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A pyrolysis and reduction reaction system and method for reusing laterite-nickel ore dry pellets in a flue gas waste heat furnace body

A technology of laterite nickel ore and flue gas waste heat, which is applied in the field of chemical industry and metallurgy, can solve the problem of not considering the recovery of oil and gas resources, and achieve the effect of reducing process energy consumption and cost, reducing process energy consumption and cost, and increasing by-products

Active Publication Date: 2018-08-28
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that the existing rotary hearth furnace technology for processing laterite nickel ore does not consider the recovery of oil and gas resources in the reduced coal in the direct reduction process, the present invention proposes a pyrolysis and recovery of laterite nickel ore dry pellets that are reused inside the flue gas waste heat furnace body. Reduction reaction system and method to realize the pyrolysis of coal in the coal-based direct reduction process of laterite nickel ore and the reduction smelting of laterite nickel ore to produce ferronickel powder

Method used

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  • A pyrolysis and reduction reaction system and method for reusing laterite-nickel ore dry pellets in a flue gas waste heat furnace body
  • A pyrolysis and reduction reaction system and method for reusing laterite-nickel ore dry pellets in a flue gas waste heat furnace body

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Effect test

Embodiment 1

[0059] The laterite nickel ore (containing Ni 1.85%), bituminous coal (25% volatile matter) and sodium carbonate are batched and mixed in the batching device according to the mass ratio of 100:10:5 to obtain a mixed material, and the mixed material is processed in the molding device The mixed pellets are obtained by forming in a drying device, and then the mixed pellets are dried in a drying device to obtain dry pellets (water content 1.0%), and the dry pellets are pyrolyzed in a rotary hearth furnace with pyrolysis and reduction functions And reduction treatment, the included angle of the ring in the pyrolysis zone is 30º, the temperature in the pyrolysis zone is 400°C, the included angle of the ring in the reduction zone is 300º, the temperature in the reduction zone is 1000°C, the heat of the heating pipe comes from the high-temperature dedusting flue gas of the rotary hearth furnace, The obtained pyrolysis oil and gas are processed by the oil and gas recovery device to obta...

Embodiment 2

[0061] The laterite nickel ore (containing Ni 2.45%), lignite (40% volatile matter) and limestone are batched and mixed in the batching device according to the mass ratio of 100:20:15 to obtain a mixed material, and the mixed material is placed in the molding device Perform molding treatment to obtain mixed pellets, then dry the mixed pellets in a drying device to obtain dry pellets (1.5% water content), and perform pyrolysis and reduction of dry pellets in a rotary hearth furnace with pyrolysis and reduction functions For reduction treatment, the included angle of the ring in the pyrolysis zone is 60º, the temperature in the pyrolysis zone is 600°C, the included angle of the ring in the reduction zone is 270º, the temperature in the reduction zone is 1250°C, and the heat of the heating pipe comes from the high-temperature dedusting flue gas of the rotary hearth furnace. The pyrolysis oil and gas are processed by the oil and gas recovery device to obtain tar and gas, and the me...

Embodiment 3

[0063] The laterite nickel ore (containing Ni 1.12%), sub-bituminous coal (35% volatile matter) and lime are mixed and mixed in the batching device according to the mass ratio of 100:30:9 to obtain the mixed material, and the mixed material is processed in the molding device The mixed pellets are obtained by molding in a drying device, and then the mixed pellets are dried in a drying device to obtain dry pellets (water content 0.5%), and the dry pellets are pyrolyzed in a rotary hearth furnace with pyrolysis and reduction functions And reduction treatment, the included angle of the ring in the pyrolysis zone is 100º, the temperature in the pyrolysis zone is 900°C, the included angle of the ring in the reduction zone is 240º, the temperature in the reduction zone is 1400°C, the heat of the heating pipe comes from the high-temperature dedusting flue gas of the rotary hearth furnace, The obtained pyrolysis oil and gas are processed by the oil and gas recovery device to obtain tar ...

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Abstract

The invention relates to the field of chemical metallurgy and in particular to a system for utilizing pyrolyzation and reduction reaction of laterite nickel ores. Aiming at the problem in the traditional technology of treating the laterite nickel ores by a rotary hearth furnace that recovery of oil and gas resources in the direct reduction process is not considered, the invention provides flue gas waste heat boiler body interior reusing type system and method for pyrolyzation and reduction reaction of laterite nickel ore dry pellets to realize pyrolyzation of coals and reduction smelting of the laterite nickel ores in the laterite nickel ore coal-based direct reduction process to produce nickel-iron powder. In the system, semicoke after pyrolyzation continuously participates in the direct reduction reaction of the laterite nickel ores in the rotary hearth furnace to obtain metallized pellets. With adoption of the system, pyrolyzation of the coals can be realized in the laterite nickel ore direct reduction process, so that the valuable oil and gas resources are recovered, and the amount of byproducts of the rotary hearth furnace coal-based direct reduction technology is increased; and in addition, flue gas waste heat produced in the furnace body can be effectively reused, so that greenness and environmental protection are realized, and the energy consumption and the cost of the technology are indirectly lowered.

Description

technical field [0001] The invention relates to the field of chemical metallurgy. Specifically, the present invention relates to a system utilizing laterite nickel ore pyrolysis and reduction reactions. Background technique [0002] In recent years, with the depletion of high-grade nickel sulfide ore and the rapid development of the domestic stainless steel industry, low-grade laterite nickel ore has become the main raw material for the production of ferronickel products. In order to solve the problem of rational utilization of laterite nickel ore, use laterite nickel ore as raw material and coal powder as reducing agent, adopt direct reduction method to reduce the iron and nickel in the ore into metallic iron and metallic nickel, and then undergo melting or grinding Enrich nickel into ferronickel products. [0003] Nowadays, there are many kinds of coal-based direct reduction processes. Among them, the rotary hearth furnace reduction process has attracted extensive attent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C21B11/00
CPCC21B11/00C22B23/021
Inventor 宋文臣王静静李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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