Method for extracting scandium from nickel laterite ores

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

Active Publication Date: 2015-06-24
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 ores
  • Method for extracting scandium from nickel laterite ores
  • Method for extracting scandium from nickel laterite ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The main element content of a lateritic nickel ore is shown in Table 1

[0091] Table 1 Main element content of laterite nickel ore

[0092] unit

[0093] Among them, the content of iron is 13745.2 times that of scandium.

[0094] 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.

[0095] Table 2 Contents of main elements in the pressurized leaching solution of lateritic nickel ore

[0096] unit

[0097] 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 a scandium-rich precipitate, iron, aluminum and calcium and other elements Co-precipitation, its main element content is shown in Table 3. Among them, the content of iron is 134.4 ...

Embodiment 2

[0118] 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 a scandium-rich precipitate, Its main element content is 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 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.

[0119] Table 8 Main element content of scandium-rich precipitate

[0120]

[0121] The above-mentioned scandium-rich precipitate is subjected to the first-stage leaching treatment of the two-stage countercurrent leaching trea...

Embodiment 3

[0128] 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 ores. The method includes carrying out leaching treatment on the nickel laterite ores by the aid of sulfuric acid to obtain leach liquor of the nickel laterite ores; carrying out scandium-rich precipitation treatment on the leach liquor of the nickel laterite ores by the aid of first precipitants to obtain scandium-rich precipitates; carrying out two-stage counter-current leaching treatment on the scandium-rich precipitates; carrying out scandium extraction enrichment treatment on first-stage leach liquor by the aid of first organic extracting agents to obtain organic phases with the scandium and raffinate; carrying out back-extraction treatment on the organic phases with the scandium by the aid of hydrochloric acid; carrying out extraction purification treatment on water phases with the scandium by the aid of second organic extracting agents and obtaining purified water phases with the scandium; mixing the purified water phases with the scandium and second precipitants with one another to obtain precipitation with the scandium; calcining the precipitation with the scandium to obtain scandium oxide. The first-stage leach liquor is obtained by means of two-stage counter-current leaching treatment. The water phases with the scandium are obtained by means of back-extraction treatment. The method has the advantage that the recovery rate can be effectively increased when the scandium is extracted from the nickel laterite ores by the aid of the method.

Description

technical field [0001] The invention relates to the field of metallurgy. In particular, the invention relates to methods of processing lateritic nickel ore and methods of recovering 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, magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/08
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
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