Environment-friendly copper-lead bulk concentrate flotation separation method

Abstract

The invention discloses an environment-friendly flotation separation method for copper-lead bulk concentrate. The method comprises the following steps: (1) preparing copper-lead mixed ore pulp; (2) flotation pretreatment of copper-lead mixed ore pulp; (3) carrying out flotation on the copper-lead mixed ore pulp; and (4) performing solid-liquid separation to obtain concentrate. The flotation method has the advantages that the novel flotation method capable of efficiently and environmentally separating complex and difficult-to-separate copper-lead bulk concentrate is provided, and the copper grade and the copper recovery rate can be effectively improved; meanwhile, the selected chemicals are environment-friendly and nontoxic chemicals, so that the chemicals are wide in source, low in price and very friendly in environmental protection requirement; the method is not only a key for solving the current technical bottleneck, but also an inevitable requirement for promoting green and sustainable development of the mining industry.

Description

Technical field:

[0001] The invention relates to the flotation separation of a copper-lead mixed concentrate containing secondary copper ions and a fine-grained copper-lead mixed concentrate in the field of ore dressing, and in particular to an environmentally friendly copper-lead mixed concentrate flotation separation method. Background technology:

[0002] In the field of modern mining development, copper and lead, as key non-ferrous metal resources, are indispensable in the development of many industries such as electronics, construction, and automobile manufacturing. However, with the gradual depletion of easily exploitable ore deposits, complex and difficult-to-select copper-lead mixed concentrates have become the main treatment targets. This type of ore contains secondary copper, so the mineral composition is complex; the embedded particle size is small, and agglomeration will occur during the flotation process, which will reduce the adsorption selectivity of the flotation agent, making it difficult to accurately control the amount of agent used. Excessive agents may cause excessive changes in the surface properties of both minerals, further reducing their differences during the flotation process, making it difficult to achieve effective separation. Therefore, the separation efficiency using traditional methods is low, and the copper grade and copper recovery rate are low. At the same time, traditional flotation agents are toxic, and the wastewater generated after flotation is difficult to recycle, resulting in a waste of water resources and environmental pollution; and the high cost of agents increases the cost of flotation.

[0003] In recent years, although relevant researchers have tried to improve the separation effect by improving the flotation agent formula of copper-lead separation and optimizing process parameters, the effect is still not satisfactory, especially in the flotation separation of copper-lead mixed concentrate containing secondary copper ions, or in the flotation separation of fine-grained copper-lead mixed concentrate, they are almost helpless. Summary of the invention:

[0004] The present invention provides an environmentally friendly copper-lead mixed concentrate flotation separation method, which solves the problem of flotation separation of copper-lead mixed concentrate containing secondary copper ions, and can improve the flotation separation effect of fine-grained copper-lead mixed concentrate, reduce the requirements for the particle size range of copper-lead mixed concentrate, and effectively improve the copper grade and copper recovery rate; at the same time, flotation wastewater can be recycled and reused in the flotation process, reducing the waste of water resources and causing no pollution to the environment; the reagents used are widely available and low in price, which can reduce the flotation cost. .

[0005] The present invention is implemented by the following technical solutions:

[0006] An environmentally friendly copper-lead mixed concentrate flotation separation method comprises the following steps:

[0007] (1) Preparation of copper-lead mixed slurry: The concentrate product obtained after upper flotation of the raw ore containing copper, lead, zinc and silver is used as the copper-lead mixed slurry;

[0008] (2) Pre-flotation treatment of copper-lead mixed slurry: after the copper-lead mixed slurry obtained in step (1) flows by gravity into the 1# high-concentration stirring tank, activated carbon and sodium sulfide are added to the 1# high-concentration stirring tank for pre-de-drug treatment; the slurry after the pre-de-drug treatment is transported to the regrinding mill by gravity or pumping for regrinding de-drug treatment; the slurry after regrinding de-drug treatment enters the 2# slurry stirring tank for enhanced de-drug treatment; the slurry after enhanced de-drug treatment enters the 3# slurry stirring tank, and is adjusted before flotation by adding water, sodium carbonate, soluble carboxymethyl cellulose, sodium sulfite and Z200;

[0009] (3) flotation of the copper-lead mixed slurry: the slurry obtained in step (2) overflows from the outlet of the 3# slurry stirring tank to become the feed slurry of the copper-lead separation flotation system, and the feed slurry is separated by flotation to obtain copper concentrate foam and lead concentrate slurry;

[0010] (4) Solid-liquid separation to obtain concentrate: Copper concentrate foam and lead concentrate slurry are separated by solid-liquid separation to obtain copper concentrate products and lead concentrate products respectively.

[0011] Furthermore, it also includes step (5) filtrate water recycling: the filtrate water obtained in the solid-liquid separation process in step (4) is collected and recycled to the pre-flotation adjustment process in step (2) for slurry adjustment and the copper concentrate foam transportation process in step (4).

[0012] Furthermore, in the pre-de-drug treatment process in step (2), the amount of activated carbon used is 4-6 kg / t, the amount of sodium sulfide used is 50-100 g / t, and the pre-de-drug treatment time is 10 min.

[0013] Furthermore, in the step (2), the fineness of -200 mesh after regrinding in the regrinding mill is adjusted to 80% to 85%.

[0014] Furthermore, the drug removal time of the enhanced drug removal treatment in step (2) is 45 minutes.

[0015] Furthermore, in the pre-flotation adjustment process in step (2), firstly, water is added to the inlet of the 3# slurry stirring tank to adjust the slurry concentration to 21%, and then 1800-2300 g / t of sodium carbonate is added to adjust the pH value to between 9.5 and 10, 2000-2500 g / t of soluble carboxymethyl cellulose and 1000-1500 g / t of sodium sulfite are added, and the stirring time is 45 min; Z200 is added at the overflow port of the 3# slurry stirring tank, and the addition amount is 10-30 g / t.

[0016] Furthermore, the copper-lead separation flotation system in step (3) comprises two roughing selections, three scavenging selections, and three concentrating selections; the second roughing tailings obtained by the feed slurry after two roughing selections are subjected to three scavenging selections, and the third scavenging tailings obtained are lead concentrate slurry, and the foam products produced by each scavenging selection are returned to the previous selection section in turn to enter the process cycle; the foam products obtained by the feed slurry after the second roughing selection are combined and subjected to three concentrating selections, and the three-concentrating foam obtained is copper concentrate foam, and the tailings obtained by each concentrating selection are returned to the next selection section in turn to enter the process cycle;

[0017] Among them, 600-1000g / t of soluble carboxymethyl cellulose and 5-15g / t of Z200 are added at the entrance of the secondary roughing section, and 5-15g / t of Z200 are added at the entrance of the secondary scavenging section; 300-500g / t of soluble carboxymethyl cellulose are added at the entrance of the primary selection, 200-250g / t of soluble carboxymethyl cellulose are added at the entrance of the secondary selection, and 150-250g / t of soluble carboxymethyl cellulose are added at the entrance of the tertiary selection.

[0018] Furthermore, in the step (4), the copper concentrate foam flows into the copper concentrator by gravity through the pipeline, the bottom flow of the copper concentrator is fed into the copper high-concentration slurry stirring tank and pumped to the copper filter for filtration through the thickening pump, the overflow water of the copper concentrator and the filtrate water generated by the copper filter are collected into the copper return water collection tank; the filter cake obtained by filtration by the copper filter is discharged into the copper concentrate warehouse to become the copper concentrate product;

[0019] After the lead concentrate slurry overflows into the lead high-concentration slurry stirring tank, 2000-3000g / t of aluminum sulfate is added to adjust the slurry pH value to 7.0-7.5. At the same time, aluminum sulfate will produce aluminum hydroxide colloid after hydrolysis. Aluminum hydroxide colloid has strong adsorption capacity and adsorbs some impurities such as silicon and iron, causing them to precipitate, thereby achieving the purpose of purifying the slurry; it flows into the lead concentrator through the pipeline by gravity, and the bottom flow of the lead concentrator is fed into the lead high-concentration slurry stirring tank and is sent to the lead filter through a dense pump for filtration. The overflow water of the lead concentrator and the filtrate water produced by the lead filter are collected into the lead return water collection pool; the filter cake obtained by filtration by the lead filter is unloaded into the lead concentrate warehouse to become a lead concentrate product.

[0020] Furthermore, in step (5), the overflow water of the copper return water collection tank and the overflow water of the lead return water collection tank are both transported to the high-level return water tank by the return water pump, and the effluent of the high-level water tank is divided into two paths, one of which is led to the inlet of the 3# slurry stirring tank, and the mass concentration of the slurry is adjusted to 21% by adding water; the other path is led to the outlet pipe of the tertiary concentrated ore, and is used to flush the copper concentrate foam into the copper concentrator.

[0021] In the present invention, by adding activated carbon, the residual reagent in the ore pulp can be adsorbed, and the selectivity of the flotation reagent in the flotation stage can be improved; by adding sodium sulfide, the reagent adsorbed on the surface of the mineral in the ore pulp can be further removed; by adding sodium carbonate, the pH value is adjusted to between 9.5 and 10, so that the flotation reagent can play a better role; by adding soluble carboxymethyl cellulose, the agglomeration of mineral particles, especially fine mineral particles, can be prevented; by adding sodium sulfite, the oxidation of the mineral surface by oxygen is reduced, the stability of the mineral surface properties is maintained, the generation of secondary minerals is reduced, and it is beneficial to the subsequent dosage control of the flotation reagent; by adding Z200, it is beneficial to realize the separation of copper and lead minerals in the flotation process, and improve the quality and recovery rate of the copper and lead concentrates.

[0022] Advantages of the present invention:

[0023] The present invention proposes a novel flotation method capable of efficiently and environmentally friendly separating complex and difficult-to-select copper-lead mixed concentrates, which can effectively improve the copper grade and copper recovery rate; at the same time, since the reagents used in the present invention are all environmentally friendly reagents, the flotation wastewater can be recycled and reused after simple treatment and reused in the flotation process, thereby reducing the waste of water resources and causing no pollution to the environment; the reagents are widely available and low in price, which can reduce the flotation cost. Description of the drawings:

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a flotation process flow chart of Example 1;

[0026] Figure 2 This is a schematic diagram of the system connection for recycling the filtrate water in step (5) of Example 1.

[0027] In the figure: A lead concentrator, B lead filter, C lead return water collection tank, D copper concentrator, E copper filter, F copper return water collection tank, G high-level return water tank. Specific implementation method:

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] like Figure 1 , 2 An environmentally friendly copper-lead mixed concentrate flotation separation method is shown, comprising the following steps:

[0031] (1) Preparation of copper-lead mixed slurry: The concentrate product obtained after upper flotation of the raw ore containing copper, lead, zinc and silver is the copper-lead mixed slurry;

[0032] (2) Pre-flotation treatment of copper-lead mixed slurry: After the copper-lead mixed slurry obtained in step (1) flows by gravity into the 1# high-concentration stirring tank, activated carbon and sodium sulfide are added to the 1# high-concentration stirring tank for pre-de-drug treatment, the amount of activated carbon is 6 kg / t, the amount of sodium sulfide is 100 g / t, and the pre-de-drug treatment time is 10 min; the slurry after pre-de-drug treatment is transported to a regrinding mill (a 100L sand mill is used in this embodiment) by gravity or pumping for regrinding and de-drug treatment, and the fineness of -200 mesh after regrinding is adjusted to 85%; the slurry after regrinding and de-drug treatment enters the 2# slurry stirring tank for Strengthen the de-doping treatment, the de-doping time is 45min; the pulp after the strengthening de-doping treatment enters the 3# pulp stirring tank, and is adjusted before flotation by adding water, sodium carbonate, soluble carboxymethyl cellulose, sodium sulfite and Z200: first, add water to the inlet of the 3# pulp stirring tank to adjust the mass concentration to 21%, then add 1800g / t of sodium carbonate to adjust the pH value to 9.5, add 2500g / t of soluble carboxymethyl cellulose and 1500g / t of sodium sulfite, and the stirring time is 45min; add Z200 at the overflow port of the 3# pulp stirring tank, and the addition amount is 30g / t;

[0033] (3) flotation of the copper-lead mixed slurry: the slurry obtained in step (2) overflows from the outlet of the 3# slurry stirring tank to become the feed slurry of the copper-lead separation flotation system, and the feed slurry is separated by flotation to obtain copper concentrate foam and lead concentrate slurry;

[0034] In this embodiment, the copper-lead separation flotation system includes two roughing selections, three scavenging selections, and three concentrating selections; the second roughing tailings obtained by the feed slurry after two roughing selections are subjected to three scavenging selections, and the third scavenging tailings obtained are lead concentrate slurry, and the foam products produced by each scavenging selection are returned to the previous selection section in turn to enter the process cycle; the foam products obtained by the feed slurry after the second roughing selection are combined and subjected to three concentrating selections, and the three-concentration foam obtained is copper concentrate foam, and the tailings obtained by each concentrating selection are returned to the next selection section in turn to enter the process cycle;

[0035] Among them, 600g / t of soluble carboxymethyl cellulose and 15g / t of Z200 are added at the entrance of the secondary roughing section, and 5g / t of Z200 is added at the entrance of the secondary scavenging section; 500g / t of soluble carboxymethyl cellulose is added at the entrance of the primary cleaning section, 250g / t of soluble carboxymethyl cellulose is added at the entrance of the secondary cleaning section, and 250g / t of soluble carboxymethyl cellulose is added at the entrance of the tertiary cleaning section;

[0036] (4) Solid-liquid separation to obtain concentrate: copper concentrate foam and lead concentrate slurry are subjected to solid-liquid separation to obtain copper concentrate products and lead concentrate products, respectively. Specifically, copper concentrate foam flows into copper concentrator D by gravity through a pipeline, the bottom flow of copper concentrator D is fed into a copper high-concentration slurry stirring tank and is pumped to copper filter E for filtration through a thickening pump, the overflow water of copper concentrator D and the filtrate water generated by copper filter E are collected and entered into copper return water collection tank F; the filter cake obtained by filtration by copper filter E is discharged into a copper concentrate storage to become a copper concentrate product;

[0037] After the lead concentrate slurry overflows into the lead high-concentration slurry stirring tank, 3000g / t of aluminum sulfate is added to adjust the pH value of the slurry to 7.0, and the slurry flows into the lead concentrator A by gravity through the pipeline. The underflow of the lead concentrator A is fed into the lead high-concentration slurry stirring tank and is sent to the lead filter B for filtration through a dense pump. The overflow water of the lead concentrator A and the filtrate water produced by the lead filter B are collected into the lead return water collection tank C; the filter cake obtained by filtration by the lead filter B is unloaded into the lead concentrate powder warehouse to become a lead concentrate product.

[0038] (5) Recycling of filtrate water: The filtrate water obtained in the solid-liquid separation process in step (4) is collected and recycled to the pre-flotation adjustment process in step (2) for slurry adjustment and the copper concentrate foam transportation process in step (4). Specifically, the overflow water of the copper return water collection tank F and the overflow water of the lead return water collection tank C are both transported to the high-level return water tank G by the return water pump. The effluent of the high-level water tank G is divided into two routes. One route is led to the inlet of the 3# slurry stirring tank, and the mass concentration of the slurry is adjusted to 21% by adding water; the other route is led to the outlet pipe of the tertiary concentrated concentrate to flush the copper concentrate foam into the copper concentrator D.

[0039] Embodiment 2:

[0040] like Figure 1 , 2 An environmentally friendly copper-lead mixed concentrate flotation separation method is shown, comprising the following steps:

[0041] (1) Preparation of copper-lead mixed slurry: The concentrate product obtained after upper flotation of the raw ore containing copper, lead, zinc and silver is the copper-lead mixed slurry;

[0042] (2) Pre-flotation treatment of copper-lead mixed slurry: After the copper-lead mixed slurry obtained in step (1) flows by gravity into the 1# high-concentration stirring tank, activated carbon and sodium sulfide are added to the 1# high-concentration stirring tank for pre-de-drug treatment, the amount of activated carbon is 5 kg / t, the amount of sodium sulfide is 80 g / t, and the pre-de-drug treatment time is 10 min; the slurry after pre-de-drug treatment is transported to a regrinding mill (a 100L sand mill is used in this embodiment) by gravity or pumping for regrinding and de-drug treatment, and the fineness of -200 mesh after regrinding is adjusted to 80%; the slurry after regrinding and de-drug treatment enters the 2# slurry stirring tank for strong Chemical de-doping treatment, the de-doping time is 45min; the pulp after enhanced de-doping treatment enters the 3# pulp stirring tank, and is adjusted before flotation by adding water, sodium carbonate, soluble carboxymethyl cellulose, sodium sulfite and Z200: first, water is added to the inlet of the 3# pulp stirring tank to adjust the pulp concentration to 21%, and then 1800 / t of sodium carbonate is added to adjust the pH value to between 9.5, and 2300g / t of soluble carboxymethyl cellulose and 1200g / t of sodium sulfite are added, and the stirring time is 45min; Z200 is added at the overflow port of the 3# pulp stirring tank, and the addition amount is 25g / t;

[0043] (3) flotation of the copper-lead mixed slurry: the slurry obtained in step (2) overflows from the outlet of the 3# slurry stirring tank to become the feed slurry of the copper-lead separation flotation system, and the feed slurry is separated by flotation to obtain copper concentrate foam and lead concentrate slurry;

[0044] In this embodiment, the copper-lead separation flotation system includes two roughing selections, three scavenging selections, and three concentrating selections; the second roughing tailings obtained by the feed slurry after two roughing selections are subjected to three scavenging selections, and the third scavenging tailings obtained are lead concentrate slurry, and the foam products produced by each scavenging selection are returned to the previous selection section in turn to enter the process cycle; the foam products obtained by the feed slurry after the second roughing selection are combined and subjected to three concentrating selections, and the three-concentration foam obtained is copper concentrate foam, and the tailings obtained by each concentrating selection are returned to the next selection section in turn to enter the process cycle;

[0045] Among them, 800g / t of soluble carboxymethyl cellulose and 10g / t of Z200 are added at the entrance of the secondary roughing section, and 10g / t of Z200 is added at the entrance of the secondary scavenging section; 400g / t of soluble carboxymethyl cellulose is added at the entrance of the primary cleaning section, 200g / t of soluble carboxymethyl cellulose is added at the entrance of the secondary cleaning section, and 200g / t of soluble carboxymethyl cellulose is added at the entrance of the tertiary cleaning section;

[0046] (4) Solid-liquid separation to obtain concentrate: copper concentrate foam and lead concentrate slurry are subjected to solid-liquid separation to obtain copper concentrate products and lead concentrate products, respectively. Specifically, copper concentrate foam flows into copper concentrator D by gravity through a pipeline, the bottom flow of copper concentrator D is fed into a copper high-concentration slurry stirring tank and is pumped to copper filter E for filtration through a thickening pump, the overflow water of copper concentrator D and the filtrate water generated by copper filter E are collected and entered into copper return water collection tank F; the filter cake obtained by filtration by copper filter E is discharged into a copper concentrate storage to become a copper concentrate product;

[0047] After the lead concentrate slurry overflows into the lead high-concentration slurry stirring tank, 2500g / t of aluminum sulfate is added to adjust the slurry pH value to 7.3, and the slurry flows into the lead concentrator A by gravity through the pipeline. The underflow of the lead concentrator A is fed into the lead high-concentration slurry stirring tank and is sent to the lead filter B for filtration through a dense pump. The overflow water of the lead concentrator A and the filtrate water produced by the lead filter B are collected into the lead return water collection tank C; the filter cake obtained by filtration by the lead filter B is unloaded into the lead concentrate powder warehouse to become a lead concentrate product.

[0048] (5) Recycling of filtrate water: The filtrate water obtained in the solid-liquid separation process in step (4) is collected and recycled to the pre-flotation adjustment process in step (2) for slurry adjustment and the copper concentrate foam transportation process in step (4). Specifically, the overflow water of the copper return water collection tank F and the overflow water of the lead return water collection tank C are both transported to the high-level return water tank G by the return water pump. The effluent of the high-level water tank G is divided into two routes. One route is led to the inlet of the 3# slurry stirring tank, and the mass concentration of the slurry is adjusted to 21% by adding water; the other route is led to the outlet pipe of the tertiary concentrated concentrate to flush the copper concentrate foam into the copper concentrator D.

[0049] Embodiment 3:

[0050] like Figure 1 , 2 An environmentally friendly copper-lead mixed concentrate flotation separation method is shown, comprising the following steps:

[0051] (1) Preparation of copper-lead mixed slurry: The concentrate product obtained after upper flotation of the raw ore containing copper, lead, zinc and silver is the copper-lead mixed slurry;

[0052] (2) Pre-flotation treatment of copper-lead mixed slurry: After the copper-lead mixed slurry obtained in step (1) flows by gravity into the 1# high-concentration stirring tank, activated carbon and sodium sulfide are added to the 1# high-concentration stirring tank for pre-de-drug treatment, the amount of activated carbon is 4 kg / t, the amount of sodium sulfide is 70 g / t, and the pre-de-drug treatment time is 10 min; the slurry after pre-de-drug treatment is transported to a regrinding mill (a 100L sand mill is used in this embodiment) by gravity or pumping for regrinding and de-drug treatment, and the fineness of -200 mesh after regrinding is adjusted to 80%; the slurry after regrinding and de-drug treatment enters the 2# slurry stirring tank for strong Chemical de-doping treatment, the de-doping time is 45min; the pulp after enhanced de-doping treatment enters the 3# pulp stirring tank, and is adjusted before flotation by adding water, sodium carbonate, soluble carboxymethyl cellulose, sodium sulfite and Z200: first, water is added to the inlet of the 3# pulp stirring tank to adjust the mass concentration to 21%, and then 2300g / t of sodium carbonate is added to adjust the pH value to between 10, and 2000g / t of soluble carboxymethyl cellulose and 1300g / t of sodium sulfite are added, and the stirring time is 45min; Z200 is added at the overflow port of the 3# pulp stirring tank, and the addition amount is 15g / t;

[0053] (3) flotation of the copper-lead mixed slurry: the slurry obtained in step (2) overflows from the outlet of the 3# slurry stirring tank to become the feed slurry of the copper-lead separation flotation system, and the feed slurry is separated by flotation to obtain copper concentrate foam and lead concentrate slurry;

[0054] In this embodiment, the copper-lead separation flotation system includes two roughing selections, three scavenging selections, and three concentrating selections; the second roughing tailings obtained by the feed slurry after two roughing selections are subjected to three scavenging selections, and the third scavenging tailings obtained are lead concentrate slurry, and the foam products produced by each scavenging selection are returned to the previous selection section in turn to enter the process cycle; the foam products obtained by the feed slurry after the second roughing selection are combined and subjected to three concentrating selections, and the three-concentration foam obtained is copper concentrate foam, and the tailings obtained by each concentrating selection are returned to the next selection section in turn to enter the process cycle;

[0055] Among them, 1000g / t of soluble carboxymethyl cellulose and 10g / t of Z200 are added at the entrance of the secondary roughing section, and 5g / t of Z200 is added at the entrance of the secondary scavenging section; 300g / t of soluble carboxymethyl cellulose is added at the entrance of the primary cleaning section, 200g / t of soluble carboxymethyl cellulose is added at the entrance of the secondary cleaning section, and 150g / t of soluble carboxymethyl cellulose is added at the entrance of the tertiary cleaning section;

[0056] (4) Solid-liquid separation to obtain concentrate: copper concentrate foam and lead concentrate slurry are subjected to solid-liquid separation to obtain copper concentrate products and lead concentrate products, respectively. Specifically, copper concentrate foam flows into copper concentrator D by gravity through a pipeline, the bottom flow of copper concentrator D is fed into a copper high-concentration slurry stirring tank and is pumped to copper filter E for filtration through a thickening pump, the overflow water of copper concentrator D and the filtrate water generated by copper filter E are collected and entered into copper return water collection tank F; the filter cake obtained by filtration by copper filter E is discharged into a copper concentrate storage to become a copper concentrate product;

[0057] After the lead concentrate slurry overflows into the lead high-concentration slurry stirring tank, 2000g / t of aluminum sulfate is added to adjust the pH value of the slurry to 7.5, and the slurry flows into the lead concentrator A by gravity through the pipeline. The underflow of the lead concentrator A is fed into the lead high-concentration slurry stirring tank and is sent to the lead filter B for filtration through a dense pump. The overflow water of the lead concentrator A and the filtrate water produced by the lead filter B are collected into the lead return water collection tank C; the filter cake obtained by filtration by the lead filter B is unloaded into the lead concentrate powder warehouse to become a lead concentrate product.

[0058] (5) Recycling of filtrate water: The filtrate water obtained in the solid-liquid separation process in step (4) is collected and recycled to the pre-flotation adjustment process in step (2) for slurry adjustment and the copper concentrate foam transportation process in step (4). Specifically, the overflow water of the copper return water collection tank F and the overflow water of the lead return water collection tank C are both transported to the high-level return water tank G by the return water pump. The effluent of the high-level water tank G is divided into two routes. One route is led to the inlet of the 3# slurry stirring tank, and the mass concentration of the slurry is adjusted to 21% by adding water; the other route is led to the outlet pipe of the tertiary concentrated concentrate to flush the copper concentrate foam into the copper concentrator D.

[0059] Comparative Example 1:

[0060] The difference between this comparative example and Example 1 is that: (1) after the enhanced de-doping treatment, the slurry enters the 3# slurry stirring tank. First, water is added to the inlet of the 3# slurry stirring tank to adjust the slurry concentration to 21%, and then only 2000 g / t of potassium dichromate is added; only 500 g / t of potassium dichromate is added at the inlet of the secondary roughing section; only 500 g / t of potassium dichromate is added at the inlet of the primary concentration; only 250 g / t of potassium dichromate is added at the inlet of the secondary concentration, and only 250 g / t of potassium dichromate is added at the inlet of the tertiary concentration.

[0061] The various indicators of the copper concentrates obtained by flotation in Examples 1-3 and Comparative Example 1 are compared, as shown in Table 1.

[0062] Table 1 Comparison of various indicators of copper concentrate obtained by flotation using Examples 1-3 and Comparative Example 1

[0063]

[0064]

[0065] From the data in Table 1, it can be clearly seen that the flotation process provided in Examples 1-3 can effectively improve the copper grade and copper recovery rate; at the same time, since the reagents used in the present invention are all environmentally friendly and non-toxic, the reagents are widely available, low in price, and very friendly to environmental protection requirements.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly copper-lead mixed concentrate flotation separation method, comprising the following steps: (1) preparing copper-lead mixed slurry, (2) pre-flotation treatment of the copper-lead mixed slurry, (3) flotation of the copper-lead mixed slurry, and (4) solid-liquid separation to obtain concentrate; wherein, The step (2) pre-flotation treatment of the copper-lead mixed slurry: after the copper-lead mixed slurry obtained in step (1) flows by gravity into the 1# high-concentration stirring tank, activated carbon and sodium sulfide are added to the 1# high-concentration stirring tank for pre-de-drug treatment; the slurry after the pre-de-drug treatment is transported to the regrinding mill by gravity or pumping for regrinding de-drug treatment; the slurry after regrinding de-drug treatment enters the 2# slurry stirring tank for enhanced de-drug treatment; the slurry after enhanced de-drug treatment enters the 3# slurry stirring tank, and is adjusted before flotation by adding water, sodium carbonate, soluble carboxymethyl cellulose, sodium sulfite and Z200; (3) flotation of the copper-lead mixed slurry: the slurry obtained in step (2) overflows from the outlet of the 3# slurry stirring tank to become the feed slurry of the copper-lead separation flotation system, and the feed slurry is separated by flotation to obtain copper concentrate foam and lead concentrate slurry; (4) Solid-liquid separation to obtain concentrate: Copper concentrate foam and lead concentrate slurry are separated by solid-liquid separation to obtain copper concentrate products and lead concentrate products respectively.

2. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1, characterized in that: The method further comprises step (5) recycling of filtrate water: the filtrate water obtained in the solid-liquid separation process in step (4) is collected and recycled to the pre-flotation adjustment process in step (2) for pulping and the copper concentrate foam transportation process in step (4).

3. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1 is characterized in that: In the pre-drug removal process in step (2), the amount of activated carbon used is 4-6 kg / t, the amount of sodium sulfide used is 50-100 g / t, and the pre-drug removal time is 10 min.

4. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1, characterized in that: In the step (2), the fineness of -200 mesh after regrinding in the regrinding mill is adjusted to 80% to 85%.

5. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1, characterized in that: The drug removal time of the enhanced drug removal treatment in step (2) is 45 minutes.

6. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1, characterized in that: In the pre-flotation adjustment process in the step (2), firstly, water is added to the inlet of the 3# ore slurry stirring tank to adjust the slurry concentration to 21%, and then 1800-2300 g / t of sodium carbonate, 2000-2500 g / t of soluble carboxymethyl cellulose and 1000-1500 g / t of sodium sulfite are added, and the stirring time is 45 minutes; Z200 is added at the overflow port of the 3# ore slurry stirring tank, and the addition amount is 10-30 g / t.

7. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 1, characterized in that: The copper-lead separation flotation system in step (3) comprises two roughing selections, three scavenging selections and three concentrating selections; the second roughing tailings obtained by the feed slurry through two roughing selections are subjected to three scavenging selections, and the third scavenging tailings obtained are lead concentrate slurry, and the foam products produced by each scavenging selection are returned to the previous selection section in turn to enter the process cycle; the foam products obtained by the feed slurry through the second roughing selection are combined and subjected to three concentrating selections, and the three-concentrating foam obtained is copper concentrate foam, and the tailings obtained by each concentrating selection are returned to the next selection section in turn to enter the process cycle; Among them, 600-1000g / t of soluble carboxymethyl cellulose and 5-15g / t of Z200 are added at the entrance of the secondary roughing section, and 5-15g / t of Z200 are added at the entrance of the secondary scavenging section; 300-500g / t of soluble carboxymethyl cellulose are added at the entrance of the primary selection, 200-250g / t of soluble carboxymethyl cellulose are added at the entrance of the secondary selection, and 150-250g / t of soluble carboxymethyl cellulose are added at the entrance of the tertiary selection.

8. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 2 is characterized in that: In the step (4), the copper concentrate foam flows into the copper concentrator by gravity through the pipeline, the bottom flow of the copper concentrator is fed into the copper high-concentration slurry stirring tank and pumped to the copper filter for filtration through the thickening pump, the overflow water of the copper concentrator and the filtrate water generated by the copper filter are collected into the copper return water collection tank; the filter cake obtained by filtration by the copper filter is discharged into the copper concentrate warehouse to become the copper concentrate product; After the lead concentrate slurry overflows into the lead high-concentration slurry stirring tank, 2000-3000g / t of aluminum sulfate is added and flows into the lead concentrator through the pipeline. The underflow of the lead concentrator is fed into the lead high-concentration slurry stirring tank and is sent to the lead filter for filtration through a dense pump. The overflow water of the lead concentrator and the filtrate water produced by the lead filter are collected into the lead return water collection pool; the filter cake obtained by filtration in the lead filter is unloaded into the lead concentrate powder warehouse to become a lead concentrate product.

9. The environmentally friendly flotation separation method of copper-lead mixed concentrate according to claim 8, characterized in that: In step (5), the overflow water of the copper backwater collection tank and the overflow water of the lead backwater collection tank are both transported to the high-level backwater tank by the backwater pump, and the effluent of the high-level water tank is divided into two paths, one of which is led to the inlet of the 3# slurry stirring tank, and the mass concentration of the slurry is adjusted to 21% by adding water; the other path is led to the outlet pipe of the tertiary concentrated ore, and is used to flush the copper concentrate foam into the copper concentrator.

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