Method for recovering copper from slime

Abstract

The invention belongs to the technical field of copper recovery in mineral processing, and discloses a method for recovering copper from slime, which comprises the following steps: injecting the slime to be treated into an efficient stirring tank, controlling the stirring speed to be 150-200r / min, controlling the stirring time to be not less than 30min, performing efficient stirring, adding a combined vulcanizing agent and a polyaspartic acid dispersing agent to perform synergistic effect, and performing uniform stirring. And finally, a copper sulfide ore collecting agent is added to recover the copper sulfide ore in the slime, and a copper concentrate product with the copper-containing grade not lower than 14.18% and the copper recovery rate not lower than 70.03% is obtained. According to the method, the process adaptability is high, the micro-fine particle grade copper-containing ore mud generated in the underground operation and grinding process can be further recycled, the comprehensive utilization rate of copper resources is increased, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of copper recovery in mineral processing, and in particular relates to a method for recovering copper from ore mud. Background Art

[0002] With continuous mining, the easy-to-mine ores and rich ores in copper resources are gradually decreasing, while the lean ores, surface ores and refractory ores are increasing. In the process of copper resource development and utilization, fine-grained gangue minerals restrict the enrichment of useful minerals, resulting in low copper recovery rate. It is imperative to make full use of copper resources and strengthen the recovery of copper-containing minerals in fine-grained siliceous gangue minerals.

[0003] Since the copper minerals in the sludge are mainly copper oxide ores with fine particle size, it is difficult to recycle them. If directly floated, the sludge has small mass and large specific surface area, and is easy to float in the foam, reducing the quality of the concentrate. At the same time, other sludges are also easy to cover the surface of the copper-containing minerals, affecting their floating. In addition, due to the large specific surface area of ​​the sludge, a large amount of flotation reagents are adsorbed. With the increase of reagents, the sludge also increases the viscosity of the slurry, resulting in worse aeration conditions. In addition, the surface dissolution rate of fine particles increases, and the "inevitable ions" in the slurry will also increase, ultimately resulting in a low copper recovery rate in the sludge.

[0004] In order to solve the above problems, domestic and foreign scholars have done a lot of research on the comprehensive recovery of copper from tailings or ore mud in recent years, and have also achieved phased results. For example, the patent "A method for recycling low-grade oxidized copper ore in tailings" can effectively recycle the low-grade oxidized copper ore remaining in the tailings, so that this part of the oxidized copper ore resources can be utilized, solving the problem of the comprehensive recovery rate of mixed copper ore; the patent "Method for recovering gold and copper from ore mud" has the process conditions of controlling relevant parameters, with the advantages of low investment, low cost, high gold and copper recovery rate, easy industrialization, and environmental friendliness, which is suitable for the industry to recover gold and copper from gold-containing copper ore mud.

[0005] The significance of solving the above problems is that in the beneficiation process of copper-sulfur polymetallic minerals, a certain amount of ore mud with high copper grade will be produced during underground mining and crushing. The copper-containing ore mud in the ore mud is mainly oxidized copper ore, which has a fine particle size and is difficult to recover. Adding a combination of sulfiding agents and dispersants, and high-intensity stirring at the same time, can sulfide the fine-grained oxidized copper minerals, strengthen their dispersion effect with the gangue ore mud, add an appropriate amount of copper collector, and finally obtain qualified copper concentrate products, thereby improving the comprehensive utilization rate of copper resources. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a method for recovering copper from ore mud, which is achieved as follows:

[0007] The technical solution of the present invention is: a method for recovering copper from ore mud, the method specifically comprises the following steps:

[0008] S1) slurry mixing operation, injecting the sludge to be processed into a high-efficiency stirring tank, stirring for a certain period of time at a certain stirring rate, and obtaining a slurry in which the sludge is in a suspended state away from the bottom and completely dispersed;

[0009] S2) adding a certain amount of combined sulfiding agent to the slurry obtained in S1) for sulfidation, adding a certain amount of dispersant after stirring for a period of time, and injecting the fully stirred slurry into the flotation machine for flotation operation;

[0010] S3) flotation operation, the pulp treated by S2) enters the flotation tank for flotation operation of copper roughing section and copper scavenging section to obtain copper roughing mixed concentrate and tailings, a small amount of inhibitor and copper collector are added to the copper roughing mixed concentrate to perform copper concentration operation 1 to obtain copper concentration 1 concentrate and copper concentration 1 tailings; the copper concentration 1 concentrate is subjected to copper concentration operation 2 without adding reagents to obtain copper concentrate and copper concentration 2 tailings; the copper concentration 1 tailings are sequentially returned to the high-efficiency stirring tank, and the copper concentration 2 tailings are sequentially returned to the copper concentration 1 operation;

[0011] S4) Copper tailings treatment operation: the copper scavenging tailings enter the subsequent sulfur flotation operation system to recover sulfur.

[0012] Furthermore, the paddle structure in the stirring tank in S1) is a three-blade variable-section stirring paddle, the stirring speed is 150-200 r / min, and the stirring time is controlled to be greater than 30 min.

[0013] Furthermore, the S1) obtains a pulp concentration of 33.33%, a floating rate of no more than 5%, and a particle content of 90-92% with a slurry fineness of -0.045 mm.

[0014] Furthermore, the combined vulcanizing agent in S2) is a mixture of ammonium sulfate and sodium sulfide, the amount of ammonium sulfate is 400-500 g / t, the amount of sodium sulfide is 600-750 g / t; the dispersant is polyaspartic acid, the amount of which is 800-1000 g / t.

[0015] Furthermore, the copper roughing time in S3) is not less than 6 minutes, a small amount of CaO is added during the copper roughing to adjust the pulp pH to 9.5-10.0, ester and xanthate mixed collector 50g / t+30g / t is added, and 16g / t 2 #Oil; The copper scavenging time is not less than 4 minutes, and ester and xanthate mixed collector 20g / t+10g / t is added during copper scavenging; During the first copper concentration operation, lime is added to adjust the slurry pH value to 9.8-10.5, and ester collector 10g / t is added; The second copper concentration operation is blank concentration; The flotation time of copper concentration 1 and copper concentration 2 is not less than 4 minutes.

[0016] Furthermore, the copper grade recovered in the method is not less than 14.18%, and the copper recovery rate is not less than 70.03%.

[0017] A copper concentrate is prepared by the method.

[0018] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0019] Compared with traditional blades, the three-blade variable-section impeller in the stirring tank has a spiral surface structure and a larger working area, which can effectively suspend the slurry deposited at the bottom of the tank. It is more applicable in solid-liquid suspension occasions and has a better dispersion effect. The three-blade variable-section impeller adopts a streamlined stirring technology design, which is applicable to a wide range of liquid viscosities. Under the same ratio of impeller diameter to tank diameter and the same flow rate, it saves nearly 50-70% energy compared with traditional inclined blade impellers. Therefore, it is named a high-efficiency stirring tank.

[0020] The present invention develops a combined sulfiding agent and dispersant for the presence of fine copper oxide minerals in the ore mud, and adopts a high-efficiency stirring tank for stirring and slurrying to sulfidize the fine copper oxide minerals and strengthen the dispersion effect of the fine copper oxide minerals with the gangue ore mud. Long-term stirring + dispersant can fully disperse the copper oxide fine mud that agglomerates with each other, and can also make the fine mineral mud covering the surface of the copper-containing mineral fall off, thereby enhancing the adsorption amount of the flotation sulfiding agent on the surface of the copper oxide mineral, achieving the synergistic effect of stirring and slurrying and the combined sulfiding agent. The present invention can ultimately eliminate the adverse effects of fine mineral mud on the copper-containing minerals and improve the comprehensive recovery rate of the copper oxide ore. In addition, the process flow is simple and the investment is small. The dispersant polyaspartic acid will automatically decompose and will not affect the environment and water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a process flow chart of a method for recovering copper from ore slime. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In view of the problems existing in the prior art, the present invention provides a method for recovering copper from ore mud, which adopts a high-efficiency stirring tank and cooperates with an innovative combination of a sulfiding agent and a dispersant. Figure 1 The present invention is described in detail.

[0024] like Figure 1 As shown, the present invention provides a method for recovering copper from ore mud, which realizes flotation separation of copper-containing minerals and fine-grained argillaceous gangue minerals from ore mud. The flotation separation method comprises:

[0025] Step 1: Stirring and slurrying operation: inject the sludge into a high-efficiency stirring tank. The blade structure in the tank is a three-blade variable-section stirring paddle. The stirring speed is set to 150-200r / min and the stirring time is greater than 30min. When the sludge is in a suspended and completely dispersed state away from the bottom, add the reagent into the tank.

[0026] Step 2, dosing operation, adding ammonium sulfate and sodium sulfide and stirring, so that the dispersed fine-grained copper oxide ore can be sulfided, and after stirring for a period of time, adding dispersant polyaspartic acid to the slurry to disperse the copper sulfide ore and magnesium silicate fine mud with heterogeneous charges on the surface, and injecting the fully stirred slurry into the flotation machine for flotation operation;

[0027] Step 3, flotation operation of copper sulfide ore, the slurry after adding chemicals and stirring enters the flotation tank for flotation operation of copper roughing section and copper scavenging section to obtain copper roughing mixed concentrate and tailings, a small amount of inhibitor and copper collector are added to the copper roughing mixed concentrate to carry out copper concentration operation once to obtain copper concentration concentrate once and copper concentration tailings once; the copper concentration concentrate once is subjected to copper concentration operation twice without adding chemicals to obtain copper concentrate and copper concentration tailings twice; the copper concentration tailings once are returned to the high-efficiency stirring tank in sequence, and the copper concentration tailings twice are returned to the copper concentration operation once in sequence;

[0028] Step 4: Copper tailings treatment operation: the copper scavenging tailings enter the subsequent sulfur flotation operation system to recover sulfur.

[0029] Preferably, in step one, the sludge concentration in the high-efficiency stirring tank is about 33.33%, the floating does not exceed 5%, the particle content of the sludge fineness of -0.045mm is 90-92%, the blade structure in the tank is a three-blade variable-section stirring paddle, the stirring speed is set to 150-200r / min, and the stirring time is greater than 30min.

[0030] Preferably, in step 2, the amounts of ammonium sulfate and sodium sulfide are 400-500 g / t and 600-750 g / t respectively, and the amount of polyaspartic acid is 800-1000 g / t.

[0031] Preferably, the copper roughing time in step 3 is 6 minutes, a small amount of CaO is added during the copper roughing to adjust the pulp pH to 9.5-10.0, ester and xanthate mixed collector 50g / t+30g / t is added, and 16g / t 2 # Oil; The copper scavenging time is 4 minutes, and ester and xanthate mixed collector 20g / t+10g / t is added during copper scavenging; During the first copper concentration operation, lime is added to adjust the slurry pH value to 9.8-10.5, and ester collector 10g / t is added; The second copper concentration operation is blank concentration; The flotation time of copper concentration 1 and copper concentration 2 are 4min and 4min respectively.

[0032] In order to verify the technical effect of the present invention, the following is a description of the technical effect or experimental effect of the present invention under comparative tests in conjunction with the accompanying drawings. Figure 1 In this embodiment, an experimental study is conducted on the ore mud produced in a copper mine in Jiangxi Province. The specific experimental indicators and data are shown in Table 1.

[0033] From the test results in Table 1, it can be seen that when the amount of ammonium sulfate and sodium sulfide is 400-500g / t and 600-750g / t respectively, the amount of polyaspartic acid is 800-1000g / t, and lime and copper sulfide ore combined collector are added, pine oil is used as a foaming agent to prepare the slurry. Figure 1 During the process test, a copper concentrate with a copper grade of 14.18% and a copper recovery rate of 70.03% was obtained.

[0034] Table 1 Copper recovery test results in ore mud / %

[0035]

[0036] Comprehensive analysis shows that the sludge is injected into a three-blade variable-section impeller-type high-efficiency stirring tank for long-term stirring, ammonium sulfate and sodium sulfide are selected as a combined sulfiding agent for copper-containing sludge, polyaspartic acid is used as a dispersant for copper minerals and other sludges, the pH value of the slurry is adjusted, and a copper collector is added to recover the sulfided copper-containing fine mud, ultimately achieving the goal of efficiently recovering copper-containing minerals in the sludge.

[0037] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for recovering copper from ore slime, characterized in that: The specific steps of the method are as follows: S1) slurry mixing operation, injecting the sludge to be processed into a high-efficiency stirring tank, stirring for a certain period of time at a certain stirring rate, and obtaining a slurry in which the sludge is in a suspended and completely dispersed state; S2) adding a certain amount of combined sulfiding agent to the slurry obtained in S1) for sulfidation, adding a certain amount of dispersant after stirring for a period of time, and injecting the fully stirred slurry into the flotation machine for flotation operation; S3) flotation operation, the pulp treated by S2) enters the flotation tank for flotation operation of copper roughing section and copper scavenging section to obtain copper roughing mixed concentrate and tailings, a small amount of inhibitor and copper collector are added to the copper roughing mixed concentrate to perform copper concentration operation 1 to obtain copper concentration 1 concentrate and copper concentration 1 tailings; the copper concentration 1 concentrate is subjected to copper concentration operation 2 without adding reagents to obtain copper concentrate and copper concentration 2 tailings; the copper concentration 1 tailings are sequentially returned to the high-efficiency stirring tank, and the copper concentration 2 tailings are sequentially returned to the copper concentration 1 operation; S4) Copper tailings treatment operation: the copper scavenging tailings enter the subsequent sulfur flotation operation system to recover sulfur.

2. The method according to claim 1, characterized in that The paddle structure in the stirring tank in S1) is a three-blade variable-section stirring paddle, the stirring speed is 150-200r / min, and the stirring time is controlled to be greater than 30min.

3. The method according to claim 1, characterized in that The S1) obtains a pulp concentration of 33.33%, a floating of no more than 5%, and a particle content of 90-92% with a slurry fineness of -0.045 mm.

4. The method according to claim 1, characterized in that: The combined vulcanizing agent in S2) is a mixture of ammonium sulfate and sodium sulfide, the amount of ammonium sulfate is 400-500g / t, the amount of sodium sulfide is 600-750g / t; the dispersant is polyaspartic acid, the amount of which is 800-1000g / t.

5. The method according to claim 1, characterized in that The copper roughing time in S3) is not less than 6 minutes. During the copper roughing, a small amount of CaO is added to adjust the pH value of the ore pulp to 9.5-10.0, and ester and xanthate mixed collectors are added at 50g / t+30g / t, and 16g / t 2 # Oil; The copper scavenging time is not less than 4 minutes, and ester and xanthate mixed collector 20g / t+10g / t is added during copper scavenging; During the first copper concentration operation, lime is added to adjust the slurry pH value to 9.8-10.5, and ester collector 10g / t is added; The second copper concentration operation is blank concentration; The flotation time of copper concentration 1 and copper concentration 2 is not less than 4 minutes.

6. The method according to claim 1, characterized in that The copper grade recovered in the method is 14.18% and the copper recovery rate is 70.03%.

7. A copper concentrate, characterized in that: The copper concentrate is prepared by the method according to any one of claims 1 to 6.

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