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INVENTION
Russian Federation Patent RU2063458
Extractants for scandium extraction
Name of the inventor: Semenov SA .; Slusar IV .; Reznik AM .; Moiseev VV .; Kosovars VV
The name of the patentee: Moscow State Lomonosov Academy of Fine Chemical Technology
Address for correspondence:
Starting date of the patent: 1994.09.29
The invention relates to the hydrometallurgy of rare metals can be used for the extraction of scandium chloride solution, extraction with phenol formaldehyde nitrogen-containing oligomer in an organic solvent. SUMMARY: In an extractant to extract scandium proposed solution nitrogenous n - alkyl (C 8 -C 9) a phenol-formaldehyde oligomer in the aromatic and saturated hydrocarbons with a concentration of 0.05-0.20 mol / l.
DESCRIPTION OF THE INVENTION
The invention relates to the hydrometallurgy of rare metals can be used for the extraction of scandium.
It is known to use 0.1 mol / l solution of acetylacetone (2,4-pentanedione) in benzene as the extractant to extract scandium. The process is carried ive perchlorate solutions having an ionic strength of 0.1 and the concentration of scandium l0 -3 -10 -4 mol / l. pH after extraction of 3,5-9,0. Removing quantitative metal.
A disadvantage of this extractant is that efficient extraction of scandium is achieved only when its content is low in the solution.
The closest to the proposed use of a 0.25 mol / L solution in toluene, n-nitrogenous tretbutilfenolformaldegidnogo resol oligomer (molecular weight 460) as extractant for the extraction of scandium. The process is carried out with a metal chloride solution of 0.1 mol / l. pH after extraction 4,0-4,25, the distribution ratio of scandium (D Sc) is 0.8-1.0.
Since the conditions of the extraction of the prototype are different from those in which the works proposed extractant was made special experiment. Extraction was conducted 0.1 mol / L solution of n-tretbutilfenolformaldegidnogo resol oligomer ive chloride in toluene solution with a metal concentration of 0.01 mol / l. The volume ratio of organic to aqueous phase of 1: 1. The equilibrium value of 4.10 pH solution. The distribution coefficient of scandium 2.80.
The disadvantage of this is extracting a low distribution ratio of scandium.
The purpose of the invention is to increase the value of the distribution ratio of scandium and expanding the range of extractant used to extract it.
This object is achieved in that the extractant is proposed to use the nitrogen-containing n-alkyl (C 8 -C 9) phenol-formaldehyde oligomer (FSA) 0.05-0.20 mol / l, aromatic diluents and saturated hydrocarbons.
Prepared extractant solution in contact with scandium chloride having a metal concentration of 0.01 mol / l. The equilibrium pH value of 4.10-4.30.
Using the proposed increases the importance of extracting scandium distribution coefficient 2.80 to 81,2-260 compared with the prior art [1]
Technical product used nitrogen-containing n-alkyl (C 8 -C 9) phenol-formaldehyde oligomer molecule which is 10,11 monomer units having a nitrogen content of 4.5 wt. and an average molecular weight of 2500. AFFO formula shown below. Said agent belongs to a class of phenol-containing oligomers
When using AFFO extractant concentration less than 0.05 mol / l of scandium extraction efficiency is greatly reduced. AFFO extractant at a concentration above 0.20 mol / l is not possible to use because of its large viscosity.
Example 1. A solution of the nitrogen-containing n-alkyl (C 8 -C 9) a phenol-formaldehyde oligomer in toluene with a concentration of 0.1 mol / L in contact for 30 minutes with a chloride solution containing 0.01 mole / l of scandium. The volume ratio of organic to aqueous phase of 1: 1. The equilibrium pH value of 4.10. After phase separation, the value of D Sc is 168.
Example 2. The extraction process is carried out as in Example 1, but in the extractant AFFO content equal to 0.05 mol / l. After phase separation, the value of D Sc is 81.2.
Example 3. The extraction process is carried out as in Example 1, but the content in the extractant AFFO equal to 0.20 mol / l. After phase separation, the value of D Sc is 260.
Example 4. The extraction process is carried out as in Example 1 but using as diluent polialkilbenzol. After phase separation, the value of D Sc is 164.
Example 5. The extraction process is carried out as in Example 1, but as the diluent are n-octane. After phase separation, the value of D Sc is 173.
Example 6. The extraction process is carried out as in Example 1 but using kerosene as diluent. After phase separation, the value of D Sc is 175.
The proposed extractant can improve the extraction efficiency of scandium by increasing its distribution coefficient in comparison with the prototype with 2.80 to 81,2-260.
CLAIM
Extractant for extraction of scandium chloride solutions comprising nitrogen-containing phenol-formaldehyde oligomer, and an organic diluent, characterized in that the phenol-formaldehyde oligomer as it contains nitrogen-containing n-alkyl (C 8 -C 9) phenol-formaldehyde oligomer, a diluent and aromatic and saturated hydrocarbons with the following ratio, mol / l:
n-alkyl (C 8 -C 9) phenol-formaldehyde oligomer 0.05-0.20
Diluent to 1 liter
print version
Publication date 15.03.2007gg
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