The method of separation of scandium from titanium

 

(57) Abstract:

The invention relates to hydrometallurgy rare metals and can be used in the technology of extraction of scandium from waste products of titanium and zirconium, when cleaning scandium concentrates from titanium. A special feature of this method is that before extraction in the solution is injected hydrogen peroxide in a weight ratio with the concentration of titanium of 0.4 - 11, extraction was carried out with a solution aminobenzaldehyde oligomer in toluene and the extraction process is carried out at a pH of 1.8 to 4.1. The proposed method can improve the separation factor of the metals to 450, to reduce the concentration of sulfuric acid in the extraction system to 0.0001 - 0.01 mol/l (pH of 1.8 to 4.1), thereby decreasing the use of environmentally hazardous reagents, apparatus and to simplify the process and improve working conditions.

The invention relates to hydrometallurgy rare metals and can be used in the technology of extraction of scandium from waste products of titanium and zirconium, when cleaning scandium concentrates from titanium.

The known method of separation of scandium from titanium, including extraction from weakly acidic aqueous solutions of diethyl ether is literature, 1958, S. 26-67].

The disadvantage of this method is the complexity of the process associated with the need to develop solutions to 7 mol/l ammonium thiocyanate (in the absence of ammonium thiocyanate, the degree of extraction of scandium < 3%), and high fire hazard (flash point diethyl ether -40oC).

Closest to the present invention is a method of separation of scandium from titanium extraction with tributyl phosphate (TBP) from solutions containing 6-10 mol/l H2SO4[USSR author's certificate N 231831, MKI C 22 B 59/00, 28.11.1968 G., B. I. N 36].

The disadvantage of this method is the necessity of introducing a large amount of acid in the extraction system, resulting hardware complexity of the process, the deterioration of working conditions and environmental hazards of production; not high enough coefficient of separation of metals = 30.

The aim of the invention is to achieve a large partition coefficients of metals and reduction of sulfuric acid in the extraction system.

Feature of the proposed method of separation of scandium from titanium is that before extraction in the solution is injected hydrogen peroxide in a weight ratio with the concentration of titanium is avodat at a pH of 1.8 to 4.1.

The introduction of hydrogen peroxide in the extraction system allows you to achieve more than 90% recovery of titanium and to suppress this unwanted transition in the organic phase of scandium.

In sulfuric acid solution containing titanium and scandium, add hydrogen peroxide (CH2O2/CTi= 0,4-11), the solution is neutralized, after which the extraction is carried out with 0.5 mol/l solution of oligomer brand NRS in toluene for 2 hours, the final pH of 1.8 to 4.1.

At pH values less than 1,8, deteriorating the extraction of titanium and decreases the coefficient of separation of metals.

When the pH of the big 4,1, scandium precipitates and the process of separating metals disturbed.

When the ratio of CH2O2/CTi< 0.4, in the sediment falls titanium and the process of separation of metals is also impaired.

The increase in the concentration of hydrogen peroxide is irrational, because it does not improve separation of scandium from titanium.

Examples illustrating the invention.

Example 1. In sulfuric acid solution containing 0.50 g/l of titanium and 1.13 g/l, scandium add hydrogen peroxide to a concentration of 5,65 g/l, the solution is neutralized, after which the extraction is carried out with 0.5 mol/l solution of aminophe the treatment of titanium ETi=23,2%, the separation factor = 10.

Example 2. In the original solution, as in example 1, introducing hydrogen peroxide to a concentration of 5,65 g/l, the solution is neutralized and the extraction is carried out as in example 1, the pH of 1.80, ETi= 50%, = 39,8.

Example 3. In the original solution is injected hydrogen peroxide to CH2O2= 5,65 g/l, the solution is neutralized and the extraction is carried out as described above, the pH of 3.10, ETi= 94,0%, = 458.

Example 4. In the original solution is injected hydrogen peroxide to CH2O2= 5,65 g/l, the solution is neutralized and the extraction is carried out in the same way as above, pH of 4.10, ETi= 98,7%, = 115.

Example 5. In the original solution is injected hydrogen peroxide to CH2O2= 0.2 g/l, the solution is neutralized and the extraction is carried out as described above, the pH of 3,30, ETi=43 %, =34.

Thus, comparing the known method and offered by us can be seen that using the proposed method improves the coefficient of separation of metals from 30 to 450, to reduce the concentration of sulfuric acid in the extraction system with 6-10 mol/l to 0.0001-0.01 mol/l (pH 1.8 to 4.1) and to reduce, therefore, the use of environmentally hazardous reagents, apparatus and to simplify the process and improve working conditions.

< before extraction in the solution is injected hydrogen peroxide in a weight ratio with the concentration of titanium of 0.4 - 11, the lead extraction solution aminobenzaldehyde oligomer in toluene and the extraction process is carried out at a pH of 1.8 to 4.1.

 

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