Process for recovering nickel-cobalt-iron from nickel oxide ore by roasting and water leaching

A technology of nickel oxide ore and nickel-cobalt-iron, which is applied in the field of hydrometallurgy, can solve the problems of inability to leaching with clear water, high sintering temperature, and many carbon reducing agents, so as to reduce equipment investment, increase chlorination rate, and high recovery rate. Effect

Inactive Publication Date: 2017-03-22
毛黎生 +2
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  • Abstract
  • Description
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Problems solved by technology

However, because this production method adds more carbon reducing agents, the sintering temperature is too high at 1100-1300°C, which exceeds the boiling point of nickel oxide at 973°C, and it is easy to volatilize and chlorinate and segregate, and the volatilized metal chlorides are absorbed by carbon. Reduced to metal insoluble in water, difficult to leach with water
[0007] The Chinese doctoral dissertation database 20101231 published a paper on the process and basic research on the extraction of nickel and cobalt in laterite ore by Li Jinhui et al., which published a paper on the process and basic research of nickel and cobalt in laterite ore. effect, but acidified water with a pH of 1 must be used for leaching, and it cannot be leached directly with clean water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition of nickel oxide ore contains (weight%): Ni 1.45%, Fe 14.5%, CO 0.08%, MgO 18.5%, SiO 35.7%, CaO 0.3%, Al 2 o 3 6.08%, Cr 1.02%.

[0037] The nickel oxide ore and coke powder are crushed and ball milled respectively, and the fineness after ball milling is 100 mesh.

[0038] Chlorination roasting conditions: add 10% ammonium chloride, 10% sodium chloride and 2% coke powder according to the weight of nickel oxide ore and stir evenly, roasting temperature is 800°C, roasting time is 1 hour, and cooled to 150°C.

[0039] Leaching conditions: the weight ratio of clean water to nickel oxide ore powder is 3:1, the leaching temperature is 85°C, the leaching time is 60 minutes, and the linear stirring speed is 4.5m / s. Leaching rate: nickel 90%, cobalt 85%, iron 15%.

[0040] Co-precipitation conditions for the mixture of nickel-cobalt-iron compounds: add calcium hydroxide slurry, neutralize the precipitation temperature at 60°C, react for 60 minutes, and contro...

Embodiment 2

[0042] The nickel oxide ore composition used contains (weight%): Ni 1.65%, Fe 16.3%, Co 0.07%, MgO 15.8%, SiO 2 : 41.2%, CaO 0.2%, Al 2 o 3 5.28%, Cr 0.92%.

[0043] The nickel oxide ore and coke powder are crushed and ball milled respectively, and the fineness after ball milling is 100 mesh.

[0044] Chlorination roasting conditions: Add 20% aluminum chloride, 5% sodium chloride and 2% coke powder according to the weight ratio of nickel oxide ore and stir evenly. The roasting temperature is 850°C, the roasting time is 2 hours, and cooled to 200°C.

[0045] Leaching conditions: the weight ratio of clean water to nickel oxide ore powder is 3:1, the leaching temperature is 85°C, the leaching time is 60 minutes, and the linear stirring speed is 5m / s. Leaching rate: nickel 88%, cobalt 76%, iron 54%.

[0046]Co-precipitation conditions for the mixture of nickel-cobalt-iron compounds: add calcium hydroxide slurry, neutralize the precipitation temperature at 60° C., react for 60...

Embodiment 3

[0048] In the nickel oxide ore composition (weight %): Ni 1.82%, Fe 13.5%, CO 0.08%, MgO 16.5%, SiO 2 38.2%, CaO 0.32%, Al 2 o 3 4.57%, Cr 1.15%.

[0049] The nickel oxide ore and coke powder are crushed and ball milled respectively, and the fineness after ball milling is 120 mesh.

[0050] Chlorination roasting conditions: add 10% sodium chloride, 10% magnesium chloride and 2% coke powder according to the weight ratio of nickel oxide ore, roasting temperature is 900°C, roasting time is 3 hours, and cooled to 150°C.

[0051] Leaching conditions: the weight ratio of clean water to nickel oxide ore powder is 3:1, the leaching temperature is 90°C, the leaching time is 45 minutes, and the linear stirring speed is 5m / s. Leaching rate: nickel 80%, cobalt 66.5%, iron 56%.

[0052] Co-precipitation conditions for the mixture of nickel-cobalt-iron compounds: add calcium hydroxide slurry, neutralize the precipitation temperature at 70° C., react for 75 minutes, and control the end...

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Abstract

The invention relates to a process for recovering nickel, cobalt and iron from nickel oxide ores by virtue of roasting and water leaching. The process comprises the following steps: A, performing crushing and ball milling on nickel oxide ores and coke powder, respectively; B, chlorinating and roasting the nickel oxide ores; C, preparing a water leaching liquid for the chlorinated and roasted nickel oxide ores; D, producing a mixture product containing nickel, cobalt and iron compounds. The produced mixture product containing nickel, cobalt and iron compounds is low in sulfur content and high in nickel grade, and can be applied to producing stainless steel. Compared with a traditional wet treatment process of the nickel oxide ores, the process for recovering nickel, cobalt and iron from nickel oxide ores by virtue of roasting and water leaching is a process which is high in comprehensive utilization efficiency of resources, low in energy consumption, environmentally friendly, and easy to implement.

Description

technical field [0001] The invention relates to hydrometallurgy, in particular to a process for recovering nickel-cobalt-iron from nickel oxide ore by roasting and water leaching. Background technique [0002] Nickel oxide ore is usually a symbiotic mineral containing a variety of metal elements. Contains iron, nickel, cobalt, manganese, aluminum and magnesium. In order to recycle these valuable metal elements, methods such as pyrometallurgy and hydrometallurgy have been adopted. [0003] The traditional pyrometallurgical treatment technologies of nickel oxide ore include rotary kiln drying pre-reduction-electric furnace reduction smelting to produce ferronickel; sintering-blast furnace sulfidation smelting to produce low matte nickel; and sintering-blast furnace reduction smelting to produce nickel pig iron. Rotary kiln drying pre-reduction-electric furnace reduction smelting is a classic process for processing nickel oxide ore. This method has the characteristics of stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B3/04C22B3/44C22B23/00C21B15/00
CPCC22B1/08C22B3/04C22B3/44Y02P10/20
Inventor 毛黎生赵明会毛耐文
Owner 毛黎生
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