Asynchronous enrichment and continuous determination method for platinum and gold in ore

Abstract

The invention provides an asynchronous enrichment and continuous determination method for platinum and gold in ore, and belongs to the field of content detection of platinum and gold elements in mineral, the mineral containing platinum and gold and an enrichment agent are fused, the valence state of platinum is changed, and it is guaranteed that the valence state of gold is not changed; subsequently, platinum is separated from gold in a solution form through soaking and filtering; then, the platinum element is efficiently collected from a solution obtained by soaking, filtering and separating the molten mineral by using a special chelating collecting diluent; according to the chelating collector, aliphatic cyclic dihydric alcohol serves as a raw material, chemical activities of two hydroxyl groups are different through the specific space structure of molecules, and derivatization of an asymmetric molecular skeleton is achieved through a chemical reaction; then amino is introduced, and the chemical activity of the chelating site N is improved by regulating and controlling the types of amino and substituent groups; and the specific chemical structure is combined with the chemical activity of the chelation site, so that the platinum element is efficiently collected, and the accuracy of platinum element determination can be subsequently improved.

Description

Technical Field

[0001] The invention relates to the technical field of detection of platinum and gold element contents in minerals, and in particular to a method for asynchronous enrichment and continuous determination of platinum and gold in ores. Background Art

[0002] At present, although the fire assay is a widely used method for detecting precious metals, it also has some limitations. For example: First, the operation process is relatively cumbersome and highly dependent on the operator's experience, requiring professional technicians to perform; second, it is time-consuming. Due to the need for multiple smelting and processing, the entire detection process may take several hours to several days, which is not suitable for the needs of rapid detection; third, after several precious metal elements with similar properties are enriched by lead, it is difficult to separate them by traditional ash blowing. Subsequent nitric acid boiling can remove the silver in the gold and silver particles, but the remaining particle samples also contain platinum and gold. The method of using the weight method to determine the metal content in the mineral is invalid, so the data measured by the conventional method is not accurate enough.

[0003] In view of this, it is necessary to design a method for asynchronous enrichment and continuous determination of platinum and gold in ore to solve the above problems. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a method for asynchronous enrichment and continuous determination of platinum and gold in ore, aiming to solve the technical problem that the existing detection methods have low detection accuracy for the content of platinum and gold elements in target minerals.

[0005] The present application embodiment provides a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, comprising the following steps: S1. Asynchronous separation of target minerals containing platinum and gold is performed as follows; The target mineral and the enrichment agent are mixed and then melted at high temperature to obtain a molten mineral; then the molten mineral is placed in water, soaked and filtered in sequence to separate the solid and the solution; The enrichment reagents include strong alkali reagents and oxidants; S2. The separated platinum is collected and tested for content in sequence, as follows; After mixing the solution separated in step S1 with the chelating collector diluent, the organic phase solution is collected; then a reverse collector is added to the organic phase solution, and after mixing evenly, the inorganic aqueous phase solution is collected; and the inorganic aqueous phase solution is tested for platinum content; S3. Test the content of the separated gold.

[0006] In this embodiment, a mineral containing platinum and gold elements is mixed with an enrichment agent and then subjected to high-temperature strong alkali oxidation melting to achieve a change in the form of the platinum element in the mineral, while ensuring that the valence state of gold in the mineral does not change; subsequently, the molten mineral can be soaked and filtered to separate the platinum from the mineral in the form of a solution, while the gold remains in the mineral in a solid form, thereby achieving asynchronous separation of platinum and gold in the mineral.

[0007] In some embodiments, in step S2, the chelating collector diluent is prepared by mixing a chelating collector and sulfonated kerosene in a volume ratio of 1:5-10.

[0008] In some embodiments, the chelating collector has the following structural formula: .

[0009] In this embodiment, by using a special chelating collector diluent on the solution separated from the melted mineral after soaking and filtering, platinum can be efficiently captured in a strong alkaline environment; wherein, the chelating collector uses aliphatic cyclic diols as raw materials, utilizes the unique spatial structure of the molecule to make the chemical activity of the two hydroxyl groups different, and realizes the derivatization of the asymmetric molecular skeleton through chemical reaction (through nucleophilic substitution reaction, the highly active hydroxyl group is converted into a chloro group, while the less active hydroxyl group does not undergo nucleophilic substitution reaction, ensuring that one side of the original molecular skeleton is derivatized); then, an amine group of a specific structure is introduced, and the original binary hydroxyl group in the amine compound can realize the improvement of the chemical activity of the chelating site N; in this way, under strong alkaline conditions, the specific chemical structure combined with the chemical activity of the chelating site can realize the efficient capture of platinum.

[0010] In some embodiments, in step S1, the melting temperature is 500-700°C.

[0011] In some embodiments, in step S1, the mass ratio of the strong base agent to the oxidant in the enrichment agent is 10~100:1; the strong base agent includes one or more of sodium hydroxide and potassium hydroxide; the oxidant includes one or more of sodium perchlorate, potassium perchlorate, sodium perbromate, and potassium perbromate.

[0012] In some embodiments, in step S1, the mass ratio of the target mineral to the enrichment agent is 1:1-5; The ratio of the molten mineral to water is 1-50 g:1 L.

[0013] In some embodiments, in step S2, the volume ratio of the solution to the chelating collector diluent is 1000:1-10.

[0014] In some embodiments, in step S2, the reverse collector includes one or more of a saturated solution of ammonium chloride and aqueous ammonia; the volume ratio of the reverse collector to the chelating collector diluent is 2 to 5:1.

[0015] In some embodiments, in step S2, the method for testing the platinum content of the inorganic aqueous solution comprises ICP-OES.

[0016] In some embodiments, in step S3, the method for testing the content of the separated gold includes fire assay.

[0017] Beneficial effects: The present invention achieves the transformation of the existence form of the platinum element in the mineral by mixing the mineral containing platinum and gold elements with an enrichment agent, and then oxidizing and melting the mineral with a high temperature strong alkali, while ensuring that the gold in the mineral does not change in valence state; subsequently, the molten mineral can be soaked and filtered to separate the platinum from the mineral in the state of a solution, while the gold remains in the mineral in a solid form, so that the platinum and gold in the mineral are firstly separated asynchronously; then, a special chelating collector diluent is used on the solution separated from the melted mineral after soaking and filtering, so that the platinum element can be efficiently captured in a strong alkaline environment; wherein, the chelating collector uses an aliphatic cyclic diol as a raw material, utilizes the unique spatial structure of the molecule to make the chemical activity of the two hydroxyl groups different, and realizes the derivatization of the asymmetric molecular skeleton through a series of chemical reactions; subsequently, an amine group is introduced, and the chemical activity of the chelating site N is increased by regulating the types of the amine group and the substituent; thus, under strong alkaline conditions, the specific chemical structure is combined with the chemical activity of the chelating site to achieve efficient capture of the platinum element, so that the subsequent accurate determination of the platinum element is completed.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The synthesis process of the chelating collector in this application; Figure 2 It is the hydrogen nuclear magnetic resonance spectrum of the chelating collector in this application. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0023] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] In the prior art, the determination methods for the content of platinum and gold in minerals mostly use the fire assay method, but the fire assay method does not have high enough measurement accuracy for the content of precious metal elements with similar properties. Therefore, it is particularly important to provide a determination method that can accurately distinguish the content of precious metal elements with similar properties in minerals.

[0027] In order to solve the above-mentioned technical problems, the present application provides a method for asynchronous enrichment and continuous determination of platinum and gold in ore, wherein a mineral containing platinum and gold elements is mixed with an enrichment agent and then oxidized and melted with a high temperature strong alkali to achieve a change in the existence form of the platinum element in the mineral, while ensuring that the valence state of gold in the mineral does not change; subsequently, a special chelating collection diluent is used on the solution separated from the melted mineral after soaking and filtration, so that the platinum element is efficiently collected in a strong alkaline environment; in this way, after achieving efficient separation of platinum and gold in the mineral, each element is measured separately, thereby ensuring the technical effect of accurately determining the precious metal content in the mineral.

[0028] The present application embodiment provides a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, comprising the following steps: S1. Asynchronous separation of target minerals containing platinum and gold is performed as follows; The target mineral and the enrichment agent are mixed and then melted at high temperature. After reacting for 4 to 6 hours, a molten mineral is obtained (to transform the existing form of the platinum element in the target mineral). Then, the molten mineral is placed in water, soaked and filtered in sequence to separate the solid and the solution; The enrichment reagents include strong alkali reagents and oxidants; The melting temperature is 500~700℃; The mass ratio of target mineral to enrichment agent is 1:1~5; The ratio of the molten mineral to water is 1-50 g:1 L; The mass ratio of the strong alkali agent to the oxidant in the enrichment agent is 10-100:1; the strong alkali agent includes one or more of sodium hydroxide and potassium hydroxide; the oxidant includes one or more of sodium perchlorate, potassium perchlorate, sodium perbromate and potassium perbromate; S2. The separated platinum is collected and tested for content in sequence, as follows; The solution separated in step S1 is mixed with a chelating collector diluent in a volume ratio of 1000:1-10, stirred for 30 minutes, and an organic phase solution is collected; a reverse collector is added to the organic phase solution, mixed, stirred for another 30 minutes, and an inorganic aqueous phase solution is collected; and the inorganic aqueous phase solution is tested for platinum content; The reverse collector includes one or more of a saturated solution of ammonium chloride and ammonia water (the concentration of ammonia water is 30%); the volume ratio of the reverse collector to the chelating collector diluent is 2-5:1; The method for testing the platinum content of the inorganic aqueous solution includes ICP-OES; The calculation formula for platinum content is: W Pt =C × V / m ×100%; in, W Pt ——Content of platinum in the target mineral (%); C ——Mass concentration of platinum in inorganic aqueous solution; V ——The volume of inorganic aqueous solution; m ——The quality of the target mineral.

[0029] S3. Test the content of the separated gold. The method for testing the content of separated gold includes fire assay, and the specific determination steps refer to GB / T7739.

[0030] In this way, the mineral containing platinum and gold elements is mixed with an enrichment agent, and then oxidized and melted with a high temperature strong alkali to achieve the transformation of the existence form of the platinum element in the mineral, while ensuring that the valence state of gold in the mineral does not change; subsequently, the molten mineral can be soaked and filtered to separate the platinum from the mineral in the form of a solution, while the gold remains in the mineral in a solid form, thus achieving the asynchronous separation of platinum and gold in the mineral; Among them, taking potassium hydroxide and potassium perchlorate as examples: Pt+KOH+KClO 3 →K 2 PtO 4 +KCl+H 2 O; During the reaction, platinum (Pt) melts with potassium hydroxide and potassium chlorate to form soluble potassium platinum (IV) oxide (K 2 PtO 4 ), while the gold element still exists in the form of elemental gold, thus achieving the separation of elements with similar properties.

[0031] Furthermore, in some embodiments, in step S2, the chelating collector diluent is prepared by mixing a chelating collector and sulfonated kerosene in a volume ratio of 1:5-10.

[0032] Further, in some embodiments, the chelating collector has the following structural formula: ; The synthesis process of the chelating collector is as follows Figure 1 As shown, the specific preparation method comprises the following steps: A1. Synthesize isosorbide into compound B; (For the specific synthesis route and parameters of the preparation method, please refer to the reference "Hydroformylation of Olefinic Derivatives of Isosorbide and Isomannide. J. Org. Chem. 2016, 81, 7510−7517.") A2. Add N-di-2-hydroxyethylamine and the compound B prepared in the above steps to a sufficient amount of anhydrous ethanol at a molar ratio of 1.5-3:1; then add an appropriate amount of sodium hydroxide (wherein, anhydrous ethanol: sodium hydroxide = 1L: 6-8g); then react at 50-100°C for 48-72h; after the reaction is completed, remove the solvent by rotary distillation under reduced pressure, and collect a light yellow oil; then add deionized water, ultrasonically dissolve, filter, and remove inorganic substances (alkali, salt); finally, add 200ml-1L of cyclohexane and 200ml-1L of deionized water and extract, collect the organic phase, dry it with anhydrous magnesium sulfate, filter, and collect the liquid phase, and then perform rotary distillation under reduced pressure on the collected liquid phase to remove the solvent, and finally obtain an oily product C, i.e., a chelating collector, with a yield of 57-62%.

[0033] In this way, by using a special chelating collector diluent on the solution separated from the molten mineral after soaking and filtration, the platinum element can be efficiently captured in a strongly alkaline environment; wherein, this chelating collector uses aliphatic cyclic diols as raw materials, utilizes the unique spatial structure of the molecule to make the two hydroxyl groups have different chemical activities, and realizes the derivatization of the asymmetric molecular skeleton through a series of chemical reactions; then, the amine group is introduced, and the chemical activity of the chelating site N is increased by regulating the types of amine groups and substituents; thus, under strongly alkaline conditions, the specific chemical structure combined with the chemical activity of the chelating site can realize the efficient capture of the platinum element, thus completing the subsequent precise determination of the platinum element.

[0034] Furthermore, in some embodiments, in step S2, the reverse collector includes one or more of a saturated solution of ammonium chloride and ammonia water; and the volume ratio of the reverse collector to the chelating collector diluent is 2-5:1.

[0035] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0036] Example 1 The present application embodiment provides a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, comprising the following steps: S1. Asynchronous separation of target minerals containing platinum and gold is performed as follows; A standard ore sample (10 g) (the gold content in the standard ore sample is 11.51 g / t, and the platinum content is 26.7 g / t) and an enrichment agent (50 g) (the enrichment agent is composed of potassium hydroxide and potassium perchlorate in a mass ratio of 49 g:1 g) are mixed at a mass ratio of 1:5, and then melted at a high temperature of 600°C. After reacting for 4 hours, a molten mineral is obtained; then the crushed molten mineral is placed in water (the ratio of the molten mineral to water is 10 g:1 L), and soaked (30 min) and filtered in turn to separate the solid and the solution; S2. The separated platinum is collected and tested for content in sequence, as follows; Add 5 mL of chelating collector diluent to the solution obtained in step S1, mix, stir for 30 minutes, and collect the organic phase solution; then add 20 mL of reverse collector (saturated solution of ammonium chloride) to the organic phase solution, mix, stir for another 30 minutes, and collect the inorganic aqueous phase solution; and test the inorganic aqueous phase solution for platinum content; The chelating collector diluent is prepared by mixing a chelating collector and sulfonated kerosene in a volume ratio of 1:5; the structural formula of the chelating collector is as follows: ; Among them, the synthesis route of the chelating collector in this application is as follows Figure 1 As shown, the specific preparation method comprises the following steps: A1. Synthesize isosorbide into compound B; (For the specific synthesis route and parameters of the preparation method, please refer to the reference "Hydroformylation of Olefinic Derivatives of Isosorbide and Isomannide. J. Org. Chem. 2016, 81, 7510−7517."); A2, in a molar ratio of 3:1, N-di-2-hydroxyethylamine and the compound B prepared in the above steps are added to 2L of anhydrous ethanol; then 32g of sodium hydroxide is added, and the concentration of sodium hydroxide is 0.4mol / L; then the reaction is carried out at 80°C for 72h; after the reaction is completed, the solvent is removed by rotary evaporation under reduced pressure distillation, and a light yellow oil is collected; then deionized water is added, ultrasonically dissolved, filtered, and inorganic substances (alkali, salt) are removed; finally, 1L of cyclohexane and 1L of deionized water are added and extracted, the organic phase is collected, and dried with anhydrous magnesium sulfate, filtered, and the liquid phase is collected, and the collected liquid phase is subjected to rotary evaporation under reduced pressure distillation to remove the solvent, and finally an oily product C, i.e., a chelating collector, is obtained, and its yield is 57-62%; H NMR spectrum of chelating collector ( 1 H-NMR) data are: chemical shift 2.00~2.99, 4H; 3.00~3.99, 7H; 4.00~4.50, 6H; H-NMR spectrum is as follows Figure 2 shown.

[0037] The method for testing the platinum content of the inorganic aqueous solution is ICP-OES; The calculation formula for platinum content is: W Pt = C × V / m ×100%; in, W Pt ——Content of platinum in the target mineral (%); C ——Mass concentration of platinum in inorganic aqueous solution; V ——The volume of inorganic aqueous solution; m — the quality of the target mineral; S3. Test the content of the separated gold. The method for testing the content of separated gold is fire assay, and the specific process refers to GB / T 7739.

[0038] in, .

[0039] Embodiment 2-3 Examples 2 and 3 respectively provide a method for asynchronous enrichment and continuous determination of platinum and gold in an ore. The difference from Example 1 is that the target mineral selected in step S1 is different. The target mineral selected in Example 2 is a standard ore sample with a standard gold content of 120.89 g / t and a platinum content of 17.6 g / t; the target mineral selected in Example 3 is a standard ore sample with a standard gold content of 5.00 g / t and a platinum content of 897.1 g / t. The remaining steps are consistent with Example 1 and will not be repeated here.

[0040] The specific measurement results of Examples 1 to 3 are shown in Table 1.

[0041] Table 1 Standard values ​​and experimental values ​​of element contents in target minerals of Examples 1 to 3 As can be seen from Table 1, the present application provides an efficient asynchronous enrichment and continuous determination method for platinum and gold, which has high accuracy and an error range of less than 3% in standard mineral samples with different content ratios, meeting the requirements of existing tests and their standards.

[0042] Embodiment 4-5 Embodiments 4 and 5 provide a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, respectively. The difference from Embodiment 1 is that the enrichment reagents in step S1 are different. The ratio of the strong base reagent to the oxidant in the enrichment reagent of Embodiment 4 is 10:1; the ratio of the strong base reagent to the oxidant in the enrichment reagent of Embodiment 5 is 90:1. The remaining steps are consistent with those in Embodiment 1 and will not be repeated here.

[0043] Embodiment 6-7 Examples 6 and 7 respectively provide a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, which differs from Example 1 in that the content of the reverse collector in step S2 is different, the volume ratio of the reverse collector to the chelating collector diluent in Example 6 is 2:1, and the volume ratio of the reverse collector to the chelating collector diluent in Example 7 is 5:1. The steps are consistent with those in Example 1 and will not be repeated here.

[0044] Comparative Example 1 Comparative Example 1 provides a method for asynchronous enrichment and continuous determination of platinum and gold in ore, which is different from Example 1 in that the enrichment reagent in step S1 is different, and the ratio of the strong base reagent to the oxidant in the enrichment reagent of Comparative Example 1 is 8:1. The steps are consistent with those of Example 1 and will not be repeated here.

[0045] Comparative Examples 2~3 Comparative Examples 2 and 3 respectively provide a method for asynchronous enrichment and continuous determination of platinum and gold in an ore, which differs from Example 1 in that the content of the reverse collector in step S2 is different, the volume ratio of the reverse collector to the chelating collector diluent in Comparative Example 2 is 1:1; the volume ratio of the reverse collector to the chelating collector diluent in Comparative Example 3 is 7:1. The remaining steps are consistent with Example 1 and will not be repeated here.

[0046] The specific measurement results of Examples 4-6 and Comparative Examples 1-2 are shown in Table 2.

[0047] Table 2 Standard values ​​and experimental values ​​of element contents in target minerals of Examples 4 to 6 and Comparative Examples 1 to 2 The reason for the large error in Comparative Example 3 is that there is too much reverse collector and it cannot be completely dissolved.

[0048] Comparative Examples 4-5 Comparative Examples 4 and 5 respectively provide a method for asynchronous enrichment and continuous determination of platinum and gold in an ore. The difference from Example 1 is that the types of chelating collector diluents in step S2 are different. The specific structural formulas of the chelating collectors in the reverse collectors in Comparative Examples 4 and 5 are shown in Table 3. The remaining steps are consistent with Example 1 and are not repeated here. The final determination results of the capture capacity of platinum and each element in the mineral of Comparative Examples 4 and 5 are shown in Table 3.

[0049] Table 3 The capture capacity of platinum and the determination results of each element in the minerals of Example 1 and Comparative Examples 4-5 As shown in Table 3, the chelating collector prepared in Example 1 has an excellent chelating effect on platinum, while the chelating collectors involved in Comparative Examples 4-5 cannot effectively chelate with platinum. The main reason is that the molecular spatial structures of the chelating collectors are different: the chelating collector in Example 1 is a ring structure with spatial specificity - a spatial V-shaped structure; while the chelating collectors in Comparative Examples 4-5 have a binary ring structure in the same plane, which makes it difficult to achieve the coordinated chelation of the target metal ion with the oxygen atom of the N atom and the para-hydroxyl group of the heterocyclic ring, so that a stable chelate cannot be formed; this difference in spatial structure leads to a difference in the chelating effect on the platinum element.

[0050] As can be seen from Tables 2-3, the present application provides an efficient asynchronous enrichment and continuous determination method for platinum and gold, which can achieve accurate determination of platinum and gold in minerals only under the synergistic effect of various reagents.

[0051] In addition, the prepared chelating collector was tested for its ability to capture platinum under alkaline conditions: K to 1L 2PtO 4 Alkaline solution (where K 2 PtO 4 10 mL of a chelating collector diluent was added to the mixture (the concentration of which is 10 mg / L), wherein the volume ratio of the chelating collector to the sulfonated kerosene in the chelating collector diluent is 1:9, and the mixture was stirred for 30 min, and the organic phase solution was collected; 20 mL of a saturated solution of ammonium chloride was added to the collected organic phase solution, and the mixture was stirred for 30 min, and the inorganic aqueous phase solution was collected. The platinum concentration was detected by ICP-OES, and the collection capacity of the chelating collector diluent was determined according to the following formula.

[0052] K 2 PtO 4 The pH value of the alkaline solution in the alkaline solution varies from 8 to 14. The specific experimental value range is shown in Table 4.

[0053] Platinum content (%) = C 1 × V 1 / ( C 0 × V 0 )×100% in, C 1 ——The concentration of platinum in inorganic aqueous solution detected by ICP-OES; V 1 ——The volume of reverse collector (saturated solution of ammonium chloride); C 0 ——K used in the experiment 2 PtO 4 concentration; V 0 ——K used in the experiment 2 PtO 4 The volume of the alkaline solution.

[0054] The capture capacity of the chelating collector diluent for platinum is affected by K 2 PtO 4 The results of the influence of pH in alkaline solution are shown in Table 4.

[0055] Table 4 Effect of chelating collector diluent on platinum in K 2 PtO 4 The capture capacity of alkaline solution in different pH environments As shown in Table 4, the capture capacity of the prepared chelating collector diluent for platinum under alkaline conditions is significantly affected by pH, and the extraction effect is above 99% within a specific pH range (11-14). 2 PtO 4 Hydrolysis will generate precipitation, which will affect the collection effect of the chelating collector diluent in the solution. In addition, in subsequent experiments, after the asynchronous separation process of natural minerals containing platinum and gold elements, the pH of the solution was greater than 11. This phenomenon ensures the best applicable conditions for the chelating collector and provides a prerequisite for the determination of the platinum content in the ore sample.

[0056] In summary, the method for asynchronous enrichment and continuous determination of platinum and gold in ore provided by the present invention is to achieve the transformation of the existence form of the platinum element in the mineral by mixing the mineral containing platinum and gold elements with an enrichment agent, and then subjecting the mineral to high-temperature strong alkali oxidation melting, while ensuring that the valence state of gold in the mineral does not change; subsequently, the molten mineral can be soaked and filtered to separate the platinum from the mineral in the form of a solution, while the gold remains in the mineral in a solid form, so that the platinum and gold in the mineral are firstly separated asynchronously; then, the solution separated from the melted mineral after soaking and filtering is treated with a special chelate The combined capture diluent can efficiently capture platinum in a strongly alkaline environment; among them, this chelating collector uses aliphatic cyclic diols as raw materials, utilizes the unique spatial structure of the molecule to make the two hydroxyl groups have different chemical activities, and realizes the derivatization of the asymmetric molecular skeleton through a series of chemical reactions; then, the amine group is introduced, and the chemical activity of the chelating site N is increased by regulating the types of amine groups and substituents; in this way, under strongly alkaline conditions, the specific chemical structure combined with the chemical activity of the chelating site can realize the efficient capture of platinum, thus completing the subsequent precise determination of platinum.

[0057] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for asynchronous enrichment and continuous determination of platinum and gold in ore, characterized in that: The method comprises the following steps: S1, asynchronously separating target minerals containing platinum and gold, as follows: The target mineral and the enrichment agent are mixed and then melted at high temperature to obtain a molten mineral; then the molten mineral is placed in water, soaked and filtered in sequence to separate the solid and the solution; The enrichment reagents include strong alkali reagents and oxidants; S2. The separated platinum is collected and tested for content in turn, as follows: After mixing the solution separated in step S1 with the chelating collector diluent, the organic phase solution is collected; then a reverse collector is added to the organic phase solution, and after mixing evenly, the inorganic aqueous phase solution is collected; and the inorganic aqueous phase solution is tested for platinum content; S3. Test the content of the separated gold.

2. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 1, characterized in that: In step S2, the chelating collector diluent is prepared by mixing a chelating collector and sulfonated kerosene in a volume ratio of 1:5-10.

3. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 2, characterized in that: The chelating collector structural formula is as follows: 。 4. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 3, characterized in that: In step S1, the melting temperature is 500-700°C.

5. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 3, characterized in that: In step S1, the mass ratio of the strong base agent to the oxidant in the enrichment agent is 10-100:1; the strong base agent includes one or more of sodium hydroxide and potassium hydroxide; the oxidant includes one or more of sodium perchlorate, potassium perchlorate, sodium perbromate, and potassium perbromate.

6. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 5, characterized in that: In step S1, the mass ratio of the target mineral to the enrichment agent is 1:1-5; The ratio of the molten mineral to water is 1-50 g:1 L.

7. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 3, characterized in that: In step S2, the volume ratio of the solution to the chelating collection diluent is 1000:1-10.

8. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 1, characterized in that: In step S2, the reverse collector includes one or more of a saturated solution of ammonium chloride and aqueous ammonia; the volume ratio of the reverse collector to the chelating collector diluent is 2-5:

1.

9. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 1, characterized in that: In step S2, the method for testing the platinum content of the inorganic aqueous solution includes ICP-OES.

10. The method for asynchronous enrichment and continuous determination of platinum and gold in ore according to claim 1, characterized in that: In step S3, the method for testing the content of the separated gold includes fire assay.

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