A method for recovering sulfides from copper tailings

Abstract

The present invention relates to the field of mineral processing technology, and in particular to a method for recovering sulfides from copper tailings. The recovery method comprises the following steps: feeding the copper tailings into a thickener for concentration, adjusting the concentration and pH of the thickener underflow, and then feeding the tailings into a subsequent flotation operation; preparing a sulfide collector; mixing the obtained sulfide collector with the underflow of the intermediate thickener, and then adding a black drug collector to perform a roughing operation; adding a certain amount of sulfide collector to the roughing concentrate and then performing two cleaning operations; adding a certain amount of sulfide collector to the cleaned tailings and performing three scavenging operations to obtain a final sulfur concentrate and tailings. The novel collector used in the present invention can be used to capture fine sulfide mineral particles and sulfide mineral intergrowths, effectively reducing the sulfide content in the copper tailings and improving the flotation recovery rate of Cu and S in the copper tailings.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for recovering sulfides from copper tailings. Background Art

[0002] Sulfide minerals containing valuable elements like Cu and S in copper tailings are finely sized or exist in a poorly intergrowthed state, resulting in poor floatability. Their recovery typically relies on regrinding and re-selection. Due to the high cost of grinding and the low content of useful minerals, regrinding results in high costs for copper tailings re-selection. Furthermore, the fineness of the regrinded tailings affects the usefulness of the non-metallic minerals and complicates the construction of tailings dams. Furthermore, some dissociated fine-grained sulfide minerals can be over-grinded, making recovery more difficult. Therefore, regrinding and re-selection processes are difficult to apply to the comprehensive utilization of copper tailings. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for recovering sulfides in copper tailings, which adopts a synthetic new collector to improve the flotation recovery rate of Cu and S in copper tailings and reduce the content of elements such as Cu, Fe and S in the tailings.

[0004] In order to achieve the above-mentioned object of the present invention, the following technical scheme is specially adopted: a method for recovering sulfides from copper tailings, the recovery method specifically comprising the following steps:

[0005] S1) feeding the copper tailings into a thickener for concentration, adjusting the underflow concentration and pH of the thickener before feeding into subsequent flotation operations;

[0006] S2) preparing a sulfide collector;

[0007] S3) After mixing the sulfide collector obtained in S2) with the underflow of the thickener in S1), a black powder collector is added to perform a roughing operation. After adding a certain amount of sulfide collector to the roughing concentrate, two cleaning operations are performed. After adding a certain amount of sulfide collector to the cleaned tailings, three scavenging operations are performed to obtain the final sulfur concentrate and tailings.

[0008] Furthermore, the copper tailings in S1) have a Cu content of 0.10% to 0.30% and a S content of 13.0% to 22.0%;

[0009] The thickener underflow concentration is 18%-26%, and the pH value is 7.0-7.5.

[0010] Furthermore, the specific preparation process of the sulfide collector in S2) is: mixing oil-soluble petroleum sulfonate, mercaptan and xanthate collector in a mass ratio of 1:9:(50-150) at a temperature of 15°C to 50°C and stirring for 10min to 15min to obtain the sulfide collector.

[0011] Furthermore, the xanthate collector is one or more of butyl xanthate, amyl xanthate, isobutyl xanthate, and isopropyl xanthate;

[0012] The mercaptan is one or more of n-dodecyl mercaptan and tert-dodecyl mercaptan;

[0013] The oil-soluble petroleum sulfonate is one or more of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate.

[0014] Furthermore, the dosage of the sulfide collector in the roughing operation in S3) is 40-60 g / t; the dosage of the black medicine collector is 5-15 g / t;

[0015] The dosage of the sulfide collector in the two concentration operations is 5-20 g / t;

[0016] The dosage of the sulfide collector in the three sweeping operations is 5-15 g / t.

[0017] Furthermore, the black medicine collector is one or more of butylamine black medicine and No. 25 black medicine.

[0018] Furthermore, the grade of the sulfur concentrate in the recovery method is not less than 49.51%, and the sulfur recovery rate is not less than 91.85%.

[0019] A sulfur concentrate is obtained by adopting the above recovery method.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a method for recovering sulfides from copper tailings. The sulfide collector in this method forms a hydrophobic film on the surfaces of fine-grained sulfide minerals and sulfide-mineral intergrowths, while simultaneously adsorbing a black drug-type collector, significantly improving the selectivity and capture capacity of the mixed collector. This facilitates the flotation of fine-grained sulfide minerals into a froth product and also facilitates the recovery of coarse-grained sulfide-mineral intergrowths. Regrinding is not sufficient to achieve the recovery of copper and sulfur minerals from tailings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flowchart of a method for recovering sulfides from copper tailings. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[0024] This technology utilizes collectors with strong capture capacity and good selectivity to enhance the efficient recovery of fine-grained sulfide minerals and sulfide-poor intergrowths. This technology utilizes non-grinding flotation to produce a coarse concentrate with a high recovery of valuable elements and tailings with extremely low valuable element content. The coarse concentrate is then regrinded and re-selected to produce a concentrate product. This technology significantly reduces grinding volume and lowers beneficiation costs due to the regrinding of the coarse concentrate.

[0025] The core of the enhanced capture technology for valuable sulfide minerals in copper tailings lies in the strong capture ability and selectivity of the collector. The problem addressed by this invention is to optimize the flotation process for enriching sulfide minerals in copper tailings by enhancing the action and flotation activity of the thiol collector, thereby increasing its capture ability and selectivity.

[0026] In some embodiments of the present invention, a method for recovering sulfides from copper tailings is provided, comprising the following steps:

[0027] Example 1

[0028] like Figure 1 The present invention provides a method for recovering sulfides from copper tailings, comprising the following steps:

[0029] S1. The copper tailings are fed into a thickener for concentration, and the underflow concentration and pH of the thickener are adjusted before feeding into subsequent flotation operations. The underflow concentration of the thickener is 26%, and the pH is 7.

[0030] S2. Mixing an oil-soluble petroleum sulfonate, a mercaptan, and a xanthate collector in a mass ratio of 1:9:150 at 50° C. and stirring for 15 minutes to obtain a sulfide collector;

[0031] The xanthate collector comprises butyl xanthate, amyl xanthate, isobutyl xanthate and isopropyl xanthate mixed in a ratio of 1:1:1:1; the thiol comprises n-dodecyl mercaptan and tert-dodecyl mercaptan mixed in a ratio of 1:1; and the oil-soluble petroleum sulfonate comprises oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate mixed in a ratio of 2:1.

[0032] S3. After the new collector in S2 is mixed with the underflow of the thickener in S1, the dosage of the new collector is 50 g / t, and then 10 g / t of butylamine black powder is added to carry out a roughing operation. After a certain amount of 5 g / t of the new collector is added to the roughing concentrate, two cleaning operations are carried out. After 10 g / t of the new collector is added to the cleaned tailings, three scavenging operations are carried out to obtain the final sulfur concentrate and tailings.

[0033] Example 2

[0034] The present invention provides a method for recovering sulfides in copper tailings, comprising the following steps:

[0035] S1. The copper tailings are fed into a thickener for concentration, and the underflow concentration and pH of the thickener are adjusted before feeding into subsequent flotation operations. The underflow concentration of the thickener is 20%, and the pH is 8.

[0036] S2. Mixing an oil-soluble petroleum sulfonate, a mercaptan, and a xanthate collector in a mass ratio of 1:9:100 at 45° C. and stirring for 10 minutes to obtain a sulfide collector;

[0037] Among them, the xanthate collector is a mixture of butyl xanthate, amyl xanthate, isobutyl xanthate, and isopropyl xanthate in a ratio of 1:1:1:2; the thiol is a mixture of n-dodecyl mercaptan and tert-dodecyl mercaptan in a ratio of 2:1; and the oil-soluble petroleum sulfonate is a mixture of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate in a ratio of 3:1.

[0038] S3. After the new collector in S2 is mixed with the underflow of the thickener in S1, the dosage of the new collector is 60g / t, and then 15g / t of butylamine black powder is added to carry out a roughing operation. After a certain amount of 10g / t of the new collector is added to the roughing concentrate, two cleaning operations are carried out. After 15g / t of the new collector is added to the cleaned tailings, three scavenging operations are carried out to obtain the final sulfur concentrate and tailings.

[0039] Example 3

[0040] The present invention provides a method for recovering sulfides in copper tailings, comprising the following steps:

[0041] S1. The copper tailings are fed into a thickener for concentration, and the underflow concentration and pH of the thickener are adjusted before feeding into subsequent flotation operations. The underflow concentration of the thickener is 24%, and the pH is 8.

[0042] S2. Mixing an oil-soluble petroleum sulfonate, a mercaptan, and a xanthate collector in a mass ratio of 1:9:80 at 45° C. and stirring for 10 minutes to obtain a sulfide collector;

[0043] Among them, the xanthate collector is a mixture of butyl xanthate, amyl xanthate, isobutyl xanthate, and isopropyl xanthate in a ratio of 1:1:2:2; the thiol is a mixture of n-dodecyl mercaptan and tert-dodecyl mercaptan in a ratio of 3:1; and the oil-soluble petroleum sulfonate is a mixture of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate in a ratio of 5:1.

[0044] S3. After the new collector in S2 is mixed with the underflow of the thickener in S1, the dosage of the new collector is 48g / t, and then 12g / t of butylamine black powder is added to carry out a roughing operation. After a certain amount of 5g / t of the new collector is added to the roughing concentrate, two cleaning operations are carried out. After 5g / t of the new collector is added to the cleaned tailings, three scavenging operations are carried out to obtain the final sulfur concentrate and tailings.

[0045] Comparative Example 1

[0046] The method for recovering sulfides from copper tailings provided in this comparative example refers to Example 1, with the only difference being that, in step S3, all the collecting agents are butylamine black medicine.

[0047] Comparative Example 2

[0048] The method for recovering sulfides from copper tailings provided in this comparative example refers to Example 1, with the only difference being that, in step S2, the collector is an oil-soluble petroleum sulfonate and a mercaptan prepared in a ratio of 1:9, the mercaptan is a mixture of n-dodecyl mercaptan and tert-dodecyl mercaptan in a ratio of 1:1; and the oil-soluble petroleum sulfonate is a mixture of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate in a ratio of 2:1.

[0049] Comparative Example 3

[0050] The method for recovering sulfides from copper tailings provided in this comparative example refers to Example 1, except that, in step S2, the collector is an oil-soluble petroleum sulfonate and a xanthate collector prepared in a ratio of 1:150, and the xanthate collector includes butyl xanthate, amyl xanthate, isobutyl xanthate, and isopropyl xanthate mixed in a ratio of 1:1:1:1; the oil-soluble petroleum sulfonate is obtained by mixing oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate in a ratio of 2:1.

[0051] Test Example 1

[0052] In the methods for recovering sulfides from copper tailings in Examples 1 to 3 and Comparative Examples 1 to 3, the recovery rates and average grades of sulfur are shown in Table 1.

[0053] Table 1

[0054] Ore grade% Sulfur concentrate grade% Sulfur recovery rate (%) Example 1 19.18 49.51 99.65 Example 2 15.18 50.92 91.85 Example 3 21.74 50.65 94.87 Comparative Example 1 15.41 49.41 84.16 Comparative Example 2 16.80 50.51 87.34 Comparative Example 3 20.11 49.11 90.26 .

[0055] The above describes in detail a method for recovering sulfides from copper tailings provided in the examples of this application. The description of the above examples is intended only to facilitate understanding of the method and core concept of this application. Furthermore, those skilled in the art will appreciate that variations in the specific implementation and scope of application may occur based on the concepts of this application. In summary, this description should not be construed as limiting this application.

[0056] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be as defined in the attached claims.

[0057] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0058] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0059] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A method for recovering sulfides from copper tailings, characterized in that: The recovery method specifically comprises the following steps: S1) Feed the copper tailings into the thickener for concentration, adjust the underflow concentration and pH of the thickener, and then feed it into the subsequent flotation operation; S2) preparing a sulfide collector; The specific preparation process of the sulfide collector is as follows: oil-soluble petroleum sulfonate, mercaptan and xanthate collector are mixed in a mass ratio of 1:9:(50-150) at a temperature of 15°C to 50°C and stirred for 10 minutes to 15 minutes to obtain the sulfide collector; S3) After the sulfide collector obtained in S2) is mixed with the underflow of the medium thickener in S1), a black powder collector is added to perform a roughing operation. After a certain amount of sulfide collector is added to the roughing concentrate, two cleaning operations are performed. After a certain amount of sulfide collector is added to the cleaned tailings, three scavenging operations are performed to obtain the final sulfur concentrate and tailings.

2. The recycling method according to claim 1, wherein: The copper tailings in S1) contain 0.10% to 0.30% Cu and 13.0% to 22.0% S; The thickener underflow concentration is 18%-26%, and the pH value is 7.0-7.

5.

3. The recycling method according to claim 1, characterized in that The xanthate collector is one or more of butyl xanthate, amyl xanthate, isobutyl xanthate, and isopropyl xanthate; The mercaptan is one or more of n-dodecyl mercaptan and tert-dodecyl mercaptan; The oil-soluble petroleum sulfonate is one or more of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate.

4. The recycling method according to claim 1, characterized in that S3) The dosage of the sulfide collector in a roughing operation is 40-60g / t; the dosage of the black medicine collector is 5-15g / t; The two beneficiation operations in the amount of sulfide collector is 5-20g / t; The dosage of the sulfide collector in the three sweeping operations is 5-15 g / t.

5. The recycling method according to claim 1, wherein: The black medicine collector is one or more of butylamine black medicine and No. 25 black medicine.

6. The recycling method according to claim 1, characterized in that The sulfur concentrate grade in the recovery method is not less than 49.51%, and the sulfur recovery rate is not less than 91.85%.

7. A sulfur concentrate, characterized in that: The sulfur concentrate is obtained by the recovery method according to any one of claims 1 to 6.

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