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Method for gathering nickel and iron from laterite-nickel ores

A laterite nickel ore enrichment technology, which is applied in the field of nickel laterite ore and low-grade laterite nickel ore to enrich nickel and iron, can solve the problems of retention, large difference in energy consumption cost, and unstable process technology, etc.

Active Publication Date: 2012-03-14
SHENYANG RES INST OF NONFERROUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, more than 80% of the energy consumption of electric furnace smelting in pyrotechnics is provided by electric energy, and the power consumption per ton of ore is 560-600kwh.
However, there are still many problems in this process. Although the Dajiangshan Smelter has been improved many times, the process technology is still not stable enough. After decades of production, its production scale still remains at about 10,000 tons of nickel per year.

Method used

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  • Method for gathering nickel and iron from laterite-nickel ores
  • Method for gathering nickel and iron from laterite-nickel ores
  • Method for gathering nickel and iron from laterite-nickel ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The lateritic nickel ore from the Philippines was used for verification. After the raw ore sample was dried, it was crushed by a closed-circuit crushing process consisting of a jaw crusher, a roller crusher and a -2.5mm sieve. The crushed product was homogenized, fractionated and sampled. The results of multi-component chemical analysis of raw ore are shown in Table 1.

[0048] Table 1 raw ore multi-component chemical analysis results (%)

[0049]

[0050] Nickel extraction test and results

[0051] Test method: Crush laterite nickel ore and anthracite coal powder to -2.0mm, and mix evenly according to the ratio of ore and coal powder 100:20. Spread a layer of 5mm coal powder on the bottom of the rotary hearth furnace, and then spread the mixed mineral powder and coal powder on it for reduction. The thickness of the material layer is 40mm, and the mixed material surface is covered with a 4mm thick protective coal layer. The reduction temperature is 1275°C, and the...

Embodiment 2

[0057] For the above-mentioned laterite nickel ore sample, the laterite nickel ore and anthracite coal powder were crushed to -3.0mm, and mixed evenly according to the ratio of ore and coal powder 100:20. Spread a layer of 5mm coal powder on the bottom of the rotary hearth furnace, and then spread the mixed mineral powder and coal powder on it for reduction. The thickness of the material layer is 40mm, and the mixed material surface is covered with a 4mm thick protective coal layer. The reduction temperature is 1300°C, and the reduction time is 1.0 hour. After the reduction product is cooled, use a magnetic separator to remove excess protective coal in the protective coal seam, and recycle it for reuse. The magnetic separator concentrate is finely ground and then magnetically separated to obtain a mixed product of nickel metal and iron metal.

[0058] Test results: The test results are shown in Table 3.

[0059] Table 3 test results, %

[0060] serial number samp...

Embodiment 3

[0063] For the above-mentioned laterite nickel ore sample, the laterite nickel ore and anthracite coal powder were crushed to -2.5mm, and mixed evenly according to the ratio of ore and coal powder 100:25. No pulverized coal is spread on the bottom of the rotary hearth furnace, and then the mixed pulverized ore and pulverized coal are directly placed in the reduction box for reduction. The thickness of the material layer is 30mm, and the surface of the mixed material is covered with a 4mm thick protective coal layer. The reduction temperature is 1275°C, and the reduction time is 50 minutes. After the reduction product is cooled, use a magnetic separator to remove excess protective coal in the protective coal seam, and recycle it for reuse. The concentrate of the magnetic separator is finely ground and then subjected to two-stage magnetic separation to obtain a mixed product of nickel metal and iron metal.

[0064] Test results: The test results are shown in Table 4.

[0065] ...

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Abstract

The invention discloses a method for gathering nickel and iron from laterite-nickel ores. The method for gathering nickel and iron from laterite-nickel ores is characterized by comprising the following steps of 1, drying laterite-nickel ores, crushing the dried laterite-nickel ores into laterite-nickel ore powder having particle sizes of 2 to 10 millimeters, and crushing coal into coal powder having particle sizes of 2 to 10 millimeters, 2, uniformly mixing the laterite-nickel ore powder and the coal powder according to a weight part ratio of (5 to 50): 100, 3, putting the mixture into a reduction heating furnace, heating to a temperature of 1050 to 1400 DEG C, keeping for 30 to 90 minutes, and cooling, 4, grinding when the mixture is cooled to normal temperature, wherein grinded products have particle sizes less than 0.1 millimeters, 5, carrying out magnetic separation, removing tailings obtained by the magnetic separation, feeding back middlings obtained by the magnetic separation for re-reduction, controlling a grade of nickel in concentrates obtained by the magnetic separation in a range of 4 to 8% so that recovery rates of nickel and cobalt are greater than 90%, and feeding the concentrates as raw materials into an electric furnace nickel smelting system or carrying out wet leaching of the concentrates, and 6, carrying out comprehensive recovery of nickel and cobalt. The method for gathering nickel and iron from laterite-nickel ores can realize a laterite-nickel ore enrichment ratio of 4 to 8% in a non-bonded raw material state, remove a part of tailings, and improve a recovery rate through feeding back of middlings obtained by magnetic separation.

Description

technical field [0001] The invention relates to a method for processing nickel laterite ore, in particular to a method for enriching nickel and iron from low-grade laterite nickel ore, which belongs to the technical field of mineral processing engineering. Background technique [0002] Laterite nickel deposits are nickel-bearing peridotites that have undergone large-scale long-term weathering and leaching metamorphism in tropical or subtropical regions. They are loose clay-like ores composed of iron, aluminum, silicon and other hydrous oxides. Due to the oxidation of iron, the ore is red, so it is called laterite. [0003] At present, there are two types of processes for processing laterite nickel ore in industry: fire process and wet process. [0004] fire craft [0005] The process of pyroprocessing laterite nickel ore is divided into reduction smelting process to produce ferronickel and reduction sulphurization smelting process to produce nickel matte according to the d...

Claims

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Application Information

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IPC IPC(8): C22B1/00
CPCY02P10/20
Inventor 李艳军尹文新韩跃新
Owner SHENYANG RES INST OF NONFERROUS METALS
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