A high-sulfur copper-lead-zinc low-basicity step flotation separation method

Abstract

The present application relates to a kind of high-sulfur copper sulfide lead zinc low alkalinity step flotation separation method, belong to mineral processing technical field.The high-sulfur copper sulfide lead zinc low alkalinity step flotation separation method, steps include: high-sulfur copper sulfide lead zinc ore is carried out and is grinded to obtain grinding ore slurry;The obtained grinding ore slurry adds JC-1 lead zinc combined inhibitor, and copper flotation obtains copper concentrate and copper flotation tailings;The obtained copper flotation tailings add JC-2 zinc combined inhibitor, and lead flotation obtains lead concentrate and lead flotation tailings;The obtained lead flotation tailings are carried out and are zinc flotation to obtain zinc concentrate and tailings.This method is green and environmental protection, and separation efficiency is high, production is easy to control, and reagent dosage is less, production cost is low, etc., realizes high-sulfur copper lead zinc efficient separation, and mineral resources are effectively utilized.

Description

Technical Field

[0001] This invention relates to a method for separating high-sulfur copper, lead, and zinc sulfides by low-alkalinity step-flotation, belonging to the field of mineral processing technology. Background Technology

[0002] In the flotation separation technology of high-sulfur copper-lead-zinc polymetallic ores, there are mainly two processes: preferential flotation and copper-lead mixed flotation—copper-lead separation—tailings zinc beneficiation. In the lead mixed flotation—copper-lead separation—tailings zinc beneficiation process, the more mature methods currently include the potassium dichromate method (lead suppression for copper flotation) and the cyanide method (copper suppression for lead flotation). However, both methods suffer from significant environmental pollution, and the suppression of pyrite often requires the addition of large amounts of lime, which can easily cause pipeline blockage and affect the smooth flow of the process. In the preferential flotation process, due to the copper ions generated during grinding, lead, zinc, and sulfur are easily floated but difficult to suppress. If the sphalerite in the ore contains droplets or fine-grained chalcopyrite, the separation of copper, lead, and zinc becomes even more difficult. To address the problems in copper-lead-zinc flotation separation, this invention proposes a high-sulfur copper-lead-zinc stepped flotation separation method under low alkalinity conditions, achieving efficient separation of difficult-to-separate copper-lead-zinc polymetallic sulfide ores.

[0003] Patent application number 2020101861501 discloses a method for processing copper-lead-zinc sulfide ore. The method involves a grinding system, where the resulting slurry is introduced into a flotation machine for mixed copper-lead flotation, including one roughing and two scavenging processes, to obtain a mixed copper-lead concentrate and scavenged tailings. The slurry is then introduced into a flotation machine for zinc sulfide flotation, including one roughing, three cleaning, and two scavenging processes. The copper-lead concentrate slurry is introduced into a flotation machine for mixed copper-lead cleaning, undergoing a total of three cleaning processes. Finally, the slurry is fed into a copper-lead separation flotation machine for separation, during which one roughing, three cleaning, and two scavenging processes are performed, ultimately yielding copper sulfide concentrate and lead sulfide concentrate. The application involves adding zinc inhibitors to copper-lead-zinc sulfide ore for flotation to obtain a mixed copper-lead concentrate and tailings. Zinc sulfide concentrate is then floated from the tailings. After the mixed copper-lead concentrate is de-treated, copper inhibitors are added for flotation to obtain copper sulfide concentrate and lead sulfide concentrate. However, this application still has problems such as complex process, large amount of reagents, and high cost. Summary of the Invention

[0004] To address the problems and shortcomings of the existing technologies, this invention provides a low-alkalinity stepwise flotation separation method for high-sulfur copper-lead-zinc sulfide ores. In processing high-sulfur copper-lead-zinc sulfide ores, this invention employs a process of first flotating copper, then lead, and finally zinc. During copper flotation, JC-1 lead-zinc combined depressant is added to effectively suppress lead and zinc minerals in the high-sulfur copper-lead-zinc sulfide ores, resulting in efficient copper concentrate flotation. Then, during lead flotation, JC-2 zinc combined depressant is added to enhance zinc suppression, particularly effective in suppressing the inclusion of droplet-like or fine-grained chalcopyrite in sphalerite, thus obtaining lead concentrate. Finally, the lead flotation tailings are flotated to obtain zinc concentrate. This invention is achieved through the following technical solutions.

[0005] A method for separating high-sulfur copper-lead-zinc sulfide copper ...

[0006] S1. The high-sulfur copper-lead-zinc sulfide ore is slurried and ground to obtain a grinding slurry;

[0007] S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and obtain copper concentrate and copper flotation tailings by copper flotation.

[0008] S3. Add JC-2 zinc combined depressant to the copper flotation tailings obtained in S2, and obtain lead concentrate and lead flotation tailings by lead flotation.

[0009] S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings.

[0010] During the preparation of the high-sulfur copper-lead-zinc ore slurry in S1, lime is added to adjust the pH to 9-10.

[0011] Zinc sulfate and sodium sulfite are added during grinding of the high-sulfur copper-lead-zinc ore in S1.

[0012] The S2-in-place JC-1 lead-zinc combination inhibitor is composed of CMC, humic acid, sodium cyanurate carbide, and thiourea in a mass ratio of 0.8:0.2:1:1, and the amount of JC-1 lead-zinc combination inhibitor added is 80-300 g / t.

[0013] In S2, copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor and collector Z-200 are added. During the first cleaning process, collector Z-200 is added. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings.

[0014] The JC-2 zinc combination inhibitor in S3 is made from sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combination inhibitor added is 50-200g / t.

[0015] In S3, lead flotation consists of one roughing, two scavenging, and three cleaning processes. JC-2 zinc combination inhibitor is added during both the roughing and first cleaning processes. The collectors are ethyl xanthate and aniline black. The tailings obtained after the two scavenging processes are lead flotation tailings.

[0016] In S4, zinc flotation consists of one roughing, two scavenging, and three cleaning processes. Copper sulfate and benzoyl hydroxamic acid are added as activators during the roughing process, while ethyl xanthate and aniline black are used as collectors.

[0017] The specific process is as follows:

[0018] S1. The high-sulfur copper-lead-zinc sulfide ore is slurried and ground to obtain grinding slurry; the slurry concentration is 25-30wt%, and 500g / t-1000g / t of lime is added during the slurry ...

[0019] S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and then perform copper flotation to obtain copper concentrate and copper flotation tailings. JC-1 lead-zinc combined inhibitor is composed of CMC, humic acid, sodium cyanurate carbide, and thiourea in a mass ratio of 0.8:0.2:1:1, and the addition amount of JC-1 lead-zinc combined inhibitor is 80-300 g / t. Copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor is added and stirred for 5-10 min, then 18-30 g / t of collector Z-200 is added and stirred for 1-5 min. During the first cleaning process, 5 g / t of collector Z-200 is added. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings.

[0020] S3. Add JC-2 zinc combined inhibitor to the copper flotation tailings obtained in S2, and then perform lead flotation to obtain lead concentrate and lead flotation tailings. The JC-2 zinc combined inhibitor is made of sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combined inhibitor added is 50-200 g / t. Lead flotation consists of one roughing, two scavenging, and three cleaning processes. During the roughing process, 50-200 g / t of JC-2 zinc combined inhibitor is added and stirred for 5-10 min. Then, 10 g / t-40 g / t of ethyl xanthate and 10 g / t of aniline black reagent collector are added and stirred for 1-5 min. The lead rough concentrate obtained from the roughing process is then ground to -400 mesh (95%) and then subjected to three cleaning processes. In cleaning I, 50-100 g / t of JC-2 is added. No reagent is added in cleaning II and cleaning III. The final product is lead concentrate, and the tailings obtained after the two scavenging processes are lead flotation tailings.

[0021] S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings. The zinc flotation consists of one roughing, two scavenging, and three cleaning processes. During the roughing process, 100-200 g / t copper sulfate and 20 g / t benzohydroxyxamic acid are added as activators and stirred for 5-10 min. 10 g / t-30 g / t ethyl xanthate and 10 g / t aniline black are added as collectors and stirred for 1-5 min.

[0022] The above g / t refers to the number of grams of reagent added per ton of high-sulfur copper-lead-zinc sulfide ore.

[0023] The compositions in the above-mentioned JC-1 lead-zinc combination inhibitor and JC-2 zinc combination inhibitor are commercially available reagents and products.

[0024] The beneficial effects of this invention are: the mineral processing reagents used in this method are green and environmentally friendly, the separation efficiency is high, the production is easy to control, the reagent dosage is small, and the production cost is low, thus achieving efficient separation of high-sulfur copper, lead, and zinc, and effectively utilizing mineral resources. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figure 1 As shown, the specific process of this high-sulfur copper-lead-zinc sulfide low-alkalinity stepwise flotation separation method is as follows:

[0029] S1. High-sulfur copper-lead-zinc sulfide ore (Cu 0.36%, Pb 1.30%, Zn 2.26%, Ag 23.99 g / t, S 7.02%) is prepared by slurry preparation and grinding to obtain grinding slurry; the slurry concentration is 25 wt%, and 500 g / t of lime is added during the slurry preparation process to adjust the pH to 9-10. During the grinding process, 950 g / t of zinc sulfate and 500 g / t of sodium sulfite are added, and the overflow fineness is controlled to be -200 mesh, accounting for 80%;

[0030] S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and perform copper flotation to obtain copper concentrate and copper flotation tailings. JC-1 lead-zinc combined inhibitor is composed of CMC, humic acid, sodium cyanurate carbide, and thiourea in a mass ratio of 0.8:0.2:1:1, and the addition amount of JC-1 lead-zinc combined inhibitor is 90 g / t. Copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor is added and stirred for 5 min, then collector 18 g / t Z-200 is added and stirred for 1 min. During the first cleaning process, collector Z-200 is added at a rate of 5 g / t. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings.

[0031] S3. Add JC-2 zinc combined inhibitor to the copper flotation tailings obtained in S2, and obtain lead concentrate and lead flotation tailings by lead flotation. JC-2 zinc combined inhibitor is made of sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combined inhibitor added is 200g / t. Lead flotation consists of one roughing, two scavenging and three cleaning processes. During the roughing process, 200g / t of JC-2 zinc combined inhibitor is added and stirred for 5 minutes. Then, 30g / t of ethyl xanthate and 10g / t of aniline black reagent collector are added and stirred for 1 minute. The lead rough concentrate obtained from the roughing process is then ground to -400 mesh (95%) and then cleaned three times. In cleaning I, 50g / t of JC-2 is added. No reagent is added in cleaning II and cleaning III. The final product is lead concentrate. The tailings obtained after the two scavenging processes are lead flotation tailings.

[0032] S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings. The zinc flotation consists of one roughing, two scavenging, and three cleaning processes. During the roughing process, 120 g / t copper sulfate and 20 g / t benzohydroxyxamic acid are added as activators and stirred for 5 min, and 30 g / t ethyl xanthate and 10 g / t aniline black are added as collectors and stirred for 5 min.

[0033] In this embodiment, the copper concentrate yield is 1.43%, Cu 21.33%, containing 5.48% Pb and 5.49% Zn, with a copper recovery rate of 83.54%; the lead concentrate yield is 1.86%, Pb 51.82%, containing 1.61% Cu and 9.95% Zn, with a lead recovery rate of 83.71%; the zinc concentrate yield is 3.80%, Zn 49.83%, containing 0.20% Cu and 0.86% Pb, with a zinc recovery rate of 84.15%; the copper concentrate is enriched with 691 g / t of Ag and has a silver recovery rate of 43.36%; the lead concentrate is enriched with 477 g / t of Ag and has a silver recovery rate of 39.13%; and the tailings contain 0.017% Cu, 0.10% Pb, and 0.10% Zn.

[0034] Example 2

[0035] like Figure 1As shown, the specific process of this high-sulfur copper-lead-zinc sulfide low-alkalinity stepwise flotation separation method is as follows:

[0036] S1. High-sulfur copper-lead-zinc sulfide ore (Cu 0.25%, Pb 0.59%, Zn 3.32%, Ag 11.2 g / t, S 5.13%) is prepared by slurry preparation and grinding to obtain grinding slurry; the slurry concentration is 30 wt%, and 500 g / t of lime is added during the slurry preparation process to adjust the pH to 9-10. During the grinding process, 820 g / t of zinc sulfate and 500 g / t of sodium sulfite are added to control the overflow fineness to be -200 mesh 83%;

[0037] S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and perform copper flotation to obtain copper concentrate and copper flotation tailings. JC-1 lead-zinc combined inhibitor is composed of CMC, humic acid, sodium cyanurate carbide, and thiourea in a mass ratio of 0.8:0.2:1:1, and the addition amount of JC-1 lead-zinc combined inhibitor is 120g / t. Copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor is added and stirred for 10 minutes, then 25g / t Z-200 collector is added and stirred for 5 minutes. During the first cleaning process, 5g / t collector Z-200 is added. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings.

[0038] S3. Add JC-2 zinc combined inhibitor to the copper flotation tailings obtained in S2, and obtain lead concentrate and lead flotation tailings by lead flotation. JC-2 zinc combined inhibitor is made of sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combined inhibitor added is 180g / t. Lead flotation consists of one roughing, two scavenging and three cleaning processes. During the roughing process, 180g / t of JC-2 zinc combined inhibitor is added and stirred for 10min. Then, 40g / t of ethyl xanthate and 10g / t of aniline black reagent collector are added and stirred for 5min. The lead rough concentrate obtained from the roughing process is then ground to -400 mesh (95%) and then cleaned three times. In cleaning I, 100g / t of JC-2 is added. No reagent is added in cleaning II and cleaning III. The final product is lead concentrate. The tailings obtained after the two scavenging processes are lead flotation tailings.

[0039] S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings. The zinc flotation consists of one roughing, two scavenging, and three cleaning processes. During the roughing process, 100 g / t copper sulfate and 20 g / t benzohydroxyxamic acid are added as activators and stirred for 5 min, and 25 g / t ethyl xanthate and 10 g / t aniline black are added as collectors and stirred for 5 min.

[0040] This embodiment yielded the following technical indicators: lead concentrate yield of 0.60%, lead grade of 76.64%, silver content of 1369 g / t, lead recovery rate of 86.22%, silver recovery rate of 69.27%; copper concentrate yield of 1.11%, copper grade of 20.24%, copper recovery rate of 91.99%; and zinc concentrate yield of 6.30%, zinc grade of 51.97%, zinc recovery rate of 94.40%.

[0041] Example 3

[0042] like Figure 1 As shown, the specific process of this high-sulfur copper-lead-zinc sulfide low-alkalinity stepwise flotation separation method is as follows:

[0043] S1. High-sulfur copper-lead-zinc sulfide ore (Cu 0.96%, Pb 6.75%, Zn 2.49%, Ag 85.5 g / t, containing 0.24% S1) is prepared by slurry preparation and grinding to obtain grinding slurry; the slurry concentration is 28 wt%, and 500 g / t of lime is added during the slurry preparation process to adjust the pH to 9-10. During the grinding process, 1000 g / t of zinc sulfate and 500 g / t of sodium sulfite are added to control the overflow fineness to be -200 mesh, accounting for 88%;

[0044] S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and then perform copper flotation to obtain copper concentrate and copper flotation tailings. JC-1 lead-zinc combined inhibitor is composed of CMC, humic acid, sodium cyanurate carbide, and thiourea in a mass ratio of 0.8:0.2:1:1, and the addition amount of JC-1 lead-zinc combined inhibitor is 180g / t. Copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor is added and stirred for 8 minutes, then 20g / t Z-200 collector is added and stirred for 3 minutes. During the first cleaning process, 5g / t collector Z-200 is added. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings.

[0045] S3. Add JC-2 zinc combined inhibitor to the copper flotation tailings obtained in S2, and obtain lead concentrate and lead flotation tailings by lead flotation. JC-2 zinc combined inhibitor is made of sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combined inhibitor added is 200g / t. Lead flotation consists of one roughing, two scavenging and three cleaning processes. During the roughing process, 200g / t of JC-2 zinc combined inhibitor is added and stirred for 8 minutes. Then, 30g / t of ethyl xanthate and 10g / t of aniline black reagent collector are added and stirred for 3 minutes. The lead rough concentrate obtained from the roughing process is then ground to -400 mesh (95%) and then cleaned three times. In cleaning I, 50g / t of JC-2 is added. No reagent is added in cleaning II and cleaning III. The final product is lead concentrate. The tailings obtained after the two scavenging processes are lead flotation tailings.

[0046] S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings. The zinc flotation consists of one roughing, two scavenging, and three cleaning processes. During the roughing process, 150 g / t copper sulfate and 20 g / t benzohydroxyxamic acid are added as activators and stirred for 5 min, and 30 g / t ethyl xanthate and 10 g / t aniline black are added as collectors and stirred for 5 min.

[0047] This embodiment yielded a copper concentrate yield of 3.66%, Cu 24.70%, Ag 928 g / t, and a copper recovery rate of 91.54%; the silver recovery rate in the copper concentrate was 39.70%; the lead concentrate yield was 8.63%, Pb 63.45%, Ag 462 g / t, and the lead recovery rate was 84.99%; the silver recovery rate in the lead concentrate was 46.50%; the zinc concentrate yield was 4.22%, Zn 47.15%, and the zinc recovery rate was 77.22%; the tailings contained Cu 0.02%, Pb 0.45%, and Zn 0.13%.

[0048] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for separating high-sulfur copper, lead, and zinc sulfides using low-alkalinity step-flotation, characterized by the following steps: include: S1. The high-sulfur copper-lead-zinc sulfide ore is slurried and ground to obtain a grinding slurry; S2. Add JC-1 lead-zinc combined inhibitor to the grinding slurry obtained in S1, and obtain copper concentrate and copper flotation tailings by copper flotation. S3. Add JC-2 zinc combined depressant to the copper flotation tailings obtained in S2, and obtain lead concentrate and lead flotation tailings by lead flotation. S4. The lead flotation tailings obtained in S3 are subjected to zinc flotation to obtain zinc concentrate and tailings. Lime is added during the preparation of the high-sulfur copper-lead-zinc sulfide ore slurry in S1 to adjust the pH to 9-10. Zinc sulfate and sodium sulfite are added during grinding of the high-sulfur copper-lead-zinc ore in S1. The JC-1 lead-zinc combination inhibitor in S2 is composed of CMC, humic acid, sodium cyanurate carbide and thiourea in a mass ratio of 0.8:0.2:1:1, and the amount of JC-1 lead-zinc combination inhibitor added is 80-300g / t. In S2, copper flotation consists of one roughing and three cleaning processes. During the roughing process, JC-1 lead-zinc combined inhibitor and collector Z-200 are added. During the first cleaning process, collector Z-200 is added. No reagents are added for the remaining two cleaning processes. The tailings remaining after the first roughing process are copper flotation tailings. The JC-2 zinc combination inhibitor in S3 is made from sodium cyanurate carbide and thiourea in a mass ratio of 1:1, and the amount of JC-2 zinc combination inhibitor added is 50-200g / t.

2. The method for separating high-sulfur copper-lead-zinc sulfide copper-zinc sulfide using low-alkalinity step-flotation according to claim 1, characterized in that: In S3, lead flotation consists of one roughing, two scavenging, and three cleaning processes. JC-2 zinc combination inhibitor is added during both the roughing and first cleaning processes. The collectors are ethyl xanthate and aniline black. The tailings obtained after the two scavenging processes are lead flotation tailings.

3. The method for separating high-sulfur copper-lead-zinc sulfide copper-zinc sulfide using low-alkalinity step-flotation according to claim 1, characterized in that: In S4, zinc flotation consists of one roughing, two scavenging, and three cleaning processes. Copper sulfate and benzoyl oxime are added as activators during the roughing process, while ethyl xanthate and aniline black are used as collectors.

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