Beneficiation method for improving nickel recovery rate of high-content talc nickel sulfide ore

Abstract

The invention discloses a beneficiation method for improving the nickel recovery rate of high-content talc nickel sulfide ore. The beneficiation method comprises the following steps that A, raw materials are pretreated; b.1, a roughing process: feeding the ore pulp A3 obtained in the step A.3.1 into a roughing flotation machine to carry out roughing operation for four times; b.2, the roughing concentrate B1 obtained in the step B.1 is fed into a stirring tank, and 280 g / t of CMC, 550 g / t of water glass and 50 g / t of butyl xanthate are added; c.1, primary fine selection; c.2, carrying out secondary fine selection; c.3, third-time concentration: feeding the secondary concentrate product C3 into a flotation machine for third-time concentration, adding water to adjust the concentration of ore pulp to 12-15%, filling 3122 Am < 3 > / h into the ore pulp, and carrying out flotation for 10-12 minutes to obtain a third-time concentrate product C5 and third-time concentration tailing products C6 and C5 which serve as final concentrates to be concentrated and filtered for sale; and the third-time concentration tailing product C6 is fed into the step C.2.

Description

Technical Field

[0001] The invention relates to the technical field of beneficiation of high-content talc nickel sulfide ores, and in particular to a beneficiation method for improving nickel recovery rate of high-content talc nickel sulfide ores. Background Art

[0002] Through the process mineralogy research of a nickel-cobalt sulfide ore, it was found that the nickel minerals in the ore are mainly pyrrhotite, pentlandite and trace amounts of red arsenic nickel ore, nickel ore and iron-nickel alum; the pyrite minerals are mainly pyrrhotite, and some pyrrhotites contain nickel; the gangue minerals are mainly talc, serpentine, and olivine, followed by pyroxene, feldspar, actinolite, mica, quartz, epidote, chlorite, etc., among which the talc content is as high as 21.67%.

[0003] According to reports, talc is a layered mineral with distinct end faces and base faces. The base face is a non-polar surface that exhibits strong hydrophobicity, while the end face exposes MgOH+, making it hydrophilic. The talc base face content is much higher than the end face content, so the talc as a whole exhibits very good floatability. In addition, the Mohs hardness of talc is very small. In the on-site process flow, it is easy to over-grind during grinding to produce a large amount of fine mud, which greatly increases the amount of flotation reagents used and worsens the flotation environment.

[0004] From the perspective of process mineralogy: Since talc minerals are very easy to become muddy and have good floatability, and are very easy to agglomerate and cover during flotation, a large amount of flotation reagents are consumed when entering the flotation operation, making it difficult to capture the target mineral. In addition, for the entire flotation process, the flotation environment will be deteriorated, thereby greatly affecting the flotation index and the flotation performance of sulfide minerals. Since talc in the ore is a layered silicate mineral with easy floating characteristics, it is difficult to effectively inhibit it using conventional inhibitors. The use of CMC can significantly enhance the wettability of the talc particle layer and end surface and make them consistent. CMC chemically adsorbs the metal ions on the surface of talc fine mud, thereby inhibiting the talc that floats due to surface hydrophobicity, and can also inhibit serpentine ore mud to achieve flotation separation of sulfide ore and talc.

[0005] The CMC reagent beneficiation test shows that the CMC dosage has a great influence on the beneficiation index. When the dosage is large, it not only inhibits silicate minerals, but also inhibits metal minerals such as nickel. When the dosage is small, it cannot inhibit the gangue minerals. Choosing the appropriate dosage is the key to mastering the CMC inhibitor to improve the beneficiation technical indicators of high-content talc sulfide ores. Moreover, CMC cannot prevent a small amount of talc from floating up due to foam entrainment, so setting a reasonable dosing point and coordinating the dosage of collectors and activators plays an important role in whether CMC can fully exert its efficacy and inhibit gangue minerals. Summary of the invention

[0006] In view of the above technical problems, the present invention provides a beneficiation method for improving nickel recovery rate of high-content talc sulfide nickel ore.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: A method for beneficiating a high-content talc-sulfide nickel ore to improve nickel recovery rate comprises the following steps: A. Raw material pretreatment: A.1. Crushing: The high-magnesium nickel-cobalt sulfide ore is sent to the coarse crushing station for crushing to obtain a coarse crushed product A1 with a particle size of less than -270 mm; A.2. Grinding and classification: A.2.1, grinding process: the coarsely crushed product A1 obtained in step A.1 is added with CMC 320g / t at the feed end of the semi-autogenous mill, processed by the semi-autogenous mill-stone crushing process, and then subjected to ball mill closed-circuit grinding-classification operation to obtain a pulp A2 with a content of -200 mesh equal to 75%, which is used as a raw material for flotation. In the closed-circuit grinding-classification process, CMC 30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the amount of the semi-autogenous mill discharge under the vibrating screen; A.3. Pulp preparation, stirring and flotation: A.3.1. Feed the flotation material A2 obtained in step A.2.1 into a rough stirring tank, add 80 g / t of butyl xanthate and 60 g / t of copper sulfate to adjust the pH value of the pulp to 8.5-9.0; add water to adjust the concentration of the pulp to 32±2%, add 50 g / t of 2# oil foaming agent, and then stir for 6-8 minutes until the pH value of the pulp reaches 8.5-9.0, to obtain pulp A3; B.1, roughing process: the pulp A3 obtained in step A.3.1 is fed into the roughing flotation machine for four roughing operations, and a total of 13271 Am3 / h of air is charged into the pulp. In the first roughing operation, 40 g / t of butyl xanthate and 40 g / t of copper sulfate are added; in the second roughing operation, 30 g / t of butyl xanthate, 80 g / t of copper sulfate and 100 g / t of CMC are added; in the third roughing operation, 10 g / t of butyl xanthate, 20 g / t of copper sulfate and 50 g / t of CMC are added; in the fourth roughing operation, 10 g / t of butyl xanthate and 30 g / t of CMC are added, and the flotation time is 40-42 minutes in total, and a roughing concentrate product B1 and a fourth roughing tailing product B2 are obtained; the fourth roughing tailing product B2 obtained in B.1 is used as the final tailings and is sent to the tailings pond for storage after being concentrated; B.2. Feed the rougher concentrate B1 obtained in step B.1 into a stirring tank, add 280 g / t of CMC, 550 g / t of water glass, 50 g / t of butyl xanthate, and 10 g / t of 2# oil foaming agent; adjust the pH value of the slurry to 8.5-9.0; add water to adjust the concentration of the slurry to 10-12%, and obtain product A4; C.1. Primary concentration: feed the product A4 obtained in step B.2 into a flotation machine for concentration, add water to adjust the pulp concentration to 10-12%, fill the pulp with air at 13370 Am3 / h, and float for 34-36 minutes to obtain a primary concentrated concentrate product C1 and a primary concentrated tailings product C2; C.2. Secondary concentration: feed the primary concentrated ore product C1 into a flotation machine for secondary concentration, add water to adjust the pulp concentration to 15-20%, fill the pulp with air at 6035 Am3 / h, float for 10-12 minutes, and obtain secondary concentrated ore product C3 and secondary concentrated tailing product C4; feed the secondary concentrated tailing product C4 into a stirring tank, add CMC 20g / t, butyl xanthate 20g / t, 2# oil 10g / t, and adjust the pH value of the pulp to 8.5-9.0; add water to adjust the pulp concentration to 12-15%, and obtain pulp A6, and feed pulp A6 into step C.1; C.3. Tertiary concentration: feed the secondary concentrate product C3 into the flotation machine for tertiary concentration, add water to adjust the pulp concentration to 12-15%, fill the pulp with air at 3122 Am3 / h, float for 10-12 minutes, and obtain tertiary concentrate product C5 and tertiary concentrated tailings product C6. C5 is used as the final concentrate and is concentrated and filtered before being sold; feed the tertiary concentrated tailings product C6 into step C.2.

[0008] Wherein, in the step A.1, the crushing operation is performed by a gyratory crusher.

[0009] Among them, in the step C.1, the single-selected tailings product C2 is subjected to a single fine scavenging to obtain a single-selected concentrate product C7 and a single-selected tailings product C8; the single-selected tailings product C8 is subjected to a secondary fine scavenging to obtain a secondary fine scavenging concentrate product C9 and a secondary fine scavenging tailings product C10; the secondary fine scavenging tailings product C10 is subjected to a tertiary fine scavenging to obtain a tertiary fine scavenging concentrate product C11 and a tertiary fine scavenging tailings product C12, and the tertiary fine scavenging tailings product C12 is sent to the tailings pond for storage after being concentrated as the final tailings; the single-selected concentrate product C7 is sent to step C.1; the secondary fine scavenging concentrate product C9 is sent to the single-selected process; and the tertiary fine scavenging concentrate product C11 is sent to the secondary fine scavenging process.

[0010] The beneficial effects of the present invention are: 1. The present invention increases the nickel grade of the concentrate of a certain nickel-cobalt sulfide ore by 1.75%, reduces the nickel grade of the tailings by 0.035%, reduces the magnesium oxide content of the concentrate by 2.62%, and increases the nickel recovery rate by 5.2%. At the same time, it can provide a reference for flotation removal of talc from high-talc nickel sulfide ores.

[0011] 2. The present invention achieves the purpose of improving the roughing concentrate operation yield by rationally optimizing the flotation operation process, and adopts a four-time roughing, three-time cleaning and sweeping cleaning process for a certain high-talc nickel sulfide ore, thereby solving the problem of low roughing yield caused by sticky foam and poor fluidity due to the large amount of talc fine mud and easy floating.

[0012] 3. The present invention is aimed at a high-talc nickel sulfide ore in the form of talc and other easily floatable minerals. CMC reagents that strongly inhibit layered silicates are added in each flotation operation section to disperse the ore mud and reduce the ore mud cover. Collectors and activators that can capture metal minerals are added in each flotation operation section, and the "strong pressure and strong pull" drug secret is used for flotation.

[0013] 4. The present invention enhances the mineralization effect of the reagents by pre-adding the butyl xanthate collector and the copper sulfate activator, facilitates the metal enrichment in the ore pulp, increases the synergistic effect of the butyl xanthate collector and the copper sulfate activator on the ore pulp particles, eliminates the harmful effects of inhibitory ions in the ore pulp, and enhances the collection effect of butyl xanthate on the target mineral. 5. The present invention effectively regulates the flotation efficiency and controls the flotation speed of fine mud by multi-point segmented dosing to avoid premature floating of fine mud; avoids the inhibition of nickel minerals after the one-time addition of inhibitors, avoids excessive adsorption of fine particles and fine mud minerals to reduce the collection effect after the one-time addition of collectors and activators, gives full play to the synergistic effect of reagents, gives full play to the efficiency of flotation reagents, improves the quality of concentrate, and finally achieves the purpose of improving the concentrate recovery rate.

[0014] 6. Aiming at the problems of high-content talc sulfide nickel ore, which is prone to over-grinding, high content of fine-grained minerals, low roughing efficiency and low roughing concentrate yield due to sticky foam and poor fluidity, the present invention has developed a process flow of "four roughing, three fine cleaning and three fine sweeping", which effectively improves the nickel recovery rate.

[0015] 7. The present invention aims at the flotation process of nickel sulfide ore with high talc content. The flotation efficiency is effectively regulated by multi-point segmented dosing, the flotation speed of fine mud is controlled, the premature floating of fine mud is avoided, the nickel minerals are suppressed after the inhibitor is added once, and the excessive adsorption of fine particles and fine mud minerals after the collector and activator are added once, which reduces the collection effect. The multi-point segmented dosing method is adopted to give full play to the efficiency of flotation reagents, and finally achieve the purpose of improving the concentrate recovery rate.

[0016] 8. The present invention aims at nickel sulfide ores with high talc content. CMC reagents with strong inhibition of layered silicate talc are added in each flotation operation section to disperse the ore mud and reduce the ore mud cover. Butyl xanthate and copper sulfate, which are strong collectors capable of capturing metal minerals, are added in each flotation operation section. The "strong pressure and strong pull" drug secret is used for flotation, which effectively improves the flotation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a process flow chart of the present invention; DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] Example 1 like Figure 1 As shown, a beneficiation method for improving nickel recovery rate of high-content talc sulfide nickel ore comprises the following steps: A. Raw material pretreatment: A.1. Crushing: The high-magnesium nickel-cobalt sulfide ore is sent to the coarse crushing station for crushing to obtain a coarse crushed product A1 with a particle size of less than -270 mm; A.2. Grinding and classification: A.2.1, grinding process: the coarsely crushed product A1 obtained in step A.1 is added with CMC 320g / t at the feed end of the semi-autogenous mill, processed by the semi-autogenous mill-stone crushing process, and then subjected to ball mill closed-circuit grinding-classification operation to obtain a pulp A2 with a content of -200 mesh equal to 75%, which is used as a raw material for flotation. In the closed-circuit grinding-classification process, CMC 30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the amount of the semi-autogenous mill discharge under the vibrating screen; A.3. Pulp preparation, stirring and flotation: A.3.1. Feed the flotation material A2 obtained in step A.2.1 into a rough stirring tank, add 80 g / t of butyl xanthate and 60 g / t of copper sulfate to make the pH value of the pulp reach 8.5; add water to adjust the concentration of the pulp to 30%, add 50 g / t of 2# oil frother, and then stir for 6 minutes. The pH value of the pulp reaches 8.5 to obtain pulp A3; B.1. Roughing process: The pulp A3 obtained in step A.3.1 is fed into the roughing flotation machine for four roughing operations. A total of 13271 Am of air is added to the pulp. 3 / h, 40g / t of butyl xanthate and 40g / t of copper sulfate were added in the first roughing operation; 30g / t of butyl xanthate, 80g / t of copper sulfate and 100g / t of CMC were added in the second roughing operation; 10g / t of butyl xanthate, 20g / t of copper sulfate and 50g / t of CMC were added in the third roughing operation; 10g / t of butyl xanthate and 30g / t of CMC were added in the fourth roughing operation, and the flotation time was 40 minutes in total, to obtain a roughing concentrate product B1 and a fourth roughing tailing product B2; the fourth roughing tailing product B2 obtained from B.1 was used as the final tailings and was sent to the tailings pond for storage after being concentrated; B.2. Feed the rougher concentrate B1 obtained in step B.1 into a stirring tank, add 280 g / t of CMC, 550 g / t of water glass, 50 g / t of butyl xanthate, and 10 g / t of 2# oil foaming agent; adjust the pH value of the slurry to 8.5; add water to adjust the concentration of the slurry to 10%, and obtain product A4; C.1. Primary concentration: Feed the product A4 obtained in step B.2 into the flotation machine for concentration, add water to adjust the pulp concentration to 10%, and fill the pulp with air 13370 Am 3 / h, flotation for 34 minutes, to obtain the primary concentrated ore product C1 and the primary concentrated tailings product C2; C.2. Secondary concentration: Feed the primary concentrated ore product C1 into the flotation machine for secondary concentration, add water to adjust the pulp concentration to 15%, and fill the pulp with air 6035 Am 3 / h, flotation for 10 minutes, to obtain secondary concentrate product C3 and secondary concentrated tailings product C4; feed the secondary concentrated tailings product C4 into a stirring tank, add CMC 20g / t, butyl xanthate 20g / t, 2# oil 10g / t, so that the pH value of the pulp reaches 8.5; add water to adjust the concentration of the pulp to 12%, to obtain pulp A6, and feed pulp A6 into step C.1; C.3. Third concentration: Feed the secondary concentrate product C3 into the flotation machine for third concentration, add water to adjust the pulp concentration to 12%, and fill the pulp with air 3122 Am 3 / h, flotation for 10 minutes, to obtain tertiary concentrate product C5 and tertiary concentrated tailings product C6. C5 is used as the final concentrate and then concentrated and filtered to wait for sale; the tertiary concentrated tailings product C6 is fed into step C.2.

[0020] Wherein, in the step A.1, the crushing operation is performed by a gyratory crusher.

[0021] Among them, in the step C.1, the single-selected tailings product C2 is subjected to a single fine scavenging to obtain a single-selected concentrate product C7 and a single-selected tailings product C8; the single-selected tailings product C8 is subjected to a secondary fine scavenging to obtain a secondary fine scavenging concentrate product C9 and a secondary fine scavenging tailings product C10; the secondary fine scavenging tailings product C10 is subjected to a tertiary fine scavenging to obtain a tertiary fine scavenging concentrate product C11 and a tertiary fine scavenging tailings product C12, and the tertiary fine scavenging tailings product C12 is sent to the tailings pond for storage after being concentrated as the final tailings; the single-selected concentrate product C7 is sent to step C.1; the secondary fine scavenging concentrate product C9 is sent to the single-selected process; and the tertiary fine scavenging concentrate product C11 is sent to the secondary fine scavenging process.

[0022] Example 2 like Figure 1 As shown, a beneficiation method for improving nickel recovery rate of high-content talc sulfide nickel ore comprises the following steps: A. Raw material pretreatment: A.1. Crushing: The high-magnesium nickel-cobalt sulfide ore is sent to the coarse crushing station for crushing to obtain a coarse crushed product A1 with a particle size of less than -270 mm; A.2. Grinding and classification: A.2.1, grinding process: the coarsely crushed product A1 obtained in step A.1 is added with CMC 320g / t at the feed end of the semi-autogenous mill, processed by the semi-autogenous mill-stone crushing process, and then subjected to ball mill closed-circuit grinding-classification operation to obtain a pulp A2 with a content of -200 mesh equal to 75%, which is used as a raw material for flotation. In the closed-circuit grinding-classification process, CMC 30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the amount of the semi-autogenous mill discharge under the vibrating screen; A.3. Pulp preparation, stirring and flotation: A.3.1. Feed the flotation material A2 obtained in step A.2.1 into a rough stirring tank, add 80 g / t of butyl xanthate and 60 g / t of copper sulfate to make the pH value of the pulp reach 9.0; add water to adjust the concentration of the pulp to 34%, add 50 g / t of 2# oil foaming agent, and then stir for 6-8 minutes until the pH value of the pulp reaches 9.0, to obtain pulp A3; B.1. Roughing process: The pulp A3 obtained in step A.3.1 is fed into the roughing flotation machine for four roughing operations. A total of 13271 Am of air is added to the pulp. 3 / h, 40g / t of butyl xanthate and 40g / t of copper sulfate were added in the first roughing operation; 30g / t of butyl xanthate, 80g / t of copper sulfate and 100g / t of CMC were added in the second roughing operation; 10g / t of butyl xanthate, 20g / t of copper sulfate and 50g / t of CMC were added in the third roughing operation; 10g / t of butyl xanthate and 30g / t of CMC were added in the fourth roughing operation, and the flotation time was 42 minutes in total, and a roughing concentrate product B1 and a fourth roughing tailing product B2 were obtained; the fourth roughing tailing product B2 obtained from B.1 was used as the final tailings and sent to the tailings pond for storage after being concentrated; B.2. Feed the rougher concentrate B1 obtained in step B.1 into a stirring tank, add 280 g / t of CMC, 550 g / t of water glass, 50 g / t of butyl xanthate, and 10 g / t of 2# oil foaming agent; adjust the pH value of the slurry to 9.0; add water to adjust the concentration of the slurry to 12%, and obtain product A4; C.1. Primary concentration: Feed the product A4 obtained in step B.2 into the flotation machine for concentration, add water to adjust the pulp concentration to 12%, and fill the pulp with air 13370 Am 3 / h, flotation for 36 minutes, to obtain the primary concentrated ore product C1 and the primary concentrated tailings product C2; C.2. Secondary concentration: Feed the primary concentrated ore product C1 into the flotation machine for secondary concentration, add water to adjust the pulp concentration to 20%, and fill the pulp with air 6035 Am 3 / h, flotation for 12 minutes, to obtain secondary concentrate product C3 and secondary concentrated tailings product C4; feed the secondary concentrated tailings product C4 into a stirring tank, add CMC 20g / t, butyl xanthate 20g / t, 2# oil 10g / t, so that the pH value of the pulp reaches 9.0; add water to adjust the concentration of the pulp to 15%, to obtain pulp A6, and feed pulp A6 into step C.1; C.3. Third concentration: Feed the secondary concentrate product C3 into the flotation machine for third concentration, add water to adjust the pulp concentration to 15%, and fill the pulp with air 3122 Am 3 / h, flotation for 12 minutes, to obtain tertiary concentrate product C5 and tertiary concentrated tailings product C6. C5 is used as the final concentrate and then concentrated and filtered to wait for sale; the tertiary concentrated tailings product C6 is fed into step C.2.

[0023] Wherein, in the step A.1, the crushing operation is performed by a gyratory crusher.

[0024] Among them, in the step C.1, the single-selected tailings product C2 is subjected to a single fine scavenging to obtain a single-selected concentrate product C7 and a single-selected tailings product C8; the single-selected tailings product C8 is subjected to a secondary fine scavenging to obtain a secondary fine scavenging concentrate product C9 and a secondary fine scavenging tailings product C10; the secondary fine scavenging tailings product C10 is subjected to a tertiary fine scavenging to obtain a tertiary fine scavenging concentrate product C11 and a tertiary fine scavenging tailings product C12, and the tertiary fine scavenging tailings product C12 is sent to the tailings pond for storage after being concentrated as the final tailings; the single-selected concentrate product C7 is sent to step C.1; the secondary fine scavenging concentrate product C9 is sent to the single-selected process; and the tertiary fine scavenging concentrate product C11 is sent to the secondary fine scavenging process.

[0025] Example 3 Take the separation of a certain nickel-cobalt sulfide ore as an example: the nickel in the original ore mainly exists in the form of pentlandite, and the nickel grade of the original ore is about 0.72%. During production, the flotation process is four roughing, three fine cleaning, and three fine sweeping. The process flow chart is as follows Figure 1 As shown. In the flotation reagent system, CMC320g / t is added to the feed end of the semi-autogenous mill; the undersize of the semi-autogenous mill discharge enters the grinding pump pool, and CMC30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the grinding pump pool; butyl xanthate 80g / t and copper sulfate 60g / t are added to the first roughing tank; butyl xanthate 40g / t and copper sulfate 40g / t are added to the first roughing operation; butyl xanthate 30g / t, copper sulfate 80g / t, and CMC100g / t are added to the second roughing operation; butyl xanthate 10g / t is added to the third roughing operation, Copper sulfate 20g / t, CMC 50g / t; butyl xanthate 10g / t, CMC 30g / t were added in the fourth roughing operation; CMC 280g / t, water glass 550g / t, butyl xanthate 50g / t, and 2# oil frother 10g / t were added in the first concentrating operation; CMC 40g / t was added in the second concentrating operation; CMC 20g / t, butyl xanthate 20g / t, and 2# oil 10g / t were added in the third concentrating operation; butyl xanthate 15g / t, copper sulfate 10g / t, and CMC 20g / t were added in the third fine sweeping. The process index data after applying the invention patent are shown in Table 1. After being processed by the process steps of the invention patent, the nickel grade of the concentrate was increased by 0.42%, the nickel grade of the tailings was reduced by 0.017%, the magnesium oxide content of the concentrate was reduced by 1.76%, and the nickel recovery rate was increased by 3.2%, while the nickel grade and magnesium oxide content of the original ore remained basically unchanged.

[0026] Table 1 Statistics of indicators before and after implementation .

[0027] Example 4 Take the separation of a certain nickel-cobalt sulfide ore as an example: the nickel in the original ore mainly exists in the form of pentlandite, and the nickel grade of the original ore is about 0.638%. During production, the flotation process is four roughing, three fine cleaning, and three fine sweeping. The process flow chart is as follows Figure 1 As shown. In the flotation reagent system, CMC320g / t is added to the feed end of the semi-autogenous mill; the undersize of the semi-autogenous mill discharge enters the grinding pump pool, and CMC30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the grinding pump pool; butyl xanthate 80g / t and copper sulfate 60g / t are added to the first roughing tank; butyl xanthate 40g / t and copper sulfate 40g / t are added to the first roughing operation; butyl xanthate 30g / t, copper sulfate 80g / t, and CMC100g / t are added to the second roughing operation; butyl xanthate 10g / t is added to the third roughing operation, Copper sulfate 20g / t, CMC 50g / t; butyl xanthate 10g / t, CMC 30g / t were added in the fourth roughing operation; CMC 280g / t, water glass 550g / t, butyl xanthate 50g / t, 2# oil frother 10g / t were added in the first concentrating operation; CMC 40g / t was added in the second concentrating operation; CMC 20g / t, butyl xanthate 20g / t, 2# oil 10g / t were added in the third concentrating operation; butyl xanthate 15g / t, copper sulfate 10g / t, CMC 20g / t were added in the third fine sweeping operation. The process index data after applying the invention patent are shown in Table 2. After being processed by the process steps of the invention patent, the nickel grade of the concentrate was increased by 1.75%, the nickel grade of the tailings was reduced by 0.035%, the magnesium oxide content of the concentrate was reduced by 2.62%, and the nickel recovery rate was increased by 5.2%.

[0028] Table 2 Statistics of indicators before and after implementation .

[0029] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A method for beneficiating high-content talc-sulfide nickel ore to improve nickel recovery, characterized in that: The following steps are involved: A. Raw material pretreatment: A.

1. Crushing: The high-magnesium nickel-cobalt sulfide ore is sent to the coarse crushing station for crushing to obtain a coarse crushed product A1 with a particle size of less than -270 mm; A.

2. Grinding and classification: A.2.1, grinding process: the coarsely crushed product A1 obtained in step A.1 is added with CMC 320g / t at the feed end of the semi-autogenous mill, processed by the semi-autogenous mill-stone crushing process, and then subjected to ball mill closed-circuit grinding-classification operation to obtain a pulp A2 with a content of -200 mesh equal to 75%, which is used as a raw material for flotation. In the closed-circuit grinding-classification process, CMC 30g / t, butyl xanthate 40g / t, and copper sulfate 40g / t are added to the amount of the semi-autogenous mill discharge under the vibrating screen; A.

3. Pulp preparation, stirring and flotation: A.3.

1. Feed the flotation material A2 obtained in step A.2.1 into a rough stirring tank, add 80 g / t of butyl xanthate and 60 g / t of copper sulfate to adjust the pH value of the pulp to 8.5-9.0; add water to adjust the concentration of the pulp to 32±2%, add 50 g / t of 2# oil foaming agent, and then stir for 6-8 minutes until the pH value of the pulp reaches 8.5-9.0, to obtain pulp A3; B.

1. Roughing process: The pulp A3 obtained in step A.3.1 is fed into the roughing flotation machine for four roughing operations. A total of 13271 Am of air is added to the pulp. 3 / h, 40g / t of butyl xanthate and 40g / t of copper sulfate were added in the first roughing operation; 30g / t of butyl xanthate, 80g / t of copper sulfate and 100g / t of CMC were added in the second roughing operation; 10g / t of butyl xanthate, 20g / t of copper sulfate and 50g / t of CMC were added in the third roughing operation; 10g / t of butyl xanthate and 30g / t of CMC were added in the fourth roughing operation, and the flotation time was 40-42 minutes in total, to obtain a roughing concentrate product B1 and a fourth roughing tailing product B2; the fourth roughing tailing product B2 obtained from B.1 was used as the final tailings and was sent to the tailings pond for storage after being concentrated; B.

2. Feed the rougher concentrate B1 obtained in step B.1 into a stirring tank, add 280 g / t of CMC, 550 g / t of water glass, 50 g / t of butyl xanthate, and 10 g / t of 2# oil foaming agent; adjust the pH value of the slurry to 8.5-9.0; add water to adjust the concentration of the slurry to 10-12%, and obtain product A4; C.

1. Primary concentration: Feed the product A4 obtained in step B.2 into the flotation machine for concentration, add water to adjust the pulp concentration to 10-12%, and fill the pulp with air 13370 Am 3 / h, flotation for 34-36 minutes, to obtain the primary concentrated ore product C1 and the primary concentrated tailings product C2; C.

2. Secondary concentration: Feed the primary concentrated ore product C1 into the flotation machine for secondary concentration, add water to adjust the pulp concentration to 15-20%, and fill the pulp with air 6035 Am 3 / h, flotation for 10-12 minutes, to obtain secondary concentrate product C3 and secondary concentrated tailings product C4; feed the secondary concentrated tailings product C4 into a stirring tank, add CMC 20g / t, butyl xanthate 20g / t, 2# oil 10g / t, so that the pH value of the pulp reaches 8.5-9.0; add water to adjust the concentration of the pulp to 12-15%, to obtain pulp A6, and feed pulp A6 into step C.1; C.

3. Third concentration: Feed the secondary concentrate product C3 into the flotation machine for third concentration, add water to adjust the pulp concentration to 12-15%, and fill the pulp with air 3122 Am 3 / h, flotation for 10-12 minutes, to obtain tertiary concentrate product C5 and tertiary concentrated tailings product C6. C5 is used as the final concentrate and then concentrated and filtered to wait for sale; the tertiary concentrated tailings product C6 is fed into step C.

2.

2. The method for beneficiating a high-content talc-sulfide nickel ore to improve nickel recovery according to claim 1, characterized in that: In the step A.1, the crushing operation is performed by a gyratory crusher.

3. The method for beneficiating a high-content talc-sulfide nickel ore to improve nickel recovery according to claim 1, characterized in that: In the step C.1, the first-selected tailings product C2 is subjected to a first fine scavenging selection to obtain a first-selected fine scavenging concentrate product C7 and a first-selected fine scavenging tailings product C8; the first-selected fine scavenging tailings product C8 is subjected to a second fine scavenging selection to obtain a second-selected fine scavenging concentrate product C9 and a second-selected fine scavenging tailings product C10; the second-selected fine scavenging tailings product C10 is subjected to a third fine scavenging selection to obtain a third-selected fine scavenging concentrate product C11 and a third-selected fine scavenging tailings product C12, and the third-selected fine scavenging tailings product C12 is sent to the tailings pond for storage after being concentrated as the final tailings; the first-selected fine scavenging concentrate product C7 is sent to step C.1; the second-selected fine scavenging concentrate product C9 is sent to the first-selected fine scavenging process; and the third-selected fine scavenging concentrate product C11 is sent to the second-selected fine scavenging process.

Images