Method for recovering sulfides in copper separation tailings

Abstract

The invention relates to the technical field of mineral separation, in particular to a method for recycling sulfides in copper separation tailings, which comprises the following steps: feeding the copper separation tailings into a thickener for concentration, adjusting the underflow concentration and pH of the thickener, and then feeding the copper separation tailings into subsequent flotation operation; preparing a sulfide collecting agent; and after the obtained sulfide collecting agent is mixed with underflow of a medium thickener, a black powder collecting agent is added for one-time roughing operation, after a certain amount of sulfide collecting agent is added into roughing concentrate, two-time concentration operation is conducted, a certain amount of sulfide collecting agent is added into concentration tailings, three-time scavenging operation is conducted, and final sulfur concentrate and tailings are obtained. The novel collecting agent adopted by the invention can be used for collecting micro-fine sulfide mineral particles and sulfide mineral intergrowth, the content of sulfide in the copper tailings can be effectively reduced, and the flotation recovery rate of Cu and S in the copper tailings is improved.

Description

Technical Field

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

[0002] The sulfide minerals containing valuable elements such as Cu and S in copper tailings are fine in particle size or exist in a state of lean intergrowth with poor floatability. The recovery process basically adopts the regrinding and re-selection process. Due to the high grinding cost and low content of useful minerals, the regrinding process causes high cost of copper tailings re-selection process; at the same time, the tailings after regrinding have too fine particles, which affects the use of non-metallic minerals and makes it difficult to build tailings dams; and some dissociated fine-grained sulfide minerals will be over-grinded, increasing the difficulty of recovery. Therefore, for copper tailings, the regrinding and re-selection process is 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, S in the tailings.

[0004] In order to achieve the above-mentioned purpose of the present invention, the following technical scheme is particularly adopted: a method for recovering sulfides in copper tailings, the recovery method specifically comprises the following steps:

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

[0006] S2) preparing a sulfide collector;

[0007] S3) After the sulfide collector obtained in S2) is mixed with the underflow of the thickener in S1), a black medicine 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.

[0008] Further, 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: oil-soluble petroleum sulfonate, mercaptan and xanthate collector are mixed and stirred at a mass ratio of 1:9:(50-150) at a temperature of 15°C-50°C for 10min-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] Further, 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 5-20g / 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 the method can form a hydrophobic film on the surface of fine-grained sulfide minerals and sulfide mineral-poor intergrowths, and adsorb black medicine collectors at the same time, greatly improving the selectivity and collection capacity of the mixed collector. This helps to float fine-grained sulfide ores into foam products, and is also conducive to the recovery of coarse-grained sulfide ore-poor intergrowths. The recovery of copper and sulfur minerals in tailings cannot be achieved by using the regrinding process. 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 appreciated 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, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] The collector with strong collecting ability and good selectivity is used to strengthen the efficient recovery of fine-grained sulfide minerals and sulfide mineral-poor intergrowths. That is, the coarse concentrate with high recovery rate of valuable elements and tailings with extremely low valuable element content are obtained through non-grinding flotation, and the coarse concentrate is regrinded and re-selected to obtain the concentrate product. Due to the use of regrinding of coarse concentrate, the grinding amount of this technology is greatly reduced, and the beneficiation cost is low.

[0025] The core of the enhanced capture technology of valuable sulfide minerals in copper tailings is that the collector has strong capture ability and certain selectivity. The problem to be solved by the present invention is to optimize the flotation process for enriching sulfide minerals in copper tailings by improving the effect and flotation activity of the thiol collector, improving its capture ability and selectivity.

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

[0027] Example 1

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

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

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

[0031] Among them, the xanthate collector is a mixture of butyl xanthate, amyl xanthate, isobutyl xanthate and isopropyl xanthate in a ratio of 1:1:1:1; the thiol is a mixture of n-dodecyl mercaptan and tert-dodecyl mercaptan in a ratio of 1:1; the oil-soluble petroleum sulfonate is a mixture of oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate 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 50g / t, and then 10g / 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 adding 10g / t of the new collector 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 then fed into subsequent flotation operations after adjusting the underflow concentration and pH of the thickener. The underflow concentration of the thickener is 20% and the pH is 8.

[0036] S2, mixing oil-soluble petroleum sulfonate, mercaptan and xanthate collector in a mass ratio of 1:9:100 at a temperature of 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; 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 adding 15g / t of the new collector 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 then fed into subsequent flotation operations after adjusting the underflow concentration and pH of the thickener. The underflow concentration of the thickener is 24%, and the pH is 8;

[0042] S2, mixing oil-soluble petroleum sulfonate, mercaptan and 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; 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, except that in step S3, all the collectors are butylamine black medicine.

[0047] Comparative Example 2

[0048] The method for recovering sulfides in 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 in 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 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 an oil-soluble calcium petroleum sulfonate and sodium petroleum sulfonate mixed 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 rate and average grade 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 is a detailed introduction to a method for recovering sulfides from copper tailings provided in an embodiment of the present application. The description of the above embodiment is only used to help understand the method and its core idea of ​​the present application; at the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present 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. As mentioned throughout the specification and claims, "including" and "comprising" 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 problem within a certain error range and basically achieve the technical effect. The subsequent description of 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 determined by the definition of the attached claims.

[0057] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0058] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but 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 the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A method for recovering sulfides from copper tailings, characterized in that: The recovery method specifically comprises the following steps: S1) feeding the copper tailings into a thickener for concentration, adjusting the underflow concentration and pH of the thickener, and then feeding it into subsequent flotation operations; S2) preparing a sulfide collector; S3) After the sulfide collector obtained in S2) is mixed with the underflow of the thickener in S1), a black medicine 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, characterized in that: 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 specific preparation process of the sulfide collector in S2) is: oil-soluble petroleum sulfonate, mercaptan and xanthate collector are mixed and stirred at a mass ratio of 1:9:(50-150) at a temperature of 15°C-50°C for 10min-15min to obtain the sulfide collector.

4. The recycling method according to claim 3, 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.

5. The recycling method according to claim 4, characterized in that: In the 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 dosage of the sulfide collector in the two concentration operations is 5-20g / t; The dosage of the sulfide collector in the three sweeping operations is 5-15 g / t.

6. The recycling method according to claim 5, characterized in that: The black medicine collector is one or more of butylamine black medicine and No. 25 black medicine.

7. The recycling method according to claim 1, characterized in that: 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%.

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

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