Application of dialkyl disulfide compound as collecting agent in copper-molybdenum bulk flotation

Abstract

The invention provides application of a dialkyl disulfide compound as a collecting agent in copper-molybdenum bulk flotation, the general formula of the dialkyl disulfide compound is R1-S-S-R2, R1 and R2 are respectively and independently at least one of C1-C12 alkyl and C1-C12 alkenyl, and R1 and R2 are respectively and independently at least one of C1-C12 alkyl and C1-C12 alkenyl. According to the method, the dialkyl disulfide compound serves as the collecting agent to be applied to copper-molybdenum bulk flotation, the recovery rate of copper and molybdenum in minerals can be effectively increased, and loss of valuable metal in tailings is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral flotation, more particularly, to the application of a dihydrocarbyl disulfide compound as a collector in copper-molybdenum mixed flotation. BACKGROUND

[0002] China is rich in copper-molybdenum resources, but there are generally problems such as complex occurrence state, fine-grained dissemination, and prominent low-grade co-occurrence, which leads to low resource utilization rate. Flotation is one of the core technologies for the separation of fine-grained minerals, which realizes the separation of target minerals under the action of flotation reagents and bubbles by taking advantage of the differences in the physical and chemical properties of the mineral surface. The collector, as a key component of the flotation reagent, directly determines the selectivity and recovery efficiency of the flotation process. At present, diesel is often used as a collector in copper-molybdenum mixed flotation, but its specificity in interaction with sulfide minerals (target minerals) is poor, and it is easy to cause non-specific adsorption with gangue and other non-sulfide minerals, resulting in the mixing of gangue minerals and poor collection effect of fine-grained copper-molybdenum minerals, and the recovery rate is not ideal. In addition, diesel has limited ability to regulate foam performance, and phenomena such as over-stable foam or poor flowability often occur, which affects the separation operation.

[0003] Therefore, how to improve the enrichment effect of copper-molybdenum resources has become an urgent need to improve the utilization efficiency of copper-molybdenum resources. SUMMARY

[0004] Based on the above technical problems existing in the prior art, the present application provides a dihydrocarbyl disulfide compound as a collector for application in copper-molybdenum mixed flotation. The compound has stable physical and chemical properties, can form a good foam layer, is easy to scrape out, and improves the separation efficiency and operational convenience.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] The application of a dihydrocarbyl disulfide compound as a collector in copper-molybdenum mixed flotation, the general formula of the dihydrocarbyl disulfide compound is: R1-S-S-R2, wherein R1 and R2 are each independently at least one of C1-C12 alkyl and C1-C12 alkenyl.

[0007] Specifically, the dihydrocarbyl disulfide compound includes but is not limited to at least one of dimethyl disulfide, diethyl disulfide, dipropyl disulfide, dibutyl disulfide, dipentyl disulfide, dihexyl disulfide, and diallyl disulfide.

[0008] The present application also provides a method for copper-molybdenum mixed flotation, comprising the following steps:

[0009] S1, grinding: grinding the raw ore, adding water to make a slurry, and obtaining a slurry;

[0010] S2, roughing: adding a collector and a frother to the ore pulp to perform roughing, to obtain a roughing concentrate and a roughing tailing;

[0011] S3, first scavenging: adding a collector and a frother to the roughing tailing to perform scavenging, to obtain a first scavenging concentrate and a first scavenging tailing;

[0012] S4, second scavenging: adding a collector and a frother to the first scavenging tailing to perform scavenging, to obtain a second scavenging concentrate and a second scavenging tailing;

[0013] combining the roughing concentrate, the first scavenging concentrate and the second scavenging concentrate to obtain a copper-molybdenum mixed concentrate;

[0014] In the roughing and scavenging processes, the collector is the dihydrocarbyldisulfide compound of any of the above embodiments, and the frother is No. 2 oil.

[0015] In some embodiments, in the roughing process, the collector is added in an amount of 50-150 g / t, and the frother is added in an amount of 50-100 g / t.

[0016] In some embodiments, in the first scavenging process, the collector is added in an amount of 25-50 g / t, and the frother is added in an amount of 10-30 g / t.

[0017] In some embodiments, in the second scavenging process, the collector is added in an amount of 10-20 g / t, and the frother is added in an amount of 5-10 g / t.

[0018] In some embodiments, in step S1, the raw ore is ground to a particle size of -0.074 mm of more than 50%, and the pulp is adjusted to a concentration of 20-45%.

[0019] In some embodiments, in the roughing process, the collector is added and mixed for 2-4 min, then the frother is added and mixed for 1-3 min, and the flotation time is 3-5 min.

[0020] In some embodiments, in the first scavenging process, the collector is added and mixed for 1-2 min, then the frother is added and mixed for 1-2 min, and the scavenging time is 2-4 min.

[0021] In some embodiments, in the second scavenging process, the collector is added and mixed for 1-2 min, then the frother is added and mixed for 1-2 min, and the scavenging time is 2-4 min.

[0022] In some embodiments, in the raw ore, the copper grade is 0.005-0.045%, and the molybdenum grade is 0.05-0.40%.

[0023] Compared with the prior art, the application has the following advantages:

[0024] The application applies the dihydrocarbyl disulfide compound as a collector to copper-molybdenum mixed flotation. The dihydrocarbyl disulfide compound has good physical and chemical stability, can form a gas-liquid-solid three-phase interface stable and good foam layer, and is convenient for foam breaking and scraping. In addition, the dihydrocarbyl disulfide compound has strong collecting ability and good collecting effect on copper and molybdenum without compounding with other collectors, so that the recovery rate of copper and molybdenum can be effectively improved. Compared with the current collectors, the dihydrocarbyl disulfide compound can effectively reduce the loss of copper and molybdenum in low-grade copper-molybdenum ore and improve the recovery rate of copper and molybdenum, and the recovery rate of copper and molybdenum in low-grade complex copper-molybdenum ore can reach more than 64% and more than 95% respectively under the condition of the same amount. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The process flow chart of the application example 1 and the comparative example 1 is shown in the figure;

[0026] Figure 2 The flotation mineral real object figure of the application example is shown in the figure; wherein, the figures A, B and C are copper-molybdenum mixed concentrate, middlings and tailings respectively;

[0027] Figure 3 The flotation mineral real object figure of the comparative example is shown in the figure; wherein, the figures A, B and C are copper-molybdenum mixed concentrate, middlings and tailings respectively. DETAILED DESCRIPTION

[0028] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the application. However, the application can be practiced in a number of different ways without departing from the scope of the application, and the present application is not limited to the specific embodiments described below. The present application can be practiced with other systems, materials, and methods than those described below, and the scope of the present application is not limited to the specific embodiments described below.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] The ore sample used in the following examples and comparative examples is a certain copper-molybdenum ore in Shaanxi, and the main metal minerals thereof are molybdenite, pyrite, and a small amount of chalcopyrite, magnetite, pyrrhotite, chalcocite, galena, sphalerite; the gangue minerals are mainly quartz, and a small amount of feldspar, fluorite, mica and chlorite; the molybdenite is in a disseminated state in the vein.

[0031] Example 1

[0032] As Figure 1As shown in the method for copper-molybdenum mixed flotation, the method comprises the following steps:

[0033] S1, grinding the raw ore to a particle size of 55% of 0.074 mm, and adjusting the pulp to a flotation pulp concentration of 30%;

[0034] S2, roughing: adding 100 g / t of collector diethyl disulfide and 2 # oil 75 g / t to the pulp, roughing, to obtain roughing concentrate and roughing tailings;

[0035] S3, first scavenging: adding 25 g / t of collector diethyl disulfide and 2 # oil 12.5 g / t to the roughing tailings, and scavenging, to obtain first scavenging concentrate and first scavenging tailings;

[0036] S4, second scavenging: adding 12.5 g / t of collector diethyl disulfide and 2 # oil 6.25 g / t to the first scavenging tailings, and scavenging, to obtain second scavenging concentrate and second scavenging tailings;

[0037] Combining the first scavenging concentrate and the second scavenging concentrate to obtain copper-molybdenum mixed middlings.

[0038] The flotation results of the embodiment are shown in Table 1 and Figure 2 .

[0039] Table 1 Copper-molybdenum mixed flotation results

[0040]

[0041] As shown in Table 1, using the method of the present application to float the complex and low-grade associated molybdenum ore, the final copper product grade is 0.192%, the copper product recovery rate is 64.73%, the molybdenum product grade is 2.289%, and the molybdenum product recovery rate is 95.08%, which has excellent enrichment effect on copper and molybdenum.

[0042] Comparative Example 1

[0043] As Figure 1 shown, a method for copper-molybdenum mixed re-flotation, comprising the following steps:

[0044] S1, grinding the raw ore to a particle size of 55% of 0.074 mm, and adjusting the pulp to a flotation pulp concentration of 30%;

[0045] S2, roughing: adding 100 g / t of collector diethyl disulfide and 2 # oil 75 g / t to the pulp, roughing, to obtain roughing concentrate and roughing tailings;

[0046] S3, once scavenging: adding collector diesel 25 g / t and frother 2 # oil 12.5 g / t, and carrying out scavenging to obtain the once scavenging concentrate and the once scavenging tailings;

[0047] S4, twice scavenging: adding collector diesel 12.5 g / t and frother 2 # oil 6.25 g / t, and carrying out scavenging to obtain the twice scavenging concentrate and the twice scavenging tailings;

[0048] combining the once scavenging concentrate and the twice scavenging concentrate to obtain the copper-molybdenum mixed middlings.

[0049] The flotation results of the present comparative example are shown in Table 2 and Figure 3 .

[0050] Table 2 Copper-molybdenum mixed flotation results

[0051]

[0052] As shown in Table 2, using the traditional collector to carry out flotation on the complex-embedded and low-grade associated molybdenum ore, the molybdenum recovery rate is 93.22%, and the copper recovery rate is 62.18%. Compared with the flotation results of the method of the present application, the recovery rates of molybdenum and copper of the method of the present application are increased by 1.86% and 2.55% respectively, which shows that the method of the present application has a more excellent enrichment effect on copper and molybdenum.

[0053] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0054] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. Application of dialkyl disulfide compounds as collectors in copper-molybdenum mixed flotation, wherein the general formula of the dialkyl disulfide compounds is: R1-SS-R2, wherein, R1 and R2 are each independently at least one of C1-C12 alkyl and C1-C12 alkenyl groups.

2. The application according to claim 1, characterized in that, The dialkyl disulfide compound is at least one of dimethyl disulfide, diethyl disulfide, dipropyl disulfide, dibutyl disulfide, dipentyl disulfide, dihexyl disulfide, and diallyl disulfide.

3. A method for copper-molybdenum mixed flotation, characterized in that, Includes the following steps: S1. Grinding: Grind the raw ore into a fine powder, add water to make a slurry, and obtain a slurry. S2. Roughing: Collector and frother are added to the slurry to carry out roughing to obtain roughing concentrate and roughing tailings; S3. Primary scavenging: Collector and frother are added to the roughing tailings and scavenging is carried out to obtain primary scavenging concentrate and primary scavenging tailings. S4. Secondary scavenging: Collector and frother are added to the tailings of the primary scavenging to carry out scavenging, and secondary scavenging concentrate and secondary scavenging tailings are obtained. By combining the rougher concentrate, the primary scavenger concentrate, and the secondary scavenger concentrate, a copper-molybdenum mixed concentrate is obtained. In the roughing and scavenging processes, the collector is a dialkyl disulfide compound as described in claim 1 or 2; the foaming agent is No. 2 oil.

4. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, In the roughing process, the amount of collector added is 50-150 g / t; the amount of foaming agent added is 50-100 g / t.

5. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, During the single scavenging process, the amount of collector added is 25-50 g / t; the amount of foaming agent added is 10-30 g / t.

6. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, During the secondary scavenging process, the amount of collector added is 10-20 g / t; the amount of frother added is 5-10 g / t.

7. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, In step S1, the raw ore is ground until the particle size of -0.074mm accounts for more than 50%, and the slurry is adjusted to a slurry concentration of 20-45%.

8. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, During the roughing process, add the collector and mix for 2-4 minutes, then add the frother and mix for 1-3 minutes, with a flotation time of 3-5 minutes. During the primary and secondary scavenging processes, add the collector and mix for 1-2 minutes, then add the frother and mix for 1-2 minutes, with a scavenging time of 2-4 minutes.

9. The method for copper-molybdenum mixed flotation according to claim 3, characterized in that, The raw ore contains 0.005-0.045% copper and 0.05-0.40% molybdenum.

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