Rapid sulfur flotation method

Abstract

The invention provides a rapid sulfur flotation method. A fluorescence automatic analysis system is loaded, and a fluorescence analysis flow channel 1 detects the sulfur grade S1 of foam generated by a plurality of flotation tanks in first sulfur concentration operation; the fluorescence analysis flow channel 2 detects the sulfur grade S2 of foam generated by a plurality of flotation tanks in the sulfur roughing operation, the fluorescence online monitoring system monitors the grade of S in the two flow channels in real time and uploads data to the flotation expert system platform, if the error value of S1 and S2 is not larger than 3%, the flotation expert system remotely controls an electromagnetic switching valve to be opened, a rapid sulfur selection channel is started, and the rapid sulfur selection operation is completed. And rough concentrate foam generated by the corresponding flotation tank in the sulfur roughing operation is directly conveyed to the sulfur concentration secondary operation for rapid flotation. The method can reduce the circulation volume of rough concentrate, increase the operation yield, improve the flotation efficiency, improve the recovery rate of flotation operation, and reduce the sulfur content in tailings of sulfur separation operation.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metal processing, and specifically designs a rapid sulfur flotation method. Background Art

[0002] Copper sulfide ores are mainly recycled by froth flotation, which is a method of separating minerals from impurities or one mineral from another. Unpurified ore powder is stirred with water and reagents. The reagents preferentially adhere to the target minerals and change their surface properties. Air is then introduced into the mixture, and the target minerals float to the surface of the mixture with bubbles to form foam. The target minerals can be obtained after defoaming.

[0003] In the related technology, sulfur selection operations usually include sulfur roughing, sulfur scavenging and sulfur concentration operations. In the copper-sulfur priority flotation process, due to the characteristics of the ore itself and the inhibitory effect of high alkalinity on sulfur in the priority copper selection operation, as well as the influence of factors such as temperature and reagent activity on the sulfur selection process, the sulfur content of the total tailings in the sulfur selection operation is generally maintained at about 2%. In order to realize the resource reuse of tailings, it is necessary to reduce the sulfur content in the tailings. Therefore, it is necessary to provide a rapid sulfur flotation method to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a rapid sulfur flotation method, which optimizes the sulfur selection process, reduces the circulation load, speeds up the rapid selection of coarse concentrate, improves the recovery rate of sulfur concentrate, and ultimately reduces the sulfur grade of the total tailings.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A rapid sulfur flotation method comprises the following steps:

[0007] S1: Froth flotation method is used to select copper first, and sulfur ore pulp is obtained after copper selection;

[0008] S2: The froth flotation method is used to carry out sulfur roughing operation on the sulfur ore pulp, and the produced rough concentrate enters the sulfur concentrate operation for selection, and the process tailings enter the sulfur scavenging process for selection; the rough concentrate foam produced by the sulfur concentrate operation enters the sulfur concentrate operation for selection, and the process tailings return to the sulfur roughing operation for cyclic flotation; the rough concentrate produced by the sulfur scavenging operation enters the sulfur roughing operation, and the process tailings are discharged into the thickening tank as the total tailings for concentration; the concentrate produced by the sulfur concentrate operation is the final product and is recovered, and the process tailings return to the sulfur concentrate operation for cyclic flotation;

[0009] S3: Detect the sulfur grade S2 of the froth generated by multiple flotation cells in the sulfur refinement operation through the fluorescence analysis channel 2;

[0010] S4: The sulfur grade S1 of the foam produced by multiple flotation cells in the operation of channel 1 is analyzed by fluorescence. If the error value between S2 and S1 is not greater than 3%, the electromagnetic reversing valve is opened to directly transport the rough concentrate foam produced by the corresponding flotation cell in the sulfur roughing operation to the sulfur concentrate operation for rapid flotation.

[0011] Preferably, in step S4, "directly transporting the coarse concentrate foam produced by the flotation tank to the sulfur concentrate for rapid flotation" is specifically:

[0012] S41: Based on the online fluorescence analysis system, the sulfur concentrate of the fluorescence analysis channel 1 and the fluorescence channel 2 is sampled and analyzed in real time to obtain the detection value S1 of the fluorescence channel 1 and the detection value S2 of the fluorescence channel 2;

[0013] S42: The fluorescence analysis system uploads the sulfur concentrates S1 and S2 to the flotation expert system. The flotation expert system analyzes the difference between S1 and S2. If the difference is not greater than 3%, the system will issue a system command to open the electromagnetic switching valve.

[0014] S43 opens an outlet on the froth chute on the flotation tank, and transports the froth to a collection tank through an input pipeline for collection;

[0015] S44: a delivery pump is arranged in the collection tank, and an output pipeline of the delivery pump is connected to a flotation tank of sulfur refinement operation.

[0016] Preferably, a fluorescent sampling flow channel is provided on the input pipeline to regularly detect the sulfur grade of the foam generated in the flotation tank during the sulfur roughing operation. If the error value between S1 and S2 is not greater than 3%, the electromagnetic switching valve on the input pipeline is opened; if it is greater than 3%, the electromagnetic switching valve on the input pipeline is closed.

[0017] Preferably, the pH value of the sulfur-selected ore slurry is 7-8.

[0018] Preferably, in the sulfur roughing operation, xanthate with a concentration of 10% is added as a collector for the sulfur selection operation, the unit consumption of the reagent is 108g / t, and the addition flow rate is 1800ml / min; in the sulfur sweeping operation, xanthate with a concentration of 10% is added as a collector for the sulfur selection operation, the unit consumption of the reagent is 36g / t, and the addition flow rate is 600ml / min.

[0019] Compared with the related art, the rapid sulfur flotation method provided by the present invention optimizes the sulfur selection process, improves the sulfur selection yield, ensures that the grade of high-sulfur concentrate is not affected, reduces the circulation load of each operation, improves the concentrate operation recovery rate, and reduces the sulfur content in the total tailings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0021] Figure 1 The present invention provides a flow chart of a rapid sulfur flotation method.

[0022] Figure 2 This is a schematic diagram of the rapid flotation channel switching process. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention are further described below in conjunction with the drawings of the present application.

[0024] Please refer to Figure 1 , Figure 2 The present invention provides a rapid sulfur flotation method, comprising the following steps:

[0025] S1: Froth flotation method is used to select copper first, and after copper selection is completed, sulfur selection raw ore pulp is obtained.

[0026] The froth flotation method is used to preferentially select copper using conventional technology in the art, which will not be described in detail in this embodiment. The tailings after flotation are sulfur-selected ore pulp, and the pH value of the sulfur-selected ore pulp is 7-8.

[0027] S2: The froth flotation method is used to carry out sulfur roughing operation on the sulfur ore pulp, and the produced rough concentrate enters the sulfur concentrate operation for selection, and the process tailings enter the sulfur scavenging process for selection; the rough concentrate foam produced by the sulfur concentrate operation enters the sulfur concentrate operation for selection, and the process tailings return to the sulfur roughing operation for cyclic flotation; the rough concentrate produced by the sulfur scavenging operation enters the sulfur roughing operation, and the process tailings are discharged into the thickening tank as the total tailings for concentration; the concentrate produced by the sulfur concentrate operation is the final product and is recovered, and the process tailings return to the sulfur concentrate operation for cyclic flotation;

[0028] The feed in the sulfur roughing operation includes three parts: the first part is the sulfur ore pulp, the second part is the coarse concentrate foam produced by the sulfur scavenging operation, and the third part is the return tailings of the sulfur concentrate operation. In this embodiment, the sulfur roughing operation flotation machine includes 5 flotation cells, and the three parts of pulp are fed into the first flotation cell in the sulfur roughing operation;

[0029] In the sulfur roughing operation, 10% xanthate is added as the collector of the sulfur selection operation, the reagent unit consumption is 108g / t, and the addition flow rate is 1800ml / min; in the sulfur sweeping operation, 10% xanthate is added as the collector of the sulfur selection operation, the reagent unit consumption is 36g / t, and the addition flow rate is 600ml / min. The added reagent is directly added to each flotation tank.

[0030] S3: Detect the sulfur grade S2 of the froth generated by multiple flotation cells in the sulfur refinement operation through the fluorescence analysis channel 2;

[0031] S4: The sulfur grade S1 of the foam produced by multiple flotation cells in the operation of channel 1 is analyzed by fluorescence. If the error value between S2 and S1 is not greater than 3%, the electromagnetic reversing valve is opened to directly transport the rough concentrate foam produced by the corresponding flotation cell in the sulfur roughing operation to the sulfur concentrate operation for rapid flotation.

[0032] The flotation process is carried out in sequence. The foam produced by each operation is called coarse sulfur concentrate, which overflows through the cofferdam in the flotation tank, is collected and enters the flotation process of the next operation, thereby realizing the enrichment and recovery of the sulfur concentrate. The sulfur roughing operation, sulfur concentrate operation 1 and sulfur concentrate operation 2 are carried out in sequence. Since the sulfur grade of the raw ore fed in the sulfur roughing operation is relatively high, the sulfur grade of the coarse concentrate produced in the first few tanks of the sulfur roughing operation is relatively high. The sulfur grade of the coarse sulfur concentrate produced in the sulfur roughing operation is compared with the sulfur grade of the coarse sulfur concentrate produced in the sulfur concentrate operation 1. If the two are close, they can be combined for processing. Directly introduce part of the coarse concentrate produced by the sulfur roughing operation into the sulfur concentrate operation 2, which can save the sulfur concentrate operation 1, thereby shortening the overall process flow, reducing the circulation volume in the flotation process, accelerating the rapid selection of coarse concentrate, and improving the yield of sulfur concentrate.

[0033] Specifically, in step S4, "directly conveying the foam produced by the flotation tank to the second sulfur concentration operation for rapid flotation" is specifically:

[0034] S41: Based on the online fluorescence analysis system, the sulfur concentrate of the fluorescence analysis channel 1 and the fluorescence channel 2 is sampled and analyzed in real time to obtain the detection value S1 of the fluorescence channel 1 and the detection value S2 of the fluorescence channel 2;

[0035] S42: The fluorescence analysis system uploads the sulfur concentrates S1 and S2 to the flotation expert system. The flotation expert system analyzes the difference between S1 and S2. If the difference is not greater than 3%, the system will issue a system command to open the electromagnetic switching valve.

[0036] S43 opens an outlet on the froth chute on the flotation tank, and transports the froth to a collection tank through an input pipeline for collection;

[0037] S44: a delivery pump is arranged in the collection tank, and an output pipeline of the delivery pump is connected to a flotation tank of sulfur refinement operation.

[0038] The input pipeline is provided with a valve to regularly detect the sulfur grade of the foam generated by the flotation tank during the sulfur roughing operation. If the error value between S1 and S2 is greater than 3%, the valve on the input pipeline is closed.

[0039] In this embodiment, the sulfur roughing process includes 5 flotation tanks. The froth produced by sulfur roughing, sulfur scavenging, sulfur concentrate 1 and sulfur concentrate 2 is sampled and tested, and the test results are shown in Table 1:

[0040] Table 1 The results of froth analysis of each flotation cell in the sulfur selection process

[0041]

[0042]

[0043] It can be found from Table 1 that the sulfur grade of the foam produced by the 36# flotation cell in the sulfur concentrate operation is 36.19%, which is the minimum value in the sulfur concentrate operation. In the sulfur roughing operation, the sulfur grades of the foam produced by the 16# and 17# flotation cells are 36.82% and 35.31%, respectively, and the errors with Smin are 0.63% and -0.88%, respectively, both within 3%, indicating that the sulfur grade of the foam produced by the 16# and 17# flotation cells is close to the sulfur grade of the foam produced by the first sulfur concentration. Therefore, the froth produced by the 16# and 17# flotation cells can omit the flotation process of sulfur concentrate and directly transport it to sulfur concentrate for rapid flotation.

[0044] After optimizing and improving the original process by using the rapid sulfur selection flotation method provided by the present invention, the main production indicators of sulfur selection before the improvement are compared with the main production indicators of sulfur selection after the improvement in the same period, and Table 2 and Table 3 are obtained.

[0045] Table 2 Main production indicators of sulfur selection before improvement

[0046] project June July August September October November December Grand total Sulfur concentrate% 48.30 48.30 48.11 48.00 48.49 47.51 46.73 47.91 Sulfur tailings% 2.15 1.95 2.00 1.96 2.15 1.96 2.38 2.08 Sulfur recovery rate % 74.26 74.22 74.00 73.68 74.64 72.94 68.01 73.04

[0047] Table 3 Main production indicators of improved sulfur selection

[0048] project June July August September October November December Grand total Sulfur concentrate% 46.38 46.86 46.94 48.05 47.56 46.34 47.56 47.03 Sulfur tailings% 1.75 1.52 1.59 1.71 1.64 1.70 1.64 1.65 Sulfur recovery rate % 74.43 75.10 74.37 73.34 73.19 74.06 73.19 74.03

[0049] By comparing the production indicators before and after the improvement, it can be seen that after the improvement, compared with the same period of previous years before the improvement, the sulfur content in the total tailings decreased from 2.08% to 1.65%, and the grade decreased by 0.43% cumulatively; at the same time, the cumulative sulfur recovery rate increased from 73.04% to 74.03%, while increasing the sulfur yield of coarse concentrate, ensuring that the grade of high-sulfur concentrate is not affected.

[0050] Compared with the related art, the rapid sulfur flotation method provided by the present invention optimizes the sulfur selection process, improves the sulfur selection yield, ensures that the grade of high-sulfur concentrate is not affected, reduces the circulation load of each operation, and improves the concentrate operation recovery rate.

[0051] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principles and spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A rapid sulfur flotation method, characterized in that: The steps include: S1: Froth flotation method is used to select copper first, and sulfur ore pulp is obtained after copper selection; S2: The froth flotation method is used to carry out sulfur roughing operation on the sulfur ore pulp, and the produced rough concentrate enters the sulfur concentrate operation for selection, and the process tailings enter the sulfur scavenging process for selection; the rough concentrate foam produced by the sulfur concentrate operation enters the sulfur concentrate operation for selection, and the process tailings return to the sulfur roughing operation for cyclic flotation; the rough concentrate produced by the sulfur scavenging operation enters the sulfur roughing operation, and the process tailings are discharged into the thickening tank as the total tailings for concentration; the concentrate produced by the sulfur concentrate operation is the final product and is recovered, and the process tailings return to the sulfur concentrate operation for cyclic flotation; S3: Detect the sulfur grade S2 of the froth generated by multiple flotation cells in the sulfur refinement operation through the fluorescence analysis channel 2; S4: The sulfur grade S1 of the foam produced by multiple flotation cells in the operation of channel 1 is analyzed by fluorescence. If the error value between S2 and S1 is not greater than 3%, the electromagnetic reversing valve is opened to directly transport the rough concentrate foam produced by the corresponding flotation cell in the sulfur roughing operation to the sulfur concentrate operation for rapid flotation.

2. The rapid sulfur flotation method according to claim 1, characterized in that: In step S4, "directly transporting the coarse concentrate foam produced by the flotation tank to the sulfur concentrate for rapid flotation" is specifically: S41: Based on the online fluorescence analysis system, the sulfur concentrate of the fluorescence analysis channel 1 and the fluorescence channel 2 is sampled and analyzed in real time to obtain the detection value S1 of the fluorescence channel 1 and the detection value S2 of the fluorescence channel 2; S42: The fluorescence analysis system uploads the sulfur concentrates S1 and S2 to the flotation expert system. The flotation expert system analyzes the difference between S1 and S2. If the difference is not greater than 3%, the system will issue a system command to open the electromagnetic switching valve. S43 opens an outlet on the froth chute on the flotation tank, and transports the froth to a collection tank through an input pipeline for collection; S44: a delivery pump is arranged in the collection tank, and an output pipeline of the delivery pump is connected to a flotation tank of sulfur refinement operation.

3. The rapid sulfur flotation method according to claim 2, characterized in that: The input pipeline is provided with a fluorescent sampling flow channel to regularly detect the sulfur grade of the foam generated by the flotation tank during the sulfur roughing operation. If the error value between S1 and S2 is not greater than 3%, the electromagnetic switching valve on the input pipeline is opened; if it is greater than 3%, the electromagnetic switching valve on the input pipeline is closed.

4. The rapid sulfur flotation method according to claim 1, characterized in that: The pH value of the sulfur ore slurry is 7-8.

5. The rapid sulfur flotation method according to claim 1, characterized in that: In the sulfur roughing operation, 10% xanthate is added as a collector for the sulfur selection operation, the unit consumption of the reagent is 108g / t, and the addition flow rate is 1800ml / min; in the sulfur sweeping operation, 10% xanthate is added as a collector for the sulfur selection operation, the unit consumption of the reagent is 36g / t, and the addition flow rate is 600ml / min.

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