Method for preparing ferronickel alloy utilizing low-grade laterite nickel ore

A technology of laterite nickel ore and nickel-iron alloy, which is applied in the field of preparation of nickel-iron alloy to achieve the effect of low energy consumption and low cost

Inactive Publication Date: 2019-02-19
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low-grade silicon-magnesium laterite nickel ore in the prior art, the present invention provides a method for preparing nickel-iron alloy by utilizing low-grade laterite nickel ore. In the present invention, ferronickel concentrate is added to low-grade laterite nickel ore as a nucleating agent In the ore powder, add reducing agent and sodium salt promoter at the same time and carry out reduction roasting, the fine particles of the reduced nickel-iron alloy will migrate and enrich to the nickel-iron nucleation area under the action of the interface energy, so that the nickel-iron particles grow up, which is beneficial to Magnetic separation to further increase the recovery rate of nickel and iron

Method used

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  • Method for preparing ferronickel alloy utilizing low-grade laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The low-grade laterite nickel ore powder in this example is a certain laterite nickel ore in Yunnan. In terms of mass percentage, the low-grade laterite nickel ore powder contains Ni 0.93%, Fe 11.63%, MgO 28.70%, SiO 2 36.71%;

[0020] like figure 1 Shown, a kind of method utilizing low-grade laterite nickel ore to prepare nickel-iron alloy, concrete steps are as follows:

[0021] (1) The low-grade laterite nickel ore is dried, crushed to a particle size of -0.074mm, accounting for more than 75%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder;

[0022] (2) Mix the low-grade laterite nickel ore powder in step (1), reducing agent A (reducing agent A is coal powder), additive A (additive A is NaCl), and prepare pellets A with a diameter of 40mm, wherein The mass ratio of low-grade laterite nickel ore powder, reducing agent A (coal powder), and additive A (NaCl) is 1:0.07:0.08; at a temperature of 1250°C, pellet A is obtaine...

Embodiment 2

[0025] Example 2: The low-grade laterite nickel ore powder in this example is a certain laterite nickel ore in Yunnan. In terms of mass percentage, the low-grade laterite nickel ore powder contains Ni 0.93%, Fe 11.63%, MgO 28.70%, SiO 2 36.71%;

[0026] like figure 1 Shown, a kind of method utilizing low-grade laterite nickel ore to prepare nickel-iron alloy, concrete steps are as follows:

[0027] (1) The low-grade laterite nickel ore is dried, crushed to a particle size of -0.074mm, accounting for more than 75%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder;

[0028] (2) Mix the low-grade laterite nickel ore powder in step (1), reducing agent A (reducing agent A is coal powder), additive A (additive A is NaCl) and prepare pellets A with a diameter of 20mm, wherein The mass ratio of low-grade laterite nickel ore powder, reducing agent A (coal powder), and additive A (NaCl) is 1:0.1:0.1; at a temperature of 1180°C, pellet A is obtained b...

Embodiment 3

[0031] Example 3: The low-grade laterite nickel ore powder in this example is a certain laterite nickel ore in Yunnan. In terms of mass percentage, the low-grade laterite nickel ore powder contains Ni 1.2%, Fe 9.7%, MgO 31.5%, SiO 2 37.4%;

[0032] like figure 1 Shown, a kind of method utilizing low-grade laterite nickel ore to prepare nickel-iron alloy, concrete steps are as follows:

[0033] (1) The low-grade laterite nickel ore is dried, crushed to a particle size of -0.074mm, accounting for more than 75%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder;

[0034] (2) Combine step (1) low-grade lateritic nickel ore powder, additive A (additive A is Na 2 SO 4 ) mixed evenly and prepared into a pellet A with a ball diameter of 30mm, in which low-grade laterite nickel ore powder, reducing agent A (coal powder), additive A (Na 2 SO 4) with a mass ratio of 1:0.1:0.07; at a temperature of 1230°C and the introduction of reducing agent A (red...

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Abstract

The invention discloses a method for preparing ferronickel alloy utilizing low-grade laterite nickel ore and belongs to the technical field of laterite nickel ore resource utilization. The method comprises the steps that the low-grade laterite nickel ore is dried and crushed till the low-grade laterite nickel ore with the particle size being -0.074 mm accounts for 75% or above, and low-grade laterite nickel ore powder is obtained after screening; the low-grade laterite nickel ore powder, a reducing agent A and an annexing agent A are mixed evenly to be prepared into a pellet A, under the condition of the temperature being 1150-1300 DEG C, the pellet A is subjected to high-temperature reduction roasting to obtain roasted ore, the roasted ore is subjected to water quenching ball milling to obtain ore pulp A, and the ore pulp A is placed in the condition of the magnetic field strength being 120-180 mT to be subjected to magnetic separation to obtain magnetic separation tail ore A and ferronickel concentrate; and the ferronickel concentrate is added in the low-grade laterite nickel ore powder to be mixed evenly, then a reducing agent B and an annexing agent B are added in to be mixed evenly and prepared into a pellet B, under the condition of the temperature being 1150-1300 DEG C, the pellet B is subjected to high-temperature reduction roasting to obtain the roasted ore, the roasted ore is subjected to water quenching ball milling to obtain ore pulp B, and the ore pulp B is placed in the condition of the magnetic field strength being 120-180 mT to be subjected to magnetic separation to obtain magnetic separation tail ore B and the ferronickel alloy.

Description

technical field [0001] The invention relates to a method for preparing ferronickel alloy by using low-grade laterite nickel ore, and belongs to the technical field of laterite nickel ore resource utilization. Background technique [0002] Nickel is an important strategic reserve metal and plays an extremely important role in the development of the national economy. my country's consumption of nickel resources ranks first in the world, but the problem of shortage of nickel resources has become increasingly serious. With the rapid development of my country's stainless steel industry, the demand for nickel continues to increase, and the basic nickel used to produce stainless steel accounts for about 65% of the global basic nickel. In order to cope with the current situation of high cost in the stainless steel production process, it has become an important trend to develop and utilize laterite nickel ore and produce low-cost ferronickel from it. And with the depletion of high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24C22B23/02
CPCC22B1/02C22B1/2406C22B23/023
Inventor 李博聂超群魏永刚王华
Owner KUNMING UNIV OF SCI & TECH
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