Application of a combined inhibitor in flotation separation of copper-molybdenum bulk concentrate

Abstract

The present application relates to the field of mineral flotation reagent, in particular to application of a combined inhibitor in flotation separation of copper-molybdenum mixed concentrate. The present application first adds sodium sulfide / sodium hydrosulfide to the copper-molybdenum mixed concentrate for removing reagent; then adds the combined inhibitor to inhibit chalcopyrite; further adds collector and frother to obtain molybdenum rough concentrate and copper rough concentrate through roughing; the molybdenum rough concentrate is refined to obtain molybdenum concentrate, and the copper rough concentrate is scavenged to obtain copper concentrate. The combined inhibitor is composed of oxalyl dihydrazide and mercaptobenzoic acid organic matter, and the total amount of oxalyl dihydrazide and mercaptobenzoic acid organic matter in roughing is 0.5-8 kg / t of copper-molybdenum mixed concentrate. The present application can effectively improve the separation efficiency of copper-molybdenum flotation, reduce the amount of inhibitor, and has the advantages of green and efficient, clean and environmentally friendly, strong applicability, etc., and can realize efficient separation of copper-molybdenum mixed concentrate.

Description

TECHNICAL FIELD

[0001] The application relates to the field of mineral flotation, in particular to application of a combined inhibitor in flotation separation of copper-molybdenum mixed concentrate and belongs to the technical field of copper-molybdenum mineral separation. BACKGROUND

[0002] Molybdenum is a very important rare metal and strategic reserve resource, has good conductivity, processing stability and high-temperature high-strength performance, and is applied in various fields such as electronic product manufacturing, chemical industry, metallurgy, national defense and daily life. Copper metal also has a wide application in modern industry. However, the separation of copper-molybdenum ore has been a big problem for mineral separation. The copper-molybdenum separation method is mainly divided into two categories: one is a magnetic separation process, the principle of which is that chalcopyrite and molybdenite have magnetic difference, and by controlling a certain magnetic field strength, the two can be separated; the other is flotation separation. Traditional copper-molybdenum flotation separation methods include: (1) cyanide method, the action mechanism of which is that-CN can be adsorbed on the surface of chalcopyrite, reduce the adsorption of a collector, and form a complex with chalcopyrite, increase the hydrophilicity of the mineral, so that chalcopyrite is inhibited. The cyanide method has the characteristics of small dosage and good effect, but cyanide is highly toxic, and has high requirements for production safety and environmental protection. (2) Knox method, the inhibition mechanism of which is that Knox is dissolved in water to dissociate PO2S3 -2 and PO3S - , these ions generate hydrophilic and poorly soluble copper sulfide on the surface of copper, and have no obvious effect on molybdenite. Although the inhibitor has the advantages of good inhibition effect and small dosage, due to the toxicity of Knox in synthesis and the great pollution to the environment, the application of the inhibitor is limited. (3) Sulfide method, the action mechanism of which is that Na2S and NaHS dissolved in water produce HS - , HS - can change the hydrophobicity of copper minerals to hydrophilicity, so as to achieve the purpose of copper-molybdenum separation. However, its dosage is large, and the use of a large amount of sodium sulfide will cause environmental pollution. The above inorganic inhibitor method also has some organic inhibitor methods and many new inhibitors in recent years.

[0003] Due to the wide application of copper-molybdenum metal, the existing copper-molybdenum separation method has many problems, which leads to poor separation effect of copper-molybdenum mixed concentrate in China. Therefore, it is urgent to find a non-toxic and harmless, simple to use, and strong separation effect of selective inhibitor and flotation separation process. SUMMARY

[0004] In view of the deficiencies of the prior art, the application aims to provide a chalcopyrite combined inhibitor with low toxicity, strong selective inhibition effect and good separation effect and application thereof in a flotation process.

[0005] The application of the combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate includes the following steps:

[0006] (1) The copper-molybdenum mixed concentrate is first subjected to a reagent removal treatment, then a combined inhibitor is added to inhibit chalcopyrite, and then a molybdenite collector and a frother are added, so that the concentrate obtained by one roughing is a molybdenum rough concentrate, and the tailings are a copper rough concentrate; the combined inhibitor is composed of oxalyl dihydrazine and mercaptobenzoic acid organic matter at a mass ratio of 1-5:1-5;

[0007] (2) The molybdenum rough concentrate is subjected to cleaning, and the combined inhibitor is added each time, so that the concentrate obtained by final cleaning is a molybdenum concentrate; the copper rough concentrate is subjected to scavenging, and the tailings of scavenging are a copper concentrate.

[0008] As a preferred scheme, the application of the combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate, the total amount of the combined inhibitor in the roughing of the flotation separation of the copper-molybdenum mixed concentrate is 0.5-8 kg / t, preferably 0.5-5 kg / t per ton of the copper-molybdenum mixed concentrate. The combined inhibitor is composed of oxalyl dihydrazine and mercaptobenzoic acid organic matter at a mass ratio of 1-5:1-5.

[0009] As a preferred scheme, the application of the combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate, the mass ratio of oxalyl dihydrazine and mercaptobenzoic acid organic matter in the combined inhibitor is 1-5:1-5, further preferably 1-2:3-1. As a further preferred, the mercaptobenzoic acid organic matter is selected from at least one of dimercaptoterephthalic acid, 2-mercaptobenzoic acid, 3-mercaptobenzoic acid, 4-mercaptobenzoic acid and 4-mercaptophenylacetic acid.

[0010] As a further preferred scheme, in the combined inhibitor, the mass of dimercaptoterephthalic acid is greater than the mass of oxalyl dihydrazine. That is, the mass ratio of oxalyl dihydrazine and dimercaptoterephthalic acid in the combined inhibitor is 1:1.1-2.5.

[0011] As a preferred scheme, the application of the combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate, the flotation includes one roughing, several cleanings and several scavengings.

[0012] As a preferred scheme, the application of the combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate includes the following steps:

[0013] (A) 5-20 kg / t of sodium sulfide and / or sodium hydrosulfide is first added to the copper-molybdenum mixed concentrate for reagent removal, then a combined inhibitor is added to inhibit chalcopyrite, and then a collector and a frother are added, so that the concentrate obtained by one roughing is a molybdenum rough concentrate, and the tailings are a copper rough concentrate; the amount of the combined inhibitor is 0.5-8 kg / t, preferably 0.5-5 kg / t;

[0014] (B) the molybdenum rough concentrate is subjected to 2-5 times of cleaning, and a combined inhibitor is added each time, and the cleaning concentrate is a molybdenum concentrate; the copper rough concentrate is subjected to 1-3 times of scavenging, and a collector is added each time, and the scavenging tailings are a copper concentrate.

[0015] As a preferred solution, the application of a combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate,

[0016] The collector is kerosene or diesel oil or kerosene+diesel oil, and the roughing dosage is 0.1-1 kg / t;

[0017] The frother is No. 2 oil or MIBC, and the roughing dosage is 50-200 g / t.

[0018] As a preferred solution, the application of a combined inhibitor in the flotation separation of copper-molybdenum mixed concentrate, the dosage of the combined inhibitor in each cleaning is 0.05-8 times of the roughing dosage.

[0019] In the cleaning, the dosage of the combined inhibitor in the Nth cleaning is 0.3-0.6 times of the dosage of the combined inhibitor in the (N-1)th cleaning. The N is greater than or equal to 2. In industrial application, the value range of N is 3-5.

[0020] As a further preferred solution, in the first cleaning, the dosage of the combined inhibitor is greater than or equal to 1.2 kg / t.

[0021] In the application, when the mass of dimercaptoterephthalic acid is greater than the mass of oxalyl dihydrazine in the combined inhibitor (i.e. the mass ratio of oxalyl dihydrazine to dimercaptoterephthalic acid in the combined inhibitor is 1:1.1-2.5), the dosage in the roughing after the removal of the medicine can be less than 1 kg / t; the use of the medicine system in the later cleaning (such as the dosage of the combined inhibitor in the first cleaning is greater than or equal to 1.2 g / t) can realize the significant improvement of the grade and recovery rate of Mo, and also improve the recovery rate of Cu.

[0022] As a preferred solution, the application of a combined inhibitor in the flotation separation of copper-lead mixed concentrate, characterized in that: the dosage of the collector in the scavenging is 0.1-0.5 times of the roughing dosage.

[0023] The application is used for the flotation separation of copper-molybdenum, and has the following advantages:

[0024] Firstly, the amino group of the appropriate amount of oxalyl dihydrazine in the combined collector cooperates with the mercapto group of the appropriate amount of dimercaptoterephthalic acid to act on the copper sites on the chalcopyrite surface, and the effect of inhibiting chalcopyrite is strengthened.

[0025] Secondly, the cooperation of the appropriate amount and appropriate ratio of oxalyl dihydrazine and dimercaptoterephthalic acid can increase the adsorption sites on the chalcopyrite surface and increase the adsorption strength, thereby reducing the dosage of the inhibitor and achieving excellent separation effect.

[0026] Thirdly, the combined inhibitor has little inhibitory effect on molybdenum minerals, is good in selectivity and strong in applicability.

[0027] Fourthly, the combined inhibitor is non-toxic and environment-friendly, is beneficial to subsequent wastewater treatment or reuse of the concentrator, and is good in ecological benefits of protecting the surrounding of the concentrator.

[0028] Fifthly, the combined inhibitor has strong selective inhibitory effect on chalcopyrite, is strong in separation, and thus the molybdenum concentrate and copper concentrate obtained are high in grade. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The process flow chart of the closed-circuit test used in the embodiments of the present application. DETAILED DESCRIPTION

[0030] The present application will be further described below in combination with the embodiments, but is not limited to the present application.

[0031] Embodiment 1

[0032] The copper content of the test raw material (copper-molybdenum mixed concentrate) is 22.20wt%, the molybdenum content is 1.11wt%, and the process mineralogy research result shows that the main metallic minerals in the sample are chalcopyrite, pyrite and molybdenite. The application of the combined inhibitor provided by the present application in the flotation separation of the copper-molybdenum mixed concentrate is used to carry out a laboratory small-scale closed-circuit test on the ore sample, and the test specific steps are as follows:

[0033] 1) 10kg / t of sodium sulfide is added first for desorption, and then the combined inhibitor of oxalyl dihydrazine and dimercapto-p-xylylenedicarboxylic acid with a mass ratio of 1:1 is added in an amount of 5kg / t, and stirred for 3min per ton of copper-molybdenum mixed concentrate;

[0034] 2) 0.5kg / t of kerosene and 100g / t of MIBC are then added for once roughing;

[0035] 3) The rough tailings after roughing are subjected to twice scavenging, 0.25g / t of kerosene is added in scavenging 1, and 0.1g / t of kerosene is added in scavenging 2, and the scavenging tailings are used as copper concentrate;

[0036] 4) The rough concentrate after roughing is subjected to three times of cleaning, 1kg / t of the combined inhibitor is added in cleaning 1, 0.5kg / t of the combined inhibitor is added in cleaning 2, and 0.25kg / t of the combined inhibitor is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0037] The test results are shown in Table 1.

[0038] From the test results can be seen, using the combination of inhibitors and the use of the method provided by the application, laboratory small closed-circuit test can obtain molybdenum concentrate with 46.55% molybdenum grade, and the molybdenum recovery rate is 92.96%; the copper concentrate contains 22.65% copper and only 0.08% molybdenum, and the copper recovery rate is 99.76%.

[0039] Table 1

[0040]

[0041] Example 2

[0042] The copper content in the test raw material (copper-molybdenum mixed concentrate) is 27.52%, and the molybdenum content is 2.11%, and the process mineralogy research results show that the main metal minerals in the sample are chalcopyrite, molybdenite, pyrite and a small amount of chalcocite. The application of a combination of inhibitors provided by the application in the flotation separation of copper-molybdenum mixed concentrate is used for laboratory small closed-circuit test of the ore sample, and the specific steps are as follows:

[0043] 1) 20kg / t of sodium hydrosulfide is added first, and then 4kg / t of a combination of inhibitors with a mass ratio of oxalyl dihydrazine and dimercaptobenzoic acid of 2:1 is added, and stirring is carried out for 3min per ton of copper-molybdenum mixed concentrate;

[0044] 2) Then 0.5kg / t of kerosene and 150g / t of No. 2 oil are added for one roughing;

[0045] 3) The rough tailings after roughing are subjected to two times of scavenging, 0.25g / t of kerosene is added in scavenging 1, and 0.15g / t of kerosene is added in scavenging 2, and the scavenging tailings are used as copper concentrate;

[0046] 4) The rough concentrate after roughing is subjected to three times of cleaning, 1.5kg / t of a combination of inhibitors is added in cleaning 1, 0.7kg / t of a combination of inhibitors is added in cleaning 2, and 0.3kg / t of a combination of inhibitors is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0047] The test results are shown in Table 2.

[0048] From the test results can be seen, using the combination of inhibitors and the use of the method provided by the application, laboratory small closed-circuit test can obtain molybdenum concentrate with 46.55% molybdenum grade, and the molybdenum recovery rate is 92.96%; the copper concentrate contains 22.65% copper and only 0.08% molybdenum, and the copper recovery rate is 99.76%.

[0049] Table 2

[0050]

[0051] Example 3

[0052] The copper content in the test raw material (copper-molybdenum mixed concentrate) is 2.14%, and the molybdenum content is 45.59%, and the process mineralogy research result shows that the main metal mineral in the sample is molybdenite, chalcopyrite and a small amount of pyrite. The application of the combined inhibitor provided by the application in the flotation separation of the copper-molybdenum mixed concentrate is used for laboratory small closed-circuit test of the ore sample, and the specific steps of the test are as follows:

[0053] 1) 5 kg / t of sodium hydrosulfide is added first, and then 0.5 kg / t of the combined inhibitor with a mass ratio of oxalic dihydrazide to dimercapto-p-xylylenedicarboxylic acid of 1:2 is added, and stirring is performed for 3 min;

[0054] 2) Then, 1 kg / t of kerosene and 200 g / t of No. 2 oil are added, and one roughing is performed;

[0055] 3) The rough tailings after roughing are subjected to two times of scavenging, 0.5 g / t of kerosene is added in scavenging 1, and 0.25 g / t of kerosene is added in scavenging 2, and the scavenging tailings are used as copper concentrate;

[0056] 4) The rough concentrate after roughing is subjected to three times of cleaning, 2.5 kg / t of the combined inhibitor is added in cleaning 1, 1.2 kg / t of the combined inhibitor is added in cleaning 2, and 0.6 kg / t of the combined inhibitor is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0057] The test results are shown in Table 3.

[0058] As can be seen from the test results, by using the combined inhibitor and the use method thereof, the laboratory small closed-circuit test can obtain the molybdenum concentrate with a molybdenum grade of 49.75% and a copper content of only 0.27%, and the molybdenum recovery rate is 99.79%; the copper concentrate has a copper grade of 22.16% and a molybdenum content of only 1.12%, and the copper recovery rate is 88.47%.

[0059] Table 3

[0060]

[0061] Example 4

[0062] For the ore sample in Example 3, other conditions are consistent with those in Example 3, and the only difference is that the mass ratio of oxalic dihydrazide to dimercapto-p-xylylenedicarboxylic acid in the combined inhibitor is 1:1.5.

[0063] The test results are shown in Table 4.

[0064] From the test results can be seen, using the combination of inhibitors and the use of the method provided by the application, laboratory small closed-circuit test can obtain molybdenum concentrate of 50.16% molybdenum grade, containing copper only 0.25%, molybdenum recovery rate of 99.77%; copper concentrate in copper grade of 21.03%, containing molybdenum only 1.16%, copper recovery rate of 89.43%.

[0065] Table 4

[0066]

[0067] Example 5

[0068] For the ore sample in example 3, other conditions and example 3 are consistent, the difference is that the mass ratio of oxalic dihydrazide and dimercapto p-phthalic acid in the combination inhibitor is 1:3.

[0069] The test results are shown in Table 5.

[0070] From the test results can be seen, using the combination of inhibitors and the use of the method provided by the application, laboratory small closed-circuit test can obtain molybdenum concentrate of 50.16% molybdenum grade, containing copper only 0.25%, molybdenum recovery rate of 99.77%; copper concentrate in copper grade of 21.03%, containing molybdenum only 1.16%, copper recovery rate of 89.43%.

[0071] Table 5

[0072]

[0073] Example 6

[0074] For the ore sample in example 3, other conditions and example 3 are consistent, the difference is that the mass ratio of oxalic dihydrazide and dimercapto p-phthalic acid in the combination inhibitor is 1:3.

[0075] 1) first add 5kg / t of sodium hydrosulfide to each ton of copper-molybdenum mixed concentrate, then add the combination inhibitor of oxalic dihydrazide and dimercapto p-phthalic acid with a mass ratio of 1:2, the dosage is 0.75kg / t, stirring for 3min;

[0076] 2) then add 1kg / t of kerosene and 200g / t of No. 2 oil for one roughing;

[0077] 3) the rough tailings after roughing are subjected to two scavenging, 0.5g / t of kerosene is added in scavenging 1, 0.25g / t of kerosene is added in scavenging 2, and the scavenging tailings are used as copper concentrate;

[0078] 4) the rough concentrate after roughing is subjected to three cleaning, 1.25kg / t of combination inhibitor is added in cleaning 1, 0.6kg / t of combination inhibitor is added in cleaning 2, 0.3kg / t of combination inhibitor is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0079] The test results are shown in Table 6.

[0080] As can be seen from the test results, the laboratory small-scale closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 50.01%, a copper content of only 0.22%, and a molybdenum recovery rate of 99.76% by using the combined depressant and the method thereof; the copper concentrate has a copper grade of 21.55% and a molybdenum content of only 1.20%, and a copper recovery rate of 90.88%.

[0081] Table 6

[0082]

[0083]

[0084] Comparative Example 1

[0085] For the ore sample in Example 1, under the condition of keeping the process structure and other reagent systems unchanged, the oxalyl dihydrazine in the combined depressant is removed, and the laboratory small-scale closed-circuit test is carried out on the ore, and the specific steps are as follows:

[0086] 1) 10 kg / t of sodium sulfide is added first for removing reagents, and then 5 kg / t of dimercapto-p-xylylenedicarboxylic acid is added, and stirred for 3 min, in terms of per ton of copper-molybdenum mixed concentrate;

[0087] 2) 0.5 kg / t of kerosene and 100 g / t of MIBC are then added for once roughing;

[0088] 3) the rough tailings after roughing are subjected to twice scavenging, 0.25 g / t of kerosene is added in scavenging 1, and 0.1 g / t of kerosene is added in scavenging 2, and the scavenging tailings are used as copper concentrate;

[0089] 4) the rough concentrate after roughing is subjected to three times cleaning, 1 kg / t of dimercapto-p-xylylenedicarboxylic acid is added in cleaning 1, 0.5 kg / t of dimercapto-p-xylylenedicarboxylic acid is added in cleaning 2, and 0.25 kg / t of dimercapto-p-xylylenedicarboxylic acid is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0090] The test results are shown in Table 7.

[0091] As can be seen from the test results, after the oxalyl dihydrazine in the combined depressant is removed, the laboratory small-scale closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 42.48%, a molybdenum recovery rate of 86.86%, and a copper content of 5.12%; the copper concentrate has a copper grade of 22.57% and a molybdenum content of 0.15%, and a copper recovery rate of 99.47%. It is found by comparison that the inhibiting effect on copper is obviously weakened after the oxalyl dihydrazine is removed from the combined depressant, and the obtained molybdenum concentrate has a lower grade, a higher copper content, and a lower molybdenum recovery rate.

[0092] Table 7

[0093]

[0094] Comparative Example 2

[0095] For the ore sample in Example 1, under the condition of keeping the process structure and other reagent systems unchanged, the dimercapto-p-phenylenedicarboxylic acid in the combined inhibitor was removed, and a laboratory small-scale closed-circuit test was carried out on the ore, and the specific steps of the test were as follows:

[0096] 1) 10 kg / t of sodium sulfide was added first, and then 5 kg / t of oxalic dihydrazide was added, and stirred for 3 min, based on 1 ton of copper-molybdenum mixed concentrate;

[0097] 2) Then 0.5 kg / t of kerosene and 100 g / t of MIBC were added for roughing;

[0098] 3) The rough tailings after roughing were subjected to two times of scavenging, 0.25 g / t of kerosene was added in scavenging 1, and 0.1 g / t of kerosene was added in scavenging 2, and the scavenging tailings were used as copper concentrate;

[0099] 4) The rough concentrate after roughing was subjected to three times of cleaning, 1 kg / t of oxalic dihydrazide was added in cleaning 1, 0.5 kg / t of oxalic dihydrazide was added in cleaning 2, and 0.25 kg / t of oxalic dihydrazide was added in cleaning 3, and the cleaning concentrate was used as molybdenum concentrate.

[0100] The test results are shown in Table 8.

[0101] As can be seen from the test results, after removing the dimercapto-p-phenylenedicarboxylic acid from the combined inhibitor, a molybdenum concentrate with a molybdenum grade of 41.88% and a molybdenum recovery rate of 87.76% was obtained in the laboratory small-scale closed-circuit test, and the copper content was 6.27%; the copper grade in the copper concentrate was 22.50%, the molybdenum content was 0.14%, and the copper recovery rate was 99.34%. It was found by comparison that the inhibition effect on copper was obviously weakened after removing the dimercapto-p-phenylenedicarboxylic acid from the combined inhibitor, and the copper content in the obtained molybdenum concentrate was higher, and the molybdenum recovery rate decreased.

[0102] Table 8

[0103]

[0104] Comparative Example 3

[0105] The other conditions were consistent with Example 1, except that:

[0106] 4) The rough concentrate after roughing was subjected to three times of cleaning, 1 kg / t of oxalic dihydrazide was added in cleaning 1, 0.5 kg / t of oxalic dihydrazide was added in cleaning 2, and 0.25 kg / t of oxalic dihydrazide was added in cleaning 3, and the cleaning concentrate was used as molybdenum concentrate.

[0107] The test results are shown in Table 9.

[0108] From the test results, it can be seen that the removal of dimercapto groups in roughing operation also affects the inhibition effect on copper, and the molybdenum recovery rate also decreases.

[0109]

[0110] Comparative Example 4

[0111] Other conditions are consistent with Example 1, except that:

[0112] 1) 10 kg / t of sodium sulfide is added first for desorption, and then oxalic dihydrazide is added as an inhibitor, with a dosage of 5 kg / t, and stirring for 3 min, per ton of copper-molybdenum mixed concentrate;

[0113] The test results are shown in Table 10.

[0114] From the test results, it can be seen that the removal of dimercapto groups in roughing operation also affects the inhibition effect on copper, and the molybdenum recovery rate also decreases.

[0115] Table 10

[0116]

Claims

1. Use of a combination inhibitor in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The application comprises the following steps: (1) the copper-molybdenum mixed concentrate is first treated by removing reagents, then a combined depressant is added to depress chalcopyrite, and then a molybdenite collector and a frother are added, so that the concentrate obtained by one roughing is a molybdenum rough concentrate, and the tailings are a copper rough concentrate; the combined depressant is composed of oxalyl dihydrazine and a mercaptobenzoic organic substance in a mass ratio of 1-5:1-5; the total amount of the combined depressant in the roughing of the copper-molybdenum mixed concentrate flotation separation is 0.5-8 kg / t; the mercaptobenzoic organic substance is at least one selected from the group consisting of dimercaptoterephthalic acid, 2-mercaptobenzoic acid, 3-mercaptobenzoic acid, 4-mercaptobenzoic acid and 4-mercaptophenylacetic acid; (2) the molybdenum rough concentrate is subjected to cleaning, and the combined depressant is added each time, and the final cleaning concentrate is a molybdenum concentrate; the copper rough concentrate is subjected to scavenging, and the scavenging tailings are a copper concentrate.

2. Use of a combination inhibitor according to claim 1 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The total amount of the combined depressant in the roughing of the copper-molybdenum mixed concentrate flotation separation is 0.5-5 kg / t per ton of the copper-molybdenum mixed concentrate.

3. The use of a combination inhibitor according to claim 1 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The mass ratio of oxalyl dihydrazine to the mercaptobenzoic organic substance in the combined depressant is 1-2:3-1.

4. The use of a combination inhibitor according to claim 1 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The flotation comprises one roughing, several cleanings and several scavengings.

5. The use of a combination inhibitor according to claim 1 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The following steps are included: (A) 5-20 kg / t of sodium sulfide and / or sodium hydrosulfide is first added to remove reagents from the copper-molybdenum mixed concentrate, then a combined depressant is added to depress chalcopyrite, and then a collector and a frother are added, so that the concentrate obtained by one roughing is a molybdenum rough concentrate, and the tailings are a copper rough concentrate; the total amount of the combined depressant in the roughing of the copper-molybdenum mixed concentrate flotation separation is 0.5-5 kg / t; (B) the molybdenum rough concentrate is subjected to 2-5 cleanings, and the combined depressant is added each time, and the cleaning concentrate is a molybdenum concentrate; the copper rough concentrate is subjected to 1-3 scavengings, and a collector is added each time, and the scavenging tailings are a copper concentrate.

6. Use of a combination inhibitor according to claim 5 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The collector is kerosene or diesel oil or kerosene+diesel oil, and the roughing amount is 0.1-1 kg / t; The frother is No. 2 oil or MIBC, and the roughing amount is 50-200 g / t.

7. Use of a combination inhibitor according to claim 5 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: The amount of the combined depressant used in each cleaning is 0.05-8 times the amount used in roughing.

8. Use of a combination inhibitor according to claim 5 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: In the cleaning, the amount of the combined depressant used in the Nth cleaning is 0.3-0.6 times the amount used in the (N-1)th cleaning; N is greater than or equal to 2.

9. Use of a combination inhibitor according to claim 5 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: In the first cleaning, the amount of the combined depressant used is greater than or equal to 1.2 kg / t.

10. Use of a combination inhibitor according to claim 5 in the flotation separation of copper-molybdenum bulk concentrates, characterized in that: In the scavenging, the amount of the collector used is 0.1-0.5 times the amount used in roughing.

Images