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

A technology for laterite nickel ore and flue gas waste heat, which is applied in coke ovens, special forms of dry distillation, petroleum industry, etc., can solve the problem of not considering the recovery of oil and gas resources, etc., to improve the recovery rate, reduce process energy consumption and cost, and achieve efficient recovery. Effect

Active Publication Date: 2018-08-28
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • 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 treating laterite nickel ore does not consider recovering the oil and gas resources in the reduced coal in the direct reduction process, the present invention proposes a type of high-efficiency recovery of the heat of the laterite nickel ore dry pellets by reusing the waste heat of the flue gas inside the furnace body. Decomposition and reduction reaction system and method, to realize coal pyrolysis in laterite nickel ore coal-based direct reduction process and reduction smelting of laterite nickel ore to produce granular iron

Method used

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

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Effect test

Embodiment 1

[0061] The laterite nickel ore (containing Ni 1.85%), bituminous coal (25% volatile content) and sodium carbonate are batched and mixed in the mixing batching device at a mass ratio of 100:10:5 to obtain the mixed material, and the mixed material is in the forming device The mixed pellets are obtained by molding in the drying device, and then the mixed pellets are dried in a drying device to obtain dry pellets (1.0% water content), and then the dried pellets are heated in a rotary hearth furnace with pyrolysis and reduction functions. Decomposition and reduction treatment, a layer of 5mm thick blue charcoal is placed in the bottom of the rotary hearth furnace before the dry pellets, the angle of the pyrolysis zone is 30º, the temperature of the pyrolysis zone is 500℃, and the angle of the reduction zone is 300º. The temperature of the reduction zone is 1350℃. The heat source of the heating tube in the pyrolysis zone is the high-temperature dust removal flue gas of the rotary hea...

Embodiment 2

[0063] The laterite nickel ore (containing 2.45% Ni), lignite (40% volatile content) and limestone are batched and mixed in the mixing batching device according to the mass ratio of 100:30:15 to obtain the mixed material, and the mixed material is in the forming device After forming the mixed pellets, the mixed pellets are dried in a drying device to obtain dry pellets (water content 1.5%). The dry pellets are pyrolyzed and reduced in a rotary hearth furnace with pyrolysis and reduction functions. For reduction treatment, a layer of 10mm thick blue charcoal is placed on the bottom of the rotary hearth furnace before the dry pellets. The ring angle of the pyrolysis zone is 60º, the temperature of the pyrolysis zone is 700℃, and the ring angle of the reduction zone is 270º. The temperature is 1400℃, the heat source of the heating tube in the pyrolysis zone is the high-temperature dust removal flue gas of the rotary hearth furnace. The pyrolysis oil and gas obtained after the pyrol...

Embodiment 3

[0065] The laterite nickel ore (containing Ni 1.12%), sub-bituminous coal (35% volatile content) and lime are batched and mixed in the mixing batching device according to the mass ratio of 100:20:9 to obtain the mixed material. The mixed material is in the forming device The mixed pellets are obtained by molding in the process, and then the mixed pellets are dried in a drying device to obtain dry pellets (0.5% water content), and the dry pellets are pyrolyzed in a rotary hearth furnace with pyrolysis and reduction functions And reduction treatment, a layer of 15mm thick blue charcoal is placed in the bottom of the rotary hearth furnace before the dry pellets, the angle of the pyrolysis zone is 90º, the temperature of the pyrolysis zone is 900℃, the temperature of the reduction zone is 1450℃, and the circle of the reduction zone The ring angle is 240º. The heat source of the heating tube in the pyrolysis zone is the high temperature dust removal flue gas of the rotary hearth furn...

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Abstract

The invention relates to the field of chemical metallurgy, in particular to a system for utilizing nickel laterite ore for pyrolysis and reduction reactions. A recycling type pyrolysis and reduction reaction system and method for efficiently recycling nickel laterite ore dry pellets in a smoke waste heat furnace body are provided for overcoming defects in the prior art so as to achieve pyrolysis of coal and reduction smelting of nickel laterite ore in the coal-based direct reduction process of the nickel laterite ore, so that grained iron is produced. In the system, semicoke obtained after pyrolysis participates in the direct reduction reaction of the nickel laterite ore in a rotary hearth furnace to obtain the metalized pellets. According to the system, coal pyrolysis can be achieved in the direct reduction process of the nickel laterite ore, oil and gas resources can be recycled, byproducts of a rotary hearth furnace coal-based direct reduction technology are increased, smoke waste heat generated in the furnace body is effectively reutilized, environment friendliness is achieved, and technology energy consumption and cost are indirectly reduced. In addition, the metalized pellets are subjected to two times of recycling, the recycling rate of the nickel laterite ore is increased to some degree, and therefore the nickel laterite ore is efficiently recycled.

Description

Technical field [0001] The invention relates to the field of chemical metallurgy. Specifically, the present invention relates to a system that utilizes the pyrolysis and reduction reaction of laterite nickel ore. 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, using laterite nickel ore as raw material and coal powder as reducing agent, direct reduction method is used to reduce iron and nickel in the ore to metallic iron and metallic nickel, and then undergo smelting or grinding. Enrich nickel in ferronickel products. [0003] Nowadays, there are many kinds of coal-based direct reduction processes. Among them, the rotary hearth furnace reduction process has the advantages of simple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C22B1/24C22B5/10C10B53/04
CPCY02P20/129
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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