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Scandium element extraction method

A scandium element and extraction technology, which is applied in the field of rare earth hydrometallurgy, can solve the problems of scandium recovery and purification processes that have not seen major innovations.

Active Publication Date: 2017-05-24
王艳良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, scandium recovery and purification processes have not seen major innovations
The Chinese patent with the application number 02128346.X discloses a process for enriching and preparing high-purity scandium from a scandium-containing rare earth chloride solution by using alkoxy instead of acetic acid as an extractant and mixed alcohol as an additive. However, the process for the separation of scandium The selectivity is only around 400

Method used

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Experimental program
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Embodiment 1

[0053] The analysis of rare earth elements adopts the ICP-MS method (refer to GB / T 18114.8-2010 Chemical Analysis Methods of Rare Earth Concentrates, Part 8, Determination of 15 Rare Earth Element Oxides).

[0054] When the volume of the aqueous phase and the organic phase are equal, the calculation formulas for the extraction rate E, distribution ratio D, and separation coefficient β are as follows:

[0055] Extraction rate E=(C total -C aq ) / C total ;

[0056] Distribution ratio D=E / (1-E);

[0057] Separation coefficient β=D RE1 / D RE2 .

[0058] Synthesis and characterization of extractant: using o-chlorophenoxyacetic acid and 3,5,5-trimethylhexanol as raw materials, o-3,5,5-trimethylhexanol was prepared by Williamson reaction Phenyloxyacetic acid (code name ROBOA-1), its purity was measured to be 98%, and its pKa value was 4.80.

[0059] Prepare the organic phase: take 20 mL of o-3,5,5-trimethylhexyloxyphenoxyacetic acid (code ROBOA-1) extractant, 10 mL of tributyl...

Embodiment 2

[0065] Prepare the organic phase: Dissolve 100mL of commercial m-2,4,4-trimethylpentyloxyphenoxyacetic acid (code ROBOA-2) extractant in toluene, 100mL of tributyl phosphate (TBP), And dilute to 1000mL, the volume concentration of extractant is 10% at this moment.

[0066] Preparation of raw material solution: take tungsten slag leaching solution and adjust it into scandium-containing mixed rare earth solution, its composition is: scandium 54ppm, pH value is 3. The main impurities are iron, aluminum, titanium, zirconium and rare earth.

[0067] Fractional extraction: The whole extraction process uses a separatory funnel array for fractional extraction, including 4-stage extraction, 2-stage washing and 2-stage stripping. The organic phase is added from the first stage; the scandium-containing mixed rare earth solution is added from the fourth stage; the washing solution is 0.2 mol / liter nitric acid, which is added from the sixth stage; the stripping acid is 2.0 mol / liter nitri...

Embodiment 3

[0069] Prepare the organic phase: take 500mL of commercialized p-n-nonyloxyphenoxypropionic acid (code ROBOA-3) extractant and dissolve it in 260# solvent oil (purchased from Luoyang Aoda Chemical Co., Ltd.), TBP200mL, And dilute to 2000mL, the volume concentration of extractant is 25% at this moment. Add 37.5 milliliters of concentrated ammonia water for saponification, and the degree of saponification is 70%.

[0070] Prepare the raw material solution: take crude scandium with a grade of 35%, dissolve it with nitric acid, and adjust it into a mixed rare earth solution containing scandium. The main impurities are rare earths.

[0071] Fractional distillation extraction: The whole extraction process uses a mixed-settler tank for fractional distillation extraction, including 6-stage extraction, 4-stage washing and 3-stage stripping. The organic phase is added from the first stage; the scandium-containing mixed rare earth solution is added from the sixth stage; the washing sol...

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Abstract

Theinvention provides a scandium element extraction method. The scandium element extraction method comprises the following steps of: (A) mixing alkoxy phenoxy carboxylic acid, tributyl phosphate and a diluting agent to obtain an organic phase; and (B) extracting a scandium-containing mischmetal solution by using the organic phase to obtain a scandium ion-containing solution. The scandium element extraction method has the beneficial effects that the separation selectivity between the scandium element and other rare earth elements can be effectively improved by adopting the alkoxy phenoxy carboxylic acid as the extraction agent on the basis of ensuring the purity of a scandium product and relatively high yield; the concentration of the organic phase is effectively prevented from decreasing after extraction by adopting the tributyl phosphate as an additive, so that the organic phase can be recycled; meanwhile, an emulsion phenomenon in an extraction process can be avoided; and experimental results show that the separation coefficients of the scandium element and a lanthanide element are 526 due to adoption of the scandium element extraction method.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to an extraction method of scandium element. Background technique [0002] Scandium is known as the "God of Light" and can be used in many high-tech fields, such as aluminum-scandium alloys, optoelectronics, energy materials, and catalysis. The abundance of scandium in the earth's crust is 22-30ppm, ranking fifth among rare earths after lanthanum, cerium, neodymium, and yttrium, and richer than common metals such as gold, silver, and lead. However, the distribution of scandium is sparse, and there are very few independent mineral deposits. There are only a few types such as scandium yttrium stone, which are mainly associated with bauxite, tungsten ore, titanium ore, vanadium ore, uranium ore and so on. my country has abundant scandium resources, such as Inner Mongolia Baiyun Obo Rare Earth Mine, Sichuan Panzhihua Vanadium-Titanium Magnetite Mine, Jiangxi Tungsten Mine, Gua...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/26
CPCY02P10/20
Inventor 王艳良
Owner 王艳良
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