A method for improving the flotation effect of chalcopyrite by using modified sodium sulfide

Abstract

The application discloses a method for improving the chalcopyrite flotation effect by using modified sodium sulfide, and the method comprises the following steps: S1, placing a sodium sulfide solution in a container; S2, winding copper enameled wire with 60-160 N turns around the container, connecting the copper enameled wire with a signal generator and a power supply, and connecting the water outlet pipe and the water return pipe of a water pump with the container, so that the sodium sulfide solution in the container can circulate; S3, electrifying the copper enameled wire to generate magnetism by the signal generator, and magnetizing and pretreating the sodium sulfide solution, the magnetization time is 3-10 min, and the modified sodium sulfide solution after magnetization treatment is obtained; and S4, adding the modified sodium sulfide after magnetization treatment into a chalcopyrite flotation system, separately filtering and weighing the flotation concentrate and the flotation tailings, and testing the copper grade in the flotation concentrate and the flotation tailings.

Description

Technical Field

[0001] This invention relates to the field of mineral processing techniques, and in particular to a method for improving the flotation effect of chalcopyrite using modified sodium sulfide. Background Technology

[0002] Chalcopyrite is currently the most important copper-bearing mineral, exhibiting excellent natural floatability within a neutral pH range. However, in highly alkaline environments, surface oxidation is severe, leading to a large amount of compounds such as ferric hydroxide covering the mineral surface, drastically reducing floatability. Therefore, in modern chalcopyrite beneficiation processes, activators are often added to eliminate the negative effects of surface oxidation.

[0003] Activators play a crucial role in flotation because they can improve mineral recovery by altering the hydrophobicity of the target mineral's surface. Activators for copper ore mainly include inorganic activators such as sodium sulfide, sodium hydrosulfide, and ammonium sulfate. Currently, sodium sulfide is the most widely used because it acts as a sulfiding agent for copper oxide minerals. Liu Dianwen et al. from Kunming University of Science and Technology validated the activator using pure malachite minerals, concluding that the recovery effect of malachite was optimal when ammonium sulfide and sodium sulfide were used in a near 1:1 ratio. Mao Surong studied a copper oxide ore in Tibet, using DZ-602 as an activator, mixed with sodium sulfide, and obtained a copper concentrate with a recovery rate of 69.21% and a grade of 17.13%.

[0004] Several patents report the application of magnetized water in agriculture and purification, but the application of magnetization technology to enhance mineral leaching is less common. When water undergoes magnetization pretreatment, new hydrogen bond networks can form, thereby altering the water's cluster structure. Compared to ordinary water, magnetized water has reduced density and viscosity, weakened surface tension, and greater activity, as well as better dissolving and penetrating abilities. Wang Yubin's team previously used magnetization technology to pretreat No. 2 oil, and experimental results showed that the magnetized No. 2 oil exhibited stronger dispersibility, increasing the recovery rate of galena to 82.60%. Therefore, this research aims to increase the proportion of sodium sulfide activating component through magnetization modification, reducing its dosage without affecting its activation effect, ultimately improving the flotation efficiency of chalcopyrite. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for improving the flotation effect of chalcopyrite using modified sodium sulfide.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A method for improving the flotation effect of chalcopyrite using modified sodium sulfide includes the following steps:

[0008] S1. Place the sodium sulfide solution in a container;

[0009] S2. Wrap 60-160 N copper enameled wire around the container, connect the copper enameled wire to the power supply through a signal generator, and connect the water pump's outlet and return pipes to the container so that the sodium sulfide solution in the container can circulate.

[0010] S3. The copper enameled wire is energized and magnetized by a signal generator, and the sodium sulfide solution is pre-treated by magnetization for 3-10 min to obtain the modified sodium sulfide solution after magnetization.

[0011] S4. Modified sodium sulfide after magnetization treatment is added to the chalcopyrite flotation system, wherein the amount of activator is 80g / t, the amount of collector is 70g / t, the amount of No. 2 oil is 49g / t, and the amount of ester 205 is 28g / t. After the flotation is completed, the flotation concentrate and flotation tailings are filtered and weighed separately, the copper grade is analyzed, and the copper recovery rate in the flotation concentrate is calculated.

[0012] The current frequency of the signal generator is 0.01–1.0 MHz.

[0013] The beneficial effects of this invention are: after the sodium sulfide solution is pretreated by magnetization, its viscosity changes, its dispersion performance is good, and it is easier to contact the target mineral in the flotation operation, which is beneficial to the flotation recovery of chalcopyrite concentrate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the effect of the magnetized modified sodium sulfide of the present invention on copper ore recovery rate;

[0015] Figure 2 This is a schematic diagram illustrating the effect of magnetized modified sodium sulfide of this invention on the grade of copper concentrate. Detailed Implementation

[0016] 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 and the accompanying drawings. 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 techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0017] Example 1

[0018] A method for improving the flotation effect of chalcopyrite using modified sodium sulfide includes the following steps:

[0019] S1. Place the sodium sulfide solution in a container;

[0020] S2. Wrap a copper enameled wire with 60 N turns around the container, connect the copper enameled wire to the power supply through a signal generator, and connect the water pump's outlet pipe and return pipe to the container so that the sodium sulfide solution in the container can circulate.

[0021] S3. The copper enameled wire is energized and magnetized by a signal generator, and the sodium sulfide solution is pre-treated by magnetization for 3 minutes to obtain the modified sodium sulfide solution after magnetization.

[0022] S4. Modified sodium sulfide after magnetization treatment is added to the chalcopyrite flotation system, wherein the amount of activator is 80g / t, the amount of collector is 70g / t, the amount of No. 2 oil is 49g / t, and the amount of ester 205 is 28g / t. After the flotation is completed, the flotation concentrate and flotation tailings are filtered and weighed separately, the copper grade is analyzed, and the copper recovery rate in the flotation concentrate is calculated.

[0023] The current frequency of the signal generator is 0.01 kHz.

[0024] Example 2

[0025] A method for improving the flotation effect of chalcopyrite using modified sodium sulfide includes the following steps:

[0026] S1. Place the sodium sulfide solution in a container;

[0027] S2. Wrap a copper enameled wire with 160 N turns around the container, connect the copper enameled wire to the power supply through a signal generator, and connect the water pump's outlet pipe and return pipe to the container so that the sodium sulfide solution in the container can circulate.

[0028] S3. The copper enameled wire is energized and magnetized by a signal generator, and the sodium sulfide solution is pre-treated by magnetization for 10 min to obtain the modified sodium sulfide solution after magnetization.

[0029] S4. Modified sodium sulfide after magnetization treatment is added to the chalcopyrite flotation system, wherein the amount of activator is 80g / t, the amount of collector is 70g / t, the amount of No. 2 oil is 49g / t, and the amount of ester 205 is 28g / t. After the flotation is completed, the flotation concentrate and flotation tailings are filtered and weighed separately, the copper grade is analyzed, and the copper recovery rate in the flotation concentrate is calculated.

[0030] The current frequency of the signal generator is 1 kHz.

[0031] Example 3

[0032] A method for improving the flotation effect of chalcopyrite using modified sodium sulfide includes the following steps:

[0033] S1. Weigh 500 g of copper ore and grind it to a grinding fineness of 75% at a grinding concentration of 50% to obtain a sodium sulfide solution. Place the sodium sulfide solution in a container.

[0034] S2. The activator sodium sulfide is subjected to magnetization pretreatment. The magnetization pretreatment conditions are shown in the table below:

[0035] ,

[0036] Among them, group 0 was the control group, and groups 1-4 were the experimental groups;

[0037] S3. The copper enameled wire is energized and magnetized by a signal generator, and the sodium sulfide solution is pre-treated by magnetization to obtain a modified sodium sulfide solution after magnetization treatment.

[0038] S4. Add the control group and the experimental group to the chalcopyrite flotation system respectively. After the flotation is completed, filter and weigh the flotation concentrate and flotation tailings respectively, test the copper grade, and calculate the copper recovery rate in the flotation concentrate.

[0039] The AC frequency was 0.10 MHz, the waveform was sine wave, the flotation test was carried out in a 3.0 L flotation cell, the dosage of sodium sulfide was 80 g / t, the dosage of collector was 70 g / t, the dosage of No. 2 oil was 49 g / t, the dosage of ester 205 was 28 g / t, and the flotation time was 3 min. Finally, the flotation concentrate was filtered, dried, and weighed. The copper grade of the concentrate was tested before the recovery rate of chalcopyrite was calculated.

[0040] Depend on Figure 1 It can be seen from the comprehensive analysis of experiments 1, 2, 3, 4 and experiment 0 that the recovery rate of copper ore was significantly improved after the sodium sulfide was magnetized. The recovery rate of copper ore was the best when the magnetization time was 3 min and the number of coil turns was 80 N, reaching 95.78%.

[0041] Depend on Figure 2 It can be seen from the comprehensive analysis of experiments 1, 2, 3, 4 and experiment 0 that the copper grade was significantly improved after the sodium sulfide magnetization modification. Moreover, the copper grade was optimal, reaching 6.67%, when the magnetization time was 3 min and the number of coil turns was 130 N.

[0042] Comprehensive analysis Figure 1It can be seen that: comparing experiments 1 and 2, it can be found that under the same magnetization time, the number of coil turns during magnetization has a negative impact on the copper concentrate recovery rate; comparing experiments 3 and 4, it can be found that under the same magnetization time, the number of coil turns during magnetization has a negative impact on the copper concentrate recovery rate; comparing experiments 1 and 3, it can be found that under the same number of coil turns during magnetization, the magnetization time has a negative impact on the copper concentrate recovery rate; comparing experiments 2 and 4, it can be found that under the same number of coil turns during magnetization, the magnetization time has a positive impact on the copper concentrate recovery rate.

[0043] Comprehensive analysis Figure 2 It can be seen that: comparing experiments 1 and 2, it can be found that under the same magnetization time, the number of coil turns during magnetization has a positive effect on the copper concentrate grade; comparing experiments 3 and 4, it can be found that under the same magnetization time, the number of coil turns during magnetization has a negative effect on the copper concentrate grade; comparing experiments 1 and 3, it can be found that under the same magnetization time, the magnetization time has a positive effect on the copper concentrate grade; comparing experiments 2 and 4, it can be found that under the same magnetization time, the magnetization time has a negative effect on the copper concentrate grade.

[0044] The method described in this invention can be adjusted according to actual conditions in industrial applications, such as grinding fineness and collector dosage, to further improve the copper ore recovery rate and copper concentrate grade.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for improving the flotation effect of chalcopyrite using modified sodium sulfide, characterized in that, Includes the following steps: S1. Place the sodium sulfide solution in a container; S2. Wrap 60-160 N copper enameled wire around the container, connect the copper enameled wire to the power supply through a signal generator, and connect the water pump's outlet and return pipes to the container so that the sodium sulfide solution in the container can circulate. S3. The copper enameled wire is energized and magnetized by a signal generator, and the sodium sulfide solution is pre-treated by magnetization for 3-10 min to obtain the modified sodium sulfide solution after magnetization. S4. Modified sodium sulfide after magnetization treatment is added to the chalcopyrite flotation system, wherein the amount of activator is 80g / t, the amount of collector is 70g / t, the amount of No. 2 oil is 49g / t, and the amount of ester 205 is 28g / t. After the flotation is completed, the flotation concentrate and flotation tailings are filtered and weighed separately, the copper grade is analyzed, and the copper recovery rate in the flotation concentrate is calculated.

2. The method for improving the flotation effect of chalcopyrite using modified sodium sulfide according to claim 1, characterized in that, The current frequency of the signal generator is 0.01–1.0 MHz.

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