Ammonia-process dump leaching method for copper oxide ore

Abstract

According to the ammonia-process dump leaching method for the copper oxide ore, ore is subjected to alkalization treatment in advance, so that metal ions such as calcium and magnesium are directly deposited in an ore heap, generation of precipitates in leachate is reduced, and the precipitates are prevented from blocking a pipeline. Ammonium salt and alkali slowly act in the ore heap, free ammonia molecules are released, continuous leaching of copper can be guaranteed, and ammonia volatilization loss is controlled. The surface of the ore heap is sealed, the ore heap with the ore particle size smaller than 10 mm is directly covered with a film, and the ore heap with the ore particle size larger than 10 mm is covered with river sand or river pebbles and then covered with a sealing film. A dripping liquid container, an intermediate liquid container, a qualified liquid container and a mixing and clarifying tank of an extraction device are arranged to be in a sealed state, raffinate returns to the dripping liquid container, and ammonia is recycled. By means of the method, economical and efficient development and utilization of the low-grade copper oxide ore can be achieved.

Description

Technical Field

[0001] This invention relates to the field of copper oxide leaching technology, specifically to an ammonia heap leaching method for copper oxide ore. Background Technology

[0002] The industrial practice of leaching copper oxide with ammonia has a history of over 100 years. The first ammonia leaching copper project began in 1915, using a stirred leaching process to treat copper carbonate and native copper. In the early days, the ammonia stirred process was used to treat oxide ores and secondary sulfide ores, and ammonia was recovered by ammonia stripping. However, due to the difficulty and high cost of ammonia recovery, the difficulty in disposing of sulfates, and the difficulty in purifying qualified solutions, these ammonia leaching copper plants were closed one after another.

[0003] CN1718786A discloses a room-temperature stirred ammonia leaching-leaching residue flotation method for copper oxide ore. The leaching solution is recycled without ammonia vaporization after extraction. This method can achieve efficient leaching of copper oxide ore, but the solid-liquid separation operation after stirred leaching inevitably leads to water expansion, thus the problem of high ammonia consumption remains unresolved. CN102703701A discloses a method for treating copper oxide ore using a combined stirred ammonia leaching and percolation ammonia leaching process. This method uses a fully closed process to reduce ammonia volatilization loss, but the stirred leaching process still cannot solve the ammonia loss problem caused by water expansion. To improve the ammonia leaching efficiency of copper oxide ore, CN113088690A discloses a stirred ammonia leaching method for copper oxide ore with added EDTA, but no measures to reduce ammonia consumption are found. CN102703700A proposes a segmented ammonia leaching and diversion extraction method for copper oxide ore, which reduces ammonia consumption, but still cannot solve the ammonia loss problem caused by water expansion.

[0004] Existing ambient temperature and pressure ammonia leaching processes are mainly limited to stirred ammonia leaching of copper oxide ores. Stirred leaching requires grinding, makes solid-liquid separation difficult, consumes ammonia in large quantities, requires sophisticated equipment, consumes a lot of electricity, and has high production costs, making it unsuitable for low-grade ores.

[0005] Developing ammonia leaching and heap leaching technology for oxidized copper ores can reduce production costs and improve the utilization rate of low-grade copper ores. However, heap leaching is an open system, and under normal temperature and pressure conditions, ammonia volatilization is high, resulting in high ammonia consumption. Reducing ammonia volatilization during heap leaching is crucial for successful ammonia leaching. Due to the acidification process during the formation of oxidized copper ores, the pH value of the ammonium salt solution decreases during ammonia leaching. Calcium and magnesium ions in the gangue dissolve, and these dissolved calcium and magnesium ions undergo secondary precipitation upon encountering the high-pH ammonium salt solution, clogging the pipelines and the surface of the ore heap, thus affecting ammonia leaching. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention aims to provide a method for ammonia heap leaching of copper oxide ore.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] As one aspect of the present invention, a method for ammonia heap leaching of copper oxide ore includes the following steps:

[0009] S1. Mix copper oxide ore with alkali and pile it up. After the pile is completed, install drip irrigation pipes on the surface of the pile.

[0010] S2. If the particle size of the copper oxide ore is less than 10mm, directly cover the surface of the ore pile with a sealing film. If the particle size of the copper oxide ore is greater than 10mm, first cover the surface of the ore pile with river sand or river pebbles, and then cover the surface of the river sand or river pebbles with a sealing film.

[0011] S3. Ammonia solution is pre-prepared as the leaching solution and stored in the leaching solution container. The leaching solution is connected to the leaching pipe and the leaching solution container by a pump. The leaching solution is pumped to the surface of the ore pile and dripped onto the surface of the ore pile through the leaching pipe to achieve copper leaching by distributing the solution to the ore pile. The copper-containing leaching solution obtained by copper leaching flows out from the bottom of the ore pile. When the copper concentration of the copper-containing leaching solution meets the preset qualified solution standard, it enters the qualified solution container; otherwise, it enters the intermediate solution container. The copper-containing leaching solution in the qualified solution container is sent to the extraction device. The raffinate after extraction is returned to the leaching solution container, and the ammonia in the raffinate is recycled.

[0012] As another aspect of the present invention, a method for ammonia heap leaching of copper oxide ore includes the following steps:

[0013] S1. Mix copper oxide ore with alkali and ammonium salt and pile it up. After the pile is completed, install drip irrigation pipes on the surface of the pile.

[0014] S2. If the particle size of the copper oxide ore is less than 10mm, directly cover the surface of the ore pile with a sealing film. If the particle size of the copper oxide ore is greater than 10mm, first cover the surface of the ore pile with river sand or river pebbles, and then cover the surface of the river sand or river pebbles with a sealing film.

[0015] S3. Clean water is stored as the dripping liquid in a dripping liquid container, and a pump connects the dripping pipe and the dripping liquid container. The dripping liquid is pumped to the surface of the ore pile and dripped onto the surface of the ore pile through the dripping pipe, causing the ammonium salt to dissolve and realizing the copper leaching of the ore pile. The copper-containing leaching solution obtained from copper leaching flows out from the bottom of the ore pile. When the copper concentration of the copper-containing leaching solution meets the preset qualified solution standard, it enters the qualified solution container; otherwise, it enters the intermediate solution container. The copper-containing leaching solution in the qualified solution container is sent to the extraction device. The raffinate after extraction is returned to the dripping liquid container, and the ammonia in the raffinate is recycled.

[0016] Furthermore, in both of the above schemes, the drip liquid container, intermediate liquid container, qualified liquid container, and the mixing and clarification tank of the extraction device are all in a sealed state.

[0017] Furthermore, in the two schemes mentioned above, the copper oxide ore includes any one of single copper oxide ore, cobalt-containing copper oxide ore, nickel-containing copper oxide ore, zinc-containing copper oxide ore and oxygen-sulfur mixed copper ore, and its Cu mass content is 0.1-10%.

[0018] Furthermore, in the two schemes mentioned above, in step S1, the mined raw copper oxide ore is directly piled up, and alkali and / or ammonium salts are added to mix with the copper oxide ore during the pile-building process; or, the raw copper oxide ore is first crushed, and then the crushed copper oxide ore is piled up, and alkali and / or ammonium salts are added to mix with the copper oxide ore during the crushing and / or pile-building process, and the particle size of the crushed copper oxide ore is P80 = 5mm-300mm.

[0019] Furthermore, in the above two schemes, in step S1, the alkali is one or more of lime, sodium hydroxide, sodium carbonate and ammonium carbonate. Based on the dry weight of each ton of original copper oxide ore, 1-100 kg of lime is mixed into each ton of original copper oxide ore, or 0.5-20 kg of sodium hydroxide, sodium carbonate or ammonium carbonate is mixed into each ton of original copper oxide ore.

[0020] Furthermore, in the two schemes mentioned above, in step S2, the sealing film is an HDPE film with a thickness of 1-3mm or a PE film with a thickness of 0.1-0.5mm and 2-5 layers; the particle size of the river sand or river pebbles covering the surface of the ore pile is 0.5-50mm.

[0021] Furthermore, in the first scheme, in step S3, the ammonia solution is prepared using one or more of ammonium sulfate, ammonium chloride, ammonium fluoride, ammonium nitrate, ammonium carbonate, ammonium bicarbonate, and ammonia water, and the total ammonia concentration of the ammonia solution is 0.5-5 mol / L.

[0022] Furthermore, in the second scheme, the ammonium salt includes one or more of ammonium sulfate, ammonium chloride, ammonium fluoride, ammonium nitrate, ammonium carbonate, and ammonium bicarbonate.

[0023] Further, in step S3, when the pH of the copper-containing leaching solution is >10.0, ammonium sulfate or ammonium chloride is added to the dripping solution; when the pH of the copper-containing leaching solution is <7.5, one or a combination of lime, sodium hydroxide, sodium carbonate, ammonium bicarbonate, or ammonium carbonate is added to the dripping solution to control the pH of the copper-containing leaching solution between 7.5 and 10.0; the dripping rate of the dripping solution is 6-100 L / m³. 2 ·h.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. This invention pre-treats the ore with alkali, allowing calcium and magnesium ions to directly deposit inside the ore heap. This reduces the formation of precipitates in the leachate and prevents precipitates from clogging the pipelines. In the ore heap, ammonium salts react slowly with the alkali, releasing free ammonia molecules, ensuring continuous copper leaching and controlling ammonia volatilization loss.

[0026] 2. Sealing the surface of the ore pile can inhibit ammonia volatilization and prevent natural rainfall from entering the leaching system, thus avoiding ammonia loss due to water expansion.

[0027] 3. For ore piles with a particle size of less than 10mm, cover them directly with a film. For ore piles with a particle size of more than 10mm, cover them first with river sand or river pebbles and then cover them with a sealing film. This can protect the sealing film from being damaged.

[0028] 4. By setting the drip liquid container, intermediate liquid container, qualified liquid container and the mixing and clarification tank of the extraction device to a sealed state, and allowing the raffinate to return to the drip liquid container, ammonia can be recycled, which can effectively reduce ammonia loss and improve ammonia utilization rate.

[0029] 5. By adopting a high-intensity liquid distribution speed, the leaching rate can be increased and the leaching cycle can be shortened.

[0030] In summary, the method of the present invention can realize the economical and efficient development and utilization of low-grade oxidized copper ore. Attached Figure Description

[0031] Figure 1 This is a schematic diagram illustrating the implementation principle of the method of the present invention. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0033] Example 1

[0034] This embodiment provides a method for ammonia heap leaching of copper oxide ore, such as... Figure 1 As shown. The processed ore was a cobalt-containing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals were mainly quartz, chlorite, and dolomite. The main chemical composition of the ore was: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yielded a particle size of P... 80 For a sample with a diameter of 10 mm, 1 kg / t of lime was mixed in during the crushing process.

[0035] A column leaching system was used to simulate heap leaching, and a collection tank was used to simulate a qualified liquid container. After the above-mentioned ore was piled into the leaching column, the leaching column was sealed with a 1 mm thick HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device were both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution was a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 7.5 and a total ammonia concentration of 2 mol / L.

[0036] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 7.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 33.3%, the ammonia consumption was 0.3 kg / t, and the calcium content of the leachate was... 2+ 702ppm, Mg 2+ 411 ppm, no precipitate formed.

[0037] Example 2

[0038] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being treated is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For a sample with a diameter of 10 mm, 10 kg / t of lime was mixed in during the crushing process.

[0039] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 3mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 2 mol / L.

[0040] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 70.5%, the ammonia consumption was 0.6 kg / t, and the calcium content of the leachate was... 2+472ppm, Mg 2+ 5.4 ppm, no precipitate formed.

[0041] Example 3

[0042] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For a sample with a diameter of 10 mm, 100 kg / t of lime was mixed in during the crushing process.

[0043] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 2mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, and sodium hydroxide is added to adjust the pH to 10 to obtain the drip solution with a total ammonia concentration of 2 mol / L.

[0044] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 10 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 95%, the ammonia consumption was 1.35 kg / t, and the calcium content of the leachate was... 2+ 165ppm, Mg 2+ 4.5 ppm, no precipitation formed.

[0045] Example 4

[0046] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 10 mm, 15 kg / t of lime and 3 kg / t of ammonium sulfate were mixed in during the crushing process.

[0047] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 2mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The initial drip solution is clean water, and the dripping rate is 24L / m. 2 •h, dissolve ammonium sulfate in water.

[0048] The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 40%, ammonia consumption was 0.45 kg / t, and the calcium content of the leachate was [not specified]. 2+ 421ppm, Mg 2+ 7.1 ppm, no precipitate formed.

[0049] Example 5

[0050] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, which includes malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For a sample with a diameter of 10 mm, 10 kg / t of lime was mixed in during the crushing process.

[0051] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 1 mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 5 mol / L.

[0052] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 91%, the ammonia consumption was 1.5 kg / t, and the calcium content of the leachate was [missing information]. 2+ 451ppm, Mg 2+ 9.2 ppm, no precipitate formed.

[0053] Example 6

[0054] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For a sample with a diameter of 10 mm, 10 kg / t of lime was mixed in during the crushing process.

[0055] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 3mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is an ammonium bicarbonate solution, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 2 mol / L.

[0056] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 76%, the ammonia consumption was 0.7 kg / t, and the calcium content of the leachate was... 2+ 430ppm, Mg 2+ 6.5 ppm, no precipitation formed.

[0057] Example 7

[0058] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 5 mm, 10 kg / t of lime was mixed in during the crushing process.

[0059] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a 1 mm thick HDPE membrane is used to seal the leaching column. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 2 mol / L.

[0060] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 6 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the copper, ammonia, calcium, and magnesium ion concentrations in the leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 65%, ammonia consumption was 0.5 kg / t, and the calcium content of the leachate was... 2+ 479ppm, Mg 2+ 22.3 ppm, no precipitate formed.

[0061] Example 8

[0062] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a cobalt-bearing copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yields a particle size of P... 80 For a sample of 300mm, 10kg / t of lime was mixed in during the crushing process.

[0063] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, a layer of river sand and pebbles with a particle size of 0.5-50 mm is first covered on the surface of the ore. The leaching column is sealed with a 1 mm thick HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 2 mol / L.

[0064] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 100 L / m. 2• h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 78%, the ammonia consumption was 0.61 kg / t, and the calcium content of the leachate was... 2+ 256ppm, Mg 2+ 2.5 ppm, no precipitation formed.

[0065] Example 9

[0066] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a nickel-bearing copper oxide ore sample, including malachite, cuprite, and azurite; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 10.1%, Ni 2%, Fe 3.2%, CaO 18.9%, MgO 13.6%, TC 10.3%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 10 mm, 0.5 kg / t of sodium carbonate is added after crushing.

[0067] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the leaching column is sealed with a PE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is an ammonium bicarbonate solution, stored in a sealed drip solution container, with a pH of 7.5 and a total ammonia concentration of 2 mol / L.

[0068] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 7.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 36%, the ammonia consumption was 0.31 kg / t, and the calcium content of the leachate was... 2+ 402ppm, Mg 2+ 296 ppm, no precipitate formed.

[0069] Example 10

[0070] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being treated is a nickel-bearing copper oxide ore sample, including malachite, cuprite, and azurite; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 10.1%, Ni 2%, Fe 3.2%, CaO 18.9%, MgO 13.6%, TC 10.3%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 10 mm, after crushing, 20 kg / t of sodium carbonate is added.

[0071] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the leaching column is sealed with a PE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 9.5 and a total ammonia concentration of 2 mol / L.

[0072] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 9.5 during the leaching process. Samples were taken and analyzed to determine the copper, ammonia, calcium, and magnesium ion concentrations in the leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 94%, ammonia consumption was 0.89 kg / t, and the calcium content of the leachate was... 2+ 121ppm, Mg 2+ 3.1 ppm, no precipitate formed.

[0073] Example 11

[0074] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being treated is a zinc-bearing copper oxide ore sample, including malachite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 2.6%, Zn 1.8%, Fe 2.7%, CaO 11.1%, MgO 8.6%, TC 8.3%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 10 mm, after crushing, 0.5 kg / t of sodium hydroxide is added.

[0075] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the leaching column is sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.0 and a total ammonia concentration of 2 mol / L.

[0076] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.0 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 66%, the ammonia consumption was 0.35 kg / t, and the calcium content of the leachate was... 2+ 369ppm, Mg 2+ 4.5 ppm, no precipitation formed.

[0077] Example 12

[0078] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being treated is a zinc-bearing copper oxide ore sample, including malachite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 2.6%, Zn 1.8%, Fe 2.7%, CaO 11.1%, MgO 8.6%, TC 8.3%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 10 mm, after crushing, 20 kg / t of sodium hydroxide is added.

[0079] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the leaching column is sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixed solution of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 10 and a total ammonia concentration of 2 mol / L.

[0080] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 10 during the leaching process. Samples were taken and analyzed to determine the copper, ammonia, calcium, and magnesium ion concentrations in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 96%, ammonia consumption was 1.3 kg / t, and the calcium content of the leachate was [not specified]. 2+ 110ppm, Mg 2+ 1.5 ppm, no precipitation formed.

[0081] Example 13

[0082] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a pure copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.5%, Fe 1.7%, CaO 9.1%, MgO 7.5%, TC 7.7%. After crushing, the copper oxide ore yields a particle size of P... 80 For samples with a diameter of 20 mm, after crushing, 2.4 kg / t of ammonium carbonate was added.

[0083] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, 0.5-10mm of river sand and river pebbles are first covered on the surface of the ore. The leaching column is sealed with an HDPE membrane, and the collection tank and the mixing and clarification tank of the extraction device are all covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance.

[0084] Initially, a water spray leaching column was used with a drip rate of 24 L / m. 2 At 1 hour, ammonium carbonate begins to dissolve, and the total ammonia concentration is 0.5 mol / L. The pH of the copper-containing leachate is controlled at 8.5 during the leaching process. Samples are taken for analysis of the copper, ammonia, calcium, and magnesium ion concentrations in the copper-containing leachate. The copper-containing leachate is then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate is returned to the leaching process, and ammonia is recycled. After 30 days of testing, the copper leaching rate is 80%, the ammonia consumption is 0.4 kg / t, and the calcium content of the leachate is... 2+ 216ppm, Mg 2+ 3.4 ppm, no precipitation formed.

[0085] Example 14

[0086] This embodiment provides an ammonia heap leaching method for copper oxide ore. The ore being processed is a pure copper oxide ore sample, including malachite, cuprite, azurite, and chrysocolla; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 0.5%, Fe 1.7%, CaO 9.1%, MgO 7.5%, TC 7.7%. After crushing, the copper oxide ore yields a particle size of P... 80 A sample with a diameter of 20 mm was crushed and then mixed with 9.6 kg / t of ammonium carbonate.

[0087] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the ore surface is first covered with 0.5-10mm of river sand and pebbles. The leaching column is sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device are also covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. Initially, the leaching column is sprayed with clean water at a drip rate of 24L / m. 2At h, ammonium carbonate begins to dissolve, and the total ammonia concentration is 2 mol / L. The pH of the copper-containing leachate is controlled at 9.2 during the leaching process. Samples are taken for analysis of the copper, ammonia, calcium, and magnesium ion concentrations in the copper-containing leachate. The copper-containing leachate is then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate is returned to the leaching process, and ammonia is recycled. After 30 days of testing, the copper leaching rate is 91%, ammonia consumption is 1.1 kg / t, and the calcium content of the leachate is [not specified]. 2+ 89ppm, Mg 2+ 1.2 ppm, no precipitate formed.

[0088] Example 15

[0089] The ore sample is an oxygen-sulfur mixed copper ore, with the main copper minerals including malachite, cuprite, azurite, chalcopyrite, chalcocite, covellite, and chalcopyrite; the gangue minerals are mainly quartz, chlorite, and dolomite. The main chemical composition of the ore is: Cu 1.2%, Fe 2.6%, S 2.0%, CaO 12.1%, MgO 9.5%, TC 9.5%. After crushing, the oxygen-sulfur mixed copper ore yielded a particle size of P... 80 For a sample with a diameter of 10 mm, 10 kg / t of lime was mixed in during the crushing process.

[0090] In this embodiment, a column leaching system is used to simulate heap leaching, and a collection tank is used to simulate a qualified liquid container. After the ore is piled into the leaching column, the leaching column is sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device are both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution is a mixture of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5 and a total ammonia concentration of 2 mol / L.

[0091] The dripping solution is applied to the ore pile through a dripping pipe at a dripping rate of 24 L / m. 2 • h. The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the copper, ammonia, calcium, and magnesium ion concentrations in the leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 78%, ammonia consumption was 0.9 kg / t, and the calcium content of the leachate was... 2+ 75ppm, Mg 2+ 3.0 ppm, no precipitation formed.

[0092] Comparative Example 1

[0093] The ore sample used in this comparative study was a cobalt-bearing copper oxide ore sample. The copper oxide ore included malachite, cuprite, azurite, and chrysocolla; the gangue minerals were mainly quartz, chlorite, and dolomite. The main chemical composition of the ore was: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yielded a particle size of P... 80 For a sample with a diameter of 10 mm, 10 kg / t of lime was mixed in during the crushing process.

[0094] Heap leaching was simulated using a column leaching system, and a collection tank was used to simulate a qualified liquid container. After ore was piled into the leaching column, the leaching column was not sealed with an HDPE membrane, and neither the collection tank nor the mixing and clarification tank of the extraction device was covered or sealed. Ammonia solution, a mixture of ammonium sulfate and ammonium carbonate, with a pH of 8.5, a total ammonia concentration of 2 mol / L, and a dripping rate of 24 L / m³, was dripped onto the ore heap. 2 h.

[0095] The pH of the copper-containing leachate was controlled at 8.5 during the leaching process. Samples were taken and analyzed to determine the concentrations of copper, ammonia, calcium ions, and magnesium ions in the leachate. The copper-containing leachate was then fed into an extraction unit and extracted using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 65%, ammonia consumption was 3.5 kg / t, and the calcium content of the leachate was [not specified]. 2+ 461ppm, Mg 2+ 11.7 ppm, no precipitate formed.

[0096] In Comparative Example 1, after the sealing film and airtight conditions were removed, compared with Examples 1-15, the amount of ammonia volatilization increased, the ammonia consumption increased significantly, and the copper leaching rate decreased within the same leaching time.

[0097] Comparative Example 2

[0098] The ore sample used in this comparative study was a cobalt-bearing copper oxide ore sample. The copper oxide ore included malachite, cuprite, azurite, and chrysocolla; the gangue minerals were mainly quartz, chlorite, and dolomite. The main chemical composition of the ore was: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yielded a particle size of P... 80 For samples with a diameter of 10 mm, crushed ore should not contain 10 kg / t of lime.

[0099] A column leaching system was used to simulate heap leaching, and a collection tank was used to simulate a qualified leaching container. After ore was piled into the leaching column, the column was sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction unit were both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution was a mixture of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5, a total ammonia concentration of 2 mol / L, and a dripping rate of 24 L / m³. 2 ·h.

[0100] The pH of the copper-containing leachate was 7.2 during the leaching process. No alkali was added to adjust the pH of the copper-containing solution. Samples were taken and analyzed to determine the copper, ammonia, calcium ion, and magnesium ion concentrations in the copper-containing leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 11%, the ammonia consumption was 0.25 kg / t, and the calcium content of the leachate was [not specified]. 2+ 1237ppm, Mg 2+ 1009ppm, no precipitate formation to clog pipelines.

[0101] In Comparative Example 2, no alkali was added to the ore, resulting in a decrease in the pH of the leachate during leaching, leading to a lower copper leaching rate. Furthermore, a large amount of calcium and magnesium ions dissolved into the leachate. In this comparative example, the leachate pH was lower, preventing precipitation, but the copper leaching rate was very low.

[0102] Comparative Example 3

[0103] The ore sample used in this comparative study was a cobalt-bearing copper oxide ore sample. The copper oxide ore included malachite, cuprite, azurite, and chrysocolla; the gangue minerals were mainly quartz, chlorite, and dolomite. The main chemical composition of the ore was: Cu 0.6%, Co 0.2%, Fe 2.1%, CaO 15.9%, MgO 11.9%, TC 8.1%. After crushing, the copper oxide ore yielded a particle size of P... 80 For samples with a diameter of 10 mm, crushed ore should not contain 10 kg / t of lime.

[0104] A column leaching system was used to simulate heap leaching, and a collection tank was used to simulate a qualified liquid container. After ore was piled into the leaching column, the column was sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction device were both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The ammonia solution was a mixture of ammonium sulfate and ammonium carbonate, stored in a sealed drip container, with a pH of 8.5, a total ammonia concentration of 2 mol / L, and a dripping rate of 24 L / m³. 2 ·h.

[0105] The pH of the copper-containing leachate during the leaching process was 7.2. Alkali was added to adjust the pH of the copper-containing solution to 8.5. Samples were taken to analyze the copper, ammonia, calcium ion, and magnesium ion concentrations in the copper-containing leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 35%, the ammonia consumption was 0.35 kg / t, and the calcium content of the leachate was [not specified]. 2+ 1017ppm, Mg 2+ 250ppm, a large amount of precipitate forms, clogging the pipeline.

[0106] In this comparative example, no alkali is added to the ore, resulting in a large amount of calcium and magnesium ions dissolving into the leachate. In contrast, this comparative example adds alkali to the solution to increase the pH of the leachate in order to improve the copper leaching rate. Consequently, the dissolved calcium and magnesium ions will form precipitates that clog the pipelines, affecting continued leaching.

[0107] Comparative Example 4

[0108] The ore sample used in this comparative treatment was an oxygen-sulfur mixed copper ore sample. The main copper ores included malachite, cuprite, azurite, chalcopyrite, chalcocite, covellite, and chalcopyrite; the gangue minerals were mainly quartz, chlorite, and dolomite. The main chemical composition of the ore was: Cu 1.2%, Fe 2.6%, S 2.0%, CaO 12.1%, MgO 9.5%, TC 9.5%. After crushing, the oxygen-sulfur mixed copper ore yielded a particle size of P... 80 For samples with a diameter of 10 mm, no lime is mixed in during the crushing process.

[0109] A column leaching system was used to simulate heap leaching, and a collection tank was used to simulate a qualified leaching container. After ore was piled into the leaching column, the column was sealed with an HDPE membrane. The collection tank and the mixing and clarification tank of the extraction unit were both covered and sealed to reduce ammonia volatilization, keep the ore pile warm, and control the water balance. The drip solution was a mixture of ammonium sulfate and ammonium carbonate, stored in a sealed drip solution container, with a pH of 8.5, a total ammonia concentration of 2 mol / L, and a dripping rate of 24 L / m³. 2 ·h.

[0110] During the leaching process, the pH of the leachate was 7.8. Alkali was added to control the pH of the copper-containing leachate to 8.5. Samples were taken to analyze the copper, ammonia, calcium, and magnesium ion concentrations in the copper-containing leachate. The copper-containing leachate was then sent to an extraction unit for extraction using LIX84-1 extractant. The raffinate was returned to the leaching process, and ammonia was recycled. After 30 days of testing, the copper leaching rate was 38%, ammonia consumption was 0.8 kg / t, and the calcium content of the leachate was [not specified]. 2+ 1180ppm, Mg 2+ 1851ppm, a large amount of precipitate formed, clogging the pipeline.

[0111] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A method for ammonia heap leaching of copper oxide ore, characterized in that, Includes the following steps: S1. Mix copper oxide ore with alkali and pile it up. After the pile is completed, install drip irrigation pipes on the surface of the pile. S2. If the particle size of the copper oxide ore is less than 10mm, directly cover the surface of the ore pile with a sealing film. If the particle size of the copper oxide ore is greater than 10mm, first cover the surface of the ore pile with river sand or river pebbles, and then cover the surface of the river sand or river pebbles with a sealing film. S3. Ammonia solution is pre-prepared as the leaching solution and stored in the leaching solution container. The leaching solution is connected to the leaching pipe and the leaching solution container by a pump. The leaching solution is pumped to the surface of the ore pile and dripped onto the surface of the ore pile through the leaching pipe to achieve copper leaching by distributing the solution to the ore pile. The copper-containing leaching solution obtained by copper leaching flows out from the bottom of the ore pile. When the copper concentration of the copper-containing leaching solution meets the preset qualified solution standard, it enters the qualified solution container; otherwise, it enters the intermediate solution container. The copper-containing leaching solution in the qualified solution container is sent to the extraction device. The raffinate after extraction is returned to the leaching solution container, and the ammonia in the raffinate is recycled.

2. A method for heap leaching copper oxide ore using ammonia, characterized in that, Includes the following steps: S1. Mix copper oxide ore with alkali and ammonium salt and pile it up. After the pile is completed, install drip irrigation pipes on the surface of the pile. S2. If the particle size of the copper oxide ore is less than 10mm, directly cover the surface of the ore pile with a sealing film. If the particle size of the copper oxide ore is greater than 10mm, first cover the surface of the ore pile with river sand or river pebbles, and then cover the surface of the river sand or river pebbles with a sealing film. S3. Clean water is stored as the dripping liquid in a dripping liquid container, and a pump connects the dripping pipe and the dripping liquid container. The dripping liquid is pumped to the surface of the ore pile and dripped onto the surface of the ore pile through the dripping pipe, causing the ammonium salt to dissolve and realizing the copper leaching of the ore pile. The copper-containing leaching solution obtained from copper leaching flows out from the bottom of the ore pile. When the copper concentration of the copper-containing leaching solution meets the preset qualified solution standard, it enters the qualified solution container; otherwise, it enters the intermediate solution container. The copper-containing leaching solution in the qualified solution container is sent to the extraction device. The raffinate after extraction is returned to the dripping liquid container, and the ammonia in the raffinate is recycled.

3. The method according to claim 1 or 2, characterized in that, The drip liquid container, intermediate liquid container, qualified liquid container, and mixing and clarification tank of the extraction device are all in a sealed state.

4. The method according to claim 1 or 2, characterized in that, The copper oxide ore includes any one of the following: single copper oxide ore, cobalt-bearing copper oxide ore, nickel-bearing copper oxide ore, zinc-bearing copper oxide ore, and oxygen-sulfur mixed copper ore, with a Cu content of 0.1-10% by mass.

5. The method according to claim 1 or 2, characterized in that, In step S1, the mined raw copper oxide ore is directly piled up, and alkali and / or ammonium salts are added to mix with the copper oxide ore during the pile-building process; or, the raw copper oxide ore is first crushed, and then the crushed copper oxide ore is piled up, and alkali and / or ammonium salts are added to mix with the copper oxide ore during the crushing and / or pile-building process, and the particle size of the crushed copper oxide ore is P80 = 5mm-300mm.

6. The method according to claim 1 or 2, characterized in that, In step S1, the alkali is one or more of lime, sodium hydroxide, sodium carbonate and ammonium carbonate. Based on the dry weight of each ton of original copper oxide ore, 1-100 kg of lime is mixed in each ton of original copper oxide ore, or 0.5-20 kg of sodium hydroxide, sodium carbonate or ammonium carbonate is mixed in.

7. The method according to claim 1 or 2, characterized in that, In step S2, the sealing membrane is an HDPE membrane with a thickness of 1-3 mm or a PE membrane with a thickness of 0.1-0.5 mm and 2-5 layers; the river sand or river pebbles covering the surface of the ore pile have a particle size of 0.5-50 mm.

8. The method according to claim 1, characterized in that, In step S3, the ammonia solution is prepared using one or more of the following: ammonium sulfate, ammonium chloride, ammonium fluoride, ammonium nitrate, ammonium carbonate, ammonium bicarbonate, and ammonia water. The total ammonia concentration of the ammonia solution is 0.5-5 mol / L.

9. The method according to claim 2, characterized in that, In step S1, the ammonium salt includes one or more of ammonium sulfate, ammonium chloride, ammonium fluoride, ammonium nitrate, ammonium carbonate, and ammonium bicarbonate.

10. The method according to claim 1 or 2, characterized in that, In step S3, when the pH of the copper-containing leaching solution is >10.0, ammonium sulfate or ammonium chloride is added to the dripping solution; when the pH of the copper-containing leaching solution is <7.5, one or a combination of lime, sodium hydroxide, sodium carbonate, ammonium bicarbonate, or ammonium carbonate is added to the dripping solution to control the pH of the copper-containing leaching solution between 7.5 and 10.0; the dripping rate of the dripping solution is 6-100 L / m³. 2 ·h.

Images