a second gas outlet; the furnace top gas inlet is connected with the furnace top gas outlet of the shaft furnace; a preheater is provided with a mixed gas inlet and a preheating mixed gas outlet; the mixed gas inlet is connected with the first gas outlet of the cooling dust remover; a heater is provided with a preheating mixed gas inlet and a heating mixed gas outlet; the preheating mixed gas inlet is connected with the preheating mixed gas outlet of the preheater; a combustor is provided with an oxygen inlet, a heating mixed gas inlet and a reduced gas outlet; the heating mixed gas inlet is connected with the heating mixed gas outlet of the heater; and the reduced gas outlet is connected with the reduced gas inlet of the shaft furnace. The natural gas tri-reforming red earth nickel ore pellet reducing system and method can selectively reduce red earth nickel ore pellets, prepare high-grade ferro-nickel alloys and achieve recycling of energy.

Description

Technical field [0001] The invention relates to a system and method for reducing laterite nickel ore pellets by natural gas triple reforming. Background technique [0002] Laterite nickel ore is formed by long-term weathering and metamorphism of ultramafic rocks containing iron-magnesium silicate minerals. The upper layer is of limonite type, mainly composed of iron oxides; the middle layer is a transition layer; the lower layer is silicon-magnesium-nickel Ore bed. Laterite nickel ore is rich in resources, low in mining costs, and the process of beneficiation and smelting is becoming mature. It can produce a variety of intermediate products such as nickel oxide and ferronickel. It is the main source of nickel resources in the future. At present, the processes for processing laterite nickel ore include: fire process, wet process, and fire-wet combined process. [0003] The fire process is used to treat high-magnesium and low-iron laterite nickel ore. The main product is nickel-iro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C21B13/02
CPCY02P10/143C22B23/023C21B13/0073C21B13/02C22B23/021
Inventor 员晓范志辉刘亮曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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