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Laterite-nickel ore processing method for efficiently recovering nickel resources

A technology of laterite nickel ore and processing method, which is applied in the field of recovering nickel resources, can solve the problems that the nickel recovery rate is difficult to reach 90%, the grading treatment of raw materials is not considered, the cost of briquetting is increased, etc. The effect of production costs

Inactive Publication Date: 2015-07-01
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method crushes all the laterite nickel ore to a finer particle size and then briquettes during the raw material treatment, and does not consider the classification of the raw material.
Moreover, the rollers are easy to wear during the briquetting process, resulting in higher briquetting costs, which to a certain extent lead to increased briquetting costs and energy waste
When the laterite nickel ore with low nickel grade (such as nickel grade 1%-1.2%) is processed by the above method, if the product after melting is not followed up, the recovery rate of nickel is difficult to reach more than 90%, resulting in waste of nickel resources

Method used

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  • Laterite-nickel ore processing method for efficiently recovering nickel resources

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Effect test

Embodiment 1

[0031] The raw material is laterite nickel ore containing 1.18% nickel and 10.64% iron, mixed according to the weight ratio of 100 parts of laterite nickel ore, 10 parts of non-coking coal, and no flux added. After the coal is mixed evenly, it is directly distributed into the regenerative coal-based rotary hearth furnace without pressing the balls. The laterite nickel ore with a particle size of less than 2mm is mixed with coal and pressed into pellets. After being dried by the chain grate machine, it is distributed into the regenerative coal-based furnace In a rotary hearth furnace, reduce at 1280°C for 35 minutes. The high-temperature flue gas discharged from the rotary hearth furnace is returned to the furnace front system for pellet drying, and the products discharged from the rotary hearth furnace are sent to the melting furnace for melting at 1430-1550°C for 1 hour to obtain nickel-iron alloy products, molten slag, and molten slag After cooling, carry out grinding-magnet...

Embodiment 2

[0033] The raw material is laterite nickel ore containing 1.35% nickel and 18.08% iron, mixed according to the weight ratio of 100 parts of laterite nickel ore, 11 parts of non-coking coal, and 5 parts of white ash, wherein the laterite nickel ore of 2mm-8mm grain size and coal Lime and ash are mixed evenly and put into the regenerative coal-based rotary hearth furnace directly without pressing the balls. The laterite nickel ore with a particle size of less than 2mm is mixed with coal and lime and pressed into pellets. The coal-based rotary hearth furnace is reduced for 40 minutes at 1250°C, and the high-temperature flue gas discharged from the rotary hearth furnace is returned to the furnace front system for pellet drying, and the products discharged from the rotary hearth furnace are sent to the melting furnace for melting 1h, get nickel-iron alloy products and molten slag, after the molten slag is cooled, carry out grinding-magnetic separation treatment, the grinding finenes...

Embodiment 3

[0035] The raw material is laterite nickel ore containing 1.51% nickel and 24.68% iron, mixed according to the weight ratio of 100 parts of laterite nickel ore, 14 parts of non-coking coal, and no flux added. After the coal is mixed evenly, it is directly distributed into the regenerative coal-based rotary hearth furnace without pressing the balls. The laterite nickel ore with a particle size of less than 2mm is mixed with coal and pressed into pellets. After being dried by the chain grate machine, it is distributed into the regenerative coal-based furnace The rotary hearth furnace was reduced at 1300°C for 40 minutes, and the high-temperature flue gas discharged from the rotary hearth furnace was returned to the furnace front system for drying pellets. Nickel-iron alloy products and molten slag, the molten slag is cooled and subjected to grinding-magnetic separation treatment, the grinding fineness is controlled at -0.074mm, accounting for 70%, the magnetic field strength is 1...

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Abstract

The present invention provides a laterite-nickel ore processing method for efficiently recovering nickel resources, which can save the early pellet processing cost and improve the recovery rate of nickel. The method comprises the following steps of: (1) laterite-nickel ore classification: crushing and screening the laterite-nickel ore; adding the reducing coal and fluxing agent into the laterite-nickel ore being larger than 2 mm and directly feeding the mixture into a rotary hearth furnace; adding the reducing coal and fluxing agent into the laterite-nickel ore being smaller than 2 mm and pressing the mixture into carbon-containing pellets by a pellet press; and drying the carbon-containing pellets and feeding the pellets into the rotary hearth furnace; (2) pre-reduction: feeding the carbon-containing pellets into a heat-accumulation type coal-based rotary hearth furnace, and performing high-temperature quick reduction in the furnace, the reduction temperature being from 1,200°C to 1,300°C, and the reduction time being from 20 min to 45 min; (3) melting: feeding the discharge product of the rotary hearth furnace into a melting device for slag-iron separation to produce nickel-iron alloy; and (4) levigation, sorting and melting: crushing the melting slag obtained by Step (3), performing ore grinding and magnetic separation, and returning the metal iron powder after the magnetic separation to the melting device in Step (3) for slag-iron separation to obtain the nickel-iron alloy.

Description

technical field [0001] The invention relates to a method for recovering nickel resources, in particular to a laterite nickel ore treatment method for efficiently recovering nickel resources. Background technique [0002] With the wide application of stainless steel and special steel, the demand for nickel as a raw material for stainless steel is increasing, which directly leads to the soaring price of nickel in the world, and nickel has become an important factor affecting the stainless steel industry. At present, the laterite nickel ore mainly has the following pyrolysis treatment processes: [0003] The "sinter-small blast furnace" process smelts and produces low-nickel-iron alloys (the product contains 1-4% nickel): the disadvantages of this process are that the small blast furnace has problems such as low blast furnace utilization coefficient, high energy consumption, unstable quality of nickel and iron, and serious pollution. . At present, the country has issued an or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B1/00C22B5/10C22B1/16C22C19/03
CPCC22B23/023C22B23/021C22B23/005C22C1/023C22C19/03C22C1/02
Inventor 吴道洪王静静曹志成
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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