Method for recovering valuable component copper in electronic waste copper material

Abstract

The invention provides a method for recovering valuable component copper in an electronic waste copper material, which comprises the following steps: mixing low-grade copper sulfide ore and electronic copper waste according to a mass ratio of 15: (1-30), crushing until the particle size is not greater than 15mm, adding water, and grinding to obtain ore pulp; performing magnetic separation on the ore pulp to obtain iron ore concentrate and magnetic separation tailings; a pH regulator is added into the magnetic separation tailings, the pH is regulated to 9-10.5, then a collecting agent and a foaming agent are added for roughing, and rough concentrate is obtained; a proper amount of collecting agent and foaming agent are added into the rough concentrate, and flotation copper concentrate is obtained after scavenging; and tailings left after scavenging are subjected to reselection treatment, and reselected copper concentrate is obtained after enrichment. The method provided by the invention is more systematized, easy to operate and low in recovery difficulty, copper in the electronic copper waste and the low-grade copper sulfide ore can be efficiently recovered, and resource waste is avoided.

Description

Technical Field

[0001] The present application relates to the field of mineral processing technology, and in particular to a method for recovering valuable component copper in electronic waste copper materials. Background Art

[0002] With the advancement of science and technology, in the process of rapid urbanization and industrialization, various natural mineral resources have been artificially mined, and after being processed, manufactured and used by humans in production and life, they have been accumulated in cities in the form of waste products and materials. They are called "urban minerals". These recyclable resources include metals, precious metals, plastics, rubber, etc.

[0003] As one of the major nonferrous metals, copper is widely used in wires and cables, electronic products, household appliances, construction and other fields. With the advancement of science and technology and economic development, the use of copper is increasing. At the same time, the amount of copper-containing secondary waste produced is also increasing.

[0005] With the continuous development of the electronic information industry, more and more electronic waste is generated each year, reaching 40 to 60 million tons, and increasing at a rate of 5 to 8% per year. Printed circuit boards are the core components of electronic products and the most economically valuable part of electronic waste materials. The copper content in them reaches more than 15%, which is much higher than the copper content in copper ore. However, the current methods for recovering copper from electronic waste materials are not systematic, and the recovery rate is not high, resulting in a large waste of copper resources. Summary of the invention

[0006] In order to solve the above problems, the present application provides a method for recovering the valuable component copper in electronic waste copper materials. After low-grade copper sulfide ore is mixed with electronic copper waste, the mixture is subjected to crushing, grinding, magnetic separation and flotation treatment in sequence to efficiently recover copper from the low-grade copper sulfide ore and electronic copper waste. The method is more systematic, can improve the recovery rate of copper metal, and avoid wasting resources.

[0007] The present application provides a method for recovering valuable component copper in electronic waste copper materials, the method comprising:

[0008] The low-grade copper sulfide ore and the electronic copper waste are mixed in a mass ratio of 15:(1-30), crushed to a particle size of no more than 15 mm, and then ground with water to obtain a slurry;

[0009] The slurry is subjected to magnetic separation at a magnetic field strength of 1000Oe to 2500Oe to obtain iron concentrate and magnetic separation tailings; a pH regulator is added to the magnetic separation tailings to adjust the pH to 9 to 10.5, and then a collector and a frother are added to perform rough separation to obtain a rough concentrate; an appropriate amount of a collector and a frother are added to the rough concentrate to perform scavenging to obtain a flotation copper concentrate;

[0010] The tailings remaining from the scavenging are subjected to gravity separation treatment to obtain gravity separated copper concentrate after enrichment.

[0011] Furthermore, the scanning includes:

[0012] Adding appropriate amount of collector and frother to the coarse concentrate to carry out first scavenging;

[0013] Add appropriate amount of collector and frother to the ore material obtained by the first scavenging and select, and carry out the second scavenging and select.

[0014] Furthermore, the first scanning time is 1min to 10min;

[0015] The second scanning time is 1 min to 10 min.

[0016] Further, the pH regulator is calcium oxide or calcium carbonate;

[0017] The collector includes ethylthiocarbamate, sulfur nitrogen and / or xanthate;

[0018] The foaming agent is terpineol.

[0019] Furthermore, the mass ratio of the low-grade copper sulfide ore to the electronic copper waste material is 15:(5-20).

[0020] Furthermore, the magnetic field strength during the magnetic separation is 1500Oe to 2000Oe.

[0021] Furthermore, the mass ratio of ore to water in the slurry is (20-45):(55-80).

[0022] Furthermore, the mass ratio of ore to water in the slurry is (30-40): (60-70).

[0023] Further, the copper content in the low-grade copper sulfide ore is > 0.1%;

[0024] The copper content in the electronic copper waste is ≥10%.

[0025] Furthermore, the low-grade copper sulfide ore includes native copper, chalcocite, tetrahedrite, chalcopyrite and / or azurite.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The present application provides a method for recovering valuable component copper in electronic waste copper materials. During recovery, low-grade copper sulfide ore is first mixed with electronic copper waste, and then crushed and ground with water. Since the particle size of the low-grade copper sulfide ore after crushing is large, it can act as a part of the grinding medium and participate in grinding the electronic copper waste, which helps to reduce the energy consumption during grinding; then the slurry is subjected to magnetic separation under a magnetic field strength of 1000Oe to 2500Oe to remove most of the iron concentrate, and then the pH is adjusted so that flotation is carried out in an alkaline environment. The alkaline environment can assist the collector and the frother, enhance the flotation effect, and obtain a flotation copper concentrate with better quality. The method provided by the present application is simple, easy to operate, and more systematic, and can be better applied to industrial-grade recovery;

[0028] 2. The method provided in the present application selects to mix the electronic copper waste and the low-grade copper sulfide ore and recover them together because the two can form a synergistic effect. On the one hand, the low-grade copper sulfide ore can assist in grinding the electronic copper waste to make its particles finer and more uniform. On the other hand, the copper in the electronic copper waste has a stronger adsorption force on the copper-containing ore in the low-grade copper sulfide ore, and can adsorb the copper resources well, which is convenient for subsequent recovery. The two can promote each other, so that the comprehensive recovery rate of copper is greatly improved, and a large amount of waste of copper resources in electronic copper waste and low-grade copper sulfide ore is avoided to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 A flow chart of a method for recovering valuable component copper in electronic waste copper materials proposed in an embodiment of the present application is shown;

[0031] Figure 2 A flow chart of another method for recovering valuable component copper in electronic waste copper materials proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the drawings, the size of the constituent elements, the thickness of the layer or the area may be exaggerated for the sake of clarity. Therefore, any implementation of the present disclosure is not necessarily limited to the size shown in the drawings, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the drawings schematically show ideal examples, and any implementation of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0034] In the related art, electronic waste, commonly known as "electronic garbage", refers to electrical or electronic equipment that is no longer used and the scrapped products generated during the production, maintenance, renovation and other processes of these equipment. With the rapid development of electronic technology and the rapid replacement of products, the amount of electronic waste is also increasing, becoming a global environmental problem. In order to solve the problem that a large amount of electronic waste generated by industry pollutes the environment, a large amount of copper resources contained cannot be well recycled, and the development value of low-grade copper sulfide minerals is low, resulting in waste of copper resources, the present application provides a method for recovering valuable component copper in electronic waste copper materials. The method is more systematic and convenient to operate, uses less reagents, generates less waste, has less pollution to the environment, and has a higher recovery rate of copper metal. It can be widely used in the recovery of valuable component copper in various industrial-grade electronic waste copper materials.

[0035] See also Figure 1 , Figure 1 The flowchart of a method for recovering valuable component copper in electronic waste copper materials proposed in an embodiment of the present application is shown, which specifically includes:

[0036] S1. Mix low-grade copper sulfide ore and electronic copper waste in a mass ratio of 15:(1-30), crush them to a particle size of no more than 15 mm, and then add water and grind them to obtain ore slurry;

[0037] S2, subjecting the ore pulp to magnetic separation at a magnetic field strength of 1000Oe to 2500Oe to obtain iron concentrate and magnetic tailings, adding a pH regulator to the magnetic tailings to adjust the pH to 9 to 10.5, and then adding a collector and a frother to perform rough separation to obtain a coarse concentrate, adding an appropriate amount of a collector and a frother to the coarse concentrate, and performing scavenging to obtain a flotation copper concentrate;

[0038] S3, performing gravity separation on the tailings remaining from the scavenging to obtain gravity-separated copper concentrate after enrichment.

[0039] In specific implementation, low-grade copper sulfide ore mainly contains copper sulfide minerals, such as bornite, chalcocite, etc. These minerals exist in euhedral crystals, inclusion crystals and impregnation structures, and the embedded particle sizes vary;

[0040] Electronic copper waste mainly refers to waste containing copper elements generated during the production, use, maintenance and disposal of electronic products. These wastes come from electronic components, circuit boards, wires and cables, electronic equipment, etc.

[0041] In a specific implementation, the crushed low-grade copper sulfide ore and electronic copper waste are added to a semi-autogenous mill for grinding.

[0042] The embodiment of the present application mixes low-grade copper sulfide ore with electronic copper waste and crushes it to a particle size of no more than 15mm, and then adds water to grind to obtain slurry. Since electronic copper waste is mostly electronic components such as circuit boards, after it is crushed together with the ore, the ore can replace a part of the grinding medium and participate in the grinding of electronic copper waste. Under the condition of ensuring that the monomer is fully dissociated, the particle size in the obtained slurry is made smaller and more uniform. When the flotation process is subsequently carried out, it is helpful to recover more copper-containing ore particles and improve the recovery rate. Not only that, the uniform and fine copper-containing ore obtained by grinding has a higher activity, and has stronger adsorption to chalcopyrite, bornite, etc. in low-grade copper sulfide ore, so that more copper-containing ores in low-grade copper sulfide ore can be adsorbed, and the recovery rate of copper in low-grade copper sulfide ore can be improved. In the roughing and scavenging stages, the uniform and fine copper-containing ore has an enhanced binding force with bubbles, and a joint floatation is achieved, which is more helpful to enhance the effect of roughing and scavenging treatment, and more copper-containing ores are recovered. Therefore, mixing low-grade copper sulfide ore with electronic copper waste can produce a synergistic effect, promote each other, enhance adsorption, and thus comprehensively improve the recovery rate of copper ore. Among them, when the crushed ore replaces part of the grinding medium, it can assist other grinding media and speed up the grinding rate, thereby reducing the energy consumption of the grinding equipment and also has certain environmental benefits.

[0043] In some embodiments, the copper content in the low-grade copper sulfide ore is > 0.1%;

[0044] The copper content in the electronic copper waste is ≥10%.

[0045] The copper content in low-grade copper sulfide ore is low, resulting in its low recycling value. In the existing process, low-grade copper sulfide ore is almost not recycled. However, the copper content in electronic copper waste is very high. After mixing it with low-grade copper sulfide ore, the valuable metal grade of low-grade copper sulfide ore is relatively improved, making it have a certain recycling value or development value, realizing the reuse of waste ore, providing a new way for the recycling or development of low-grade copper sulfide ore, and having certain social and economic value.

[0046] After grinding low-grade copper sulfide ore, the electronic copper waste will release a large amount of copper, which has a stronger adsorption performance for chalcopyrite, bornite and other materials in low-grade copper sulfide ore, and can adsorb the copper-containing ore in low-grade copper sulfide ore for recycling. Therefore, the two can form a certain interaction. On the one hand, the electronic copper waste can be ground more finely, which is more conducive to subsequent magnetic separation, flotation and other process treatments; on the other hand, it helps to better adsorb and recover the copper-containing ore in low-grade copper sulfide ore, obtain more copper metal that can be reused, and achieve better economic benefits.

[0047] In some embodiments, the low-grade copper sulfide ore includes native copper, chalcocite, tetrahedrite and / or azurite.

[0048] In specific implementation, native copper is a copper-containing ore whose main component is copper (Cu). In nature, native copper is relatively rare. Native copper is a product under reducing conditions in geological processes and is commonly found in primary hydrothermal deposits, the lower part of the oxidation zone of copper-containing sulfide deposits, and sandstone copper deposits.

[0049] Most of chalcocite is a secondary mineral formed by oxidation and decomposition of primary sulfides and then reduction. It is commonly found in hydrothermal copper deposits and is the main component of copper-rich, sulfur-poor ores.

[0050] Tetrahedrite is a sulfide mineral containing common elements such as copper, iron, zinc and silver. It is of low toxicity and is usually found in veins, coexisting with copper, silver, lead and zinc minerals. Tetrahedrite is found in varying amounts in some polymetallic deposits in China.

[0051] Chalcopyrite is a sulfide mineral, often containing trace amounts of gold, silver, etc. Chalcopyrite crystals are usually irregular granular and dense block aggregates.

[0052] In a specific implementation, low-grade copper sulfide ore and electronic copper scrap are mixed in a mass ratio of 15:(1-30). This is because the copper content in the low-grade copper sulfide ore is very low. If the mass of the low-grade copper sulfide ore is too much, the subsequent flotation separation cost will increase; if the mass of the low-grade copper sulfide ore is too little, there will be few particles that can replace the grinding medium after crushing, and the grinding effect on the electronic copper scrap is not ideal. The texture of the obtained particles is not uniform and fine enough. Limiting the low-grade copper sulfide ore and electronic copper scrap to a range of 15:(1-30) can produce better synergistic effects.

[0053] In a specific implementation, preferably, the mass ratio of the low-grade copper sulfide ore to the electronic copper waste material is 15:(5-20).

[0054] During the specific implementation, the slurry is subjected to magnetic separation under a magnetic field strength of 1000Oe to 2500Oe. The magnetization effect of the iron concentrate under this magnetic field is better, and almost all the iron concentrate can be separated. The intensity of the magnetic field is controlled because when the magnetic field intensity is too low, all ferromagnetic minerals cannot be fully magnetized, resulting in a decrease in the removal rate; and when the magnetic field intensity is too high, some non-ferromagnetic or weakly magnetic impurities will be captured together, thereby reducing the grade of the magnetically separated tailings. Therefore, it is more appropriate to control the magnetic field intensity of the magnetic separation at 1500Oe to 2000Oe, which can fully magnetize the ferromagnetic minerals and achieve a high removal rate, and can also avoid capturing some non-ferromagnetic or weakly magnetic impurities, while ensuring a high recovery rate and maintaining a good grade of the magnetically separated tailings.

[0055] In some embodiments, preferably, the magnetic field strength during the magnetic separation is 1500Oe to 2000Oe.

[0056] In some embodiments, a pH regulator is added to the magnetic tailings. Under alkaline conditions, the surface of the copper mineral changes from positively charged to negatively charged, which is conducive to interaction with positively charged collector ions, thereby improving the flotation effect. The alkaline environment is also conducive to the formation of a stable foam layer, so that the bubbles in the flotation process can more effectively combine with the mineral particles and float up, which helps to improve the flotation efficiency and reduce the impurity content in the concentrate. Improving the flotation efficiency helps to improve the quality of the flotation copper concentrate, thereby reducing energy consumption in the production process and reducing production costs.

[0057] In a specific implementation, the pH is adjusted to 9, 9.5, 10 or 10.5.

[0058] In some embodiments, during roughing, collectors and frothers are added to the magnetic tailings, slurry is mixed for 1 to 10 minutes, and after the agents are fully effective, roughing is performed for another 1 to 10 minutes to obtain a coarse concentrate and roughing tailings.

[0059] In specific implementation, the slurry is prepared for 2min to 6min, and after the reagent has fully acted, roughing is performed for 2min to 6min to obtain a rough concentrate and roughing tailings.

[0060] In specific implementation, the obtained rougher tailings enter the next magnetic separation and participate in subsequent processing steps to further screen the rougher tailings and recover the copper ore particles remaining in the rougher tailings to further enhance the recovery effect.

[0061] In some embodiments, the scanning includes:

[0062] Adding appropriate amount of collector and frother to the coarse concentrate to carry out first scavenging;

[0063] Add appropriate amount of collector and frother to the ore material obtained by the first scavenging and select, and carry out the second scavenging and select.

[0064] Since the embodiment of the present application mixes, crushes and grinds low-grade copper sulfide ore and electronic copper waste, the obtained ore particles have a smaller particle size, a higher content of fine particles and micro-fine particles, and a uniform texture. Therefore, the two-stage sweeping is particularly suitable for processing such fine and micro-fine materials, and can efficiently process and further remove impurities in the ore, especially fine-grained impurities, so that the quality of the obtained flotation copper concentrate is higher.

[0065] In specific implementation, after adding appropriate amount of collector and frother to the coarse concentrate, the slurry is adjusted for 1min to 10min, and the first sweep is carried out after the reagents have fully acted.

[0066] Preferably, the slurry is prepared for 3 to 6 minutes, and the first sweep is performed after the agent has fully acted.

[0067] After adding appropriate amount of collector and frother to the ore obtained from the first scavenging, the slurry is adjusted for 1min to 10min. After the reagents have fully acted, the second scavenging is carried out.

[0068] Preferably, the slurry is prepared for 3 to 6 minutes, and a second sweep is performed after the agent has fully acted.

[0069] In some embodiments, the first scanning time is 1 min to 10 min;

[0070] The second scanning time is 1 min to 10 min.

[0071] Preferably, the first scanning time is 3min to 6min;

[0072] The second scanning time is 3min to 6min.

[0073] In some embodiments, the pH adjuster is calcium oxide or calcium carbonate;

[0074] The collector includes ethylthiocarbamate, sulfur nitrogen and / or xanthate;

[0075] The foaming agent is terpineol.

[0076] Calcium oxide is highly alkaline and can quickly neutralize acidic substances in the pulp, allowing the pH value of the pulp to quickly reach the required range. This high efficiency helps save time and resources and improve the efficiency of the flotation process;

[0077] Calcium carbonate exhibits relatively mild characteristics when adjusting the pH value of the slurry. It can gradually dissolve and release alkaline substances, thereby avoiding drastic pH fluctuations in the slurry and facilitating the stable progress of the mineral processing process.

[0078] Preferably, the pH regulator is calcium oxide. Using calcium oxide to adjust the pH of the pulp to 9-10.5 helps to improve the adsorption effect of bubbles and mineral particles, thereby improving the flotation efficiency and the quality of the flotation copper concentrate; calcium oxide can also activate the collector, further improving the flotation effect.

[0079] Ethylthiocarbamate, also known as Z200, is a flotation agent that changes the hydrophobicity of the mineral surface and makes the floating mineral particles adhere to the bubbles.

[0080] Sulfur-nitrogen collectors mainly include ethylthiocyanate, thiocyanate (such as thiocyanate), ethyl nitrogen, butylthiocyanate, etc. Sulfur-nitrogen collectors can form coordination bonds with metal ions on the surface of minerals through sulfur atoms, especially with copper metal ions on the surface of sulfide minerals to form relatively stable thiolates, thereby enhancing the hydrophobicity of minerals.

[0081] Xanthate collectors can dissociate more anions ROCSS in an alkaline environment - These anions combine with cations on the surface of copper minerals to form a hydrophobic film, which promotes the flotation of minerals.

[0082] Preferably, the collector is ethylthiocarbamate, which has a better effect on the flotation of copper ore and produces relatively less pollution during the mineral processing process.

[0083] In some embodiments, the mass ratio of ore to water in the slurry is (20-45):(55-80).

[0084] In specific implementation, when the pulp concentration is low, the recovery rate is also low; as the pulp concentration gradually increases, the recovery rate gradually increases and reaches a maximum value. When the pulp concentration exceeds the optimal value, the recovery rate will decrease. Because the pulp concentration needs to be controlled between 20% and 45% to achieve the highest recovery rate.

[0085] In a specific implementation, preferably, the mass ratio of ore to water in the slurry is (30-40): (60-70).

[0086] In practice, gravity separation is also called gravity separation, which is a method of separation using the difference in density of mineral particles.

[0087] In some embodiments, the gravity separation process uses one or a combination of a shaking table and a spiral chute.

[0088] A shaking table is a device that uses mechanical vibration and water flushing to loosen and stratify the mineral particles on the bed surface, and move them longitudinally and transversely along the bed surface, thereby achieving sorting.

[0089] The spiral chute is a device that uses centrifugal force, gravity and friction to separate minerals. After the slurry is fed from the top of the spiral chute, it will produce different movement trajectories and speeds during the process of rotating and flowing in the spiral chute due to the differences in density, particle size and shape of the mineral particles, thus achieving separation.

[0090] The above two types of gravity separation equipment are more suitable for fine and ultra-fine minerals. They can further separate the tailings left over from flotation, recover the fine copper ore with high dispersion, obtain gravity-separated copper concentrate, and improve the comprehensive recovery rate of copper ore.

[0091] In order to enable those skilled in the art to understand the present application more clearly, a method for recovering valuable component copper in electronic waste copper materials described in the present application is now described in detail through the following examples.

[0092] The following examples are all referenced Figure 2 The recovery operation flow chart of the valuable component copper in the electronic waste copper material is shown, specifically:

[0093] Example 1

[0094] Crushing and grinding: Mix single chalcopyrite with a copper grade of 0.12% and waste electronic-grade printed circuit boards with a copper content of 14.6% in a mass ratio of 10:1 to prepare a sample, and then crush and mix the sample to obtain solid particles with a particle size of no more than 15 mm;

[0095] Slurry preparation: Add solid particles into the semi-autogenous mill and add water for grinding. After grinding, particles with a size of no more than 0.074 mm account for 60% of the total particles. Then, mechanical stirring is performed to prepare the slurry to obtain a slurry with a concentration of 30%;

[0096] Magnetic separation: The slurry obtained by slurry adjustment is subjected to magnetic separation, and the magnetic field strength is set to 1800Oe. After magnetic separation, iron concentrate and magnetic tailings are obtained;

[0097] Flotation: After slurrying the magnetic tailings, a slurry with a concentration of 33% is obtained, and then calcium oxide is added to adjust the pH of the slurry to 9.5 to make the slurry alkaline, and then 40g / t of collector Z200 and 20g / t of frother pine alcohol are added, and roughing is carried out after slurrying for 5 minutes, and roughing is carried out for 5 minutes to obtain a rough concentrate; 20g / t of collector Z200 and 10g / t of frother pine alcohol are added to the rough concentrate, and the first scavenging is carried out after slurrying for 5 minutes, and scavenging is carried out for 5 minutes to obtain scavenging concentrate 1, and then 20g / t of collector Z200 and 10g / t of frother pine alcohol are added, and the slurrying is carried out for 5 minutes. The second scavenging is carried out for 5 minutes to obtain scavenging concentrate 2; after two scavengings of the rough concentrate, a flotation copper concentrate is obtained, wherein the copper grade of the flotation copper concentrate is 20.32%, and the copper recovery rate is 87.45%;

[0098] Gravity separation: The remaining tailings from flotation are sent to a shaking table for gravity separation. After separation and enrichment, gravity separation copper concentrate and tailings are obtained. The copper grade is 18.11%, the copper recovery rate is 3.11%, and the total copper recovery rate is 90.56%.

[0099] According to Example 1, after mixing low-grade chalcopyrite with electronic copper waste, crushing and grinding, and then sequentially undergoing magnetic separation, roughing and scavenging treatment, the grade of the recovered flotation copper concentrate is further improved, and the recovery rate of copper in the flotation stage reaches more than 85%, proving that the recovery method provided in the embodiment of the present application can efficiently recover copper ore, especially electronic copper waste. When the tailings remaining from flotation are subsequently re-selected, the copper grade of the re-selected copper concentrate is also very high, and the total recovery rate of copper is increased to 90.56%, which greatly avoids waste of resources.

[0100] Example 2

[0101] Crushing and grinding: copper sulfide ore (containing chalcopyrite, bornite and tetrahedrite) with a copper grade of 0.53% and waste electronic-grade printed circuit boards containing 16.8% copper are mixed in a mass ratio of 5:1 to prepare a sample, and then the sample is crushed and mixed to obtain solid particles with a particle size of no more than 15 mm;

[0102] Slurry preparation: Add solid particles into the semi-autogenous mill, then add water for grinding. After grinding, particles with a size of no more than 0.074 mm account for 65% of the total particles. Then, mechanical stirring is performed to prepare the slurry to obtain a slurry with a concentration of 30%;

[0103] Magnetic separation: The slurry obtained by slurry adjustment is subjected to magnetic separation, and the magnetic field strength is set to 3000Oe. After magnetic separation, iron concentrate and magnetic tailings are obtained;

[0104] Flotation: After slurrying the magnetic tailings, a slurry with a concentration of 33% was obtained, and then calcium oxide was added to adjust the pH of the slurry to 10.5, and then 60g / t of collector Z200 and 25g / t of frother pine alcohol were added. After slurrying for 5 minutes, roughing was carried out to obtain a rough concentrate after 5 minutes of roughing; 30g / t of collector Z200 and 15g / t of frother pine alcohol were added to the rough concentrate, and after slurrying for 5 minutes, the first scavenging was carried out to obtain scavenged concentrate 1 after scavenging for 5 minutes, and then 20g / t of collector Z200 and 10g / t of frother pine alcohol were added, and after slurrying for 5 minutes, the second scavenging was carried out to obtain scavenged concentrate 2 after scavenging for 5 minutes; the rough concentrate was scavenged twice to obtain a flotation copper concentrate, and the copper grade of the flotation copper concentrate was 31.42%, and the copper recovery rate was 86.78%;

[0105] Gravity separation: The tailings remaining from flotation are sent to a shaking table for gravity separation. After separation and enrichment, a gravity-separated copper concentrate is obtained with a copper grade of 21.67%, a copper recovery rate of 5.41%, and a total copper recovery rate of 92.19%.

[0106] The difference between Example 2 and Example 1 is that the low-grade copper sulfide ore selected in Example 2 is different, and the copper content in the electronic copper waste is different. After flotation in Example 2, the flotation copper concentrate obtained has a higher grade and a higher recovery rate, which proves that the recovery method provided in the embodiment of the present application can achieve a good recovery effect for different types of low-grade copper sulfide ores and electronic copper waste with different copper contents, and in the tailings remaining from flotation, the copper grade of the re-selected copper concentrate is 21.67%, the copper recovery rate is 5.41%, and the total recovery rate of copper is increased to 92.19%, achieving efficient recovery.

[0107] In summary, the method for recovering valuable component copper in electronic waste copper materials provided in this application has the following advantages:

[0108] 1. The recycling method has fewer steps, a complete system, and is easy to operate. It reduces the difficulty of recovering the valuable component copper in electronic waste copper materials, and provides powerful guidance for the recovery of electronic copper waste and the development and utilization of low-grade copper sulfide ores;

[0109] 2. This method mixes low-grade copper sulfide ore and electronic copper waste, crushes and grinds them together, grinds the electronic copper waste with the granular low-grade copper sulfide ore, and makes the obtained ore particles smaller in size, more uniform in texture and finer in texture, and then sequentially performs magnetic separation, roughing separation, scavenging separation and gravity separation on the slurry to obtain flotation copper concentrate and gravity separation copper concentrate, respectively, and the comprehensive recovery rate of copper is above 90%, which greatly promotes the recovery of copper metal and avoids the waste of copper resources in a large amount of low-grade copper sulfide ore and electronic copper waste;

[0110] 3. In the recovery method provided in the present application, low-grade copper sulfide ore and electronic copper waste are selected for mixing because the copper content in the low-grade copper sulfide ore is extremely low and has almost no value for development and utilization. Mixing the low-grade copper sulfide ore and electronic copper waste can improve the valuable metal grade of the low-grade copper sulfide ore, improve its utilization value, and achieve better economic benefits;

[0111] 4. In the recovery method provided in the present application, low-grade copper sulfide ore and electronic copper waste are selected for mixing. This is also because in the process of copper recovery, copper has a high activity and has a strong adsorption capacity for chalcopyrite, bornite, etc. in low-grade copper sulfide ore. The combination of the two is more conducive to the recovery of copper ore with a lower content in low-grade copper sulfide ore, providing a new way to recover copper in low-grade copper sulfide ore.

[0112] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0113] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0114] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0115] The above is a detailed introduction to a method for recovering valuable component copper in electronic waste copper materials provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for recovering valuable component copper in electronic waste copper materials, characterized in that: The method comprises: S1. Mix low-grade copper sulfide ore and electronic copper waste in a mass ratio of 15:(1-30), crush them to a particle size of no more than 15 mm, and then add water and grind them to obtain ore slurry; S2, subjecting the ore pulp to magnetic separation at a magnetic field strength of 1000Oe to 2500Oe to obtain iron concentrate and magnetic tailings, adding a pH regulator to the magnetic tailings to adjust the pH to 9 to 10.5, and then adding a collector and a frother to perform rough separation to obtain a coarse concentrate, adding an appropriate amount of a collector and a frother to the coarse concentrate, and performing scavenging to obtain a flotation copper concentrate; S3, performing gravity separation on the tailings remaining from the scavenging to obtain gravity-separated copper concentrate after enrichment.

2. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The scanning includes: Adding appropriate amount of collector and frother to the coarse concentrate to carry out first scavenging; Add appropriate amount of collector and frother to the ore material obtained by the first scavenging and select, and carry out the second scavenging and select.

3. The method for recovering valuable component copper in electronic waste copper materials according to claim 2, characterized in that: The first scanning time is 1min to 10min; The second scanning time is 1 min to 10 min.

4. The method for recovering valuable component copper in electronic waste copper materials according to claim 1 or 2, characterized in that: The pH regulator is calcium oxide or calcium carbonate; The collector includes ethylthiocarbamate, sulfur nitrogen and / or xanthate; The foaming agent is terpineol.

5. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The mass ratio of the low-grade copper sulfide ore to the electronic copper waste material is 15:(5-20).

6. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The magnetic field intensity during the magnetic separation is 1500Oe-2000Oe.

7. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The mass ratio of ore to water in the slurry is (20-45):(55-80).

8. The method for recovering valuable component copper in electronic waste copper materials according to claim 7, characterized in that: The mass ratio of ore to water in the slurry is (30-40):(60-70).

9. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The copper content in the low-grade copper sulfide ore is > 0.1%; The copper content in the electronic copper waste is ≥10%.

10. The method for recovering valuable component copper in electronic waste copper materials according to claim 1, characterized in that: The low-grade copper sulfide ore includes native copper, chalcocite, tetrahedrite, chalcopyrite and / or azurite.

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