A strong magnetic pre-selection and arsenic reduction-flotation method for arsenic-containing copper sulfide ore

Abstract

The present application relates to a kind of arsenic-containing copper sulfide ore strong magnetic preselection reduction arsenic-flotation method, belong to mineral processing technical field.Arsenic-containing copper sulfide ore vibrating screen is divided into-12mm particle size ore, +12mm particle size returns crushing and continues to screen :-12mm particle size ore is classified to-0.074mm 20-80% by hydrocyclone, and overflow is obtained;The overflow is carried out vertical ring pulsating high gradient magnetic separation roughing, and roughing concentrate and roughing tailings are obtained;Roughing tailings are carried out vertical ring pulsating high gradient magnetic separator scavenging, and scavenging concentrate and scavenging tailings are obtained;Roughing concentrate and scavenging tailings are combined, then ore grinding is carried out to-0.074mm 20-80%, and pulp is obtained after adjusting, and into floating feed ore is obtained;Into floating feed ore is carried out flotation, and inhibitor lime+PAM is added in roughing process in flotation, and copper concentrate is obtained after flotation.Compared with traditional single flotation process, the present application process realizes tail residue reduction and resource comprehensive efficient utilization.

Description

Technical Field

[0001] The invention relates to a strong magnetic pre-selection and arsenic reduction-flotation method for arsenic-containing copper sulfide ore, belonging to the technical field of mineral processing. Background Art

[0002] Chalcopyrite accounts for 70% of the world's copper reserves and is the main source of copper, and this mineral is mainly derived from copper sulfide ores. Arsenopyrite, as the most common arsenic sulfide mineral, is often mixed into copper concentrate products during the flotation process, causing the arsenic content to exceed the standard. Excessive arsenic in copper concentrate will increase the subsequent smelting costs and convert arsenopyrite into harmful arsenic compounds during the smelting process, which will have a destructive impact on the ecosystem. According to the "Limit Standards for Harmful Elements in Heavy Metal Concentrate Products", the arsenic content of copper concentrate must be less than 0.5%. In production, the flotation separation of chalcopyrite and arsenopyrite is a long-term technical difficulty. The main reason is that they are closely symbiotic and have similar structures, so they have similar floatability. In addition, copper sulfide deposits are often accompanied by secondary sulfide minerals such as chalcocite, bornite, and covellite, as well as copper oxide minerals such as malachite. During the flotation process, they will dissolve to produce Cu that can activate arsenopyrite. 2+ This further increases the difficulty of separating arsenopyrite. Therefore, the high cost of reagents and environmental restrictions are major challenges that need to be urgently addressed in the copper-arsenic flotation process. To meet the goal of green development and reduce the cost of copper-arsenic separation and beneficiation, the method of the present invention is proposed.

[0003] Patent application number 2023113274691, a comprehensive and efficient method and equipment system for the recovery of low-grade chalcopyrite, is filed under patent application number 2023113274691. This invention incorporates a high-pressure roller mill-strong magnetic pre-selection process and a grinding, classification, strong magnetic roughing, and tailings discarding process at the front end of the flotation process. The low-grade chalcopyrite undergoes screening, high-pressure roller mill-screening, strong magnetic pre-selection, and strong magnetic pre-selection scavenging to complete strong magnetic pre-selection of the coarse-grained ore and discard most of the gangue. Further, the ore undergoes grinding, classification, strong magnetic roughing, and strong magnetic scavenging to complete strong magnetic roughing of the fine-grained ore and discard most of the gangue. This method discards most of the tailings before the ore enters the mill and flotation process and allows for high-value utilization. This improves the ore grade before the mill and flotation process, significantly improving the selectivity of the flotation operation while significantly reducing flotation reagent consumption. It also simplifies the flotation process and significantly reduces flotation production costs, fully achieving cost reduction, efficiency improvement, and environmental protection. The material processed by this invention is low-grade chalcopyrite ore with a copper grade of only 0.1%-0.3%. The low-grade chalcopyrite ore contains a large amount of muddy gangue. The ore is screened to a particle size of -5mm, and then subjected to strong magnetic pre-selection roughing selection-strong magnetic pre-selection scavenging selection to discard most of the gangue. After classification, it is subjected to strong magnetic roughing selection-strong magnetic scavenging selection to discard most of the gangue again. Finally, after roughing selection, two scavenging selections, and secondary selection, high-quality chalcopyrite is obtained.

[0004] The material treated by the method is low-grade chalcopyrite ore, and the main purpose of the strong magnetic pre-concentration roughing or the strong magnetic pre-concentration scavenging, the strong magnetic roughing or the strong magnetic roughing scavenging is to remove most of the gangue, but for the arsenic-containing copper sulfide material, chalcopyrite and arsenopyrite are closely associated and interlocked, how to remove most of the arsenic-containing minerals such as arsenopyrite in the strong magnetic separation process, and how to efficiently separate arsenopyrite and chalcopyrite with similar floatability in the subsequent flotation process is a technical problem. SUMMARY

[0005] In view of the problems and deficiencies of the prior art, the present application provides a strong magnetic pre-concentration arsenic reduction-flotation method for arsenic-containing copper sulfide ore. The present application vibrates and screens the arsenic-containing copper sulfide ore to less than-12mm, then grinds the particle size to 20-80% of-0.074mm, then removes most of the arsenic-containing minerals such as arsenopyrite through strong magnetic roughing-strong magnetic scavenging, and finally adds lime+PAM inhibitor in the roughing process of the flotation process to effectively inhibit the flotation process of arsenopyrite, reduce the dosage of flotation reagents, and achieve the effect of reducing the arsenic content of copper concentrate to less than 0.5%. The present application is realized by the following technical scheme.

[0006] A strong magnetic pre-concentration arsenic reduction-flotation method for arsenic-containing copper sulfide ore, comprising the following steps:

[0007] S1, screen the arsenic-containing copper sulfide ore to-12mm particle size ore, and return the+12mm particle size to continue screening after crushing:

[0008] S2, grade the-12mm particle size ore in S1 by a hydrocyclone to obtain an overflow with-0.074mm accounting for 20-80%;

[0009] S3, perform roughing by a vertical ring pulsating high gradient magnetic separator on the overflow in S2 to obtain roughing concentrate and roughing tailings;

[0010] S4, perform scavenging by a vertical ring pulsating high gradient magnetic separator on the roughing tailings in S3 to obtain scavenging concentrate and scavenging tailings;

[0011] S5, combine the roughing concentrate in S3 and the scavenging concentrate in S4, then grind the ore to-0.074mm accounting for 20-80%, and obtain a flotation feed after slurry preparation;

[0012] S6, perform flotation on the flotation feed in S5, and add inhibitors lime+PAM in the roughing process of the flotation to obtain copper concentrate after the flotation.

[0013] The As in the arsenic-containing copper sulfide ore in S1 is greater than or equal to 0.4%, and the particle size is 10-15mm.

[0014] The S3 neutral ring pulsating high gradient magnetic roughing is: the pulp concentration is controlled to be 20-40%, the rod medium wire diameter is 0.5-1.8 mm, the magnetic induction intensity is 0.8-1.2 T, the pulsating frequency is 100-350 rpm, and the pulp flow rate is 3.0-6.0 cm / s.

[0015] The S4 neutral ring pulsating high gradient magnetic scavenging is: the pulp concentration is controlled to be 20-40%, the rod medium wire diameter is 2.2-3.0 mm, the magnetic induction intensity is 1.0-1.5 T, the roughing is slightly higher by 0.2-0.3 T, the pulsating frequency is 100-350 rpm, and the pulp flow rate is 3.0-6.0 cm / s.

[0016] The S6 copper flotation is one roughing, two cleaning and one scavenging.

[0017] The S6 copper flotation roughing process inhibitor is lime + PAM, and then combined collector ethyl xanthate + Z-200 and frother 2 # Oil is added, stirred for 5-10 min, and then enters the copper flotation roughing operation to obtain copper flotation concentrate and roughing tailings.

[0018] The S6 copper flotation concentrate enters the copper flotation cleaning 1 operation without adding any reagent to obtain copper cleaning 1 concentrate and cleaning 1 tailings, and the cleaning 1 tailings returns to the copper roughing operation.

[0019] The copper cleaning 1 concentrate enters the copper flotation cleaning 2 operation without adding any reagent to obtain copper concentrate and cleaning 2 tailings, and the cleaning 2 tailings returns to the copper cleaning 1 operation.

[0020] The roughing tailings add appropriate ethyl xanthate + Z-200 and enter the copper flotation scavenging 1 operation to obtain copper scavenging 1 concentrate and scavenging 1 tailings, and the copper scavenging 1 concentrate returns to the copper roughing operation.

[0021] The lime addition amount is 0.5-3 kg / t, the PAM addition amount is 10-200 g / t, the ethyl xanthate + Z-200 addition amount is 20-200 g / t, and the 2 # Oil addition amount is 10-100 g / t.

[0022] The beneficial effects of the present application are:

[0023] (1) The present application vibrates the sieve containing arsenic copper sulfide to below-12 mm, and then grinds the particle size to 20-80% below-0.074 mm, and then removes most of the arsenic-containing minerals (such as arsenopyrite) through strong magnetic roughing and strong magnetic scavenging, and finally adds lime + PAM inhibitor in the roughing process of the flotation process, effectively inhibits the flotation process of arsenopyrite, reduces the flotation reagent dosage, and realizes the effect that the arsenic content of the copper concentrate is lower than 0.5%.

[0024] (2) Compared with the traditional single flotation process, the arsenic-containing copper sulfide ore resource utilization rate can be greatly improved. After ore crushing-screening-grinding-classification, the strong magnetic pre-selection is carried out by the vertical ring pulse high gradient magnetic separator, most of the arsenic-containing minerals, gangue and slurry are discarded, the copper grade is increased by more than 1.3 times, the low-grade copper ore, arsenic-containing copper ore resources and even surrounding rock which cannot be economically utilized before can be economically and effectively utilized, the boundary grade of the exploitable ore is greatly reduced, and the amount of the utilizable mineral resources is increased.

[0025] (3) The vast majority of chalcopyrite and most of the arsenic-containing minerals (such as arsenopyrite) can be separated out by one separation, and the content of chalcopyrite in the tailings of magnetic separation is very small, so the copper-arsenic mixed flotation pretreatment process in the flotation stage can be omitted, and the concentrate product can be directly obtained by adopting the arsenic-inhibiting copper flotation process. This makes the process flow economical and efficient, green and environmentally friendly. Before entering the flotation, most of the gangue and slurry are discarded through the strong magnetic pre-selection, the amount of the ore entering the flotation is reduced by more than 25%, and the beneficiation operation cost, as well as the construction and management cost of the tailings pond are greatly reduced.

[0026] (4) Compared with the traditional single flotation process, the process flow of the present application realizes tailings reduction and comprehensive and efficient utilization of resources. The early discarding process meets the operation concept of “early collection and early discarding”, and a large amount of flotation reagent is saved. However, the direct flotation after fine grinding of the raw ore has a fine tailings size, which is difficult to be used as building materials, and a large-scale tailings pond needs to be built for storage, which is not suitable for the concept of resource efficient utilization and green mine construction. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a strong magnetic pre-selection arsenic reduction-flotation method flowchart of the arsenic-containing copper sulfide ore of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described below in combination with the drawings and specific embodiments.

[0029] Example 1

[0030] The arsenic-containing copper sulfide ore strong magnetic pre-selection arsenic reduction-flotation method includes the following steps:

[0031] S1, the arsenic-containing copper sulfide ore (the specific components are shown in Table 1 below, and the particle size is 10-15 mm) is vibrated and screened to-12 mm particle size ore, and the +12 mm particle size is returned to the crushing for continuous screening:

[0032] S2, the-12 mm particle size ore in S1 is classified by a hydrocyclone to-0.074 mm accounting for 20-80% to obtain the overflow;

[0033] S3, the overflow in S2 is subjected to vertical ring pulsating high gradient magnetic separation roughing to obtain roughing concentrate and roughing tailings; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 1.5 mm, the magnetic induction intensity is 0.8 T, the pulsating stroke frequency is 100 rpm, and the pulp flow rate is 4.0 cm / s;

[0034] S4, the roughing tailings in S3 are subjected to vertical ring pulsating high gradient magnetic separation scavenging to obtain scavenging concentrate and scavenging tailings; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 2.2 mm, the magnetic induction intensity is 1.0 T, which is slightly higher than that of roughing by 0.2 T, the pulsating stroke frequency is 200 rpm, and the pulp flow rate is 4 cm / s;

[0035] S5, the roughing concentrate in S3 and the scavenging concentrate in S4 are combined, and then the ore is ground to 20-80% of -0.074 mm, and the pulp is prepared (the ore concentration is 20%) to obtain the flotation feed ore;

[0036] S6, the flotation feed ore in S5 is subjected to flotation, which is one roughing, two cleaning and one scavenging;

[0037] S6.1, the flotation feed ore in S5 is subjected to roughing, the depressant is lime + PAM, then the combined collector ethyl xanthate + Z-200 and the frother 2 # oil are added, after stirring for 8 min, the copper flotation roughing is carried out to obtain copper flotation concentrate and roughing tailings, wherein the lime addition amount is 2 kg / t, the PAM addition amount is 180 g / t, the ethyl xanthate + Z-200 addition amount is 200 g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), and the 2 # oil addition amount is 10 g / t;

[0038] S6.2, the copper flotation concentrate in S6.1 is subjected to copper flotation cleaning 1 without adding any reagent to obtain copper cleaning 1 concentrate and cleaning 1 tailings; the cleaning 1 tailings are returned to the copper roughing operation

[0039] S6.3, the copper cleaning 1 concentrate in S6.2 is subjected to copper flotation cleaning 2 without adding reagent to obtain copper concentrate and cleaning 2 tailings, and the cleaning 2 tailings are returned to the copper cleaning 1 operation;

[0040] S6.4, the roughing tailings in S6.1 are added with an appropriate amount of ethyl xanthate + Z-200 to enter the copper flotation scavenging 1 operation to obtain copper scavenging 1 concentrate and scavenging 1 tailings, and the copper scavenging 1 concentrate is returned to the copper roughing operation, wherein the ethyl xanthate + Z-200 addition amount (the mass ratio of ethyl xanthate to Z-200 is 1:2) is 40 g / t.

[0041] The test indexes of the embodiment are shown in Table 1.

[0042] Table 1

[0043]

[0044] Comparative Example 1

[0045] The arsenic-containing copper sulfide ore strong magnetic pre-concentration arsenic removal-flotation method includes the following steps:

[0046] S1, the arsenic-containing copper sulfide ore (its specific components are shown in Table 1) is sieved by a vibrating screen to a -5 mm particle size ore, and the +5 mm particle size is returned to continue sieving after crushing:

[0047] S2, the -12 mm particle size ore in S1 is classified by a hydrocyclone to obtain an overflow with -0.074 mm accounting for 60-80%;

[0048] S3, the overflow in S2 is subjected to vertical ring pulsating high gradient magnetic separation roughing to obtain a roughing concentrate and a roughing tailing; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 2 mm, the magnetic induction intensity is 1.3 T, the pulsating pulse frequency is 100 rpm, and the pulp flow rate is 4.0 cm / s;

[0049] S4, the roughing tailing in S3 is subjected to vertical ring pulsating high gradient magnetic separator scavenging to obtain a scavenging concentrate and a scavenging tailing; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 2 mm, the magnetic induction intensity is 1.5 T, which is 0.2 T higher than that of the roughing, the pulsating pulse frequency is 200 rpm, and the pulp flow rate is 4 cm / s;

[0050] The other steps and parameters are consistent with those of Example 1.

[0051] In this comparative example 1, only 40.01% of the arsenic-containing minerals (such as arsenopyrite) are removed after the vertical ring pulsating high gradient magnetic separation roughing and the vertical ring pulsating high gradient magnetic separator scavenging, which is significantly higher than the 70.94% of the arsenic-containing minerals (such as arsenopyrite) removed in Example 1. The arsenic content of the copper concentrate in this comparative example is higher than 0.5%, and the copper concentrate does not meet the “Limit Standard for Harmful Elements in Heavy Metal Concentrate Products”.

[0052] Comparative Example 2

[0053] In this comparative example 2, the other steps and parameters are consistent with those of Example 1, except that no inhibitor lime+PAM is added in step S6.1.

[0054] In this comparative example 2, no inhibitor lime+PAM is added, and the arsenic content of the flotation concentrate in this comparative example 2 is 0.97%, which is significantly increased compared with the arsenic content of 0.18% of the flotation concentrate in Example 1. The arsenic content of the copper concentrate in this comparative example is higher than 0.5%, and the copper concentrate does not meet the “Limit Standard for Harmful Elements in Heavy Metal Concentrate Products”.

[0055] Comparative Example 3

[0056] In this comparative example 3, less inhibitor lime (0.1 kg / t) and PAM (180 g / t) were added in step S6.1, and other steps and parameters were consistent with example 1.

[0057] In this comparative example 3, less inhibitor lime was added, and the arsenic content in the flotation concentrate was 0.66%, which was significantly higher than the arsenic content of 0.18% in the flotation concentrate in example 1. The arsenic content of the copper concentrate in this comparative example was higher than 0.5%, and the copper concentrate did not meet the "Limitation Standard of Harmful Elements in Heavy Metal Concentrate Products".

[0058] PAM is often used as a flocculating agent or a settling agent in existing flotation processes, and there is no disclosure that PAM can be used as an inhibitor, especially an arsenic inhibitor. In the present application, by adding lime and PAM at appropriate concentrations, PAM will become a very effective arsenic inhibitor.

[0059] Example 2

[0060] The method for reducing arsenic by strong magnetic pre-selection and flotation of arsenic-containing copper sulfide ore includes the following steps:

[0061] S1, the arsenic-containing copper sulfide ore (As content in the arsenic-containing copper sulfide ore is 0.5%, and the particle size is 10-15 mm) is sieved by a vibrating screen to obtain -12 mm particle size ore, and +12 mm particle size ore is returned to continue sieving after crushing:

[0062] S2, the -12 mm particle size ore in S1 is classified by a hydrocyclone to obtain an overflow with -0.074 mm accounting for 60-80%;

[0063] S3, the overflow in S2 is subjected to rough selection by a vertical ring pulsating high gradient magnetic separator to obtain rough selection concentrate and rough selection tailings; wherein the pulp concentration is controlled to be 40%, the rod medium wire diameter is 1.8 mm, the magnetic induction intensity is 1.2 T, the pulsating pulse frequency is 200 rpm, and the pulp flow rate is 3.0 cm / s;

[0064] S4, the rough selection tailings in S3 are subjected to scavenging by a vertical ring pulsating high gradient magnetic separator to obtain scavenging concentrate and scavenging tailings; wherein the pulp concentration is controlled to be 40%, the rod medium wire diameter is 3.0 mm, the magnetic induction intensity is 1.5 T, which is 0.3 T higher than that of the rough selection, the pulsating pulse frequency is 350 rpm, and the pulp flow rate is 6.0 cm / s;

[0065] S5, the rough selection concentrate in S3 and the scavenging concentrate in S4 are combined, and then the combined concentrate is ground to -0.074 mm accounting for 20-80%, and the pulp is adjusted (the feed concentration is 20%) to obtain the feed for flotation;

[0066] S6, the flotation of the feed into S5 is carried out, and the flotation is one roughing, two cleanings and one scavenging:

[0067] S6.1, the roughing of the feed into S5 is carried out, and the roughing process uses the depressant lime + PAM, and then the combined collector ethyl xanthate + Z-200 and the frother 2 are added; # oil, after stirring for 10 min, the copper flotation roughing is carried out, and the copper flotation concentrate and the roughing tailings are obtained, wherein the addition amount of lime is 0.5 kg / t, the addition amount of PAM is 180 g / t, the addition amount of ethyl xanthate + Z-200 is 20 g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), and the addition amount of 2 # oil is 10 g / t;

[0068] S6.2, the copper flotation concentrate in S6.1 is subjected to the copper flotation cleaning 1 without adding any reagent, and the copper cleaning 1 concentrate and the cleaning 1 tailings are obtained; the cleaning 1 tailings are returned to the copper roughing operation

[0069] S6.3, the copper cleaning 1 concentrate in S6.2 is subjected to the copper flotation cleaning 2 without adding any reagent, and the copper concentrate and the cleaning 2 tailings are obtained, and the cleaning 2 tailings are returned to the copper cleaning 1 operation;

[0070] S6.4, the roughing tailings in S6.1 are subjected to the copper flotation scavenging 1 by adding an appropriate amount of ethyl xanthate + Z-200, and the copper scavenging 1 concentrate and the scavenging 1 tailings are obtained, and the copper scavenging 1 concentrate is returned to the copper roughing operation, wherein the addition amount of ethyl xanthate + Z-200 (the mass ratio of ethyl xanthate to Z-200 is 1:2) is 30 g / t.

[0071] Example 3

[0072] The method for reducing arsenic by strong magnetic pre-separation and flotation of the arsenic-containing copper sulfide ore, and the steps thereof, include:

[0073] S1, the arsenic-containing copper sulfide ore (As0.6% in the arsenic-containing copper sulfide ore, and the particle size is 10-15 mm) is sieved by a vibrating screen to obtain the ore with a particle size of-12 mm, and the ore with a particle size of +12 mm is returned to the crushing operation and then sieved again:

[0074] S2, the ore with a particle size of-12 mm in S1 is classified by a hydrocyclone to obtain an overflow with 40-60% of-0.074 mm;

[0075] S3, the overflow in S2 is subjected to the roughing of the vertical ring pulsating high gradient magnetic separation, and the roughing concentrate and the roughing tailings are obtained; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 0.5 mm, the magnetic induction intensity is 0.8 T, the pulsating pulse frequency is 100 rpm, and the pulp flow rate is 6.0 cm / s;

[0076] S4, the tailings of the rough separation in S3 are subjected to a standing ring pulsating high gradient magnetic separator for scavenging to obtain a scavenging concentrate and a scavenging tailings; wherein the pulp concentration is controlled to be 20%, the rod medium wire diameter is 2.2mm, the magnetic induction intensity is 1.0T, which is slightly higher than that of the rough separation by 0.2T, the pulsating pulse frequency is 100rpm, and the pulp flow rate is 3.0cm / s;

[0077] S5, the rough separation concentrate in S3 and the scavenging concentrate in S4 are combined, and then the ore is ground to 20-80% of -0.074mm, and the pulp is adjusted (the feed concentration is 20%) to obtain a flotation feed;

[0078] S6, the flotation feed in S5 is subjected to flotation, which is one rough separation, two cleaning separations and one scavenging separation:

[0079] S6.1, the flotation feed in S5 is subjected to rough separation, the depressant is lime+PAM, then the combined collector ethyl xanthate+Z-200 and the frother 2 # oil are added, after stirring for 5min, the copper flotation rough separation is carried out to obtain a copper flotation concentrate and a rough flotation tailings, wherein the lime addition amount is 3kg / t, the PAM addition amount is 10g / t, the ethyl xanthate+Z-200 addition amount is 200g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), and the 2 # oil addition amount is 100g / t;

[0080] S6.2, the copper flotation concentrate in S6.1 is subjected to copper flotation cleaning 1 without adding any reagent to obtain a copper cleaning 1 concentrate and a cleaning 1 tailings, and the cleaning 1 tailings are returned to the copper rough separation operation

[0081] S6.3, the copper cleaning 1 concentrate in S6.2 is subjected to copper flotation cleaning 2 without adding any reagent to obtain a copper concentrate and a cleaning 2 tailings, and the cleaning 2 tailings are returned to the copper cleaning 1 operation;

[0082] S6.4, the rough flotation tailings in S6.1 are added with an appropriate amount of ethyl xanthate+Z-200 to enter the copper flotation scavenging 1 operation to obtain a copper scavenging 1 concentrate and a scavenging 1 tailings, and the copper scavenging 1 concentrate is returned to the copper rough separation operation, wherein the ethyl xanthate+Z-200 addition amount (the mass ratio of ethyl xanthate to Z-200 is 1:2) is 50g / t.

[0083] The specific embodiments of the application are described in detail in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation method, characterized in that The steps include: S1. Vibrate and screen the arsenic-containing copper sulfide ore to -12mm particle size, and then return the +12mm particle size to be crushed and screened further: S2, classify the -12mm particle size ore in S1 into -0.074mm by hydrocyclone, accounting for 20-80% to obtain overflow; S3, subjecting the overflow in S2 to vertical ring pulsating high gradient magnetic separation to obtain roughing concentrate and roughing tailings; S4, the rougher tailings in S3 are subjected to scavenging separation by a vertical ring pulsating high gradient magnetic separator to obtain scavenging concentrate and scavenging tailings; S5, combine the rougher concentrate in S3 and the scavenger concentrate in S4, then grind them to -0.074mm, accounting for 20-80%, and prepare the slurry to obtain the flotation feed; S6: The ore in S5 is fed into the flotation system for flotation. In the roughing process of flotation, inhibitors such as lime and PAM are added. After flotation, copper concentrate is obtained.

2. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 1, characterized in that: The S1 arsenic-containing copper sulfide ore contains As≥0.4% and a particle size of 10-15 mm.

3. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 1, characterized in that: The S3 neutral ring pulsating high gradient magnetic roughing separation is as follows: the pulp concentration is controlled at 20-40%, the rod medium wire diameter is 0.5-1.8mm, the magnetic induction intensity is 0.8-1.2T, the pulsating impulse frequency is 100-350rpm, and the pulp flow rate is 3.0-6.0cm / s.

4. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 1, characterized in that: The S4 neutral ring pulsating high gradient magnetic separation sweeping process is as follows: the pulp concentration is controlled at 20-40%, the rod medium wire diameter is 2.2-3.0mm, the magnetic induction intensity is 1.0-1.5T, which is slightly higher than the roughing at 0.2-0.3T, the pulsating impulse frequency is 100-350rpm, and the pulp flow rate is 3.0-6.0cm / s.

5. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 1, characterized in that: The flotation in S6 is composed of one roughing selection, two cleaning selections and one scavenging selection.

6. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 5, characterized in that: In the S6 roughing process, the inhibitor lime + PAM is added, and then the combined collector ethyl xanthate + Z-200, foaming agent 2 # Oil, after stirring for 5-10 minutes, enters the copper flotation roughing operation to obtain copper flotation concentrate and rough flotation tailings.

7. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 6, characterized in that: The copper flotation concentrate in S6 enters the copper flotation concentration 1 operation without adding any reagents to obtain copper concentration 1 concentrate and concentration 1 tailings; the concentration 1 tailings are returned to the copper roughing operation.

8. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 7, characterized in that: The copper concentrate 1 is not added with any reagents and enters the copper flotation and concentration 2 operation to obtain copper concentrate and concentration 2 tailings, and the concentration 2 tailings are returned to the copper concentration 1 operation.

9. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to claim 6, characterized in that: The rough flotation tailings are added with an appropriate amount of ethyl xanthate + Z-200 and enter the copper flotation scavenging operation 1 to obtain copper scavenging 1 concentrate and scavenging 1 tailings, and the copper scavenging 1 concentrate is returned to the copper roughing operation.

10. The method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation according to any one of claims 6 and 9, characterized in that: The amount of lime added is 0.5-3kg / t, the amount of PAM added is 10-200g / t, the amount of ethyl xanthate + Z-200 added is 20-200g / t, # The amount of oil added is 10-100g / t.

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