Methods of extraction of precious metals from the tantalum-niobium ores containing insoluble fluorides

 

(57) Abstract:

The proposed methods are to hydrometallurgy. They include the leaching of mineral acid, the metal-containing material, such as ore slurry, which consists of fluoride metal compounds, in the presence of a complexing agent containing aluminum, silicon, titanium or mixtures thereof and causing the complexation of fluoride ions. The proposed methods allow to allocate precious metals, fluoride, and radionuclides from the loaded material with a high content of minerals, in which metals and radionuclides present in the form of a practically water-insoluble fluorides or captured in a matrix of a metallic fluoride, practically insoluble in typical systems of chemical reagents. 6 C. and 7 C.p. f-crystals, 6 tab., 3 Il.

The invention relates to a process for recovering valuable metals from metal-containing materials, such as ore, ore sludge and slag. The method is especially suitable for the dissolution of fluoride compounds of metals from the ore slurry containing tantalum and niobium.

The production of many commercially valuable metals or metal compounds from mineral ores involves warkoczeski components, contained in the ore, metal components, soluble in aqueous systems, in order to separate the valuable metal components by selective extraction or etc.

Ore concentrates containing tantalum and niobium, usually decompose hydrofluoric acid (HF) or mixtures of hydrofluoric and sulfuric acid (HF/H2SO4). After that, the formed heptapteridae compounds of tantalum and niobium is separated and purified by solvent extraction.

In particular, in the conventional process of production of tantalum pentoxide (TA2ABOUT5) fraction of tantalum after decomposition of the ore is removed with the aqueous phase, from which patikis tantalum precipitated with ammonia and extracted with filtration method. Similarly, you can get patikis niobium.

Industrial schema extraction and extraction of tantalum and niobium-rich ores or slags tin production is described in detail in U.S. patents 2767047, 2953453, 2962372, 3117833, 3300297, 3658511, 3712939 and 4164417. General description other ore technologies can be found in the "Extractive metallurgy of niobium, tantalum and vanadium" in Proc. of the International metallurgy International Metals Review, 1984, T. 29, 26, S. 405-444, published by the Society of Metallurgy (London and, in particular, in the processes of production of tantalum and niobium, after autoclaving is formed ore slurry containing a number of different valuable metal components, including tantalum and niobium. In U.S. patent 5384105 disclosed a method of extracting residual tantalum/niobium from ore materials with a high content of fluoride compounds by contacting these materials with a mixture of mineral acids containing boric acid (H3IN3).

In the publication WO 95/13985 discovered a way to extract the valuable metal components by dissolution of the metal-containing material, having in its composition fluoride compounds, comprising contacting the source material with mineral acid and a complexing agent capable of forming a complex with fluoride with the dissolution of the metal constituents present in the ore source material, followed by separation of the resulting solids and solution. According to a known technical solution to extract uranium and thorium, and as a complexing agent is used, the boron compound (H3IN3to get from the source material fluoride complexes in the form of fluorides of boron, the UNT, serving for the conversion of boron fluoride in the fluoride of aluminum. However, WO 95/13985 does not offer or imply that aluminum, silicon or titanium can be used in the absence of boron for formation of complex complexing agent/fluoride".

From the book. Has J. Dolezal and other Methods of decomposition of rocks and minerals" (M. : Mir, 1968, S. 53, bottom paragraph) also known a method of extracting tin from tin-containing source material, including contacting it with a mineral acid by dissolving part of the components of the soluble components with subsequent separation of the resulting tin-containing material and solution. This method, however, it would be difficult to use for some types of source of tin-containing materials, especially those that contain radioactive components.

The invention provides a method of recovering valuable metal components by dissolution of the metal-containing material, having in its composition fluoride metal compounds, comprising contacting the metal-containing material with mineral acid and a complexing agent containing aluminum, silicon, titanium or mixtures thereof, heating at a temperature and pressure as part of at least one metal component, present in the metal-containing material, and separating the resulting solids and the solution obtained after dissolution.

The invention also provides metal-containing product obtained in this way from a source material containing tantalum, niobium and radioactive components containing tantalum in a concentration, by weight, exceeding at least twice the concentration in the source material, niobium concentration, by weight, exceeding at least twice the concentration in the source material, and not more than 33 wt.% radioactive constituents present in the source material.

Another object of the invention relates to a method of reducing the concentration of radioactive metal components present in the metal-containing material containing radioactive metal components, comprising contacting the metal-containing material with mineral acid and a complexing agent containing aluminum, silicon, titanium or mixtures thereof, heating the metal-containing material at a temperature and pressure sufficient to form the complex of the complexing agent and fluoride and dissolving at least part of the e formed solids and solution, obtained after dissolution.

And another object of the invention relates to a method of extracting a metal tin from tin-containing source material, containing and fluoride compounds, comprising contacting the tin-containing starting material with a mineral acid and a complexing agent at a temperature and pressure sufficient for complex formation of insoluble fluorides and dissolving at least part polovynny metal components present in the source material, and separating the resulting tin-containing material and the solution obtained after dissolution.

Accordingly, the invention also relates to metal-containing product obtained in the above way from the source material, which includes a metal tin and radioactive components containing tin at a concentration, by weight, exceeding at least twice the concentration in the source material, and not more than 33 wt.% radioactive constituents present in the source material.

The proposed method allows to dissolve insoluble in other ways valuable metal components. Additional prey as tin, which do not dissolve.

The term "metal" in this context is used in its conventional meaning and refers to the element that forms positive ions when its compounds are in solution. Metal include alkali metals, alkaline earth metals, transition metals, noble metals, platinum group metals, rare metals, rare earth metals, actinide metals, light metals and heavy metals.

The advantage of the proposed method lies in the fact that it is soluble metal constituents of the ore slurry are separated from the insoluble metal components, and, in particular, allows selective separation of tantalum and niobium components.

Another advantage of the proposed method is that it allows to obtain a product of ore slurry with a high percentage of tantalum and/or niobium components and/or other insoluble metal components.

Another advantage of the proposed method is that it allows to obtain a product of ore slurry with a low content of soluble radioactive metal components.

Obrabotke to extract the valuable metal compounds.

The proposed method also allows further processing of the solution after dilution to separate and extract the soluble metal components.

The proposed method can be used for extraction of tantalum and/or niobium components of the metal-fluoride complexes.

The proposed method allows to separate the complexing agent and recover/recycling of the solution after dissolution.

Another advantage of the proposed method is that it can be used to increase the concentration of tin components present in the original metal-containing material, which includes tin.

Further, the invention is illustrated by examples of its implementation with reference to the accompanying drawings, on which:

Fig. 1 - flow chart of the possible variants of carrying out the invention

Fig.2 is a graph illustrating the effect of ion ratio Al/ion F on the extraction of tantalum and niobium in the following experiments, and

Fig. 3 is a graph illustrating the extraction of the radioactive components in the following experiments using hydrochloric acid as the mineral acid and aluminum as comply metal-containing material, preferably the ore slurry containing the metal components in the form of fluoride compounds in the presence of a complexing agent which forms complexes with fluoride ions. The proposed method provides for the separation of metal, fluoride and radionucleotide components from the feed material with a high content of minerals, in which metals and radionucleotide present in the form of a practically water-insoluble fluorides or captured in a matrix of a metallic fluoride, which is practically insoluble in many systems of reagents.

According to the invention the proposed method for the dissolution of the precious metal components of the metal-containing material, such as ore slurry containing metallic components in the form of fluorides, is that:

provide communication ore slurry with the mineral acid and a complexing agent at a temperature and pressure suitable for the formation of insoluble complexes of fluoride and for dissolving at least part of at least one metal component present in the ore slurry, and

share formed after the dissolution of the ore was going can be applied successfully to the extraction of metallic tin. According to the invention, the method of extraction of metallic tin from the tin-containing source material is that and provide contact tin-containing starting material with a mineral acid and a complexing agent at a temperature and pressure suitable for the formation of insoluble complexes of fluoride and dissolving at least part polovynny metal components present in the ore slurry,

and share the resulting tin-containing material and the solution obtained after dissolution.

Enrichment of tin-containing source material or a further increase in the concentration of tin in the tin-containing material obtained by using the proposed method, it is possible to carry out traditional methods of physical separation, for example by the method of separation by density on the river Deister table, spiral separator Humphrey, vibration and/or flotation. Enrichment of tin-containing source material before and/or after the execution of this method will increase the concentration of tin in the tin-containing material obtained in this process.

Below describes in detail the proposed method.

The source material for predlagaiu. Preferably the metal-containing material is an ore slurry containing metallic components in the form of fluorides, for example, the ore slurry conventional production process pentoxide tantalum/niobium pentoxide. In this context, the term "metallic components in the form of fluoride compounds" refers to a compound containing at least one metal ion and at least one fluoride ion. Metallic components in the form of fluoride compounds included in the ore slurries include, but not limited to, tantalum (TA), niobium (Nb), calcium (CA), aluminum (A1), iron (Fe), titanium (Ti), zirconium (Zr), chromium (CR), lead (Pb), uranium (U), thorium (Th), barium (BA), tin (Sn), magnesium (SB), scandium (Sc), yttrium (Y) and arsenic (As) present in the following compounds/complexes: ThF4, TaOF3, NbOF3CaF2UF4: F2ScF3THAT YF3, SiF2, SnO2, 1F3, FeF2, Tio2, ZrF4CrFIli, PbF2, MgF2AsFIli.

In the proposed method, the source material (ore slurry containing fluoride compound of the metal, which may also contain tantalum and/or niobium components) is brought into contact with an aqueous solution of mineral acid and UB>2SO4) and hydrochloric acid (model HC1). The choice of mineral acid depends on several factors, including the chemical composition of the original ore slimes type separation system used in the process and/or during subsequent processing leaching fluid, and the cost of extracting the desired metal components. For example, if you want to separate and remove from the leaching liquid uranium metal can be used as the mineral acid is sulfuric acid as it forms soluble uranium salt, in addition, sulfuric acid is relatively cheap and is compatible with many commonly used technologies of extraction. If you want to separate and remove from the leaching liquid metal radium, the sulfuric acid will be less suitable as radium-insoluble sulphate systems. So, if you want to retrieve from leaching liquid radium, preferably hydrochloric or nitric acid.

Suitable complexing agents may be those which have a high affinity for fluoride ion. They include, but not limited to, aluminum, silicon, titanium and mixtures thereof. The complexing agent can be added as part of the connection, such as, but not the use of titanium as a complexing agent, for example in the form of ilmenite or Tio2effectively in cases where the main source of solid-phase fluoride is Caf2. If the main source of solid-phase fluoride is 1F3it is preferable to use complexing agents containing aluminum.

It is preferable to use such an amount of complexing agent, wherein the molar ratio of the content of complexing agent molar content of the source material corresponds to the following formula:

< / BR>
Under the moles of complexing agent in this formula assumes a simple form complexing agent, i.e., aluminum, silicon, etc., If, for example, complexing agent is aluminum, the input in the form of aluminium hydroxide, the molar content of added complexing agent is determined by the following formula:

< / BR>
Moles of fluoride in the source material can be determined and/or approximated be obtained by analysis of the material and/or realization of mineral balance in a known manner.

The amount of acid depends on the form used complexing agent and, therefore, emyh acid, should be sufficient to react with the bound oxygen in the system after adding a complexing agent. For example, if the complexing agent is aluminum, the input in the form of alumina (Al2O3), the number of hydrogen ions introduced into the system by the acid should be sufficient to react essentially all the oxygen released by the decomposition of alumina. Typically used at 0.1-2.0 lbs (45 g - 907 g) of acid per pound (454 g) of dry starting material.

Acid, complexing agent and the source material is suspended in water and cooked at elevated temperatures when the solids content of 5-40 wt.%, preferably 5-30 wt.%, most preferably 10-20 weight. %. Preferably this mixture is stirred to support virtually all solids in suspension.

Solids cook until until you dissolve some of soluble compounds of precious metals, preferably until you dissolve most of the soluble compounds of precious metals present in the source material. The temperature of the mixture is preferably supported at the level of 40-110oWith, preferably 80-95o

Although the authors do not wish to be bound by any theory, they believe that the reactions occurring during autoclaving in the case when the complexing agent is introduced in the form of alumina (Al2O3), and soluble metal (Rest. M) is a compound of a precious metal, can be summarized as follows:

The overall reaction of dissolution

(Rest.M)xFy+Al2O3+6l<=>3H2O+(Rest. M)xCLz+2AlFy/2Cl(6-z)/2,

where N2Oh, (Rest. M)xCLzand AlFy/2CL(6-z)/2are in solution,

x, y, z are integers.

Component of the complexation of

(Rest.M)xFy+2ll3<=>(Rast.M)xCLz+2AlFyCL(6-z)/2,

where ll3formed in the course of the next reaction in the cooking solution:

Al2ABOUT3+6l<=>3H2O+2ll3.

For example, soluble elementary alkaline earth metal calcium (CA) we have the following reaction:

The overall reaction of dissolution for Sa:

Caf2+Al2ABOUT3+6l<=>3 the SUB>3<=>CaCl2+2AlFCl2;

more details:

Caf2+2Al+++<=>CA+++2AlF++.

For insoluble compounds of precious metals the overall reaction is likely to occur, as shown below, where "Nerasta.M - insoluble metal complexing agent is alumina (Al2O3), and the mineral acid is hydrochloric acid (Hcl):

The overall reaction to insoluble metal component

Ha(Nerist.M)bFwith+(ll3)+d(H2A)<=>b/2

(Nerist.M)2bO2d)+c(AlFCl2)+C(Hcl),

where b/2 ((nerist.M)2bO2d) - insoluble; c(AlFCl2) and C(Hcl) are in solution; a, b, c, d are integers, and where (ll3) obtained in the above reaction.

So, for example, insoluble metal elemental tantalum (TA) we have the following reaction:

H2F7+7ll3+2,5 H2O<=>1/t2O5+7lFl2+7l.

In all likelihood, similar reactions occur in the cooking solution and other soluble and insoluble precious metal components.

The relative ability to dissolve certain elements in the implementation of the aluminum AlF++in accordance with the following General reactions:

1 (l/x)MFx+Al3+=AlF+++Mx(+)< / BR>
11 (1/7)F7--+Al3++(2,5/7)H2O=(0,5/7)Ta2O5+lF+++(5/7)N+.

The free energy of reaction for different fluoride compounds can be estimated as follows (see tab. A).

The higher the negative value, the higher the incentive to the formation of complex fluoride with aluminum. If the free energy of the reaction becomes positive, the reaction of complex formation of aluminum fluoride will not go. As shown above, the free energy of reaction for fluoride of yttrium relatively low, however the proposed method can be successfully used for separation of fluoride from yttrium oxides of tantalum or niobium.

After cooking over a chosen period of time autoclaved sludge is subjected to the split operation on liquid and solid substance, resulting in the liquid fraction (liquid from leaching) and solid fraction (leached metal-containing product). For separation of liquid and solids, the proposed method can be used, but is not limited to, the following methods: filtration, CE is engaged, which can be separated and recovered by known methods. If the source material ore slurry contains fluoride compounds tantalum and niobium, the solid fraction from the autoclave will be enriched in tantalum and niobium composition, which can be subjected to further processing to extract these elements.

The proposed method can be further explained with reference to the following detailed description of exemplary variants of its implementation. As described above, the ore slurry, mineral acid and complexing agent are combined in the cooking pot and add water in an amount necessary to obtain a solution containing 5-40 wt.%, preferably 5-30 wt.% and most preferably 10-20 wt.% the solids. This mixture is stirred during cooking process to support virtually all solids in suspension, and incubated at a temperature of 40-100oWith, preferably 80-95oWith over 0.25 to 4.0 hours, preferably from 1.0 to 3.0 hours After cooking for a specified period of time, perform the operation of separating the liquid and solid fractions, each of which can be subjected to further processing for recovery of valuable components.

In Alcestis, having different physical properties, such as size and/or density. Operation (operation) physical separation can increase the concentration of tantalum and niobium components subsequently recovered solids. Methods of physical separation include such well-known methods, such as wet tsadka, enrichment to a concentration tables, vibration, gravity and magnetic methods, and methods using electrostatic heavy medium customarily used for separation of solids based on density, size, and/or other properties. After physical separation of the remaining sludge can be subjected to conventional separation into solid and liquid fraction, for example by thickening and filtration, followed by washing of the sludge to obtain pure fractions.

In one embodiment of the proposed method with the use of physical separation of the ore slurry, mineral acid and complexing agent are combined in the cooking pot and add water in an amount necessary to obtain a solution containing 5-40 wt.%, preferably 5-30 wt.%, most preferably 10-20 wt.% solid substances. The mixture is stirred during cooking, so that virtually all t is Ino 80-95oWith over 0.25 to 4.0 hours, preferably from 1.0 to 3.0 hours After cooking for a specified period of time the mixture is subjected to the operation of separation of particles with different physical properties, such as size and/or density, and receive at least two of the finished slurry. The operation of separation of solid and liquid fractions perform on each of the resulting sludge. If desired, the liquid fraction can be connected and be subjected to further processing for recovery of valuable components. The solid fraction obtained at the stage of separation of solid and liquid fraction, can also be subjected to further processing. In particular, one of the obtained solid fractions may contain valuable TA/Nb-components in a higher concentration than that which was obtained in the process shown in Fig.1, which makes these solids are more suitable for further processing in order to extract the TA/Nb-components.

In an alternative process, the physical phase separation may be preceded by an initial operation of cooking. Preliminary physical separation can be used to separate fractions of the original ore slurry or other metal-containing material, which can be obrabatyvatsya, can be subjected to a preliminary physical separation to obtain two fractions: a fraction with a high content of tin and low content of tantalum and niobium, fractions with low tin content and a high content of tantalum and niobium. The fraction with low tin content and a high content of tantalum and niobium can be cooked and processed in accordance with the proposed method to further increase the concentration of the precious metal components of tantalum and/or niobium. The fraction with a high content of tin and low content of tantalum and niobium can be processed further in accordance with the proposed method or other methods in order to further increase the concentration of the tin.

In Fig.1 shows schematically the proposed method, which includes retrieval operations complexing reagent. The processing stages are described only as examples and should not be interpreted as limiting the scope of the invention. In particular, subsequent processing obtained using the proposed method of solid and liquid fractions may be performed by any method, in particular by known methods.

In Fig.2 shows a graph of the influence of relationship Al/F n is As can be seen in Fig.1, after separation into liquid and solid fractions valuable metal components can be removed from the washing liquid by extraction other liquid. For example, the resulting solution can be brought into contact with hydrofluoric acid (HF) for the deposition of solid aluminum fluoride (lF3), which can be separated by filtration and recovered. The resulting solution can be lime (to ensure contact with the calcium oxide (Cao) or sodium hydroxide (NaOH) for precipitation of hydroxides of the metals, which can be separated by filtration and recovered. The resulting solution can be brought into contact with sulfuric acid (H2SO4for precipitation of gypsum (CaSO22About) and regeneration of nitric acid (HNO3). Gypsum can be separated by filtering and repair, and a solution of nitric acid can be recycled in a solution of mineral acid used in the initial cooking of ore slurry.

Specialists will be clear that the processing operation illustrated in Fig.1, can be performed on liquid fractions or the United liquid fractions obtained after separation of solid and liquid fractions in the proposed method, when used by one or more operations physioneal reduce the number of components of radioactive metals in the metal-containing material. As noted above, the advantage of the proposed method is that it gives the final leached material with a high content of valuable metal components, including tantalum, niobium and/or tin, which are not dissolved in this process, and reduced content of metal components, including radioactive metals that dissolve in the process. Thus, the present invention includes new products.

According to the invention it is also proposed leached metal-containing solid product obtained from the original metal-containing material, which consists of metallic tantalum and niobium and radioactive metal containing:

at least 5 wt.%, preferably 6 to 12 wt.%,tantalum,

at least 5 wt.%, preferably 7-14 wt.%, niobium and

not more than 5 wt.%, preferably not more than 1 wt.% radioactive metal that is present in the source material.

If the original metal-containing material comprises niobium and a minimal amount (less than 1 wt.%) tantalum, leached metal-containing solid product contains:

at least 5 wt.%, preferably 7-14 wt.% niobium

not more than 5 wt.%nelogicno, if the original metal-containing material comprises tantalum and a minimal amount (less than 1 wt.%) niobium, leached metal-containing solid product contains:

at least 5 wt.%, preferably 7-14 wt.% tantalum and

not more than 5 wt.%, preferably not more than 1 wt.% radioactive metal that is present in the source material.

According to the invention it is also proposed leached metal-containing solid product obtained from the original metal-containing material having

at least 2 times, preferably 2-30 times higher concentration of tantalum in weight than the original material,

at least 3 times, preferably 2-30 times higher concentration of niobium in weight than the original material, and

not more than 33 wt.%, preferably not more than 5 wt.%, most preferably not more than 1 weight. %, radioactive constituents present in the source material.

Tantalum as a component of the proposed products represents, basically, the oxide of tantalum (TA2O5). Similarly niobium as a component of the proposed products represents, basically, the oxide of niobium (Nb2O5).

If the original metal is electroplated tin-containing solid product derived from the original tin-containing material contains

at least 2 times, preferably 2-30 times higher concentration of tin in weight than the original material,

not more than 33 wt.%, preferably not more than 5 wt.%, most preferably not more than 1 wt.% radioactive constituents present in the source material.

Proposed according to the invention, the products can be obtained by using the proposed method, which allows to remove up to 99% of the radioactive metal components of the metal-containing source material.

Significant features and benefits of the proposed method is further illustrated by the example of specific variants of realization of the invention. In these examples, we used the following test procedures.

Elemental analysis for most elements in the ore sludge, digester sludge and liquid from leaching, was performed by the method of inductively coupled plasma installation Leeman PS 1000, the company Leeman Corporation of Massachusetts, and/or atomic absorption at the facility Perkin-Elmer 5000, the company IGCP-Elmer Corporation of Massachusetts, known to specialists.

Fluoride concentration was determined using the ion-specific electroyogi analysis.

The uranium concentration was determined by a known method fluorometric analysis.

The concentration of thorium was determined by a known method colorimetry.

Levels of alpha - and betaglucan was determined using the proportional gas flow counter radiation known to the specialist.

Examples 1-16

A series of 16 laboratory experiments performed on a sample of ore slurry weighing 30 g, taken from the industrial process of production of tantalum and niobium. The source of the ore slurry had the following composition (on dry basis) (see tab. B).

From 10 wt.% solids ore slurry, water and mineral acid was obtained an aqueous solution. As a mineral acid in each experiment used sulphuric, nitric or hydrochloric acid. The amount used of the acid was determined from the rate of 2 g of hydrogen ions (H+) per 100 g solids of ore slurry.

The cooking was carried out for 4 hours at a temperature of 80-95oC. Experiments 1, 2 and 3 were control without the use of a complexing agent. In experiments 4-16 at the beginning of cooking in water solution was added complexing agent is silicon or aluminum. The number of added complexing agent variovorax 1-3, 5 and 6 used the occulant (polyacrylamide rl 351 of the company Allied Colloids Inc.), for flocculation leached slurry to facilitate filtering slowly filterable solids.

After 4 hours of cooking liquid and residual solids were separated liquid fraction (liquid from leaching) and a solid fraction and analyzed. The solid fraction was washed, for example, in 40-133 ml of water, which was added to the liquid from leaching.

In the table are summarized In the experimental conditions.

In the tables presents the analysis of solid substances and liquids from leaching, where "M" means the ratio of moles of complexing agents to the moles of fluoride in the source material, "set." - complexing reagent, "--" - no measurements, "Shch" - liquid from leaching and T - leached solids.

1. Method of recovering valuable metal components by dissolution of the metal-containing material, having in its composition fluoride metal compounds, comprising contacting the metal-containing material with mineral acid and a complexing agent containing aluminum, silicon, titanium or mixtures thereof, heating at a temperature and pressure sufficient is at least one metal component present in the metal-containing material, and separating the resulting solids and the solution obtained after dissolution.

2. The method according to p. 1, wherein the metal-containing source material, acid and complexing agent are suspended in the water when the content of 5-40% solids and the resulting mixture is stirred to maintain almost all solids in suspension.

3. The method according to p. 1, characterized in that the temperature of the support at the level of 40-110oWith over 0,25-4,0 h

4. The method according to p. 1, characterized in that the mineral acid is nitric acid, sulfuric acid, hydrochloric acid and/or mixtures thereof.

5. The method according to p. 4, characterized in that the complexing agent is aluminum, silicon and/or mixtures thereof.

6. The method according to p. 5, characterized in that the complexing agent is used in amount at which the ratio of the molar content of the complexing agent molar content of the source material corresponds to the calculation formula

< / BR>
7. The method according to p. 6, characterized in that the acid is used in amount, in which quantities of the e after adding a complexing agent.

8. The method according to p. 7, characterized in that 0,454 kg of dry starting material used 0,045-0,91 kg acid.

9. The product obtained by the method according to p. 1.

10. The metal-containing product obtained by the method according to p. 1 from a source material containing tantalum, niobium and radioactive components containing tantalum in a concentration, by weight, exceeding at least twice the concentration in the source material, niobium concentration, by weight, exceeding at least twice the concentration in the source material, and not more than 33 weight. % of the radioactive constituents present in the source material.

11. The method of reducing the concentration of radioactive metal components present in the metal-containing material containing radioactive metal components, comprising contacting the metal-containing material with mineral acid and a complexing agent containing aluminum, silicon, titanium or mixtures thereof, heating the metal-containing material at a temperature and pressure sufficient to form the complex of the complexing agent and fluoride, and dissolving at least part of at least one metal components is received after dissolution.

12. The method of extraction of metallic tin from the tin-containing source material, containing and fluoride compounds, comprising contacting the tin-containing starting material with a mineral acid and a complexing agent at a temperature and pressure sufficient for complex formation of insoluble fluorides and dissolving at least part polovynny metal components present in the source material, and separating the resulting tin-containing material and the solution obtained after dissolution.

13. The metal-containing product obtained by the method according to p. 1 from the source material, which includes a metal tin and radioactive components containing tin at a concentration, by weight, exceeding at least twice the concentration in the source material, and not more than 33 weight. % of the radioactive constituents present in the source material.

 

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