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Method for promoting growth of ferronickel alloy particles in process of producing ferronickel from laterite-nickel ore

A technology of lateritic nickel ore and nickel-iron alloy, applied in chemical instruments and methods, magnetic separation, solid separation, etc., to achieve the effect of high recovery rate

Inactive Publication Date: 2022-02-11
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the beneficiation problem of the existing low-grade silicon-magnesium type laterite nickel ore, and proposes a method for promoting the growth of ferronickel alloy particles in the process of producing ferronickel from laterite nickel ore. The present invention uses ferronickel powder as a nucleating agent to add In the low-grade laterite nickel ore powder, the reducing agent and the sodium salt promoter act synergistically during the reduction roasting process to promote the formation and aggregation of ferronickel, which is beneficial to the magnetic separation process and obtain high-grade and high-recovery nickel iron

Method used

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  • Method for promoting growth of ferronickel alloy particles in process of producing ferronickel from laterite-nickel ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The low-grade laterite nickel ore powder composition of this embodiment contains Ni 0.82%, Fe9.67%, MgO 31.49%, SiO 2 37.37%, Al 2 o 3 1.89%;

[0021] A method for promoting the growth of nickel-iron alloy particles in the process of producing ferronickel from laterite nickel ore (see figure 1 ),Specific steps are as follows:

[0022] (1) Low-grade lateritic nickel ore and additive A (blast furnace nickel-iron) were dried and crushed to a particle size of -0.074mm, accounting for more than 80%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder and additive powder A (blast furnace nickel iron powder);

[0023] (2) Combine low-grade laterite nickel ore powder, reducing agent (anthracite powder), additive powder A (blast furnace nickel-iron powder) and additive B (Na 2 CO 3 ) mixed evenly, heated to 1200°C at a uniform speed and subjected to high-temperature reduction roasting for 85 minutes to obtain roasted ore, whic...

Embodiment 2

[0026] Embodiment 2: The low-grade laterite nickel ore powder composition of this embodiment contains Ni 0.8%, Fe9.7%, MgO 31.5%, SiO 2 37.4%, Al 2 o 3 1.9%;

[0027] A method for promoting the growth of nickel-iron alloy particles in the process of producing ferronickel from laterite nickel ore (see figure 1 ),Specific steps are as follows:

[0028] (1) Low-grade lateritic nickel ore and additive A (blast furnace nickel-iron) were dried and crushed to a particle size of -0.074mm, accounting for more than 80%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder and additive powder A (blast furnace nickel iron powder);

[0029] (2) Combine low-grade lateritic nickel ore powder, reducing agent (coke), additive powder A (blast furnace ferronickel powder) and additive B (Na 2 CO 3 ) mixed evenly, heated to 1250°C at a uniform speed and subjected to high-temperature reduction roasting for 70 minutes to obtain roasted ore, which was naturally c...

Embodiment 3

[0032] Embodiment 3: The low-grade laterite nickel ore powder composition of this embodiment contains Ni 1.1%, Fe9.4%, MgO 28.7%, SiO 2 35.6%, Al 2 o 3 2.0%;

[0033] A method for promoting the growth of nickel-iron alloy particles in the process of producing ferronickel from laterite nickel ore (see figure 1 ),Specific steps are as follows:

[0034] (1) Low-grade laterite nickel ore and additive A (electric furnace nickel-iron) were dried and crushed and ground to a particle size of -0.074mm, accounting for more than 80%, and passed through a 200-mesh sieve to obtain low-grade laterite nickel ore powder and additive powder A (electric furnace nickel iron powder);

[0035] (2) Combine low-grade lateritic nickel ore powder, reducing agent (graphite powder), additive powder A (electric furnace nickel-iron powder) and additive B (Na 2 CO 3 ) mixed evenly, heated to 1230°C at a uniform speed and subjected to high-temperature reduction roasting for 90 minutes to obtain roas...

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Abstract

The invention relates to a method for promoting growth of ferronickel alloy particles in the process of producing ferronickel from laterite-nickel ore, and belongs to the technical field of laterite-nickel ore resource utilization. The method comprises the following steps of: respectively drying, crushing and grinding low-grade laterite-nickel ore and an additive A until power with the granularity of -0.074 mm accounts for more than 80%, and sieving to obtain low-grade laterite-nickel ore powder and additive powder A, the additive A being blast furnace ferronickel or electric furnace ferronickel; well mixing the low-grade laterite-nickel ore powder, a reducing agent, the additive powder A and an additive B, heating to 1200-1350 DEG C at a constant speed, carrying out high-temperature reduction roasting to obtain roasted ore, naturally cooling the roasted ore, and carrying out wet grinding to obtain ore pulp, the additive B being sodium salt; and performing magnetic separation on the ore pulp to obtain magnetic separation tailings and ferronickel alloy. According to the method, ferronickel powder serving as a nucleating agent is added into the low-grade laterite-nickel ore powder and cooperates with the reducing agent and the sodium salt accelerant in the reduction roasting process to promote formation, aggregation and growth of ferronickel, the magnetic separation process is facilitated, and high-grade and high-recovery-rate ferronickel is obtained.

Description

technical field [0001] The invention relates to a method for promoting the growth of ferronickel alloy particles in the process of producing ferronickel from laterite nickel ore, and belongs to the technical field of resource utilization of laterite nickel ore. Background technique [0002] Laterite nickel ore is a surface weathered crust deposit formed by weathering-leaching-deposition of nickel sulfide ore rock mass. Nickel in lateritic nickel ore mainly exists in the form of isomorphism instead of magnesium in serpentine, which is difficult to be enriched by ordinary beneficiation technology. host. The production cost of PAL wet technology is lower than that of pyrometallurgy ferronickel technology, and the energy consumption is also lower than that of pyrometallurgy process. At present, many enterprises in the west adopt PAL wet technology to process laterite nickel ore, while most of our country still use pyrometallurgy technology. Production of ferronickel. These me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02B03C1/30
CPCC22B23/023C22B23/005B03C1/30
Inventor 李博王源波魏永刚王华
Owner KUNMING UNIV OF SCI & TECH
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