DE2536846C3 - Gallium extraction process from gallium-containing alkali solutions of rare diffused metals - Google Patents

Description

The invention relates to methods of extracting rare metals from solutions and relates to a Gallium extraction process from alkaline solutions containing gallium. The process is suitable for the extraction of gallium from alkali solutions, which contain carbonates, phosphates, Chlorides, fluorides, aluminates, vanadates, chromates, molybdates, silicates, ferrates, zincates more alkaline Contain metals. & °

Solutions of the composition mentioned with a relatively high gallium content are used in the Bauxite and Ncphelinvcrarbeitunp

As such solutions are used in bauxite processing circulating alkaline aluminum solutions of the '"> Alumina production bcnut / 1, and bo> der Nepheünverar processing - accordingly - / nKuuerende soda potash mother liquors Use the potiaschi manufacture

At present, gallium is used as a component of the A "B ^v -semiconductor compounds, the tooth filling alloys, liquid current collectors in electrical machines, the working medium of radiation circles as well as in high temperature thermometers.

A method of extraction from gallium is known Alkali solutions that are achieved either electrolytically or in the contact process by electrochemical reduction will.

During electrolysis, nan cathodes are used solid metals as well as iron, nickel and steel alloys, which are resistant to alkali solutions, also from liquid metals - such as mercury, gallium and alloys of mercury with sodium (sodium amalgams).

Nickel is predominantly used as the anode. In the case of contact reduction, there will be: s Gallium in the Alkali solution down to the metal state as a result of a contact redoxide reaction between the gallium ions in the solution and a metal with a higher oxidation potential than the gallium.

The oxidizing metal goes into the solution while the reduced metal is extracted from the solution.

The above-mentioned electrolytic and contact reduction processes are used in gallium extraction from alkali solutions and also from solutions in the extraction of aluminum trihydroxide (the water-containing clay) according to the Bayer process and other processing methods of Aluminum ores.

The mixtures contained in the solution, e.g. B. Chromium, Vanadium, Eissin, set the degree of extraction of gallium substantially down; therefore it is advisable to use the To free solutions from these admixtures.

The main deficiency of the operational processes of gallium production, which are based on the electrochemical Ga '.'. Ium reduction with mercury and its amalgams is based on the toxicity of mercury.

The well-known cleaning process of the solutions from the impurities, which the gallium extraction hinder, either by cooling with subsequent crystallization, or by reduction or by Exposure to calcium hydroxide allow only limited technological improvements Characteristic values of the electrochemical gallium reduction.

The separate use of each of the cleaning methods mentioned can de elimination of the Additions to the required extent do not guarantee the electrochemical gallium reduction hinder.

A process of gallium extraction is known Gallium-containing alkali solutions, in the electrochemical gallium reduction, turns into liquid mercury There is superalloy containing 0.6-0.8% (in percent by mass) sodium, with mixing of the Melt with the help of a propeller niche that deals with rotates at a speed of 15 rpm (see GDR patent specification No. 27185).

This process is flawed by the use of mercury.

A deficiency in the electrochemical gallium! education With the help of naüiumhaltiger mercury alloys consists in the low solubility of the gallium in the Mercury and the subsequent heavy separation of gallium from mercury, resulting in a high riffectivity of gallium extraction cannot be achieved.

The aforesaid method can result in effective movement of the liquid alloy and the solution the creation of a plane-parallel movement in the layer of the liquid alloy and the solution does not ensure which a material exchange between them worsens also offers the said Procedure no possibility of carrying out the work process with a controllable intensity.

The invention is based on the object by appropriate choice of new operating conditions electrochemical reduction to develop a gallium extraction process, which is the recovery of a Metal of higher purity allows and the implementation of an ongoing work process of adjustable intensity guaranteed

This object is achieved in that in the present method of gallium extraction Gallium-containing alkali solutions, consisting in the electrochemical Gas reduction through metal-liquid substances, according to the invention the electrochemical gallium reduction is carried out in an electromagnetic alternating current field.

The liquid metal substance used in the electrochemical gallium reduction is expediently liquid Gallium, gallium alloys with an aluminum content of 0.05-0.5 percent by mass and gallium alloys with an aluminum and zinc content of 0.05-0.5 and 0.1-10 percent by weight, respectively.

The use of an electromagnetic field creates favorable conditions for effective transport of the liquid metal substance and for an effective remedy of the disturbing effect of the protective skins, which on the surface of the metal liquid substance of the cathode during the electrochemical gallium extraction arise from the alkali solutions.

The use of a wax electromagnetic field enables a transport of the liquid metal substance relative to the alkali solution in a given Direction and with controllable intensity at a transition from laminar to turbulent movement and ensures favorable conditions for an even distribution of the aluminum and zinc components in the liquid metal material, if the corresponding gallium-based alloys are used for this be used.

The introduction of aluminum into the alloy in the concentration mentioned ensures a potential difference, which is required for the electrochemical gallium contact reduction, the zinc being the Reduces the solubility of the admixtures in the gallium.

It is also expedient to carry out the electrochemical gallium reduction in an electromagnetic alternating current field with cathode polarization of the liquid metal substance with direct current at a current density of 0.001-0.1 A / cm ² .

With the cathode polarization of the liquid melt, the gallium yield can lead to electricity consumption 40 - 45% is achieved with an aluminum consumption of 2 g per t g of the extracted gallium.

A higher efficiency of gallium extraction from gallium-containing alkali solutions of alumina production, which contain admixtures that hinder the gallium extraction, can be done by reducing the mentioned admixtures and their subsequent removal from the solution still \ <> r the electrochemical <\ "> see gallium extraction achieve.

It is advisable to add these admixtures through appropriate treatment of the solutions mentioned to reduce with a deoxidizer, the oxidation potential of which corresponds to the reduction potential of the relevant Admixture, after which the reduced admixtures either by filtering, Settling or by treating the solution with a reducing agent, which is an alkaline earth element contains can remove.

The invention enables the efficiency of gallium extraction from gallium-containing alkali solutions to be increased thanks to the implementation of the electrochemical reduction in an electromagnetic alternating current field with the use of new alloy compositions on the basis of gallium and the development of such working conditions which offer the possibility of removing up to 90% gallium from the solution within 1 - 2 hours to be withdrawn, whereby a high current yield of the gallium (up to 40-45%) with an aluminum consumption of 2-17 g per 1 g of gallium is guaranteed. The present process enables metal extraction with an admixture content e.g. B. of copper in a range of 1 - 2.10 - "- 10- ³ mass ¹ M).

According to the invention, the method in question can be implemented as follows. the Gallium-containing alkali solution is mixed with a liquid metal substance, e.g. B. a Galiium alloy with a Aluminum content of 0.05-0.5 percent by weight brought into contact. Contact of the alloy with the solution takes place in an electromagnetic alternating current field with an intensity of 1500— 500,000AZm. Gallium-aluminum alloys with an admixture of zinc can be used as liquid metal substances use.

The stated aluminum concentration ensures a potential difference that reduces the in of the alkali solution containing gallium is required, the upper concentration limit of the Approximation to the degree of saturation with aluminum at the state temperature depends.

The reduction process is carried out at a temperature which is the solidification point of the metal-liquid Substance exceeds, but which is below the boiling point of the solution.

When the solution comes into contact with the alloy mentioned, a redox reaction takes place, which causes the Aluminum passes into the solution, and the reduced gallium is withdrawn from the solution. To one to ensure uninterrupted process of gallium extraction from the solution, and the most favorable To achieve characteristic values, certain amounts of aluminum are continuously introduced into the solution.

When the extraction is complete, the solution is separated from the liquid alloy, after which the latter is used Extraction of metallic gallium is processed.

In a continuous process, the solution moves through its contact zone at a certain rate let through with said melt.

Another implementation variant of the invention The method is that the melt with the help of a conductor with the negative pole of a Current source is connected, while the anode is arranged in the solution, which with the positive Pole of said power source is connected.

The solution and the melt brought into mutual contact lead to direct current, whereby the current density in the melt is in the range from 0.001-0.! A / cm ² - and the melt is cathodically polarized.

In this case, the reduction process proceeds at a higher speed and an increased one Security, because even if the in The aluminum contained in the melt involves the extraction of gallium from the solution by the from the external source electric current continues to flow.

In gallium extraction from solutions in alumina production the additions that hinder the gallium reduction, such as vanadium, chromium, Chlorine, sulfur, organic substances, silicon and fisen, removed

The alkali solution is ^{heated up to 50-100 0} C and treated with a reducing agent, ζ. Β. Treated aluminum or gallium alloys containing aluminum or aluminum and zinc. B. Use hydrazine and its salts, iron (II) sulfate and sodium sulfite. This treatment lasts until such impurities as vanadium and chromium are reduced, which are then removed. Then, if necessary, the solution is treated with a reducing agent, which is an alkaline earth compound, e.g. B. calcium oxide, calcium hydroxide or magnesium hydroxide and / or calcium-containing waste from alumina production. After this operation, the solution is separated from the sediment and processed according to the process variants listed above

In the event that the gallium-containing alkali solution only Admixtures such as vanadium and chromium in quantities that an electrochemical gallium reduction hinder, the process according to the invention can be carried out as follows.

The gallium-containing alkali solution, which also contains vanadium and chromium, is first treated with a Deoxidizer treated until the vanadium and chromium additions are reduced, and there the reduced forms of these admixtures are not very soluble in the alkali solution, the admixtures become removed either by filtering or settling, after which the solution is subjected to electrochemical reduction is forwarded.

In alkaline solutions containing gallium with a concentration of sodium oxide The solubility of the compounds of reduced chromium increases above 150 g / l, so that it cannot be removed by reducing it to the extent required. That's why they get better Results in removing the admixtures of chromium and also other elements, e.g. B. iron, by Reduction of these admixtures with their subsequent elimination achieved if you do it with a Treated reactant, which contains an alkaline earth compound.

Gallium-containing alkali solutions with a sodium oxide concentration of more than 150 g / l contain prectic always admixtures, such as copper, iron, titanium, nickel, molybdenum, which with continuous use of gallium as the basis of the metal liquid substance for the electrochemical reduction itself in this substance accumulate and thus deteriorate the quality of the extracted metal.

The method according to the invention can therefore be used as follows in the case of gallium extraction from such solutions be performed.

The gallium-containing alkaline starting solution is made with either aluminum, or aluminum and Zinc-containing gallium alloy brought into contact c.

After a certain period of contact, during which the electrochemical reduction of a significant Amount of admixtures and a small amount of gallium (pre-reduction), the solution is with a brought into contact with a new portion of said alloy.

According to the invention, metallic gallium can also be used as a liquid metal substance. In this case, the extraction process is carried out according to one of the variants mentioned, the gallium being polarized ^{with direct current with a density of 0.001-0.1 A / cm 2.}

The polarization of the melt with direct current with a density of 0.001-0.1 A / cm ² serves as a means of increasing the effectiveness of the extraction process.

To explain the essence of the invention in detail, concrete exemplary embodiments of the method are given below.

example 1

From a solution containing 180 g / l sodium hydroxide and 0.25 g / l gallium, the latter was obtained by electrochemical reduction using a 0.5% Gallium alloy containing aluminum extracted.

The contact of the solution with the metal-liquid Melting took place at a temperature of 45 "C in an electromagnetic alternating current field with an intensity of 60,000 A / m.

After 20 minutes, the degree of extraction of the gallium from the solution mentioned reached 95%.

Example 2

From a solution containing 180 g / l sodium hydroxide, 45 g / l sodium carbonate, 135 g / l aluminum oxide, 0.17 g / l gallium, the latter was obtained by electrochemical Reduction using a gallium alloy containing 0.15% (in percent by mass) aluminum and 5

^ ₀ mass percent zinc, entogenic. The aluminum content of the melt was maintained at the level mentioned in the course of the process by introducing metallic aluminum into the melt in an amount corresponding to the amount of aluminum which passed into the solution as a result of the electrochemical gallium reduction. The process took place in an electromagnetic alternating current field with an intensity of 60,000 A / m.

After 1.75 hours, the degree of extraction of gallium from this solution reached 90% and between 17 g Aluminum consumption per 1 g of the withdrawn gallium.

Example 3

The gallium was removed from an alkali solution of the same composition as in Example 2 by electrochemical reduction with the aid of a gallium alloy containing 0.05 percent by mass of aluminum and 5 percent by mass of zinc. The melt was cathodically polarized at a current density of 0.001 A / cm ^2. The process took place in an electromagnetic field with an intensity of 45,000 A / m. The aluminum and zinc concentration in the melt was maintained as in Example 2.

! ”Laughing for 60 minutes, the degree of extraction of the gallium reached 90%, the current yield was 45%, the Aluminum consumption was 8 g per 1 g of the withdrawn gallium.

25 56

Example 4

The composition of the solution and the test conditions were the same as in Example 3, the only difference being that the melt was polarized ^{at a current density of 0.01 A / m 2.}

After 55 minutes the degree of extraction of the gallium reached 90%; the current efficiency was equal to 42%, the Aluminum consumption was 7.5 g per 1 g of the withdrawn gallium.

Example 5

The composition of the solution and the experimental conditions were the same as those of Example 3, the only difference being that the melt was cathodically polarized ^{at a current density of 0.05 A / cm 2.}

After 25 minutes the degree of extraction of the gallium reached 90%; the current efficiency was equal to 11.1%, the Aluminum consumption was 4.2 g per 1 g of the withdrawn gallium.

Example 6

The composition of the solution and the test conditions were the same as those of Example 3, the only difference being that the melt was cathodically polarized ^{at a current density of 0.1 A / cm 2.}

After 15 minutes the degree of extraction of the gallium reached 90%; the current efficiency was equal to 9.6%; the Aluminum consumption was 3.2 g per 1 g of the withdrawn gallium.

Example 7

35

A solution containing in g / l: sodium carbonate - 240, sodium hydroxide - 19, aluminum oxide - 10, Chromium - 0.8, vanadium - 0.08, gallium - 0.15 before electrochemical reduction with metallic aluminum powder for chromium and vanadium reduction Treated to the lower valence, after which the solution with an aqueous calcium oxide solution processed at a temperature of 90 - 200 ° C.

After the sediment was separated off, the solution had the following composition in g / l: Sodium carbonate 124, Sodium Hydroxide - 111, Aluminum Oxide - 8, Chromium - 0.001, vanadium - 0.003 and gallium - 0.14.

The gallium was extracted from this solution by electrochemical reduction with the aid of a gallium alloy with an aluminum content of 0.25 percent by mass. The process took place in an electromagnetic alternating current field with an intensity of 60,000 A / m. The solution was additionally moved relative to the melt by being passed through the apparatus for the electrochemical reduction of gallium.

After 60 minutes the degree of extraction of gallium from the solution reached 92%; the aluminum consumption is 16 g per 1 g of the withdrawn gallium.

Example 8

60

A circulating solution of alumina production, containing in g / l: sodium carbonate - 145, sodium hydroxide

- 240, aluminum oxide - 65, vanadium - 0.17, chromium

- 0.06, gallium - 0.22, was treated with a reducing agent and between sodium sulfite (2 g per 11 of the solution) and calcium hydroxide milk of lime at a temperature of 90-10O ⁰ C in the course of 2 hours.

After the sediment was separated off, the solution had the following composition in g / l: Sodium carbonate 60, Sodium hydroxide - 204, aluminum oxide - 31, vanadium - below 0.003, chromium - below 0.003, gallium 0.17.

Zinc oxide was introduced into the above solution in an amount equal to the gallium content in the Solution was the same and which one at dfr reduction with With the help of an aluminum-containing gallium alloy Zinc concentration of 8 percent by mass in the melt guaranteed.

The gallium was made from this solution under test conditions withdrawn, which were given in Example 7.

After 45 minutes the degree of extraction of the gallium reached 87% with an aluminum consumption of about 4 g 1 g each of the withdrawn gallium.

Example 9

From a circulating solution of alumina production, containing in g / l: chromium - 0.01, vanadium - 0.03 and Gallium - 0.17, the gallium was made more rich in aluminum and zinc by electrochemical reduction Gallium alloys withdrawn. First, the solution with an alloy, which 0.2 mass% aluminum and Containing 5% by mass of zinc and then with a gallium alloy containing 0.05% by mass of aluminum, brought into contact. Previously in the solution was zinc in the form of sodium zincate in an amount introduced to obtain a zinc concentration of 0.15 g / l in the solution.

The process took place in an electromagnetic alternating current field with an intensity of 60,000 A / m and at a frequency of 50 Hz.

After 60 minutes, the degree of extraction of the gallium from the solution reached 87% with an aluminum consumption of 20 g per 1 g of the withdrawn gallium. The content of the copper admixture in the optionally obtained raw metal was 1 - 10.3 ~ ⁴ mass percent.

Example 10

From an alkali solution containing in g / l: sodium hydroxide (caustic soda) 200, chromium - 0.6 and gallium 0.5, the gallium was removed from the chromium solution after prior purification by reduction with hydrazine sulfate in an amount of 5 g per 1 g of solution unc subsequent treatment with calcium hydroxide ir an amount equivalent to the introduction of 25 g of reagent into one liter of the solution, converted to] active calcium, guaranteed.

The solution was treated with the reagents mentioned at a temperature of 100 ° C. over the course of three hours.

After the sediment had been separated off, the chromium concentration decreased to 0.005 g / l. From the thus purified solutions was the gallium Government durci electrochemical reduction using a Galliumle containing 0.1% aluminum under the Einwir effect of an electromagnetic field with a: intensity of 60 000 A / m voi 6O ⁰ C withdrawn at a temperature .

After 45 minutes the degree of extraction of the gallium from the solution reached 90%; the aluminum consumption was 17 g per 1 g of the entogenic gallium.

Example 11

From an alkali solution, which contained in g / l Potassium carbonate - 403, caustic potash - 86, aluminum oxide

- 28.6, gallium - 0.32, chromium - 0.02 and iron 0.007, the gallium was after previous purification of the solutions by treating them - initially by Reduction with hydrazine sulfate in the presence of an iron catalyst and then withdrawn with calcium oxide.

The consumption of hydrazine sulfate was 200% compared to the stoichiometric for the reduction of Chromium and iron, the consumption of calcium oxide was derived from the calculation ratio of calcium oxide to aluminum oxide assumed to be 1: 1. The mentioned treatment lasted 3 hours for one Temperature from 80 - 100 ° C.

After the sediment separation, the solution had the following composition, in g / l: Potassium carbonate - 260, caustic potash - 129, aluminum oxide - 11.8, gallium under 0.28, chromium - below 0.003, and iron - below 0.005.

When gallium is extracted from this solution by electrochemical reduction in an electromagnetic Containing an alternating current field with an intensity of 150,000 A / m with the aid of a gallium alloy 0.1% aluminum and 0.5% by mass zinc reached the degree of extraction of the after 1.5 hours Gallium 80% with an aluminum consumption of 18 g per 1 g of the withdrawn gallium.

Example 12

From an alkali solution containing in g / l: calcium carbonate - 480, caustic potash - 49, aluminum oxide - 31.7, Chlorine - 7.1, gallium - 0.29, chromium - 0.03, vanadium

- 0.015, iron - 0.006, sulfur - 3.48, after prior purification of the solutions of the gallium the admixtures by treatment with a reducing agent - divalent iron sulfate and a calcium-containing reaction agent - "white" Silicification sludge, contained in percent by mass -%; Calcium - 30.5, aluminum oxide - 20.3, Sodium oxide - 9.98, silicon dioxide - 9.6, magnesium oxide - 0.8, iron oxide - 0.6, entogenic.

The iron sulphate consumption was 200% compared to the stoichiometric for the solution components to be reduced: the sludge consumption was assumed on the basis of a ratio of the oxide of the alkaline earth elements of calcium and magnesium to the aluminum oxide in the solution of 2: 1. The entire treatment with the reagents mentioned lasted 2.5 hours at a temperature of 80 ^° C. After the sediments had been separated off, the solution had the following composition in g / l: potassium carbonate - 378, caustic potash - 67, aluminum oxide - 36, chlorine

- below 0.01, gallium - 0.27, chromium - below 0.003, vanadium - below 0.003, iron - 0.0015, sulfur 3.00.

The gallium was removed from the solution mentioned by the method described in the previous example.

After 1.5 hours the degree of extraction reached des Gallium from the solution 75%, with 17 g of aluminum per 1 g of the withdrawn gallium being consumed.

Similar results were obtained with the purification of the alkaline starting solution from the admixtures and with the gallium extract when the solution was treated with iron sulfate as a reducing agent and with desiccation sludge as a reaction agent, which contained an oxide of an alkaline earth element ): Calcium oxide - 57.4, silicon dioxide - 31.1, aluminum oxide - 2.6, iron oxide - IX sodium oxide - 1.6, magnesium oxide - 1.4. The consumption of said reactants and the treatment conditions were the same as in the previous experiment.

Example 13 An alkali solution, contained in g'l: Sodium carbonate

- 277, caustic soda - 170, aluminum oxide - 85.3, Vanadium - 0.02, chromium - 0.06, gallium - 0.6, was removed from the admixtures by treating the solution

ίο cleaned with sodium sulfite and calcium oil; yd. Of the Sodium sulfite consumption per 1 l of the solution was equal to 1 g; the calcium oxide consumption was per 1 liter of the solution 45 g. The treatment of the solution with the reagents mentioned lasted 3 hours at 100 ° and 80 ° C

i.S accordingly with a reducing agent and with Calcium oxide.

After the bottom had been removed, the solution had the following composition in g / l: sodium carbonate

- 169, caustic soda - 242, aluminum oxide - 78.8, vanadium - 0.002, chromium - below 0.003, gallium 0.58.

From this solution the gallium was made by electrochemical reduction with the help of a gallium alloy, containing 0.2% aluminum and 5% zinc in an electromagnetic alternating current field with a Intensity of 60,000 A / m extracted. The aluminum and zinc concentration was on the above Maintain level by immediately dissolving these metals in the melt.

After one hour the degree of extraction of the gallium reaches 87% with an aluminum consumption of 14 g 1 g each of the withdrawn gallium.

Example 14

From a solution containing in g / l: sodium hydroxide - 180 and gallium - 0.25, the latter was withdrawn by electrochemical reduction with the aid of liquid gallium during its cathode polarization with direct current with a density of 0.05 A / cm ^2. The solution was in contact with the melt at a temperature of 50-55 ° C. in an electromagnetic alternating current field with an intensity of 180,000 A / m. After 20 minutes, the gallium extraction rate reached 93%.

Example! 5

From a solution containing, in g / l sodium hydroxide, sodium hydroxide - 180 and gallium - 75, there became; the latter by means of electrochemical reduction

so from liquid gallium at its cathode polarizer with direct current with a density of 0.074 A / cm ^: withdrawn. The contact of the solution with the melt took place at a temperature of 50-55 ° C in an electromagnetic field with an intensity before

SS 500,000 A / m. After 3 hours, the degree of extraction of the gallium reached 973%. The current yield was 91%.

Example 16 From a solution containing in g / l: sodium carbona

- 246, sodium hydroxide - 69, aluminum oxide - IC Chromium - OA Vanadium - 0.08, Gallium - 0.15, was ( the latter by electrochemical reduction with the help of a gallium alloy, containing 03 mass pro cent aluminum, withdrawn. The contact of the solution mi the melt took place in an electromagnetic! AC field with an intensity of 60,000 A / m. The vanadium and chromium additions were mi

Π 12

Can withdraw the help of the same melt in the electromagnetic field.

previously reduced; Then the reduced forms The degree of extraction of the gallium from the on these

removed from the solution. Way purified solution reached after 60 minutes

There were two methods of trash removal - 92%. The consumption of the reducing agent - the in

gung - the filtering of the solution and the settling of 5 ae> - the melt contained aluminum was 24 g im

tried. The corresponding results showed that the ratio to 1 g of the withdrawn gallium,

one with a reduction time of 30-40 minutes and die from the solution according to the cited

a subsequent filtering or settling of the vanadium and chromium compounds removed from the example

Solution practically 100% of the additions mentioned can be used for further processing.

Claims (9)

Patent claims: 1. Gallium extraction process from gallium-containing alkali solutions, consisting in the electrochemical process Gallium reduction with the aid of liquid metal substances, characterized in that the electrochemical reduction is carried out in an electromagnetic alternating current field. 2. The method according to claim I _1, characterized in that the process is carried out with liquid gallium. 3. The method according to claim 1, characterized in that the electrochemical reduction with The help of gallium alloys is carried out,> 5 which aluminum in an amount of 0.05 - 0.5 % By mass included. 4. The method according to claim 1, characterized in that the electrochemical reduction with The help of gallium alloys is carried out, which aluminum and zinc accordingly in one Contains amounts of 0.05-0.5 and 0.1-10 percent by weight. 5. The method according to claim 1-4, characterized in that the electrochemical reduction is carried out with cathode polarization of the liquid metal substance with direct current with a density of 0.001-0.1 A / cm ² . 6. The method according to claim 1, characterized in that in the gallium extraction from Gallium-containing alkaline solutions which contain additives that hinder the gallium extraction, the said admixtures reduced before the electrochemical gallium extraction and from the Solution to be removed. 7. The method according to claim 6, characterized in that that a reducing agent is used whose reduction potential exceeds the reduction potential of the admixtures. 8. The method according to claim 6, characterized in that the reduced admixtures from the Solution can be removed by filtering or settling. 9. The method according to claim 6, characterized in that the reduced admixtures through Treatment of the solution with a reactant which contains an alkaline earth compound removed from this solution.