Strong magnetic preselection arsenic reduction-flotation method for arsenic-containing copper sulphide ore

Abstract

The invention relates to a strong magnetic preconcentration arsenic reduction-flotation method for arsenic-containing copper sulfide ore, and belongs to the technical field of mineral processing. The method comprises the following steps: vibrating and screening arsenic-containing copper sulphide ore into ore with the particle size of-12mm, returning the ore with the particle size of + 12mm, crushing, and continuously screening; classifying the ore with the particle size of-12mm into ore with the particle size of-0.074 mm by a hydrocyclone, wherein the ore with the particle size of-12mm accounts for 20-80% The overflow is subjected to vertical ring pulsating high-gradient magnetic roughing, and roughing concentrate and roughing tailings are obtained; scavenging the roughing tailings by a vertical ring pulsating high-gradient magnetic separator to obtain scavenged concentrate and scavenged tailings; the roughing concentrate and the scavenging tailings are combined and then are ground until-0.074 mm accounts for 20-80%, and flotation feeding ore is obtained after size mixing; and flotation is conducted on the flotation feed ore, inhibitor lime and PAM are added in the roughing process in flotation, and copper concentrate is obtained after flotation. Compared with the traditional single flotation process, the process flow disclosed by the invention realizes the reduction of tailings and the comprehensive and efficient utilization of resources.

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. 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 ores such as chalcocite, bornite, and covellite, as well as oxidized copper ores such as malachite. During the flotation process, they will dissolve to produce Cu that can activate arsenopyrite. 2+ , which further increases the difficulty of separating arsenopyrite. Therefore, a large amount of reagent costs and environmental restrictions are the main problems that need to be solved urgently in the copper-arsenic separation flotation process. In order to meet the purpose 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 is 2023113274691, a comprehensive and efficient recovery method and equipment system for low-grade chalcopyrite. The invention adds a high-pressure roller mill-strong magnetic pre-selection process and a grinding classification-strong magnetic roughing and tailings discarding process to the front end of the flotation process. The low-grade chalcopyrite is screened, high-pressure roller mill-screening, strong magnetic pre-selection and roughing, and strong magnetic pre-selection sweeping to complete the strong magnetic pre-selection of coarse-grained ore and discard most of the gangue; then it is ground-classified, strong magnetic roughing, and strong magnetic sweeping to complete the strong magnetic roughing of fine-grained ore and discard most of the gangue; in this way, most of the tailings are discarded and used in a high-value manner before the ore enters the mill and floatation, which improves the ore grade of the mill and floatation operations, significantly improves the selectivity of the flotation operation, and greatly reduces the consumption of flotation reagents, simplifies the flotation process, and greatly reduces the production cost of the flotation operation, fully achieving cost reduction, efficiency improvement and green environmental protection. The material processed by the 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 sieved to a particle size of -5mm, and then subjected to strong magnetic pre-selection roughing selection-strong magnetic pre-selection scavenging selection to remove most of the gangue. After classification, it is subjected to strong magnetic roughing selection-strong magnetic scavenging selection to remove most of the gangue again. Finally, it is subjected to roughing selection, two scavenging selections, and two secondary selections in sequence to obtain high-quality

[0004] The material processed by the above method is low-grade chalcopyrite ore. The main purpose of strong magnetic pre-separation roughing or strong magnetic pre-separation scavenging, strong magnetic roughing or strong magnetic separation scavenging is to remove most of the gangue. However, for arsenic-containing copper sulfide mineral materials, chalcopyrite and arsenopyrite are closely coexisting and intermixed with each other. How to remove most of the arsenic-containing minerals (such as arsenopyrite) during the strong magnetic separation process, and how to efficiently float and separate arsenopyrite and chalcopyrite with similar floatability in the subsequent flotation process is a technical problem. Summary of the invention

[0005] In view of the problems and shortcomings of the above-mentioned prior art, the present invention provides a method for strong magnetic pre-selection and arsenic reduction-flotation of arsenic-containing copper sulfide ore. The present invention vibrates and screens the arsenic-containing copper sulfide ore to less than -12 mm, then grinds the particle size to -0.074 mm, accounting for 20-80%, and then removes most of the arsenic-containing minerals (such as arsenopyrite) after strong magnetic roughing and strong magnetic scavenging. Finally, lime + PAM inhibitors are added in the roughing of the flotation process to effectively inhibit the flotation process of arsenopyrite, reduce the amount of flotation reagents used, and achieve the effect of the arsenic content of the copper concentrate being less than 0.5%. The present invention is achieved through the following technical solutions.

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

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

[0008] S2, classify the -12mm ore in S1 into -0.074mm by hydrocyclone, accounting for 20-80% to obtain overflow;

[0009] S3, subjecting the overflow in S2 to vertical ring pulsating high gradient magnetic separation to obtain roughing concentrate and roughing tailings;

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

[0011] S5, combine the rougher concentrate in S3 and the scavenger concentrate in S4, then grind to -0.074mm accounting for 20-80%, and prepare the slurry to obtain the flotation feed ore;

[0012] S6. The ore in S5 is fed into the flotation feed for flotation. In the roughing process of flotation, inhibitor lime + PAM is added to obtain copper concentrate after flotation.

[0013] The S1 arsenic-containing copper sulfide ore contains As≥0.4% and a particle size of 10-15 mm.

[0014] The S3 neutral ring pulsating high gradient magnetic roughing separation is as follows: the ore 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 pulsation impulse frequency is 100-350rpm, and the ore pulp flow rate is 3.0-6.0cm / s.

[0015] The S4 neutral ring pulsating high gradient magnetic separation 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 pulsation impulse is 100-350rpm, and the pulp flow rate is 3.0-6.0cm / s.

[0016] The flotation in S6 is one roughing selection, two cleaning selections and one scavenging selection.

[0017] In the S6, the roughing process inhibitor lime + PAM, and then add 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.

[0018] 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.

[0019] The copper concentrate 1 concentrate is not added with any reagents and enters the copper flotation concentrate 2 operation to obtain copper concentrate and concentrate 2 tailings, and the concentrate 2 tailings are returned to the copper concentrate 1 operation.

[0020] 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.

[0021] 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.

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

[0023] (1) The present invention vibrates and screens the arsenic-containing copper sulfide ore to less than -12 mm, then grinds the particle size to -0.074 mm, accounting for 20-80%, and then removes most of the arsenic-containing minerals (such as arsenopyrite) after strong magnetic roughing and strong magnetic scavenging. Finally, lime + PAM inhibitors are added in the roughing process of the flotation process to effectively inhibit the flotation process of arsenopyrite, reduce the amount of flotation reagents used, and achieve the effect of the arsenic content of the copper concentrate being less than 0.5%.

[0024] (2) Compared with the traditional single flotation process, the present invention can greatly improve the utilization rate of arsenic-containing chalcopyrite resources. After the arsenic-containing copper sulfide ore is crushed, screened, ground and classified, it is subjected to strong magnetic pre-selection and discarding by a vertical ring pulsating high gradient magnetic separator, which removes most of the arsenic-containing minerals, gangue and ore mud, and the copper grade entering the mill is increased by more than 1.3 times, so that low-grade copper ore, arsenic-containing copper ore resources and even surrounding rocks that were previously uneconomically utilized can be economically and effectively utilized, greatly reducing the boundary grade of the ore that can be mined and increasing the amount of mineral resources that can be utilized.

[0025] (3) The present invention can separate most of the chalcopyrite and most of the arsenic-containing minerals (such as arsenopyrite) in one separation. The chalcopyrite content in the magnetic separation tailings is very small, and the copper-arsenic mixed flotation pretreatment process in the flotation stage can be omitted, and the arsenic suppression copper flotation process can be directly adopted to obtain the concentrate product. This makes the process economical, efficient, and green. Before entering the flotation, it discards most of the gangue and ore mud through strong magnetic pre-selection and discarding, and the amount of ore entering the flotation is reduced by more than 25%, which greatly reduces the cost of mineral processing operations, as well as the construction of the tailings pond and the cost of tailings storage management.

[0026] (4) Compared with the traditional single flotation process, the process of the present invention achieves tailings reduction and comprehensive and efficient utilization of resources. The process of early disposal meets the operating concept of "early collection if possible, early disposal if possible", saving a large amount of flotation reagents. However, if the raw ore is directly floated after fine grinding, the flotation tailings are fine in particle size and difficult to be used as building materials. Large-scale tailings ponds need to be built for storage, which is not suitable for efficient resource utilization and green mine construction concepts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic flow diagram of the strong magnetic pre-selection and arsenic reduction-flotation method for arsenic-containing copper sulfide ore of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Example 1

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

[0031] S1. Vibrate and screen the arsenic-containing copper sulfide ore (its specific composition is shown in Table 1 below, with a particle size of 10-15 mm) to -12 mm particle size ore, and return the +12 mm particle size ore for crushing and further screening:

[0032] S2, classify the -12mm ore in S1 into -0.074mm by hydrocyclone, accounting for 20-80% to obtain 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 slurry concentration is controlled to be 20%, the rod medium wire diameter is 1.5mm, the magnetic induction intensity is 0.8T, the pulsation frequency is 100rpm, and the slurry flow rate is 4.0cm / s;

[0034] S4, the roughing tailings in S3 are scavenged by a vertical ring pulsating high gradient magnetic separator to obtain scavenged concentrate and scavenged tailings; wherein the slurry 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 the roughing at 0.2T, the pulsation impulse is 200rpm, and the slurry flow rate is 4cm / s;

[0035] S5, combine the rougher concentrate in S3 and the scavenger concentrate in S4, then grind to -0.074mm accounting for 20-80%, and after slurry adjustment (feed concentration is 20%), obtain the flotation feed;

[0036] S6, feed the ore from S5 to flotation, flotation is one roughing, two cleaning, one scavenging:

[0037] S6.1, feed the flotation ore from S5 for roughing, add lime + PAM as the inhibitor in the roughing process, then add the combined collector ethyl xanthate + Z-200, frother 2 # Oil, after stirring for 8 minutes, enter the copper flotation roughing operation to obtain copper flotation concentrate and rough flotation tailings, wherein the amount of lime added is 2kg / t, the amount of PAM added is 180g / t, the amount of ethyl xanthate + Z-200 added is 200g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), 2 # The amount of oil added is 10g / t;

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

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

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

[0041] The test indicators of this embodiment are shown in Table 1.

[0042] Table 1

[0043]

[0044] Comparative Example 1

[0045] The method for strong magnetic pre-selection and arsenic reduction-flotation of arsenic-containing copper sulfide ore comprises the following steps:

[0046] S1. Vibrate and screen the arsenic-containing copper sulfide ore (its specific composition is shown in Table 1) to -5mm particle size ore, and return the +5mm particle size ore for crushing and further screening:

[0047] S2, classify the -12mm ore in S1 into -0.074mm by hydrocyclone, accounting for 60-80% to obtain overflow;

[0048] 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 slurry concentration is controlled to be 20%, the rod medium wire diameter is 2mm, the magnetic induction intensity is 1.3T, the pulsation frequency is 100rpm, and the slurry flow rate is 4.0cm / s;

[0049] S4, the roughing tailings in S3 are scavenged by a vertical ring pulsating high gradient magnetic separator to obtain scavenged concentrate and scavenged tailings; wherein the slurry concentration is controlled to be 20%, the rod medium wire diameter is 2mm, the magnetic induction intensity is 1.5T, which is slightly higher than the roughing at 0.2T, the pulsation impulse is 200rpm, and the slurry flow rate is 4cm / s;

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

[0051] In this comparative example 1, after rough separation by vertical ring pulsating high gradient magnetic separation and scavenging by vertical ring pulsating high gradient magnetic separator, only 40.01% of arsenic-containing minerals (such as arsenopyrite) were removed, which was significantly higher than the removal rate of 70.94% of arsenic-containing minerals (such as arsenopyrite) 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 requirements of the "Limit Standards for Harmful Elements in Heavy Metal Concentrate Products".

[0052] Comparative Example 2

[0053] In this comparative example 2, except that the inhibitor lime+PAM is not added in step S6.1, the other steps and parameters are consistent with those in example 1.

[0054] In this comparative example 2, the inhibitor lime+PAM is not added, and the arsenic content in the flotation concentrate in this comparative example 2 is 0.97%, which is significantly increased compared with the arsenic content of the flotation concentrate in Example 1, which is 0.18%. The arsenic content of the copper concentrate in this comparative example is higher than 0.5%, and the copper concentrate does not meet the requirements of the "Limit Standards for Harmful Elements in Heavy Metal Concentrate Products".

[0055] Comparative Example 3

[0056] In this comparative example 3, except for adding less inhibitor lime (addition amount is 0.1 kg / t) + PAM (consistent with Example 1, both are 180 g / t) in step S6.1, other steps and parameters are consistent with Example 1.

[0057] A small amount of inhibitor lime is added in this comparative example 3, and the arsenic content in the flotation concentrate in this comparative example 3 is 0.66%, which is significantly increased compared with the arsenic content of the flotation concentrate in Example 1, which is 0.18%. The arsenic content of the copper concentrate in this comparative example is higher than 0.5%, and the copper concentrate does not meet the requirements of the "Limit Standards for Harmful Elements in Heavy Metal Concentrate Products".

[0058] In the existing flotation process, PAM is often used as a flocculant or a sedimentation agent. There is no disclosure that PAM can be used as an inhibitor, especially an arsenic inhibitor. In the present invention, by adding lime and PAM to appropriate concentrations, PAM will become a very effective arsenic inhibitor.

[0059] Example 2

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

[0061] S1. Vibrate and screen the arsenic sulfide copper ore (As0.5% in arsenic sulfide copper ore, particle size 10-15mm) to -12mm particle size ore, and then return the +12mm particle size ore for crushing and further screening:

[0062] S2, classify the -12mm ore in S1 into -0.074mm by hydrocyclone, accounting for 60-80% to obtain overflow;

[0063] 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 slurry concentration is controlled to be 40%, the rod medium wire diameter is 1.8mm, the magnetic induction intensity is 1.2T, the pulsation frequency is 200rpm, and the slurry flow rate is 3.0cm / s;

[0064] S4, the roughing tailings in S3 are scavenged by a vertical ring pulsating high gradient magnetic separator to obtain scavenged concentrate and scavenged tailings; wherein the slurry concentration is controlled to be 40%, the rod medium wire diameter is 3.0mm, the magnetic induction intensity is 1.5T, which is slightly higher than the roughing at 0.3T, the pulsation frequency is 350rpm, and the slurry flow rate is 6.0cm / s;

[0065] S5, combine the rougher concentrate in S3 and the scavenger concentrate in S4, then grind to -0.074mm accounting for 20-80%, and after slurry adjustment (feed concentration is 20%), obtain the flotation feed;

[0066] S6, feed the ore from S5 to flotation, flotation is one roughing, two cleaning, one scavenging:

[0067] S6.1, feed the flotation ore from S5 for roughing, add lime + PAM as the inhibitor in the roughing process, then add the combined collector ethyl xanthate + Z-200, frother 2 # Oil, after stirring for 10 minutes, enter the copper flotation roughing operation to obtain copper flotation concentrate and rough flotation tailings, wherein the amount of lime added is 0.5kg / t, the amount of PAM added is 180g / t, the amount of ethyl xanthate + Z-200 added is 20g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), 2 # The amount of oil added is 10g / t;

[0068] S6.2, the copper flotation concentrate in S6.1 is sent to the copper flotation selection 1 operation without adding any reagents to obtain copper selection 1 concentrate and selection 1 tailings; the selection 1 tailings are returned to the copper roughing operation

[0069] S6.3, the copper concentrate 1 in S6.2 is sent to the copper flotation concentrate 2 operation without adding reagents to obtain copper concentrate and concentrate 2 tailings, and the concentrate 2 tailings are returned to the copper concentrate 1 operation;

[0070] S6.4. Add appropriate amount of ethyl xanthate + Z-200 to the S6.1 rough flotation tailings, enter the copper flotation scavenging operation 1, obtain copper scavenging 1 concentrate and scavenging 1 tailings, and return the copper scavenging 1 concentrate to the copper roughing operation, wherein the amount of ethyl xanthate + Z-200 added (the mass ratio of ethyl xanthate to Z-200 is 1:2) is 30g / t.

[0071] Example 3

[0072] The method for strong magnetic pre-selection and arsenic reduction-flotation of arsenic-containing copper sulfide ore comprises the following steps:

[0073] S1. Vibrate and screen the arsenic sulfide copper ore (As0.6% in arsenic sulfide copper ore, particle size 10-15mm) to -12mm particle size ore, and then return the +12mm particle size ore for crushing and further screening:

[0074] S2, classify the -12mm ore in S1 into -0.074mm by hydrocyclone, accounting for 40-60% to obtain overflow;

[0075] 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 slurry concentration is controlled to be 20%, the rod medium wire diameter is 0.5mm, the magnetic induction intensity is 0.8T, the pulsation frequency is 100rpm, and the slurry flow rate is 6.0cm / s;

[0076] S4, the roughing tailings in S3 are scavenged by a vertical ring pulsating high gradient magnetic separator to obtain scavenged concentrate and scavenged tailings; wherein the slurry 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 the roughing at 0.2T, the pulsation impulse is 100rpm, and the slurry flow rate is 3.0cm / s;

[0077] S5, combine the rougher concentrate in S3 and the scavenger concentrate in S4, then grind to -0.074mm accounting for 20-80%, and after slurry adjustment (feed concentration is 20%), obtain the flotation feed;

[0078] S6, feed the ore from S5 to flotation, flotation is one roughing, two cleaning, one scavenging:

[0079] S6.1, feed the flotation ore from S5 for roughing, add lime + PAM as the inhibitor in the roughing process, then add the combined collector ethyl xanthate + Z-200, frother 2 # Oil, after stirring for 5 minutes, enter the copper flotation roughing operation to obtain copper flotation concentrate and rough flotation tailings, wherein the amount of lime added is 3kg / t, the amount of PAM added is 10g / t, the amount of ethyl xanthate + Z-200 added is 200g / t (the mass ratio of ethyl xanthate to Z-200 is 1:2), 2 # The amount of oil added is 100g / t;

[0080] S6.2, the copper flotation concentrate in S6.1 is sent to the copper flotation selection 1 operation without adding any reagents to obtain copper selection 1 concentrate and selection 1 tailings; the selection 1 tailings are returned to the copper roughing operation

[0081] S6.3, the copper concentrate 1 in S6.2 is sent to the copper flotation concentrate 2 operation without adding reagents to obtain copper concentrate and concentrate 2 tailings, and the concentrate 2 tailings are returned to the copper concentrate 1 operation;

[0082] S6.4. Add appropriate amount of ethyl xanthate + Z-200 to the S6.1 rough flotation tailings, enter the copper flotation scavenging operation 1, obtain copper scavenging 1 concentrate and scavenging 1 tailings, and return the copper scavenging 1 concentrate to the copper roughing operation, wherein the amount of ethyl xanthate + Z-200 added (the mass ratio of ethyl xanthate to Z-200 is 1:2) is 50g / t.

[0083] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for arsenic-containing copper sulfide ore strong magnetic pre-selection and arsenic reduction-flotation, 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 continue screening after crushing: 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, subjecting the rougher tailings in S3 to scavenging 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 to -0.074mm accounting for 20-80%, and obtain the flotation feed after slurry adjustment; S6, feed the ore in S5 to flotation, add inhibitor lime + PAM in the roughing process of flotation, and obtain copper concentrate after flotation.

2. The method for arsenic reduction and flotation of arsenic-containing copper sulfide ore by strong magnetic pre-selection 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 reduction-flotation of arsenic-containing copper sulfide ore by strong magnetic pre-selection according to claim 1, characterized in that: The S3 neutral ring pulsating high gradient magnetic roughing separation is as follows: the ore 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 pulsation impulse frequency is 100-350rpm, and the ore 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 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 pulsation impulse 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 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, the roughing process inhibitor lime + PAM, and then add 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 concentrate is not added with any reagents and enters the copper flotation concentrate 2 operation to obtain copper concentrate and concentrate 2 tailings, and the concentrate 2 tailings are returned to the copper concentrate 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 reduction by strong magnetic pre-selection and flotation of arsenic-containing copper sulfide ore according to any 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.

Images