Beneficiation method for improving beneficiation recovery rate of complex copper smelting slag

Abstract

The invention discloses a method for effectively improving the beneficiation recovery rate of complex copper smelting slag, which comprises the following steps of: adding a flotation step in an ore grinding-grading circulation process, and collecting by using a novel copper slag combined collecting agent; sheet metal copper and part of copper-containing minerals difficult to grind in a repeated circulation module in the closed-loop ball milling process are separated out in a flotation mode in advance, the ore grinding environment is optimized, and the ore grinding efficiency is improved. According to the method, the novel copper slag combined collecting agent is adopted for collecting coarse fraction components in the ore pulp, the collecting effect is effectively improved, and the selectivity of metal copper in the ore pulp is improved.

Description

Technical Field

[0001] The invention belongs to the field of tailings recovery and treatment, and in particular relates to a ore dressing method for improving the ore dressing recovery rate of complex copper smelting slag. Background Art

[0002] Copper is a national strategic metal mineral resource. my country's copper resources are quite scarce, and with the rapid growth of domestic copper demand and the improvement of smelting capacity, there is a serious shortage of domestic copper concentrate in my country, and the external dependence is as high as more than 70%. In recent years, with the continuous development of my country's copper smelting industry, copper mines containing 0.2% to 0.3% copper have been mined and utilized on a large scale, while the copper content of slag produced in the copper smelting process is more than 0.7%, and most copper smelters produce smelting slag containing more than 4% copper. Therefore, how to efficiently recycle the copper resources in copper smelting slag is of great practical significance to my country at this stage.

[0003] At present, the domestic main methods of recovering copper from smelting slag are electric furnace depletion method and mineral processing method. The former is difficult to ensure that the copper content of the abandoned slag is controlled below 0.65%, and the latter requires large initial investment, but the copper recovery rate is relatively high. The flotation method is often affected by the raw material structure of the front-end pyrometallurgical smelting and the slag structure after slag cooling. For example, if impurities such as lead matte and sodium matte are added to the raw material end, and after the discharge is cooled, the slag contains higher copper oxide and metallic copper, or the crystals of the copper-containing component are small, all of which will have a greater impact on the flotation results.

[0004] At present, many domestic copper smelting enterprises mix the first-cycle slag and the second-cycle slag in a certain proportion and transport them to the slag concentrator to recover the copper in the slag by flotation. However, the second-cycle blowing slag is often harder than the first-cycle smelting slag, and the slag contains a large amount of metallic copper embedded with fine particles. It takes longer to grind to a specified fineness. In addition, due to its good ductility, the metallic copper is often produced in flakes after crushing and grinding, which is difficult to achieve the required fineness requirements. As a result, a large amount of coarse-grained slag and flake metallic copper are repeatedly circulated in the subsequent grinding and grading closed-circuit process. The classification return sand rate of some slag concentrators reaches more than 300%, which greatly increases the mill load and increases production energy consumption. In addition, the high coarse-grained content in the material affects the grading efficiency, which in turn affects the production indicators and reduces the recovery rate. The coarse-grained components such as metallic copper in the slag are continuously enriched in the mill, resulting in the copper grade of the circulating material reaching three times the feed grade in the subsequent closed-circuit grinding process, which has a huge impact on the stability of production indicators. Some copper smelting enterprises also separate the first-cycle slag and the second-cycle slag for separate beneficiation. However, in the process of processing the second-cycle slag, the above-mentioned impact becomes more serious. The energy consumption generated by separately sorting the second-cycle slag is more than 20% higher than that of separately sorting the first-cycle slag. The production cost is high and the grade of the tailings after flotation is much higher than the latter, resulting in serious loss of resources. Summary of the invention

[0005] The object of the present invention is to provide a ore dressing method for improving the ore dressing recovery rate of complex copper smelting slag, by increasing slurry flotation and adding a new copper slag combined collector, the collection effect of coarse particle components is improved and the copper recovery rate is improved.

[0006] The present invention provides a ore dressing method for improving the ore dressing recovery rate of complex copper smelting slag, comprising the following steps:

[0007] S1. Obtaining the recovered slag from the copper smelting process, grinding it to obtain a mixed material;

[0008] S2. The mixture obtained in step S1 is subjected to a stage of classification to obtain a stage of classified concentrate and a stage of classified tailings;

[0009] S3. The classified tailings obtained in step S2 are subjected to a ball milling step, and then flotation 1 is performed to obtain a flotation concentrate 1 and a flotation tailing 1;

[0010] S4. flotation 2 is performed on the classified concentrate obtained in step S2 to obtain a flotation concentrate 2 and a flotation tailing 2;

[0011] S5. The flotation tailings 2 obtained in step S4 are subjected to two-stage classification to obtain a two-stage classified concentrate and a two-stage classified tailings;

[0012] S6. performing roughing on the second-stage classified concentrate obtained in step S5 to obtain a roughing concentrate and a roughing tailings;

[0013] S7. The rougher concentrate obtained in step S6 is subjected to concentrating 1 to obtain a concentrating concentrate 1 and a concentrating tailings 1;

[0014] S8. The rougher tailings obtained in step S6 are subjected to scavenging 1 to obtain scavenging concentrate 1 and scavenging tailings 1;

[0015] S9. Perform scavenging 2 on the scavenging tailings 1 obtained in step S8 to obtain scavenging concentrate 2 and scavenging tailings 2;

[0016] S10. The flotation concentrate 1, the flotation concentrate 2 and the concentrated concentrate 1 are combined, concentrated and filtered to obtain a slag concentrate.

[0017] In step S1, the grinding process is to first crush the recovered slag to less than -600mm, then perform semi-autogenous grinding and pass through a -8mm linear vibrating screen, and the obtained under-screen slurry mixture is used for the next step, and the screened sand is returned to the semi-autogenous grinding step.

[0018] The slurry concentration of the ore pulp under the screen is 50% to 60%, and the material fineness is -200 mesh and not less than 60%.

[0019] In step S2, the slurry of the mixed material obtained in step S1 is added to a first-stage cyclone for first-stage classification, and the slurry overflowing from the cyclone is used as the first-stage classified concentrate, and the sediment is used as the first-stage classified tailings.

[0020] In step S3, the flotation tailings obtained by flotation 1 are returned to a classification step; the concentration of the ball milling in the first stage is 75% to 80%; the reagent system of the flotation 1 is: 75 to 125 g / t of a new copper slag combined collector, 65 to 75 g / t of pine oil, and a flotation time of more than 3 minutes; the new copper slag combined collector includes butyl xanthate, O-ethyl-N-benzoylthiocarbamate, 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT) and butyl ammonium black medicine, wherein the mass ratio of butyl xanthate: O-ethyl-N-benzoylthiocarbamate: 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT): butyl ammonium black medicine is (4 to 6):3:1:1.

[0021] In step S4, the slurry concentration of the first-stage classified concentrate is 40% to 45%, and the material fineness is -324 mesh not less than 70%; the reagent system of the flotation 2 is: butyl xanthate 100 to 150 g / t, pine oil 65 to 75 g / t.

[0022] In step S5, the flotation tailings 2 slurry obtained in step S4 is added to the second-stage cyclone for second-stage classification, the slurry overflowing from the cyclone is used as the second-stage classification concentrate, and the sediment is used as the second-stage classification tailings.

[0023] In step S6, the slurry concentration of the second-stage classified concentrate is not less than 30%, and the material fineness is -325 mesh not less than 85%; the reagent system for the roughing is: butyl xanthate 60-70g / t, pine oil 25-35g / t.

[0024] In step S7, no medicine is added to the selection 1.

[0025] The reagent system of the scanning 1 in step S8 is: 20-30 g / t of butyl xanthate and 8-12 g / t of pine oil.

[0026] The reagent system for the scavenging 2 in step S9 is: 8-12 g / t of butyl xanthate.

[0027] Further, the second-stage classification tailings are subjected to second-stage ball milling, wherein the second-stage ball milling concentration is 75%-80%, and the obtained product is combined with the concentrated tailings 1, the scavenged concentrate 1 and the scavenged concentrate 2, and returned to the second-stage classification step.

[0028] The scavenging tailings 2 are subjected to a concentration and filtration step to obtain tailings.

[0029] Beneficial effects of the present invention:

[0030] (1) The present invention adds a flotation process in the grinding-classification process, and flots and separates the flaky copper and some difficult-to-grind copper-containing minerals in the repeated circulation module in the closed-circuit ball milling process in advance, thereby optimizing the grinding environment and improving the grinding efficiency;

[0031] (2) The present invention adopts a new type of copper slag combined collector to capture the coarse-grained components in the slurry, which effectively improves the capture effect and improves the selectivity for metallic copper therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A process flow chart of a method according to an embodiment of the present invention;

[0033] Figure 2 This is a process flow chart of the method of Comparative Example 1 of the present invention;

[0034] Figure 3 This is a process flow chart of the method of Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0035] The embodiments of the present invention and the comparative examples are both based on slag produced by a domestic copper smelter. The ratio of the first-cycle slag to the second-cycle slag produced by the smelter is 5:1. During the production process, the two are produced according to a 5:1 batching ratio. The copper grade of the comprehensive slag ore is 5%-6%, and the main impurity components are fayalite and ferrosilicon.

[0036] Example 1

[0037] A method for improving the recovery rate of complex copper smelting slag, the process flow diagram of which is as follows Figure 1 As shown, the following steps are included:

[0038] S1. Obtain copper slag, firstly crush it to below -600mm, then semi-autogenous grinding and passing through -8mm linear vibrating screen, the obtained slurry mixture under the screen is used for the next step, and the sand settling on the screen is returned to the semi-autogenous grinding step;

[0039] S2. Add the mixed slurry obtained in step S1 to a hydrocyclone for a stage of classification, and the slurry overflowing from the hydrocyclone is used as a stage of classified concentrate, and the sediment is used as a stage of classified tailings;

[0040] S3. The classified tailings obtained in step S2 are subjected to a ball milling step, and then flotation 1 is performed to obtain a flotation concentrate 1 and a flotation tailing 1;

[0041] The reagent system of the flotation 1 is: 100 g / t of the new copper slag combined collector, 70 g / t of pine oil, and the flotation time is more than 3 minutes; the new copper slag combined collector includes butyl xanthate, O-ethyl-N-benzoylthiocarbamate, 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT) and butyl ammonium black medicine, wherein the mass ratio of butyl xanthate: O-ethyl-N-benzoylthiocarbamate: 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT): butyl ammonium black medicine is 5:3:1:1;

[0042] The flotation tailings obtained from flotation 1 are returned to a classification step;

[0043] S4. flotation 2 is performed on the classified concentrate obtained in step S2 to obtain a flotation concentrate 2 and a flotation tailing 2;

[0044] The reagent system of flotation 2 is: 125g / t butyl xanthate, 70g / t pine oil;

[0045] S5. Add the flotation tailings 2 obtained in step S4 into the second-stage hydrocyclone for second-stage classification, and the slurry overflowing from the hydrocyclone is used as the second-stage classification concentrate, and the sediment is used as the second-stage classification tailings;

[0046] S6. performing roughing on the second-stage classified concentrate obtained in step S5 to obtain a roughing concentrate and a roughing tailings;

[0047] The reagent system for the rough selection is: 65g / t of butyl xanthate and 30g / t of pine oil;

[0048] S7. The rougher concentrate obtained in step S6 is subjected to a concentration 1, wherein no reagent is added to the concentration 1, to obtain a concentrated concentrate 1 and a concentrated tailings 1;

[0049] S8. The rougher tailings obtained in step S6 are subjected to scavenging 1 to obtain scavenging concentrate 1 and scavenging tailings 1;

[0050] The reagent system of the sweep 1 is: 25g / t of butyl xanthate and 10g / t of pine oil;

[0051] S9. Perform scavenging 2 on the scavenging tailings 1 obtained in step S8 to obtain scavenging concentrate 2 and scavenging tailings 2;

[0052] The reagent system of the sweep 2 is: butyl xanthate 10g / t;

[0053] S10. The flotation concentrate 1, the flotation concentrate 2 and the concentrated concentrate 1 are combined, concentrated and filtered to obtain a slag concentrate.

[0054] The secondary classification tailings are subjected to secondary ball milling, and the obtained products are combined with the concentrated tailings 1, scavenged concentrate 1 and scavenged concentrate 2, and returned to the secondary classification step.

[0055] Comparative Example 1

[0056] The only difference between Comparative Example 1 and Example 1 is that butyl xanthate is used in flotation 1 to replace the new copper slag combined collector, and the other steps and conditions remain unchanged. The process flow diagram is shown in FIG. Figure 2 shown.

[0057] Comparative Example 2

[0058] The difference between Comparative Example 2 and Comparative Example 1 is that the flotation step 1 and the concentration step 1 are deleted, and the first-stage classification tailings are directly returned to the first-stage classification step after a stage of ball milling, and the other steps and conditions remain unchanged. The process flow diagram is shown in FIG. Figure 3 shown.

[0059] The concentrate grade, tailings grade and recovery rate indicators obtained for Example 1, Comparative Example 1 and Comparative Example 2 are shown in Table 1, Table 2 and Table 3.

[0060] Table 1 Product indicators of Example 1

[0061] Product Name Yield Cu Grade Cu recovery rate Flotation concentrate 1 12.12 27.12 65.22 Flotation concentrate 2 5.72 23.92 27.15 Concentrate 1 1.92 12.51 4.77 Slag concentrate 19.76 24.77 97.13 Tailings 80.24 0.180 2.87 total 100 5.04 100

[0062] Table 2 Product indicators of comparative example 1

[0063] Product Name Yield Cu Grade Cu recovery rate Flotation concentrate 1 11.72 26.92 62.60 Flotation concentrate 2 6.43 22.62 28.86 Concentrate 1 2.07 12.54 5.15 Slag concentrate 20.22 24.08 96.61 Tailings 79.78 0.214 3.39 total 100 5.04 100

[0064] Table 3 Product indicators of comparative example 2

[0065] Product Name Yield Cu Grade Cu recovery rate Slag concentrate 22.03 21.94 96.08 Tailings 77.97 0.253 3.92 total 100 5.03 100

[0066] By comparing Table 2 and Table 3, it can be seen that the copper recovery rate of Comparative Example 1 is 0.53% higher than that of Comparative Example 2, and the effect is obvious. It effectively improves the utilization rate of copper resources and reduces resource waste. The concentrate grade is increased by 2.14%, and the concentrate output rate is reduced by 1.81%, which can effectively reduce the production cost in the later copper smelting process.

[0067] By comparing Table 1 and Table 2, it can be seen that, by using the new copper slag combined collector in Example 1, the copper recovery rate is higher than that of using butyl xanthate alone as the collector, and the copper recovery rate of flotation 1 is increased by 2.62%, and the slag concentrate recovery rate is further increased by 0.52%, indicating that the new copper slag combined collector has enhanced the capture and selectivity of the copper slag flotation, and obtained a better recovery rate index, and the concentrate grade is further increased by 0.69%, and the concentrate output rate is reduced by 0.46%.

[0068] By comparing Table 1, Table 2 and Table 3, it can be concluded that by adding flotation process to the grinding-classification cycle process and using a new copper slag combined collector with superior collection and selection performance, the recovery rate was increased by 1.05% and the concentrate output rate was reduced by 2.27%, effectively realizing the maximization of comprehensive benefits.

Claims

1. A method for improving the recovery rate of complex copper smelting slag, characterized in that: The following steps are involved: S1. Obtaining the recovered slag from the copper smelting process, grinding it to obtain a mixed material; S2. The mixture obtained in step S1 is subjected to a stage of classification to obtain a stage of classified concentrate and a stage of classified tailings; S3. The classified tailings obtained in step S2 are subjected to a ball milling step, and then flotation 1 is performed to obtain a flotation concentrate 1 and a flotation tailing 1; S4. flotation 2 is performed on the classified concentrate obtained in step S2 to obtain a flotation concentrate 2 and a flotation tailing 2; S5. The flotation tailings 2 obtained in step S4 are subjected to two-stage classification to obtain a two-stage classified concentrate and a two-stage classified tailings; S6. performing roughing on the second-stage classified concentrate obtained in step S5 to obtain a roughing concentrate and a roughing tailings; S7. The rougher concentrate obtained in step S6 is subjected to concentrating 1 to obtain a concentrating concentrate 1 and a concentrating tailings 1; S8. The rougher tailings obtained in step S6 are subjected to scavenging 1 to obtain scavenging concentrate 1 and scavenging tailings 1; S9. Perform scavenging 2 on the scavenging tailings 1 obtained in step S8 to obtain scavenging concentrate 2 and scavenging tailings 2; S10. The flotation concentrate 1, the flotation concentrate 2 and the concentrated concentrate 1 are combined, concentrated and filtered to obtain a slag concentrate.

2. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S1, the grinding process is to first crush the recovered slag to less than -600mm, then semi-autogenous grinding and passing through a -8mm linear vibrating screen, and the obtained under-screen slurry mixture is used for the next step, and the screened sand is returned to the semi-autogenous grinding step; the slurry concentration of the under-screen slurry is 50% to 60%, and the material fineness is -200 mesh not less than 60%.

3. The ore dressing method for improving the ore dressing recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S2, the slurry of the mixed material obtained in step S1 is added to a first-stage cyclone for first-stage classification, and the slurry overflowing from the cyclone is used as the first-stage classified concentrate, and the sediment is used as the first-stage classified tailings.

4. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S3, the flotation tailings obtained by flotation 1 are returned to a classification step; the concentration of the ball milling in the first stage is 75%-80%; the reagent system of the flotation 1 is: 75-125g / t of a new copper slag combined collector, 65-75g / t of pine oil, and a flotation time of more than 3min; the new copper slag combined collector includes butyl xanthate, O-ethyl-N-benzoylthiocarbamate, 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT) and butyl ammonium black medicine, wherein the mass ratio of butyl xanthate: O-ethyl-N-benzoylthiocarbamate: 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT): butyl ammonium black medicine is (4-6):3:1:

1.

5. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S4, the slurry concentration of the first-stage classified concentrate is 40% to 45%, and the material fineness is -324 mesh not less than 70%; the reagent system of the flotation 2 is: butyl xanthate 100 to 150 g / t, pine oil 65 to 75 g / t.

6. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S5, the flotation tailings 2 slurry obtained in step S4 is added to the second-stage cyclone for second-stage classification, the slurry overflowing from the cyclone is used as the second-stage classification concentrate, and the sediment is used as the second-stage classification tailings.

7. The ore dressing method for improving the ore dressing recovery rate of complex copper smelting slag according to claim 1, characterized in that: In step S6, the slurry concentration of the second-stage classified concentrate is not less than 30%, and the material fineness is -325 mesh not less than 85%; the reagent system for the roughing is: butyl xanthate 60-70g / t, pine oil 25-35g / t.

8. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: No reagent is added in the selection 1 of step S7; the reagent system of the scavenging 1 of step S8 is: butyl xanthate 20-30 g / t, pine oil 8-12 g / t; the reagent system of the scavenging 2 of step S9 is: butyl xanthate 8-12 g / t.

9. The ore dressing method for improving the recovery rate of complex copper smelting slag according to claim 1, characterized in that: The second-stage classification tailings are subjected to second-stage ball milling, wherein the second-stage ball milling concentration is 75%-80%, and the obtained product is combined with the beneficiated tailings 1, scavenged concentrate 1 and scavenged concentrate 2, and returned to the second-stage classification step.

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