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A kind of method for producing nickel-iron alloy in semi-molten state of low-grade laterite nickel ore

A technology of laterite nickel ore and nickel-iron alloy, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of high energy consumption and high cost in the treatment process, and achieve short smelting cycle, reduced energy consumption, and smelting cost control. Effect

Inactive Publication Date: 2016-01-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for producing nickel-iron alloys in the semi-molten state of low-grade laterite nickel ore with lower energy consumption and lower cost, so as to solve the problem of low-grade nickel-iron alloys in the prior art. Problems of high energy consumption and high cost in lateritic nickel ore treatment process

Method used

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  • A kind of method for producing nickel-iron alloy in semi-molten state of low-grade laterite nickel ore
  • A kind of method for producing nickel-iron alloy in semi-molten state of low-grade laterite nickel ore
  • A kind of method for producing nickel-iron alloy in semi-molten state of low-grade laterite nickel ore

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Embodiment 1

[0042] In this embodiment, the method of the present invention is used to process low-grade lateritic nickel ore in a mining area to produce nickel-iron alloy. The main components of the low-grade lateritic nickel ore are shown in Table 1, and the components of coal powder and quicklime used in the production of nickel-iron alloy are shown in Table 2 and Table 3, respectively.

[0043] Table 1 Main components of laterite nickel ore (wt%)

[0044]

[0045] Table 2 Composition of pulverized coal (wt%)

[0046]

[0047] Table 3 quicklime composition (wt%)

[0048]

[0049] In the present embodiment, adopt the method of the present invention, utilize above-mentioned low-grade laterite nickel ore to produce the operation steps of nickel-iron alloy as follows:

[0050] 1) Grind dry laterite nickel ore, coal powder, and quicklime to a powder with particles of -0.074mm accounting for more than 80%.

[0051] 2) Take the laterite nickel ore powder, coal powder, and quicklime...

Embodiment 2

[0067]The present embodiment still adopts the method of the present invention to process the low-grade lateritic nickel ore of embodiment one to produce ferronickel, but the control parameters are slightly different, and its operation steps are as follows:

[0068] 1) Grind dry laterite nickel ore, coal powder, and quicklime to a powder with particles of -0.074mm accounting for more than 80%;

[0069] 2) The powder mixture formed by uniformly mixing the laterite nickel ore powder, coal powder, and quicklime powder is added to a double-roller briquetting machine, and is pressed with water to form green balls with a diameter of about 30mm; wherein, the amount of water added is the total amount of the powder mixture. 8% of the quality; the mixing ratio of laterite nickel ore powder, coal powder, and quicklime powder in the powder mixture is obtained by theoretical calculation according to the proportioning conditions of the present invention (1) and (2) according to the respective...

Embodiment 3

[0078] The present embodiment still adopts the method of the present invention to process the low-grade lateritic nickel ore of embodiment one to produce ferronickel, but the control parameters are slightly different, and its operation steps are as follows:

[0079] 1) Grind dry laterite nickel ore, coal powder, and quicklime to a powder with particles of -0.074mm accounting for more than 80%.

[0080] 2) Take the laterite nickel ore powder, coal powder, and quicklime powder to form a powder mixture that is uniformly mixed and put it into a double-roller briquetting machine, and add water to press it to form a green ball with a diameter of about 35mm; wherein, the amount of water added is the total amount of the powder mixture. 10% of the quality; the mixing ratio of laterite nickel ore powder, coal powder, and quicklime powder in the powder mixture is obtained by theoretical calculation according to the proportioning conditions of the present invention (1) and (2) according to...

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Abstract

The invention provides a method for producing nickel-iron alloy in a semi-molten state of low-grade laterite nickel ore. The method is reduced at a lower temperature of 1400-1440°C, so that both the slag in the reduction product and the reduced nickel-iron alloy enter the semi-molten state. The molten state, so that the nickel-iron alloy is squeezed out by the slag and aggregated by the interface force between the semi-molten slag and the nickel-iron alloy, so that the nickel-iron alloy particles are mixed in the slag pores after cooling, and in the subsequent steps Slag and iron are separated by magnetic separation, and it is not necessary to heat nickel-iron alloy and slag to a fully molten state that is easy to flow for separation. Therefore, not only the reduction temperature is relatively low, but also the reduction time is only 25 to 35 minutes, compared with Since the lateritic nickel ore treatment process in the prior art needs to be reduced at a high temperature above 1650°C for at least 1 hour, the method of the invention has a short smelting cycle, significantly reduces energy consumption, and effectively controls smelting costs.

Description

technical field [0001] The invention relates to the fields of metallurgical engineering technology and environmental protection and energy saving technology, in particular to a method for producing nickel-iron alloy in a semi-molten state of low-grade laterite nickel ore. Background technique [0002] Nickel (Ni) is a rare and precious metal widely used in aerospace, marine, medical, automotive and civil industries. At present, there are only two kinds of land-based nickel resources available for human development: nickel sulfide ore and laterite nickel ore. The smelting process of laterite nickel ore is divided into pyrotechnic process and wet process. The pyrotechnic process can process laterite nickel ore to produce ferronickel. At present, the pyrometallurgy laterite nickel ore production process of ferronickel in the world includes sintering ore-small blast furnace smelting process, rotary kiln-electric furnace method (RKEF), shaft furnace-electric furnace process, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B5/10C22C19/03B03C1/02
Inventor 吕学伟刘梅刘猛吕学明白晨光
Owner CHONGQING UNIV
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