A method for preparing a copper sulphide ore collector using waste engine oil and its use

Abstract

This invention discloses a method for preparing a collector for copper sulfide ore using waste engine oil and its application. Using waste engine oil as raw material, the method first removes solid particles through impurity removal, then homogenizes and emulsifies the purified waste engine oil to obtain the waste engine oil collector. During the flotation of copper sulfide ore, the ore is first ground to a suitable fineness, and the pH of the slurry is adjusted. Subsequently, the waste engine oil collector and a frother are added, and roughing is performed to obtain a copper concentrate. The copper concentrate is then subjected to blank cleaning to obtain a copper concentrate. This invention for preparing a collector for copper sulfide ore using waste engine oil is simple and easy to implement, with low recycling costs. The flotation process for copper sulfide ore does not require the addition of large amounts of lime, making it environmentally friendly and practically applicable, generating significant social, economic, and environmental benefits.

Description

Technical Field

[0001] This invention belongs to the field of mineral flotation technology and relates to a method for preparing copper sulfide ore collectors using waste engine oil and its application. Background Technology

[0002] In modern industrial production, lubricants are widely used, and countries with higher levels of industrialization typically consume more. Currently, China, as the world's largest emerging economy, is accelerating its industrialization process, leading to a rapid increase in its consumption of lubricants and resulting in the generation of large quantities of waste lubricating oil and grease. Waste engine oil is a type of waste lubricating oil. Under the working environment of machinery, waste engine oil undergoes high-temperature, high-pressure oxidation, thermal decomposition, and contamination by impurities, causing its physicochemical properties to reach their respective oil change standards, thus becoming a type of harmful pollutant oil. If appropriate methods are not adopted to treat or regenerate this waste engine oil, it will inevitably cause serious harm to the ecological environment and result in enormous energy waste.

[0003] Global oil reserves are declining, and petroleum products are considered necessities and will remain so for a long time to come. Recycling waste engine oil can help alleviate my country's oil resource shortage. Although my country has conducted considerable research on waste engine oil treatment and regeneration and has developed some waste engine oil treatment and purification processes, the recycling rate is still relatively low, which cannot meet the requirements of my country's economic and environmental development.

[0004] Xanthates, thiocyanates, thiocyanates, and sulfur-nitrogen collectors are common collectors used in copper sulfide flotation. However, they also present some problems and challenges. For example, some compounds in xanthates and thiocyanates are toxic, posing potential risks to the environment and human health; thiocyanates and sulfur-nitrogen collectors may have negative impacts on water bodies and soil, especially when released into the environment, potentially causing water pollution and other ecological problems.

[0005] Waste engine oil mainly consists of a large amount of aromatic hydrocarbons and alkanes, which have shown certain collecting properties in the flotation of some ores. According to literature reports, the proportion of oxidized substances such as carboxylic acids, esters, ketones, and alcohols is relatively low, below 20%. Waste engine oil contains high levels of heavy metal ions, mechanical impurities, and solid impurities, and directly using it as a flotation collector may pollute the environment. A controllable method can be used to separate the solid impurities from the waste engine oil by forming precipitates through centrifugation, thus reducing pollution. The preparation of copper sulfide ore collectors from waste engine oil is simple and easy, with low recycling costs; the flotation process for copper sulfide ore does not require the addition of large amounts of lime, making it environmentally friendly and practically applicable, generating significant social, economic, and environmental benefits. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to propose a method for preparing a copper sulfide ore collector using waste engine oil and its application. This preparation method is simple, has controllable quality, low recycling costs (turning waste into treasure), and high added value, making it valuable for practical application. Furthermore, the flotation process for copper sulfide ore does not require the addition of large amounts of lime, making it environmentally friendly and practically applicable, generating significant social, economic, and environmental benefits.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] Using waste engine oil as raw material, solid particles are first removed by impurity removal, and then the purified waste engine oil is homogenized and emulsified to obtain a waste engine oil collector. In the flotation process of copper sulfide ore, the ore is first ground to a suitable fineness and the pH of the slurry is adjusted; then the waste engine oil collector and frother are added, and roughing is performed to obtain a copper rough concentrate; the copper rough concentrate is then subjected to blank cleaning to obtain a copper concentrate.

[0009] In a preferred embodiment, waste engine oil is used as raw material. The collected waste engine oil is dispersed by stirring and then subjected to solid-liquid separation to obtain liquid A. The obtained liquid A is mixed with water and homogenized and emulsified under high-speed shearing to obtain liquid B, which is the waste engine oil collector.

[0010] Further optimized solutions include the following steps:

[0011] Step 1: Removing impurities from waste engine oil

[0012] The collected waste oil is stirred and dispersed before solid-liquid separation to obtain liquid A.

[0013] Step 2: Homogenization and Emulsification

[0014] Liquid A obtained in step one is mixed with water and homogenized and emulsified under high-speed shear to obtain liquid B, which is the waste oil collector. In step two, the mass ratio of liquid A to water is greater than or equal to 0.1; the high-speed shear rate is greater than or equal to 8000 rpm.

[0015] Preferably, in step one, the waste engine oil is one or more of the following: mineral lubricating oil, semi-synthetic lubricating oil, and fully synthetic lubricating oil from automotive engine waste lubricating oil.

[0016] Preferably, in step one, the stirring rate is 100 rpm to 300 rpm, and the stirring time is 0.5 h to 2 h; the solid-liquid separation is carried out by centrifugation, with a centrifugation speed of 12000 rpm to 15000 rpm and a centrifugation time of 0.5 h to 4 h.

[0017] Preferably, in step two, the mass ratio of liquid A to water is 1:1 to 1:10; the high-speed shear rate is 10000-15000 rpm. In this invention, the amount (mass) of waste oil liquid A used to remove solid impurities must be equal to the amount of water used, which is significantly different from the prior art. In this invention, using too much waste oil liquid A to remove solid impurities will reduce the copper recovery rate and significantly reduce the grade of copper concentrate.

[0018] As a further preferred option, in step two, the high-speed shear rate is 12,000-15,000 rpm. This invention employs high-speed shearing to achieve better emulsification. In particular, when the mass ratio of liquid A to water is 1:5-10, the separation effect is significantly improved.

[0019] The waste oil collector prepared according to this invention needs to be used within 30 days.

[0020] This invention discloses a method for preparing a collector for copper sulfide ore using waste engine oil. First, the copper sulfide ore is ground to a fineness of -200 mesh (50%-80%). The pH of the slurry is adjusted to 8-9.5, preferably 8.5-9.5, before adding the waste engine oil collector. A frother is then added. The concentrate obtained from the first roughing process is a copper rough concentrate, and the tailings are copper roughing tailings. The copper rough concentrate undergoes 1-3 blank cleaning processes to obtain a copper concentrate. The copper roughing tailings undergo 1-3 scavenging processes, with the waste engine oil collector added each time. The scavenged tailings are the tailings.

[0021] Preferably, the copper sulfide ore is an ore containing one or more minerals selected from chalcopyrite, chalcocite, bornite, and covellite.

[0022] Preferably, the crude amount of waste oil collector is 50–500 g / t. More preferably, it is 100–400 g / t.

[0023] Preferably, the foaming agent is one or more of No. 2 oil and MIBC, and the crude selection amount is 10-30g / t.

[0024] Preferably, the amount of collector used in each sweep is 0.1 to 0.5 times that used in the roughing sweep.

[0025] In this invention, the collector is composed of a mixture of centrifuged liquid and water in a 1:1 mass ratio. During roughing, the amount used is 100-200 g / t. The roughing process uses 100 g / t of collector, with two scavenging stages. The first scavenging uses 50 g / t of collector, and the second uses 25 g / t. This method can achieve a copper recovery rate of over 88% and a grade greater than 22.2%.

[0026] In this invention, the collector is composed of a mixture of centrifuged liquid and water at a mass ratio of 1:5 to 8. During roughing, its dosage is 100-400 g / t. Using 200 g / t of collector in the roughing process, with two scavenging stages (100 g / t for the first scavenging and 50 g / t for the second), can achieve a copper recovery rate of over 89.3% and a grade greater than 25.5%. Compared to a 400 g / t roughing scheme, using 200 g / t significantly reduces reagent consumption.

[0027] In this invention, the collector is composed of a mixture of centrifuged liquid and water at a mass ratio of 1:10. During roughing, the amount used is 100-400 g / t. The roughing process uses 400 g / t of collector, with two scavenging stages. The first scavenging uses 200 g / t of collector, and the second uses 100 g / t. This method can achieve a copper recovery rate of over 89.5% and a grade greater than 23%.

[0028] The principles and advantages of this invention:

[0029] Waste engine oil mainly consists of a large amount of aromatic hydrocarbons and alkanes, which have shown certain collecting properties in the flotation of some ores. According to literature reports, the proportion of oxidized substances such as carboxylic acids, esters, ketones, and alcohols is relatively low, below 20%. Waste engine oil contains high levels of heavy metal ions, mechanical impurities, and solid impurities; directly using waste engine oil as a flotation collector may pollute the environment. This invention uses a controllable method to separate solid impurities from waste engine oil by forming precipitates through centrifugation, thus reducing pollution. The preparation of a copper sulfide ore collector from waste engine oil is simple and easy to implement, and the recycling cost is low, turning waste into a valuable resource.

[0030] The present invention provides a simple and easy method for preparing copper sulfide ore collectors from waste engine oil. The method is of controllable quality, has low recycling cost, high added value, and has practical application value. It can generate significant social, economic and environmental benefits.

[0031] The copper sulfide ore collector prepared from waste engine oil provided by this invention has good selectivity and can efficiently separate copper sulfide minerals from other gangue minerals, which has a significant effect on improving the grade of copper sulfide and removing harmful impurities.

[0032] The process of flotation copper sulfide ore does not require the addition of large amounts of lime, making it green and environmentally friendly. It has practical application value and can generate significant social, economic and environmental benefits. Attached Figure Description

[0033] Figure 1 This is a flowchart of the preparation process for waste engine oil collectors.

[0034] Figure 2Flowchart for the flotation of copper sulfide ore using waste engine oil collector. Detailed Implementation

[0035] The following examples are intended to further illustrate the present invention, but not to limit it.

[0036] Example 1-1

[0037] Using waste automotive mineral lubricating oil as raw material, and employing the method provided by this invention for preparing a copper sulfide ore collector from waste engine oil, the specific preparation steps are as follows: First, the waste engine oil collector is prepared.

[0038] 1) Stir the collected waste oil at 250 rpm for 2 hours, then centrifuge at 12000 rpm for 2 hours, and collect the liquid after centrifugation.

[0039] 2) Mix the liquid collected by centrifugation with water at a mass ratio of 1:5, and place it in a homogenizer for high-speed shearing at 15,000 rpm for 30 minutes to obtain waste oil collector.

[0040] The prepared waste engine oil collector was applied to a small-scale closed-circuit flotation test of copper sulfide ore. The copper content in the experimental raw material was 0.51%, and the sulfur content was 3.69%. Mineralogical analysis showed that the main metallic minerals in the sample were pyrite and chalcopyrite. The specific experimental steps are as follows:

[0041] 1) Ball mill the copper sulfide ore to a fineness of -200 mesh, with 65% of the ore being copper sulfide.

[0042] 2) Add lime to adjust the pH of the slurry to 9.0, then add 200g / t of waste engine oil collector and 20g / t of No. 2 oil in sequence for a roughing process;

[0043] 3) The rough concentrate after roughing is subjected to two blank cleaning processes, and the cleaned concentrate is copper concentrate.

[0044] 4) The coarse tailings after roughing are subjected to two scavenging processes. 100g / t of waste oil collector is added for scavenging 1, and 50g / t of waste oil collector is added for scavenging 2.

[0045] The experimental results are shown in Table 1-1.

[0046] The experimental results show that the method for preparing copper sulfide ore collectors using waste engine oil and its application, provided by this invention, is highly effective. Small-scale closed-circuit laboratory tests yielded a copper concentrate with a copper grade of 25.68%, achieving a copper recovery rate of 89.31%.

[0047] Table 1-1

[0048]

[0049] Examples 1-2

[0050] The other conditions are the same as in Example 1-1, except that:

[0051] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:5 and placed in a homogenizer for high-speed shearing at 10,000 rpm for 120 minutes to obtain the waste oil collector.

[0052] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0053] Add lime to adjust the pH of the slurry to 9.0, then add 100g / t of waste engine oil collector and 20g / t of No. 2 oil in sequence for a roughing process;

[0054] The rough tailings after roughing are subjected to two scavenging processes. 75 g / t of waste oil collector is added during scavenging process 1, and 50 g / t of waste oil collector is added during scavenging process 2.

[0055] The test results are shown in Table 1-2.

[0056] The experimental results show that, using the method of preparing copper sulfide ore collector from waste engine oil provided by this invention, a small-scale closed-circuit laboratory test can obtain a copper concentrate with a copper grade of 25.88% and a copper recovery rate of 87.77%.

[0057] Table 1-2

[0058]

[0059] Examples 1-3

[0060] The other conditions are the same as in Example 1-1, except that:

[0061] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:5 and placed in a homogenizer for high-speed shearing at 12,000 rpm for 200 minutes to obtain the waste oil collector.

[0062] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0063] Add lime to adjust the pH of the slurry to 9.0, then add 400g / t of waste engine oil collector and 20g / t of No. 2 oil in sequence for a roughing process;

[0064] The coarse tailings after roughing were subjected to two scavenging processes. Scavenging process 1 involved adding 100 g / t of waste oil collector, and scavenging process 2 involved adding 50 g / t of waste oil collector. The test results are shown in Tables 1-3.

[0065] The experimental results show that, using the method of preparing copper sulfide ore collector from waste engine oil provided by this invention, a small-scale closed-circuit test in the laboratory can obtain copper concentrate with a copper grade of 23.39% and a copper recovery rate of 89.55%.

[0066] Table 1-3

[0067]

[0068] Examples 1-4

[0069] The other conditions are the same as in Example 1-1, except that:

[0070] The liquid collected by centrifugation is mixed with water at a mass ratio of 1:1;

[0071] The prepared waste oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore. The experimental results are shown in Tables 1-4.

[0072] The experimental results show that, using the method of preparing copper sulfide ore collector from waste engine oil provided by this invention, a small-scale closed-circuit laboratory test can obtain a copper concentrate with a copper grade of 24.66% and a copper recovery rate of 89.47%.

[0073] Table 1-4

[0074]

[0075] Examples 1-5

[0076] The other conditions are the same as in Example 1-1, except that:

[0077] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:8;

[0078] The prepared waste oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore. The experimental results are shown in Tables 1-5.

[0079] The experimental results show that, using the method of preparing copper sulfide ore collector from waste engine oil provided by this invention, a small-scale closed-circuit laboratory test can obtain a copper concentrate with a copper grade of 26.13% and a copper recovery rate of 88.69%.

[0080] Table 1-5

[0081]

[0082] Examples 1-6

[0083] The other conditions are the same as in Example 1-1, except that:

[0084] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:10;

[0085] The prepared waste oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore. The experimental results are shown in Tables 1-6.

[0086] The experimental results show that, using the method of preparing copper sulfide ore collector from waste engine oil provided by this invention, a small-scale closed-circuit laboratory test can obtain a copper concentrate with a copper grade of 26.20% and a copper recovery rate of 88.24%.

[0087] Table 1-6

[0088]

[0089] Example 2-1

[0090] Using waste semi-synthetic automotive lubricating oil as raw material, and employing the method provided by this invention for preparing a waste engine oil collector and its application, the waste engine oil collector is first prepared as follows:

[0091] 1) Stir the collected waste oil at 150 rpm for 1 hour, then centrifuge at 15000 rpm for 0.5 hours, and collect the liquid after centrifugation.

[0092] 2) The liquid collected by centrifugation is mixed with water at a mass ratio of 1:1 and placed in a homogenizer for high-speed shearing at 12,000 rpm for 4 hours to obtain waste oil collector.

[0093] The prepared waste engine oil collector was applied to a small-scale closed-circuit flotation test of copper sulfide ore. The experimental raw material contained 0.38% copper and 2.12% sulfur. Mineralogical analysis showed that the main metallic minerals in the sample were pyrite and chalcopyrite, with a small amount of bornite. The specific experimental steps are as follows:

[0094] 1) Ball mill the copper sulfide ore to a fineness of -200 mesh, with 70% of the ore being copper sulfide.

[0095] 2) Add lime to adjust the pH of the slurry to 8.5, then add 100g / t of waste engine oil collector and 30g / t of MIBC in sequence for a roughing process;

[0096] 3) The rough concentrate after roughing is subjected to two blank cleaning processes, and the cleaned concentrate is copper concentrate.

[0097] 4) The coarse tailings after roughing are subjected to two scavenging processes. 50g / t of waste oil collector is added for scavenging 1, and 25g / t of waste oil collector is added for scavenging 2.

[0098] The experimental results are shown in Table 2-1.

[0099] The experimental results show that the method for preparing copper sulfide ore collectors using waste engine oil and its application, provided by this invention, is highly effective. A small-scale closed-circuit laboratory test yielded a copper concentrate with a copper grade of 22.42%, achieving a copper recovery rate of 88.13%.

[0100] Table 2-1

[0101]

[0102] Example 2-2

[0103] The other conditions are the same as in Example 2-1, except that:

[0104] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:1 and placed in a homogenizer for high-speed shearing at 10,000 rpm for 30 minutes to obtain the waste oil collector.

[0105] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0106] Add lime to adjust the pH of the slurry to 9.0, then add 200 g / t of waste engine oil collector and 30 g / t of MIBC in sequence for a roughing process;

[0107] The coarse tailings after roughing are subjected to two scavenging processes. In scavenging process 1, 100 g / t of waste oil collector is added, and in scavenging process 2, 50 g / t of waste oil collector is added.

[0108] The test results are shown in Table 2-2.

[0109] Table 2-2

[0110]

[0111] Example 2-3

[0112] The other conditions are the same as in Example 2-1, except that:

[0113] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:1 and placed in a homogenizer for high-speed shearing at 15,000 rpm for 120 minutes to obtain the waste oil collector.

[0114] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0115] Add lime to adjust the pH of the slurry to 9.0, then add 200g / t of waste engine oil collector and 20g / t of No. 2 oil in sequence for a roughing process;

[0116] The coarse tailings after roughing are subjected to two scavenging processes. In scavenging process 1, 100 g / t of waste oil collector is added, and in scavenging process 2, 50 g / t of waste oil collector is added.

[0117] The test results are shown in Table 2-3.

[0118] Table 2-3

[0119]

[0120] Example 3-1

[0121] Using waste fully synthetic automotive lubricating oil as raw material, and employing the method provided by this invention for preparing a waste engine oil collector and its application, the waste engine oil collector is first prepared as follows:

[0122] 1) Stir the collected waste oil at 300 rpm for 0.5 h, then centrifuge at 13000 rpm for 3 h, and collect the liquid after centrifugation.

[0123] 2) Mix the liquid collected by centrifugation with water at a mass ratio of 1:10, and place it in a homogenizer for high-speed shearing at 14,000 rpm for 1 hour to obtain waste oil collector.

[0124] The prepared waste engine oil collector was applied to a small-scale closed-circuit flotation test of copper sulfide ore. The copper content in the experimental raw material was 0.56%, and the sulfur content was 6.23%. Mineralogical analysis showed that the main metallic minerals in the sample were pyrite and chalcopyrite. The specific experimental steps are as follows:

[0125] 1) Ball mill the copper sulfide ore to a fineness of -200 mesh, with 75% of the ore being copper sulfide.

[0126] 2) Add lime to adjust the pH of the slurry to 9.5, then add 400g / t of waste engine oil collector and 25g / t of MIBC in sequence for a roughing process;

[0127] 3) The rough concentrate after roughing is subjected to two blank cleaning processes, and the cleaned concentrate is copper concentrate.

[0128] 4) The rough tailings after roughing are subjected to two scavenging processes. 200g / t of waste oil collector is added for scavenging 1 and 100g / t of waste oil collector is added for scavenging 2.

[0129] The experimental results are shown in Table 3-1.

[0130] The experimental results show that the method for preparing copper sulfide ore collectors using waste engine oil and its application, provided by this invention, is highly effective. A small-scale closed-circuit laboratory test yielded a copper concentrate with a copper grade of 23.26%, and a copper recovery rate of 89.54%.

[0131] Table 3-1

[0132]

[0133] Example 3-2

[0134] The other conditions are the same as in Example 3-1, except that:

[0135] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:10 and placed in a homogenizer for high-speed shearing at 14,000 rpm for 30 minutes to obtain the waste oil collector.

[0136] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0137] Add lime to adjust the pH of the slurry to 9.0, then add 400 g / t of waste engine oil collector and 25 g / t of MIBC in sequence for a roughing process;

[0138] The coarse tailings after roughing are subjected to two scavenging processes. In scavenging process 1, 200 g / t of waste oil collector is added, and in scavenging process 2, 100 g / t of waste oil collector is added.

[0139] The test results are shown in Table 3-2.

[0140] Table 3-2

[0141]

[0142] Example 3-3

[0143] The other conditions are the same as in Example 3-1, except that:

[0144] The liquid collected by centrifugation was mixed with water at a mass ratio of 1:10 and placed in a homogenizer for high-speed shearing at 14,000 rpm for 180 minutes to obtain the waste oil collector.

[0145] When the prepared waste engine oil collector was applied to a small-scale closed-circuit test for the flotation of copper sulfide ore,

[0146] Add lime to adjust the pH of the slurry to 9.0, then add 400 g / t of waste engine oil collector and 25 g / t of MIBC in sequence for a roughing process;

[0147] The coarse tailings after roughing are subjected to two scavenging processes. In scavenging process 1, 200 g / t of waste oil collector is added, and in scavenging process 2, 100 g / t of waste oil collector is added.

[0148] The experimental results are shown in Table 3-3.

[0149] Table 3-3

[0150]

[0151] Comparative Example 1

[0152] For the waste engine oil in Example 1-1, while maintaining other preparation steps, the centrifugal speed was reduced to 5000 rpm to prepare a waste engine oil collector. A small-scale closed-circuit laboratory test was then conducted on the mineral sample from Example 1 under the same process structure and reagent regime. The test results are shown in Table 4.

[0153] Table 4

[0154]

[0155] The experimental results show that the waste oil collector prepared by reducing the centrifugal speed can obtain a copper concentrate with a copper grade of 24.38% and a copper recovery rate of 86.19% in flotation tests. The comparison reveals that the copper recovery rate decreased by 3 percentage points, indicating that reducing the centrifugal speed led to incomplete impurity removal, affecting the flotation effect of the waste oil collector.

[0156] Comparative Example 2:

[0157] For the waste engine oil in Example 1-1, while maintaining other preparation steps, only the mass ratio of centrifuged liquid to water was changed to 2:1 to prepare a waste engine oil collector. A small-scale closed-circuit laboratory test was then conducted on the mineral sample from Example 1 under the same process structure and reagent regime. The test results are shown in Table 5.

[0158] The experimental results show that the waste oil collector prepared by reducing the rotation speed during homogenization can obtain a copper concentrate with a copper grade of 23.13% and a copper recovery rate of 86.78% in flotation tests. In comparison, the copper grade and recovery rate decreased by 2.5 percentage points, indicating that increasing the oil-to-water ratio leads to poor emulsification and a decline in flotation efficiency.

[0159] Table 5

[0160]

[0161] Comparative Example 3:

[0162] For the waste engine oil in Example 1-1, while keeping the preparation conditions unchanged, it was allowed to stand for 2 months before use, and a small-scale closed-circuit laboratory test was conducted on the mineral sample in Example 1 under the same process structure and reagent regime. The test results are shown in Table 6.

[0163] The test results show that prolonged settling time of waste oil collectors will lead to a significant decrease in copper recovery rate and copper grade.

[0164] Table 6

[0165]

Claims

1. A method of using waste engine oil for the preparation of copper sulphide ore collectors characterized in that, It comprises the following steps: (1) first, the copper sulfide ore is ground to a fineness of 50% to 80% of -200 mesh, adjust the pH of the slurry to 8 to 9.5, then add the waste engine oil collector, then add the frother, the concentrate obtained by once roughing is the copper rough concentrate, and the tailings are the copper roughing tailings; (2) the copper rough concentrate is subjected to 1-3 times of blank cleaning, and the cleaning concentrate is the copper concentrate; the copper roughing tailings are subjected to 1-3 times of scavenging, and the scavenging tailings are the tailings; The waste engine oil is prepared by the following steps: Step one, impurity removal of waste engine oil The collected waste engine oil is dispersed by stirring and then subjected to solid-liquid separation to obtain liquid A; Step two, homogenization and emulsification Liquid A obtained in step one is mixed with water, and homogenization and emulsification are carried out under high-speed shearing to obtain liquid B, which is the waste engine oil collector; in step two, the mass ratio of liquid A to water is 1:1-1:10; the high-speed shearing rate is 10000-15000 rpm.

2. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: In step one, the waste engine oil is one or more of mineral lubricating oil, semi-synthetic lubricating oil and fully synthetic lubricating oil in automobile engine waste lubricating oil.

3. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: In step one, the stirring rate is 100 rpm to 300 rpm, and the stirring time is 0.5 h to 2 h; the solid-liquid separation adopts centrifugal separation, the centrifugal speed is 12000 rpm to 15000 rpm, and the centrifugal time is 0.5 h to 4 h.

4. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: The copper sulfide ore is an ore containing one or more of chalcopyrite, chalcocite, bornite and covellite.

5. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: The roughing dosage of the waste engine oil collector is 50-500 g / t.

6. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 5, characterized by: The roughing dosage of the waste engine oil collector is 100-400 g / t.

7. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: The frother is one or more of No. 2 oil and MIBC, and the roughing dosage is 10-30 g / t.

8. The use of a method for preparing a copper sulphide ore collector using waste engine oil according to claim 1, characterized by: The dosage of the collector in scavenging is 0.1-0.5 times of the roughing dosage. The dosage of the collector in scavenging is 0.1-0.5 times of the roughing dosage.

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