Combined collectors for chalcopyrite flotation and their use in chalcopyrite flotation

Abstract

The application discloses a combined collector for chalcopyrite flotation and application of the combined collector in chalcopyrite flotation, and also discloses a preparation method of the combined collector, and belongs to the technical field of flotation separation of mineral processing. The combined collector is prepared by mixing ethion and an emulsifier according to a certain proportion and water, and then dispersing the mixture in an ultrasonic crusher to form a stable light yellow emulsion. The emulsion can be applied to the flotation process of chalcopyrite, and under the condition of obtaining similar flotation indexes, the combined collector of the application can be used in a significantly reduced amount compared with the amount of ethion, thereby effectively reducing the consumption of reagents, improving production efficiency, and reducing carbon emission in the separation process by reducing the amount of reagents.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing flotation and separation technology, and particularly relates to a combined collector for chalcopyrite flotation and its application in chalcopyrite flotation. Background Technology

[0002] Copper is an important strategic metallic mineral resource. Due to its excellent corrosion resistance, electrical conductivity, and thermal conductivity, copper is widely used in the chemical industry and manufacturing sectors such as electronics and machinery. With the rapid growth of the national economy, the demand for this resource is also increasing daily.

[0003] The "2021 China Mineral Resources Report" states that as of 2020, my country's copper reserves were 27.013 million tons, with per capita reserves lower than the world average and a foreign dependence exceeding 70%. my country's copper resources are mainly concentrated in the Tibet Autonomous Region, Jiangxi, and Yunnan provinces. However, my country's copper resources are characterized by: (1) few large deposits; (2) many low-grade deposits and few high-grade deposits; and (3) few single copper minerals and many associated copper minerals. This results in my country's copper production capacity falling far short of actual demand. Among the numerous copper resources, approximately 170 copper minerals are known, mainly including: native copper, chalcopyrite, chalcocite, bornite, covellite, and malachite. my country's copper resources are mainly porphyry and skarn-type copper deposits, accounting for over 70% of my country's copper resources. With the continuous development and utilization of resources, low-grade copper ore is difficult to effectively recover and utilize. Furthermore, ethyl thiocyanate, a commonly used collector in chalcopyrite flotation, has drawbacks such as large dosage and poor dispersion, and can no longer meet current production needs.

[0004] Therefore, to address the issues of high ethyl thiocyanate dosage and poor dispersion, and to improve copper ore resource utilization and reduce production costs, developing a high-performance collector is one of the keys to improving chalcopyrite flotation recovery. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a combined collector for chalcopyrite flotation and its application in chalcopyrite flotation. In addition to achieving efficient collection of chalcopyrite, the collector can reduce the amount of ethyl thiocyanate used while ensuring a high copper grade and recovery rate in the concentrate.

[0006] To solve the above technical problems, the specific technical solution of the present invention is as follows:

[0007] A combined collector for chalcopyrite flotation is prepared by mixing water, emulsifier and ethyl thiocyanate, and then ultrasonically dispersing the mixture using an ultrasonic crusher to obtain a pale yellow emulsion, which is the combined collector.

[0008] Furthermore, the emulsifier is one or more of the Tween series, Span series, and betaine series.

[0009] Furthermore, the mass ratio of the emulsifier to ethyl thiocyanate is 1:15-1:30.

[0010] Furthermore, the ultrasonic power is 500-1000W, and the ultrasonic time is 5-10min.

[0011] As a general inventive concept, this invention also provides an application of the above-mentioned combined collector in chalcopyrite flotation, characterized in that the application process includes the following steps:

[0012] (1) Grind the raw ore to obtain a slurry with a fixed concentration and grinding fineness;

[0013] (2) Add inhibitors, the combined collector and frother and fully adjust the slurry, and carry out roughing to obtain roughing concentrate and roughing tailings;

[0014] (3) The roughing concentrate is finely selected without the addition of reagents, i.e., without the addition of inhibitors, emulsifiers and frothers, to obtain fine concentrate; a combination of collectors and frothers is added to the roughing tailings for scavenging to obtain scavenged tailings.

[0015] Furthermore, in step (1), the grinding product particle size is -0.074mm, accounting for 60-90%, the grinding concentration is 50-70%, and the flotation pulp concentration is 30-50%.

[0016] Furthermore, in step (2), the inhibitor is one or a combination of CaO, sodium thiosulfate and sodium sulfate, the combined collector is an emulsifier and ethyl thiocyanate mixed with water and then ultrasonically broken into a light yellow emulsion, and the foaming agent is No. 2 oil or methyl isobutyl methanol.

[0017] Furthermore, in step (2), the inhibitor dosage is 500-800 g / t. -1 The dosage of the combined collector is 300-500 g / t. -1 The amount of foaming agent used is 20-80g / t. -1 .

[0018] Furthermore, in step (3), the selection is performed three times and the scanning is performed twice.

[0019] Furthermore, the dosage of the combined collector is 50-200 g / t for each scavenging operation. -1 The dosage of foaming agent is 5-20 g / t. -1 .

[0020] The beneficial effects of this invention are:

[0021] The combined collector prepared in this invention for chalcopyrite flotation is stable and can be stored stably for 1-3 months. Ultrasonic waves break ethyl thiocyanate into micron-sized oil droplets, and the emulsifier acts on the oil-water interface through directional adsorption, thereby improving the stability and dispersibility of the emulsified reagent. Under similar flotation performance conditions, the combined collector prepared in this invention significantly reduces the dosage compared to using ethyl thiocyanate alone. Applying the combined collector described in this invention to the chalcopyrite flotation recovery process can reduce carbon emissions in mineral processing and lower production costs by reducing the amount of flotation reagents, while ensuring flotation performance. Attached Figure Description

[0022] Figure 1 This is a flow chart of the chalcopyrite flotation and recovery process according to an embodiment of the present invention. Detailed Implementation

[0023] To further clarify the technical means and effects of this invention in achieving the intended results, the invention will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the embodiments described are only some examples of the implementation of this invention. Therefore, it should be noted that the scope of protection of this invention is not limited to the following specific embodiments; all embodiments obtained in the art based on this invention without significant inventive step are within the scope of protection of this invention.

[0024] Ore raw material: A porphyry copper mine in Inner Mongolia, with a copper content of 0.27%, an iron content of 2.75%, and a sulfur content of 1.23%. The main metallic mineral components in the ore are chalcopyrite and pyrite, while the non-metallic gangue minerals are mainly quartz, etc.

[0025] Example 1:

[0026] A combined collector for chalcopyrite flotation and its application in chalcopyrite flotation, as shown in the appendix. Figure 1 As shown, the specific operation steps are as follows:

[0027] (1) The combined collector is a mixture of water, emulsifier and ethyl thiocyanate. The mass ratio of the emulsifier dodecyl dimethyl betaine to ethyl thiocyanate is 1:30. Then, it is dispersed in an ultrasonic disruptor at a power of 800W for 10 minutes until a stable light yellow emulsion is formed.

[0028] (2) The raw ore is added to a rod mill for grinding. The grinding product particle size is controlled at -0.074mm, accounting for 65%, the grinding concentration is 60%, and the flotation pulp concentration is 40%.

[0029] (3) Feed the sample obtained in step (2) into the flotation cell, adjust the pulp to a pulp concentration of 30%, add the inhibitor sodium thiosulfate, combined collector and frother No. 2 oil in sequence, mix oil and water at room temperature with an oil content of 5%, and after fully adjusting the pulp, introduce air for roughing to obtain rough concentrate and rough tailings.

[0030] (4) The roughing concentrate is subjected to three cleaning processes without the addition of reagents. The concentrate obtained from the last cleaning process is copper concentrate. The roughing tailings are subjected to two scavenging processes. The tailings from the last scavenging process are copper tailings. The tailings from the first cleaning process are combined with the concentrate from the first scavenging process and returned to the roughing process for further cleaning. The tailings from the second cleaning process are returned to the first cleaning process for further cleaning. The concentrate from the second scavenging process is returned to the first scavenging process for further cleaning. The tailings from the third cleaning process are directly returned to the second cleaning process for further cleaning.

[0031] In steps (3) and (4) above, the amount of sodium thiosulfate used in the rough selection is 500 g / t. -1 The dosage of the combined collector is 300 g / t. -1 The dosage of oil No. 2 is 40g / t. -1 The dosage of the combined collector used in the first sweep was 150 g / t. -1 The dosage of No. 2 oil is 10g / t. -1 The combined collector dosage for the second sweep was 80 g / t. -1 The dosage of No. 2 oil is 5g / t. -1 .

[0032] Example 2:

[0033] A combined collector for chalcopyrite flotation and its application in chalcopyrite flotation, as shown in the appendix. Figure 1 As shown, the specific operation steps are as follows:

[0034] (1) The combined collector is a mixture of water, emulsifier and ethyl thiocyanate. The mass ratio of the emulsifier dodecyl dimethyl betaine to ethyl thiocyanate is 1:20. Then, it is dispersed in an ultrasonic disruptor at a power of 500W for 8 minutes until a stable light yellow emulsion is formed.

[0035] (2) The raw ore is added to a rod mill for grinding. The grinding product particle size is controlled at -0.074mm, accounting for 85%, the grinding concentration is 50%, and the flotation pulp concentration is 30%.

[0036] (3) Feed the sample obtained in step (2) into the flotation cell, adjust the pulp to a pulp concentration of 30%, add the inhibitor sodium thiosulfate, combined collector and frother No. 2 oil in sequence, mix oil and water at room temperature with an oil content of 5%, and after fully adjusting the pulp, introduce air for roughing to obtain rough concentrate and rough tailings.

[0037] (4) The roughing concentrate is subjected to three cleaning processes without the addition of reagents. The concentrate obtained from the last cleaning process is copper concentrate. The roughing tailings are subjected to two scavenging processes. The tailings from the last scavenging process are copper tailings. The tailings from the first cleaning process are combined with the concentrate from the first scavenging process and returned to the roughing process for further cleaning. The tailings from the second cleaning process are returned to the first cleaning process for further cleaning. The concentrate from the second scavenging process is returned to the first scavenging process for further cleaning. The tailings from the third cleaning process are directly returned to the second cleaning process for further cleaning.

[0038] In steps (3) and (4) above, the amount of sodium thiosulfate used in the rough selection is 800 g·t. -1 The dosage of the combined collector is 500 g / t. -1 The dosage of oil No. 2 is 50g / t. -1 The dosage of the combined collector used in the first sweep was 200 g / t. -1 The dosage of No. 2 oil is 20g / t. -1 The dosage of the combined collector used in the second sweep was 100 g / t. -1 The dosage of No. 2 oil is 10g / t. -1 .

[0039] Example 3:

[0040] A combined collector for chalcopyrite flotation and its application in chalcopyrite flotation, as shown in the appendix. Figure 1 As shown, the specific operation steps are as follows:

[0041] (1) The combined collector is a mixture of water, emulsifier and ethyl thiocyanate. The mass ratio of the emulsifier dodecyl dimethyl betaine to ethyl thiocyanate is 1:15. Then, it is dispersed in an ultrasonic disruptor at a power of 1000W for 5 minutes until a stable light yellow emulsion is formed.

[0042] (2) The raw ore is added to a ball mill for grinding. The grinding product particle size is controlled at -0.074mm, accounting for 75%, the grinding concentration is 70%, and the flotation pulp concentration is 50%.

[0043] (3) Feed the sample obtained in step (2) into the flotation cell, adjust the slurry to a slurry concentration of 30%, add the inhibitor sodium thiosulfate, combined collector and frother No. 2 oil in sequence, mix oil and water at room temperature with an oil content of 5%, and after fully adjusting the slurry, introduce air for roughing to obtain rough concentrate and rough tailings.

[0044] (4) The roughing concentrate is subjected to three cleaning processes, and the concentrate obtained from the last cleaning process is copper concentrate. The roughing tailings are subjected to two scavenging processes, and the tailings from the last scavenging process are copper tailings. The tailings from the first cleaning process are combined with the concentrate from the first scavenging process and returned to the roughing process for further cleaning; the tailings from the second cleaning process are returned to the first cleaning process for further cleaning; the concentrate from the second scavenging process is returned to the first scavenging process for further cleaning; the tailings from the third cleaning process are directly returned to the second cleaning process for further cleaning.

[0045] In steps (3) and (4) above, the amount of sodium thiosulfate used in the rough selection is 600 g·t. -1 The dosage of the combined collector is 400 g / t. -1 The dosage of oil No. 2 is 80g / t. -1 The dosage of the combined collector used in the first sweep was 150 g / t. -1 The dosage of No. 2 oil is 30g / t. -1 The combined collector dosage for the second sweep was 60 g / t. -1 The dosage of No. 2 oil is 10g / t. -1 .

[0046] Comparative Example 1:

[0047] A combined collector for chalcopyrite flotation and its application in chalcopyrite flotation, with the specific operating steps as follows:

[0048] (1) The raw ore is added to a ball mill for grinding. The particle size of the grinding product is controlled at -0.074mm, accounting for 75%, the grinding concentration is 60%, and the flotation pulp concentration is 40%.

[0049] (2) Feed the sample obtained in step (1) into the flotation cell, adjust the pulp to a pulp concentration of 30%, add the inhibitor CaO, ethyl thiocyanate and frother No. 2 oil in sequence to fully adjust the pulp, and then fill with air for roughing to obtain rough concentrate and rough tailings.

[0050] (3) The roughing concentrate is subjected to three cleaning processes, and the concentrate obtained from the last cleaning process is copper concentrate. The roughing tailings are subjected to two scavenging processes, and the tailings from the last scavenging process are copper tailings. The tailings from the first cleaning process are combined with the concentrate from the first scavenging process and returned to the roughing process for further cleaning; the tailings from the second cleaning process are returned to the first cleaning process for further cleaning; the concentrate from the second scavenging process is returned to the first scavenging process for further cleaning; the tailings from the third cleaning process are directly returned to the second cleaning process for further cleaning.

[0051] In steps (2) and (3) above, the amount of CaO used in the rough selection is 600 g·t. -1 The dosage of ethionine is 850 g / t. -1 The dosage of oil No. 2 is 80g / t. -1 The amount of ethionine used in the first sweep was 300 g / t. -1The dosage of No. 2 oil is 30g / t. -1 The amount of ethionine used in the second scavenging was 150 g / t. -1 The dosage of No. 2 oil is 10g / t. -1 .

[0052] Comparative Example 2:

[0053] A combined collector for chalcopyrite flotation and its application in chalcopyrite flotation, with the specific operating steps as follows:

[0054] (1) The raw ore is added to a rod mill for grinding. The grinding product particle size is controlled at -0.074mm, accounting for 85%, the grinding concentration is 60%, and the flotation pulp concentration is 40%.

[0055] (2) Feed the sample obtained in step (1) into the flotation cell, adjust the pulp to a pulp concentration of 30%, add the inhibitor CaO, ethyl thiocyanate and frother No. 2 oil in sequence to fully adjust the pulp, and then fill with air for roughing to obtain rough concentrate and rough tailings.

[0056] (3) The roughing concentrate is subjected to three cleaning processes, and the concentrate obtained from the last cleaning process is copper concentrate. The roughing tailings are subjected to two scavenging processes, and the tailings from the last scavenging process are copper tailings. The tailings from the first cleaning process are combined with the concentrate from the first scavenging process and returned to the roughing process for further cleaning; the tailings from the second cleaning process are returned to the first cleaning process for further cleaning; the concentrate from the second scavenging process is returned to the first scavenging process for further cleaning; the tailings from the third cleaning process are directly returned to the second cleaning process for further cleaning.

[0057] In steps (2) and (3) above, the amount of CaO used in the rough selection is 800 g·t. -1 The dosage of ethionine is 1030 g / t. -1 The dosage of oil No. 2 is 50g / t. -1 The amount of ethionine used in the first sweep was 500 g / t. -1 The dosage of No. 2 oil is 20g / t. -1 The amount of ethionine used in the second scavenging was 250 g / t. -1 The dosage of No. 2 oil is 10g / t. -1 .

[0058] The experimental results of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1 below:

[0059] Table 1. Experimental results of Examples 1-3 and Comparative Examples 1-2

[0060]

[0061] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. In other words, any embodiments obtained in the art based on the present invention without significant inventive improvements are within the scope of protection of the present invention.

Claims

1. The application of a combined collector in the flotation of chalcopyrite, characterized in that, The application process includes the following steps: (1) Grinding the raw ore to obtain a slurry with a fixed concentration and grinding fineness; (2) Add inhibitors, combined collectors and frothers and fully adjust the slurry, and carry out roughing to obtain roughing concentrate and roughing tailings; (3) The roughing concentrate is cleaned without the addition of reagents to obtain cleaned concentrate; the combined collector and frother are added to the roughing tailings for scavenging to obtain scavenged tailings; The combined collector is prepared by mixing water, emulsifier and ethyl thiocyanate, and then dispersing by ultrasonication to obtain a light yellow emulsion, which is the combined collector; the mass ratio of the emulsifier and ethyl thiocyanate is 1:15-1:

30.

2. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, The emulsifier is one or more of the Tween series, Span series, and betaine series.

3. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, Use an ultrasonic disruptor to ultrasonically disperse the mixture until a pale yellow emulsion is formed. The ultrasonic power is 500-1000W and the ultrasonic time is 5-10 minutes.

4. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, The grinding product particle size of step (1) is -0.074mm, accounting for 60-90%, the grinding concentration is 50-70%, and the flotation pulp concentration is 30-50%.

5. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, The inhibitor mentioned in step (2) is one or a combination of CaO, sodium thiosulfate and sodium sulfate, and the foaming agent is No. 2 oil or methyl isobutyl methanol.

6. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, The dosage of the inhibitor mentioned in step (2) is 500-800 g·t. -1 The dosage of the combined collector is 300-500 g / t. -1 The amount of foaming agent used is 20-80g / t. -1 .

7. The application of the combined collector according to claim 1 in the flotation of chalcopyrite, characterized in that, The number of times the drug-free selection is carried out in step (3) is three, and the number of times the sweeping is two.

8. The application of the combined collector according to claim 7 in the flotation of chalcopyrite, characterized in that, The dosage of the combined scavenging collector is 50-200 g / t each time. -1 The dosage of foaming agent is 5-30 g / t. -1 .

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