Method for preparing ferronickel by enriching nickel in laterite-nickel ore

A technology of laterite nickel ore and ferronickel is applied in the field of metallurgy, which can solve the problems of increasing the difficulty of stainless steel smelting, and achieve the effect of good nickel recovery, avoiding corrosion to equipment and high nickel content.

Active Publication Date: 2018-01-12
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not increase the nickel-iron-nickel content much, and the iron still has a high recovery rate. At the same time, due to the addition of sulfur-containing additives, the sulfur content in the nickel-iron must be greatly increased. , high-sulfur ferronickel will inevitably increase the difficulty of stainless steel smelting

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  • Method for preparing ferronickel by enriching nickel in laterite-nickel ore
  • Method for preparing ferronickel by enriching nickel in laterite-nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dry the laterite nickel ore and crush it to -5mm. The reducing agent is added to the coal powder according to the excess of 40% of the internal carbon. 0.5%. Various raw materials are fully mixed and pressed into blocks, and fully pre-reduced in a tunnel kiln at a temperature of 1100-1200 ° C. The pre-reduced product is oxidized in the furnace with the atmosphere, the secondary oxidation temperature is 1000-1150 ° C, and the oxidation time is 120 Minutes, the oxidized product is melted in a submerged arc furnace at 1450-1500°C for 30 minutes to separate the slag and gold to obtain ferronickel. Through experimental analysis, the contents of nickel and iron in the ferronickel product are 12.97% and 79.97% respectively, and the recovery rates of nickel and iron are 92.64% and 49.43% respectively.

Embodiment 2

[0026] Dry the laterite nickel ore and crush it to -5mm. The reducing agent is added to coal powder according to the excess internal carbon content of 20%. The amount of flux fluorite added is 8% of the laterite nickel ore. 1.5%. Various raw materials are fully mixed and pressed into blocks, and fully pre-reduced at a temperature of 1100-1200°C in a rotary kiln. The pre-reduced product is selectively oxidized at 900-1100°C under an atmospheric atmosphere, and the oxidation time is 30 minutes. The oxidized product is melted in a submerged arc furnace at 1400-1450°C for 30 minutes to separate slag and gold to obtain ferronickel. Through experimental analysis, the contents of nickel and iron in the ferronickel product are 13.56% and 81.46% respectively, and the recovery rates of nickel and iron are 91.86% and 48.88% respectively.

Embodiment 3

[0028]Dry the laterite nickel ore and crush it to -5mm. The reducing agent is added to coal powder according to the excess internal carbon content of 20%. The amount of fluxing agent fluorite added is 15% of the laterite nickel ore. 1.0%. Various raw materials are fully mixed and pressed into blocks, and fully pre-reduced at a temperature of 1100-1150 °C in a rotary kiln. The pre-reduced product is selectively oxidized at 800-1150 °C under an atmospheric atmosphere, and the oxidation time is 30 minutes. The oxidized product is melted in a submerged arc furnace at 1350-1400°C for 30 minutes to separate slag and gold to obtain ferronickel. Through experimental analysis, the contents of nickel and iron in the ferronickel product are 14.94% and 81.2% respectively, and the recovery rates of nickel and iron are 98.6% and 46.37% respectively.

[0029] In embodiment 1,2,3, the rate of recovery of nickel after the pre-reduction product is oxidized is all higher than 90%, and the rate ...

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Abstract

The invention discloses a method for preparing ferronickel by enriching nickel in laterite-nickel ore. The method comprises the following steps that 1, crushed laterite-nickel ore powder is uniformlymixed with a reducing agent and a fluxing agent, and the mixed materials are pressed into blocks; and 2, heating and pre-reducing in a high-temperature kiln, selective oxidation and melting separationare carried out sequentially to obtain the ferronickel with high content of nickel. According to the method, selective oxidation of iron and nickel in a pre-reduced product is realized, the content of nickel in the ferronickel can be greatly improved, meanwhile, the high recovery rate of nickel is realized, and the obtained high-quality ferronickel is beneficial to smelting of stainless steel. The method has the advantages of being high in raw material adaptability, simple in technological process, high in operability, high in product quality, good in recovery effect of nickel, low in energyconsumption, low in processing cost, and capable of providing a new direction for the enrichment of nickel in the laterite-nickel ore.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing ferronickel by enriching nickel with laterite nickel ore. Background technique [0002] The lateritic nickel ore is the main source of primary nickel resources at present. The nickel content is much lower than the iron content. However, nickel and iron have similar physical and chemical properties, and they are all attached to the silicate containing aluminum and magnesium. They are effectively separated by physical beneficiation and other methods. Therefore, how to effectively enrich nickel in laterite nickel ore has become a hot and difficult point in the current research on the deep processing of laterite nickel ore. At present, the enrichment of nickel in pyroprocessing lateritic nickel ore is mainly concentrated in the pre-reduction process. The main methods are: (1) Selective reduction (controlling the reduction atmosphere by reducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B23/02
Inventor 杭桂华薛正良肖承鹏
Owner WUHAN UNIV OF SCI & TECH
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