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Method for processing limonite lateritic nickel

A technology of lateritic nickel ore and limonite, which is applied in the field of processing limonite-type lateritic nickel ore to recover iron, nickel and cobalt, and can solve the problems of high impurity content in leachate, no mention of iron recycling, poor control of process operation, etc. Achieve high iron comprehensive utilization rate, reduce the loss of nickel and cobalt, and reduce the consumption of reagents

Active Publication Date: 2012-02-08
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method requires less equipment than the conventional pressure leaching method, and the technology is easy to master, the impurity content in the obtained leaching solution is high, and the subsequent purification process is difficult. In addition, this method does not mention the recycling of iron, and the economy is not good.
[0012] In summary, the above-mentioned processes either have disadvantages such as high equipment investment costs, high operating costs, and complicated process technologies, or have problems such as poor control of process operations and low recovery rates of valuable metals, and have not been able to comprehensively utilize limonite-type Laterite nickel ore

Method used

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  • Method for processing limonite lateritic nickel
  • Method for processing limonite lateritic nickel

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Experimental program
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Effect test

Embodiment 1

[0048] See attached figure 1 . After the original ore is crushed and dry-milled, 80% of the laterite ore with a particle size of less than 74 μm is obtained, and 20% of water is added, and concentrated sulfuric acid with a mass fraction of 98% is added according to the acid amount of 200 kg / t ore, so that the acid and ore After fully mixing, it was aged and roasted at 450°C for 1 h; the cured material was directly soaked in water under normal pressure at a temperature of 60°C for 5 h, a liquid-solid ratio of 3:1 (ml / g), and a stirring speed of 200 rpm. The leaching rate of nickel is 75.3%, the leaching rate of cobalt is 85.1%, and the leaching rate of iron is as low as 0.2%. After dense separation and 5-stage dense washing with a liquid-solid ratio of 4:1 (ml / g), the leaching residue, leaching liquid and washing liquid are obtained ; The leaching slag was mixed with 8% lignite, magnetized and roasted at 800 ℃ for 1 hour, and then water quenched. The water quenched slag was ba...

Embodiment 2

[0050] The raw ore is crushed and wet-milled to obtain a laterite ore with a particle size of less than 74 μm, accounting for 70%, and a water content of 28%. Add concentrated sulfuric acid with a mass fraction of 98% according to the acid content of 300 kg / t ore, so that the acid and ore are fully mixed. , aged and roasted at 600°C for 0.5 h; the cured material was directly soaked in atmospheric pressure water at a temperature of 75°C for 0.5 h, a liquid-solid ratio of 6:1 (ml / g), and a stirring speed of 300 rpm. The nickel leaching rate The leaching rate of cobalt is 75.6%, the leaching rate of cobalt is 85.4%, and the leaching rate of iron is as low as 0.4%. After dense separation and 6-stage dense washing with a liquid-solid ratio of 3:1 (ml / g), the leaching residue, leaching liquid and washing liquid are obtained; the leaching residue Add 5% lignite, magnetize and roast at 750°C for 1.5 h, then water quench, water quench slag ball mill for 30 min, and then perform magnetic...

Embodiment 3

[0052] The raw ore is crushed and wet-milled to obtain laterite ore with a particle size of less than 74 μm, which accounts for 85% and contains 30% water. Add concentrated sulfuric acid with a mass fraction of 98% according to the acid amount of 180 kg / t ore, so that the acid and ore are fully mixed. , aged and roasted at 300°C for 3 h; the cooked material was directly soaked in atmospheric pressure water at a temperature of 90°C for 2 h, a liquid-solid ratio of 1:1 (ml / g), and a stirring speed of 500 rpm. The nickel leaching rate The leaching rate of cobalt is 75.1%, the leaching rate of cobalt is 84.9%, and the leaching rate of iron is as low as 0.1%. After dense separation and 8-stage dense washing with a liquid-solid ratio of 2:1 (ml / g), the leaching residue, leaching liquid and washing liquid are obtained; the leaching residue Add 10% bituminous coal, magnetize and roast at 700°C for 0.5 h, then water quench, water quench slag ball milled for 10 min, then perform magnetic...

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Abstract

The invention discloses a method for processing limonite lateritic nickel, which comprises the following steps of: (1) curing raw ores, i.e. crushing and grinding the raw ores of the limonite lateritic nickel, adding concentrated sulfuric acid, uniformly mixing the concentrated sulfuric acid and the crushed and ground raw ores and carrying out curing roasting to obtain cured materials, wherein the processed ores have the water content of 5 to 30 percent; (2) carrying out selective normal-pressure leaching on the curing materials, i.e. directly carrying out normal-pressure leaching on the cured materials obtained in the step (1) at a stirring rotating speed of 200 to 600rpm, carrying out thickening separation on the leached ore pulp to obtain leachate and leached residues, carrying out thickening washing on the leached residues to obtain washing solution and high-iron residues and returning the washing solution to the water leaching process; and (3) carrying out magnetizing roasting and magnetic separation on the high-iron residues, i.e. adding the high-iron residues obtained in the step (2) into coal of which the weight is 3 to 20 percent of a dry basis of the high-iron residues to carry out magnetizing roasting and carrying out water quenching, ball milling and magnetic separation on the obtained calcine to obtain the iron concentrate with the iron content of over 63 percent.The method has strong process operability, good leaching selectivity and high comprehensive utilization rate of iron.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a method for recovering iron, nickel and cobalt from limonite-type lateritic nickel ore. Background technique [0002] Lateritic nickel ore is formed by long-term weathering and metamorphism of ultramafic rocks containing iron-magnesium silicate minerals (such as olivine, pyroxene, and hornblende). During the long-term weathering process, through uplift and erosion, the composition of the regolith changes, forming the following two types: one is the limonite-type laterite-nickel ore, which has high iron, low nickel, low silicon and magnesium, and low cobalt Higher content and other characteristics, usually treated by wet process; the other is silicon magnesium nickel ore type laterite nickel ore, the content of silicon and magnesium in its minerals is high, the content of iron is low, and the content of cobalt is also low, but the content of nickel...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B1/02C22B3/04C22B26/22
CPCY02P10/20
Inventor 王成彦杨卜尹飞马保中揭晓武阮书锋杨玮娇张永禄陈永强杨永强居中军郜伟邢鹏王军
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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