A flotation separation method for native copper and pyrite

Abstract

A flotation separation method for native copper and pyrite comprises the steps of first rapidly floating pyrite and then floating native copper and preparing reagents, and includes the following process steps and conditions: grinding and classification: dissociating part of pyrite monomers to a fineness of 50-90% and a native copper monomer dissociation degree of 50-70%; rapid flotation of pyrite: adding a frother to the overflow in a stirring barrel to control the rapid flotation time; rough copper selection: adding a copper collector and a frother for natural copper flotation prepared with 40-70 parts of mercaptan, 10-30 parts of alkyl dithiophosphate and 10-30 parts of non-polar hydrocarbon oil to the rapid flotation tailings; copper concentration: subjecting the copper rougher concentrate to two copper concentrations; and copper scavenging: adding a copper collector and a frother for natural copper flotation prepared with the prepared copper collector to the copper rougher tailings. It has the advantages of avoiding the inclusion of pyrite in copper concentrate, improving the natural floatability of native copper by using mercaptan and then combining with reagents to strengthen the stability of the foam layer, thereby achieving effective recovery of native copper.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a method for separating native copper from pyrite. Background Art

[0002] Native copper is one of the forms of copper found in nature, often coexisting with pyrite. Due to the excellent ductility of copper metal, a large number of large flaky particles are easily produced during the grinding process, making it difficult for flotation foam to fully float them. The production process usually requires increasing the dosage of collectors and frothers to ensure copper recovery. When traditional sulfide ore collectors are used for flotation recovery, their floatability is lower than that of copper sulfide ore and is slightly different from that of pyrite. Therefore, when native copper coexists with pyrite, the traditional sulfur-suppressed copper flotation process using low-cost lime as a depressant has problems such as difficulty in separating copper and sulfur, large reagent dosage, high cost, and low copper recovery.

[0003] In order to find a suitable separation process and reagent for native copper and pyrite, our research team searched but found no relevant literature.

[0004] Therefore, it is very urgent and of great significance to develop a flotation separation method for native copper and pyrite. Summary of the Invention

[0005] The task of the present invention is to overcome the existing deficiencies and provide a flotation separation method for native copper and pyrite, which can avoid the inclusion of copper in copper concentrate by pyrite with good floatability and improve the recovery rate of native copper.

[0006] In order to accomplish the above tasks, the present invention adopts the following technical solutions:

[0007] A method for flotation separation of native copper and pyrite, for flotation separation of native copper and pyrite, is to first quickly float pyrite and then float native copper and prepare a reagent, specifically including the following process steps and conditions:

[0008] (1) Grinding and classification: Based on the different particle sizes of the ore, the ore is ground to dissociate part of the pyrite monomer to 50-90%, and then is classified by a cyclone to achieve a fineness of 50-70% of the monomer dissociation degree of natural copper. The grinding fineness is controlled to be stable to obtain sedimentation and overflow;

[0009] (2) Rapid flotation of pyrite: Add 10-50 g / t of frother 2# oil to the overflow obtained in step (1) in a stirring barrel, and control the rapid flotation time to 0.5-2 min to obtain pyrite coarse concentrate and rapid flotation tailings;

[0010] (3) Copper roughing: the quick-floating tailings obtained in step (2) are added in a stirring barrel at a ratio of 10 to 200 g / t to a copper collector for natural copper flotation prepared with 40 to 70 parts of mercaptan, 10 to 30 parts of alkyl dithiophosphate and 10 to 30 parts of non-polar hydrocarbon oil, and 10 to 50 g / t of a 2# oil foaming agent, and copper roughing concentrate and copper roughing tailings are obtained through copper roughing;

[0011] (4) Copper concentration: The copper rougher concentrate obtained in step (3) is subjected to two copper concentrations to obtain copper concentrate and middlings;

[0012] (5) Copper scavenging: 10-200 g / t of the copper roughing tailings obtained in step (3) is added to a copper collector for natural copper flotation prepared with 40-70 parts of mercaptan, 10-30 parts of alkyl dithiophosphate and 10-30 parts of non-polar hydrocarbon oil, and 10-50 g / t of 2# oil foaming agent, and subjected to one scavenging process to obtain copper scavenging concentrate and tailings.

[0013] Compared with the prior art, the present invention has the following beneficial effects or advantages:

[0014] (1) Taking advantage of the fact that some pyrite has better floatability than natural copper, the addition of 2 # The pyrite with good floatability is quickly removed by oil, thus avoiding the inclusion of this part of pyrite with good floatability in the copper concentrate.

[0015] (2) The corrosion effect of mercaptan on the metal surface is fully utilized to form the characteristics of a hydrophobic film, thereby improving the natural floatability of natural copper, especially the large-scale natural copper particles produced by grinding; and then combined with hydrocarbon dithiophosphates and non-polar hydrocarbon oils to enhance the stability of the foam layer and achieve effective recovery of natural copper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is illustrated by the following drawings.

[0017] Figure 1 The present invention provides a method for flotation separation of native copper and pyrite. The present invention provides a method for flotation separation of native copper and pyrite.

[0018] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, the present invention provides a flotation separation method for native copper and pyrite, which is aimed at the flotation separation of native copper and pyrite. It is to quickly float pyrite first and then float native copper and prepare reagents. Specifically, it includes the following process steps and conditions:

[0020] (1) Grinding and classification: Based on the different particle sizes of the ore, the ore is ground to dissociate part of the pyrite monomer to 50-90%, and then is classified by a cyclone to achieve a fineness of 50-70% of the monomer dissociation degree of natural copper. The grinding fineness is controlled to be stable to obtain sedimentation and overflow;

[0021] (2) Rapid flotation of pyrite: Add 10-50 g / t of frother 2# oil to the overflow obtained in step (1) in a stirring barrel, and control the rapid flotation time to 0.5-2 min to obtain pyrite coarse concentrate and rapid flotation tailings;

[0022] (3) Copper roughing: the quick-floating tailings obtained in step (2) are added in a stirring barrel at a ratio of 10 to 200 g / t to a copper collector for natural copper flotation prepared with 40 to 70 parts of mercaptan, 10 to 30 parts of alkyl dithiophosphate and 10 to 30 parts of non-polar hydrocarbon oil, and 10 to 50 g / t of a 2# oil foaming agent, and copper roughing concentrate and copper roughing tailings are obtained through copper roughing;

[0023] (4) Copper concentration: The copper rougher concentrate obtained in step (3) is subjected to two copper concentrations to obtain copper concentrate and middlings;

[0024] (5) Copper scavenging: 10-200 g / t of the copper roughing tailings obtained in step (3) is added to a copper collector for natural copper flotation prepared with 40-70 parts of mercaptan, 10-30 parts of alkyl dithiophosphate and 10-30 parts of non-polar hydrocarbon oil, and 10-50 g / t of 2# oil foaming agent, and subjected to one scavenging process to obtain copper scavenging concentrate and tailings.

[0025] The present invention may further be:

[0026] The non-polar hydrocarbon oils in steps (3) and (5) are any one or more mixtures of cycloalkanes, paraffins, and olefins.

[0027] The sedimented sand in step (1) is returned to the grinding and classification step for re-grinding.

[0028] The middlings from step (3) and the copper scavenging concentrate from step (5) are returned to the copper roughing step for reselection.

[0029] Example 1

[0030] A concentrator processed copper ore with a copper grade of 0.15%, of which 81.52% was in the form of native copper. The sulfur content reached 2.55%, with over 90% of this present as pyrite. A process using lime as a depressant, Z200 as a copper flotation collector, and 2# oil as a frother prioritized copper flotation. However, due to the difficulty in floating some large (+0.2mm) native copper flakes produced by grinding, and the similar flotability of native copper to pyrite, lime inhibition and separation proved difficult, hindering improvements in copper grade and recovery.

[0031] Use Figure 1 The process flow and pharmaceutical system transformation shown in the figure are implemented in the following steps:

[0032] (1) Grinding operation: After a period of grinding and classification, the ore has a grinding fineness of -0.074mm70% and overflows into the mixing barrel.

[0033] (2) Rapid flotation of pyrite: The overflow obtained in step (1) was added to a stirring barrel with 50 g / t of frother 2# oil to perform rapid flotation of pyrite, with a rapid flotation time of 1 min.

[0034] (3) Copper flotation operation: 50 g / t of natural copper flotation reagent and 50 g / t of frother 2# oil were added to the fast-floating tailings obtained in step (2) in a stirring barrel, and a copper concentrate was obtained by flotation.

[0035] (4) Copper concentration operation: The copper rough concentrate obtained in step (3) is subjected to two concentrations to obtain copper concentrate; the flotation middlings are concentrated and returned to the rougher.

[0036] (5) Copper scavenging operation: The copper roughing tailings obtained in step (3) are added with 30 g / t of copper flotation reagent and 50 g / t of frother 2# oil. After a scavenging operation, the scavenged concentrate is returned to the flotation.

[0037] Comparative Example 1

[0038] The ore sample of Example 1 was used, Z200 was used as the collector, 2# oil was used as the frother, lime was used as the depressant, and the copper flotation process was "one coarse, two fine, and one sweep", wherein the dosage of the reagents was consistent with that of Example 1.

[0039] Example 2

[0040] The copper grade of the ore is 0.37%, of which native copper accounts for 75% and the sulfur content is 3.78%.

[0041] Use Figure 1 The process flow and pharmaceutical system transformation shown in the figure are implemented in the following steps:

[0042] (1) Grinding operation: After a period of grinding and classification, the ore has a grinding fineness of -0.074mm75% and overflows into the mixing barrel.

[0043] (2) Rapid flotation of pyrite: 40 g / t of frother was added to the overflow obtained in step (1) in a stirring barrel, and rapid flotation of pyrite was performed with a rapid flotation time of 1 min.

[0044] (3) Copper flotation operation: The fast-floating tailings obtained in step (2) are added to a stirring barrel with 65 g / t of natural copper flotation reagent and 50 g / t of frother 2# oil, and a copper concentrate is obtained through roughing.

[0045] (4) Copper concentration operation: The copper rough concentrate obtained in step (3) is subjected to two concentrations to obtain copper concentrate; the flotation middlings are concentrated and returned to the roughing operation.

[0046] (5) Copper scavenging operation: The copper roughing tailings obtained in step (3) are added with 35 g / t of copper flotation reagent and 50 g / t of frother 2# oil. After a scavenging operation, the scavenged concentrate is returned to the roughing operation.

[0047] Comparative Example 2

[0048] The ore sample of Example 1 was used, butyl xanthate was used as a collector, 2# oil was used as a frother, lime was used as a depressant, and the copper flotation process was "one coarse, two fine, and one sweep", wherein the dosage of the reagents was consistent with that of Example 1.

[0049] The flotation indexes of the embodiment and the comparative example are shown in Table 1

[0050] Table 1 Flotation indexes of the embodiments and comparative examples

[0051]

[0052]

[0053] Table 1 shows that, although a small amount of copper is lost in the pyrite coarse concentrate by adopting the technical solution of the present invention, compared with the lime inhibition process, the flotation of natural copper minerals can be well achieved, so the copper grade and recovery rate in the copper concentrate are significantly improved.

[0054] The above embodiments are only preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A flotation separation method for native copper and pyrite, which addresses the problems of difficulty in separating copper and sulfur, large amount of reagents, high cost and low copper recovery rate in the flotation separation of native copper and pyrite, characterized by Firstly, quickly float pyrite and then float native copper and prepare reagents. The specific process steps and conditions include: (1) Grinding and classification: Based on the different particle sizes of the ore, the ore is ground to dissociate part of the pyrite monomer to 50-90%, and then the ore is classified by a cyclone to achieve a fineness of 50-70% of the monomer dissociation degree of natural copper. The grinding fineness is controlled to be stable to obtain sedimentation and overflow; (2) Rapid flotation of pyrite: Add 10-50 g / t of frother 2# oil to the overflow obtained in step (1) in a stirring barrel, and control the rapid flotation time to 0.5-2 min to obtain pyrite coarse concentrate and rapid flotation tailings; (3) Copper roughing: the quick-floating tailings obtained in step (2) are added in a stirring barrel at a ratio of 10 to 200 g / t to a copper collector for natural copper flotation prepared with 40 to 70 parts of mercaptan, 10 to 30 parts of alkyl dithiophosphate and 10 to 30 parts of non-polar hydrocarbon oil, and 10 to 50 g / t of a 2# oil foaming agent, and copper roughing concentrate and copper roughing tailings are obtained through copper roughing; (4) Copper concentration: The copper rougher concentrate obtained in step (3) is subjected to two copper concentrations to obtain copper concentrate and middlings; (5) Copper scavenging: 10-200 g / t of the copper roughing tailings obtained in step (3) is added with a copper collector for natural copper flotation prepared with 40-70 parts of mercaptan, 10-30 parts of hydrocarbon dithiophosphate and 10-30 parts of non-polar hydrocarbon oil, and 10-50 g / t of 2# oil foaming agent, and subjected to one scavenging process to obtain copper scavenging concentrate and tailings.

2. The method according to claim 1, wherein The non-polar hydrocarbon oils in steps (3) and (5) are any one or more mixtures of cycloalkanes, paraffins, and olefins.

3. The method according to claim 1, wherein The sedimented sand in step (1) is returned to the grinding and classification step for re-grinding.

4. The method according to claim 1 or 2, wherein The middlings from step (3) and the copper scavenging concentrate from step (5) are returned to the copper roughing step for reselection.

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