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Production of a scandium-containing concentrate and subsequent extraction of high-purity scandium oxide therefrom

A concentrate and content technology, which is applied to the improvement of process efficiency, scandium oxide/scandium hydroxide, rare earth metal oxides/hydroxides, etc.

Active Publication Date: 2018-05-11
OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOSTYU OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO TEKHNOLOGICHESKIY TSENTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this known method is that there are several stages, for example in the first stage inorganic compounds containing sulphate and barium chloride are added to the scandium solution to remove impurities and then the scandium hydroxide precipitate is further treated with formic acid

Method used

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  • Production of a scandium-containing concentrate and subsequent extraction of high-purity scandium oxide therefrom
  • Production of a scandium-containing concentrate and subsequent extraction of high-purity scandium oxide therefrom
  • Production of a scandium-containing concentrate and subsequent extraction of high-purity scandium oxide therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] In a carbonator with gas bubbler, steam meter and mixer (V 有效 =30.0m 3 ), scandium is leached from red mud using a soda-bicarbonate solution at a liquid-solid ratio of at least 4, NaHCO in the slurry 3 Content = 80g / dm 3 ~110g / dm 3 , Na 2 CO 3 Content = 45g / dm 3 ~60g / dm 3 , temperature = 80°C to 85°C. The total duration of the leaching process is 3 hours, wherein the slurry contains 97% to 99% (volume) CO 2 The air-gas mixture is inflated.

[0092] Once the general leaching process of scandium is complete, filtering the carbonated mud will produce a native Sc-containing solution with the following chemical composition (g / dm 3 ) is supplied to scandium adsorption extraction and concentration stage: 65.0 Na 2 o 总 ; 97.0 NaHCO 3 ; 50.0 Na 2 CO 3 ;0.007 Al 2 o 3 ;0.012 Sc 2 o 3 ;0.140 TiO 2 ; 0.180 ZrO 2 ;0.020 Fe 2 o 3 ; pH 8.8-9.2 (see Example 2).

[0093] Table 4 shows the parameters according to the claimed invention and the experimental results o...

Embodiment 2

[0102] Under the optimal conditions described in Example 1, a Sc-containing solution was produced in the first stage.

[0103]In the second stage, scandium consists of the following composition (g / dm 3 ) solution is adsorbed onto Lewatit TP-260 phosphorus-containing ion exchanger: 65.0 Na 2 o 总 ; 97.0 NaHCO 3 ; 50.0 Na 2 CO 3 ; Al of 0.007 2 o 3 ; 0.012 Sc 2 o 3 ; 0.140 TiO 2 ; 0.180 ZrO 2 ; 0.020 Fe 2 o 3 ; pH 8.8-9.

[0104] Other equivalent conditions are:

[0105] - The best mode of carbonation and leaching of scandium oxide in red mud;

[0106] - Scandium desorption conditions: eluting solution - 320g / dm 3 ~350g / dm 3 Na 2 CO 3 , the linear feed rate of the solution through the resin layer——0.25m / hour~0.3m / hour, temperature——40℃~45℃; (see Table 3);

[0107] -The precipitation conditions of the Ti-Zr concentrate are as follows: t=70°C to 80°C, pH—10.0 to 10.5, τ=1.0 hour to 1.5 hour (see Table 4);

[0108] -The precipitation conditions of the Sc concentr...

Embodiment 3

[0120] Sc-containing solutions were prepared under the optimal conditions described in Example 1, from which scandium was adsorbed on Lewatit TP-260 ion exchangers under the optimal conditions described in Example 2.

[0121] Table 6 shows the use of Na 2 CO 3 The experimental results of the desorption of scandium from the Lewatit TP-260 ion exchanger phase under countercurrent conditions with the elution solution of , with the following process parameters: Na in the desorption solution 2 CO 3 The concentration, the linear feed rate of the desorption solution through the ion exchange layer and its temperature are at the optimum conditions according to the parameters of the claimed invention and beyond the optimum parameter extremes.

[0122] Table 6

[0123] Experimental results for scandium desorption using a carbonate solution under optimal conditions, all other conditions being equal (see text)

[0124]

[0125] The optimal conditions for scandium desorption are:

...

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Abstract

The invention relates to a technology for producing a scandium-containing concentrate from alumina production waste and obtaining a high-purity scandium oxide. The method comprises leaching red mud with a solution containing a mixture of sodium carbonate and sodium bicarbonate, absorbing scandium from the solution on a phosphorus-containing ion exchanger, and desorbing the scandium with a sodium carbonate solution to obtain commercial-grade reclaimed scandium, from which scandium concentrate is precipitated. Said concentrate contains no less than 15 mass% SC2O3, no more than 3 mass% TiO2, andno more than 15 mass% ZrO2, and the scandium in the concentrate is in the form of a mixture of the hydroxide Sc(OH)3 and the basic salt ScOHCO3*4H2O. A method is also proposed that comprises dissolving a scandium-containing concentrate in sulfuric acid, removing the acid-insoluble precipitate, transforming the scandium into a precipitate, filtering, washing, drying, and sintering to obtain a scandium oxide precipitate. After the acid-insoluble scandium precipitate is removed, the scandium is precipitated from the filtrate, removed by filtration, and washed, the binary salt is dissolved in water, and scandium hydroxide is precipitated with caustic soda. The cake is then transformed into scandium oxalate, removed by filtration, and washed with water, and the scandium oxalate is calcined to obtain scandium oxide with a purity approaching 99 mass%.

Description

technical field [0001] The invention relates to non-ferrous metal smelting, in particular to a method for producing scandium-containing concentrate from alumina production waste and extracting ultra-high-purity scandium oxide therefrom. The method involves extracting scandium from a large tonnage of aluminum production waste called red mud, which falls under hazard class 5 according to existing classifications. Due to the high alkalinity of this waste, the area near its storage site is unsuitable for construction and agriculture. At the same time, demand for trace and rare earth metals is growing. First, scandium has attracted attention as a construction material in rocket and aircraft manufacturing, as well as in the aerospace industry, because its melting temperature is significantly higher than that of aluminum, while it has the same density as aluminum. The addition of scandium metal in amounts tenths of that of aluminum and its alloys improves strength and in some cases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/12C22B3/20C01F17/00C01F17/10C01F17/13C01F17/17C01F17/212C01F17/282
CPCC22B3/12C22B3/20C22B59/00C22B3/42C22B7/006Y02P10/20C01F17/282C01F17/13C01F17/17C01F17/212C01F17/206C01F17/10C01F17/00C01P2006/80
Inventor A·G·苏斯A·B·科济列夫A·V·帕诺夫
Owner OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOSTYU OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO TEKHNOLOGICHESKIY TSENTR
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