Process for low-alkalinity flotation separation of stibnite and arsenopyrite

Abstract

According to the technology for separating stibnite and arsenopyrite through low-alkalinity flotation, in the antimony roughing flotation and fine selection process, modified polyacrylamide is added to replace part of lime, Pb (NO3) 2 serves as an activating agent, the modified polyacrylamide and the lime serve as an inhibitor together, so that the adding amount of the lime is reduced, upward floating of arsenic in ore is inhibited, and the arsenic content in the ore is reduced; and the flotation alkalinity is reduced, so that the floating of arsenic in the antimony-arsenic minerals is inhibited under the low-alkalinity condition. Test results show that in the antimony roughing flotation and concentration process, compared with only using lime as an inhibitor, under the combined action of modified polyacrylamide, lime and Pb (NO3) 2, the lime dosage and alkalinity in the antimony roughing flotation and concentration process are effectively reduced, the recovery rate of antimony is not affected, and the phenomenon that ore froth is sticky is improved. In addition, the modified polyacrylamide has little pollution to the environment and is more environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of resources and environment, and in particular to a process for flotation separation of stibnite and arsenopyrite with low alkalinity. Background Art

[0002] For low-grade, arsenic-rich antimony-arsenic sulfide ores, mixed flotation is often used to prioritize arsenic. Mixed flotation involves direct flotation separation of antimony and arsenic, and pyrometallurgical smelting of mixed concentrate to produce antimony trioxide, followed by reduction smelting to produce crude antimony. Because stibnite is more floatable than arsenic minerals, direct flotation separation of antimony and arsenic is often used to suppress arsenic flotation. However, high alkalinity in antimony-arsenic separation not only affects antimony flotation, creates sticky flotation froth that affects concentrate quality, and leads to pipe fouling and clogging, impacting operational operations, but also increases the difficulty and cost of subsequent tailings wastewater treatment. Summary of the Invention

[0003] In response to the above-mentioned problems existing in the prior art, the present invention provides a process for flotation separation of stibnite and arsenopyrite by low alkalinity. When the ore containing stibnite and arsenopyrite is subjected to antimony roughing flotation and fine flotation, modified polyacrylamide is added to replace part of the lime. The modified polyacrylamide and lime together act as inhibitors to reduce the amount of lime added, thereby reducing the flotation alkalinity, thereby inhibiting the flotation of arsenic in antimony-arsenic minerals under low alkalinity conditions, and at the same time achieving low-alkalinity separation of antimony and arsenic minerals and reducing the stickiness of the ore foam.

[0004] The specific content of the invention is as follows: The present invention provides a process for flotation separation of stibnite and arsenopyrite with low basicity, the method comprising the following steps: S1. After grinding the antimony-arsenic mixed concentrate, lime is added to adjust the pH value to weak alkalinity, and then an appropriate amount of Pb(NO3)2, modified polyacrylamide and a collector are added to perform antimony roughing flotation to obtain antimony rough concentrate and roughing tailings; based on each ton of ore, the amount of lime added is 500-2000 g / t; the amount of modified polyacrylamide added is 100-400 g / t; and the amount of Pb(NO3)2 added is 100-800 g / t; S2, adding lime, Pb(NO3)2 and a collector to the roughing tailings, performing multiple scavenging to obtain a high-arsenic product; wherein the amount of lime added is 100-2000 g / t; the amount of Pb(NO3)2 added is 50-800 g / t; S3, adding lime to the antimony crude concentrate to adjust the pH to weak alkalinity, then adding appropriate amounts of Pb(NO3)2, modified polyacrylamide and a collector, and performing multiple concentrations to obtain antimony concentrate; based on each ton of ore, the amount of lime added is 200-2000 g / t; the amount of modified polyacrylamide added is 10-100 g / t; and the amount of Pb(NO3)2 added is 20-300 g / t; The modified polyacrylamide is a mixture of sulfonic acid polyacrylamide and hydroxy polyacrylamide; the mass ratio of the sulfonic acid polyacrylamide to the hydroxy polyacrylamide is 1:1 to 1:10.

[0005] Optionally, in step S1, an appropriate amount of potassium permanganate is further added during the antimony roughing flotation process; Calculated per ton of ore, the amount of potassium permanganate added is 50-500 g / t.

[0006] Optionally, in step S3, an appropriate amount of potassium permanganate is further added during the beneficiation process to obtain the antimony concentrate; Calculated per ton of ore, the amount of potassium permanganate added is 50-500 g / t.

[0007] Optionally, in step S1, the grinding fineness is -200 mesh 55% to -400 mesh 90%.

[0008] Optionally, in step S1, the antimony roughing flotation is performed 1 to 2 times; and the time for each antimony roughing flotation is 3 to 9 minutes.

[0009] Optionally, in step S1, based on per ton of ore, the amount of lime added is 1000-2000 g / t; the amount of modified polyacrylamide added is 200-300 g / t; and the amount of Pb(NO3)2 added is 400-500 g / t; In step S2, the amount of lime added is 500-1000 g / t per ton of ore; the amount of Pb(NO3)2 added is 100-200 g / t; In step S3, the amount of lime added is 500~2000 g / t; the amount of modified polyacrylamide added is 12~50 g / t; and the amount of Pb(NO3)2 added is 40~200 g / t.

[0010] Optionally, in step S2, the number of scanning is 1 to 5 times; and the time for each scanning is 4 to 5 minutes.

[0011] Optionally, in step S3, the number of selections is 1 to 6 times; and the time for each selection is 2 to 6 minutes.

[0012] Optionally, the collector is at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium chloride.

[0013] Optionally, the added amount of the collector is 10~50 g / t.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention provides a process for flotation separation of stibnite and arsenopyrite with low alkalinity, comprising: grinding the antimony-arsenic mixed concentrate, adding lime to adjust the pH value to weak alkalinity, then adding an appropriate amount of Pb(NO3)2, modified polyacrylamide and an antimony collector, and performing antimony roughing flotation to obtain an antimony rough concentrate and a roughing tailing; adding inhibitor lime and Pb(NO3)2 to the roughing tailings and performing multiple scavenging to obtain a high-arsenic product; adding lime to the antimony rough concentrate to adjust the pH value to weak alkalinity, then adding an appropriate amount of Pb(NO3)2, modified polyacrylamide and an antimony collector, and performing multiple cleaning to obtain an antimony concentrate.

[0015] The low-alkalinity flotation separation process provided by the present invention uses modified polyacrylamide to replace some lime during the antimony roughing flotation and concentrating processes. Pb(NO3)2 acts as an activator, and the modified polyacrylamide and lime act together as depressants to reduce the amount of lime added, thereby suppressing the flotation of arsenic in the ore. This reduces the flotation alkalinity, thereby suppressing the flotation of arsenic in antimony-arsenic minerals under low-alkalinity conditions. Experimental results show that, compared with using only lime as a depressant, the combined action of modified polyacrylamide, lime, and Pb(NO3)2 effectively reduces the amount of lime used and alkalinity during the antimony roughing flotation and concentrating processes, while maintaining the antimony recovery rate and improving the stickiness of the ore foam. Furthermore, the modified polyacrylamide has minimal environmental pollution and is more environmentally friendly.

[0016] In addition, the present invention provides another low-alkalinity flotation separation process for stibnite and arsenopyrite, which adds the micro-area oxidation effect of potassium permanganate during the antimony roughing flotation and concentration process, thereby increasing the hydrophobicity of the mineral surface, making it easier to combine with the collector, thereby improving the flotation effect of stibnite. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The flotation separation process flow chart provided by an embodiment of the present invention is shown; Figure 2A simplified process flow diagram of low-alkalinity flotation separation of stibnite and arsenopyrite provided by an embodiment of the present invention is shown; Figure 3 A simplified process flow chart of another low-alkalinity flotation separation process of stibnite and arsenopyrite provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the present invention and its application or use. Based on the embodiments of the present invention, any product that is identical or similar to the present invention and is obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts falls within the scope of protection of the present invention. In addition, all other embodiments obtained by ordinary technicians in this field without carrying out creative work fall within the scope of protection of the present invention.

[0020] Where specific experimental steps or conditions are not specified in the examples, the conventional experimental steps or conditions described in the prior art in the art may be used. Reagents and other instruments used, for which the manufacturer is not specified, are commercially available conventional reagent products. Furthermore, the accompanying drawings are merely schematic illustrations of embodiments of the present invention and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and their repeated descriptions will be omitted. Some block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0021] Technologies, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies, methods, and equipment should be considered part of the description of the present invention.

[0022] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In a first aspect, the present invention provides a process for flotation separation of stibnite and arsenopyrite with low alkalinity. Figure 1 The flotation separation process steps provided by the embodiment of the present invention are shown in FIG. Figure 1As shown, the method includes the following steps: S1. After grinding the antimony-arsenic mixed concentrate, lime is added to adjust the pH value to weak alkalinity, and then an appropriate amount of Pb(NO3)2, modified polyacrylamide and a collector are added to perform antimony roughing flotation to obtain antimony rough concentrate and roughing tailings; During the specific implementation of this step, the antimony-arsenic mixed concentrate is obtained by flotation of antimony-arsenic mixed ore containing stibnite and arsenopyrite. The antimony-arsenic mixed concentrate obtained is ground according to the grinding fineness requirement of 55% of -200 mesh to 90% of -400 mesh. Then, lime is added to the ground antimony-arsenic mixed concentrate to adjust the pH of the antimony-arsenic mixed concentrate to remain in a weakly alkaline range. An activator Pb(NO3)2, modified polyacrylamide and a collector are further added to perform antimony roughing flotation to obtain an antimony rough concentrate 1 and a roughing tailing. The modified polyacrylamide is specifically a mixture of sulfonic acid polyacrylamide and hydroxyl polyacrylamide, and the mass ratio of sulfonic acid polyacrylamide to hydroxyl polyacrylamide is 1:1 to 1:10. Under the combined action of the modified polyacrylamide, lime and Pb(NO3)2, the alkalinity of the antimony roughing flotation is effectively reduced, the floating of arsenic is suppressed, and the recovery of antimony and arsenic minerals is not affected.

[0025] During the specific implementation of this step, per ton of ore, the amount of lime added is 500-2000 g / t; the amount of modified polyacrylamide added is 100-400 g / t; the amount of Pb(NO3)2 added is 100-800 g / t; preferably, the amount of lime added is 1000-2000 g / t; preferably, the amount of modified polyacrylamide added is 200-300 g / t; preferably, the amount of Pb(NO3)2 added is 400-500 g / t. In some embodiments, the pH of the antimony-arsenic mixed concentrate is adjusted with lime, preferably to pH=8-11, and as an example, it can be 8, 9, 10 or 11.

[0026] In some embodiments, the antimony roughing flotation can be performed multiple times to ensure the flotation effect. The number of antimony roughing flotation can be 1 to 2 times; and the time of antimony roughing flotation can be controlled to be 3 to 9 minutes each time.

[0027] S2, adding lime, Pb(NO3)2 and a collector to the roughing tailings, performing multiple sweeping operations to obtain a high-arsenic product; During the specific implementation of this step, lime, collector and Pb(NO3)2 are used together to scavenging the roughing tailings separated after antimony roughing flotation, so that the collector has a stronger binding ability for arsenic; the number of scavenging is controlled at 1 to 5 times; the time of each scavenging is controlled at 4 to 5 minutes, and finally a high-arsenic product is obtained.

[0028] In the specific implementation of this step, the amount of lime added is 100-2000 g / t; the amount of Pb(NO3)2 added is 50-800 g / t. Preferably, the amount of lime added is 500-1000 g / t; preferably, the amount of Pb(NO3)2 added is 100-200 g / t.

[0029] S3, adding lime to the antimony crude concentrate to adjust the pH to weak alkalinity, then adding appropriate amounts of Pb(NO3)2, modified polyacrylamide and antimony collector, and performing multiple concentrations to obtain antimony concentrate; In the specific implementation of this step, lime, modified polyacrylamide and Pb(NO3)2 are used together to perform multiple cleaning on the antimony concentrate separated after antimony rough flotation. The number of cleaning times is 1 to 6 times; each cleaning time is 2 to 6 minutes. During the specific implementation of this step, based on each ton of ore, the amount of lime added is 200-2000 g / t; the amount of modified polyacrylamide added is 10-100 g / t; the amount of Pb(NO3)2 added is 20-300 g / t; preferably, the amount of lime added is 500-2000 g / t; preferably, the amount of modified polyacrylamide added is 12-50 g / t; and preferably, the amount of Pb(NO3)2 added is 40-200 g / t.

[0030] The collector used in the embodiment of the present invention is selected from at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium black medicine. The amount of the collector used is 10-50 g / t per ton of ore.

[0031] In some embodiments, during the antimony roughing flotation process of an antimony-arsenic mixed concentrate, a certain amount of potassium permanganate is added simultaneously with the addition of lime, an appropriate amount of Pb(NO3)2, modified polyacrylamide, and a collector. The micro-oxidation effect of the potassium permanganate increases the hydrophobicity of the mineral surface, enabling better binding with the collector, thereby improving the antimony roughing flotation efficiency. Based on the same principle, during the multiple concentrating processes of the antimony roughing concentrate, a certain amount of potassium permanganate is added simultaneously with the addition of an appropriate amount of Pb(NO3)2, modified polyacrylamide, and a collector to improve the antimony concentrating efficiency. The amount of potassium permanganate added is 50-500 g / t per ton of ore.

[0032] In order to enable those skilled in the art to more clearly understand the present invention, the process for flotation separation of stibnite and arsenopyrite with low alkalinity according to the present invention is now described in detail through the following examples.

[0033] Example 1 Flotation separation object: After mixed roughing of the raw ore of a certain antimony sulfide arsenic mine, an antimony arsenic mixed concentrate was obtained. The main metal sulfides in the antimony arsenic mixed concentrate are stibnite, arsenopyrite, pyrite, chalcanthite / stibnite (containing 0.97% antimony and 0.3% arsenic), in addition to a small amount of quartz, sphalerite and other minerals.

[0034] Figure 2 The following is a simplified process flow diagram of the low alkalinity flotation separation of stibnite and arsenopyrite provided by an embodiment of the present invention, as shown in FIG. Figure 2 As shown, 1000 g / t of lime as an inhibitor was added to the antimony-arsenic mixed concentrate for slurry adjustment. When the pH reached 9, 200 g / t of modified polyacrylamide, 2500 g / t of Pb(NO3), and 16 g / t of butylamine black medicine as a collector were added. After 2 minutes of action, rough flotation was carried out. The rough flotation time was 4 minutes to obtain antimony rough concentrate and rough tailings.

[0035] Furthermore, the antimony crude concentrate was subjected to flotation, with the addition of 500 g / t lime depressant, 50 g / t modified polyacrylamide, 2200 g / t Pb(NO3), and 14 g / t butylamine collector. The slurry was mixed for 3 minutes, and then flotation was performed for 6 minutes to obtain flotation I underflow and flotation I foam. Furthermore, lime inhibitor 500 g / t, modified polyacrylamide 50 g / t, and Pb(NO3)2 120 g / t were added to the refined foam I, and the slurry was adjusted for 3 minutes to carry out refined II (refined II). The refined II time was 4 minutes to obtain refined II underflow and refined II foam. Furthermore, lime inhibitor 300 g / t, modified polyacrylamide 12 g / t, and Pb(NO3) 240 g / t were added to the refined II foam, and the slurry was adjusted for 3 minutes to carry out refined III (refined III). The refined III time was 3 minutes to obtain refined III underflow and refined III foam. Furthermore, 200 g / t of lime as an inhibitor and 12 g / t of modified polyacrylamide were added to the refined III foam to obtain a refined foam as antimony concentrate.

[0036] The underflow generated by the Selection II and Selection III processes is returned in the order in which it is marked; The underflow obtained from the cleaning process I and the foam obtained from the scavenging process I are combined and returned to the roughing process.

[0037] Furthermore, scavenging flotation was performed on the rougher tailings, with the addition of 500 g / t lime depressant, 2200 g / t Pb(NO3), and 14 g / t butylamine collector. The slurry was mixed for 3 minutes, and scavenging I (scavenging one) was performed for 3 minutes to obtain scavenging foam 1 and scavenging tailings 1. Scavenging foam 1 was a high-arsenic product. Furthermore, inhibitors such as lime (1000 g / t), Pb(NO3)2 (100 g / t), and collector such as butylamine black medicine (14 g / t) were added to the scavenging tailings 1 again, and the slurry was adjusted for 3 minutes. Scavenging II (scavenging II) was carried out for 3 minutes to obtain scavenging foam 2 and scavenging tailings 2. The scavenging foam 2 was returned to scavenging I as appropriate.

[0038] The ratio of the modified polyacrylamide in this embodiment is: the mass ratio of sulfonic acid polyacrylamide and hydroxy polyacrylamide in the modified polyacrylamide is 1:2.

[0039] The antimony concentrate and scavenging tailings 2 are obtained by flotation, and the antimony concentrate can be obtained after filtering and drying. The flotation separation experimental results of this embodiment are shown in Table 1.

[0040] The low-alkalinity antimony and arsenic mineral flotation separation process provided in this embodiment significantly reduces the amount of lime added by adding modified polyacrylamide to replace part of the lime during antimony roughing flotation and concentration, using Pb(NO3)2 as an activator. The modified polyacrylamide and lime together serve as inhibitors, thereby reducing the alkalinity of the antimony and arsenic sulfide ore and the antimony rough concentrate, thereby suppressing the flotation of arsenic in the ore, achieving low-alkalinity separation of antimony and arsenic minerals, reducing the stickiness of the ore foam, and not affecting the recovery rate of the antimony and arsenic ores.

[0041] Example 2 Flotation separation object: After mixed roughing of the raw ore of a certain antimony sulfide arsenic mine, an antimony arsenic mixed concentrate was obtained. The main metal sulfides in the antimony arsenic mixed concentrate are stibnite, arsenopyrite, pyrite, chalcanthite / stibnite (containing 0.97% antimony and 0.3% arsenic), in addition to a small amount of quartz, sphalerite and other minerals.

[0042] Figure 3 FIG. 1 shows another simplified process flow diagram of low alkalinity flotation separation of stibnite and arsenopyrite provided by an embodiment of the present invention, as shown in FIG. Figure 3 As shown in the figure, 1000 g / t of lime as an inhibitor was added to the antimony-arsenic mixed sulfide ore for slurry adjustment. When the pH reached 9, 500 g / t of potassium permanganate, 200 g / t of modified polyacrylamide, 2500 g / t of Pb(NO3), and 16 g / t of collector butylamine were added for 2 minutes and then rough flotation was carried out. The rough flotation time was 4 minutes to obtain antimony rough concentrate and rough tailings.

[0043] Furthermore, the antimony crude concentrate was subjected to flotation, with the addition of depressants such as lime 500 g / t, potassium permanganate 100 g / t, modified polyacrylamide 50 g / t, Pb(NO3)2200 g / t, and collector butylamine black medicine 14 g / t. The slurry was mixed for 3 minutes, and then flotation I (fine one) was carried out for 6 minutes to obtain fine I underflow and fine I foam. Furthermore, lime inhibitor 500 g / t, modified polyacrylamide 50 g / t, and Pb(NO3)2 120 g / t were added to the refined foam I, and the slurry was adjusted for 3 minutes to carry out refined II (refined II). The refined II time was 4 minutes to obtain refined II underflow and refined II foam. Furthermore, lime inhibitor 300 g / t, modified polyacrylamide 12 g / t, and Pb(NO3) 240 g / t were added to the refined II foam, and the slurry was adjusted for 3 minutes to carry out refined III (refined III). The refined III time was 3 minutes to obtain refined III underflow and refined III foam. Furthermore, 200 g / t of lime as an inhibitor and 12 g / t of modified polyacrylamide were added to the refined III foam to obtain a refined foam as antimony concentrate.

[0044] The underflow generated by the selection II and selection III processes is returned in the order marked; The underflow obtained from cleaning I and the foam obtained from scavenging I are combined and returned to roughing II.

[0045] Furthermore, scavenging flotation was performed on the rougher tailings, with the addition of 500 g / t lime depressant, 2200 g / t Pb(NO3), and 14 g / t butylamine black powder collector. The slurry was mixed for 3 minutes, and scavenging I (scavenging one) was performed for 3 minutes, obtaining scavenging foam 1 and scavenging tailings 1. Scavenging foam 1 was a high-arsenic product. Furthermore, inhibitors of lime (1000 g / t), Pb(NO3)2 (100 g / t), and collector (butylamine black powder) (14 g / t) were added to the scavenging tailings 1 again, and the slurry was mixed for 3 minutes. Scavenging II (scavenging II) was carried out for 3 minutes to obtain scavenging foam 2 and scavenging tailings 2. The scavenging foam 2 was returned to scavenging I as appropriate.

[0046] The ratio of the modified polyacrylamide in this embodiment is: the mass ratio of sulfonic acid polyacrylamide and hydroxy polyacrylamide in the modified polyacrylamide is 1:2.

[0047] The antimony concentrate and scavenging tailings 2 are obtained by flotation, and the antimony concentrate can be obtained after filtering and drying. The flotation separation experimental results of this embodiment are shown in Table 1.

[0048] The low-alkalinity antimony and arsenic mineral flotation separation process provided in this embodiment adds potassium permanganate for micro-area oxidation during antimony roughing flotation and concentrating, and uses modified polyacrylamide to replace part of the lime. Under the combined action of modified polyacrylamide and lime as inhibitors, potassium permanganate, and activator Pb(NO3)2, the amount of lime added is greatly reduced, thereby reducing the alkalinity of antimony and arsenic sulfide ore and antimony rough concentrate, inhibiting the flotation of arsenic in the ore, achieving low-alkalinity separation of antimony and arsenic minerals, reducing the stickiness of the ore foam, and not affecting the recovery rate of the antimony and arsenic ore.

[0049] Comparative Example 1 Compared to Example 1, the conventional flotation separation process involved adding 6000 g / t of lime as an inhibitor to the antimony-arsenic mixed sulfide ore for slurry preparation. Modified polyacrylamide was not added throughout the entire process, and all other conditions remained unchanged. The final flotation separation experimental results are shown in Table 1.

[0050] Table 1 Comparison of indicators between the process of the present invention and the traditional process in Example 1

[0051] From the data shown in Table 1, it can be seen that compared with Comparative Example 1, after Example 1 partially replaced lime with modified polyacrylamide, the arsenic in the antimony concentrate was significantly reduced, and the antimony-arsenic separation effect was better than that of the comparative example; in Example 2, after potassium permanganate + modified polyacrylamide partially replaced lime, the arsenic in the antimony concentrate was significantly reduced, and the antimony-arsenic separation effect was better than that of Example 1.

[0052] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0053] For simplicity of description, the method embodiments are described as a series of actions. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, as certain steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also be aware that the embodiments described in this specification are preferred embodiments, and the actions and components involved are not necessarily required for the present invention.

[0054] The above is a detailed introduction to the low-alkalinity flotation separation process of stibnite and arsenopyrite provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core concept. At the same time, for those skilled in the art, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A process for flotation separation of stibnite and arsenopyrite with low basicity, characterized in that: The method comprises the following steps: S1. After grinding the antimony-arsenic mixed concentrate, lime is added to adjust the pH value to weak alkalinity, and then an appropriate amount of Pb(NO3)2, modified polyacrylamide and a collector are added to carry out antimony roughing flotation to obtain antimony rough concentrate and roughing tailings; based on each ton of ore, the amount of lime added is 500-2000 g / t; the amount of modified polyacrylamide added is 100-400 g / t; and the amount of Pb(NO3)2 added is 100-800 g / t; S2, adding lime, Pb(NO3)2 and a collector to the roughing tailings, and performing multiple scavenging to obtain a high-arsenic product; wherein the amount of lime added is 100-2000 g / t; the amount of Pb(NO3)2 added is 50-800 g / t; S3, adding lime to the antimony crude concentrate to adjust the pH to weak alkalinity, then adding appropriate amount of Pb(NO3)2, modified polyacrylamide and collector, and performing multiple concentration to obtain antimony concentrate; based on each ton of ore, the amount of lime added is 200-2000 g / t; the amount of modified polyacrylamide added is 10-100 g / t; the amount of Pb(NO3)2 added is 20-300 g / t; The modified polyacrylamide is a mixture of sulfonic acid polyacrylamide and hydroxy polyacrylamide; the mass ratio of the sulfonic acid polyacrylamide to the hydroxy polyacrylamide is 1:1-1:

10.

2. The process according to claim 1, characterized in that In step S1, the antimony roughing flotation process also requires adding an appropriate amount of potassium permanganate; Calculated per ton of ore, the amount of potassium permanganate added is 50-500 g / t.

3. The process according to claim 1, characterized in that In step S3, the process of beneficiating the antimony concentrate further requires adding an appropriate amount of potassium permanganate; Calculated per ton of ore, the amount of potassium permanganate added is 50-500 g / t.

4. The process according to claim 1, characterized in that In step S1, the grinding fineness is -200 mesh 55% to -400 mesh 90%.

5. The process according to claim 1, characterized in that In step S1, the antimony roughing flotation is performed 1 to 2 times; and the time of each antimony roughing flotation is 3 to 9 minutes.

6. The process according to claim 1, characterized in that In step S1, based on per ton of ore, the amount of lime added is 1000-2000 g / t; the amount of modified polyacrylamide added is 200-300 g / t; the amount of Pb(NO3)2 added is 400-500 g / t; In step S2, the amount of lime added is 500-1000 g / t per ton of ore; the amount of Pb(NO3)2 added is 100-200 g / t; In step S3, the amount of lime added is 500~2000 g / t; the amount of modified polyacrylamide added is 12~50 g / t; and the amount of Pb(NO3)2 added is 40~200 g / t.

7. The process according to claim 1, characterized in that In step S2, the scanning is performed 1 to 5 times, and each scanning takes 4 to 5 minutes.

8. The process according to claim 1, characterized in that In step S3, the number of selections is 1 to 6 times; and the time for each selection is 2 to 6 minutes.

9. The process according to claim 1, characterized in that The collector is at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium black medicine.

10. The process according to claim 1 or 9, characterized in that The added amount of the collector is 10-50 g / t.

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