A method for treating copper-lead-zinc sulfide ore

Abstract

The present invention belongs to the field of mineral processing, and specifically relates to a method for processing copper-lead-zinc sulfide ores. For the copper-lead-zinc sulfide ores to be separated by flotation, the obtained pulp is introduced into a flotation machine through a grinding system for copper-lead mixed flotation, one roughing and two scavenging, and copper-lead mixed rough concentrate and scavenging tailings are obtained; the pulp is introduced into a flotation machine for zinc sulfide flotation, one roughing, three concentrating and two scavenging are performed, and the copper-lead rough concentrate pulp is introduced into a flotation machine for copper-lead mixed concentrating, and three mixed concentrating are performed in total; the pulp is sent to a copper-lead separation flotation machine for separation, and in this process, one roughing, three concentrating and two scavenging are performed, and finally copper sulfide concentrate and lead sulfide concentrate are obtained. The present invention provides a method for processing copper-lead-zinc sulfide ores that can effectively improve metal recovery, reduce production costs, improve adaptability to ores of different properties, and reduce environmental pollution.

Description

Technical Field

[0001] The invention belongs to the field of ore dressing, and in particular relates to a method for processing copper-lead-zinc sulfide ore. Background Art

[0002] Ore dressing is to process the raw ore mined from the mine, enrich useful minerals and discard useless gangue. The enriched useful minerals are called concentrates for metal smelting, and the gangue is discarded as tailings. Flotation is a method of separation based on the physical and chemical properties of the surface of mineral particles and the difference in mineral floatability. It uses various reagents to adjust the physical and chemical properties of the surface of various mineral particles and the flotation medium to expand the hydrophobic-hydrophilic (i.e. floatability) differences between various minerals and improve flotation efficiency. The flotation process of ore includes three operations: pulp preparation, dosing adjustment, and aeration flotation. Slurry preparation includes grinding, classification, and slurry adjustment (the purpose is to obtain particles of the required size and pulp of appropriate concentration). In practical applications, the flotation of ore pulp is a continuous process, consisting of several flotation machines, which are divided into multiple cycles according to the characteristics of the ore. Each cycle consists of 1~2 roughing and several fine and scavenging operations. The flotation effect of the ore is determined by the flotation characteristics of the ore, the equipment configuration process and the flotation reagent system. So far, sulfide copper-lead-zinc ore is still one of the more difficult ores to separate. In China, most of the flotation processes for it are to first flotate the copper-lead mixture, then flotate the zinc, and then flotate and separate the copper-lead mixed concentrate. The sulfide minerals of copper, lead and zinc in this type of ore are often densely coexisting, with fine and uneven embedded particle sizes, forming various structures. Therefore, it is difficult to achieve monomer dissociation during grinding, which affects the flotation effect. At the same time, there are often secondary copper minerals, which are prone to produce copper ions during the grinding process, causing the activation of zinc sulfide. As a result, it is difficult to suppress zinc sulfide in the process of copper-lead mixed flotation by suppressing zinc sulfide, and it is mixed into the copper-lead mixed concentrate, reducing the quality of the copper-lead mixed concentrate, making it difficult to flotate and separate the copper-lead mixed concentrate, and also resulting in a reduction in zinc recovery rate; when zinc is floated in the tailings of copper-lead mixed flotation, the commonly used collector is butyl xanthate, which has a strong collecting ability but poor selectivity. When the return water is returned for utilization, it will make it difficult to separate copper, lead and zinc by flotation, and there are also great difficulties in the utilization of the return water; in the copper-lead mixed flotation process, the zinc sulfide is difficult to suppress and the zinc sulfide is mixed into the copper-lead mixed concentrate, which reduces the quality of the copper-lead mixed concentrate and makes it difficult to separate the copper-lead mixed concentrate by flotation, and also leads to a reduction in the zinc recovery rate; when zinc is floated in the tailings of copper-lead mixed flotation, the commonly used collector is butyl xanthate, which has a strong collecting ability but poor selectivity. When the return water is returned for utilization, it will make it difficult to separate the copper, lead and zinc by flotation, and there are also great difficulties in the utilization of the return water; in the copper-lead mixed flotation process During the flotation separation process, a large amount of flotation reagents remain on the surface of the copper-lead mixed concentrate and in the pulp solution, which must be removed during flotation separation. Among the commonly used de-drug methods, sodium sulfide can desorb the reagents adsorbed on the surface of the mineral, so that it exists in the solution and then undergoes concentration and filtration to remove excess sodium sulfide and other reagents. However, the sodium sulfide consumption is large, and many de-drug equipment are required, making it difficult to connect with the subsequent process. Activated carbon can adsorb excess reagents in the pulp, but cannot desorb reagents on the surface of the mineral, so the de-drug is not thorough; copper-lead flotation separation has two schemes: suppressing copper and floating lead and suppressing lead and floating copper. The commonly used inhibitor for suppressing copper and floating lead is cyanide, and the commonly used inhibitor for suppressing lead and floating copper is dichromate. These reagents are highly toxic and pollute the environment. They are now banned in the field of flotation of non-ferrous metal sulfide ores. At present, many researchers have carried out a large number of studies on reagents and processes for cyanide-free and chromium-free copper-lead separation, but it is difficult to achieve a flotation separation effect with strong adaptability based on inhibitor research alone.Therefore, for sulfide copper-lead-zinc ores, seeking scientific and effective treatment methods is the key to solving existing problems.

[0003] With regard to the shortcomings of the prior art, the technical problems to be solved by the present invention are:

[0004] (1) The sulfide minerals of copper, lead and zinc are often densely coexisting, with fine and uneven distribution of particles, so it is difficult to achieve monomer dissociation during grinding. If the grinding process is unreasonable, the particle size characteristics of the grinding product will be poor, affecting the separation index;

[0005] (2) Since there are many types of copper minerals in this type of ore, in addition to primary copper minerals, it often contains secondary copper minerals. Copper ions are easily generated during the grinding process, causing the activation of zinc sulfide. As a result, it is difficult to suppress zinc minerals during the flotation of copper-lead mixtures. During the flotation process, zinc minerals are mixed into the copper-lead mixed concentrate, which reduces the quality of the copper-lead mixed concentrate and makes it difficult to separate the copper-lead concentrate. At the same time, it also leads to a decrease in zinc recovery rate.

[0006] (3) Copper and lead minerals are easy to float and have similar floatability. When they are mixed and floated, if the amount of collector used is large or the collector has low selectivity for the two, the subsequent separation of copper and lead will be more difficult.

[0007] (4) In the existing process, the collector commonly used in zinc flotation is butyl xanthate, which has a strong collecting ability but poor selectivity. When its return water returns to the overall process, when copper and lead are mixed and zinc is suppressed, it is difficult to suppress zinc and the difficulty of copper-lead separation increases, affecting the mineral processing indicators.

[0008] (5) The deoxidation process of the copper-lead mixed concentrate section is unreasonable, resulting in poor deoxidation effect, poor controllability and high deoxidation cost;

[0009] (6) During the flotation separation of copper and lead, whether the flotation copper suppresses lead or the flotation lead suppresses copper, the existing copper or lead suppressants have poor suppression effects, which affects the flotation index. In addition, copper suppressants (cyanide) and lead suppressants (dichromate) are highly toxic substances that pollute the environment. They are now prohibited from use in the flotation of non-ferrous metal sulfide ores. Summary of the invention

[0010] The invention overcomes the problems of low metal recovery rate in concentrate, high production cost, poor adaptability to different ores, high toxicity of copper-lead inhibitors and environmental pollution in the existing copper-lead-zinc sulfide flotation process, and provides a method for treating copper-lead-zinc sulfide ore which can effectively improve metal recovery rate, reduce production cost, improve adaptability to ores of different properties and reduce environmental pollution.

[0011] The specific technical scheme is as follows: the powder bin is connected to the ball mill I through a conveyor belt, the ball mill I, the pump pool I, the slurry pump I, and the hydrocyclone are connected in series in sequence, the lower end of the hydrocyclone is connected to the pump pool II through the ball mill II, and the upper end of the hydrocyclone is connected in series with the 1# mixing barrel, the 2# mixing barrel, the copper-lead rougher, the copper-lead scavenger 1, the copper-lead scavenger 2, the 3# mixing barrel, the 4# mixing barrel, the zinc rougher, the zinc scavenger 1, and the zinc scavenger 2 in sequence;

[0012] The concentrate outlet of the copper-lead scavenger 2 is connected to the copper-lead scavenger 1, and the concentrate outlet of the copper-lead scavenger 1 is connected to the copper-lead rougher;

[0013] The concentrate outlet of zinc scavenger 2 is connected to zinc scavenger 1; the concentrate outlet of zinc scavenger 1 is connected to zinc rougher;

[0014] The zinc rougher concentrate outlet is connected to the zinc concentrator 1 in the zinc concentrator system;

[0015] The tailings outlets of zinc concentrator 3, zinc concentrator 2 and zinc concentrator 1 are connected in series in sequence. The tailings outlet of zinc concentrator 1 is connected to the zinc rougher, the concentrate outlet of zinc concentrator 1 is connected to zinc concentrator 2, the concentrate outlet of zinc concentrator 2 is connected to zinc concentrator 3, and the concentrate outlet of zinc concentrator 3 is zinc sulfide concentrate;

[0016] The concentrate outlet of the copper-lead rougher is connected in series with the pump pool III, slurry pump II, ball mill III, 5# mixing barrel, 6# mixing barrel, and copper-lead concentrator 1; the tailings outlet of the copper-lead concentrator 1 is connected with the copper-lead rougher, and the tailings outlet of the copper-lead rougher is connected with the copper-lead scavenger;

[0017] The copper-lead concentrator 3, the copper-lead concentrator 2 and the copper-lead concentrator 1 are connected in series through the tailings outlet sequence, the concentrate outlet of the copper-lead concentrator 1 is connected to the copper-lead concentrator 2, and the concentrate outlet of the copper-lead concentrator 2 is connected to the copper-lead concentrator 3;

[0018] The three concentrate outlets of the copper-lead concentrator are connected in series with the thickener, 7# mixing barrel, 8# mixing barrel, 9# mixing barrel, 10# mixing barrel, 11# mixing barrel and lead rougher;

[0019] Lead concentrator three, lead concentrator two, lead concentrator one, lead rougher, lead scavenger one, and lead scavenger two are connected in series in sequence through the tailings outlet, and the tailings outlet of lead scavenger two is copper sulfide concentrate; the concentrate outlet of lead scavenger two is connected with lead scavenger one, the concentrate outlet of lead scavenger one is connected with the lead rougher, the concentrate outlet of the lead rougher is connected with lead concentrator one, the concentrate outlet of lead concentrator one is connected with lead concentrator two, the concentrate outlet of lead concentrator two is connected with lead concentrator three, and the concentrate outlet of lead concentrator three is lead sulfide concentrate.

[0020] (1) For the sulfide copper-lead-zinc ore to be separated by flotation, grind it to a particle size of less than 0.074 mm at a grinding concentration of 70%-75% through the grinding system, and then adjust the slurry concentration to 28%-35%. During grinding, 1000g / t of lime as an adjusting agent and 600g / t of YJ-1, a high-efficiency precipitant for copper and lead ions, must be added to the feed port of the first mill;

[0021] (2) The ore pulp obtained by the above (1) is introduced into the 1# stirring barrel, and zinc sulfate 2000g / t and sodium sulfite 1000g / t, which are inhibitors of zinc sulfide, are added to the slurry for 3 minutes, and then the slurry is introduced into the 2# stirring barrel, and copper and lead collectors Z-200 18g / t and YK906 10g / t are added to the slurry for 2 minutes. During the mixed flotation of copper and lead, Z-200 is a collector with better selectivity for copper, and YK906 is a collector with better selectivity for lead. The combination of the two reagents can better separate copper, lead and zinc, and also has an auxiliary effect on obtaining better results in the subsequent separation of copper and lead;

[0022] (3) The ore pulp obtained by the above (2) is introduced into the flotation machine for copper-lead mixed flotation. In this process, one roughing selection (floating for 5 minutes) and two scavenging selections (scavenging for 4 minutes each for scavenging one and two respectively) are carried out, wherein the first scavenging selection is added with zinc sulfide inhibitor zinc sulfate 800g / t + sodium sulfite 400g / t (slurry mixing for 3 minutes) and then copper-lead collector Z-200 5g / t + YK906 5g / t (slurry mixing for 2 minutes) before flotation, and the second scavenging selection is added with zinc sulfide inhibitor zinc sulfate 400g / t + sodium sulfite 200g / t (slurry mixing for 3 minutes) and copper-lead collector Z-200 2g / t + YK906 2g / t (slurry mixing for 2 minutes) before flotation. Copper-lead mixed rough concentrate and scavenging two tailings are obtained;

[0023] (4) The scavenged tailings obtained in the above (3) are introduced into the 3# stirring barrel, and 100 g / t of copper sulfate, an activator of zinc sulfide, is added to the slurry for 3 minutes. Then, the tailings are introduced into the 4# stirring barrel, and 35 g / t of YK906, a collector of zinc sulfide, and 10 g / t of 2# oil, a foaming agent, are added to the slurry for 2 minutes.

[0024] (5) The pulp obtained by the above (4) is introduced into a flotation machine for zinc sulfide flotation. In this process, one roughing selection (floating for 5 minutes), three cleaning selections (4 minutes, 3 minutes and 3 minutes for cleaning selections 1, 2 and 3 respectively) and two scavenging selections (4 minutes for cleaning selections 1 and 2 respectively), wherein 300g / t and 100g / t of lime are added to cleaning selections 1 and 2 respectively (slurry mixing for 3 minutes); 50g / t of copper sulfate, an activator of zinc sulfide, is added to scavenging selection 1 (slurry mixing for 3 minutes) and then 15g / t of YK906, a collector of zinc sulfide, is added (slurry mixing for 2 minutes); 25g / t of copper sulfate, an activator of zinc sulfide, is added to scavenging selection 2 (slurry mixing for 3 minutes) and then 10g / t of YK906, a collector of zinc sulfide, is added (slurry mixing for 2 minutes). Zinc sulfide concentrate and tailings are obtained. During the flotation process, YK906 is used as the collector for both zinc sulfide and lead sulfide, which effectively overcomes the influence of zinc flotation return water on the mixed flotation of copper and lead;

[0025] (6) The copper-lead mixed coarse concentrate obtained by the above (3) is sent to a ball mill for re-grinding to obtain a particle size of less than 0.038 mm, which reaches 90%. Then, it is introduced into the 5# mixing barrel, and zinc sulfate 200g / t + sodium sulfite 100g / t, an inhibitor of zinc sulfide, is added to the slurry for 3 minutes. Then, it is introduced into the 6# mixing barrel, and copper-lead collector Z-200 2g / t + YK906 3g / t is added to the slurry for 2 minutes. By re-grinding the mixed concentrate, copper minerals, lead minerals and zinc minerals are better separated, thereby improving the flotation separation effect.

[0026] (7) The copper-lead rough concentrate pulp obtained through the above (6) is introduced into the flotation machine for copper-lead mixed selection, and three mixed selections are carried out in total (selection one, two, and three are floated for 4 minutes, 3 minutes, and 3 minutes respectively). In this process, the selection two is added with zinc sulfide inhibitor 100g / t zinc sulfate + sodium sulfite 50g / t (slurry mixing for 3 minutes). The tailings of the selection one and the slurry of the 2# mixing tank in the above (2) are combined and flowed into the copper-lead mixed rough selection operation, and the copper-lead mixed concentrate is concentrated to a concentration of 60%;

[0027] (8) The copper-lead mixed concentrate (60%) in the pretreatment is de-doped by three-stage stirring (7#, 8# and 9#). The copper-lead mixed concentrate obtained by the above (7) is sent to the 7# stirring barrel, and 1200g / t of sodium sulfide and 2800g / t of activated carbon are added and stirred for 10 minutes, and then flow into the 8# and 9# stirring barrels in turn and stirred for 10 minutes each. Sodium sulfide desorbs the collector on the surface of the mineral into the solution, and the desorption efficiency is proportional to the concentration of sodium sulfide. Activated carbon can adsorb the flotation agent in the solution, and the adsorption rate is proportional to the concentration of activated carbon. The combination of the two can effectively remove the flotation agent in the slurry; in order to avoid short circuit of the adsorbent activated carbon during stirring, add 8# and 9# stirring barrels to continuously condition the slurry;

[0028] (9) The ore pulp obtained in step (8) above is introduced into the 10# mixing barrel, and the copper sulfide inhibitor YK520 5000g / t is added and mixed at a high concentration for 3 minutes. Then, the lead sulfide collector YK902 450g / t and the foaming agent 2# oil 100g / t are added to the 11# mixing barrel and mixed at a high concentration for 2 minutes. Then, clean water is added and the pulp is mixed to a pulp concentration of 10% to 20%. The high concentration mixing is performed before adding clean water to improve the inhibitory effect of the inhibitor YK520 on copper sulfide.

[0029] (10) The ore pulp obtained through the above (9) is sent to a copper-lead separation flotation machine for separation. During this process, a roughing selection (floating for 3 minutes), three cleaning selections (3 minutes, 2 minutes and 2 minutes for cleaning selections 1, 2 and 3 respectively), and two scavenging selections (2 minutes for scavenging selections 1 and 2 respectively). 600 g / t and 300 g / t of copper sulfide inhibitor YK520 are added to cleaning selections 1 and 2 respectively (3 minutes for each slurry mixing); 2000 g / t and 1000 g / t of copper sulfide inhibitor YK520 are added to scavenging selections 1 and 2 respectively (3 minutes for each slurry mixing); and 150 g / t and 100 g / t of lead sulfide collector YK902 are added to scavenging selections 1 and 2 respectively (2 minutes for each slurry mixing); at the same time, 50 g / t of frother 2# oil is added to scavenging selection 1 (2 minutes for slurry mixing). Finally, copper sulfide concentrate and lead sulfide concentrate are obtained.

[0030] Beneficial effects:

[0031] (1) The recovery rates of copper, lead and zinc metals have been greatly increased, and the harmful impurities that have a great impact on smelting in each product have been reduced;

[0032] (2) Low production cost. The unit price of the reagents used in this method is lower and the equipment configuration is reduced, so the production cost is naturally reduced;

[0033] (3) High utilization rate of flotation return water. This method can collect the return water in a unified manner, realize unified allocation and use, greatly improve the utilization rate of return water, and at the same time optimize the medium environment, improve the recovery rate, and have obvious advantages in operation controllability;

[0034] (4) Stronger adaptability to ores of different properties. This method improves key links in a targeted manner and uses highly selective beneficiation agents, which naturally enhances its adaptability;

[0035] (5) The reagents used are of low toxicity, degrade quickly, cause little pollution to the environment, and are highly safe and controllable. This method eliminates the highly toxic sodium cyanide and sodium dichromate, and especially eliminates the copper sulfide inhibitor sodium cyanide that was used in the previous copper suppression and lead flotation scheme. Instead, the reagents used are of low toxicity and degrade quickly, so they cause less pollution to the environment and are highly safe and controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1-1 and Figure 1-2 Taken together, this is the process flow of the present invention;

[0037] Figure 2 An equipment connection diagram of a method for processing copper-lead-zinc sulfide ore. DETAILED DESCRIPTION

[0038] Embodiment 1

[0039] A copper-lead-zinc sulfide ore, most of the copper minerals are chalcopyrite, with a small amount of chalcocite, covellite, etc.; the lead mineral is galena; the zinc mineral is sphalerite. In addition, the ore also contains a small amount of magnetite, pyrrhotite, pyrite, arsenopyrite, and limonite. The gangue minerals are mainly tremolite and diopside, followed by calcite and black column, and a small amount of quartz, garnet, muscovite and apatite. Its multi-element analysis is shown in Table 1.

[0040]

[0041] The present invention is used to implement the ore, and the specific steps are as follows:

[0042] (1) For the sulfide copper-lead-zinc ore to be separated by flotation, grind it to a particle size of less than 0.074 mm at a grinding concentration of 70%-75% through the grinding system, and then adjust the slurry concentration to 28%-35%. During grinding, 1000g / t of lime as an adjusting agent and 600g / t of YJ-1, a high-efficiency precipitant for copper and lead ions, must be added to the feed port of the first mill;

[0043] (2) The slurry obtained in the above (1) is introduced into the 1# stirring barrel, and zinc sulfate 2000 g / t and sodium sulfite 1000 g / t, which are inhibitors of zinc sulfide, are added to the slurry and mixed for 3 minutes. The slurry is then introduced into the 2# stirring barrel, and copper and lead collectors Z-200 18 g / t and YK906 10 g / t are added to the slurry and mixed for 2 minutes respectively;

[0044] (3) The ore pulp obtained by the above (2) is introduced into the flotation machine for copper-lead mixed flotation. In this process, one roughing selection (floating for 5 minutes) and two scavenging selections (scavenging for 4 minutes each for scavenging one and two respectively) are carried out, wherein the first scavenging selection is added with zinc sulfide inhibitor zinc sulfate 800g / t + sodium sulfite 400g / t (slurry mixing for 3 minutes) and then copper-lead collector Z-200 5g / t + YK906 5g / t (slurry mixing for 2 minutes) before flotation, and the second scavenging selection is added with zinc sulfide inhibitor zinc sulfate 400g / t + sodium sulfite 200g / t (slurry mixing for 3 minutes) and copper-lead collector Z-200 2g / t + YK906 2g / t (slurry mixing for 2 minutes) before flotation. Copper-lead mixed rough concentrate and scavenging two tailings are obtained;

[0045] (4) The scavenged tailings obtained in the above (3) are introduced into the 3# stirring barrel, and 100 g / t of copper sulfate, an activator of zinc sulfide, is added to the slurry for 3 minutes. Then, the tailings are introduced into the 4# stirring barrel, and 35 g / t of YK906, a collector of zinc sulfide, and 10 g / t of 2# oil, a foaming agent, are added to the slurry for 2 minutes.

[0046] (5) The pulp obtained through the above (4) is introduced into a flotation machine for zinc sulfide flotation. In this process, one roughing selection (floating for 5 minutes), three cleaning selections (cleaning for 4 minutes, 3 minutes and 3 minutes respectively) and two scavenging selections (scavenging for 4 minutes respectively) are carried out, wherein 300g / t and 100g / t of lime are added to cleaning for ...

[0047] (6) The copper-lead mixed coarse concentrate obtained by the above (3) is sent to a ball mill for re-grinding to obtain a particle size of less than 0.038 mm, which reaches 90%. Then, it is introduced into the 5# mixing barrel, and zinc sulfate inhibitor 200 g / t + sodium sulfite 100 g / t are added to the slurry for 3 minutes. Then, it is introduced into the 6# mixing barrel, and copper-lead collector Z-200 2 g / t + YK906 3 g / t are added to the slurry for 2 minutes.

[0048] (7) The copper-lead rough concentrate pulp obtained through the above (6) is introduced into the flotation machine for copper-lead mixed selection, and three mixed selections are carried out in total (selection one, two, and three are floated for 4 minutes, 3 minutes, and 3 minutes respectively). In this process, the selection two is added with zinc sulfide inhibitor 100g / t zinc sulfate + sodium sulfite 50g / t (slurry mixing for 3 minutes). The tailings of the selection one and the slurry of the 2# mixing tank in the above (2) are combined and flowed into the copper-lead mixed rough selection operation, and the copper-lead mixed concentrate is concentrated to a concentration of 60%;

[0049] (8) The copper-lead mixed concentrate (60%) in the pretreatment is de-doped by three-stage stirring (7#, 8# and 9#). The copper-lead mixed concentrate obtained by the above (7) is sent to the 7# stirring barrel, and 1200g / t of sodium sulfide and 2800g / t of activated carbon are added and stirred for 10 minutes, and then flowed into the 8# and 9# stirring barrels in turn and stirred for 10 minutes each;

[0050] (9) The slurry obtained through (8) above is introduced into the 10# mixing barrel, and the copper sulfide inhibitor YK520 5000g / t is added and the slurry is mixed at a high concentration for 3 minutes. Then, the lead sulfide collector YK902 450g / t and the foaming agent 2# oil 100g / t are added into the 11# mixing barrel and the slurry is mixed at a high concentration for 2 minutes. Then, clean water is added and the slurry is mixed to a slurry concentration of 10% to 20%.

[0051] (10) The ore pulp obtained through the above (9) is sent to a copper-lead separation flotation machine for separation. During this process, a roughing selection (floating for 3 minutes), three cleaning selections (3 minutes, 2 minutes and 2 minutes for cleaning selections 1, 2 and 3 respectively), and two scavenging selections (2 minutes for scavenging selections 1 and 2 respectively). 600 g / t and 300 g / t of copper sulfide inhibitor YK520 are added to cleaning selections 1 and 2 respectively (3 minutes for each slurry mixing); 2000 g / t and 1000 g / t of copper sulfide inhibitor YK520 are added to scavenging selections 1 and 2 respectively (3 minutes for each slurry mixing); and 150 g / t and 100 g / t of lead sulfide collector YK902 are added to scavenging selections 1 and 2 respectively (2 minutes for each slurry mixing); at the same time, 50 g / t of frother 2# oil is added to scavenging selection 1 (2 minutes for slurry mixing). Finally, copper sulfide concentrate and lead sulfide concentrate are obtained.

[0052]

[0053] Embodiment 2

[0054] In a complex sulfide copper-lead-zinc ore, the copper mineral is mainly chalcopyrite, with traces of tetrahedrite, chalcocite and azurite; the lead mineral is galena; the zinc mineral is sphalerite; the iron minerals are magnetite and siderite, followed by a small amount of hematite and limonite, and other metal minerals are pyrite, a small amount of marcasite and arsenopyrite; the gangue minerals are mainly quartz and dolomite, followed by calcite and kaolinite, and a small amount of biotite, orthoclase, plagioclase and chlorite. Its multi-element analysis is shown in Table 3.

[0055]

[0056] The present invention is used to implement the ore, and the specific steps are as follows:

[0057] (1) For the sulfide copper-lead-zinc ore to be separated by flotation, grind it to a particle size of less than 0.074 mm at a grinding concentration of 70%-75% through the grinding system, and then adjust the slurry concentration to 28%-35%. During grinding, 1000g / t of lime as an adjusting agent and 600g / t of YJ-1, a high-efficiency precipitant for copper and lead ions, must be added to the feed port of the first mill;

[0058] (2) The slurry obtained in the above (1) is introduced into the 1# stirring barrel, and zinc sulfate 2000 g / t and sodium sulfite 1000 g / t, which are inhibitors of zinc sulfide, are added to the slurry and mixed for 3 minutes. The slurry is then introduced into the 2# stirring barrel, and copper and lead collectors Z-200 18 g / t and YK906 10 g / t are added to the slurry and mixed for 2 minutes respectively;

[0059] (3) The ore pulp obtained by the above (2) is introduced into the flotation machine for copper-lead mixed flotation. In this process, one roughing selection (floating for 5 minutes) and two scavenging selections (scavenging for 4 minutes each for scavenging one and two respectively) are carried out, wherein the first scavenging selection is added with zinc sulfide inhibitor zinc sulfate 800g / t + sodium sulfite 400g / t (slurry mixing for 3 minutes) and then copper-lead collector Z-200 5g / t + YK906 5g / t (slurry mixing for 2 minutes) before flotation, and the second scavenging selection is added with zinc sulfide inhibitor zinc sulfate 400g / t + sodium sulfite 200g / t (slurry mixing for 3 minutes) and copper-lead collector Z-200 2g / t + YK906 2g / t (slurry mixing for 2 minutes) before flotation. Copper-lead mixed rough concentrate and scavenging two tailings are obtained;

[0060] (4) The scavenged tailings obtained in the above (3) are introduced into the 3# stirring barrel, and 100 g / t of copper sulfate, an activator of zinc sulfide, is added to the slurry for 3 minutes. Then, the tailings are introduced into the 4# stirring barrel, and 35 g / t of YK906, a collector of zinc sulfide, and 10 g / t of 2# oil, a foaming agent, are added to the slurry for 2 minutes.

[0061] (5) The pulp obtained through the above (4) is introduced into a flotation machine for zinc sulfide flotation. In this process, one roughing selection (floating for 5 minutes), three cleaning selections (cleaning for 4 minutes, 3 minutes and 3 minutes respectively) and two scavenging selections (scavenging for 4 minutes respectively) are carried out, wherein 300g / t and 100g / t of lime are added to cleaning for ...

[0062] (6) The copper-lead mixed coarse concentrate obtained by the above (3) is sent to a ball mill for re-grinding to obtain a particle size of less than 0.038 mm, which reaches 90%. Then, it is introduced into the 5# mixing barrel, and zinc sulfate inhibitor 200 g / t + sodium sulfite 100 g / t are added to the slurry for 3 minutes. Then, it is introduced into the 6# mixing barrel, and copper-lead collector Z-200 2 g / t + YK906 3 g / t are added to the slurry for 2 minutes.

[0063] (7) The copper-lead rough concentrate pulp obtained through the above (6) is introduced into the flotation machine for copper-lead mixed selection, and a total of three mixed selections are carried out (selection 1, 2, and 3 are floated for 4 minutes, 3 minutes, and 3 minutes respectively). In this process, the selection 2 is added with zinc sulfide inhibitors such as zinc sulfate 100g / t + sodium sulfite 50g / t (slurry mixing for 3 minutes). The tailings of the selection 1 and the slurry of the 2# mixing tank in the above (2) are combined and flowed into the copper-lead mixed rough selection operation, and the copper-lead mixed concentrate is concentrated to a concentration of 60%.

[0064] (8) The copper-lead mixed concentrate (60%) in the pretreatment is de-doped by three-stage stirring (7#, 8# and 9#). The copper-lead mixed concentrate obtained by the above (7) is sent to the 7# stirring barrel, and 1200g / t of sodium sulfide and 2800g / t of activated carbon are added and stirred for 10 minutes, and then flowed into the 8# and 9# stirring barrels in turn and stirred for 10 minutes each;

[0065] (9) The slurry obtained through (8) above is introduced into the 10# mixing barrel, and the copper sulfide inhibitor YK520 5000g / t is added and the slurry is mixed at a high concentration for 3 minutes. Then, the lead sulfide collector YK902 450g / t and the foaming agent 2# oil 100g / t are added into the 11# mixing barrel and the slurry is mixed at a high concentration for 2 minutes. Then, clean water is added and the slurry is mixed to a slurry concentration of 10% to 20%.

[0066] (10) The ore pulp obtained through the above (9) is sent to a copper-lead separation flotation machine for separation. During this process, a roughing selection (floating for 3 minutes), three cleaning selections (3 minutes, 2 minutes and 2 minutes for cleaning selections 1, 2 and 3 respectively), and two scavenging selections (2 minutes for scavenging selections 1 and 2 respectively). 600 g / t and 300 g / t of copper sulfide inhibitor YK520 are added to cleaning selections 1 and 2 respectively (3 minutes for each slurry mixing); 2000 g / t and 1000 g / t of copper sulfide inhibitor YK520 are added to scavenging selections 1 and 2 respectively (3 minutes for each slurry mixing); and 150 g / t and 100 g / t of lead sulfide collector YK902 are added to scavenging selections 1 and 2 respectively (2 minutes for each slurry mixing); at the same time, 50 g / t of frother 2# oil is added to scavenging selection 1 (2 minutes for slurry mixing). Finally, copper sulfide concentrate and lead sulfide concentrate are obtained.

[0067]

[0068] 1. Add 1000g / t lime and 600g / t copper and lead high-efficiency precipitant YJ to the first mill of the grinding system, grind them to less than 0.074mm, accounting for 85%, and adjust the concentration to 28%~35%;

[0069] 2. In the 1# mixing barrel, add zinc sulfate + sodium sulfite 2000g / t + 1000g / t (zinc sulfide inhibitor) at a weight ratio of 2:1 and mix for 3 minutes, then add copper collector Z-200 18g / t and lead collector YK906 8g / t in the 2# mixing barrel and mix for 3 minutes, and then carry out copper-lead mixed roughing for 5 minutes;

[0070] 3. Send the copper-lead mixed coarse concentrate into the ball mill and grind it to less than 0.038mm, accounting for 90%;

[0071] 4. Add 200g / t+100g / t of zinc sulfate and sodium sulfite to the reground pulp, and then conduct copper and lead mixed selection for 4 minutes;

[0072] 5. In the pretreatment section, the final copper-lead mixed concentrate is concentrated to a concentration of 60% and then de-doped (7#, 8#, 9# mixing barrels);

[0073] 6. Add 1200g / t of sodium sulfide (desorbent) and 2800g / t of activated carbon (adsorbent) into the 7# stirring barrel in the pre-pretreatment section to prepare the slurry;

[0074] 7. After adding sodium sulfide and activated carbon in pretreatment, three stages of continuous stirring are required, and each stage of stirring time is 10 minutes, among which 8# and 9# stirring barrels are used for conditioning slurry;

[0075] 8. Add copper inhibitor YK520 5000g / t to the 10# mixing barrel (slurry after drug removal) and stir for 3 minutes at high concentration. Then add lead collector YK902 450g / t and foaming agent 2# oil 100g / t to the 11# mixing barrel and stir for 2 minutes at high concentration. Then add clean water to adjust the slurry to a concentration of 10%~20%, and perform lead roughing for 3 minutes (high concentration slurry adjustment and low concentration flotation separation).

[0076] 9. For copper and lead flotation separation and selection, it is necessary to add lead collector YK902 100g / t and foaming agent 2# oil 50g / t;

[0077] 10. For the flotation reagent system, the same collector YK906 was selected for copper-lead mixed flotation and zinc flotation to avoid the different reagents in the return water from having a greater impact on the product.

[0078] 11. In the flotation separation of copper and lead, when the scheme of suppressing copper and floating lead is adopted, the non-toxic, safe and environmentally friendly inhibitor YK520 is used to replace the highly toxic substance sodium cyanide.

[0079] Note: 1) After the ore pulp after dosing is adjusted, it enters each flotation unit (operation) for a certain period of time (determined by research), and then a concentrate and a tailing are obtained. Then the concentrate (foam product) enters the previous flotation unit, and the tailing enters the next flotation unit. In this way, several flotation units (operations) form a loop (circulation), and the processing process of each ore contains several loops (determined according to the properties of the ore).

[0080] 2) Roughing refers to the operation of preliminary sorting of the selected mineral raw materials, and the raw ore is separated into coarse concentrate and tailings through roughing; fine separation refers to the operation of further enriching the rough concentrate in order to increase the content of useful components in the rougher concentrate to meet industrial quality requirements; scavenging refers to the operation of further recovering useful components from the rougher tailings.

Claims

1. A method for treating copper-lead-zinc sulfide ore, characterized in that: The following steps are involved: (1) For the sulfide copper-lead-zinc ore to be separated by flotation, the grinding system is used to grind it to a particle size of less than 0.074 mm at a grinding concentration of 70% to 75%, and then the slurry concentration is adjusted to 28% to 35%. During grinding, 1000g / t of lime as a regulator and 600g / t of YJ-1, a high-efficiency precipitant for copper and lead ions, are added to the feed port of the first mill; (2) The slurry obtained in the above (1) is introduced into the 1# mixing tank, and after the slurry is prepared by adding 2000 g / t zinc sulfate and 1000 g / t sodium sulfite, which are inhibitors of zinc sulfide, the slurry is then introduced into the 2# mixing tank, and 18 g / t of copper and 10 g / t of lead collectors Z-200 and YK906 are added respectively to prepare the slurry; (3) Introducing the slurry obtained by the above (2) into a flotation machine for copper-lead mixed flotation, during which one roughing selection and two scavenging selections are performed, wherein the first scavenging selection is performed by adding zinc sulfide inhibitor zinc sulfate 800g / t + sodium sulfite 400g / t and then adding copper-lead collector Z-200 5g / t + YK906 5g / t for flotation, and the second scavenging selection is performed by adding zinc sulfide inhibitor zinc sulfate 400g / t + sodium sulfite 200g / t and copper-lead collector Z-200 2g / t + YK906 2g / t for flotation to obtain a copper-lead mixed rough concentrate and scavenging second tailings; (4) The scavenged tailings obtained in the above (3) are introduced into the 3# stirring barrel, and 100 g / t of copper sulfate, an activator of zinc sulfide, is added to prepare the slurry. Then, the tailings are introduced into the 4# stirring barrel, and 35 g / t of YK906, a collector of zinc sulfide, and 10 g / t of 2# oil, a foaming agent, are added to prepare the slurry. (5) The ore pulp obtained through the above (4) is introduced into a flotation machine for zinc sulfide flotation. During this process, one roughing selection, three cleaning selections and two scavenging selections are performed, wherein 300 g / t and 100 g / t of lime are added to the first and second cleaning selections respectively; 50 g / t of copper sulfate, an activator of zinc sulfide, is added to the first scavenging selection, followed by 15 g / t of YK906, a collector of zinc sulfide; 25 g / t of copper sulfate, an activator of zinc sulfide, is added to the second scavenging selection, followed by 10 g / t of YK906, a collector of zinc sulfide, to obtain zinc sulfide concentrate and tailings; (6) The copper-lead mixed coarse concentrate obtained by the above (3) is sent to a ball mill for re-grinding to obtain a particle size of less than 0.038 mm, which reaches 90%. Then, it is introduced into the 5# mixing barrel, and 200 g / t of zinc sulfate, an inhibitor of zinc sulfide, and 100 g / t of sodium sulfite are added to prepare the slurry. Then, it flows into the 6# mixing barrel, and 2 g / t of copper-lead collector Z-200 and 3 g / t of YK906 are added to prepare the slurry. By re-grinding the mixed concentrate, the copper minerals, lead minerals and zinc minerals are better separated, thereby improving the flotation separation effect. (7) The copper-lead rough concentrate pulp obtained through the above (6) is introduced into a flotation machine for copper-lead mixed selection, and a total of three mixed selections are performed; in this process, the second selection is added with zinc sulfide inhibitor 100g / t zinc sulfate + 50g / t sodium sulfite; the tailings of the first selection and the slurry of the 2# mixing tank in the above (2) are combined and flowed into the copper-lead mixed rough selection operation, and the copper-lead mixed concentrate is concentrated to a concentration of 60%; (8) The copper-lead mixed concentrate in the pretreatment is de-doped by using three-stage stirring in 7#, 8# and 9#. The copper-lead mixed concentrate obtained by the above (7) is sent to the 7# stirring barrel, 1200g / t of sodium sulfide and 2800g / t of activated carbon are added for stirring, and then flowed into the 8# and 9# stirring barrels in turn for stirring; (9) The ore pulp obtained through the above (8) is introduced into the 10# mixing barrel, and after adding 5000 g / t of YK520, a copper sulfide inhibitor, to prepare the pulp at a high concentration, 450 g / t of YK902, a lead sulfide collector, and 100 g / t of 2# oil, a foaming agent, are added to the 11# mixing barrel and stirred at a high concentration, and then clean water is added to prepare the pulp to a slurry concentration of 10% to 20%; high-concentration preparation is performed before adding clean water to improve the inhibitory effect of YK520 on copper sulfide; (10) The ore pulp obtained through the above (9) is sent to a copper-lead separation flotation machine for separation. During this process, one roughing selection, three fine selections and two scavenging selections are performed; 600 g / t and 300 g / t of copper sulfide inhibitor YK520 are added to the fine selections one and two, respectively; 2000 g / t and 1000 g / t of copper sulfide inhibitor YK520 are added to the scavenging selections one and two, respectively, and 150 g / t and 100 g / t of lead sulfide collector YK902 are added to the scavenging selections one and two, respectively; 50 g / t of frother 2# oil is added to the scavenging selection one; finally, copper sulfide concentrate and lead sulfide concentrate are obtained.

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