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Method for producing ferro-nickel alloy from low-grade laterite-nickel ore in half-molten state

A technology of lateritic 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 of the treatment process, and achieve short smelting cycle, low energy consumption and low reduction temperature Effect

Inactive Publication Date: 2014-04-02
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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  • Method for producing ferro-nickel alloy from low-grade laterite-nickel ore in half-molten state
  • Method for producing ferro-nickel alloy from low-grade laterite-nickel ore in half-molten state
  • Method for producing ferro-nickel alloy from low-grade laterite-nickel ore in half-molten state

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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 lateritic 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 quicklim...

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 a ferro-nickel alloy from low-grade laterite-nickel ore in a half-molten state. In the method, reduction is performed at a relatively low temperature of 1,400-1,440 DEG C, the slag in the reduction product and the reduced ferro-nickel alloy are both in a half-molten state, and then the ferro-nickel alloy is pushed by the slag and gathered by use of the phase interface acting force between the slag and ferro-nickel alloy in the half-molten state, so that the ferro-nickel alloy is mixed in the slag pores in a form of ferro-nickel alloy particles after being cooled; in follow-up steps, the slag-iron separation is performed through magnetic separation without heating the ferro-nickel alloy and slag to a full-molten state for easy flowing before separation. Therefore, the reduction temperature is relatively low, and the reduction time is only 25-35 minutes; compared with the laterite-nickel ore treatment process of the prior art needing high temperature over 1,650 DEG C and reduction time of at least one hour, the method provided by the invention has a short smelting cycle, obviously reduces the energy consumption and effectively controls the smelting cost.

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 Applications(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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