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Pyrolysis and reduction reaction system and method for laterite nickel ore dye pellets

A technology of laterite nickel ore and pyrolysis, which is applied in special forms of dry distillation, coke oven, petroleum industry, etc., can solve the problem of oil and gas resources not being used more effectively, and reduce production costs, process energy consumption and costs. , the effect of reducing process energy consumption and cost

Active Publication Date: 2016-12-07
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the direct reduction process of laterite nickel ore rotary hearth furnace, reduced coal powder only plays the role of reducing minerals and supplying part of heat, and its own precious oil and gas resources have not been used more effectively.

Method used

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  • Pyrolysis and reduction reaction system and method for laterite nickel ore dye pellets
  • Pyrolysis and reduction reaction system and method for laterite nickel ore dye pellets
  • Pyrolysis and reduction reaction system and method for laterite nickel ore dye pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 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 pyrolysis zone is 30º, the temperature of the pyrolysis zone is 500°C, the included angle of the reduction zone is 300º, and the temperature of the reduction zone is 1250°C. The pyrolysis oil and gas obtained are processed by the oil and gas recovery device to obtain tar, gas, metal The pellets are sent to the slag-iron separation device for slag-iron separation treatment to obtain ferronicke...

Embodiment 2

[0060]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 100:25:15 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 Reduction treatment, the included angle of the pyrolysis zone is 40º, the temperature of the pyrolysis zone is 650°C, the included angle of the reduction zone is 290º, the temperature of the reduction zone is 1300°C, the pyrolysis oil and gas obtained are processed by the oil and gas recovery device to obtain tar and gas, and metallized The pellets are sent to the slag-iron separation device for slag-iron separation treatment to obtain ferronickel powder (containi...

Embodiment 3

[0062] 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 100:40:9 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 pyrolysis zone is 50º, the temperature of the pyrolysis zone is 850°C, the included angle of the reduction zone is 280º, and the temperature of the reduction zone is 1400°C. The pelletized pellets are sent to the slag-iron separation device for slag-iron separation treatment to obtain ferronickel powder (containing Ni 3.83%, TFe75.83%) and tailings. The nickel recovery rate of the whole process is 97...

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Abstract

The invention relates to the field of chemical industry metallurgy, in particular to a pyrolysis and reduction reaction system and method through laterite nickel ore. Aiming at that it is not considered that oil and gas resources in raw coal are recycled in the direct reduction process in the existing laterite nickel ore treating technology of a rotary hearth furnace, the invention provides a pyrolysis and reduction reaction system and method for laterite nickel ore dye pellets to achieve pyrolysis of the coal and reduction smelting of the laterite nickel ore in the coal-based direct reduction process of the laterite nickel ore. By means of the system, the pyrolysis of the coal can be achieved in the direct reduction process of the laterite nickel ore, so that the valuable oil and gas resources can be recycled, and therefore by-products of the coal-based direct reduction process of the rotary hearth furnace are increased, and energy consumption and cost of the process are reduced. Meanwhile, pyrolyzed semi-coke continues to participate in the direct reduction reaction of the laterite nickel ore in the rotary hearth furnace, and metallized pellets are obtained.

Description

technical field [0001] The invention relates to the field of chemical metallurgy. In particular, the present invention relates to a system and method 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 exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B1/24C22B5/10C10B53/04
CPCC10B53/04C22B1/2406C22B5/10C22B23/005C22B23/021C22B23/023
Inventor 宋文臣王静静李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST