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

Abstract

The application discloses a method for effectively improving the beneficiation recovery rate of complex copper smelting slag, and adds a flotation step in a grinding-classification circulation process, and uses a novel copper slag combined collector for collection, so that flaky metallic copper and part of difficult-to-grind copper-containing minerals in a repeated circulation module in a closed-circuit ball milling process are floated and separated in advance, a grinding environment is optimized, and grinding efficiency is improved. The novel copper slag combined collector is used for collecting coarse-grained components in the ore pulp, the collection effect is effectively improved, and the selectivity to metallic copper is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of tailings recovery and treatment, and particularly relates to a beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag. BACKGROUND

[0002] Copper is a national strategic metal mineral resource. The copper content of slag produced in the copper smelting process is above 0.7%, and the copper content of most copper smelting slag is above 4%. Therefore, how to efficiently recover and utilize the copper resources in the copper smelting slag has important practical significance for China at the present stage.

[0003] At present, the domestic copper smelting slag is mainly recovered by an electric furnace dilution method and a beneficiation method. The former is difficult to ensure that the copper content of the discarded slag is controlled below 0.65%, and the latter has a relatively high copper recovery rate, but has a large initial investment. The flotation method is often affected by the raw material structure of the front-end pyrometallurgical process and the slag structure after the slag is cooled, such as the addition of lead and sodium matte and other impurities into the raw material end, and the presence of a large amount of fine-grained and embedded metallic copper in the slag after the slag is cooled, which will greatly affect the flotation results.

[0004] At present, many domestic copper smelting enterprises uniformly mix the first cycle slag and the second cycle slag according to a certain proportion, and then transport the mixed slag to a slag beneficiation plant to recover the copper in the slag by the flotation method. However, the second cycle slag has a higher hardness than the first cycle slag, and the slag contains a large amount of fine-grained and embedded metallic copper. Therefore, the time required for grinding to the specified fineness is longer, and the metallic copper is often in the form of a sheet after being crushed and ground due to its good ductility, which is difficult to meet the required fineness requirement. This causes a large amount of coarse-grained slag and sheet-shaped metallic copper to be repeatedly circulated in the subsequent closed-circuit grinding and classification process, and the classification return sand rate of some slag beneficiation plants is above 300%, which greatly increases the load of the mill and the production energy consumption. In addition, the high content of coarse particles in the material affects the classification efficiency, which in turn affects the production index and reduces the recovery rate. The continuous enrichment of coarse particles such as metallic copper in the slag in the mill leads to a copper grade of the circulating material that is three times higher than the feed material, which greatly affects the stability of the production index. Some copper smelting enterprises separately select the first cycle slag and the second cycle slag, but the above-mentioned problems are more serious in the process of treating the second cycle slag. The energy consumption of separately selecting the second cycle slag is 20% higher than that of separately selecting the first cycle slag, and the production cost is high. In addition, the tailings after flotation have a much higher grade than the tailings after the first cycle slag is separately selected, which causes serious resource loss. SUMMARY

[0005] The purpose of the present application is to provide a beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag. By increasing the slurry conditioning and flotation and adding a new type of copper slag combined collector, the collection effect of coarse particles is improved, and the copper recovery rate is improved.

[0006] The application provides a beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag, comprising the following steps:

[0007] S1. Obtaining the recovered slag material in the copper ore smelting process, performing grinding treatment to obtain a mixed material;

[0008] S2. Performing one-stage classification on the mixed material obtained in step S1 to obtain one-stage classified concentrate and one-stage classified tailings;

[0009] S3. Performing one-stage ball milling on the one-stage classified tailings obtained in step S2, and then performing flotation 1 to obtain flotation concentrate 1 and flotation tailings 1;

[0010] S4. Performing flotation 2 on the one-stage classified concentrate obtained in step S2 to obtain flotation concentrate 2 and flotation tailings 2;

[0011] S5. Performing two-stage classification on the flotation tailings 2 obtained in step S4 to obtain two-stage classified concentrate and two-stage classified tailings;

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

[0013] S7. Performing cleaning 1 on the roughing concentrate obtained in step S6 to obtain cleaning concentrate 1 and cleaning tailings 1;

[0014] S8. Performing scavenging 1 on the roughing tailings obtained in step S6 to obtain scavenging concentrate 1 and scavenging tailings 1;

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

[0016] S10. Merging the flotation concentrate 1, the flotation concentrate 2 and the cleaning concentrate 1, and performing concentration filtration to obtain slag concentrate.

[0017] In step S1, the grinding treatment is first crushing the recovered slag material to below 600 mm, then performing semi-milling and passing through an 8 mm linear vibrating screen, and the undersize slurry mixture obtained is used in the next step, and the oversize sand returns to the semi-milling step.

[0018] The slurry concentration of the undersize slurry is 50% to 60%, and the material fineness is not less than 60% of 200 mesh.

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

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

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

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

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

[0024] In step S7, the cleaning 1 does not add reagents.

[0025] In step S8, the reagent system of the cleaning 1 is as follows: 20-30 g / t of butyl xanthate and 8-12 g / t of pine oil.

[0026] In step S9, the reagent system of the cleaning 2 is as follows: 8-12 g / t of butyl xanthate.

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

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

[0029] The beneficial effects of the present application are as follows:

[0030] (1) The application adds a flotation process in the grinding-classification process, and the flaky copper and part of the difficult-to-grind copper-containing minerals in the repeated circulation module in the closed-circuit ball milling process are floated and sorted in advance, so that the grinding environment is optimized, and the grinding efficiency is improved;

[0031] (2) The new copper slag combined collector is used to collect the coarse grain components in the ore pulp, so that the collection effect is effectively improved, and the selectivity to the copper is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The process flow chart of the method of the embodiment of the application is shown in the figure;

[0033] Figure 2 The process flow chart of the method of the comparative example 1 of the application is shown in the figure;

[0034] Figure 3 The process flow chart of the method of the comparative example 2 of the application is shown in the figure. DETAILED DESCRIPTION

[0035] The embodiment and the comparative example of the application both use the slag produced by a domestic copper smelting plant as the object, the ratio of the one-cycle slag to the two-cycle slag of the smelting plant is 5:1, and the two are proportioned at 5:1 during production, the comprehensive slag ore contains 5%-6% of copper, and the main impurity components are fayalite and siliceous fayalite.

[0036] Example 1

[0037] A beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag, the process flow chart is shown in the figure Figure 1 , and includes the following steps:

[0038] S1. Obtain the copper slag, first perform coarse crushing treatment to below-600mm, then perform semi-autogenous grinding and pass through an-8mm linear vibrating screen, the obtained undersize ore pulp mixture is used for the next step, and the oversize sand returns to the semi-autogenous grinding step;

[0039] S2. The ore pulp mixture obtained in step S1 is added to a first cyclone for first-stage classification, the overflow of the cyclone is used as the first-stage classification concentrate, and the sand is used as the first-stage classification tailings;

[0040] S3. The first-stage classification tailings obtained in step S2 are subjected to first-stage ball milling, and then subjected to flotation 1, to obtain flotation concentrate 1 and flotation tailings 1;

[0041] The reagent system of the flotation 1 is: 100 g / t of a new copper residue combined collector, 70 g / t of pine oil, and a flotation time of more than 3 min; the new copper residue combined collector comprises butyl xanthate, O-ethyl-N-benzoyl thiocarbamate, 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-benzoyl thiocarbamate: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 in the flotation 1 are returned to the first-stage classification step;

[0043] S4. The first-stage classification concentrate obtained in step S2 is subjected to a flotation 2 to obtain a flotation concentrate 2 and a flotation tailings 2;

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

[0045] S5. The flotation tailings 2 obtained in step S4 are added to a second-stage cyclone for second-stage classification, and the overflow of the cyclone is taken as a second-stage classification concentrate, and the underflow is taken as a second-stage classification tailings;

[0046] S6. The second-stage classification concentrate obtained in step S5 is subjected to roughing to obtain a roughing concentrate and a roughing tailings;

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

[0048] S7. The roughing concentrate obtained in step S6 is subjected to a cleaning 1, and the cleaning 1 does not add reagents to obtain a cleaning concentrate 1 and a cleaning tailings 1;

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

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

[0051] S9. The scavenging tailings 1 obtained in step S8 are subjected to a scavenging 2 to obtain a scavenging concentrate 2 and a scavenging tailings 2;

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

[0053] S10. The flotation concentrate 1, the flotation concentrate 2 and the cleaning concentrate 1 are combined and subjected to concentration filtration to obtain a slag concentrate.

[0054] The two-stage classification tailings are subjected to two-stage ball milling, and the product is combined with the cleaned tailings 1, the scavenging concentrate 1 and the scavenging concentrate 2, and returned to the two-stage classification step.

[0055] Comparative Example 1

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

[0057] Comparative Example 2

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

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

[0060] Table 1 Product indicators of Example 1

[0061] Product name Yield Cu grade Cu recovery Flotation concentrate 1 12.12 27.12 65.22 Flotation concentrate 2 5.72 23.92 27.15 Cleaner concentrate 1 1.92 12.51 4.77 Slag concentrate 19.76 24.77 97.13 Tails 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 Flotation concentrate 1 11.72 26.92 62.60 Flotation concentrate 2 6.43 22.62 28.86 Cleaner concentrate 1 2.07 12.54 5.15 Slag concentrate 20.22 24.08 96.61 Tails 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 Slag concentrate 22.03 21.94 96.08 Tails 77.97 0.253 3.92 Total 100 5.03 100

[0066] Comparing Tables 2 and 3, it can be seen that the copper recovery rate of Comparative Example 1 is increased by 0.53% compared with Comparative Example 2, the effect is more obvious, the copper resource utilization rate is effectively improved, the resource waste is reduced, and the concentrate grade is increased by 2.14%, the concentrate yield is decreased by 1.81%, which can effectively reduce the production cost in the later copper smelting process.

[0067] Comparing Tables 1 and 2, it can be seen that by using the new copper slag combined collector in Example 1, the copper recovery rate of the flotation 1 is increased by 2.62% compared with using butyl xanthate as the collector alone, and the slag concentrate recovery rate is further increased by 0.52%, which shows that the new copper slag combined collector has improved the collecting property and selectivity of the copper slag flotation, and better recovery rate indicators are obtained, and the concentrate grade is further increased by 0.69%, and the concentrate yield is decreased by 0.46%.

[0068] Comparing Table 1, Table 2 and Table 3, it can be concluded that by adding the flotation process in the grinding-classification circulation process and using the new copper slag combined collector with superior collecting and selecting performance, the recovery rate is increased by 1.05%, the concentrate yield is decreased by 2.27%, and the maximization of comprehensive benefits is effectively realized.

Claims

1. A beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag, characterized in that, The method comprises the following steps: S1. obtaining a recovery slag in a copper smelting process, performing grinding treatment to obtain a mixed material; S2. performing first-stage classification on the mixed material obtained in step S1 to obtain first-stage classified concentrate and first-stage classified tailings; S3. performing first-stage ball milling on the first-stage classified tailings obtained in step S2, and then performing flotation 1 to obtain flotation concentrate 1 and flotation tailings 1; S4. performing flotation 2 on the first-stage classified concentrate obtained in step S2 to obtain flotation concentrate 2 and flotation tailings 2; S5. performing second-stage classification on the flotation tailings 2 obtained in step S4 to obtain second-stage classified concentrate and second-stage classified tailings; S6. performing roughing on the second-stage classified concentrate obtained in step S5 to obtain roughing concentrate and roughing tailings; S7. performing cleaning 1 on the roughing concentrate obtained in step S6 to obtain cleaning concentrate 1 and cleaning tailings 1; S8. performing scavenging 1 on the roughing tailings obtained in step S6 to obtain scavenging concentrate 1 and scavenging tailings 1; S9. performing scavenging 2 on the scavenging tailings 1 obtained in step S8 to obtain scavenging concentrate 2 and scavenging tailings 2; S10. combining the flotation concentrate 1, the flotation concentrate 2 and the cleaning concentrate 1, and performing concentration filtration to obtain slag concentrate. In step S3, the flotation tailings obtained by the flotation 1 are returned to the first-stage classification step; the grinding concentration of the first-stage ball milling is 75%-80%; the reagent system of the flotation 1 is as follows: 75~125g / t of a new copper slag combined collector, 65~75g / t of pine oil, and a flotation time of more than 3 minutes; the new copper slag combined collector comprises butyl xanthate, O-ethyl-N-benzoyl thioglycolate, 5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT) and butylamine black medicine, and the mass ratio of butyl xanthate:O-ethyl-N-benzoyl thioglycolate:5-(2,4,4-trimethylpentyl)-4-amino-1,2,4-triazolidine-3-thione (TMATT):butylamine black medicine is (4~6):3:1:1; In step S5, the flotation tailings 2 slurry obtained in step S4 is added to a second-stage cyclone for second-stage classification, and the overflow of the cyclone is taken as the second-stage classified concentrate, and the sand is taken as the second-stage classified tailings.

2. The beneficiation method for improving the beneficiation recovery rate of complex copper smelting slag according to claim 1, characterized in that, In step S1, the grinding treatment is first crushing the recovery slag to below 600 mm, then semi-autogenous grinding and passing through an 8 mm linear vibrating screen, and the undersize slurry mixture is used for the next step, and the oversize sand is returned to the semi-autogenous grinding step; the slurry concentration of the undersize slurry is 50%~60%, and the material fineness is not less than 60% of -200 mesh.

3. The beneficiation method for improving the beneficiation 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 overflow of the cyclone is taken as the first-stage classified concentrate, and the sand is taken as the first-stage classified tailings.

4. The beneficiation method for improving the beneficiation 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%~45%, and the material fineness is not less than 70% of -324 mesh; the reagent system of the flotation 2 is as follows: 100~150g / t of butyl xanthate and 65~75g / t of pine oil.

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

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

7. The beneficiation method of claim 1, wherein the beneficiation method is characterized by, The two-stage classification tailings are subjected to two-stage ball milling, the two-stage ball milling grinding concentration is 75%-80%, and the obtained product is combined with the cleaning tailings 1, the scavenging concentrate 1 and the scavenging concentrate 2, and is returned to the two-stage classification step.

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