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Method for extracting scandium from nickel laterite ore

A laterite nickel ore and extraction technology, applied in the field of metallurgy, can solve problems such as unstable recovery of scandium

Active Publication Date: 2015-08-26
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In follow-up research, the applicant found that the patented technology can achieve good results in small-scale experiments, but the effect of recovering scandium in larger-scale experiments is not stable

Method used

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  • Method for extracting scandium from nickel laterite ore
  • Method for extracting scandium from nickel laterite ore
  • Method for extracting scandium from nickel laterite ore

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0100] The main element content of a lateritic nickel ore is shown in Table 1

[0101] Table 1 Main element content of laterite nickel ore

[0102] unit

[0103] Among them, the content of iron is 13745.2 times that of scandium.

[0104] Using sulfuric acid at 250 °C and 0.5 MPa to perform pressure leaching treatment on laterite nickel ore, the main element contents of the obtained pressurized leachate are shown in Table 2.

[0105] Table 2 Contents of main elements in the pressurized leaching solution of lateritic nickel ore

[0106] unit

[0107] Add a mixture of 50% lime and 50% limestone to the pressurized leaching solution of lateritic nickel ore, adjust the pH of the solution to 4.5, and the temperature is 70°C, so that scandium in the pressurized leaching solution forms the first scandium-rich precipitate, iron, aluminum and calcium and other elements co-precipitate, and its main element content is shown in Table 3. Among them, the content of iron...

Embodiment 2

[0126] Add a mixture of 70% lime and 30% limestone to the pressurized leaching solution of laterite nickel ore, adjust the pH value of the pressurized leaching solution of laterite nickel ore to 6.0, and the temperature is 90 degrees Celsius, so that the scandium element in the pressurized leaching solution forms the first scandium-rich precipitate The contents of the main elements are shown in Table 8. Among them, the content of iron is 82.2 times that of scandium. Scandium is co-precipitated with calcium, iron, aluminum, silicon and other elements. The content of scandium in the above-mentioned first scandium-rich precipitate is 0.072%. Compared with laterite nickel ore, scandium is enriched by about 23 times, and it is separated from nickel and cobalt at the same time.

[0127] Table 8 Main element content of the first scandium-rich precipitate

[0128]

[0129] The above-mentioned first scandium-rich precipitate is subjected to the first-stage leaching treatment of the...

Embodiment 3

[0139] With a section of leaching solution shown in Table 4, adjust the pH value to 3.0, according to the water phase: organic phase volume ratio=5:1, add 20% (v / v) carboxylic acid extractant CA12 (sec-octylphenoxyacetic acid) The kerosene solution is subjected to 8-stage scandium extraction and enrichment treatment, the extraction rate of scandium is 98.9%, the extraction rate of iron is 16.5%, the extraction rate of nickel and cobalt is close to 0, the extraction rate of manganese is 0.4%, and the extraction rate of magnesium 0.3%. Then the organic phase containing scandium is washed with 0.03mol / L sulfuric acid solution for 10 stages according to the water phase: organic phase volume ratio = 1:2, and most of the extracted impurities such as iron, nickel, cobalt, manganese, and magnesium are washed off, while scandium remains in the organic phase. Scandium is thus separated from impurities and enriched in the organic phase. The above-mentioned washed scandium-containing or...

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Abstract

The invention provides a method for extracting scandium from nickel laterite ore. The method comprises the steps that sulfuric acid is utilized for carrying out leaching treatment on the nickel laterite ore, and a nickel laterite ore leaching agent is obtained; first scandium-rich sedimentation treatment is carried out on the nickel laterite ore leaching agent, and first scandium-rich sediment is obtained; two-segment countercurrent leaching treatment is carried out on the first scandium-rich sediment; a second precipitation agent is utilized for carrying out second scandium-rich sediment treatment on one segment of leaching agent; the sulfuric acid is utilized for carrying out leaching treatment on second scandium-rich sediment so as to obtain a scandium-rich leaching agent; a first organic extractant is utilized for carrying out scandium extraction enrichment treatment on the scandium-rich leaching agent so as to obtain an organic phase and an extraction raffinate which contain scandium; hydrochloric acid is utilized for carrying out reextraction treatment on the organic phase containing the scandium; a second organic extraction agent is utilized for carrying out extraction purification treatment on a scandium-contained aqueous phase obtained through reextraction treatment; the purified scandium-contained aqueous phase is mixed with a third precipitating agent so as to obtain scandium-contained sediment; and the scandium-contained sediment is calcined to obtain scandium oxide.

Description

technical field [0001] The invention relates to the field of metallurgy. In particular, the invention relates to methods of processing lateritic nickel ores and methods of extracting scandium. 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, aluminum, manganese, mag...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/08C22B3/26C22B3/46
CPCY02P10/20
Inventor 王玮玮吕东唐建文邱爽刘国杜国山覃波
Owner CHINA ENFI ENGINEERING CORPORATION