CN110339945B - Flotation separation method of copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles - Google Patents
Flotation separation method of copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles Download PDFInfo
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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Abstract
The invention discloses a flotation separation method of copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles, which comprises the following steps: mixing the micro-fine particle copper-molybdenum bulk concentrate containing hydrophobic gangue; carrying out copper-molybdenum pre-separation roughing on the ore pulp to obtain molybdenum rough concentrate with high copper content and roughing tailings 1; grinding the molybdenum rough concentrate; carrying out copper-molybdenum intensified separation flotation on the ground ore pulp to obtain copper-molybdenum intensified separation flotation molybdenum rough concentrate and intensified separation rough tailings 2; combining the rougher tailings 1 and 2, and then carrying out copper-molybdenum separation scavenging to obtain scavenged concentrate and copper concentrate, wherein the scavenged concentrate is returned to the copper-molybdenum pre-separation rougher; and carrying out five times of concentration on the copper-molybdenum reinforced separation flotation molybdenum rough concentrate to obtain molybdenum concentrate and five molybdenum concentration middlings, returning the first concentration middlings to the copper-molybdenum pre-separation rough concentration operation, and then sequentially returning the four times of concentration middlings to the previous layer operation respectively. The invention has the advantages of high efficiency, stability, energy saving, environmental protection, economy, strong adaptability and good sorting index.
Description
Technical Field
The invention belongs to the technical field of mineral processing engineering, relates to a flotation separation method of copper-molybdenum bulk concentrates, and particularly relates to a flotation separation method of copper-molybdenum bulk concentrates containing hydrophobic gangue micro-fine particles.
Background
Molybdenum is an important rare metal and is mainly extracted from molybdenite. Currently, the molybdenum-containing ore which is proved in China mainly comprises porphyry type copper-molybdenum ore deposits and skarn type copper-molybdenum ore deposits, wherein the porphyry type copper-molybdenum ore deposits are abundant, the reserves are large, and the associated molybdenum grade is low. For the copper-molybdenum symbiotic ore, a copper-molybdenum mixed concentrate is mostly obtained at home and abroad by adopting a copper-molybdenum mixed flotation process, and then the copper-molybdenum mixed concentrate and the copper concentrate are finally obtained by treating the copper-molybdenum mixed concentrate through a method for inhibiting copper from floating molybdenum.
However, in the existing copper-molybdenum separation and mineral separation technologies, it is usually necessary to first perform pretreatment on copper-molybdenum bulk concentrates by means of concentration, reagent removal, heating, ore grinding and the like, then select a copper inhibitor to strongly inhibit copper minerals, and use kerosene as a molybdenite collecting agent to perform multiple concentration to realize copper-molybdenum separation, wherein the commonly used copper mineral inhibitors include sodium hydrosulfide, sodium sulfide, dichromate, sodium cyanide, sodium thioglycolate, lime, peroxide, nocks reagent and the like. The sorting process has a plurality of problems, such as large consumption of sodium sulfide and sodium hydrosulfide which are commonly used, 30-50 kg/t of sodium sulfide and sodium hydrosulfide in production, and extremely high medicament cost; sodium cyanide, dichromate, sodium thioglycollate and the like have extremely adverse effects on the environment, and have deviation in the inhibiting effect on the fine-grained embedded copper minerals; the copper and molybdenum separation effect is poor, the molybdenum concentrate quality is low, the copper content is higher, and the recovery rate is not ideal.
For most of the copper-molybdenum bulk concentrates difficult to separate, the problems that copper-molybdenum minerals are closely intergrown, the embedded granularity is too fine, the content of intergrowth of the copper-molybdenum minerals and silicate gangue minerals is high, the content of mica hydrophobic gangue is high and the like exist. In the separation process, factors such as ore argillization, easy pumice interference, fine granularity of useful minerals and the like further aggravate the difficulty of copper and molybdenum separation, and higher requirements are put forward for the separation process, so that part of molybdenum-containing copper mine concentrating mills in China cannot separate qualified molybdenum concentrate from copper concentrate, and the waste of molybdenum metal resources is caused. Therefore, the invention provides an efficient, energy-saving, green and clean copper-molybdenum separation process aiming at the copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles and difficult to treat, and has great significance for realizing comprehensive recovery of valuable metal elements in associated copper-molybdenum ores.
Disclosure of Invention
The invention provides a flotation separation method for copper-molybdenum bulk concentrates containing hydrophobic gangue fine particles, which aims at solving the problems of high separation difficulty, low separation efficiency, high copper-molybdenum content, unqualified molybdenum concentrate grade, high separation cost and energy consumption, difficulty in control of a flotation process and the like of the copper-molybdenum bulk concentrates containing the hydrophobic gangue fine particles by adopting a traditional separation process. The method has the advantages of high efficiency, stability, energy conservation, environmental protection, economy, strong adaptability and good sorting index, and enables valuable metal molybdenum in the copper-molybdenum bulk concentrates to be efficiently and comprehensively recycled.
The purpose of the invention is realized by the following technical scheme:
a flotation separation method of copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles comprises the following steps:
(1) sample preparation and size mixing: adjusting the mass concentration of the prepared micro-fine particle copper-molybdenum bulk concentrate containing hydrophobic gangue to 25-30%, and adding the micro-fine particle copper-molybdenum bulk concentrate into a flotation tank for size mixing;
(2) pre-separating and roughing copper and molybdenum: carrying out copper-molybdenum pre-separation roughing operation on the ore pulp with the flotation concentration adjusted in the step (1) to obtain molybdenum rough concentrate with high copper content and roughing tailings 1; wherein, the technological conditions of the pre-separation and roughing operation of copper and molybdenum are as follows: firstly, 4000-6000 g/t of sodium sulfide is added, then 100-200 g/t of inhibitor (TMY01) and 20-30 g/t of molybdenite collecting agent (kerosene) are added, the ore pulp potential is-280-300 mV, and the flotation time is 4-6 min;
(3) grinding rough concentrate: grinding the molybdenum rough concentrate obtained in the step (2) until the content of the molybdenum rough concentrate in a-0.037 mm granularity level accounts for 75-85%;
(4) copper and molybdenum reinforced separation: carrying out copper-molybdenum reinforced separation flotation operation on the ore pulp ground in the step (3) to obtain copper-molybdenum reinforced separation flotation molybdenum rough concentrate and reinforced separation rough tailings 2; wherein, the technological conditions of the copper-molybdenum reinforced separation flotation operation are as follows: firstly adding 2000-3000 g/t of sodium sulfide, then adding 50-100 g/t of inhibitor TMY01, wherein the ore pulp potential is-300 to-320 mV, and the flotation time is 3-4 min;
(5) molybdenum scavenging: combining the rougher tailings 1 and the rougher tailings 2 obtained in the step (2) and the step (4) respectively, and then carrying out copper-molybdenum separation scavenging operation to obtain scavenged concentrate and scavenged tailings, wherein the scavenged concentrate is returned to the copper-molybdenum pre-separation rougher operation, and the scavenged tailings are copper concentrate; wherein, the technological conditions of the copper-molybdenum separation scavenging operation are as follows: adding 1000-2000 g/t of sodium sulfide and 10-20 g/t of molybdenite collecting agent (kerosene), wherein the ore pulp potential is-280 mV to-300 mV, and the flotation time is 3-5 min;
(6) and (3) molybdenum concentration: carrying out five times of concentration operations of molybdenum concentration I, molybdenum concentration II, molybdenum concentration III, molybdenum concentration IV and molybdenum concentration V on the copper-molybdenum reinforced separation flotation molybdenum rough concentrate obtained in the step (4) to obtain a final molybdenum concentrate and five molybdenum concentration middlings, returning the molybdenum concentration I middlings to the copper-molybdenum pre-separation rough concentration operation, and sequentially returning the molybdenum concentration II, molybdenum concentration III, molybdenum concentration IV and molybdenum concentration V middlings to the previous layer operation respectively; wherein, the selection operation process conditions are as follows: adding 1000-2000 g/t of sodium sulfide and 50-100 g/t of inhibitor (TMY01) into the molybdenum concentration I; adding 1000-2000 g/t of sodium sulfide and 30-50 g/t of inhibitor (TMY01) into the molybdenum concentration II; adding 20-30 g/t of inhibitor (TMY01) in the molybdenum concentration III operation; adding 500-1000 g/t of sodium sulfide in the molybdenum concentration IV operation; the molybdenum concentration V operation is blank concentration; the potential of the ore pulp is controlled to be-320 to-350 mV in each concentration operation section, and the flotation time is 3 to 5 min.
In the invention, the micro-fine particle copper-molybdenum bulk concentrate containing the hydrophobic gangue in the step (1) is the copper-molybdenum bulk concentrate containing the floatable silicate gangue such as mica, feldspar and the like, and molybdenite, copper minerals and gangue minerals are more intergrowth, the embedding granularity is fine, and the embedding relationship is complex.
In the invention, the pre-separation and roughing operation of copper and molybdenum in the step (2) refers to that monomer molybdenite, copper and molybdenum-containing intergrowth minerals and copper minerals difficult to inhibit float out into rough concentrate.
In the invention, sodium sulfide is added in the steps (2), (4) and (6), so that on one hand, the original flotation collecting agent on the surface of the mineral can be analyzed, and hydrophilic substances are generated on the surface of the copper mineral; in addition, a reductive ore pulp atmosphere can be created, and the ore pulp potential critical interval of copper-molybdenum separation can be regulated and controlled.
In the invention, the TMY01 added in the steps (2), (4) and (6) is obtained by mixing a macromolecular inhibitor (one of locust bean gum and acacia gum), carboxymethyl cellulose or hydroxyethyl cellulose and chitosan according to a volume ratio of 1:1 (2-3), and the specific preparation method is as follows:
① respectively stirring a polymer inhibitor and carboxymethyl cellulose or hydroxyethyl cellulose in warm water of about 55-65 deg.C for 20-30 min under a magnetic stirrer with a beaker as a container, wherein the warm water has a pH value of 7.0 and a drug mass concentration of 1%;
② preparing dilute hydrochloric acid solution with pH of 3.0 with clear water at room temperature in a beaker;
③, dissolving chitosan in the dilute hydrochloric acid solution, stirring for 20-30 min under a magnetic stirrer, and diluting with clear water to obtain a neutral chitosan solution, wherein the pH value of the neutral chitosan solution is 7.0, and the mass concentration of the medicament is 1%;
④ mixing polymer inhibitor, carboxymethyl cellulose or hydroxyethyl cellulose, and chitosan solution to obtain TMY 01.
Compared with the prior art, the invention has the following advantages:
1. based on the influence of mineral floatability difference, mineral granularity and intergrowth content on flotation, the process flow of 'asynchronous copper and molybdenum separation-regrinding and reinforced separation of rough concentrate' is provided, the adverse influence of a 'strong pressure and strong pull' process operation mode on flotation is avoided, the problems of over-grinding, serious argillization phenomenon, difficulty in dehydration and filtration of concentrate, incomplete separation of intergrowth content and the like caused by direct ore grinding of copper and molybdenum mixed rough concentrate in the traditional process are solved, and the interference of argillaceous gangue minerals on the concentration process is reduced.
2. The process parameter of controlling the ore pulp potential by sodium sulfide is introduced, the floatability of molybdenum and copper sulfide minerals is further changed by adjusting the flotation ore pulp potential to realize effective separation of the molybdenum and copper sulfide minerals, and meanwhile, the coupling and good matching of the flotation granularity, the type and the amount of a medicament, the flotation time and the like and the ore pulp potential are realized by controlling parameters in the traditional flotation process, so that the flotation separation process is more stable.
3. Sodium sulfide is added in a segmented mode to create a reductive ore pulp environment, the suitable ore pulp potential interval for copper-molybdenum separation is regulated, meanwhile, the original collecting agent on the surface of copper minerals is resolved, hydrophilic substances are generated, and the accuracy of copper-molybdenum separation is improved.
4. An efficient combined inhibitor TMY01 for the pumice and copper minerals is developed, and TMY01 has the function of dispersing and inhibiting gangue slime, particularly can limit the floating of the pumice silicate minerals, eliminates the adverse effect of the argillized gangue on the copper and molybdenum separation process, can effectively inhibit the copper minerals, improves the copper and molybdenum separation precision, greatly reduces the use amount of sodium sulfide, and reduces the mineral separation labor intensity and medicament harm.
5. The qualified single molybdenum and copper concentrate is obtained, the metal content is reduced, the comprehensive recovery rate of the metal is improved, and the mineral separation production cost is saved.
6. The copper-molybdenum flotation separation method has the technical advantages of high separation efficiency, small reagent consumption, low ore grinding energy consumption and good ore dressing index, is energy-saving and environment-friendly, has high metal recovery rate and low ore dressing cost, is suitable for treating copper-molybdenum bulk concentrates which are difficult to separate, and can be effectively popularized and applied.
Drawings
FIG. 1 is a process flow diagram of flotation separation of copper-molybdenum bulk concentrate containing hydrophobic micro-particles.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
Preparation of medicine TMY01
① respectively putting locust bean gum and carboxymethyl cellulose in warm water of about 60 deg.C, stirring with a magnetic stirrer for 20-30 min to obtain the final product, wherein the warm water has pH of 7.0 and concentration of 1%;
② preparing dilute hydrochloric acid solution with pH of 3.0 with clear water at room temperature in a beaker;
③, dissolving chitosan in the dilute hydrochloric acid solution, stirring for 20-30 min under a magnetic stirrer, and diluting with clear water to obtain a neutral chitosan solution, wherein the pH value of the neutral chitosan solution is 7.0, and the concentration of the medicament is 1%;
④ mixing 1 times of locust bean gum solution, 1 times of carboxymethyl cellulose solution, and 2 times of chitosan solution to obtain TMY 01.
Second, mineral dressing process
The selected copper-molybdenum bulk concentrate contains 22.54% of copper, 0.76% of molybdenum and 22.16% of silicon, copper minerals mainly comprise chalcopyrite and bornite, molybdenum minerals mainly comprise molybdenite, and silicon-containing gangue minerals mainly comprise quartz, mica, feldspar and the like. In the copper-molybdenum bulk concentrate, mineral embedding characteristics are complex, embedding granularity is uneven, fine particles are mainly used, monomer dissociation is poor, and the intergrowth relationship of copper minerals, molybdenite and silicate gangue minerals is tight. When the ore sample is treated by the traditional separation process, fine copper or copper minerals growing together with hydrophobic gangue easily float upwards and enter the molybdenum concentrate, and molybdenum growing together with copper is easily inhibited, so that the molybdenum concentrate has low grade, high copper content and deviation of molybdenum recovery rate.
As shown in fig. 1, the sorting steps adopted in this embodiment are:
(1) sample preparation and size mixing: adjusting the concentration of the ore pulp to 30% by using the prepared micro-fine particle copper-molybdenum bulk concentrate containing hydrophobic gangue, and adding the micro-fine particle copper-molybdenum bulk concentrate into a flotation tank for size mixing;
(2) carrying out copper-molybdenum pre-separation roughing operation on the ore pulp with the flotation concentration adjusted in the step (1) to obtain molybdenum rough concentrate with high copper content and roughing tailings 1; wherein, the technological conditions of the pre-separation and roughing operation of copper and molybdenum are as follows: 6000g/t of sodium sulfide is added, then 100g/t of inhibitor TMY01 and 30g/t of molybdenite collecting agent kerosene are added, the ore pulp potential is-295 mV, and the flotation time is 6 min;
(3) grinding the molybdenum rough concentrate obtained in the step (2) until the content of the molybdenum rough concentrate in the granularity level of-0.037 mm accounts for 75%;
(4) carrying out copper-molybdenum reinforced separation flotation operation on the ore pulp ground in the step (3) to obtain copper-molybdenum reinforced separation flotation molybdenum rough concentrate and reinforced separation rough tailings 2; wherein, the technological conditions of the copper-molybdenum reinforced separation flotation operation are as follows: adding 2000g/t of sodium sulfide, then adding 100g/t of inhibitor TMY01, wherein the ore pulp potential is-300 mV, and the flotation time is 4 min;
(5) combining the rougher tailings 1 and the rougher tailings 2 obtained in the step (2) and the step (4) respectively, and then carrying out copper-molybdenum separation scavenging operation to obtain scavenged concentrate and scavenged tailings, wherein the scavenged concentrate is returned to the copper-molybdenum pre-separation rougher operation, and the scavenged tailings are copper concentrate; wherein, the technological conditions of the copper-molybdenum separation scavenging operation are as follows: adding 1000g/t of sodium sulfide and 10g/t of kerosene, wherein the potential of ore pulp is-290 mV, and the flotation time is 3 min;
(6) carrying out five times of concentration operation on the copper-molybdenum reinforced separation flotation molybdenum rough concentrate obtained in the step (4) to obtain final molybdenum concentrate and five molybdenum concentration middlings, returning the first concentration middlings to the copper-molybdenum pre-separation rough concentration operation, and then sequentially returning the four times of concentration middlings to the previous layer operation; wherein, the selection operation process conditions are as follows: 2000g/t of sodium sulfide and 50g/t of inhibitor TMY01 are added in the molybdenum concentration I operation, and the flotation time is 5 min; adding 1000g/t of sodium sulfide and 50g/t of inhibitor TMY01 into the molybdenum concentration II operation, wherein the flotation time is 4 min; adding 30g/t of inhibitor TMY01 into the molybdenum concentration III operation, and carrying out flotation for 4 min; adding 500g/t of sodium sulfide into the molybdenum concentration IV operation, wherein the flotation time is 4 min; the molybdenum concentration V operation is blank concentration, and the flotation time is 3 min; the potential of the ore pulp is controlled to be between-320 mV and-350 mV in each concentration operation section.
Beneficiation results are shown in table 1:
TABLE 1 flotation index
Example 2
Preparation of medicine TMY01
① respectively putting Arabic gum and hydroxyethyl cellulose in warm water of about 60 deg.C, stirring with a magnetic stirrer for 20-30 min to get final product, wherein the warm water has pH of 7.0 and concentration of 1%;
② preparing dilute hydrochloric acid solution with pH of 3.0 with clear water at room temperature in a beaker;
③, dissolving chitosan in the dilute hydrochloric acid solution, stirring for 20-30 min under a magnetic stirrer, and diluting with clear water to obtain a neutral chitosan solution, wherein the pH value of the neutral chitosan solution is 7.0, and the concentration of the medicament is 1%;
④ mixing 1 times of the gum arabic solution, 1 times of the hydroxyethyl cellulose solution and 3 times of the chitosan solution to obtain TMY 01.
Second, mineral dressing process
The selected copper-molybdenum bulk concentrate contains 20.16% of copper, 0.60% of molybdenum and 24.05% of silicon, copper minerals mainly comprise chalcopyrite and chalcocite, molybdenum minerals mainly comprise molybdenite, silicon-containing gangue minerals mainly comprise quartz and mica and contain a small amount of talc. The copper-molybdenum bulk concentrate has different molybdenum and copper intercalation particle sizes, mainly adopts micro-fine particle intercalation, has a large content of intergrowth, and has a complex intercalation relationship among copper minerals, molybdenite and silicate gangue minerals. The traditional separation process is adopted to treat the ore sample, the separation index is not ideal, the molybdenum concentrate grade is low, the copper content is higher, the dosage of the ore dressing agent is extremely large, and the phenomenon of mineral argillization is serious.
As shown in fig. 1, the sorting steps adopted in this embodiment are:
(1) sample preparation and size mixing: adjusting the concentration of the prepared micro-fine particle copper-molybdenum bulk concentrate containing hydrophobic gangue to 25%, and adding the micro-fine particle copper-molybdenum bulk concentrate into a flotation tank for size mixing;
(2) carrying out copper-molybdenum pre-separation roughing operation on the ore pulp with the flotation concentration adjusted in the step (1) to obtain molybdenum rough concentrate with high copper content and roughing tailings 1; wherein, the technological conditions of the pre-separation and roughing operation of copper and molybdenum are as follows: 4000g/t of sodium sulfide is added, 200g/t of inhibitor TMY01 and 20g/t of molybdenite collecting agent kerosene are added, the ore pulp potential is-280 mV, and the flotation time is 4 min;
(3) grinding the molybdenum rough concentrate obtained in the step (2) until the content of the molybdenum rough concentrate in the granularity level of-0.037 mm accounts for 75%;
(4) carrying out copper-molybdenum reinforced separation flotation operation on the ore pulp ground in the step (3) to obtain copper-molybdenum reinforced separation flotation molybdenum rough concentrate and reinforced separation rough tailings 2; wherein, the technological conditions of the copper-molybdenum reinforced separation flotation operation are as follows: adding 3000g/t of sodium sulfide, then adding 50g/t of inhibitor TMY01, wherein the ore pulp potential is-310 mV, and the flotation time is 3 min;
(5) combining the rougher tailings 1 and the rougher tailings 2 obtained in the step (2) and the step (4) respectively, and then carrying out copper-molybdenum separation scavenging operation to obtain scavenged concentrate and scavenged tailings, wherein the scavenged concentrate is returned to the copper-molybdenum pre-separation rougher operation, and the scavenged tailings are copper concentrate; wherein, the technological conditions of the copper-molybdenum separation scavenging operation are as follows: adding 2000g/t of sodium sulfide and 20g/t of kerosene, wherein the ore pulp potential is-285 mV, and the flotation time is 5 min;
(6) carrying out five times of concentration operation on the copper-molybdenum reinforced separation flotation molybdenum rough concentrate obtained in the step (4) to obtain final molybdenum concentrate and five molybdenum concentration middlings, returning the first concentration middlings to the copper-molybdenum pre-separation rough concentration operation, and then sequentially returning the four times of concentration middlings to the previous layer operation; wherein the selection operation process conditions are as follows: adding 1000g/t of sodium sulfide and 100g/t of inhibitor TMY01 into the molybdenum concentration I operation, wherein the flotation time is 5 min; 2000g/t of sodium sulfide and 30g/t of inhibitor TMY01 are added in the molybdenum concentration II operation, and the flotation time is 4 min; adding 20g/t of inhibitor TMY01 into the molybdenum concentration III operation, and carrying out flotation for 4 min; adding 1000g/t of sodium sulfide in the molybdenum concentration IV operation, wherein the flotation time is 4 min; the molybdenum concentration V operation is blank concentration, and the flotation time is 3 min; the potential of the ore pulp is controlled to be between-320 mV and-350 mV in each concentration operation section.
Beneficiation results are shown in table 2:
TABLE 2 flotation index
Claims (7)
1. A flotation separation method of copper-molybdenum bulk concentrate containing hydrophobic gangue micro-fine particles is characterized by comprising the following steps:
(1) sample preparation and size mixing: adjusting the concentration of the prepared micro-fine particle copper-molybdenum bulk concentrate containing hydrophobic gangue to 25-30%, and adding the micro-fine particle copper-molybdenum bulk concentrate into a flotation tank for size mixing;
(2) pre-separating and roughing copper and molybdenum: carrying out copper-molybdenum pre-separation roughing operation on the ore pulp with the flotation concentration adjusted in the step (1) to obtain molybdenum rough concentrate and rougher tailings 1;
(3) grinding rough concentrate: grinding the molybdenum rough concentrate obtained in the step (2) until the content of the molybdenum rough concentrate in a-0.037 mm granularity level accounts for 75-85%;
(4) copper and molybdenum reinforced separation: carrying out copper-molybdenum reinforced separation flotation operation on the ore pulp ground in the step (3) to obtain copper-molybdenum reinforced separation flotation molybdenum rough concentrate and reinforced separation rough tailings 2;
(5) molybdenum scavenging: combining the rougher tailings 1 and the rougher tailings 2 obtained in the step (2) and the step (4) respectively, and then carrying out copper-molybdenum separation scavenging operation to obtain scavenged concentrate and scavenged tailings, wherein the scavenged concentrate is returned to the copper-molybdenum pre-separation rougher operation, and the scavenged tailings are copper concentrate;
(6) and (3) molybdenum concentration: carrying out five times of concentration operations of molybdenum concentration I, molybdenum concentration II, molybdenum concentration III, molybdenum concentration IV and molybdenum concentration V on the copper-molybdenum reinforced separation flotation molybdenum rough concentrate obtained in the step (4) to obtain a final molybdenum concentrate and five molybdenum concentration middlings, returning the molybdenum concentration I middlings to the copper-molybdenum pre-separation rough concentration operation, and sequentially returning the molybdenum concentration II, molybdenum concentration III, molybdenum concentration IV and molybdenum concentration V middlings to the previous layer operation respectively;
the technological conditions of the pre-separation and roughing operation of copper and molybdenum are as follows: firstly, 4000-6000 g/t of sodium sulfide is added, then 100-200 g/t of inhibitor and 20-30 g/t of molybdenite collecting agent are added, the ore pulp potential is-280-300 mV, and the flotation time is 4-6 min;
the preparation method of the inhibitor comprises the following steps:
① respectively stirring the polymer inhibitor and carboxymethyl cellulose or hydroxyethyl cellulose in 55-65 deg.C warm water with pH 7.0 and mass concentration of the agent of 1% for 20-30 min with a magnetic stirrer in a beaker as container;
② preparing dilute hydrochloric acid solution with pH of 3.0 with clear water at room temperature in a beaker;
③, dissolving chitosan in the dilute hydrochloric acid solution, stirring for 20-30 min under a magnetic stirrer, and diluting with clear water to obtain a neutral chitosan solution, wherein the pH value of the neutral chitosan solution is 7.0, and the mass concentration of the medicament is 1%;
④ mixing polymer inhibitor, carboxymethyl cellulose or hydroxyethyl cellulose, and chitosan solution.
2. The flotation separation method of the hydrophobic gangue fine particle-containing copper-molybdenum bulk concentrate as claimed in claim 1, wherein the flotation conditions for the enhanced separation of copper and molybdenum are as follows: adding 2000-3000 g/t of sodium sulfide, then adding 50-100 g/t of inhibitor, wherein the ore pulp potential is-300-320 mV, and the flotation time is 3-4 min.
3. The flotation separation method for the hydrophobic gangue fine particle-containing copper-molybdenum bulk concentrate as claimed in claim 1, wherein the copper-molybdenum separation scavenging operation process conditions are as follows: adding 1000-2000 g/t of sodium sulfide and 10-20 g/t of molybdenite collecting agent, wherein the ore pulp potential is-280-300 mV, and the flotation time is 3-5 min.
4. The flotation separation method for copper-molybdenum bulk concentrate containing hydrophobic gangue fines according to claim 1, characterized in that the concentration operation process conditions are as follows: adding 1000-2000 g/t of sodium sulfide and 50-100 g/t of inhibitor into the molybdenum concentration I; adding 1000-2000 g/t of sodium sulfide and 30-50 g/t of inhibitor into the molybdenum concentration II; adding 20-30 g/t of inhibitor into the molybdenum concentration III operation; adding 500-1000 g/t of sodium sulfide in the molybdenum concentration IV operation; the molybdenum concentration V operation is blank concentration; the potential of the ore pulp is controlled to be-320 to-350 mV in each concentration operation section, and the flotation time is 3 to 5 min.
5. The flotation separation method for hydrophobic gangue fine particle-containing copper-molybdenum bulk concentrate according to claim 1 or 3, characterized in that the molybdenite collecting agent is kerosene.
6. The flotation separation method for the hydrophobic gangue fine particle-containing copper-molybdenum bulk concentrate according to claim 1, 2 or 4, characterized in that the inhibitor is obtained by mixing a polymer inhibitor, carboxymethyl cellulose or hydroxyethyl cellulose and chitosan according to a volume ratio of 1:1 (2-3).
7. The method of claim 6, wherein the polymeric depressant is one of locust bean gum and gum arabic.
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| CN113941434B (en) * | 2021-10-14 | 2023-08-15 | 西部矿业股份有限公司 | Beneficiation method for realizing efficient separation of copper and molybdenum by strengthening removal of copper and molybdenum concentrate |
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