A lead-zinc ore beneficiation method for improving the recovery rate of valuable metals

Abstract

The application discloses a lead-zinc ore dressing method for improving valuable metal recovery rate, adopts a raw ore magnetic separation-magnetic roughing concentrate regrinding and then separately reselects lead and zinc process, can obtain a lead concentrate with a lead grade of 58.01%, zinc content of 6.71%, silver content of 6826.21 g / t, lead recovery rate of 88.62% and silver recovery rate of 85.15%; a zinc concentrate with a zinc grade of 56.11%, lead content of 0.22%, silver content of 46.97 g / t and zinc recovery rate of 96.24%; an iron concentrate with a yield of 1.18% and an iron grade of 62.55%. The method has the advantages that the lead, zinc and silver recovery rates can be effectively improved, an iron concentrate product with a yield of 1.18% and an iron grade of 62.55% is obtained, the lead, zinc and silver recovery rates are improved and the iron concentrate is recovered, under the condition that the existing process flow is not greatly adjusted and transformed, the valuable metal is effectively recovered, the economic benefit is improved, and the method provides guidance and basis for next process transformation and process debugging.

Description

Technical fields:

[0001] This invention relates to a mineral processing method, and more particularly to a lead-zinc ore processing method for improving the recovery rate of valuable metals. Background technology:

[0002] Our company's Erdaogou mining area, a lead-zinc-silver polymetallic mine, employs open-pit mining and a lead-zinc preferential flotation process for ore beneficiation. Flotation tailings are stored using a dry stacking method. Since January 2021, the beneficiation plant has been processing high-grade (lead + zinc = approximately 9%) ore, but production indicators have been less than ideal, as shown in Table 1.

[0003] Table 1. Results of closed-circuit test of mineral samples from areas A, B, and C using on-site process flow (%)

[0004]

[0005] As shown in Table 1, the lead-zinc preferential flotation process for lead and zinc recovery yields a lead concentrate with a lead grade of 57.52%, a zinc content of 6.65%, a silver content of 6892.31 g / t, a lead recovery rate of 88.18%, and a silver recovery rate of 84.74%; and a zinc concentrate with a zinc grade of 55.71%, a lead content of 0.23%, a silver content of 48.63 g / t, and a zinc recovery rate of 96.11%. The main drawbacks of the current process are poor lead recovery, high lead content in zinc, with valuable lead metal primarily lost in the zinc concentrate, and the inability to effectively recover the iron contained within.

[0006] To reduce the intermingling content of lead and zinc concentrate, improve beneficiation indicators, and comprehensively recover iron, the company conducted a beneficiation test technology study on reducing the intermingling content of lead and zinc concentrate and improving beneficiation indicators in the Erdaogou mining area. The aim was to improve the recovery rate of lead, zinc, and silver, and recover iron concentrate, thereby increasing economic benefits, without making significant adjustments or modifications to the existing process flow. This study provides guidance and a basis for further process modification and debugging. Summary of the Invention:

[0007] To address the aforementioned problems, the present invention aims to provide a lead-zinc ore beneficiation method that improves the recovery rate of valuable metals.

[0008] This invention is implemented by the following technical solution:

[0009] A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation includes the following steps:

[0010] (1) The raw ore is ball-milled and then subjected to magnetic roughing to obtain magnetic roughing concentrate and magnetic roughing tailings; the fineness of ball milling is -200 mesh, accounting for 60%; the process conditions for magnetic roughing are: magnetic field strength of 1500 Oe;

[0011] (2) The magnetic roughing concentrate obtained in step (1) is regrinded and then subjected to lead flotation to obtain lead flotation concentrate and lead flotation tailings;

[0012] (3) The lead flotation concentrate obtained in step (2) is subjected to zinc flotation to obtain zinc flotation concentrate and zinc flotation tailings;

[0013] (4) The zinc flotation concentrate obtained in step (3) is subjected to magnetic separation to obtain iron concentrate and magnetically separated ore;

[0014] (5) Mix the magnetic roughing tailings obtained in step (1) and the lead flotation tailings obtained in step (2) and then perform lead roughing to obtain lead roughing concentrate and lead roughing tailings.

[0015] (6) The lead roughing concentrate obtained in step (5) is regrinded and then subjected to lead beneficiation to obtain lead concentrate;

[0016] (7) The lead roughing tailings obtained in step (5) are subjected to lead scavenging to obtain lead scavenged tailings;

[0017] (8) Combine the lead scavenging tailings obtained in step (7) and the zinc flotation tailings obtained in step (3) and perform zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings;

[0018] (9) The zinc roughing concentrate obtained in step (8) is subjected to zinc refining to obtain zinc concentrate;

[0019] (10) The zinc roughing tailings obtained in step (8) are subjected to zinc scavenging to obtain tailings.

[0020] Furthermore, in step (2), the fineness of the lead roughing concentrate after regrinding is -400 mesh > 90%; the process conditions for lead flotation are: CaO = 15 g / t, butyl xanthate = 1 g / t, MIBC = 50 g / t.

[0021] Furthermore, in step (3), the process conditions for zinc flotation are: CuSO4 = 5 g / t, butyl xanthate = 1 g / t, MIBC = 1 g / t.

[0022] Furthermore, in step (4), the process conditions for magnetic separation are: magnetic field strength of 1000 Oe.

[0023] Furthermore, in step (5), the process conditions for lead roughing are: CaO = 1500 g / t, Na2SO3 = 300 g / t, ZnSO4 = 600 g / t, W-1 = 30 g / t, SN-9 = 40 g / t, LW51 = 4 g / t, MIBC = 50 g / t.

[0024] Furthermore, in step (6), the fineness of the lead roughing concentrate after regrinding is -400 mesh > 90%; the process conditions for lead beneficiation are: CaO = 500 g / t, ZnSO4 = 800 g / t, W-1 = 80 g / t, SN-9 = 10 g / t.

[0025] The lead beneficiation process includes three beneficiation processes. The tailings from the first lead beneficiation process are returned to step (5) to participate in the lead roughing process again. The tailings from the second lead beneficiation process participate in the first lead beneficiation process again. The tailings from the third lead beneficiation process participate in the second lead beneficiation process again. The concentrate from the third lead beneficiation process is the lead concentrate.

[0026] Furthermore, in step (7), the lead scavenging process conditions are: SN-9 = 50 g / t, JR = 6 g / t, MIBC = 10 g / t;

[0027] The lead scavenging includes a secondary scavenging process, in which the lead concentrate from the primary scavenging process is returned to step (5) to participate in the lead roughing process again; and the lead concentrate from the secondary scavenging process participates in the primary lead scavenging process again.

[0028] Furthermore, in step (8), the process conditions for zinc roughing are: CaO = 1500 g / t, LP = 60 g / t, CuSO4 = 500 g / t, LW51 = 20 g / t, JR = 65 g / t, MIBC = 55 g / t;

[0029] The zinc roughing process includes two zinc roughing processes. The concentrates from the first and second zinc roughing processes are combined and then subjected to zinc cleaning.

[0030] Furthermore, in step (9), the zinc selection process conditions are: CaO = 2300 g / t, LP = 120 g / t;

[0031] The zinc beneficiation process includes four beneficiation processes. The tailings from the first zinc beneficiation process are returned to step (8) to participate in the second zinc roughing process. The tailings from the second zinc beneficiation process re-participate in the first zinc beneficiation process. The tailings from the third zinc beneficiation process re-participate in the second zinc beneficiation process. The tailings from the fourth zinc beneficiation process re-participate in the third zinc beneficiation process. The zinc concentrate from the fourth zinc beneficiation process is the zinc concentrate.

[0032] Furthermore, in step (10), the zinc scavenging process conditions are: CuSO4 = 100 g / t, JR = 50 g / t, LW51 = 15 g / t, MIBC = 10 g / t;

[0033] The zinc scavenging includes secondary scavenging. The zinc concentrate from the primary scavenging is returned to step (8) to participate in the secondary zinc roughing. The zinc concentrate from the secondary scavenging participates in the primary zinc scavenging again. The tailings from the secondary zinc scavenging are the tailings.

[0034] Advantages of this invention:

[0035] This invention can effectively improve the recovery rate of lead, zinc, and silver, and simultaneously obtain an iron concentrate product with a yield of 1.18% and an iron grade of 62.55%. It achieves the goal of improving the recovery rate of lead, zinc, and silver and recovering iron concentrate without making major adjustments or modifications to the existing process flow, thereby improving economic benefits. It also provides guidance and basis for the next step of process modification and process debugging. Attached image description:

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a process flow diagram of Example 1;

[0038] Figure 2 This is a process flow diagram of lead roughing in the lead flotation tailings and roughing tailings of Example 1.

[0039] Figure 3 This is a process flow diagram of zinc roughing in zinc flotation tailings and lead scavenging tailings in Example 1;

[0040] Figure 4 This is the process flow diagram for Comparative Example 1. Detailed implementation method:

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1-3 The method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation, as shown, includes the following steps:

[0044] (1) The raw ore is ball-milled and then subjected to magnetic roughing to obtain magnetic roughing concentrate and magnetic roughing tailings; wherein, the fineness of ball milling is -200 mesh, accounting for 60%; the process conditions for magnetic roughing are: magnetic field strength of 1500 Oe;

[0045] The semi-quantitative X-ray fluorescence spectrometry analysis results of the raw ore are shown in Table 2.

[0046] Table 2. Semi-quantitative X-ray fluorescence spectrometry analysis results of the raw ore (%)

[0047]

[0048] The chemical analysis results of the raw ore are shown in Table 3.

[0049] Table 3 Chemical analysis results of the raw ore (%)

[0050]

[0051] As shown in Tables 2 and 3, the main constituent elements of the ore are Zn, O, Si, Ca, S, and Fe, followed by Pb, Na, Mg, Al, and Mn. Valuable elements are mainly Pb, Zn, and Ag, followed by Fe and S; harmful element As was not detected in the spectral analysis; gangue minerals are mainly Si and Ca, with small amounts of Na, Mg, Al, and Mn.

[0052] (2) The magnetic roughing concentrate obtained in step (1) is regrinded and then subjected to lead flotation to obtain lead flotation concentrate and lead flotation tailings; wherein, the fineness of the regrinded lead roughing concentrate is -400 mesh > 90%; the process conditions for lead flotation are: CaO = 15 g / t, butyl xanthate = 1 g / t, MIBC = 50 g / t.

[0053] (3) The lead flotation concentrate obtained in step (2) is subjected to zinc flotation to obtain zinc flotation concentrate and zinc flotation tailings; wherein the process conditions for zinc flotation are: CuSO4 = 5g / t, butyl xanthate = 1g / t, MIBC = 1g / t.

[0054] (4) The zinc flotation concentrate obtained in step (3) is subjected to magnetic separation to obtain iron concentrate and magnetically separated ore; wherein, the process conditions for magnetic separation are: magnetic field strength of 1000 Oe.

[0055] (5) The magnetic roughing tailings obtained in step (1) and the lead flotation tailings obtained in step (2) are mixed and then subjected to lead roughing to obtain lead roughing concentrate and lead roughing tailings; wherein, the process conditions for lead roughing are: CaO=1500g / t, Na2SO3=300g / t, ZnSO4=600g / t, W-1=30g / t, SN-9=40g / t, LW51=4g / t, MIBC=50g / t.

[0056] (6) The lead roughing concentrate obtained in step (5) is regrinded and then subjected to lead beneficiation to obtain lead concentrate; wherein, the fineness of the lead roughing concentrate after regrinding is -400 mesh > 90%; the process conditions for lead beneficiation are: CaO = 500 g / t, ZnSO4 = 800 g / t, W-1 = 80 g / t, SN-9 = 10 g / t;

[0057] Lead beneficiation includes three stages of beneficiation. The tailings from the first beneficiation stage are returned to step (5) to participate in lead roughing again; the tailings from the second beneficiation stage are then re-participated in the first beneficiation stage; the tailings from the third beneficiation stage are then re-participated in the second beneficiation stage; the concentrate from the third beneficiation stage is the lead concentrate.

[0058] The process conditions for a single lead beneficiation process are: CaO = 500 g / t, ZnSO4 = 400 g / t, W-1 = 40 g / t, SN-9 = 10 g / t;

[0059] The process conditions for secondary lead beneficiation are: ZnSO4 = 200 g / t, W-1 = 20 g / t;

[0060] The process conditions for the three-stage lead beneficiation are: ZnSO4 = 200 g / t, W-1 = 20 g / t;

[0061] (7) The lead roughing tailings obtained in step (5) are subjected to lead scavenging to obtain lead scavenged tailings; the process conditions for lead scavenging are: SN-9 = 50 g / t, JR = 6 g / t, MIBC = 10 g / t.

[0062] Lead scavenging includes secondary scavenging. The concentrate from the primary lead scavenging is returned to step (5) to participate in lead roughing again; the concentrate from the secondary lead scavenging participates in the primary lead scavenging again; wherein,

[0063] The process conditions for a single lead scavenging operation are: SN-9 = 30 g / t, JR = 2 g / t, MIBC = 10 g / t;

[0064] The process conditions for secondary lead scavenging are: SN-9 = 20 g / t, JR = 3 g / t;

[0065] (8) The lead scavenging tailings obtained in step (7) and the zinc flotation tailings obtained in step (3) are combined and then subjected to zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings; the process conditions for zinc roughing are: CaO = 1500 g / t, LP = 60 g / t.

[0066] CuSO4=500g / t, LW51=20g / t, JR=65g / t, MIBC=55g / t;

[0067] Zinc roughing involves two zinc roughing processes. The concentrates from the first and second zinc roughing processes are combined and then subjected to zinc cleaning.

[0068] The process conditions for primary zinc roughing are: CaO = 1500 g / t, LP = 30 g / t, CuSO4 = 300 g / t, LW51 = 10 g / t, MIBC = 25 g / t;

[0069] The process conditions for secondary zinc roughing are: LP = 30 g / t, CuSO4 = 200 g / t, LW51 = 10 g / t, JR = 65 g / t, MIBC = 30 g / t;

[0070] (9) The zinc roughing concentrate obtained in step (8) is subjected to zinc beneficiation to obtain zinc concentrate; the process conditions for zinc beneficiation are: CaO = 2300 g / t, LP = 120 g / t;

[0071] Zinc beneficiation includes four stages of beneficiation. The tailings from the first zinc beneficiation stage are returned to step (8) for secondary zinc roughing. The tailings from the second zinc beneficiation stage are then re-participated in the first zinc beneficiation stage. The tailings from the third zinc beneficiation stage are then re-participated in the second zinc beneficiation stage. The tailings from the fourth zinc beneficiation stage are then re-participated in the third zinc beneficiation stage. The concentrate from the fourth zinc beneficiation stage is the zinc concentrate.

[0072] The process conditions for primary zinc beneficiation are: CaO = 1000 g / t, LP = 60 g / t;

[0073] The process conditions for secondary zinc beneficiation are: CaO = 800 g / t, LP = 40 g / t;

[0074] The process conditions for the three-stage zinc beneficiation are: CaO = 500 g / t, LP = 20 g / t;

[0075] (10) The zinc roughing tailings obtained in step (8) are subjected to zinc scavenging to obtain tailings; the process conditions for zinc scavenging are: CuSO4 = 100 g / t, JR = 50 g / t, LW51 = 15 g / t, MIBC = 10 g / t.

[0076] Zinc scavenging includes secondary scavenging. The concentrate from the primary zinc scavenging is returned to step (8) to participate in the secondary zinc roughing, and the concentrate from the secondary zinc scavenging participates again in the primary zinc scavenging. The tailings from the secondary zinc scavenging are the tailings.

[0077] The process conditions for a single zinc scavenging operation are: CuSO4 = 100 g / t, JR = 30 g / t, LW51 = 10 g / t, MIBC = 10 g / t;

[0078] The process conditions for secondary zinc scavenging are: JR = 20 g / t, LW51 = 5 g / t.

[0079] The results of mineral processing using the method of this embodiment are shown in Table 4.

[0080] Table 4. Mineral processing results (%) of this embodiment

[0081]

[0082] As shown in Table 4, the process of using magnetic separation of raw ore, magnetic roughing, and regrinding of the concentrate followed by separate lead-zinc separation yields a lead concentrate with a lead grade of 58.01%, zinc content of 6.71%, silver content of 6826.21 g / t, lead recovery of 88.62%, and silver recovery of 85.15%; a zinc concentrate with a zinc grade of 56.11%, lead content of 0.22%, silver content of 46.97 g / t, and zinc recovery of 96.24%; and an iron concentrate with a yield of 1.18% and an iron grade of 62.55%. Compared with the on-site process flow indicators, this embodiment increases the lead recovery rate by 0.44%, the zinc recovery rate by 0.12%, and the silver recovery rate by 0.41%, while simultaneously obtaining an iron concentrate product with a yield of 1.18% and an iron grade of 62.55%.

[0083] Comparative Example 1:

[0084] The process flow diagram and reagent dosage for this comparative example are as follows: Figure 4 As shown in Table 5, the process of magnetic separation of raw ore, magnetic roughing and regrinding of concentrate, and then incorporating it into the existing main process flow was adopted.

[0085] Table 5. Mineral processing results (%) of Comparative Example 1

[0086]

[0087] Table 5 shows that by using the magnetic separation-magnetic roughing concentrate regrinding method followed by incorporation into the existing main process flow, a lead concentrate with a lead grade of 57.40%, zinc content of 6.81%, silver content of 6772.60 g / t, lead recovery rate of 88.68%, and silver recovery rate of 85.25% can be obtained; a zinc concentrate with a zinc grade of 55.53%, lead content of 0.22%, silver content of 47.40 g / t, and zinc recovery rate of 96.33% can be obtained. Compared with the on-site process flow indicators, the lead recovery rate of this comparative example is increased by 0.50%, the zinc recovery rate is increased by 0.22%, and the silver recovery rate is increased by 0.51%, but this process flow cannot directly obtain iron concentrate products.

[0088] Compared with Example 1, the other mineral processing indicators of this comparative example are all better. However, Example 1 can recover iron contained in the raw ore very well, while Comparative Example 1 cannot recover iron.

[0089] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation, characterized in that, Includes the following steps: (1) The raw ore is ball-milled and then subjected to magnetic roughing to obtain magnetic roughing concentrate and magnetic roughing tailings; the fineness of ball milling is -200 mesh, accounting for 60%; the process conditions for magnetic roughing are: magnetic field strength of 1500 Oe; (2) The magnetic roughing concentrate obtained in step (1) is regrinded and then subjected to lead flotation to obtain lead flotation concentrate and lead flotation tailings; (3) The lead flotation concentrate obtained in step (2) is subjected to zinc flotation to obtain zinc flotation concentrate and zinc flotation tailings; (4) The zinc flotation concentrate obtained in step (3) is subjected to magnetic separation to obtain iron concentrate and magnetically separated ore; (5) Mix the magnetic roughing tailings obtained in step (1) and the lead flotation tailings obtained in step (2) and then perform lead roughing to obtain lead roughing concentrate and lead roughing tailings. (6) The lead roughing concentrate obtained in step (5) is regrinded and then subjected to lead beneficiation to obtain lead concentrate; (7) The lead roughing tailings obtained in step (5) are subjected to lead scavenging to obtain lead scavenged tailings; (8) Combine the lead scavenging tailings obtained in step (7) and the zinc flotation tailings obtained in step (3) and perform zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings; (9) The zinc roughing concentrate obtained in step (8) is subjected to zinc refining to obtain zinc concentrate; (10) The zinc roughing tailings obtained in step (8) are subjected to zinc scavenging to obtain tailings.

2. The lead-zinc ore beneficiation method for improving the recovery rate of valuable metals according to claim 1, characterized in that, In step (2), the fineness of the lead roughing concentrate after regrinding is -400 mesh > 90%; the process conditions for lead flotation are: CaO = 15 g / t, butyl xanthate = 1 g / t, MIBC = 50 g / t.

3. The lead-zinc ore beneficiation method for improving the recovery rate of valuable metals according to claim 1, characterized in that, In step (3), the process conditions for zinc flotation are: CuSO4 = 5 g / t, butyl xanthate = 1 g / t, MIBC = 1 g / t.

4. The lead-zinc ore beneficiation method for improving the recovery rate of valuable metals according to claim 1, characterized in that, In step (4), the process conditions for magnetic separation are: magnetic field strength of 1000 Oe.

5. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 1, characterized in that, In step (5), the process conditions for lead roughing are: CaO = 1500 g / t, Na2SO3 = 300 g / t, ZnSO4 = 600 g / t, W-1 = 30 g / t, SN-9 = 40 g / t, LW51 = 4 g / t, MIBC = 50 g / t.

6. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 1, characterized in that, In step (6), the fineness of the lead roughing concentrate after regrinding is -400 mesh > 90%; the process conditions for lead beneficiation are: CaO = 500 g / t, ZnSO4 = 800 g / t, W-1 = 80 g / t, SN-9 = 10 g / t. The lead beneficiation process includes three beneficiation processes. The tailings from the first lead beneficiation process are returned to step (5) to participate in the lead roughing process again. The tailings from the second lead beneficiation process participate in the first lead beneficiation process again. The tailings from the third lead beneficiation process participate in the second lead beneficiation process again. The concentrate from the third lead beneficiation process is the lead concentrate.

7. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 1, characterized in that, In step (7), the lead scavenging process conditions are: SN-9 = 50 g / t, JR = 6 g / t, MIBC = 10 g / t; The lead scavenging includes a secondary scavenging process, in which the lead concentrate from the primary scavenging process is returned to step (5) to participate in the lead roughing process again; and the lead concentrate from the secondary scavenging process participates in the primary lead scavenging process again.

8. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 1, characterized in that, In step (8), the process conditions for zinc roughing are: CaO = 1500 g / t, LP = 60 g / t, CuSO4 = 500 g / t, LW51 = 20 g / t, JR = 65 g / t, MIBC = 55 g / t; The zinc roughing process includes two zinc roughing processes. The concentrates from the first and second zinc roughing processes are combined and then subjected to zinc cleaning.

9. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 8, characterized in that, In step (9), the zinc selection process conditions are: CaO = 2300 g / t, LP = 120 g / t; The zinc beneficiation process includes four beneficiation processes. The tailings from the first zinc beneficiation process are returned to step (8) to participate in the second zinc roughing process. The tailings from the second zinc beneficiation process re-participate in the first zinc beneficiation process. The tailings from the third zinc beneficiation process re-participate in the second zinc beneficiation process. The tailings from the fourth zinc beneficiation process re-participate in the third zinc beneficiation process. The zinc concentrate from the fourth zinc beneficiation process is the zinc concentrate.

10. A method for improving the recovery rate of valuable metals in lead-zinc ore beneficiation according to claim 8, characterized in that, In step (10), the zinc scavenging process conditions are: CuSO4 = 100 g / t, JR = 50 g / t, LW51 = 15 g / t, MIBC = 10 g / t; The zinc scavenging includes secondary scavenging. The zinc concentrate from the primary scavenging is returned to step (8) to participate in the secondary zinc roughing. The zinc concentrate from the secondary scavenging participates in the primary zinc scavenging again. The tailings from the secondary zinc scavenging are the tailings.

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