Beneficiation method for copper-sulfur ore containing pyrrhotite and pyrite

Abstract

The invention discloses a beneficiation method for copper-sulfur ore containing pyrrhotite and pyrite. The beneficiation method specifically comprises the steps of pretreatment, copper concentrate preparation and sulfur concentrate preparation. The method is simple in technological process, easy to operate, energy-saving, environment-friendly and good in applicability. The beneficiation method is used for treating copper-sulfur ore containing pyrrhotite and pyrite, the copper recovery rate is 90% or above, and the copper grade of copper concentrate is 20% or above; the sulfur recovery rate can reach 93% or above, and the sulfur grade is 30% or above; the iron recovery rate can reach 30% or above, and the iron ore concentrate grade is 65% or above.

Description

Technical Field

[0001] The invention relates to the technical field of beneficiation and separation of copper-sulfur ores in metallurgy and chemical industry, and in particular to a beneficiation method for copper-sulfur ores containing pyrrhotite and pyrite. Background Art

[0002] As the economy enters a new stage of high-quality development, the demand for mineral resources such as copper, iron, and sulfur continues to increase. However, with the development and utilization of mineral resources, easy-to-select single ores are becoming less and less. Therefore, it is of great significance to increase the comprehensive utilization of complex and difficult-to-select polymetallic mineral resources.

[0003] The ore properties of pyrrhotite are complex and changeable. Pyrrhotite with different crystal structures has certain differences in the separation properties during mineral processing. For example, the performance in floatability, magnetism, activation or inhibition is different. It is the main factor that interferes with the separation of copper and sulfur and the desulfurization of iron ore in pyrrhotite-type copper-iron polymetallic ores, which increases the difficulty of mineral processing of pyrrhotite-type copper-iron polymetallic ores. In addition, pyrrhotite and pyrite are often associated with chalcopyrite, which intersect and wrap each other, and the floatability of the three is similar. Therefore, it is difficult to separate chalcopyrite from pyrite and pyrrhotite. For complex polymetallic ores, especially copper-iron polymetallic ores containing pyrrhotite, it is of great significance to develop new mineral processing technology. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite.

[0005] The present invention provides a method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite, which specifically comprises the following steps:

[0006] Step 1, pretreatment: lime is added to the copper-sulfur ore containing pyrrhotite and pyrite, the pH is adjusted to 9, and the ore is ground to -0.074 mm, accounting for 70-75%, to obtain material a;

[0007] Step 2, preparation of copper concentrate;

[0008] Step 2.1, copper roughing: adding a collector to material a for flotation to obtain copper roughing ore b and flotation tailings c;

[0009] Step 2.2, primary concentration of copper: adding an inhibitor to the copper rougher ore b for primary concentration to obtain primary concentrated ore d and primary concentrated tailings e, and the primary concentrated tailings e are returned to step 2.1 for copper rougher concentration;

[0010] Step 2.3, secondary copper concentration: adding an inhibitor to the primary concentrated ore d for secondary concentration to obtain copper concentrate and secondary concentrated tailings f, and the secondary concentrated tailings f are returned to step 2.2 for primary copper concentration;

[0011] Step 2.4, primary scavenging of copper: adding a collector to the flotation tailings c for primary scavenging to obtain primary scavenging g and primary scavenging tailings h, and the primary scavenging g is returned to step 2.1 for copper roughing;

[0012] Step 2.5, secondary scavenging of copper: adding a collector to the primary scavenging tailing h for secondary scavenging to obtain secondary scavenging i and secondary scavenging tailing j, and the secondary scavenging i returns to step 2.4 for primary scavenging of copper;

[0013] Step 3, preparing sulfur concentrate;

[0014] Step 3.1, sulfur roughing: adding an activator, a collector and a frother to the secondary scavenging tailings j to perform sulfur roughing to obtain sulfur roughing ore k and sulfur roughing tailings l;

[0015] Step 3.2, sulfur concentration: the sulfur roughing ore k is subjected to blank concentration to obtain sulfur concentrate 1 and concentrated tailings m, and the concentrated tailings m are returned to step 3.1 for sulfur roughing;

[0016] Step 3.3, sulfur primary scavenging: adding an activator, a collector and a frother to the sulfur roughing tailings l for primary scavenging to obtain primary scavenging ore n and primary scavenging tailings o, and the primary scavenging ore n returns to step 3.1 for sulfur roughing;

[0017] Step 3.4, sulfur secondary scavenging: add activator, collector and frother to the primary scavenging tailing o for secondary scavenging to obtain secondary scavenging ore p and secondary scavenging tailing q, and the secondary scavenging ore p returns to step 3.3 sulfur primary scavenging;

[0018] Step 3.5, magnetic separation: subject the secondary scavenging tailings q to magnetic separation to obtain magnetically separated ore r and final tailings;

[0019] Step 3.6, desulfurization roughing: grind the magnetic ore r to -0.074mm, accounting for 83%, and then add an activator, a collector and a frother for desulfurization roughing to obtain flotation ore s and flotation tailings t;

[0020] Step 3.7, primary desulfurization and concentration: the flotation ore s is subjected to primary blank concentration to obtain primary blank concentrated ore u and primary blank concentrated tailings, and the primary blank concentrated tailings are returned to step 3.6 for desulfurization roughing;

[0021] Step 3.8, secondary desulfurization and concentration: the primary blank concentrated ore u is subjected to secondary blank concentration to obtain sulfur concentrate 2 and secondary blank concentrated tailings, and the secondary blank concentrated tailings are returned to step 3.7 for primary desulfurization and concentration;

[0022] Step 3.9, desulfurization scavenging: adding an activator, a collector and a frother to the flotation tailings t for desulfurization scavenging to obtain scavenged ore v and iron concentrate, and the scavenged ore v returns to step 3.6 for desulfurization roughing.

[0023] Furthermore, in step 2.1, in the rough copper selection, the collector is GBT3, the addition amount is 20 g / t, and the rough copper selection time is 1 min; the GBT3 is composed of potassium ethyl xanthate, isobutyl methyl thiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1.

[0024] Furthermore, in step 2.2, in the primary copper concentration, the inhibitor is lime, the addition amount is 300 g / t, and the primary copper concentration time is 3 min; in step 2.3, in the secondary copper concentration, the inhibitor is lime, the addition amount is 200 g / t, and the secondary copper concentration time is 3 min.

[0025] Furthermore, in step 2.4, in the primary copper screening and the secondary copper screening, the collector is GTB3, the addition amount is 10 g / t, and the screening time is 1 min; the GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1.

[0026] Furthermore, in the preparation of sulfur concentrate in step 3, the activator is one or more of sulfuric acid, oxalic acid, and copper sulfate; the collector is one or two of butyl xanthate and isobutyl xanthate; and the foaming agent is one or more of 2# oil, 24K, and pine oil.

[0027] Furthermore, in step 3.1 sulfur crude selection, the amount of activator added is 1300 g / t; the stirring time is 3 min; the amount of collector added is 200 g / t; the stirring time is 1 min; the amount of foaming agent added is 30 g / t; and the stirring time is 1 min.

[0028] Furthermore, in step 3.3, in the primary sulfur sweep, the amount of activator added is 600 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; the stirring time is 1 min; in step 3.4, in the secondary sulfur sweep, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 30 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; the stirring time is 1 min.

[0029] Furthermore, in step 3.5, the magnetic field strength of the magnetic separation is 0.1-0.5T.

[0030] Furthermore, in step 3.6 desulfurization roughing, the amount of activator added is 700 g / t; the stirring time is 3 min; the amount of collector added is 120 g / t; the stirring time is 1 min; the amount of foaming agent added is 20 g / t; and the stirring time is 1 min.

[0031] Furthermore, in step 3.9 desulfurization sweeping, the amount of activator added is 300 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; and the stirring time is 1 min.

[0032] Compared with the existing technology, the present invention has the following beneficial effects:

[0033] The process flow of the invention is simple, easy to operate, energy-saving, environmentally friendly and has good applicability. The ore dressing method processes copper-sulfur ore containing pyrrhotite and pyrite, with a copper recovery rate of more than 90% and a copper concentrate grade of more than 20%; a sulfur recovery rate of more than 93% and a sulfur grade of more than 30%; an iron recovery rate of more than 30% and an iron concentrate grade of more than 65%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a process flow chart of the method. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] This embodiment takes a certain ore sample from Qinghai as the research object, and adopts a copper-sulfur ore dressing method containing pyrrhotite and pyrite, and the specific steps are as follows:

[0038] 1. Properties of the original ore

[0039] A certain ore sample in Qinghai contains 0.48% copper, 43.22% iron and 13.49% sulfur. The main useful minerals are chalcopyrite, pyrite, pyrrhotite and magnetite.

[0040] 2. Ore dressing method

[0041] Step 1, pretreatment: adding 500g / t lime to the copper-sulfur ore containing pyrrhotite and pyrite, adjusting the pH to 9, grinding the ore to -0.074mm accounting for 70-75% to obtain material a;

[0042] Step 2, preparation of copper concentrate;

[0043] Step 2.1, copper roughing: add 20 g / t collector GTB3 to material a, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, stir for 1 min, and flotate to obtain copper roughing ore b and flotation tailings c;

[0044] Step 2.2, primary copper concentration: add 300 g / t of inhibitor lime to the copper rougher concentrate b, stir for 3 min, to obtain primary concentrate d and primary concentrate tailings e, and return the primary concentrate tailings e to step 2.1 for copper rougher concentration;

[0045] Step 2.3, secondary copper concentration: add 200 g / t of lime as an inhibitor to the primary concentrated ore d, stir for 3 min, and obtain copper concentrate and secondary concentrated tailings f. The secondary concentrated tailings f are returned to step 2.2 for primary copper concentration;

[0046] Step 2.4, primary scavenging of copper: add 10 g / t collector GTB3 to the flotation tailings c, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain primary scavenging g and primary scavenging tailings h. The primary scavenging g is returned to step 2.1 for copper roughing;

[0047] Step 2.5, secondary scavenging of copper: add 10 g / t collector GTB3 to the primary scavenging tailing h, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain secondary scavenging i and secondary scavenging tailing j. The secondary scavenging i returns to step 2.4 for primary scavenging of copper;

[0048] Step 3, preparing sulfur concentrate;

[0049] Step 3.1, sulfur roughing: adding activator sulfuric acid, collector butyl xanthate and foaming agent 2# oil to the secondary scavenging tailing j for sulfur roughing to obtain sulfur roughing k and sulfur roughing tailing l; wherein, the amount of activator added is 1300 g / t; the stirring time is 3 min; the amount of collector added is 200 g / t; the stirring time is 1 min; the amount of foaming agent added is 30 g / t; the stirring time is 1 min;

[0050] Step 3.2, sulfur concentration: the sulfur roughing ore k is subjected to blank concentration to obtain sulfur concentrate 1 and concentrated tailings m, and the concentrated tailings m are returned to step 3.1 for sulfur roughing;

[0051] Step 3.3, sulfur primary scavenging: add oxalic acid as an activator, isobutyl xanthate as a collector and 24K as a frother to the sulfur roughing tailing l for primary scavenging to obtain primary scavenging ore n and primary scavenging tailing o, and the primary scavenging ore n returns to step 3.1 for sulfur roughing; wherein, the amount of activator added is 600 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0052] Step 3.4, secondary scavenging of sulfur: add activator copper sulfate, collector butyl xanthate and isobutyl xanthate mixture and frother pine oil to the primary scavenging tailing o for secondary scavenging to obtain secondary scavenging p and secondary scavenging tailing q, and the secondary scavenging p returns to step 3.3 for primary scavenging of sulfur; wherein, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 30 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0053] Step 3.5, magnetic separation: subject the secondary scavenging tailings q to magnetic separation to obtain magnetic separation r and final tailings; wherein the magnetic field intensity of the magnetic separation is 0.2T;

[0054] Step 3.6, desulfurization roughing: grind the magnetic ore r to -0.074mm, accounting for 83%, and then add a mixture of activator sulfuric acid and oxalic acid, a mixture of collector butyl xanthate and isobutyl xanthate, and a mixture of frother 2 oil, 24K and pine oil for desulfurization roughing to obtain flotation ore s and flotation tailings t; wherein, the amount of activator added is 700g / t; the stirring time is 3min; the amount of collector added is 120g / t; the stirring time is 1min; the amount of frother added is 20g / t; the stirring time is 1min;

[0055] Step 3.7, primary desulfurization and concentration: the flotation ore s is subjected to primary blank concentration to obtain primary blank concentrated ore u and primary blank concentrated tailings, and the primary blank concentrated tailings are returned to step 3.6 for desulfurization roughing;

[0056] Step 3.8, secondary desulfurization and concentration: the primary blank concentrated ore u is subjected to secondary blank concentration to obtain sulfur concentrate 2 and secondary blank concentrated tailings, and the secondary blank concentrated tailings are returned to step 3.7 for primary desulfurization and concentration;

[0057] Step 3.9, desulfurization scavenging: add activator oxalic acid, a mixture of collector butyl xanthate and isobutyl xanthate, and a mixture of frother 2# oil, 24K and pine oil to the flotation tailings t for desulfurization scavenging to obtain scavenging v and iron concentrate, and the scavenging v returns to step 3.6 for desulfurization roughing; wherein, the amount of activator added is 300 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; and the stirring time is 1 min.

[0058] By using this process to treat the ore, a copper concentrate with a copper grade of 21.95 and a copper recovery rate of 90.71% can be obtained; after the two sulfur concentrates are combined, the sulfur grade is 33.47%, the sulfur recovery rate is 93.30%, and the iron concentrate has an iron grade of 66.15%, a sulfur grade of 0.13%, and an iron recovery rate of 33.67%, which are good indicators.

[0059] Example 2

[0060] This embodiment takes a certain ore sample from Tibet as the research object, and adopts a copper-sulfur ore dressing method containing pyrrhotite and pyrite, and the specific steps are as follows:

[0061] 1. Properties of the original ore

[0062] A certain ore sample in Tibet contains 0.53% copper, 35.28% iron, and 10.49% sulfur. The main useful minerals are chalcopyrite, pyrite, pyrrhotite, and magnetite.

[0063] 2. Ore dressing method

[0064] Step 1, pretreatment: adding 800g / t lime to the copper-sulfur ore containing pyrrhotite and pyrite, adjusting the pH to 9, grinding the ore to -0.074mm accounting for 70-75% to obtain material a;

[0065] Step 2, preparation of copper concentrate;

[0066] Step 2.1, copper roughing: add 20 g / t collector GTB3 to material a, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, stir for 1 min, and flotate to obtain copper roughing ore b and flotation tailings c;

[0067] Step 2.2, primary copper concentration: add 300 g / t of inhibitor lime to the copper rougher concentrate b, stir for 3 min, to obtain primary concentrate d and primary concentrate tailings e, and return the primary concentrate tailings e to step 2.1 for copper rougher concentration;

[0068] Step 2.3, secondary copper concentration: add 200 g / t of lime as an inhibitor to the primary concentrated ore d, stir for 3 min, and obtain copper concentrate and secondary concentrated tailings f. The secondary concentrated tailings f are returned to step 2.2 for primary copper concentration;

[0069] Step 2.4, primary scavenging of copper: add 10 g / t collector GTB3 to the flotation tailings c, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain primary scavenging g and primary scavenging tailings h. The primary scavenging g is returned to step 2.1 for copper roughing;

[0070] Step 2.5, secondary scavenging of copper: add 10 g / t collector GTB3 to the primary scavenging tailing h, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain secondary scavenging i and secondary scavenging tailing j. The secondary scavenging i returns to step 2.4 for primary scavenging of copper;

[0071] Step 3, preparing sulfur concentrate;

[0072] Step 3.1, sulfur roughing: adding an activator oxalic acid, a collector isobutyl xanthate and a mixture of frother 2# oil and 24K to the secondary scavenging tailing j for sulfur roughing to obtain sulfur roughing k and sulfur roughing tailing l; wherein, the amount of activator added is 1300 g / t; the stirring time is 3 min; the amount of collector added is 200 g / t; the stirring time is 1 min; the amount of frother added is 30 g / t; the stirring time is 1 min;

[0073] Step 3.2, sulfur concentration: the sulfur roughing ore k is subjected to blank concentration to obtain sulfur concentrate 1 and concentrated tailings m, and the concentrated tailings m are returned to step 3.1 for sulfur roughing;

[0074] Step 3.3, sulfur primary scavenging: add a mixture of activator sulfuric acid, oxalic acid and copper sulfate, a collector butyl xanthate and a mixture of frother 2# oil and 24K to the sulfur roughing tailing l for primary scavenging to obtain primary scavenging n and primary scavenging tailing o, and the primary scavenging n returns to step 3.1 sulfur roughing; wherein, the amount of activator added is 600 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0075] Step 3.4, sulfur secondary scavenging: add a mixture of oxalic acid and copper sulfate as an activator, isobutyl xanthate as a collector, and a mixture of 2# oil and 24K as a frother to the primary scavenging tailing o for secondary scavenging to obtain secondary scavenging ore p and secondary scavenging tailing q, and the secondary scavenging ore p returns to step 3.3 for sulfur primary scavenging; wherein, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 30 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0076] Step 3.5, magnetic separation: subject the secondary scavenging tailings q to magnetic separation to obtain magnetic separation r and final tailings; wherein the magnetic field intensity of the magnetic separation is 0.2T;

[0077] Step 3.6, desulfurization roughing: grind the magnetic ore r to -0.074mm, accounting for 83%, and then add a mixture of activator sulfuric acid and copper sulfate, collector butyl xanthate and a mixture of frother 2# oil and 24K for desulfurization roughing to obtain flotation ore s and flotation tailings t; wherein, the amount of activator added is 700g / t; the stirring time is 3min; the amount of collector added is 120g / t; the stirring time is 1min; the amount of frother added is 20g / t; the stirring time is 1min;

[0078] Step 3.7, primary desulfurization and concentration: the flotation ore s is subjected to primary blank concentration to obtain primary blank concentrated ore u and primary blank concentrated tailings, and the primary blank concentrated tailings are returned to step 3.6 for desulfurization roughing;

[0079] Step 3.8, secondary desulfurization and concentration: the primary blank concentrated ore u is subjected to secondary blank concentration to obtain sulfur concentrate 2 and secondary blank concentrated tailings, and the secondary blank concentrated tailings are returned to step 3.7 for primary desulfurization and concentration;

[0080] Step 3.9, desulfurization scavenging: add a mixture of activator sulfuric acid and copper sulfate, collector butyl xanthate and a mixture of frother 2# oil and 24K to the flotation tailings t for desulfurization scavenging to obtain scavenging ore v and iron concentrate, and the scavenging ore v returns to step 3.6 for desulfurization roughing; wherein, the amount of activator added is 300 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; and the stirring time is 1 min.

[0081] By using this process to treat the ore, a copper concentrate with a copper grade of 20.14 and a copper recovery rate of 91.21% can be obtained; after the two sulfur concentrates are combined, the sulfur grade is 32.25%, the sulfur recovery rate is 93.78%, and the iron concentrate has an iron grade of 67.22%, a sulfur grade of 0.16%, and an iron recovery rate of 34.69%, which are good indicators.

[0082] Example 3

[0083] This embodiment takes a certain ore sample from Tibet as the research object, and adopts a copper-sulfur ore dressing method containing pyrrhotite and pyrite, and the specific steps are as follows:

[0084] 1. Properties of the original ore

[0085] A certain ore sample in Yunnan contains 0.61% copper, 39.57% iron, and 18.75% sulfur. The main useful minerals are chalcopyrite, pyrite, pyrrhotite, and magnetite.

[0086] 2. Ore dressing method

[0087] Step 1, pretreatment: adding 1000 g / t lime to the copper-sulfur ore containing pyrrhotite and pyrite, adjusting the pH to 9, grinding the ore to -0.074 mm, accounting for 70-75%, to obtain material a;

[0088] Step 2, preparation of copper concentrate;

[0089] Step 2.1, copper roughing: add 20 g / t collector GTB3 to material a, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, stir for 1 min, and flotate to obtain copper roughing ore b and flotation tailings c;

[0090] Step 2.2, primary copper concentration: add 300 g / t of inhibitor lime to the copper rougher concentrate b, stir for 3 min, to obtain primary concentrate d and primary concentrate tailings e, and return the primary concentrate tailings e to step 2.1 for copper rougher concentration;

[0091] Step 2.3, secondary copper concentration: add 200 g / t of lime as an inhibitor to the primary concentrated ore d, stir for 3 min, and obtain copper concentrate and secondary concentrated tailings f. The secondary concentrated tailings f are returned to step 2.2 for primary copper concentration;

[0092] Step 2.4, primary scavenging of copper: add 10 g / t collector GTB3 to the flotation tailings c, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain primary scavenging g and primary scavenging tailings h. The primary scavenging g is returned to step 2.1 for copper roughing;

[0093] Step 2.5, secondary scavenging of copper: add 10 g / t collector GTB3 to the primary scavenging tailing h, wherein GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:1, and stir for 1 min to obtain secondary scavenging i and secondary scavenging tailing j. The secondary scavenging i returns to step 2.4 for primary scavenging of copper;

[0094] Step 3, preparing sulfur concentrate;

[0095] Step 3.1, sulfur roughing: adding an activator copper sulfate, a collector isobutyl xanthate and a mixture of frother 2# oil and 24K to the secondary scavenging tailing j for sulfur roughing to obtain sulfur roughing k and sulfur roughing tailing l; wherein, the activator addition amount is 1300 g / t; the stirring time is 3 min; the collector addition amount is 200 g / t; the stirring time is 1 min; the frother addition amount is 30 g / t; the stirring time is 1 min;

[0096] Step 3.2, sulfur concentration: the sulfur roughing ore k is subjected to blank concentration to obtain sulfur concentrate 1 and concentrated tailings m, and the concentrated tailings m are returned to step 3.1 for sulfur roughing;

[0097] Step 3.3, sulfur primary scavenging: add oxalic acid as an activator, a mixture of butyl xanthate and isobutyl xanthate as collectors, and frother 24K to the sulfur roughing tailing l for primary scavenging to obtain primary scavenging ore n and primary scavenging tailing o, and the primary scavenging ore n returns to step 3.1 for sulfur roughing; wherein, the amount of activator added is 600 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0098] Step 3.4, secondary scavenging of sulfur: a mixture of activator sulfuric acid and oxalic acid, a collector butyl xanthate, and a mixture of frother 24K and pine oil are added to the primary scavenging tailing o for secondary scavenging to obtain secondary scavenging p and secondary scavenging tailing q, and the secondary scavenging p returns to step 3.3 for primary scavenging of sulfur; wherein, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 30 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min;

[0099] Step 3.5, magnetic separation: subject the secondary scavenging tailings q to magnetic separation to obtain magnetic separation r and final tailings; wherein the magnetic field intensity of the magnetic separation is 0.2T;

[0100] Step 3.6, desulfurization roughing: grind the magnetic ore r to -0.074mm, accounting for 83%, and then add an activator of sulfuric acid, a mixture of oxalic acid and copper sulfate, a collector butyl xanthate, and a frother 2# oil for desulfurization roughing to obtain flotation ore s and flotation tailings t; wherein, the activator addition amount is 700g / t; the stirring time is 3min; the collector addition amount is 120g / t; the stirring time is 1min; the frother addition amount is 20g / t; the stirring time is 1min;

[0101] Step 3.7, primary desulfurization and concentration: the flotation ore s is subjected to primary blank concentration to obtain primary blank concentrated ore u and primary blank concentrated tailings, and the primary blank concentrated tailings are returned to step 3.6 for desulfurization roughing;

[0102] Step 3.8, secondary desulfurization and concentration: the primary blank concentrated ore u is subjected to secondary blank concentration to obtain sulfur concentrate 2 and secondary blank concentrated tailings, and the secondary blank concentrated tailings are returned to step 3.7 for primary desulfurization and concentration;

[0103] Step 3.9, desulfurization scavenging: add activator oxalic acid, collector isobutyl xanthate and foaming agent 2# oil to the flotation tailings t for desulfurization scavenging to obtain scavenging ore v and iron concentrate, and the scavenging ore v returns to step 3.6 for desulfurization roughing; wherein, the amount of activator added is 300g / t; the stirring time is 3min; the amount of collector added is 50g / t; the stirring time is 1min; the amount of foaming agent added is 10g / t; the stirring time is 1min.

[0104] By using this process to treat the ore, a copper concentrate with a copper grade of 22.71 and a copper recovery rate of 90.56% can be obtained; after the two sulfur concentrates are combined, the sulfur grade is 34.33%, the sulfur recovery rate is 92.19%, and the iron concentrate has an iron grade of 67.89%, a sulfur grade of 0.14%, and an iron recovery rate of 35.12%, which are good indicators.

[0105] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite, characterized in that: The specific steps include: Step 1, pretreatment: lime is added to the copper-sulfur ore containing pyrrhotite and pyrite, the pH is adjusted to 9, and the ore is ground to -0.074 mm, accounting for 70-75%, to obtain material a; Step 2, preparation of copper concentrate; Step 2.1, copper roughing: adding a collector to material a for flotation to obtain copper roughing ore b and flotation tailings c; Step 2.2, primary concentration of copper: adding an inhibitor to the copper rougher ore b for primary concentration to obtain primary concentrated ore d and primary concentrated tailings e, and the primary concentrated tailings e are returned to step 2.1 for copper rougher concentration; Step 2.3, secondary copper concentration: adding an inhibitor to the primary concentrated ore d for secondary concentration to obtain copper concentrate and secondary concentrated tailings f, and the secondary concentrated tailings f are returned to step 2.2 for primary copper concentration; Step 2.4, primary scavenging of copper: adding a collector to the flotation tailings c for primary scavenging to obtain primary scavenging g and primary scavenging tailings h, and the primary scavenging g is returned to step 2.1 for copper roughing; Step 2.5, secondary scavenging of copper: adding a collector to the primary scavenging tailing h for secondary scavenging to obtain secondary scavenging i and secondary scavenging tailing j, and the secondary scavenging i returns to step 2.4 for primary scavenging of copper; Step 3, preparing sulfur concentrate; Step 3.1, sulfur roughing: adding an activator, a collector and a frother to the secondary scavenging tailings j to perform sulfur roughing to obtain sulfur roughing ore k and sulfur roughing tailings l; Step 3.2, sulfur concentration: the sulfur roughing ore k is subjected to blank concentration to obtain sulfur concentrate 1 and concentrated tailings m, and the concentrated tailings m are returned to step 3.1 for sulfur roughing; Step 3.3, sulfur primary scavenging: adding an activator, a collector and a frother to the sulfur roughing tailings l for primary scavenging to obtain primary scavenging ore n and primary scavenging tailings o, and the primary scavenging ore n returns to step 3.1 for sulfur roughing; Step 3.4, sulfur secondary scavenging: add activator, collector and frother to the primary scavenging tailing o for secondary scavenging to obtain secondary scavenging ore p and secondary scavenging tailing q, and the secondary scavenging ore p returns to step 3.3 sulfur primary scavenging; Step 3.5, magnetic separation: subject the secondary scavenging tailings q to magnetic separation to obtain magnetically separated ore r and final tailings; Step 3.6, desulfurization roughing: grind the magnetic ore r to -0.074mm, accounting for 83%, and then add an activator, a collector and a frother for desulfurization roughing to obtain flotation ore s and flotation tailings t; Step 3.7, primary desulfurization and concentration: the flotation ore s is subjected to primary blank concentration to obtain primary blank concentrated ore u and primary blank concentrated tailings, and the primary blank concentrated tailings are returned to step 3.6 for desulfurization roughing; Step 3.8, secondary desulfurization and concentration: the primary blank concentrated ore u is subjected to secondary blank concentration to obtain sulfur concentrate 2 and secondary blank concentrated tailings, and the secondary blank concentrated tailings are returned to step 3.7 for primary desulfurization and concentration; Step 3.9, desulfurization scavenging: adding an activator, a collector and a frother to the flotation tailings t for desulfurization scavenging to obtain scavenged ore v and iron concentrate, and the scavenged ore v returns to step 3.6 for desulfurization roughing.

2. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 2.1, in the rough selection of copper, the collector is GBT3, the addition amount is 20 g / t, and the rough selection time of copper is 1 min; the GBT3 is composed of potassium ethyl xanthate, isobutyl methyl thiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:

1.

3. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 2.2, in the primary copper concentration, the inhibitor is lime, the addition amount is 300 g / t, and the primary copper concentration time is 3 min. In step 2.3, in the secondary copper concentration, the inhibitor is lime, the addition amount is 200 g / t, and the secondary copper concentration time is 3 min.

4. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 2.4, in the primary copper screening and the secondary copper screening, the collector is GTB3, the addition amount is 10 g / t, and the screening time is 1 min; the GBT3 is composed of potassium ethyl xanthate, isobutyl methylthiocarbamate, and butyl ammonium black medicine in a ratio of 1:1:

1.

5. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3, in the preparation of sulfur concentrate, the activator is one or more of sulfuric acid, oxalic acid, and copper sulfate; the collector is one or both of butyl xanthate and isobutyl xanthate; and the foaming agent is one or more of 2# oil, 24K, and pine oil.

6. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3.1, during the sulfur coarse selection, the amount of activator added is 1300 g / t; the stirring time is 3 min; the amount of collector added is 200 g / t; the stirring time is 1 min; the amount of foaming agent added is 30 g / t; the stirring time is 1 min.

7. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3.3, during the primary scavenging of sulfur, the amount of activator added is 600 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; the stirring time is 1 min; in step 3.4, during the secondary scavenging of sulfur, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 30 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; the stirring time is 1 min.

8. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3.5, the magnetic field strength of the magnetic separation is 0.1 to 0.5 T.

9. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3.6 desulfurization rough selection, the amount of activator added is 700g / t; the stirring time is 3min; the amount of collector added is 120g / t; the stirring time is 1min; the amount of foaming agent added is 20g / t; the stirring time is 1min.

10. The method for beneficiating copper-sulfur ore containing pyrrhotite and pyrite according to claim 1, characterized in that: In step 3.9 desulfurization sweep, the amount of activator added is 300 g / t; the stirring time is 3 min; the amount of collector added is 50 g / t; the stirring time is 1 min; the amount of foaming agent added is 10 g / t; the stirring time is 1 min.

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