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Method for comprehensively recycling nickel-containing limonite

A technology for limonite and mineral materials, which is applied in the field of comprehensive recovery and utilization of nickel-containing limonite, can solve the problems of low nickel and cobalt leaching rate, unrecoverable iron, and small consumption, and achieve low leaching temperature and inhibit leaching , The effect of low leaching pressure

Inactive Publication Date: 2009-04-15
ZHENGZHOU YONGTONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional sulfuric acid pressurized acid leaching method to treat nickel laterite ore is leaching under high temperature (230-260°C) and high pressure (4-5MPa). The recovery rate of nickel and cobalt is usually 90%-95%, but iron cannot be recovered.
Reduction roasting-ammonia leaching process with reagent NH 3 Recyclable, low consumption, can comprehensively recover nickel, cobalt, iron and other advantages, but the low leaching rate of nickel and cobalt is its main disadvantage
[0003] In summary, the current methods for the treatment of nickel-bearing limonite and the comprehensive utilization of the associated valuable metal elements aluminum, magnesium, and iron in the mineral are not perfect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A comprehensive recycling method for nickel-containing limonite, comprising the steps of:

[0017] The composition of nickel-containing limonite raw materials used: Ni 0.8%, Fe 43%, Co 0.1%, MgO 3.65%, SiO 2 7.7%, CaO 2.1%, Al 2 o 3 6.08%, Cr 1.72%;

[0018] 1) Crushing and grinding the nickel-containing limonite to obtain mineral material, the mineral particle size of which is 70% less than 74 μm;

[0019] 2) Pressure leaching: mix the ore material with nitric acid+sulfuric acid, heat and stir in an autoclave, and perform pressure leaching according to the following process parameters to obtain a leachate; the amount of nitric acid is 1.1 times the theoretical amount (theoretical amount is leaching Ni, Co, MgO, CaO, Al in materials 2 o 3 required amount of nitric acid), leaching temperature 150°C, leaching time 60min, liquid-solid ratio 2:1, oxygen partial pressure 0.10MPa, stirring linear velocity 5m / s; leaching rate: nickel 78%, cobalt 72%, aluminum 82% , mag...

Embodiment 2

[0026] A comprehensive recycling method for nickel-containing limonite, comprising the steps of:

[0027] The composition of nickel-containing limonite used: Ni 1%, Fe 45%, Co 0.1%, MgO 5.42%, SiO 2 6.9%, CaO 3.2%, Al 2 o 3 8.02%, Cr 2.22%.

[0028] 1) Crushing and grinding the nickel-containing limonite to obtain mineral material, the mineral particle size of which is 70% less than 74 μm;

[0029] 2) Pressure leaching: Mix the mineral material with nitric acid + sulfuric acid, heat up and stir in an autoclave, and perform pressure leaching according to the following process parameters to obtain a leach solution; the amount of nitric acid is 1.05 times the theoretical amount, and the leaching temperature is 160°C , leaching time 60min, liquid-solid ratio 2:1, oxygen partial pressure 0.10MPa, stirring linear velocity 5m / s; leaching rate: nickel 85%, cobalt 71%, aluminum 84%, magnesium 96%, iron 0.8%;

[0030] 3) Precipitation of aluminum hydroxide: at normal temperature, ...

Embodiment 3

[0036] A comprehensive recycling method for nickel-containing limonite, comprising the steps of:

[0037] The composition of nickel-containing limonite used: Ni 1.2%, Fe 40%, Co 0.08%, MgO 2.36%, SiO 2 8.7%, CaO 3.2%, Al 2 o 3 5.1%, Cr 2.46%.

[0038] 1) Crushing and grinding the nickel-containing limonite to obtain mineral material, the mineral particle size of which is 70% less than 74 μm;

[0039]2) Pressure leaching: Mix the mineral material with nitric acid + sulfuric acid, heat up and stir in an autoclave, and perform pressure leaching according to the following process parameters to obtain a leach solution; the amount of nitric acid is 1 times the theoretical amount, and the leaching temperature is 180°C , leaching time 30min, liquid-solid ratio 2:1, oxygen partial pressure 0.10MPa, stirring linear velocity 5m / s; leaching rate: nickel 85%, cobalt 72%, aluminum 80%, magnesium 92%, iron 0.6%;

[0040] 3) Precipitating aluminum hydroxide: at normal temperature, add C...

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Abstract

The invention discloses a comprehensive recycling method for a limonite containing nickel, which is characterized by including the following steps: pressurizing and leaching are carried out on the ore material particles of the limonite containing nickel by using a mixed liquid of vitriol and nitric acid as a medium so as to prepare a leaching liquid; aluminum hydroxide, nickel hydroxide, cobalt hydroxide and magnesium hydrate are respectively deposited through using CaO or lime hydrate as a neutralizing agent and controlling the different pH values of the leaching liquid. The method realizes the comprehensive utilization of nickel, cobalt, aluminum, magnesium and iron in the limonite containing nickel; a pressurizing and leaching technique is adopted in a vitriol plus nitric acid medium; the leaching temperature and the leaching pressure are low, wherein, the iron is deposited into the slag in a hematite form, thus effectively inhibiting the leaching of the iron; the settlement performance of a soaked ore slurry is good; liquid-solid separation is easy; the CaO or the lime hydrate is adopted for depositing the aluminum, nickel, cobalt and magnesium by steps; and the leaching agent of the nitric acid can be recycled. The method has the advantages of high operating factor of resources, low energy consumption, environment friendliness, and the like.

Description

technical field [0001] The invention relates to a method for recycling nickel-containing limonite, in particular to a method for comprehensive recycling of nickel-containing limonite. Background technique [0002] The traditional laterite nickel ore extraction techniques include: 1) rotary kiln drying pre-reduction-electric furnace reduction smelting to produce ferronickel; 2) sintering-blast furnace vulcanization smelting to produce low nickel matte; 3) sintering-blast furnace reduction smelting to produce nickel pig iron; 4) adding Press acid leaching and reduction roasting-ammonia leaching, etc. Rotary kiln drying pre-reduction-electric furnace reduction smelting is a classic process for processing nickel laterite ore. The process is as follows: Nickel laterite ore with a water content of about 30% is dried, dehydrated and pre-reduced at 800-900°C in a rotary kiln before being sent to the ore. Thermoelectric furnace, reducing and smelting at a high temperature of about 1...

Claims

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Application Information

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IPC IPC(8): C22B3/06
CPCY02P10/20
Inventor 董书通王成彦赵平
Owner ZHENGZHOU YONGTONG SPECIAL STEEL
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