A step-by-step enhanced recovery method for recovering multiple complex copper ores

Abstract

The present invention discloses a step-by-step enhanced recovery method for recovering multiple complex copper ores. The method includes grinding the sample to an appropriate particle size, then directly flotating copper sulfide using amyl xanthate. The tailings from the flotation of the copper sulfide are then deslimed. After desliming, the tailings are activated with sodium sulfide and free copper oxide is flotated using amyl xanthate and butyl ammonium black powder as collectors. Ethylenediamine phosphate is then used for enhanced activation, followed by the addition of sodium sulfide and amyl xanthate and butyl ammonium black powder as collectors to flotate bound copper oxide. Finally, high-gradient strong magnetic separation is used to recover weakly magnetically bound copper oxide that is difficult to float and contains adsorbed or fine particles of iron, manganese, cobalt, and other minerals. The method achieves a total copper recovery rate exceeding 85%, which is more than ten percentage points higher than the global average recovery rate for copper oxide ores. This method effectively addresses the current technical problem of low recovery rates for copper oxide ores using a single process.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a step-by-step enhanced recovery method for recovering multiple complex copper ores. Background Art

[0002] Copper oxide is primarily produced through the long-term oxidation reaction of copper sulfide deposits. Copper oxide ores typically contain azurite / chalcocite, malachite, chrysocolla, cuprite, and other bound copper oxides. Copper oxide ores are highly complex, with high slime content, a wide variety of copper minerals, and widely varying floatability. The copper oxides themselves typically have a highly hydrophilic surface, high oxidation and binding rates, and are often adsorbed by useful minerals or contain fine particles of iron, manganese, cobalt, and other minerals. This complicates the flotation of copper oxide ores and contributes to the persistent problem of low recovery rates. To comprehensively utilize these complex copper oxide ores, mineral processing experts have developed numerous beneficiation approaches, including direct flotation, sulfide flotation, sulfide flotation combined with acid leaching, acid leaching, separation, and combined beneficiation and smelting processes. Different properties of copper oxide ores require different optimal processing technologies. Current copper oxide beneficiation processes are generally focused on one or two copper ores, with relatively few processes addressing the comprehensive recovery of multiple copper ores. This makes it difficult to achieve the goal of comprehensive recovery of multiple copper ores. Therefore, it is essential to conduct research and development to enhance the efficient, step-by-step recovery of multiple copper ores, tailored to the beneficiation characteristics of each copper oxide ores. This is crucial for improving the comprehensive recovery rate of multiple complex copper oxide ores. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention aims to provide a step-by-step enhanced recovery method for recovering multiple complex copper ores.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A step-by-step intensified recovery method for recovering multiple complex copper ores comprises the following steps:

[0006] A. Copper sulfide flotation: After the raw ore is ground, the slurry ground to the target particle size is added with a collector, amyl xanthate, and a frother, No. 2 oil, for copper sulfide roughing. The rougher tailings from the copper sulfide roughing process are sent to the copper sulfide scavenging process, and the rougher concentrate from the copper sulfide roughing process is sent to the copper sulfide concentrating process. The final concentrate obtained from the copper sulfide concentrating process is the copper sulfide concentrate, and the final scavenging tailings from the copper sulfide scavenging process are transferred to step B for processing.

[0007] B. Desliming: The scavenged tailings obtained in step A are deslimed by a cyclone, and the deslimed ore enters step C for treatment;

[0008] C. Free-oxidation copper flotation: The ore obtained in step B is dispersed with sodium fluorosilicate as a dispersant, activated with sodium sulfide, and then amyl xanthate, butyl ammonium black powder and 2# oil are added. The ore then enters the free-oxidation copper roughing operation. The roughing concentrate obtained from the free-oxidation copper roughing operation enters the free-oxidation copper concentrating operation, and the roughing tailings obtained from the free-oxidation copper roughing operation enter the free-oxidation copper scavenging operation. The final concentrated concentrate obtained from the free-oxidation copper concentrating operation is the copper oxide concentrate 1, and the final scavenging tailings obtained from the free-oxidation copper scavenging operation enter the treatment of step D.

[0009] D. Combined copper oxide flotation: The scavenging tailings obtained from the free copper oxide scavenging are activated with ethylenediamine phosphate, and then sodium sulfide, amyl xanthate, butyl ammonium black powder and 2# oil are added to carry out combined copper oxide roughing. The roughing concentrate obtained from the combined copper oxide roughing is subjected to the combined copper oxide concentrating operation, and the roughing tailings obtained from the combined copper oxide roughing are subjected to the combined copper oxide scavenging operation. The concentrated concentrate obtained from the combined copper oxide concentrating operation is the second copper oxide concentrate, and the scavenging tailings obtained from the combined copper oxide scavenging operation are subjected to the treatment of step E.

[0010] E. Magnetic combination with strong magnetic separation of copper oxide: The scavenging tailings obtained by combining copper oxide scavenging are subjected to high gradient strong magnetic separation to obtain copper oxide concentrate 3 and final tailings.

[0011] Furthermore, in step A, one copper sulfide roughing, one copper sulfide scavenging and four copper sulfide concentrations are carried out; the concentrated tailings obtained in the first stage of copper sulfide concentration are returned to the copper sulfide roughing, and the concentrated tailings obtained in the remaining stages of copper sulfide concentration are returned to the previous stage of copper sulfide concentration in sequence, and the concentrated concentrate obtained in each stage of copper sulfide concentration enters the next stage of copper sulfide concentration, and the concentrated copper sulfide concentrate obtained in the last stage of copper sulfide concentration is a high-grade copper sulfide concentrate.

[0012] Furthermore, in step A, based on the dry weight of each ton of raw ore, 40 g / t of amyl xanthate as a collector and 30 g / t of 2# oil as a foaming agent are added in the copper sulfide roughing; and 20 g / t of amyl xanthate is added in the copper sulfide scavenging.

[0013] Furthermore, in step C, one free-oxidation copper roughing, two free-oxidation copper scavengings and one free-oxidation copper concentrating are carried out; the concentrating tailings obtained from the free-oxidation copper concentrating are returned to the free-oxidation copper roughing operation in sequence; the scavenged ore obtained from the first-stage free-oxidation copper scavenging is returned to the free-oxidation copper roughing operation in sequence, and the scavenged ore obtained from the second-stage free-oxidation copper scavenging is returned to the first-stage free-oxidation copper scavenging operation in sequence; the scavenged tailings obtained from the first-stage free-oxidation copper scavenging enter the second-stage free-oxidation copper scavenging operation, and the scavenged tailings obtained from the second-stage free-oxidation copper scavenging enter the treatment of step D.

[0014] Furthermore, in step C, before activation with sodium sulfide, sodium fluorosilicate as a dispersant is added to the ore sand obtained in step B; sodium sulfide, amyl xanthate and butyl ammonium xanthate are added to both the free-oxidized copper selection and the free-oxidized copper scavenging.

[0015] Furthermore, in step C, 300 g / t of sodium fluorosilicate and 2400 g / t of sodium sulfide are added to the ore sand as dispersants based on the dry ore weight per ton of raw ore; 160 g / t of amyl xanthate collectors, 40 g / t of butyl ammonium black powder and 30 g / t of 2# oil as a foaming agent are added in the roughing of free-oxidized copper; 100 g / t of sodium sulfide, 10 g / t of amyl xanthate and 4 g / t of butyl ammonium black powder are added in the concentration of free-oxidized copper; the dosage of the reagents for the first-stage free-oxidized copper scavenging is 800 g / t of sodium sulfide, 80 g / t of amyl xanthate and 20 g / t of butyl ammonium black powder, and the dosage of the reagents for the second-stage free-oxidized copper scavenging is 300 g / t of sodium sulfide, 20 g / t of amyl xanthate and 10 g / t of butyl ammonium black powder.

[0016] Furthermore, in step D, one combined copper oxide roughing, two combined copper oxide scavenging and two combined copper oxide concentrating are carried out; the concentrating tailings obtained from the first-stage combined copper oxide concentrating are sequentially returned to the combined copper oxide roughing operation, the concentrating tailings obtained from the second-stage combined copper oxide concentrating are sequentially returned to the first-stage combined copper oxide concentrating operation, and the concentrating concentrate obtained from the first-stage combined copper oxide concentrating enters the second-stage combined copper oxide concentrating operation; the scavenged ore obtained from the first-stage combined copper oxide scavenging is sequentially returned to the combined copper oxide roughing operation, the scavenged ore obtained from the second-stage combined copper oxide scavenging is sequentially returned to the first-stage combined copper oxide scavenging operation, the scavenged tailings obtained from the first-stage combined copper oxide scavenging enter the second-stage combined copper oxide scavenging operation, and the scavenged tailings obtained from the second-stage combined copper oxide scavenging enter the treatment of step E.

[0017] Furthermore, in step D, the scavenging tailings obtained by scavenging free copper oxide are first activated by 200 g / t of ethylenediamine phosphate and 400 g / t of sodium sulfide, based on the dry weight of each ton of raw ore; in the combined copper oxide roughing, 30 g / t of amyl xanthate, 10 g / t of butyl ammonium black powder and 10 g / t of 2# oil are added as collectors; the dosage of the reagents used in the first stage combined copper oxide selection is 100 g / t of sodium sulfide, 10 g / t of amyl xanthate and The dosage of butyl ammonium black powder is 5g / t, and the dosage of the second-stage combined copper oxide selection reagent is 100g / t of sodium sulfide, 10g / t of amyl xanthate and 4g / t of butyl ammonium black powder; the dosage of the first-stage combined copper oxide scavenging reagent is 300g / t of sodium sulfide, 20g / t of amyl xanthate and 10g / t of butyl ammonium black powder, and the dosage of the second-stage combined copper oxide scavenging reagent is 200g / t of sodium sulfide, 20g / t of amyl xanthate and 10g / t of butyl ammonium black powder.

[0018] The beneficial effects of the present invention are as follows: the method primarily addresses the differences in the properties of different copper minerals. Copper sulfide and different copper oxide ores are separated by a step-by-step flotation process, which can reduce the inhibitory effect of sodium sulfide on copper sulfide while simultaneously obtaining a high-grade copper sulfide concentrate. Free copper oxide is directly activated by flotation with sodium sulfide and a combined collector to obtain a high-grade copper oxide concentrate. Bound copper oxide, which is difficult to flotate, is activated with ethylenediamine phosphate and then recovered by flotation with sodium sulfide and a combined collector. Weakly magnetic bound copper oxide, which is adsorbed or finely mixed with iron, manganese, cobalt, and other minerals, is recovered by strong magnetic separation. The method of the present invention utilizes different processes for step-by-step intensified separation of copper ores containing multiple copper mineral types, achieving the goal of efficient and comprehensive recovery of different copper ores. This results in an innovative mineral processing process for these difficult-to-separate copper oxide ores. The total copper recovery rate of the present invention can reach over 85%, which is more than ten percentage points higher than the global average recovery rate for copper oxide ores, effectively resolving the current technical problem of low recovery rates for copper oxide ores from a single process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 and 2 are process flow charts of embodiments 1 and 2 of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0021] Example 1

[0022] A certain raw ore is an oxide copper ore, containing 6.05% copper and 0.18% sulfur. The main gangue is quartz (68.11%), followed by calcite, dolomite, apatite, etc. The copper minerals are numerous, including oxide copper minerals such as malachite (6.5%), chrysocolla (3.9%), and pseudomalachite (0.05%), as well as copper sulfide (0.96%). Cu is primarily found in malachite, followed by chrysocolla and copper sulfide, with some copper being dispersed in other minerals (including manganese-cobalt-copper silicate ore, limonite, and psilomelane).

[0023] This embodiment provides a step-by-step enhanced recovery method for recovering multiple complex copper ores, such as Figure 1 As shown, the following steps are included:

[0024] A. Copper sulfide flotation: Based on the dry weight of each ton of raw ore, after grinding, the raw ore is ground to -74μm with a fineness of 65%, and 40g / t of amyl xanthate as a collector and 30g / t of 2# oil as a foaming agent are added to the pulp for a copper sulfide roughing. The obtained copper sulfide roughing concentrate is subjected to four copper sulfide concentrating operations. The selected tailings obtained from the first stage of copper sulfide concentrating are returned to the copper sulfide roughing operation. The selected tailings obtained from the remaining stages of copper sulfide concentrating are returned to the previous stage of copper sulfide concentrating in sequence. The selected concentrate obtained from each stage of copper sulfide concentrating enters the next stage of copper sulfide concentrating operation. The copper sulfide concentrated concentrate obtained from the last stage of copper sulfide concentrating is the high-grade copper sulfide concentrate. 20g / t of amyl xanthate is added to the copper sulfide roughing tailings for a copper sulfide scavenging operation. The copper sulfide scavenging tailings are returned to the copper sulfide roughing operation, and the copper sulfide scavenging tailings enter the desludging operation.

[0025] B. Desliming: After the copper sulfide scavenging tailings are deslimed by a cyclone, the ore sand enters the free oxide copper flotation;

[0026] C. Free-oxidized copper flotation: The ore sand obtained in step B is first dispersed into ore slime using a dispersant, sodium fluorosilicate, at 300 g / t. The ore is then activated using sodium sulfide at 2400 g / t. A combined collector, amyl xanthate at 160 g / t and butyl ammonium black powder at 40 g / t, and a frother, 2# oil at 30 g / t, are added to perform a free-oxidized copper roughing operation to obtain a free-oxidized copper roughing concentrate. The free-oxidized copper roughing concentrate is then added with sodium sulfide at 100 g / t and a combined collector, amyl xanthate at 10 g / t and butyl ammonium black powder at 4 g / t, and then subjected to a free-oxidized copper concentration operation to obtain a high-grade copper oxide concentrate 1. The free-oxidation copper roughing tailings are subjected to two free-oxidation copper scavenging operations. The reagent dosage of the first-stage free-oxidation copper scavenging is 800g / t of sodium sulfide and a combined collector of 80g / t of amyl xanthate and 20g / t of butyl ammonium black medicine. The reagent dosage of the second-stage free-oxidation copper scavenging is 300g / t of sodium sulfide and a combined collector of 20g / t of amyl xanthate and 10g / t of butyl ammonium black medicine. The mid-sized materials from the first-stage free-oxidation copper scavenging are returned to the free-oxidation copper roughing operation in sequence, and the mid-sized materials from the second-stage free-oxidation copper scavenging are returned to the first-stage free-oxidation copper scavenging operation in sequence. The tailings of each stage of free-oxidation copper scavenging enter the next stage of free-oxidation copper scavenging, and the tailings of the second stage of free-oxidation copper scavenging enter the combined copper oxide flotation.

[0027] D. Combined copper oxide flotation: The free copper oxide scavenging tailings are first activated with ethylenediamine phosphate 200g / t, and then 400g / t of sodium sulfide, 30g / t of combined collector amyl xanthate and 10g / t of butyl ammonium black powder and 10g / t of frother 2# oil are added to carry out a combined copper oxide roughing to obtain a combined copper oxide roughing concentrate. The combined copper oxide roughing concentrate is subjected to two combined copper oxide concentrations. The dosage of the first stage combined copper oxide concentration reagent is 100g / t of sodium sulfide and 10g / t of combined collector amyl xanthate and 10g / t of butyl ammonium black powder. The dosage of black medicine is 5g / t, and the dosage of the second-stage combined copper oxide concentration reagent is 100g / t of sodium sulfide and a combined collector of 10g / t of amyl xanthate and 4g / t of butyl ammonium black medicine. The selected tailings of the first-stage combined copper oxide concentration are returned to the combined copper oxide roughing operation in sequence, and the selected tailings of the second-stage combined copper oxide concentration are returned to the first-stage combined copper oxide concentration operation in sequence. The selected concentrate of each stage combined copper oxide concentration enters the next stage combined copper oxide concentration operation, and the selected concentrate of the last stage combined copper oxide concentration is the low-grade copper oxide concentrate 2. The copper oxide roughing tailings are subjected to two copper oxide scavenging operations. The dosage of the first-stage copper oxide scavenging agent is 300g / t of sodium sulfide and 20g / t of combined collector amyl xanthate and 10g / t of butyl ammonium black medicine. The dosage of the second-stage copper oxide scavenging agent is 200g / t of sodium sulfide and 20g / t of combined collector amyl xanthate and 10g / t of butyl ammonium black medicine. The ore from the first-stage copper oxide scavenging is returned to the copper oxide roughing operation in sequence, and the ore from the second-stage copper oxide scavenging is returned to the first-stage copper oxide scavenging operation in sequence. The tailings from each stage of copper oxide scavenging enter the next stage of copper oxide scavenging operation, and the tailings from the last stage of copper oxide scavenging enter the magnetic copper oxide strong magnetic separation.

[0028] E. Magnetic-bonded copper oxide strong magnetic separation: The tailings from the last stage of copper oxide scavenging in step D are subjected to secondary strong magnetic separation with a magnetic field strength of 1.75 T to recover weakly magnetic-bonded copper oxide, thereby obtaining copper oxide concentrate 3 and final tailings.

[0029] Example 2

[0030] The original ore is a copper oxide ore containing 5.40% copper and 0.16% sulfur. The main gangue is quartz (77.36%), followed by dolomite, calcite, and muscovite. The copper minerals are diverse, including malachite (5.73%), chrysocolla (3.51%), and pseudomalachite (0.06%), as well as copper sulfide (0.86%). Cu is primarily found in malachite, followed by chrysocolla and copper sulfide, and is partially dispersed in manganese-cobalt-copper silicate minerals.

[0031] This embodiment uses the same method flow and reagent system as Example 1 to treat the above-mentioned raw ore.

[0032] Comparative Example 1

[0033] The original ore is a copper oxide ore, containing 4.79% copper and 0.14% sulfur. The main gangue is quartz (75.90%), followed by muscovite, chlorite, and dolomite. The copper minerals are numerous, including malachite (5.15%), chrysocolla (3.11%), and pseudomalachite (0.04%), as well as copper sulfide (0.77%). Cu is primarily found in malachite, followed by chrysocolla and copper sulfide, with some concentrations dispersed in other silicate minerals.

[0034] In this comparative example, the above raw ore was pre-selected into copper sulfide ore, and after desliming, it was activated with sodium sulfide, and then copper oxide was floated using amyl xanthate.

[0035] The results of Example 1, Example 2 and Comparative Example 1 are shown in Table 1.

[0036]

[0037]

[0038] The results of Examples 1 and 2 shown in Table 1 indicate that Example 1, with an ore copper grade of 6.05%, yielded: a high-grade copper sulfide concentrate with a yield of 1.19%, a copper grade of 58.50%, and a copper recovery of 11.51%; a high-grade copper oxide concentrate 1 with a yield of 10.63%, a copper grade of 28.74%, and a copper recovery of 50.53%; a low-grade copper oxide concentrate 2 with a yield of 6.55%, a copper grade of 17.56%, and a copper recovery of 19.02%; and a low-grade copper oxide concentrate 3 with a yield of 3.32%, a copper grade of 7.62%, and a copper recovery of 4.18%. The overall copper recovery rate reached 85.25%.

[0039] In Example 2, the original ore had a copper grade of 5.40%, yielding: a high-grade copper sulfide concentrate with a yield of 1.09%, a copper grade of 59.88%, and a copper recovery rate of 12.08%; a high-grade copper oxide concentrate 1 with a yield of 9.89%, a copper grade of 27.74%, and a copper recovery rate of 50.76%; a low-grade copper oxide concentrate 2 with a yield of 5.82%, a copper grade of 16.71%, and a copper recovery rate of 17.99%; and a low-grade copper oxide concentrate 3 with a yield of 3.41%, a copper grade of 7.11%, and a copper recovery rate of 4.49%. The overall copper recovery rate reached 85.32%.

[0040] In Comparative Example 1, the original ore had a copper grade of 4.79%, yielding a high-grade copper sulfide concentrate with a yield of 0.89%, a copper grade of 57.88%, and a copper recovery of 10.76%. A copper oxide concentrate with a yield of 11.43%, a copper grade of 26.04%, and a copper recovery of 62.14% was obtained. The overall copper recovery rate reached 72.90%. The process in Comparative Example 1 employed sodium sulfide activation followed by flotation for copper oxide, primarily targeting the flotation recovery of malachite. However, the copper in malachite and other copper-containing silicate minerals was difficult to recover through activation and flotation, resulting in loss in the tailings. This ultimately resulted in a low recovery rate.

[0041] Those skilled in the art can make various corresponding changes and modifications based on the above technical solutions and concepts, and all of these changes and modifications should be included in the scope of protection of the claims of the present invention.

Claims

1. A step-by-step intensified recovery method for recovering multiple complex copper ores, characterized in that: The steps include: A. Copper sulfide flotation: After the raw ore is ground, the slurry ground to the target particle size is added with a collector, amyl xanthate, and a frother, No. 2 oil, for copper sulfide roughing. The rougher tailings from the copper sulfide roughing process are sent to the copper sulfide scavenging process, and the rougher concentrate from the copper sulfide roughing process is sent to the copper sulfide concentrating process. The final concentrate obtained from the copper sulfide concentrating process is the copper sulfide concentrate, and the final scavenging tailings from the copper sulfide scavenging process are transferred to step B for processing. B. Desliming: The scavenged tailings obtained in step A are deslimed by a cyclone, and the deslimed ore enters step C for treatment; C. Free-oxidation copper flotation: The ore sand obtained in step B is activated with sodium sulfide, and then amyl xanthate, butyl ammonium black powder and 2# oil are added. The ore then enters the free-oxidation copper roughing operation. The roughing concentrate obtained from the free-oxidation copper roughing operation enters the free-oxidation copper concentrating operation, and the roughing tailings obtained from the free-oxidation copper roughing operation enter the free-oxidation copper scavenging operation. The final concentrated concentrate obtained from the free-oxidation copper concentrating operation is the first copper oxide concentrate, and the final scavenging tailings obtained from the free-oxidation copper scavenging operation enter the treatment of step D. D. Combined copper oxide flotation: The scavenging tailings obtained from the free copper oxide scavenging are activated with ethylenediamine phosphate, and then sodium sulfide, amyl xanthate, butyl ammonium black powder and 2# oil are added to carry out combined copper oxide roughing. The roughing concentrate obtained from the combined copper oxide roughing is subjected to the combined copper oxide concentrating operation, and the roughing tailings obtained from the combined copper oxide roughing are subjected to the combined copper oxide scavenging operation. The concentrated concentrate obtained from the combined copper oxide concentrating operation is the second copper oxide concentrate, and the scavenging tailings obtained from the combined copper oxide scavenging operation are subjected to the treatment of step E. E. Magnetic combination with strong magnetic separation of copper oxide: The scavenging tailings obtained by combining copper oxide scavenging are subjected to high gradient strong magnetic separation to obtain copper oxide concentrate 3 and final tailings.

2. The method according to claim 1, characterized in that In step A, one copper sulfide roughing, one copper sulfide scavenging and four copper sulfide concentrating operations are performed; the concentrating tailings obtained from the first stage of copper sulfide concentrating are returned to the copper sulfide roughing operation, and the concentrating tailings obtained from the remaining stages of copper sulfide concentrating are sequentially returned to the copper sulfide concentrating operation of the previous stage, and the concentrating concentrate obtained from each stage of copper sulfide concentrating is fed to the copper sulfide concentrating operation of the next stage, and the concentrating copper sulfide concentrate obtained from the last stage of copper sulfide concentrating is the copper sulfide concentrate.

3. The method according to claim 1 or 2, characterized in that In step A, based on the dry weight of each ton of raw ore, 40 g / t of amyl xanthate as a collector and 30 g / t of 2# oil as a foaming agent were added to the copper sulfide roughing; 20 g / t of amyl xanthate was added to the copper sulfide scavenging.

4. The method according to claim 1, wherein In step C, one free-oxidation copper roughing, two free-oxidation copper scavengings and one free-oxidation copper concentrating are carried out; the concentrating tailings obtained from the free-oxidation copper concentrating are returned to the free-oxidation copper roughing operation in sequence; the scavenged middlings obtained from the first-stage free-oxidation copper scavenging are returned to the free-oxidation copper roughing operation in sequence, and the scavenged middlings obtained from the second-stage free-oxidation copper scavenging are returned to the first-stage free-oxidation copper scavenging operation in sequence; the scavenged tailings obtained from the first-stage free-oxidation copper scavenging enter the second-stage free-oxidation copper scavenging operation, and the scavenged tailings obtained from the second-stage free-oxidation copper scavenging enter the treatment of step D.

5. The method according to claim 1 or 4, characterized in that In step C, before activation with sodium sulfide, sodium fluorosilicate as a dispersant is added to the ore sand obtained in step B; sodium sulfide, amyl xanthate and butyl ammonium xanthate are added during both the free-oxidized copper selection and the free-oxidized copper scavenging.

6. The method according to claim 5, characterized in that In step C, 300 g / t of sodium fluorosilicate and 2400 g / t of sodium sulfide as dispersants are added to the ore sand based on the dry weight of each ton of raw ore; 160 g / t of amyl xanthate as collectors, 40 g / t of butyl ammonium black powder and 30 g / t of 2# oil as a foaming agent are added in the roughing of free-oxidized copper; 100 g / t of sodium sulfide, 10 g / t of amyl xanthate and 4 g / t of butyl ammonium black powder are added in the concentration of free-oxidized copper; the dosage of the reagents for the first-stage free-oxidized copper scavenging is 800 g / t of sodium sulfide, 80 g / t of amyl xanthate and 20 g / t of butyl ammonium black powder, and the dosage of the reagents for the second-stage free-oxidized copper scavenging is 300 g / t of sodium sulfide, 20 g / t of amyl xanthate and 10 g / t of butyl ammonium black powder.

7. The method according to claim 1, characterized in that In step D, one combined copper oxide roughing operation, two combined copper oxide scavenging operations, and two combined copper oxide concentrating operations are performed; the concentrating tailings obtained from the first-stage combined copper oxide concentrating operation are sequentially returned to the combined copper oxide roughing operation, the concentrating tailings obtained from the second-stage combined copper oxide concentrating operation are sequentially returned to the first-stage combined copper oxide concentrating operation, and the concentrating concentrate obtained from the first-stage combined copper oxide concentrating operation enters the second-stage combined copper oxide concentrating operation; the scavenged ore obtained from the first-stage combined copper oxide scavenging operation is sequentially returned to the combined copper oxide roughing operation, the scavenged ore obtained from the second-stage combined copper oxide scavenging operation is sequentially returned to the first-stage combined copper oxide scavenging operation, the scavenged tailings obtained from the first-stage combined copper oxide scavenging operation enters the second-stage combined copper oxide scavenging operation, and the scavenged tailings obtained from the second-stage combined copper oxide scavenging operation enter the treatment of step E.

8. The method according to claim 7, characterized in that In step D, based on the dry weight of each ton of raw ore, the scavenging tailings obtained by scavenging free copper oxide are first activated with 200g / t of ethylenediamine phosphate and 400g / t of sodium sulfide; in combination with the roughing of copper sulfide, 30g / t of amyl xanthate, 10g / t of butyl ammonium black powder and 10g / t of No. 2 oil are added; the dosage of the reagents used in the first stage of the copper oxide selection is 100g / t of sodium sulfide, 10g / t of amyl xanthate and 10g / t of butyl ammonium black powder. The dosage of reagents for the second stage combined with copper oxide selection is 100g / t of sodium sulfide, 10g / t of amyl xanthate and 4g / t of butyl ammonium black medicine; the dosage of reagents for the first stage combined with copper oxide scavenging is 300g / t of sodium sulfide, 20g / t of amyl xanthate and 10g / t of butyl ammonium black medicine, and the dosage of reagents for the second stage combined with copper oxide scavenging is 200g / t of sodium sulfide, 20g / t of amyl xanthate and 10g / t of butyl ammonium black medicine.

Images