A method for enhanced flotation of copper smelter slag

Abstract

The application discloses a copper smelting slag reinforced flotation method, comprising the following steps: S1, rough grinding: crushing and wet grinding of the copper smelting slag raw ore to prepare ore slurry with a concentration of 30%-35%; S2, rapid flotation: adding a combined collector and a foaming agent to the ore slurry obtained in the step S1 to perform rapid flotation to obtain fast selection concentrate and fast selection tailings; S3, rough selection: regrinding the fast selection tailings obtained in the step S2 to a content of-0.045 mm of greater than or equal to 85%, adding an adjusting agent, an activator, a combined collector and a foaming agent to perform rough selection to obtain rough selection concentrate and rough selection tailings; S4, selection: performing blank selection on the rough selection concentrate obtained in the step S3 to obtain copper concentrate; and S5, scavenging: adding a combined collector to the rough selection tailings obtained in the step S3 to perform scavenging. The gradient separation structure of 'rapid flotation-tailings regrinding' effectively alleviates the 'overgrinding-undergrinding' contradiction, and the combined collector and the activator are used in cooperation to realize global recovery of copper minerals.

Description

Technical Field

[0001] This invention relates to the field of mineral processing methods, and in particular to an enhanced flotation method for copper smelting slag. Background Technology

[0002] Copper smelting slag is a typical solid waste generated during the pyrometallurgical process of copper smelting, mainly originating from smelting furnaces, converters, and other smelting stages. Its mineral composition is complex, usually containing valuable copper in the form of copper sulfides (such as chalcocite and covellite), copper oxides (such as malachite and chrysocolla), and metallic copper, while also containing associated olivine, magnetite, glassy phases, and small amounts of other metal sulfides.

[0003] Currently, industrial practices for recovering copper from copper smelting slag mainly rely on the traditional "grinding-flotation" process. However, this process generally suffers from three major technical bottlenecks when processing copper smelting slag with its unique physical properties: "low grinding-classification efficiency," "poor reagent compatibility," and "irrational process structure." This results in unsatisfactory final copper concentrate grade and recovery rate, significant copper loss in tailings, and low resource utilization rate.

[0004] Due to the hardness and toughness of the copper smelting slag matrix and the uneven distribution of valuable minerals, traditional single-stage grinding processes struggle to achieve selective liberation of copper minerals, resulting in both under-grinding and over-grinding. Coarse-grained (e.g., +0.055mm) intergrowths fail to fully liberate, leading to the loss of valuable minerals. Meanwhile, liberated minerals and gangue are easily over-ground, generating large amounts of fine mud. This fine mud, by covering the surface of coarse particles and interfering with the mineralization process through non-selective adsorption reagents, severely deteriorates flotation selectivity, resulting in a significant reduction in recovery rate. Simultaneously, copper in the copper smelting slag... The phase composition is complex, and the existing processes use traditional collectors such as xanthates with simple mechanisms of action, which have limited ability to collect secondary copper sulfide and copper oxide. Furthermore, the lack of targeted activators and fine control of pulp pH makes it impossible to create a suitable solution chemical environment for the action of the reagents, resulting in low concentrate grade and total recovery rate. In addition, the traditional "uniform fine grinding-full-size flotation" process ignores the differences in mineral floatability, which causes the already dissociated and easily floatable copper minerals to be retained in the system, exacerbating mud formation and reagent consumption, reducing the overall separation efficiency, resulting in high copper grade in the tailings and serious resource loss.

[0005] In summary, developing a new enhanced flotation process that can synergistically optimize grinding, reagents, and process flow to achieve efficient and economical recovery of copper minerals of different phases from copper smelting slag has become an urgent technical need to promote the resource utilization of copper smelting solid waste and improve metal recovery rate. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method for enhanced flotation of copper smelting slag.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The raw copper smelting slag is crushed and wet-ground to obtain a slurry with a concentration of 30% to 35%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a -0.045mm content ≥ 85%, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0008] In step S1, the content of -0.045mm in the wet-milled slurry is 65%-70%.

[0009] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 1-2 minutes.

[0010] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of (0.8-1.2):1, with a dosage of 40-80 g / t; the foaming agent is No. 2 oil, with a dosage of 5-15 g / t.

[0011] In step S3, the modifier is sodium carbonate, with a dosage of 200-500 g / t; the activator is sodium sulfide, with a dosage of 30-60 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of (0.8-1.2):1, with a dosage of 60-100 g / t; and the foaming agent is No. 2 oil, with a dosage of 5-15 g / t.

[0012] In step S4, the number of selections is 2, namely selection 1 and selection 2. The selected ore 1 of selection 1 returns to the coarse selection operation, and the selected ore 2 of selection 2 returns to selection 1. Both selection 1 and selection 2 are blank selections.

[0013] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. The collector for scavenging is a combination of salicylic acid hydroxamic acid and fast-extraction thiocarbamate (0.8-1.2):1, and the dosage is 50-100g / t.

[0014] The beneficial effects of this invention are: 1. The roughing operation of this invention is carried out in the tailings slurry after pre-flotation. Its key lies in constructing a physicochemical environment conducive to the synergistic effect of the combined collectors, specifically including: (1) In rapid flotation, the rapid flotation operation is introduced immediately after coarse grinding (-0.045mm content 65%-70%). The purpose is to: based on the significant differences in the floatability of minerals in the copper smelting slag ore, to preferentially and rapidly float out medium and coarse-grained copper minerals that have been basically liberated and have good floatability under coarse grinding conditions, and directly obtain high-grade rapid flotation concentrate.

[0015] (2) During roughing, a pH adjuster is added to the pulp, preferably sodium carbonate, to stabilize the pulp pH in the weakly alkaline range of 9.5-10.5. This environment not only effectively inhibits sulfides such as pyrite that are easily suppressed in alkaline environments, creating conditions for the subsequent efficient and selective flotation of copper, but also optimizes the ionization state of salicylhydroxyxamic acid and enhances its chelating and collecting ability.

[0016] (3) During the fine selection process, no reagents are added to Fine Selection 1 and Fine Selection 2. The design of not adding reagents ensures that the fine selection process prioritizes improving the grade and obtains high-purity concentrate through pure physical enrichment.

[0017] 2. Another core innovation of this invention lies in the structural optimization of the process route. Traditional processes often involve uniform fine grinding of all ores, which easily leads to over-grinding and mudding of liberated minerals. This invention, through "rapid flotation pre-treatment," recovers approximately 60% of easily floatable copper under coarse grinding conditions. This not only directly improves economic efficiency but, more importantly, "reduces the burden" on subsequent regrinding operations, allowing regrinding energy to be more concentrated on the intergrowths that truly need liberation, thereby alleviating the contradiction between "over-grinding" and "under-grinding" at the system level. This process concept of "graded treatment and targeted solutions" perfectly matches the aforementioned "whole-phase recovery" reagent system, forming a deep integration of process and reagents. This is a systematic solution that is not easily conceived by those skilled in the art under conventional thinking.

[0018] 3. This invention innovatively combines two collectors (A salicylic acid hydroxamic acid + B fast-extraction thiocarbamate) with different mechanisms of action and applies them to a copper smelting slag flotation system. Research revealed a significant synergistic effect: component B can adsorb onto the surface of copper oxide and interact with component A through its benzene ring structure, altering the bubble-mineral interface properties. This allows component A to more effectively synergistically adsorb and work together to ultimately achieve "full-range, efficient, and simultaneous" recovery of copper minerals from different phases (primary copper sulfide, secondary copper sulfide, and copper oxide) in copper smelting slag. This effect is not a simple superposition of their functions, but rather produces an unexpected technical effect of "1+1>2," effectively solving the technical bottleneck of low recovery rate and poor selectivity in traditional single collectors when processing complex copper smelting slag. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0021] Example 1 The copper smelting slag ore mentioned above originated from copper synthesis slag and converter slag obtained from a copper mine beneficiation plant in Gansu Province. The Cu content in the copper smelting slag ore was 1.53%.

[0022] like Figure 1 As shown, a method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The copper smelting slag ore is crushed to -2mm and wet-milled using a ball mill, with the slurry concentration controlled at 32% and the content of -0.045mm in the grinding fineness at 68%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a content of 85% in -0.045mm, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3. Each fine refinement takes 2 minutes. The middlings are returned to the previous operation in sequence to obtain copper concentrate. S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0023] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 1 minute.

[0024] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 40 g / t; the foaming agent is No. 2 oil, with a dosage of 10 g / t.

[0025] In step S3, the modifier is sodium carbonate, with a dosage of 250 g / t; the activator is sodium sulfide, with a dosage of 40 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 80 g / t; and the foaming agent is No. 2 oil, with a dosage of 10 g / t.

[0026] In step S4, the number of selections is 2, namely selection 1 and selection 2. The selected ore 1 of selection 1 returns to the coarse selection operation, and the selected ore 2 of selection 2 returns to selection 1. Both selection 1 and selection 2 are blank selections.

[0027] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. Scavenging 1 adds 40g / t of combined collector salicylic acid + fast-extraction thiocarbamate (1:1) and 5g / t of frother, and scavenging 2 adds 10g / t of combined collector salicylic acid + fast-extraction thiocarbamate (1:1).

[0028] Based on the characteristics of the ore and detailed conditional tests, combined with an innovative new flotation process and the addition of appropriate amounts of new flotation reagents, copper flotation was successfully achieved, and mixed copper concentrate beneficiation products were obtained. The closed-circuit test indicators are shown in Table 1.

[0029] , As shown in Table 1, the closed-circuit test yielded a mixed copper concentrate with a Cu grade of 20.46% and a Cu recovery rate of 88.68%.

[0030] Example 2 The copper smelting slag ore used is the same as that in Example 1.

[0031] like Figure 1 As shown, a method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The copper smelting slag ore is crushed to -2mm and wet-milled using a ball mill, with the slurry concentration controlled at 32% and the content of -0.045mm in the grinding fineness at 68%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a content of 85% in -0.045mm, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0032] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 2 minutes.

[0033] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 40 g / t; the foaming agent is No. 2 oil, with a dosage of 10 g / t.

[0034] In step S3, the modifier is sodium carbonate, with a dosage of 250 g / t; the activator is sodium sulfide, with a dosage of 40 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 100 g / t; and the foaming agent is No. 2 oil, with a dosage of 10 g / t.

[0035] In step S4, the selection process is performed twice, with each selection lasting 2 minutes. These are called Selection 1 and Selection 2. The selected ore 1 from Selection 1 returns to the coarse selection operation, and the selected ore 2 from Selection 2 returns to Selection 1. Both Selection 1 and Selection 2 are blank selections.

[0036] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. Scavenging 1 adds 60g / t of combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1) and 5g / t of foaming agent 2# oil. Scavenging 2 adds 30g / t of combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1).

[0037] Based on the characteristics of the ore and detailed condition tests, combined with an innovative new flotation process and the addition of appropriate amounts of new flotation reagents, copper flotation was successfully achieved, and mixed copper concentrate beneficiation products were obtained. The closed-circuit test indicators are shown in Table 2.

[0038] , As shown in Table 2, the closed-circuit test yielded a mixed copper concentrate with a Cu grade of 19.26% and a Cu recovery rate of 87.96%.

[0039] Example 3 The copper smelting slag ore used is the same as that in Example 1.

[0040] like Figure 1 As shown, a method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The copper smelting slag ore is crushed to -2mm and wet-milled using a ball mill, with the slurry concentration controlled at 32% and the content of -0.045mm in the grinding fineness at 68%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a content of 85% in -0.045mm, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0041] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 1 minute.

[0042] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 40g / t; the foaming agent is No. 2 oil, with a dosage of 15g / t.

[0043] In step S3, the modifier is sodium carbonate, with a dosage of 250 g / t; the activator is sodium sulfide, with a dosage of 40 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1:1, with a dosage of 80 g / t; and the foaming agent is No. 2 oil, with a dosage of 10 g / t.

[0044] In step S4, the selection process is performed twice, with each selection lasting 2 minutes. These are called Selection 1 and Selection 2. The selected ore 1 from Selection 1 returns to the coarse selection operation, and the selected ore 2 from Selection 2 returns to Selection 1. Both Selection 1 and Selection 2 are blank selections.

[0045] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. Scavenging 1 adds 40g / t of combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1) and 5g / t of foaming agent 2# oil. Scavenging 2 adds 10g / t of combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1).

[0046] Based on the characteristics of the ore and detailed conditional tests, combined with an innovative new flotation process and the addition of appropriate amounts of new flotation reagents, copper flotation was successfully achieved, and mixed copper concentrate beneficiation products were obtained. The closed-circuit test indicators are shown in Table 3.

[0047] , As shown in Table 3, the closed-circuit test yielded a mixed copper concentrate with a Cu grade of 20.54% and a Cu recovery rate of 86.75%.

[0048] Example 4 like Figure 1 As shown, a method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The copper smelting slag ore is crushed and wet-ground to obtain a slurry with a concentration of 30%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a content of 85% in -0.045mm, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0049] In step S1, the -0.045mm content in the wet-milled slurry is 65%.

[0050] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 1 minute.

[0051] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 0.8:1, with a dosage of 40g / t; the foaming agent is No. 2 oil, with a dosage of 5g / t.

[0052] In step S3, the modifier is sodium carbonate, with a dosage of 200 g / t; the activator is sodium sulfide, with a dosage of 30 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 0.8:1, with a dosage of 60 g / t; and the foaming agent is No. 2 oil, with a dosage of 5 g / t.

[0053] In step S4, the number of selections is 2, namely selection 1 and selection 2. The selected ore 1 of selection 1 returns to the coarse selection operation, and the selected ore 2 of selection 2 returns to selection 1. Both selection 1 and selection 2 are blank selections.

[0054] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. The collector for scavenging is a combination of salicylic acid and fast-extraction thiocarbamate in a ratio of 0.8:1, and the dosage is 50g / t.

[0055] Example 5 like Figure 1 As shown, a method for enhanced flotation of copper smelting slag includes the following steps: S1. Coarse grinding: The copper smelting slag ore is crushed and wet-ground to obtain a slurry with a concentration of 35%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a content of 85% in -0.045mm, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

[0056] In step S1, the content of -0.045mm in the wet-milled slurry is 70%.

[0057] In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 2 minutes.

[0058] In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1.2:1, with a dosage of 80g / t; the foaming agent is No. 2 oil, with a dosage of 15g / t.

[0059] In step S3, the modifier is sodium carbonate, with a dosage of 500 g / t; the activator is sodium sulfide, with a dosage of 60 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of 1.2:1, with a dosage of 100 g / t; and the foaming agent is No. 2 oil, with a dosage of 15 g / t.

[0060] In step S4, the number of selections is 2, namely selection 1 and selection 2. The selected ore 1 of selection 1 returns to the coarse selection operation, and the selected ore 2 of selection 2 returns to selection 1. Both selection 1 and selection 2 are blank selections.

[0061] In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. The collector for scavenging is a combination of salicylic acid hydroxamic acid and fast-extraction thiocarbamate in a 1.2:1 ratio, and the dosage is 100g / t.

[0062] Comparative Example 1 Comparative Example 1 used the same copper smelting slag ore as Example 1, but replaced all the combined collectors with other combined collectors, butyl xanthate + butyl ammonium black powder (2:1). The types and amounts of other reagents and process parameters were exactly the same as in Example 1. The closed-circuit test results are shown in Table 4.

[0063] , Comparing Example 1 and Comparative Example 1, under the same conditions of other reagents, the mixed copper concentrate obtained by the combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1) in Example 1 had a Cu grade of 20.46% and a Cu recovery rate of 88.68%. In Comparative Example 1, the combined collector was butyl xanthate + butylammonium black (2:1), in which both the Cu grade and Cu recovery rate of the mixed copper concentrate decreased, with a Cu grade of 17.88% and a Cu recovery rate of 71.67%. These results indicate that the combined collector salicylic acid hydroxamic acid + fast-extraction thiocarbamate (1:1) exhibits superior performance.

[0064] Comparative Example 2 Comparative Example 2 used the same raw ore as Example 1, but the activator sodium sulfide was not added in the roughing and scavenging operations. The types and amounts of other reagents and process parameters were exactly the same as in Example 1. The closed-circuit test parameters for mineral processing are shown in Table 5.

[0065] , Comparing Example 1 and Comparative Example 2, under the same conditions of other reagents, the mixed copper concentrate obtained by adding sodium sulfide as an activator in the roughing and scavenging processes of Example 1 had a Cu grade of 20.46% and a Cu recovery rate of 88.68%. In Comparative Example 2, without the addition of sodium sulfide as an activator in the roughing and scavenging processes, both the Cu grade and Cu recovery rate of the mixed copper concentrate decreased, with a Cu grade of 17.80% and a Cu recovery rate of 74.08%. These results indicate that adding sodium sulfide as an activator in the roughing and scavenging processes demonstrates superior performance.

[0066] Comparative Example 3 Comparative Example 3 used the same raw ore as Example 1, but fast flotation was cancelled and it was directly finely ground. The dosage was the same as in Example 1. The closed-circuit test indicators are shown in Table 6.

[0067] , Comparing Example 1 and Comparative Example 3, under the same reagent conditions, the mixed copper concentrate obtained by the "rapid flotation pre-process" in Example 1 had a Cu grade of 20.46% and a Cu recovery rate of 88.68%. In Comparative Example 1, rapid flotation was eliminated and direct fine grinding was performed, resulting in a decrease in both the Cu grade and Cu recovery rate in the copper concentrate. The Cu grade in the copper concentrate was 14.82%, and the Cu recovery rate was 78.35%. These results indicate that direct fine grinding of the raw ore leads to over-grinding and mud formation of easily floatable copper minerals. The mud adsorbs reagents, interfering with flotation, and energy consumption is concentrated on easily floatable minerals that do not require fine grinding. Furthermore, the dissociation of intergrowths remains insufficient, verifying the necessity of "rapid flotation pre-process" in alleviating the "over-grinding-under-grinding" contradiction.

[0068] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A method for enhanced flotation of copper smelting slag, characterized in that, Includes the following steps: S1. Coarse grinding: The raw copper smelting slag is crushed and wet-ground to obtain a slurry with a concentration of 30% to 35%. S2. Rapid flotation: Add a combination collector and a frother to the slurry obtained in step S1 and perform rapid flotation to obtain rapid flotation concentrate and rapid flotation tailings. S3. Roughing: The tailings obtained in step S2 are regrinded to a -0.045mm content ≥ 85%, and modifiers, activators, combined collectors and frothers are added for roughing to obtain roughing concentrate and roughing tailings; S4. Fine Refinement: Perform blank fine refinement on the rough concentrate obtained in step S3 to obtain copper concentrate; S5. Scavenging: Add a combined collector to the rough tailings obtained in step S3 for scavenging to obtain tailings.

2. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S1, the -0.045mm content in the wet-milled slurry is 65%-70%.

3. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S2, the rapid flotation is performed immediately after the coarse grinding in step S1, and the flotation time is 1-2 minutes.

4. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S2, the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of (0.8-1.2):1, with a dosage of 40-80 g / t; the foaming agent is No. 2 oil, with a dosage of 5-15 g / t.

5. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S3, the modifier is sodium carbonate, with a dosage of 200-500 g / t; the activator is sodium sulfide, with a dosage of 30-60 g / t; the combined collector is a mixture of salicylic acid hydroxamic acid and fast-extracting thiocarbamate in a mass ratio of (0.8-1.2):1, with a dosage of 60-100 g / t; and the foaming agent is No. 2 oil, with a dosage of 5-15 g / t.

6. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S4, the number of selections is 2, namely selection 1 and selection 2. The selected ore 1 of selection 1 returns to the coarse selection operation, and the selected ore 2 of selection 2 returns to selection 1; both selection 1 and selection 2 are blank selections.

7. The enhanced flotation method for copper smelting slag according to claim 1, characterized in that, In step S5, the scavenging is performed twice, namely scavenging 1 and scavenging 2. The ore 1 from scavenging 1 is returned to the roughing operation, and the ore 2 from scavenging 2 is returned to scavenging 1. The collector for scavenging is a combination of salicylic acid hydroxamic acid and fast-extraction thiocarbamate (0.8-1.2):1, and the dosage is 50-100g / t.

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