Treatment method for comprehensively recovering valuable elements from laterite-nickel ore

A technology of laterite nickel ore and a treatment method, which is applied in the field of metallurgy, can solve the problems of difficult extraction, complicated operation and low recovery rate, and achieves the effects of improving leaching efficiency and improving treatment efficiency.

Active Publication Date: 2014-01-01
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention has found that the laterite nickel ore also contains a small amount of scandium element, but the content is less, it is not easy to extract, and the recovery rate is low
The content of iron, aluminum, manganese, magnesium, calcium and other impurities in laterite nickel ore is high, which is much higher than that of scandium, which easily interferes with the extraction of scandium
Existing technologies for extracting scandium have the problems of long process, complicated operation, low output, high consumption of raw and auxiliary materials, and high cost in the production process, and are not suitable for extracting scandium from laterite nickel ore.

Method used

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  • Treatment method for comprehensively recovering valuable elements from laterite-nickel ore
  • Treatment method for comprehensively recovering valuable elements from laterite-nickel ore
  • Treatment method for comprehensively recovering valuable elements from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The element content of a laterite nickel ore is shown in Table 1, wherein the content of scandium is 0.0033%.

[0044] Table 1 Element content of laterite nickel ore and its concentration in high pressure acid leaching solution

[0045] the element

Content in laterite nickel ore (%)

Concentration in pickling solution (g / L)

Ni

1.07

3.85

co

0.1

0.32

Cu

<0.02

0.01

Fe

41.9

1.32

mn

0.653

2.05

Zn

〈0.05

0.11

Pb

〈0.02

<0.001

Si

7.15

0.094

Al

1.83

1.69

Ca

0.157

0.14

Mg

1.98

3.59

Cr

0.5

0.022

sc

0.0033

0.0117

[0046] The above-mentioned laterite nickel ore is leached with sulfuric acid in an autoclave at a temperature of 255 degrees Celsius and a pressure of 5 MPa. Most of the valuable metals scandium (0.0117g / L), nickel (3.85g / L), and cobalt (0.32g / L) enter the hig...

Embodiment 2

[0055] See Table 2 for the element content in a nickel hydroxide cobalt precipitate. Take the above-mentioned scandium hydroxide nickel cobalt precipitate, according to the solid-liquid ratio S:L=1:5, add 20% (mass percentage) sulfuric acid solution, stir and react for leaching, filter, and collect the filtrate. The filtrate mainly contains Ni, Co, Mn, Sc, Fe, Al, Ca.

[0056] Take the above-mentioned scandium hydroxide nickel cobalt sulfuric acid leaching solution, adjust the pH value to 0.5, according to the water phase: organic phase = 5:1, add the kerosene solution containing 10% N235 + 5% N503 to carry out the extraction reaction. The extraction percentage of Sc was 99.8%, and the extraction rates of Ni, Co, Fe, and Al were 0.1%, 0.2%, 1.0% and 0.2%, respectively. The extraction rate of impurities is low and separated from scandium. The loaded organic phase is washed with 5% sulfuric acid solution for 4 stages according to the water phase: organic phase = 2:1, and a sma...

Embodiment 3

[0060] The element content in the sulfuric acid leaching solution of a laterite nickel ore is shown in Table 1. The pH is adjusted to 3.8 with lye, so that the iron and aluminum in the leaching solution form iron and aluminum slag, and the scandium and iron and aluminum impurities are separated. Further, the pH is adjusted to 8.0 with lye, and the nickel-cobalt is precipitated to obtain the nickel-cobalt hydroxide precipitate. Scandium was enriched with the precipitation of nickel and cobalt hydroxide, with a content of 0.139%. The element content is shown in Table 3.

[0061] Table 3 Main element content in nickel hydroxide cobalt precipitation

[0062]

[0063]Take the above-mentioned scandium hydroxide nickel cobalt precipitate, according to the solid-liquid ratio S:L=1:5, add 20% (mass percentage) sulfuric acid solution, stir and react for leaching, filter, collect the filtrate to make the leachate, the filtrate mainly contains Ni, Co, Mn , Ca, Mg, Sc, Fe, Al.

[006...

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Abstract

The invention provides a treatment method of laterite-nickel ore, particularly a treatment method for comprehensively recovering valuable elements from laterite-nickel ore. The treatment method comprises the following steps of: carrying out first leaching treatment on laterite-nickel ore by utilizing sulphuric acid so as to obtain laterite-nickel ore leachate; carrying out first iron-aluminium precipitating treatment and nickel-cobalt precipitating treatment on the laterite-nickel ore leachate so as to respectively obtain first iron-aluminium resides and cobalt nickel hydroxide precipitation; carrying out secondary leaching treatment on the cobalt nickel hydroxide precipitation by utilizing sulphuric acid so as to obtain nickel-cobalt leachate; carrying out scandium extracting treatment on the nickel-cobalt leachate by utilizing an organic extracting agent so as to obtain nickel-cobalt-containing solvent and scandium-containing organic phase; recovering nickel-cobalt from the nickel-cobalt-containing solvent; and recovering scandium from the scandium-containing organic phase. Scandium can be effectively extracted from laterite-nickel ore by utilizing the method disclosed by the invention.

Description

technical field [0001] The invention relates to the field of metallurgy. Specifically, the present invention relates to a treatment method for comprehensive recovery of valuable elements from laterite nickel ore. Background technique [0002] Laterite nickel ore contains a large amount of nickel and cobalt metal elements. Due to the low grade of nickel and cobalt in domestic laterite nickel ore, the raw materials of laterite nickel ore used to produce nickel and cobalt in my country are mainly imported from abroad, and the raw material cost is relatively high. In the past, the domestic treatment of laterite nickel ore was limited to the extraction of nickel and cobalt, ignoring the small amount of other valuable metal elements contained in laterite nickel ore. The present invention finds that the laterite nickel ore also contains a small amount of scandium element, but the content is small, it is difficult to extract, and the recovery rate is low. The content of iron, alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/08C22B3/26C22B23/00
CPCY02P10/20
Inventor 王玮玮吕东徐月和覃波杜国山周文龙李少华邱爽
Owner CHINA ENFI ENGINEERING CORPORATION
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