A method for beneficiating uranium-containing gold ore

Abstract

The invention discloses a method for beneficiating uranium-containing gold ore. According to the mineral composition characteristics of the uranium-containing gold ore and the distribution characteristics of useful minerals, the uranium-containing gold ore is crushed, ground and classified, the coarse-grained ore is firstly recovered by a shaking table, and then a flotation agent composed of a water glass inhibitor, a sodium hydrosulfide activator, an amyl xanthate and an alkylaminocarboxylic acid combined collector is used to flotate and recover the gold; the fine-grained ore is recovered by centrifugal reselection, and then the coarse-grained and fine-grained tailings are combined, and a flotation agent composed of a lead nitrate and ferric sulfate combined activator, an isooctyl phosphate and a tetradecylamine combined collector is used to flotate and recover uranium, and finally the uranium is further recovered by strong magnetism, which not only realizes the comprehensive recovery of gold and uranium, but also can discard most of the tailings. The gold grade in the total gold concentrate is 56.34g / t, the recovery rate is 97.08%, the uranium grade in the total uranium concentrate is 0.196%, the recovery rate is 70.59%, the tailings yield is 87.06%, the gold grade is 0.14g / t, and the uranium grade is 0.003%.

Description

Technical Field

[0001] The invention relates to a beneficiation method for uranium-gold ore, in particular to a beneficiation method for separating and recovering uranium and gold from uranium-gold ore, belonging to the technical field of beneficiation. Background Art

[0002] Uranium-containing gold ores in the prior art, for example, contain a certain amount of uranium in a certain gold mine. Gold mainly coexists with heavy metal minerals and sulfides. About 47% of uranium is in -0.025mm particle size ore, and 37% of uranium is in light minerals. At present, the main recovery process for this type of gold mine is to directly use the full mud cyanidation method to extract gold. The tailings after gold extraction are directly discharged into the tailings pond. The associated uranium in the ore enters the tailings pond with the tailings. A large amount of radioactive tailings are stored, which causes environmental pollution on the one hand, and precious uranium resources are not utilized on the other hand, resulting in a waste of resources. In addition, the mined ore is not sorted and discarded, and all the ore is directly ground and leached, resulting in a large amount of ore processing and high production costs.

[0003] Check the development and utilization of uranium-containing gold mines at home and abroad. For example, the metals that can be comprehensively utilized in the Olympic Dam copper-uranium mine include copper, gold, silver, uranium and rare earths, and there are useful minerals such as uranium bornite, chalcocite, chalcopyrite, crystalline uraninite, uraninite and titanouraninite. The flotation method is used to separate uranium and copper. The flotation concentrate contains 25% copper and 0.1% uranium, and the flotation tailings contain 0.3% copper and most of the uranium. The flotation concentrate and tailings are leached separately, and metallic copper, uranium, gold and silver are recovered from the flotation concentrate, and uranium and copper are recovered from the flotation tailings. This process only flotation groups the ore by flotation, but does not achieve the separation of uranium minerals and other metal minerals, nor does it achieve tailings disposal, reducing the subsequent water-metallurgical ore processing volume. Summary of the invention

[0004] In view of the problems existing in the prior art of the beneficiation process for uranium-containing gold ore, such as large ore processing volume, high production cost, unrecovered uranium, large stockpile of radioactive tailings, etc., the purpose of the present invention is to provide a beneficiation method for uranium-containing gold ore. According to the composition characteristics of the uranium-containing gold ore and the distribution characteristics of useful minerals, the method preferably adopts technical means such as graded gravity separation combined with flotation to enrich and recover gold, and then adopts technical means such as flotation combined with magnetic separation to enrich and recover uranium, thereby achieving efficient enrichment of uranium and gold in the uranium-containing gold ore, and separating and recovering them, and can reduce the uranium content in the tailings to make it meet the standard of radioactive exemption.

[0005] In order to achieve the above technical objectives, the present invention provides a method for beneficiating uranium-gold ore, which comprises the following steps:

[0006] 1) crushing, grinding and classifying the uranium-gold ore in sequence to obtain coarse-grained ore and fine-grained ore;

[0007] 2) The coarse-grained ore is subjected to a shaking table gravity separation to obtain gravity separation gold concentrate I and gravity separation gold tailings I;

[0008] 3) The gravity gold tailings I are slurried I and then enter flotation I, with water glass as a depressant, sodium hydrosulfide as an activator, amyl xanthate and alkyl aminocarboxylic acid as collectors, and a frother, and a roughing and multiple cleaning are performed to obtain a flotation gold concentrate;

[0009] 4) The fine-grained ore is re-selected by a centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0010] 5) The gold tailings obtained from the roughing and the gold tailings from the gravity separation II are combined and slurried in II, and then enter flotation II, using lead nitrate and ferric sulfate as activators, isooctyl phosphate and tetradecylamine as collectors, and performing one roughing, one scavenging and multiple cleaning to obtain a flotation uranium concentrate;

[0011] 6) The uranium tailings obtained by scavenging are sent to magnetic separation to obtain magnetic uranium concentrate and magnetic tailings.

[0012] In view of the ore composition characteristics of uranium-containing gold ore and the distribution characteristics of useful minerals, gold therein mainly exists in the form of single gold and is distributed in heavy metal minerals and closely coexists with sulfide minerals, while uranium exists in uranium minerals such as pitchblende, uraninite and uraniumite, and is relatively scattered in the ore. The technical solution of the present invention adopts a method combining graded gravity separation and flotation to preferably recover gold, grinds the uranium-containing gold ore and appropriately separates it, and the single gold particles existing in the coarse-grained ore can be recovered by a shaking table by utilizing the difference in specific gravity, and the bound gold existing in the coarse-grained ore is recovered by flotation by using water glass to inhibit gangue minerals, sodium hydrosulfide to activate gold-containing minerals, and using a special amyl xanthate and alkylaminocarboxylic acid combined collector, while the gold in the fine-grained ore mainly exists in the form of single gold particles and can be recovered by centrifugal gravity separation. The gold grade in the total gold concentrate is 56.34 g / t, and the recovery rate is 97.08%. After gold selection, the coarse-grained and fine-grained tailings are combined, and the uranium-containing minerals are efficiently activated by using a combination of lead nitrate and ferric sulfate as activators. At the same time, isooctyl phosphate and tetradecylamine are used as uranium mineral collectors to float out the activated pitchblende, uranium stone and titanouraninite. Finally, the weakly magnetic titanouraninite is further recovered by strong magnetism, further improving the uranium recovery rate. The uranium grade in the total uranium concentrate is 0.196%, and the recovery rate is 70.59%. This method realizes the comprehensive recovery of gold and uranium in uranium-containing gold ores, and the final tailings have a high yield, low gold and uranium residues, a gold grade of 0.14g / t, and a uranium grade of 0.003%, which can meet the standards for radioactive exemption and can be directly discarded.

[0013] As a preferred solution, the uranium-containing gold ore is ground to a particle size of -0.074 mm, and the mass percentage content is 65-95%. Grinding the uranium-containing gold ore to a preferred particle size range can fully strip the gangue minerals and release the elemental gold, which is beneficial to the subsequent separation process of the elemental gold.

[0014] As a preferred solution, the classification adopts a 0.025mm screen. The classification of uranium-containing gold ore treated by grinding is mainly aimed at the recovery process of gold ore. It is difficult to achieve efficient recovery of gold ore in -0.025mm particle size ore and +0.025mm particle size ore in the same gravity separation equipment. When the uranium-containing gold ore is classified by a 0.025mm screen, the gold ore in the +0.025mm particle size ore can be enriched and recovered by using a shaking table gravity separation, while the gold ore in the -0.025mm particle size ore can be enriched and recovered by using a centrifugal concentrator gravity separation. The gold in the -0.025mm ore is relatively fine and can only be recovered by centrifugal separation. In addition, the -0.025mm ore has a low sulfide mineral content and does not need to be recovered by flotation. The gold in the +0.025mm ore is relatively large and can be recovered by gravity separation on a shaking table with a large ore processing capacity. The gold coexisting with sulfide minerals in the gravity separation tailings can be recovered by flotation. The gold recovery rate can be significantly improved by graded gravity separation.

[0015] As a preferred solution, the slurry adjustment I adjusts the mass concentration of the slurry to 10-45%.

[0016] As a preferred solution, the reagent system of the flotation I is: 100-1500 g / t of water glass, 100-800 g / t of sodium hydrosulfide, 50-500 g / t of amyl xanthate, 30-300 g / t of alkylaminocarboxylic acid, and 20-100 g / t of frother; the frother is sec-octanol. The combination of amyl xanthate and alkylaminocarboxylic acid is mainly based on the complementarity of the two in the flotation activity and selectivity of pyrite with different oxidation degrees, so that the complete capture of pyrite can be achieved, so that the gold associated with sulfide minerals can be fully recovered, and the flotation recovery rate of gold can be improved. The combined use of amyl xanthate and alkylaminocarboxylic acid in an appropriate ratio has a better capture effect than the use of amyl xanthate alone to float pyrite.

[0017] As a preferred solution, the pulping II adjusts the mass concentration of the ore pulp to 10-45% and the pH to 3-6.5. Adjusting the ore pulp to a weakly acidic condition is conducive to the adsorption of metal activation ions in the activator on the surface of the target mineral.

[0018] As a preferred solution, the reagent system of flotation II is: 100-1000 g / t of lead nitrate, 100-1000 g / t of ferric sulfate, 50-600 g / t of isooctyl phosphate, and 30-500 g / t of tetradecylamine. Lead nitrate and ferric sulfate mainly produce Pb by dissociation. 2+ and Fe 3+ Ions, these metal ions can be adsorbed on the surface of uranium oxides to form active sites, which can enhance the adsorption of collectors on the surface of uranium minerals. In view of the characteristics that uranium minerals in minerals are mainly pitchblende, uraninite and titanouraninite, isooctyl phosphate is used in combination with tetradecylamine. The two contain different polar groups. The coordinated combination of the two polar groups shows a strong binding ability to the surface of uranium minerals after activation and modification of lead ions and iron ions. It can not only act on the uranium ions exposed on the surface of uranium minerals, but also can bind to the Pb adsorbed on the surface of uranium minerals. 2+ and Fe 3+ Ion binding makes the surfaces of various uranium minerals hydrophobically modified, thereby improving the flotation recovery rate of uranium.

[0019] As a preferred solution, the reagent system for the scanning is: 20-200 g / t of isooctyl phosphate and 10-100 g / t of tetradecylamine.

[0020] As a preferred solution, the magnetic field strength used in the magnetic separation is 0.8~2.0T.

[0021] As a preferred solution, the centrifugal concentrator is preferably a Nelson centrifugal concentrator.

[0022] As a preferred solution, the classification is achieved by using a hydrocyclone.

[0023] The uranium-containing gold ore dressing method provided by the present invention comprises the following steps:

[0024] (1) Ore crushing and grinding:

[0025] Crushing the ore to -10mm;

[0026] Grinding the crushed ore to a fineness of -0.074mm accounts for 65~95%.

[0027] (2) Ore classification:

[0028] The ground ore is classified by a hydrocyclone to be divided into two groups: -0.025 mm particle size ore and +0.025 mm particle size ore.

[0029] (3) Recovery of gold from +0.025 mm particle size ore:

[0030] 1) Re-selection recovery gold:

[0031] The ore with a particle size of +0.025 mm is re-selected using a shaking table to obtain re-selected gold concentrate I and re-selected gold tailings I;

[0032] 2) Flotation recovery of gold:

[0033] ① The pulp concentration of the above-mentioned gravity gold tailings I is adjusted to an ore mass fraction of 10-45%, 100-1500 g / t of water glass as a gangue mineral inhibitor is added, and the flotation machine is stirred at a speed of 1000-2500 r / min for 3-15 min, 100-800 g / t of sodium hydrosulfide as an activator is added, and the flotation machine is stirred at a speed of 1000-2500 r / min for 3-15 min, 50-500 g / t of amyl xanthate as a collector and 30-300 g / t of alkylaminocarboxylic acid are added, and the flotation machine is stirred at a speed of 1000-2500 r / min for 3-15 min, 20-100 g / t of octanol as a foaming agent is added, and the flotation machine is stirred at a speed of 1000-2500 r / min for 3-15 min, and the mineral is fully contacted with the reagent and then aerated and roughly selected to obtain a rough gold concentrate and a rough gold tailings;

[0034] ② The above rough gold concentrate is subjected to multiple concentrations without adding reagents during the concentration process until the ideal flotation index is reached to obtain flotation gold concentrate, and the flotation tailings are returned to the previous level of flotation in turn.

[0035] (4) Recovery of gold from -0.025 mm particle size ore:

[0036] The -0.025mm particle size ore is re-selected using the Nelson centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0037] Flotation recovery of uranium minerals:

[0038] Combining the rougher gold tailings and the gravity gold tailings II to obtain the gold tailings;

[0039] The concentration of the gold tailings pulp is adjusted to an ore mass fraction of 10-45%, sulfuric acid is added to adjust the pH value, and the pH value of the pulp is adjusted to 3-6.5;

[0040] Add 100-1000 g / t of lead nitrate and 100-1000 g / t of ferric sulfate as activators to the ore pulp, stir the ore at a speed of 1000-2500 r / min for 3-15 min on a flotation machine, add 50-600 g / t of isooctyl phosphate and 30-500 g / t of tetradecylamine as collectors, stir the ore at a speed of 1000-2500 r / min for 3-15 min on a flotation machine, and aerate and roughen the ore after the ore is fully contacted with the reagents to obtain rougher uranium concentrate and rougher uranium tailings;

[0041] Adding 20-200 g / t of isooctyl phosphate and 10-100 g / t of tetradecylamine as collectors to the rough uranium tailings, stirring the flotation machine at a speed of 1000-2500 r / min for 3-15 min, aerating and scavenging the ore after the ore and the reagent are fully contacted, to obtain scavenged uranium concentrate and scavenged uranium tailings;

[0042] The roughing uranium concentrate and scavenging uranium concentrate are combined and subjected to multiple concentrations without adding reagents during the concentration process until the ideal flotation index is reached to obtain a flotation uranium concentrate, and the flotation tailings are returned to the previous flotation stage in sequence.

[0043] (6) Strong magnetic recovery of uranium minerals:

[0044] The above-mentioned scavenged uranium tailings are subjected to magnetic separation by a strong magnetic separator under the condition of a magnetic field strength of 0.8-2.0T to recover weakly magnetic uranium minerals to obtain magnetically separated uranium concentrate and tailings.

[0045] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0046] Aiming at the problems of large ore processing volume, high production cost, unrecovered uranium, large stockpile of radioactive tailings, etc. in the process of treating uranium-containing gold ore in the existing process, the present invention adopts the ore composition characteristics of the uranium-containing gold ore and the distribution characteristics of useful minerals, preferably adopts the technical means of graded gravity separation combined with flotation to enrich and recover gold, and then adopts the technical means of flotation combined with magnetic separation to enrich and recover uranium, so as to achieve efficient enrichment of uranium and gold in the uranium-containing gold ore, separate and recover them, and reduce the uranium content in the tailings to make it meet the standard of radioactive exemption. In the process of gold recovery, the uranium-containing gold ore after fine grinding contains gold particles of different particle sizes. These gold particles are difficult to be separated and recovered efficiently by gravity separation. After classification, different gravity separation methods are used for uranium-containing gold ores of different particle sizes to improve the recovery efficiency of gold particles. For the bound gold ore, water glass is used to inhibit gangue minerals, sodium hydrosulfide is used to activate gold-containing minerals, and a special amyl xanthate and alkyl aminocarboxylic acid combined collector is used. The gold grade in the total gold concentrate is 56.34g / t, and the recovery rate is 97.08%. The coarse-grained and fine-grained tailings after gold selection are combined, and the uranium-containing minerals are efficiently activated by using a combination of lead nitrate and ferric sulfate activators. The activated pitchblende, uranium stone and titanium uranium ore are floated out, and finally the titanium uranium minerals with weak magnetism are further recovered by strong magnetism, further improving the recovery rate of uranium. The uranium grade in the total uranium concentrate is 0.196%, and the recovery rate is 70.59%. This method realizes the comprehensive recovery of gold and uranium in uranium-containing gold ores, and the final tailings yield is as high as 87.06%. The gold and uranium residues in the tailings are low, with a gold grade of 0.14g / t and a uranium grade of 0.003%, which can meet the standards for radioactive exemption and can be directly discarded. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of the beneficiation process for uranium-containing gold ore. DETAILED DESCRIPTION

[0048] The following specific examples are intended to further illustrate the present invention rather than to limit the scope of protection of the claims.

[0049] Example 1

[0050] A uranium-gold ore is mainly composed of quartz, kaolinite, pyrite, feldspar, muscovite, chlorite and iron oxide / hydroxide, and other accessory minerals include zircon, titanite, chalcopyrite, galena, sphalerite, arsenopyrite, pyrite, chromite, ilmenite, rutile, monazite, apatite, gypsum and uranium minerals, etc. Gold mainly exists in the form of elemental gold, and uranium minerals mainly include pitchblende, uraninite and uraninite, with a gold grade of 4.37g / t and a uranium grade of 0.015%.

[0051] (1) The ores of groups A, B and C are all crushed to -8 mm in size, and then finely ground to -0.074 mm, accounting for 70%. Ore A is divided into two groups of -0.045 mm and +0.045 mm by a hydrocyclone. Ore B is divided into two groups of -0.025 mm and +0.025 mm. Ore C is divided into two groups of -0.015 mm and +0.015 mm.

[0052] (2) The +0.045 mm particle size ore, +0.025 mm particle size ore and +0.015 mm particle size ore in the three groups of ores A, B and C are separated by a shaking table to obtain gravity separation gold concentrate I and gravity separation gold tailings I respectively;

[0053] (3) The pulp concentration of the three groups of re-selected gold tailings I of A, B and C was adjusted to 25% of the mass fraction of the ore, and 800 g / t of water glass as a gangue mineral inhibitor was added respectively, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. 400 g / t of sodium hydrosulfide as an activator was added respectively, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. 200 g / t of amyl xanthate as a collector and 100 g / t of alkyl aminocarboxylic acid as a collector were added, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. 30 g / t of octanol as a foaming agent was added, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. After the minerals were fully contacted with the reagents, aeration was carried out for roughing to obtain roughing gold concentrate and roughing gold tailings;

[0054] (4) The -0.045 mm particle size ore, -0.025 mm particle size ore and -0.015 mm particle size ore of the three groups of ores A, B and C are re-selected by using a Nelson centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0055] (5) The rougher gold tailings and the re-selected gold tailings II obtained from the three groups of experiments A, B and C were respectively combined to obtain gold tailings. The pulp concentrations of the three groups of gold tailings were all adjusted to an ore mass fraction of 25%. Sulfuric acid was added to adjust the pH value, and the pulp pH value was adjusted to 4.0. Activators such as lead nitrate 600 g / t and iron sulfate 300 g / t were added, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. Collectors such as isooctyl phosphate 250 g / t and tetradecylamine 100 g / t were added, and the flotation machine was stirred at a speed of 1500 r / min for 10 min. After the ore and the reagent were fully contacted, aeration was carried out for roughing to obtain rougher uranium concentrate and rougher uranium tailings.

[0056] (6) Collectors of isooctyl phosphate 100 g / t and tetradecylamine 30 g / t were added to the rough uranium tailings obtained in the three tests A, B and C. The flotation machine was stirred at a speed of 1500 r / min for 10 min. After the minerals were fully contacted with the reagents, aeration was performed to obtain scavenged uranium concentrate and scavenged uranium tailings.

[0057] (7) The scavenged uranium tailings obtained in the three groups of experiments A, B, and C were subjected to magnetic separation using a high-intensity magnetic separator under a magnetic field strength of 1.2 T to recover weakly magnetic uranium minerals, thereby obtaining magnetically separated uranium concentrates and tailings.

[0058] The test results are shown in Table 1.

[0059] Table 1 Experimental results of Example 1

[0060]

[0061] It can be seen from Table 1 that when the grading particle size of the ore is 0.025 mm, the recovery effect of gold and uranium is the best, the recovery rate and grade of gold in the tailings are the lowest, and the recovery rate and grade of uranium are also the lowest.

[0062] Example 2

[0063] A uranium-gold ore from a foreign country is mainly composed of quartz, kaolinite, pyrite, feldspar, muscovite, chlorite and iron oxide / hydroxide, and other accessory minerals include zircon, titanite, chalcopyrite, galena, sphalerite, arsenopyrite, pyrite, chromite, ilmenite, rutile, monazite, apatite, gypsum and uranium minerals, etc. Gold mainly exists in the form of elemental gold, and uranium minerals mainly include pitchblende, uraninite and uraninite, with a gold grade of 4.37g / t and a uranium grade of 0.015%.

[0064] (1) The ores of groups A, B and C were crushed to -7 mm, and then finely ground to -0.074 mm, accounting for 80%. The ores were divided into two groups, -0.025 mm and +0.025 mm, by a hydrocyclone.

[0065] (2) The +0.025 mm particle size ores in the three groups of ores A, B, and C are separated by a shaking table to obtain a gravity-separated gold concentrate 1 and a gravity-separated gold tailings 1, respectively;

[0066] (3) The slurry concentration of the gold tailings 1 from the three groups of ores A, B, and C was adjusted to 20% of the mass fraction of the ore. 900 g / t of water glass, a gangue mineral inhibitor, was added to each group. The flotation machine was stirred at a speed of 2000 r / min for 10 min. 500 g / t of sodium hydrosulfide, an activator, was added to each group. The flotation machine was stirred at a speed of 2000 r / min for 10 min. 300 g / t of amyl xanthate, 150 g / t of alkylaminocarboxylic acid, and 100 g / t of alkylaminocarboxylic acid were added to each group. In the B group test, 0 g / t of amyl xanthate and 450 g / t of alkyl amino carboxylic acid were added as collectors, and 450 g / t of amyl xanthate and 0 g / t of alkyl amino carboxylic acid were added as collectors, and the flotation machine was stirred at a speed of 2000 r / min for 10 min. 45 g / t of octanol as a foaming agent was added to the flotation machine, and the flotation machine was stirred at a speed of 2000 r / min for 10 min. After the minerals were fully contacted with the reagents, aeration roughing was performed to obtain roughing gold concentrate I and roughing gold tailings I;

[0067] (4) The -0.025 mm particle size ores in the three groups A, B and C are re-selected using a Nelson centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0068] (5) The rougher gold tailings I and the re-selected gold tailings II obtained from the three groups of tests A, B and C were combined to obtain gold tailings. The pulp concentrations of the three groups of gold tailings were adjusted to 20% by mass fraction of ore. Sulfuric acid was added to adjust the pH value, and the pulp pH value was adjusted to 4.5. In the test of group A, 600 g / t of lead nitrate and 300 g / t of iron sulfate were added as activators. In the test of group B, 0 g / t of lead nitrate and 900 g / t of iron sulfate were added as activators. In the test of group C, 0 g / t of lead nitrate and 900 g / t of iron sulfate were added as activators. The flotation machine was stirred at a speed of 2000 r / min for 10 min. Collectors of isooctyl phosphate and tetradecylamine were added to the flotation machine. The flotation machine was stirred at a speed of 2000 r / min for 10 min. After the minerals were fully contacted with the reagents, aeration was performed for roughing to obtain rougher uranium concentrate II and rougher uranium tailings II.

[0069] (6) Collectors 90 g / t of isooctyl phosphate and 50 g / t of tetradecylamine were added to the rougher tailings 2 obtained in the three tests A, B and C. The flotation machine was stirred at a speed of 2000 r / min for 10 min. After the mineral and the reagent were fully contacted, aeration was performed to obtain scavenged uranium concentrate and scavenged uranium tailings.

[0070] (7) The scavenged uranium tailings obtained in the three groups of experiments A, B, and C were subjected to magnetic separation using a high-intensity magnetic separator under a magnetic field strength of 1.8 T to recover weakly magnetic uranium minerals, thereby obtaining magnetically separated uranium concentrates and tailings.

[0071] The test results are shown in Table 2.

[0072] Table 2 Experimental results of Example 2

[0073]

[0074] As shown in Table 2, when the collector of gold mineral is a mixture of amyl xanthate and alkyl aminocarboxylic acid, the flotation effect of gold is good, and the effect of using the two alone is poor; when the activator of uranium mineral is a mixture of lead nitrate and ferric sulfate, the activation effect of uranium mineral is the best, and the flotation effect of uranium is good, and the effect of using the two alone is poor.

[0075] Example 3

[0076] A uranium-gold ore from a foreign country is mainly composed of quartz, kaolinite, pyrite, feldspar, muscovite, chlorite and iron oxide / hydroxide, and other accessory minerals include zircon, titanite, chalcopyrite, galena, sphalerite, arsenopyrite, pyrite, chromite, ilmenite, rutile, monazite, apatite, gypsum and uranium minerals, etc. Gold mainly exists in the form of elemental gold, and uranium minerals mainly include pitchblende, uraninite and uraninite, with a gold grade of 4.37g / t and a uranium grade of 0.015%.

[0077] (1) The ores of groups A, B and C were crushed to -6 mm, and then finely ground to -0.074 mm, accounting for 90%. The ores were divided into two groups, -0.025 mm and +0.025 mm, by a hydrocyclone.

[0078] (2) The +0.025 mm particle size ores in the three groups of ores A, B, and C are separated by a shaking table to obtain gravity separation gold concentrate I and gravity separation gold tailings I, respectively;

[0079] (3) The slurry concentration of the re-selected gold tailings I in the three groups of ores A, B and C was adjusted to 35% of the mass fraction of the ore, and 1200 g / t of water glass as a gangue mineral inhibitor was added to each of them. The flotation machine was stirred at a speed of 2500 r / min for 3 min. 600 g / t of sodium hydrosulfide as an activator was added to each of them. The flotation machine was stirred at a speed of 2500 r / min for 5 min. 250 g / t of amyl xanthate as a collector and 200 g / t of alkyl aminocarboxylic acid as a frother were added to each of them. The flotation machine was stirred at a speed of 2500 r / min for 3 min. 60 g / t of sec-octanol as a frother was added to each of them. The flotation machine was stirred at a speed of 2500 r / min for 3 min. After the minerals were fully contacted with the reagents, they were aerated and roughly selected to obtain a rough gold concentrate and a rough gold tailing. The rough concentrate was finely selected twice without adding reagents. The fine tailings were returned to the previous flotation to obtain a flotation gold concentrate.

[0080] (4) The -0.025 mm particle size ores in the three groups A, B and C are re-selected using a Nelson centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0081] (5) The roughing gold tailings and re-selection gold tailings II obtained from the three groups of experiments A, B, and C were combined to obtain gold tailings. The pulp concentrations of the three groups of gold tailings were adjusted to 35% of the mass fraction of the ore. Sulfuric acid was added to adjust the pH value to 6.5. Activators such as lead nitrate 800 g / t and iron sulfate 400 g / t were added. The flotation machine was stirred at a speed of 2500 r / min for 3 min. In the experiment of group A, 250 g / t of isooctyl phosphate and 120 g / t of tetradecylamine were added as collectors. In the experiment of group B, 600 g / t of isooctyl phosphate and 0 g / t of tetradecylamine were added as collectors. In the experiment of group C, 0 g / t of isooctyl phosphate and 600 g / t of tetradecylamine were added as collectors. The flotation machine was stirred at a speed of 2500 r / min for 3 min. After the ore and the reagents were fully contacted, aeration was performed for roughing to obtain roughing uranium concentrate and roughing uranium tailings.

[0082] (6) In the rough uranium tailings obtained in the three groups of experiments A, B and C, 80 g / t of isooctyl phosphate and 40 g / t of tetradecylamine were added as collectors in the experiment A, 120 g / t of isooctyl phosphate and 0 g / t of tetradecylamine were added as collectors in the experiment B, and 0 g / t of isooctyl phosphate and 120 g / t of tetradecylamine were added as collectors in the experiment C. The flotation machine was stirred at a speed of 2500 r / min for 3 min, and the ore was fully contacted with the reagents and then aerated and scavenged to obtain scavenged uranium concentrate and scavenged uranium tailings;

[0083] (7) The rougher uranium concentrate and the scavenger uranium concentrate obtained in the three groups of tests A, B and C are combined, and the uranium concentrate is refined once, and the refined tailings are returned to the previous flotation to obtain a flotation uranium concentrate;

[0084] (8) The scavenged uranium tailings obtained in the three groups of experiments A, B, and C were subjected to magnetic separation using a high-intensity magnetic separator under a magnetic field strength of 2.0 T to recover weakly magnetic uranium minerals, thereby obtaining magnetically separated uranium concentrates and tailings.

[0085] The test results are shown in Table 3.

[0086] Table 3 Experimental results of Example 3

[0087]

[0088] It can be seen from Table 3 that when the collectors of uranium minerals, octyl phosphate, and tetraalkylamine are used in combination, the flotation effect of uranium is good, but the effect of using them alone is poor.

[0089] Example 4

[0090] A uranium-gold ore from a foreign country is mainly composed of quartz, kaolinite, pyrite, feldspar, muscovite, chlorite and iron oxide / hydroxide, and other accessory minerals include zircon, titanite, chalcopyrite, galena, sphalerite, arsenopyrite, pyrite, chromite, ilmenite, rutile, monazite, apatite, gypsum and uranium minerals, etc. Gold mainly exists in the form of elemental gold, and uranium minerals mainly include pitchblende, uraninite and uraninite, with a gold grade of 4.37g / t and a uranium grade of 0.015%.

[0091] (1) The ore particles are crushed to -5 mm, and then finely ground to -0.074 mm, accounting for 75%. The ore is divided into two groups: -0.025 mm particle size ore and +0.025 mm particle size ore by a hydrocyclone;

[0092] (2) Using a shaking table to separate the +0.025 mm particle size ore in the ore, and obtaining the gravity separation gold concentrate I and the gravity separation gold tailings I respectively;

[0093] (3) The slurry concentration of the re-selected gold tailings I is adjusted to 30% of the mass fraction of the ore, 800 g / t of water glass as a gangue mineral inhibitor is added, and the flotation machine is stirred at a speed of 2000 r / min for 5 min. 400 g / t of sodium hydrosulfide as an activator is added, and the flotation machine is stirred at a speed of 2000 r / min for 5 min. 300 g / t of amyl xanthate as a collector and 150 g / t of alkyl aminocarboxylic acid are added, and the flotation machine is stirred at a speed of 2000 r / min for 5 min. 45 g / t of 2-octanol as a frother is added, and the flotation machine is stirred at a speed of 2000 r / min for 5 min. After the mineral and the reagent are fully contacted, aeration roughing is performed to obtain a roughing gold concentrate and a roughing gold tailing. The roughing concentrate is finely selected twice without adding reagents, and the fine tailings are returned to the previous flotation to obtain a flotation gold concentrate.

[0094] (4) Re-selecting the -0.025 mm particle size ore using a Nelson centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II;

[0095] (5) The obtained rougher gold tailings and re-selected gold tailings II are respectively combined to obtain gold tailings, and the pulp concentration is adjusted to 30% of the ore mass fraction, and sulfuric acid is added to adjust the pH value, and the pulp pH value is adjusted to 5.5; activator lead nitrate 500g / t, iron sulfate 500g / t are added, and the flotation machine is stirred at a speed of 2000r / min for 5min, and collectors are added. Isooctyl phosphate 240g / t, tetradecylamine 120g / t, the flotation machine is stirred at a speed of 2000r / min for 5min, and the ore is fully contacted with the reagents and then aerated and roughly selected to obtain rougher uranium concentrate and rougher uranium tailings;

[0096] (6) Add 80 g / t of isooctyl phosphate and 30 g / t of tetradecylamine as collectors to the rough uranium tailings, stir the flotation machine at a speed of 2000 r / min for 5 min, and aerate and scavenge after the ore and the reagents are fully contacted to obtain scavenge uranium concentrate and scavenge uranium tailings;

[0097] (7) The rougher uranium concentrate and the scavenger uranium concentrate obtained in the test are combined, and the uranium concentrate is refined once, and the refined tailings are returned to the previous flotation to obtain a flotation uranium concentrate;

[0098] (8) The scavenged uranium tailings are subjected to magnetic separation using a high-intensity magnetic separator under a magnetic field strength of 1.8 T to recover weakly magnetic uranium minerals, thereby obtaining magnetically separated uranium concentrate and tailings.

[0099] The test results are shown in Table 4.

[0100] Table 4 Experimental results of Example 4

[0101] .

Claims

1. A method for beneficiating uranium-gold ore, characterized in that: The following steps are involved: 1) crushing, grinding and classifying the uranium-gold ore in sequence to obtain coarse-grained ore and fine-grained ore; the gold in the uranium-gold ore mainly exists in the form of elemental gold, and the uranium minerals mainly include pitchblende, uraninite and uraninite; 2) The coarse-grained ore is subjected to a shaking table gravity separation to obtain gravity separation gold concentrate I and gravity separation gold tailings I; 3) The gravity gold tailings I are slurried I and then enter flotation I, with water glass as a depressant, sodium hydrosulfide as an activator, amyl xanthate and alkyl aminocarboxylic acid as collectors, and a frother, and a roughing and multiple cleaning are performed to obtain a flotation gold concentrate; 4) The fine-grained ore is re-selected by a centrifugal concentrator to obtain re-selected gold concentrate II and re-selected gold tailings II; 5) The gold tailings obtained from the roughing and the gold tailings from the gravity separation II are combined and slurried in II, and then enter flotation II, using lead nitrate and ferric sulfate as activators, isooctyl phosphate and tetradecylamine as collectors, and performing one roughing, one scavenging and multiple cleaning to obtain a flotation uranium concentrate; 6) The uranium tailings obtained by scavenging are sent to magnetic separation to obtain magnetic uranium concentrate and magnetic tailings.

2. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The uranium-gold ore is ground to a particle size of -0.074 mm, and the mass percentage content is 65-95%.

3. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The classification adopts 0.025mm sieve.

4. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The slurry adjustment I adjusts the mass concentration of the slurry to 10-45%.

5. The beneficiation method of uranium-gold ore according to claim 1 or 4, characterized in that: The reagent system of the flotation I is: 100-1500 g / t of water glass, 100-800 g / t of sodium hydrosulfide, 50-500 g / t of amyl xanthate, 30-300 g / t of alkylaminocarboxylic acid, and 20-100 g / t of frother; the frother is 2-octanol.

6. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The slurry adjustment II adjusts the mass concentration of the slurry to 10-45% and the pH to 3-6.

5.

7. A method for beneficiating uranium-gold ore according to claim 1 or 6, characterized in that: The reagent system of the flotation II is: 100-1000 g / t of lead nitrate, 100-1000 g / t of ferric sulfate, 50-600 g / t of isooctyl phosphate, and 30-500 g / t of tetradecylamine.

8. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The reagent system for the scanning is: 20-200 g / t of isooctyl phosphate and 10-100 g / t of tetradecylamine.

9. The method for beneficiating uranium-gold ore according to claim 1, characterized in that: The magnetic field strength used in the magnetic separation is 0.8~2.0T.

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