Flotation separation method for copper-molybdenum ore

Abstract

This application provides a flotation separation method for copper-molybdenum ore. The method involves flotation of raw copper-molybdenum ore through a process of mixed copper-molybdenum flotation, copper-molybdenum separation, and copper beneficiation flotation to obtain copper concentrate and molybdenum concentrate. During the flotation process, a raw ore pulp with a concentration of 40-47% wt is prepared for mixed copper-molybdenum flotation, and a high-concentration mixed copper-molybdenum pulp with a concentration of 48-50% wt is prepared for copper-molybdenum separation flotation. In the flotation of the high-concentration pulp, the molybdenum ore flotation separation method provided in this application has the beneficial effects of reducing pulp volume, saving water, electricity, and reagent consumption in flotation, reducing beneficiation costs, increasing throughput per unit time, improving beneficiation efficiency, and saving beneficiation time.

Description

Technical Field

[0001] This application relates to the field of metal ore flotation technology, and in particular to a method for flotation separation of copper-molybdenum ore. Background Technology

[0002] Molybdenum is an important rare metal and strategic reserve resource, with an average content of only one part per hundred thousand in the Earth's crust. It possesses excellent properties, such as a high melting point, high temperature resistance, and good hot hardness, and is widely used in industries such as machinery manufacturing, metallurgy, electronics, shipbuilding, chemicals, and aerospace. Molybdenite is the primary source of molybdenum. Except for a very few deposits that exist as single deposits, most molybdenite is widely associated with sulfide minerals, especially copper sulfide minerals. It is estimated that nearly 75% of the world's copper and 50% of its molybdenum are produced from copper-molybdenum ores. Porphyry copper deposits are the main type of copper-molybdenum ore, with copper and molybdenum mainly existing as chalcopyrite and molybdenite. These ores are characterized by dense structure, fine grain size, and small difference in wettability and similar floatability between chalcopyrite and molybdenite, making separation difficult. Copper-molybdenum separation has become a major and challenging problem in mineral processing.

[0003] Copper and molybdenum ores are generally separated using flotation methods, mainly including three types: mixed flotation, preferential flotation, and equal-capacity flotation. Among these, mixed flotation is the most widely used process in industry because it is suitable for processing lean ores and can effectively improve the recovery rate of copper and molybdenum. This process mainly obtains copper and molybdenum concentrates through processes such as grinding the raw ore, classification, molybdenum flotation, and copper flotation. However, traditional beneficiation processes suffer from problems such as low concentration of overflow into the beneficiation pulp during classification, excessive frothing water during flotation, large pulp volume, and long process flow, making it difficult to further improve the recovery rate of molybdenum beneficiation and concentrate grade. Furthermore, these processes also suffer from high consumption of water, electricity, and reagents, poor operational stability, and high beneficiation costs. Summary of the Invention

[0004] This application provides a method for flotation separation of copper-molybdenum ore to solve the problems existing in the flotation separation of copper-molybdenum ore in the prior art.

[0005] This application provides a method for flotation separation of copper-molybdenum ore, comprising the following steps:

[0006] a) After crushing the copper-molybdenum ore, it is ball-milled to a fineness of ~0.074mm, accounting for 45-50%. Alkali is added to adjust the pH to 7.8-8.5 to obtain a raw ore slurry with a concentration of 40-47%wt.

[0007] b) Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and use a mixed flotation process with one roughing, one cleaning and three scavenging ore sequential return to obtain a copper-molybdenum mixed concentrate by mixed roughing.

[0008] c) After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 80-90%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0009] d) Add inhibitors to the copper-molybdenum mixed slurry and use a flotation process with two cleaning and three scavenging stages and sequential return of ore to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore;

[0010] e) Prepare a crude copper slurry with a concentration of 10-15% by adding a collector for copper beneficiation. Use a flotation process of roughing, cleaning, scavenging, and ore return in sequence to obtain copper concentrate.

[0011] The copper-molybdenum ore flotation separation method provided in this application obtains copper concentrate and molybdenum concentrate from raw copper-molybdenum ore through a process of copper-molybdenum mixed flotation, copper-molybdenum separation, and copper beneficiation flotation. During the flotation process, a raw ore pulp with a concentration of 40-47% wt is prepared for copper-molybdenum mixed flotation, and a high-concentration copper-molybdenum mixed pulp with a concentration of 48-50% wt is prepared for copper-molybdenum separation flotation. Using the molybdenum ore flotation separation method provided in this application in the flotation of the aforementioned high-concentration pulp has the following beneficial effects:

[0012] 1) Using high-concentration slurry in mixed flotation and copper-molybdenum separation flotation can effectively reduce the volume of slurry, save water, electricity and reagent consumption in flotation, and reduce mineral processing costs.

[0013] 2) Under high-concentration beneficiation conditions, the grade and recovery rate of copper and molybdenum concentrates can be improved.

[0014] 3) Under high-concentration beneficiation conditions, the beneficiation process can be effectively shortened, the throughput per unit time can be increased, the beneficiation efficiency can be improved, and the beneficiation time can be saved.

[0015] 4) Under high-concentration beneficiation conditions, the pulp concentration fluctuates little, which has little impact on the stability of the flotation operation and is conducive to the stable progress of the flotation process.

[0016] Optionally, for step b):

[0017] During the roughing process, the dosage of No. 2 oil is 20-22 g / t, the dosage of diesel is 22-25 g / t, and the dosage of ethyl thiocyanate is 3.2-3.7 g / t.

[0018] During the first scavenging process, the dosage of No. 2 oil was 1.5-1.7 g / t, the dosage of diesel oil was 7-7.3 g / t, and the dosage of ethyl thiocyanate was 1-1.2 g / t.

[0019] During the second scavenging process, the dosage of No. 2 oil was 1.5–1.7 g / t, the dosage of diesel oil was 9–9.8 g / t, and the dosage of ethyl thiocyanate was 1.2–1.6 g / t.

[0020] During the third scavenging process, the dosage of No. 2 oil was 1.5–1.7 g / t, the dosage of diesel oil was 9–9.8 g / t, and the dosage of ethyl thiocyanate was 1.2–1.6 g / t.

[0021] Optionally, for step d):

[0022] Inhibitors were added during the first and second selection processes, with the amount of inhibitor used in each selection being 240–300 g / t; the inhibitors included sodium thioglycolate.

[0023] Optionally, for step e):

[0024] The amount of collector used in the roughing process is 800-850 g / t; the collector includes xanthate.

[0025] Optionally, in step b), the middlings obtained during the first scavenging process are floated using a flotation machine and then returned to the cleaning process.

[0026] Optionally, the copper-molybdenum mixed slurry undergoes a passivation operation before step d), which includes:

[0027] Air is introduced into the copper-molybdenum mixed slurry for aeration, with an aeration rate of 400–460 m³ / min. 3 / h, aeration time is 6-8h.

[0028] Optionally, in step d), an inert gas is introduced for flotation during the copper-molybdenum separation process.

[0029] Optionally, the alkali is lime milk or sodium hydroxide.

[0030] Optionally, in step d), the first selection, the second selection, and the first sweep are performed using a flotation column.

[0031] Alternatively, the inert gas may include nitrogen or argon. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a closed-circuit process flow diagram for copper-molybdenum ore flotation separation provided in an embodiment of this application. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0035] like Figure 1 As shown, this application provides a method for flotation separation of copper-molybdenum ore, comprising the following steps:

[0036] a) After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074 mm, accounting for 45-50%. Alkali is added to adjust the pH to 7.8-8.5 to obtain a raw ore slurry with a concentration of 40-47%wt.

[0037] In this application, the raw ore crushing process involves first coarsely crushing the raw ore with a particle size of less than 950mm to a particle size of less than 300mm, then performing medium crushing, and the raw ore with a particle size of less than 100mm after medium crushing, followed by fine crushing, screening, and high-pressure roller crushing, and finally using the raw ore with a particle size of less than 6mm obtained after screening as the raw material for ball milling.

[0038] In this application, during the ball milling process, the filling rate is 40-45%, the grinding concentration is 70-75%wt, and the ball milling speed is 17-18r / min.

[0039] The concentration of the raw ore slurry in this application is 40-47% wt. The concentration of the raw ore slurry in this application is a relatively high concentration. Using a high concentration raw ore slurry can effectively reduce the volume of slurry and save water.

[0040] Optionally, the alkali is lime milk or sodium hydroxide.

[0041] Adding alkali to adjust the pH can cause free metal ions in the raw ore to form hydroxide precipitates, while alkaline conditions can prevent the collector from decomposing.

[0042] b) Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and use a mixed flotation process with one roughing, one cleaning and three scavenging ore sequential return to obtain a mixed copper-molybdenum concentrate by mixed roughing.

[0043] In this application, No. 2 oil (i.e., pine oil) is used as a foaming agent, and diesel oil and ethyl thiocyanate are used as collectors. Through mixed roughing, copper-molybdenum mixed concentrate can be obtained by flotation.

[0044] In step b), a mixed flotation process with one rougher, one cleaner, and three scavengers followed by sequential return of middlings is adopted. Specifically, after roughing, crude copper-molybdenum mixed concentrate and middlings from the rougher are obtained. The crude copper-molybdenum mixed concentrate undergoes another cleaner stage, while the middlings from the rougher undergo three scavengers. The middlings from each scavenger stage are sequentially returned to the previous flotation stage, while the tailings are centrally processed. The crude copper-molybdenum mixed concentrate undergoes one cleaner stage to obtain copper-molybdenum mixed concentrate and cleaned middlings, which are then returned to the previous flotation stage. Ethiocyanate is dissolved in diesel fuel and added during use.

[0045] The above-mentioned mixed flotation process, which involves roughing, cleaning, scavenging, and sequential return of middlings, can effectively separate copper-molybdenum mixed concentrate from middlings, thereby improving the recovery rate of copper-molybdenum mixed concentrate.

[0046] c) After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 80-90%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0047] In this application, secondary ball milling serves two purposes: firstly, it removes the collector from the surface of the copper-molybdenum mixed concentrate; secondly, it yields finer mineral particles, which helps reduce the co-occurrence of copper and molybdenum. Secondary ball milling facilitates the subsequent binding of inhibitors with the copper ore, thereby achieving a better effect of suppressing copper and floating molybdenum. The concentration of the copper-molybdenum mixed slurry is 48–50% wt, which effectively reduces water consumption compared to the traditional low-concentration slurry of 30–40% wt.

[0048] d) Add inhibitors to the copper-molybdenum mixed slurry and use a flotation process with two cleaning and three scavenging stages followed by ore return to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore.

[0049] In this application, the copper-molybdenum separation process adopts a method of inhibiting copper and floating molybdenum. The inhibitors are inorganic inhibitors such as NaCN and [Na4Fe(CN)6], NaS, Knox reagent, sodium thiosulfate, sodium sulfite, etc., or organic inhibitors such as mercaptoacetic acid, thiourea, xanthic acid, etc., or a combination of inorganic inhibitors and organic inhibitors. The inhibitors can bind to the surface of copper ore, thereby increasing the hydrophilicity of copper ore and preventing copper ore from floating, thus achieving the purpose of inhibiting copper.

[0050] In this application, the copper-molybdenum separation flotation process with a two-stage cleaning, three-stage scavenging, and sequential return of middlings is as follows: A copper-molybdenum mixed slurry with added depressants undergoes a first cleaning to obtain crude molybdenum concentrate and middlings from the first cleaning. The crude molybdenum concentrate undergoes a second cleaning to obtain molybdenum concentrate, and the middlings from the second cleaning are returned to the next flotation stage. The middlings from the first cleaning undergo three scavenging processes to obtain copper concentrate, and the middlings from each scavenging are sequentially returned to the next flotation stage.

[0051] In this application, a copper-molybdenum separation flotation process with two cleaning and three scavenging stages and sequential return of ore is adopted. This process has a short molybdenum beneficiation process, minimal molybdenum ore loss, and the short process also reduces the consumption of manpower and material resources.

[0052] e) Prepare a crude copper slurry with a concentration of 10-15% by adding a collector for copper beneficiation. Use a flotation process of roughing, cleaning, scavenging, and ore return in sequence to obtain copper concentrate.

[0053] In this application, a collector is added during the copper beneficiation process. Collectors such as xanthate, black powder, ethyl thiocyanate, PAC and chelating collectors are used. The ore-loving group in the collector combines with the copper ore surface, so that the collector adheres to the copper ore surface. The hydrophobic group makes the copper ore hydrophobic and easy to float, thereby achieving the collection of copper ore.

[0054] In this application, crude copper ore is roughed once to obtain crude copper concentrate and middlings. The crude copper concentrate is then cleaned twice to obtain copper concentrate. The middlings obtained in each cleaning process are returned to the next flotation stage. The tailings obtained from the middlings after two scavenging processes are combined with the tailings obtained in step b) for centralized processing. The middlings obtained in each scavenging process are returned to the next flotation stage.

[0055] Optionally, for step b):

[0056] During the roughing process, the dosage of No. 2 oil is 20-22 g / t, the dosage of diesel is 22-25 g / t, and the dosage of ethyl thiocyanate is 3.2-3.7 g / t.

[0057] During the first scavenging process, the dosage of No. 2 oil was 1.5-1.7 g / t, the dosage of diesel oil was 7-7.3 g / t, and the dosage of ethyl thiocyanate was 1-1.2 g / t.

[0058] During the second scavenging process, the dosage of No. 2 oil was 1.5–1.7 g / t, the dosage of diesel oil was 9–9.8 g / t, and the dosage of ethyl thiocyanate was 1.2–1.6 g / t.

[0059] During the third scavenging process, the dosage of No. 2 oil was 1.5–1.7 g / t, the dosage of diesel oil was 9–9.8 g / t, and the dosage of ethyl thiocyanate was 1.2–1.6 g / t.

[0060] In this application, No. 2 oil, diesel oil and ethyl thiocyanate are added during the roughing and three-stage scavenging processes, which can effectively separate copper-molybdenum mixed concentrate from the raw ore.

[0061] Optionally, for step d): an inhibitor is added during the first and second selection processes, with the amount of inhibitor used in each selection being 240-300 g / t; the inhibitor includes sodium thioglycolate.

[0062] This application uses sodium thioglycolate as an inhibitor, which has the advantages of low dosage, good inhibitory effect, low pollution, and selectivity.

[0063] Optionally, for step e): the amount of collector used in the roughing process is 800-850 g / t; the collector includes xanthate.

[0064] In this application, xanthate is also known as xanthate. Sodium xanthate, also known as sodium xanthate, is used in this application. It has the characteristics of being easy to manufacture, inexpensive and easy to store. During flotation, lime milk can be used to adjust the pulp to alkalinity, such as pH=9-11, in order to avoid the decomposition of xanthate.

[0065] Optionally, in step b), the middlings obtained during the first scavenging process are floated using a flotation machine and then returned to the cleaning process.

[0066] In this application, the middlings obtained in the first scavenging process have relatively high copper and molybdenum contents. Therefore, returning them to the refining process after a flotation can reduce the waste of mineral resources and improve the recovery rate of copper and molybdenum.

[0067] Optionally, the copper-molybdenum mixed slurry undergoes a passivation operation before step d), which includes:

[0068] Air is introduced into the copper-molybdenum mixed slurry for aeration, with an aeration rate of 400–460 m³ / min. 3 / h, aeration time is 6-8h.

[0069] In this application, since copper-molybdenum ore is basically a symbiotic mineral of molybdenite and chalcopyrite or chalcocite, air is used to aerate the copper-molybdenum mixed slurry. During the aeration process, the surface of the copper ore can be oxidized while the molybdenum ore is almost unaffected, thereby increasing the hydrophilicity of the copper ore and achieving a better copper suppression effect.

[0070] Optionally, in step d), an inert gas is introduced for flotation during the copper-molybdenum separation process.

[0071] Alternatively, the inert gas may include nitrogen or argon.

[0072] In this application, the introduction of an inert gas prevents the sodium mercaptoacetate added during the copper-molybdenum separation flotation process from being oxidized, thus affecting the inhibition effect. Nitrogen or argon can be used as the inert gas.

[0073] In one feasible method, ferrous sulfate is added during the copper-molybdenum separation process. The amount of ferrous sulfate added is 35-42 g / t (prepared as a solution before use). To prevent the ferrous sulfate from being oxidized, it can be added after an inert gas has been introduced for a period of time, for example, at 1 / 4 to 1 / 3 of the single flotation time. Ferrous sulfate is added because it can hydrolyze in aqueous solution to form ferrous hydroxide colloid with a flocculating effect. Ferrous hydroxide can then combine with the inhibitor on the copper ore surface (because the inhibitor used in this application is sodium thioacetate; when sodium thioacetate exerts its inhibitory effect, the thiol groups combine with the copper ore surface, and the hydrophilic acetate ions associate with water molecules to increase the hydrophilicity of the copper ore, thus exerting a copper-inhibiting effect), thereby achieving a flocculation effect.

[0074] Adding ferrous sulfate during flotation can work synergistically with inhibitors (copper ore with added sodium thioacetate has slightly electronegative carboxyl groups on its surface, making it easier for ferrous hydroxide to colloidally bind and flocculate, thus achieving a synergistic effect) to inhibit copper ore and improve the separation of copper and molybdenum. To ensure better results from ferrous sulfate, the pH of the flotation pulp should be adjusted to between 8.7 and 9.3.

[0075] Optionally, in step d), the first selection, the second selection, and the first sweep are performed using a flotation column.

[0076] In this application, flotation column flotation is adopted, which has the advantages of simple structure, small footprint; no mechanical moving parts, safety and energy saving; stable flotation dynamics, relatively small and uniformly distributed bubbles, sufficient bubble-particle flotation interface, large enrichment ratio, high recovery rate, suitable for the separation of fine-grained minerals and easy to realize automated control and large-scale; fast flotation speed, which can simplify the flotation process and effectively reduce the number of flotation operations.

[0077] Example 1

[0078] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0079] S101. After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074mm, accounting for 45-50%. Lime milk is added to adjust the pH to 8.0 to obtain a raw ore slurry with a concentration of 45%wt.

[0080] S102. Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and adopt a mixed flotation process with one roughing, one cleaning and three scavenging middlings sequentially returned to the cleaning process to obtain a mixed copper-molybdenum concentrate; the middlings obtained in the first scavenging process are floated by a flotation machine and then returned to the cleaning process.

[0081] During the roughing process, the dosage of No. 2 oil was 20.31 g / t, the dosage of diesel oil was 23.80 g / t, and the dosage of ethyl thiocyanate was 3.57 g / t.

[0082] During the first scavenging process, the dosage of No. 2 oil was 1.56 g / t, the dosage of diesel oil was 7.14 g / t, and the dosage of ethyl thiocyanate was 1.07 g / t.

[0083] During the second scavenging process, the dosage of No. 2 oil was 1.56 g / t, the dosage of diesel oil was 9.53 g / t, and the dosage of ethyl thiocyanate was 1.42 g / t.

[0084] During the third scavenging process, the dosage of No. 2 oil was 1.56 g / t, the dosage of diesel oil was 9.53 g / t, and the dosage of ethyl thiocyanate was 1.42 g / t.

[0085] S103. After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 85%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0086] S104. A flotation process with two cleaning and three scavenging stages and sequential return of ore is adopted to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore. Sodium mercaptoacetate is added during the first and second cleaning processes, with a dosage of 250 g / t in each cleaning process.

[0087] S105. Prepare a crude copper slurry with a concentration of 10-15% by preparing the crude copper ore, adjust the pH to 9, and adopt a flotation process of one roughing, two cleaning, and two scavenging with sequential return of the ore to obtain copper concentrate; the amount of sodium xanthate used in the roughing process is 833 g / t.

[0088] Example 2

[0089] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0090] S201. After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074mm, accounting for 45-50%. Lime milk is added to adjust the pH to 7.8 to obtain a raw ore slurry with a concentration of 40%wt.

[0091] S202. Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and adopt a mixed flotation process with one roughing, one cleaning and three scavenging middlings sequentially returned to the cleaning process to obtain a mixed copper-molybdenum concentrate; the middlings obtained in the first scavenging process are floated by a flotation machine and then returned to the cleaning process.

[0092] During the roughing process, the dosage of No. 2 oil is 20g / t, the dosage of diesel is 22g / t, and the dosage of ethyl thiocyanate is 3.2g / t.

[0093] During the first scavenging process, the dosage of No. 2 oil was 1.7 g / t, the dosage of diesel oil was 7 g / t, and the dosage of ethyl thiocyanate was 1 g / t.

[0094] During the second scavenging process, the dosage of No. 2 oil was 1.5 g / t, the dosage of diesel oil was 9 g / t, and the dosage of ethyl thiocyanate was 1.2 g / t.

[0095] During the third scavenging process, the dosage of No. 2 oil was 1.5 g / t, the dosage of diesel oil was 9 g / t, and the dosage of ethyl thiocyanate was 1.2 g / t.

[0096] S203. After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 80%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0097] S204. A flotation process with two cleaning and three scavenging stages and sequential return of ore is adopted to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore. Sodium mercaptoacetate is added during the first and second cleaning processes, with a dosage of 240 g / t in each cleaning process.

[0098] S205. Prepare a crude copper slurry with a concentration of 10-15% by preparing the crude copper ore, adjust the pH to 11, and adopt a flotation process of one roughing, two cleaning, and two scavenging with sequential return of the ore to obtain copper concentrate; the amount of collector used in the roughing process is 800g / t.

[0099] Example 3

[0100] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0101] S301. After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074mm, accounting for 45-50%. Lime milk is added to adjust the pH to 7.8-8.5 to obtain a raw ore slurry with a concentration of 47%wt.

[0102] S302. Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and adopt a mixed flotation process with one roughing, one cleaning and three scavenging middlings sequentially returned to the cleaning process to obtain a mixed copper-molybdenum concentrate; the middlings obtained in the first scavenging process are floated by a flotation machine and then returned to the cleaning process.

[0103] During the roughing process, the dosage of No. 2 oil is 22g / t, the dosage of diesel is 25g / t, and the dosage of ethyl thiocyanate is 3.7g / t.

[0104] During the first scavenging process, the dosage of No. 2 oil was 1.5 g / t, the dosage of diesel oil was 7.3 g / t, and the dosage of ethyl thiocyanate was 1.2 g / t.

[0105] During the second scavenging process, the dosage of No. 2 oil was 1.7 g / t, the dosage of diesel oil was 9.8 g / t, and the dosage of ethyl thiocyanate was 1.6 g / t.

[0106] During the third scavenging process, the dosage of No. 2 oil was 1.7 g / t, the dosage of diesel oil was 9.8 g / t, and the dosage of ethyl thiocyanate was 1.6 g / t.

[0107] S303. After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 90%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0108] S304. A flotation process with two cleaning and three scavenging stages and sequential return of ore is adopted to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore. Sodium mercaptoacetate is added during the first and second cleaning processes, with a dosage of 300 g / t in each cleaning process.

[0109] S305. Prepare a crude copper slurry with a concentration of 10-15% by preparing the crude copper ore, adjust the pH to 10, and adopt a flotation process of one roughing, two cleaning, and two scavenging with sequential return of the ore to obtain copper concentrate; the amount of collector used in the roughing process is 850g / t.

[0110] Example 4

[0111] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0112] S401. After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074mm, accounting for 45-50%. Lime milk is added to adjust the pH to 7.8-8.5 to obtain a raw ore slurry with a concentration of 42%wt.

[0113] S402. Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and use a mixed flotation process with one roughing, one cleaning and three scavenging middlings sequentially returned to the cleaning process to obtain a copper-molybdenum mixed concentrate; the middlings obtained in the first scavenging process are floated by a flotation machine and then returned to the cleaning process.

[0114] During the roughing process, the dosage of No. 2 oil was 21.8 g / t, the dosage of diesel oil was 23.6 g / t, and the dosage of ethyl thiocyanate was 3.43 g / t.

[0115] During the first scavenging process, the dosage of No. 2 oil was 1.65 g / t, the dosage of diesel oil was 7.15 g / t, and the dosage of ethyl thiocyanate was 1.15 g / t.

[0116] During the second scavenging process, the dosage of No. 2 oil was 1.61 g / t, the dosage of diesel oil was 9.52 g / t, and the dosage of ethyl thiocyanate was 1.43 g / t.

[0117] During the third scavenging process, the dosage of No. 2 oil was 1.61 g / t, the dosage of diesel oil was 9.52 g / t, and the dosage of ethyl thiocyanate was 1.43 g / t.

[0118] S403. After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 87%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt.

[0119] S404. A flotation process with two cleaning and three scavenging stages and sequential return of ore is adopted to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore. Sodium mercaptoacetate is added during the first and second cleaning processes, with a dosage of 270 g / t in each cleaning process.

[0120] S405. Prepare a crude copper slurry with a concentration of 10-15% by preparing the crude copper ore, adjust the pH to 9.5, and use a flotation process of roughing, cleaning, scavenging and ore return in sequence to obtain copper concentrate; the amount of collector used in the roughing process is 825g / t.

[0121] Example 5

[0122] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0123] The remaining process is exactly the same as in Example 1, except that a passivation operation is performed before step S104. The passivation operation includes: aerating the copper-molybdenum mixed slurry by introducing air at a rate of 460 m³ / min. 3 / h, aeration time is 8h.

[0124] Example 6

[0125] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0126] The rest of the process is exactly the same as in Example 1, except that in step S104, during the copper-molybdenum separation process, an inert gas is introduced for flotation.

[0127] Example 7

[0128] A method for separating copper-molybdenum ore by flotation is as follows: the rest of the process is completely consistent with Example 1, except that nitrogen gas is introduced for flotation during the copper-molybdenum separation process in step S104, and 40 g / t of ferrous sulfate is added when the inert gas is introduced for 1 / 3 of the time of the first and second cleaning processes.

[0129] Example 8

[0130] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0131] The rest of the process is exactly the same as in Example 1, except that:

[0132] Prior to step S104, a passivation operation is performed, which includes: aerating the copper-molybdenum mixed slurry by introducing air at a rate of 460 m³ / min. 3 / h, aeration time is 8h.

[0133] In step S104, nitrogen gas is introduced for flotation during the copper-molybdenum separation process.

[0134] Example 9

[0135] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0136] The rest of the process is exactly the same as in Example 1, except that:

[0137] Prior to step S104, a passivation operation is performed, which includes: aerating the copper-molybdenum mixed slurry by introducing air at a rate of 460 m³ / min. 3 / h, aeration time is 8h.

[0138] In step S104, during the copper-molybdenum separation process, nitrogen gas is introduced for flotation. During the first and second cleaning processes, 40 g / t of ferrous sulfate is added when the inert gas is introduced for 1 / 3 of the cleaning time.

[0139] Comparative Example 1

[0140] A flotation separation method for copper-molybdenum ore, the operation of which is as follows:

[0141] The rest of the process is exactly the same as in Example 1, except that the concentration of the raw ore slurry is 35% wt and the concentration of the copper-molybdenum mixed ore slurry is 35-40%.

[0142] Experimental Example 1

[0143] Experimental Method: The raw material was a copper-molybdenum mixed ore with a copper grade of 0.53% and a molybdenum grade of 0.012%. Copper was mainly distributed in chalcopyrite, and molybdenum was mainly distributed in molybdenite. The methods described in Examples 1 to 7 of this application and Comparative Example 1 were used for flotation separation. The grades of copper and molybdenum in the flotation concentrate and their recoveries were determined. The results are shown in Table 1.

[0144]

[0145]

[0146] As can be seen from the data in Examples 1-4 and Comparative Example 1 in Table 1, the method of this application significantly reduces the copper-molybdenum intermingling content in the copper and molybdenum concentrates during copper-molybdenum ore flotation, and the recovery rate of copper and molybdenum concentrates is relatively high. This indicates that the method of this application is an improvement over traditional methods for screening mixed copper-molybdenum concentrates. A comparison of the data in Examples 1-4 and Examples 5-9 in Table 1 shows that aeration passivation of the mixed copper-molybdenum concentrate before copper-molybdenum separation flotation, the use of inert gas for copper-molybdenum separation flotation, and the addition of ferrous sulfate also have a good effect on improving the separation degree of copper-molybdenum concentrates. The data in Example 9 shows that aeration passivation of the mixed copper-molybdenum concentrate before copper-molybdenum separation flotation, the addition of ferrous sulfate during copper-molybdenum separation flotation, and the simultaneous use of inert gas flotation have a significant effect on reducing the copper-molybdenum intermingling content in the copper and molybdenum concentrates and improving the recovery rate of copper and molybdenum.

[0147] It should be noted that, unless otherwise specified, concentrations, ratios, etc. in this application refer to weight concentrations, weight ratios, etc., which are common writing conventions for those skilled in the art, and therefore will not be elaborated upon in this application.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for flotation separation of copper-molybdenum ore, characterized in that, Includes the following steps: a) After crushing the copper-molybdenum ore, ball milling is performed to achieve a grinding fineness of ~0.074mm, accounting for 45~50%. Alkali is added to adjust the pH to 7.8~8.5 to obtain a raw ore slurry with a concentration of 40~47%wt. b) Add No. 2 oil, diesel oil and ethyl thiocyanate to the raw ore slurry, and use a mixed flotation process with one roughing, one cleaning and three scavenging ore sequential return to the mixed roughing to obtain a copper-molybdenum mixed concentrate; c) After screening, the copper-molybdenum mixed concentrate is ball-milled again to a fineness of ~0.043mm, accounting for 80-90%, and prepared into a copper-molybdenum mixed slurry with a concentration of 48-50%wt. d) Add inhibitors to the copper-molybdenum mixed slurry and use a flotation process with two cleaning and three scavenging stages and sequential return of ore to separate copper and molybdenum to obtain molybdenum concentrate and crude copper ore; e) Prepare a crude copper slurry with a concentration of 10-15% by adding a collector for copper beneficiation. Use a flotation process of roughing, cleaning, scavenging and ore return in sequence to obtain copper concentrate. The copper-molybdenum mixed slurry undergoes a passivation operation before step d), which includes: Air is introduced into the copper-molybdenum mixed slurry for aeration, with an aeration rate of 400-460 m³ / h. 3 / h, aeration time 6~8h; Step d) During the copper-molybdenum separation process, inert gas is introduced for flotation; ferrous sulfate is also added during the copper-molybdenum separation process, with an addition amount of 35~42g / t, and the addition time of ferrous sulfate is 1 / 4~1 / 3 of the single flotation time, and the pH of the pulp is 8.7~9.

3. For step d): Inhibitors are added during the first and second selection processes, with the amount of inhibitor used in each selection being 240~300g / t; the inhibitor includes sodium thioglycolate.

2. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, For step b): During the roughing process, the dosage of No. 2 oil is 20~22g / t, the dosage of diesel is 22~25g / t, and the dosage of ethyl thiocyanate is 3.2~3.7g / t. During the first scavenging process, the dosage of No. 2 oil was 1.5~1.7g / t, the dosage of diesel oil was 7~7.3g / t, and the dosage of ethyl thiocyanate was 1~1.2g / t. During the second scavenging process, the dosage of No. 2 oil is 1.5~1.7g / t, the dosage of diesel is 9~9.8g / t, and the dosage of ethyl thiocyanate is 1.2~1.6g / t. During the third scavenging process, the dosage of No. 2 oil was 1.5~1.7g / t, the dosage of diesel oil was 9~9.8g / t, and the dosage of ethyl thiocyanate was 1.2~1.6g / t.

3. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, For step e): The amount of collector used in the roughing process is 800~850g / t; the collector includes xanthate.

4. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, In step b), the middlings obtained during the first scavenging process are floated by a flotation machine and then returned to the cleaning process.

5. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, The alkali is lime milk or sodium hydroxide.

6. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, In step d), the first selection, the second selection, and the first sweep are performed using a flotation column.

7. The method for flotation separation of copper-molybdenum ore according to claim 1, characterized in that, The inert gas includes nitrogen or argon.

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