Activating agent for malachite flotation and malachite flotation method thereof

Abstract

The invention discloses an activating agent for malachite flotation and a malachite flotation method thereof, and belongs to the technical field of mineral processing. The activating agent for malachite flotation is pyridine methanol. Compared with the traditional malachite activator sodium sulfide, the method provided by the invention adopts pyridine methanol to activate malachite, so that a higher recovery rate can be obtained. Meanwhile, the pyridinemethanol has certain foaming performance, so that the dosage of a foaming agent can be reduced, and the medicament cost is further reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to an activator for activating malachite flotation and a method for flotating malachite. Background Art

[0002] As mineral resources tend to be more and more "poor, fine and mixed", the selectivity continues to decline, the requirements for the comprehensive recovery rate of copper resources, the quality of concentrate products and the separation effect are constantly improved, and the continuous mining and utilization of ores, the proportion of easily selected sulfide copper ores is decreasing, and the development and utilization of high oxidation rate copper minerals are facing important challenges. Malachite is a very typical copper oxide mineral. The efficient use of difficult-to-select copper oxide resources is of great significance to the sustainable development of copper resources.

[0003] At present, the sulfide-xanthate flotation method is commonly used to select difficult-to-select oxidized copper ores. The activation of the activator in the sulfide-xanthate flotation method is the most critical link and plays a key role in the sulfide-xanthate flotation method. Activation is to change the hydrophilicity of the oxidized ore by adding an activator to form a hydrophobic film on the surface of the oxidized ore. The activators commonly used at present are sodium sulfide or sodium hydrosulfide. This type of activator has the problems of slow reaction, easy oxidation, poor stability of the hydrophobic film formed, and easy detachment of the film formed under the action of the complex flow field of the slurry. In addition, the dosage is difficult to control. Too little dosage cannot guarantee sufficient reducing atmosphere and cannot achieve the activation effect, while too much dosage will have a significant inhibitory effect on flotation. At present, the reagents for activating the flotation of malachite are relatively single, so the development of oxidized ore activation reagents has a great expansion significance for the sulfide-xanthate flotation method. Summary of the invention

[0004] The main purpose of the present invention is to provide an activator for malachite flotation and a method for flotating malachite. During the flotation process, pyridinemethanol effectively activates the malachite, improves the recovery rate, and achieves high recovery of the malachite.

[0005] To achieve the above object, the present invention provides an activator for malachite flotation, which is pyridinemethanol, and its structural formula is:

[0006]

[0007] The present invention also claims a method for flotation of malachite with the activator, comprising the following steps:

[0008] (1) crushing the copper ore containing malachite, and then grinding it with water to a fineness of -0.074 mm accounting for 80% of the slurry;

[0009] (2) The ore pulp is subjected to two roughing selections, two scavenging selections, and two concentrating selections in sequence to obtain copper concentrate, and an activator is added in the first roughing selection.

[0010] As a further improvement of the present invention, in the step (2), an inhibitor, an activator, a collector and a frother are added to the ore pulp, and then a first roughing is performed.

[0011] As a further improvement of the present invention, the inhibitor is sodium hexametaphosphate and water glass, and the added amounts are 500 g / t and 1000 g / t respectively.

[0012] As a further improvement of the present invention, the added amount of the activator is 500-600 g / t.

[0013] As a further improvement of the present invention, the collector is a combination of butyl yellow and pentyl yellow, and the addition amount is 80g / t; the foaming agent is 2# oil, and the addition amount is 10g / t.

[0014] As a further improvement of the present invention, in the step (2), in the second rough selection, the amount of the collector added is 50 g / t; the amount of the foaming agent added is 10 g / t.

[0015] As a further improvement of the present invention, in the first sweep, the added amount of the collector is 30 g / t, and the added amount of the foaming agent is 10 g / t; in the second sweep, the added amount of the collector is 20 g / t, and the added amount of the foaming agent is 10 g / t.

[0016] The principle of the present invention is that pyridinemethanol chelates with the copper site on the surface of malachite and adsorbs on the surface of malachite, thereby increasing the hydrophobicity of the surface of malachite and promoting the adsorption of xanthate. The addition of pyridinemethanol effectively improves the flotation effect of malachite. At the same time, pyridinemethanol and 2# oil both have -OH groups, so they have certain foaming properties, which can reduce the amount of the foaming agent 2# oil.

[0017] The beneficial effects of the present invention are as follows: compared with the traditional malachite activator sodium sulfide, the present invention uses pyridine methanol for activation to obtain a higher recovery rate, and the dosage is half of that of sodium sulfide. At the same time, pyridine methanol has a certain foaming property, which can reduce the dosage of the foaming agent, thereby reducing the cost of the agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a process flow chart of the method for activating the flotation of malachite using an activator. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] The selected raw ore contains 1.0% copper, and the oxidation rate of copper minerals reaches 75%. The copper minerals mainly exist in the form of chalcopyrite and malachite, and the gangue minerals are mainly quartz and calcite.

[0022] A method for activating the flotation of malachite using an activator, comprising the following steps:

[0023] (1) Weigh the raw ore and crush it to -3 mm. Then add water and put it into a ball mill and grind it to -0.074 mm. The ore pulp accounting for 80% is then added into a single tank flotation machine for flotation test.

[0024] (2) Add 500 g / t of sodium hexametaphosphate and 1000 g / t of water glass into the slurry as gangue inhibitors.

[0025] (3) Add 500 g / t of pyridine methanol and stir for 3 minutes, then add 80 g / t of a combination of butyl yellow and pentyl yellow, add 10 g / t of 2# oil and stir for 3 minutes, then scrape and foam for 8 minutes.

[0026] (4) Add a combination of butyl yellow and pentyl yellow at a concentration ratio of 50 g / t and 2# oil at a concentration ratio of 10 g / t, stir for 3 minutes, and then scrape and foam for 7 minutes to obtain a mixed coarse concentrate and rougher tailings.

[0027] (5) The roughing tailings are subjected to scavenging operation. In the first scavenging, a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 30 g / t and 10 g / t of 2# oil are added. In the second scavenging, a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 20 g / t and 10 g / t of 2# oil are added, and finally, scavenging concentrate No. 1, scavenging concentrate No. 2 and final tailings are obtained.

[0028] (6) The coarse concentrate was mixed for concentration operation. After two concentrations, the first concentrate and the final copper concentrate were obtained. No chemicals were added in the two concentrations. The test results of the final copper concentrate are shown in Table 1.

[0029] Example 2

[0030] The selected raw ore contains 1.0% copper, and the oxidation rate of copper minerals reaches 75%. The copper minerals mainly exist in the form of chalcopyrite and malachite, and the gangue minerals are mainly quartz and calcite.

[0031] A method for activating the flotation of malachite using an activator, comprising the following steps:

[0032] (1) Weigh the raw ore and crush it to -3 mm. Then add water and put it into a ball mill and grind it to -0.074 mm. The ore pulp accounting for 80% is then added into a single tank flotation machine for flotation test.

[0033] (2) Add 500 g / t of sodium hexametaphosphate and 1000 g / t of water glass into the slurry as gangue inhibitors.

[0034] (3) Add 600 g / t of pyridine methanol and stir for 3 minutes, then add 80 g / t of a combination of butyl yellow and pentyl yellow, add 10 g / t of 2# oil and stir for 3 minutes, then scrape and foam for 8 minutes.

[0035] (4) Add a combination of butyl yellow and pentyl yellow at a concentration ratio of 50 g / t and 2# oil at a concentration ratio of 10 g / t, stir for 3 minutes, and then scrape and foam for 7 minutes to obtain a mixed coarse concentrate and rougher tailings.

[0036] (5) The roughing tailings are subjected to scavenging operation. In the first scavenging, a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 30 g / t and 10 g / t of 2# oil are added. In the second scavenging, a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 20 g / t and 10 g / t of 2# oil are added, and finally, scavenging concentrate No. 1, scavenging concentrate No. 2 and final tailings are obtained.

[0037] (6) The coarse concentrate was mixed for concentration operation. After two concentrations, the first concentrate and the final copper concentrate were obtained. No chemicals were added in the two concentrations. The test results of the final copper concentrate are shown in Table 1.

[0038] Comparative Example 1

[0039] The selected raw ore contains 1.0% copper, and the oxidation rate of copper minerals reaches 75%. The copper minerals mainly exist in the form of chalcopyrite and malachite, and the gangue minerals are mainly quartz and calcite.

[0040] A method for flotation of malachite by using an activator to enhance the activator comprises the following steps:

[0041] (1) Weigh the raw ore and crush it to -3 mm. Then add water and put it into a ball mill and grind it to -0.074 mm. The ore pulp accounting for 80% is then added into a single tank flotation machine for flotation test.

[0042] (2) Add 500 g / t of sodium hexametaphosphate and 1000 g / t of water glass into the slurry as gangue inhibitors.

[0043] (3) Add 400g / t sodium sulfide and stir for 3 minutes, then add 80g / t of a combination of butyl yellow and pentyl yellow, add 20g / t of 2# oil and stir for 3 minutes, then scrape and foam for 8 minutes.

[0044] (4) 300 g / t of sodium sulfide was added and stirred for 3 min, and a combination of butyl yellow and pentyl yellow with a concentration ratio of 50 g / t and 2# oil with a concentration ratio of 10 g / t were added and stirred for 3 min, and then scraped and foamed for 7 min to obtain a mixed coarse concentrate and a rough tailings.

[0045] (5) The roughing tailings are subjected to scavenging operation. For the first scavenging, 200 g / t of sodium sulfide is added and stirred for 3 minutes, and a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 30 g / t, and 10 g / t of No. 2 oil are added. For the second scavenging, 100 g / t of sodium sulfide is added and stirred for 3 minutes, and a combination of collectors of butyl yellow and pentyl yellow with a concentration ratio of 20 g / t, and 10 g / t of No. 2 oil are added, and finally, scavenging concentrate No. 1, scavenging concentrate No. 2, and final tailings are obtained.

[0046] (6) The coarse concentrate was mixed for concentration operation. After two concentrations, the first concentrate and the final copper concentrate were obtained. No chemicals were added in the two concentrations. The test results of the final copper concentrate are shown in Table 1.

[0047] Table 1

[0048]

[0049]

[0050] As shown in Table 1, in Comparative Example 1, 1000 g / t of sodium sulfide was added in stages at a ratio of 4:3:2:1 in two roughing selections and two scavenging selections for activation flotation, and the yield of copper concentrate was 3.35%, the recovery rate of copper in copper concentrate could reach 84.64%, and the recovery rate of malachite could reach 71.99%. However, the method of directly adding pyridine methanol for activation flotation to treat mixed copper ore containing malachite, the yield of copper concentrate was 3.44%, the recovery rate of copper in copper concentrate could reach 86.75%, and the recovery rate of malachite was 73.20%. It can be seen from this that compared with adding sodium sulfide for activation flotation, the recovery rate was 2.11 points higher when adding pyridine methanol as an activator, and the recovery rate of malachite was 1.21 points higher when the dosage was half of that of sodium sulfide, which effectively recovered the malachite in the original ore and reduced the cost of reagents.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An activator for malachite flotation, characterized in that: The activating agent is pyridinemethanol.

2. A method for flotation of malachite using the activator according to claim 1, characterized in that: The steps include: (1) crushing the copper ore containing malachite, and then grinding it with water to a fineness of -0.074 mm accounting for 80% of the slurry; (2) The ore pulp is subjected to two roughing selections, two scavenging selections, and two concentrating selections in sequence to obtain copper concentrate, and an activator for malachite flotation is added in the first roughing selection.

3. The method for flotation of malachite according to claim 2, characterized in that: In the step (2), an inhibitor, an activator, a collector and a frother are added to the ore pulp, and then a first roughing is performed.

4. The method for flotation of malachite according to claim 3, characterized in that: The inhibitors are sodium hexametaphosphate and water glass, and the added amounts are 500 g / t and 1000 g / t respectively.

5. The method for flotation of malachite according to claim 3, characterized in that: The added amount of the activator used for malachite flotation is 500-600 g / t.

6. The method for flotation of malachite according to claim 3, characterized in that: The collector is a combination of butyl yellow and pentyl yellow, and the addition amount is 80g / t; the foaming agent is 2# oil, and the addition amount is 10g / t.

7. The method for flotation of malachite according to claim 3, characterized in that: In the step (2), the amount of collector added in the second rough selection is 50 g / t, and the amount of foaming agent added is 10 g / t.

8. The method for flotation of malachite according to claim 3, characterized in that: In the first sweep, the amount of collector added is 30g / t, and the amount of frother added is 10g / t; in the second sweep, the amount of collector added is 20g / t, and the amount of frother added is 10g / t.

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