Beneficiation method for improving recovery rate of wide-size-fraction argillaceous porphyry copper ore

Abstract

The invention discloses a beneficiation method for improving the recovery rate of wide-size-fraction argillaceous porphyry copper ore, and belongs to the technical field of mineral processing. The method comprises the following steps: carrying out SABC grinding on raw ore to obtain ore pulp with the particle fraction of less than 74 mu m and the proportion of 58-67%, and grading according to the particle size of 10 mu m; one-time roughing, two-time concentration and three-time scavenging flotation is conducted on the particle size fraction larger than 10 micrometers, lime, a collecting agent and a foaming agent are added in roughing, the collecting agent and the foaming agent are added in three times of scavenging operation, middlings generated in all the operations return to the previous operation in sequence, concentrate obtained in the second concentration operation is final copper concentrate, and tailings obtained in the third scavenging operation are final tailings. And one-roughing-one-concentration-two-scavenging flotation column-column separation is carried out on the particles with the particle size of 10 micrometers or below, gangue inhibitors and collecting agents are added in all the operations, concentrate obtained after column separation is sent to the first bulk flotation separation operation, middlings in the other column separation operations return to the previous operation in sequence, and tailings obtained in the second column scavenging operation are final slime. The method can efficiently separate argillaceous minerals and fine-fraction copper, and the recovery rate of copper and molybdenum is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore. Background Art

[0002] Copper is present in the Earth's crust at a mass abundance of approximately 0.01%, often forming symbiotic composite deposits with other minerals. As one of the few naturally occurring metals with excellent electrical and thermal conductivity and cold-working ductility, copper has become a fundamental component of numerous industrial sectors, including power transmission, electronics manufacturing, and new energy equipment. The world's proven industrial copper deposits can be divided into four main genetic types: porphyry, copper-bearing sandstone, copper-bearing pyrite, and copper-nickel sulfide. Porphyry copper deposits, due to their large-scale mineralization, contribute over 60% of the world's copper reserves and dominate the global copper concentrate supply.

[0003] At a porphyry copper mine in a high-altitude, frigid region, extensive surface moraine and mud are introduced with increasing mining depth. Currently, mixed flotation processes face a wide range of selected particle sizes, with fine copper ore (-10μm or less) accounting for over 20% and a significant increase in mud content. This leads to increased reagent consumption and a sharp drop in recovery rates. Using traditional desludging processes followed by flotation, most of the fine copper is removed along with the muddy minerals, further compromising copper and molybdenum recoveries.

[0004] In view of the problems existing in the technical background, the present invention aims to provide a mineral processing method for improving the recovery rate of wide-grained muddy porphyry copper ore, through a specific reagent system combined with an improved flotation process, in order to significantly reduce the loss of copper during mineral processing. Summary of the Invention

[0005] The object of the present invention is to provide a mineral processing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore.

[0006] The object of the present invention is achieved by: the ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore comprises the following steps: (1) The ore pulp obtained by the SABC grinding process, which contains 58-67% of the particle size below 74 μm, is classified to a particle size of 10 μm; (2) The particles above 10 μm enter the mixed flotation process and undergo flotation in the steps of one coarse, two fines and three scavenging operations. Lime, collector and frother are added in the coarse operation, and collector and frother are added in the three scavenging operations. The middlings produced in each operation are returned to the previous operation in sequence. The concentrate from the 2nd fines operation is the final copper concentrate, and the tailings from the 3rd scavenging operation is the final tailings. (3) The particle size of 10 μm and below enters the fine-grained copper selection process, and undergoes a flotation column selection process of one coarse, one fine, and two sweeps. Gangue inhibitors and collectors are added to all operations. The concentrate from the column selection is transported to the mixed flotation selection operation 1, and the ores from the remaining column selection operations are returned to the previous operation in sequence. The tailings from the column sweeping operation 2 are the final ore slime.

[0007] The technical solution of the present invention has the following advantages compared with the prior art: 1. The technical solution adopts a graded branch flotation method to eliminate the interference of ore slime on the original flotation process. For particle sizes above 10 μm, a collector composed of a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphate sulfide esters is used together with diesel to ensure the efficient recovery of copper, molybdenum, gold and silver in the raw ore.

[0008] 2. Use flotation column equipment for particle sizes of 10 μm and below to enhance the capture of fine-grained copper minerals. On the other hand, the high-molecular organic matter of hydroxypropyl cellulose sodium xanthate has a selective characteristic adsorption for sulfide ores, especially sulfide ores below 10 μm, and will not adsorb on the surface of gangue such as quartz. In combination with N, N-dialkyl dithiocarbamates and hydrocarbon dithiophosphate thioether esters collectors, the recovery of fine-grained copper minerals from mud is further enhanced.

[0009] 3. In the technical solution, the combined use of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose can effectively inhibit gangue minerals such as quartz, amphibole, chlorite and mica, and further promote the effective separation of copper minerals and gangue minerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a process flow chart of the technical solution of the present invention; Figure 2 It is the process flow chart of the original technical solution. DETAILED DESCRIPTION

[0011] The present invention is further described below, but is not intended to limit the present invention in any way. Any changes or substitutions made based on the teachings of the present invention fall within the scope of protection of the present invention.

[0012] The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore of the present invention comprises the following steps: (1) The ore pulp obtained by the SABC grinding process, which contains 58-67% of the particle size below 74 μm, is classified to a particle size of 10 μm; (2) The particles above 10 μm enter the mixed flotation process and undergo flotation in the steps of one coarse, two fines and three scavenging operations. Lime, collector and frother are added in the coarse operation, and collector and frother are added in the three scavenging operations. The middlings produced in each operation are returned to the previous operation in sequence. The concentrate from the 2nd fines operation is the final copper concentrate, and the tailings from the 3rd scavenging operation is the final tailings. (3) The particle size of 10 μm and below enters the fine-grained copper selection process, and undergoes a flotation column selection process of one coarse, one fine, and two sweeps. Gangue inhibitors and collectors are added to all operations. The concentrate from the column selection is transported to the mixed flotation selection operation 1, and the ores from the remaining column selection operations are returned to the previous operation in sequence. The tailings from the column sweeping operation 2 are the final ore slime.

[0013] The lime described in step (2) is prepared into a lime emulsion with a mass concentration of 9-15%, and the amount used is 300-400g per ton of raw ore.

[0014] The collector described in step (2) is a mixture of N,N-dialkyl dithiocarbamates and hydrocarbon dithiophosphate sulfide esters in a mass ratio of 70-78%:30-22%.

[0015] The collector described in step (2) is used together with diesel. Based on per ton of raw ore, the collector for roughing operation is a mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide ester in a mass ratio of 70-78%:30-22%, the amount of the mixture is 60-90g, and the amount of diesel is 5-15g; The collector for sweeping operation 1 is a mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide ester in a mass ratio of 70-78%:30-22%. The amount of the mixture is 20-30g, and the amount of diesel is 2-5g. The collector for sweeping and selecting operation 2 is a mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide ester in a mass ratio of 70-78%:30-22%. The amount of the mixture is 15-25g, and the amount of diesel is 1-3g. The collector for sweeping and selecting operation 3 is a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphoric acid sulfide esters in a mass ratio of 70-78%:30-22%. The amount of the mixture is 10-18g, and the amount of diesel is 1-3g.

[0016] The foaming agent in step (2) is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%.

[0017] When the foaming agent described in step (2) is used, the foaming agent for the roughing operation is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30% per ton of raw ore, and the amount used is 20-38g; The foaming agent for sweeping operation 1 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 20-38g; The foaming agent for sweeping and selecting operation 2 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 15-20g; The foaming agent for sweeping and selecting operation 3 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 10-13g.

[0018] The main component of the 2# oil is terpene alcohol, which has a cyclic structure and three isomers, namely α-terpene alcohol, β-terpene alcohol, and γ-terpene alcohol.

[0019] The gangue inhibitor in step (3) is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%.

[0020] When the gangue inhibitor described in step (3) is used, the gangue inhibitor for the flotation column roughing operation is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the amount used is 100-200g per ton of raw ore; The gangue inhibitor for column concentration operation is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 20-40g; The gangue inhibitor for column sweeping operation 1 is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 80-100g; The gangue inhibitor for column sweeping and selection operation 2 is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 40-60g.

[0021] The collector in step (3) is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%.

[0022] When the collector described in step (3) is used, the collector for the flotation column roughing operation is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the amount used is 70-95g per ton of raw ore; The collector for column concentration is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 10-25g; The collector for column sweeping operation 1 is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 30-38g; The collector for column sweeping operation 2 is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 10-25g.

[0023] Example 1

[0024] The ore selected in this embodiment is a large porphyry copper mine in Yunnan Province, and the raw ore contains 0.32% copper and 0.007% molybdenum.

[0025] The beneficiation methods are as follows: (1) After the raw ore passes through the SABC grinding process, a pulp with a particle size of 74 μm or less accounting for 63.6% is obtained, which enters the cyclone for classification. The classification fineness is based on the particle size of 10 μm. The pulp above 10 μm enters the mixed flotation operation, and the pulp of 10 μm and below enters the fine-grained copper separation operation.

[0026] (2) The ore pulp with a particle size of 10μm and above enters the mixed flotation process and undergoes "one coarse - two fine - three sweep" flotation.

[0027] For each ton of raw ore, 350g of lime emulsion with a mass concentration of 10% is added to the mixing drum. A collector is used in conjunction with diesel fuel: a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphorothioate sulfides (77.5%:22.5% by mass). The collector dosage is 88g, and the diesel fuel dosage is 12g. A frother is a mixture of methyl isobutyl carbinol and No. 2 oil (60%:40% by mass). The rougher concentrate is fed to the finishing process, while the rougher tailings are fed to the scavenging process.

[0028] The flotation scavenging process is repeated three times. The concentrate (middlings) produced by each scavenging process are returned to the previous process in sequence. The tailings from scavenging process 3 are the final tailings. The collector used in all three scavenging processes is a mixture of N,N-dialkyl dithiocarbamates and hydrocarbyl dithiophosphate sulfides in a ratio of 77.5%:22.5% by weight. The frother is a mixture of methyl isobutyl carbinol and No. 2 oil in a ratio of 60%:40% by weight. Per ton of raw ore, the collector dosage in scavenging process 1 is 25g, the diesel dosage is 3g, and the frother dosage is 25g; the collector dosage in scavenging process 2 is 18g, the diesel dosage is 2g, and the frother dosage is 18g; the collector dosage in scavenging process 3 is 13g, the diesel dosage is 2g, and the frother dosage is 10g.

[0029] Flotation and concentration operations are carried out twice. The flotation roughing concentrate first enters the cyclone for classification, and the fineness is controlled to be below 47μm, accounting for 85%. The middlings produced by the concentration operation are returned to the previous operation in sequence. The concentrate produced by the concentration 2 operation is the final copper concentrate.

[0030] (3) The ore pulp with a particle size of 10μm and below enters the fine-grained copper selection process and undergoes flotation column selection in a "one coarse - one fine - two sweep" process. Gangue inhibitors and collectors are added to all operations.

[0031] The gangue inhibitor used in the flotation column roughing operation is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a weight ratio of 15%:25%:60%. The collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a weight ratio of 55%:45%. The gangue inhibitor dosage is 180g and the collector dosage is 90g per ton of ore. The roughing concentrate is fed to the column cleaning operation, while the roughing tailings are fed to the column scavenging operation.

[0032] The column sweeping operation is performed twice. The concentrate (middlings) from each column sweeping operation are returned to the previous operation in sequence. The tailings from column sweeping operation 2 constitute the final sludge. The gangue inhibitor is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a mass ratio of 15%:25%:60%. The collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 55%:45%. The amount of gangue inhibitor used per ton of raw ore in column sweeping operation 1 is 85g, and the amount of collector used is 33g. The amount of gangue inhibitor used in column sweeping operation 2 is 50g, and the amount of collector used is 18g.

[0033] The concentrate produced by the column concentrator process is transported to the first concentrator stage of mixed flotation, while the tailings are returned to the rougher flotation column concentrator stage. The gangue inhibitor is a mixture of sodium ligninsulfonate, sodium humate, and hydroxyethyl cellulose in a mass ratio of 15%:25%:60%. The collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 55%:45%. The amount of gangue inhibitor used in the column concentrator process is 38g, and the amount of collector is 18g per ton of raw ore.

[0034] Example 2

[0035] The ore selected in this embodiment is the same as that in Example 1.

[0036] The beneficiation methods are as follows: (1) After the raw ore passes through the SABC grinding process, a pulp with a particle size of 74 μm or less accounting for 66% is obtained, which enters the cyclone for classification. The classification fineness is based on the particle size of 10 μm. The pulp above 10 μm enters the mixed flotation operation, and the pulp of 10 μm and below enters the fine-grained copper separation operation.

[0037] (2) The ore pulp with a particle size of 10μm and above enters the mixed flotation process and undergoes "one coarse - two fine - three sweep" flotation.

[0038] For each ton of raw ore in the flotation roughing process, 300g of lime emulsion with a mass concentration of 15% is added to the mixing tank. A collector is used in conjunction with diesel fuel: a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphoric acid sulfides in a 70%:30% mass ratio. The collector dosage is 60g, and the diesel fuel dosage is 15g. A frother is a mixture of methyl isobutyl carbinol and No. 2 oil in a 65%:35% mass ratio. The dosage is 20g. Roughing concentrate proceeds to the finishing process, while roughing tailings proceed to the scavenging process.

[0039] The flotation scavenging process is repeated three times. The concentrate (middlings) produced by each scavenging process are returned to the previous process in sequence. The tailings from scavenging process 3 are the final tailings. The collector used in all three scavenging processes is a 70%:30% mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide esters, and the frother is a 60%:40% mixture of methyl isobutyl carbinol and No. 2 oil. Per ton of raw ore, the collector dosage for scavenging process 1 is 20g, the diesel dosage is 5g, and the frother dosage is 20g; the collector dosage for scavenging process 2 is 15g, the diesel dosage is 3g, and the frother dosage is 15g; and the collector dosage for scavenging process 3 is 10g, the diesel dosage is 3g, and the frother dosage is 11g.

[0040] Flotation and concentration operations are carried out twice. The flotation roughing concentrate first enters the cyclone for classification, and the fineness is controlled to be below 47μm, accounting for 85%. The middlings produced by the concentration operation are returned to the previous operation in sequence. The concentrate produced by the concentration 2 operation is the final copper concentrate.

[0041] (3) The ore pulp with a particle size of 10μm and below enters the fine-grained copper selection process and undergoes flotation column selection in a "one coarse - one fine - two sweep" process. Gangue inhibitors and collectors are added to all operations.

[0042] The gangue inhibitor for the flotation column roughing operation is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a 10%:15%:75% by weight ratio. The collector is a 50%:50% mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate. The dosage of gangue inhibitor is 100g and the dosage of collector is 95g per ton of ore. The concentrate from the roughing operation is fed to the column cleaning operation, while the tailings from the roughing operation are fed to the column scavenging operation.

[0043] The column sweeping operation is performed twice. The concentrate (middlings) from each column sweeping operation are returned to the previous operation in sequence. The tailings from column sweeping operation 2 constitute the final sludge. The gangue inhibitor is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a ratio of 10%:15%:75% by weight; the collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a ratio of 50%:50% by weight. Calculated per ton of raw ore, the gangue inhibitor dosage for column sweeping operation 1 is 80g, and the collector dosage is 38g; for column sweeping operation 2, the gangue inhibitor dosage is 40g, and the collector dosage is 25g.

[0044] The concentrate produced by the column concentrator process is transported to the first concentrator stage of mixed flotation, while the tailings are returned to the rougher flotation column concentrator stage. The gangue inhibitor is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a ratio of 10%:15%:75% by weight; the collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a ratio of 50%:50% by weight. The dosage of gangue inhibitor and collector used in the column concentrator process is 20g and 25g per ton of raw ore, respectively.

[0045] Example 3

[0046] The ore selected in this embodiment is the same as that in Example 1.

[0047] The beneficiation methods are as follows: (1) After the raw ore passes through the SABC grinding process, a pulp with a particle size of 74 μm or less accounting for 60% is obtained, which enters the cyclone for classification. The classification fineness is based on the particle size of 10 μm. The pulp above 10 μm enters the mixed flotation operation, and the pulp of 10 μm and below enters the fine-grained copper separation operation.

[0048] (2) The ore pulp with a particle size of 10μm and above enters the mixed flotation process and undergoes "one coarse - two fine - three sweep" flotation.

[0049] For each ton of raw ore in the flotation roughing operation, 400g of lime emulsion with a mass concentration of 9% is added to the mixing drum. A collector is used in conjunction with diesel fuel: a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphorothioate sulfides (78%:22% by mass). The collector dosage is 90g, and the diesel dosage is 5g. A frother is a mixture of methyl isobutyl carbinol and No. 2 oil (70%:30% by mass). The roughing concentrate is fed to the cleaning process, while the roughing tailings are fed to the scavenging process.

[0050] The flotation scavenging process is repeated three times. The concentrate (middlings) produced by each scavenging process are returned to the previous process in sequence. The tailings from scavenging process 3 are the final tailings. The collector used in all three scavenging processes is a mixture of N,N-dialkyl dithiocarbamates and hydrocarbyl dithiophosphate sulfides in a ratio of 78%:22% by weight. The frother is a mixture of methyl isobutyl carbinol and No. 2 oil in a ratio of 70%:30% by weight. Per ton of raw ore, the collector dosage in scavenging process 1 is 30g, the diesel dosage is 2g, and the frother dosage is 38g; the collector dosage in scavenging process 2 is 25g, the diesel dosage is 1g, and the frother dosage is 20g; and the collector dosage in scavenging process 3 is 18g, the diesel dosage is 1g, and the frother dosage is 13g.

[0051] Flotation and concentration operations are carried out twice. The flotation roughing concentrate first enters the cyclone for classification, and the fineness is controlled to be below 47μm, accounting for 85%. The middlings produced by the concentration operation are returned to the previous operation in sequence. The concentrate produced by the concentration 2 operation is the final copper concentrate.

[0052] (3) The ore pulp with a particle size of 10μm and below enters the fine-grained copper selection process and undergoes flotation column selection in a "one coarse - one fine - two sweep" process. Gangue inhibitors and collectors are added to all operations.

[0053] The gangue inhibitor used in the flotation column roughing operation is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a 25%:30%:45% by weight ratio. The collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a 65%:35% by weight ratio. The gangue inhibitor dosage is 200g and the collector dosage is 70g per ton of ore. The roughing concentrate is fed to the column cleaning operation, while the roughing tailings are fed to the column scavenging operation.

[0054] The column sweeping operation is performed twice. The concentrate (middlings) from each column sweeping operation are returned to the previous operation in sequence. The tailings from column sweeping operation 2 constitute the final sludge. The gangue inhibitor is a mixture of sodium lignin sulfonate, sodium humate, and hydroxyethyl cellulose in a mass ratio of 25%:30%:45%. The collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 65%:35%. The dosage of gangue inhibitor and collector per ton of ore in column sweeping operation 1 is 100g, and 30g, respectively. The dosage of gangue inhibitor and collector in column sweeping operation 2 is 60g, and 10g, respectively.

[0055] The concentrate produced by the column concentrator process is transported to the first concentrator stage of mixed flotation, while the tailings are returned to the rougher flotation column concentrator stage. The gangue inhibitor is a mixture of sodium ligninsulfonate, sodium humate, and hydroxyethyl cellulose in a mass ratio of 25%:30%:45%; the collector is a mixture of sodium hydroxypropyl cellulose xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 65%:35%. The dosage of gangue inhibitor and collector per ton of raw ore in the column concentrator process is 40g and 10g, respectively.

[0056] Example 4

[0057] ——Comparative Example The properties of the raw ore are consistent with those of Example 1, except that the slurry after SABC grinding does not use a classification process and a fine-grain copper separation process. The specific steps are as follows: (1) After the raw ore undergoes the SABC grinding process, a pulp with particles below 74 μm accounting for 63.6% is obtained, and the overflow enters the flotation operation mixing tank; (2) Add 380g / t of lime, 100g / t of collector MCO, and 38g / t of foaming agent HCCL into a mixing barrel and perform mixed roughing to obtain a primary roughing concentrate and a primary roughing tailings; (3) The coarse concentrate from the primary roughing is sent to the cyclone for classification, with the fineness required to be controlled to be below 47 μm, accounting for 85%. The classified sand is sent to the vertical mill for regrinding to form a closed circuit, and the classified overflow is sent to the flotation column for the first selection operation. The concentrate obtained from the first selection operation is sent to the second selection operation, and the tailings from the first selection operation are returned to the roughing operation; (4) The concentrate obtained from the second beneficiation operation is the final copper concentrate, and the tailings obtained from the second beneficiation operation are returned to the first beneficiation operation; (5) The first roughing tailings are added with a collector of MCO 28g / t and a foaming agent of HCCL 16g / t and enter the scavenging operation 1. The concentrate obtained from the scavenging operation 1 is returned to the roughing operation; the tailings obtained from the scavenging operation 1 are added with a collector of MCO 15g / t and a foaming agent of HCCL 10g / t and enter the scavenging operation 2; the concentrate obtained from the scavenging operation 2 is returned to the scavenging operation 1, and the tailings from the scavenging operation 2 are added with a collector of MCO 15g / t and a foaming agent of HCCL 8g / t and enter the scavenging operation 3; the concentrate obtained from the scavenging operation 3 is returned to the scavenging operation 2, and the resulting tailings are the final tailings.

[0058] Note: Collector MCO and foaming agent HCCL are commercially available and are used on site.

[0059] Table 1 is a comparison of the indicators of Example 1 and the comparative example

[0060] As can be seen from the comparison in Table 1, according to the process flow and reagent system of the present invention, the copper grade of the concentrate obtained is increased by 1.31% and the molybdenum grade is increased by 0.02% compared with the original process. The copper recovery rate is increased by 3.48% and the molybdenum recovery rate is increased by 2.46% compared with the original process.

Claims

1. A mineral processing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore, characterized in that: The steps include: (1) The ore pulp obtained by the SABC grinding process, which contains 58-67% of the particle size below 74 μm, is classified to a particle size of 10 μm; (2) The particles above 10 μm enter the mixed flotation process and undergo flotation in the steps of one coarse, two fines and three scavenging operations. Lime, collector and frother are added in the coarse operation, and collector and frother are added in the three scavenging operations. The middlings produced in each operation are returned to the previous operation in sequence. The concentrate from the 2nd fines operation is the final copper concentrate, and the tailings from the 3rd scavenging operation is the final tailings. (3) The particle size of 10 μm and below enters the fine-grained copper selection process, and undergoes a flotation column selection process of one coarse, one fine, and two sweeps. Gangue inhibitors and collectors are added to all operations. The concentrate from the column selection is transported to the mixed flotation selection operation 1, and the ores from the remaining column selection operations are returned to the previous operation in sequence. The tailings from the column sweeping operation 2 are the final ore slime.

2. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 1, characterized in that: The lime described in step (2) is prepared into a lime emulsion with a mass concentration of 9-15%, and the amount used is 300-400g per ton of raw ore.

3. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 1, characterized in that: The collector described in step (2) is a mixture of N,N-dialkyl dithiocarbamates and hydrocarbon dithiophosphate sulfide esters in a mass ratio of 70-78%:30-22%.

4. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 3, characterized in that: The collector described in step (2) is used together with diesel. Based on per ton of raw ore, the collector for roughing operation is a mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide ester in a mass ratio of 70-78%:30-22%. The amount of collector used is 60-90g, and the amount of diesel used is 5-15g. The collector for sweeping operation 1 is a mixture of N,N-dialkyl dithiocarbamate and alkyl dithiophosphoric acid sulfide ester in a mass ratio of 70-78%:30-22%. The amount of collector used is 20-30g, and the amount of diesel used is 2-5g. The collector for sweeping and selecting operation 2 is a mixture of N,N-dialkyl dithiocarbamate and hydrocarbyl dithiophosphate sulfide ester in a mass ratio of 70-78%:30-22%. The amount of collector used is 15-25g, and the amount of diesel used is 1-3g. The collector for sweeping and selecting operation 3 is a mixture of N,N-dialkyl dithiocarbamates and alkyl dithiophosphoric acid sulfide esters in a mass ratio of 70-78%:30-22%. The amount of the mixture is 10-18g, and the amount of diesel is 1-3g.

5. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 1, characterized in that: The foaming agent in step (2) is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%.

6. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 5, characterized in that: When the foaming agent described in step (2) is used, the foaming agent for the roughing operation is a mixture of methyl isobutyl carbinol and No. 2 oil in a mass ratio of 60-70%:40-30%, and the amount used is 20-38g per ton of raw ore; The foaming agent for sweeping operation 1 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 20-38g; The foaming agent for sweeping and selecting operation 2 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 15-20g; The foaming agent for sweeping and selecting operation 3 is a mixture of methyl isobutyl carbinol and 2# oil in a mass ratio of 60-70%:40-30%, and the dosage is 10-13g.

7. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 1, characterized in that: The gangue inhibitor in step (3) is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%.

8. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 7, characterized in that: When the gangue inhibitor described in step (3) is used, the gangue inhibitor for the flotation column roughing operation is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the amount used is 100-200g per ton of raw ore; The gangue inhibitor for column concentration operation is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 20-40g; The gangue inhibitor for column sweeping operation 1 is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 80-100g; The gangue inhibitor for column sweeping and selection operation 2 is a mixture of sodium lignin sulfonate, sodium humate and hydroxyethyl cellulose in a mass ratio of 10-25%: 15-30%: 75-45%, and the dosage is 40-60g.

9. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 1, characterized in that: The collector in step (3) is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%.

10. The ore dressing method for improving the recovery rate of wide-grained argillaceous porphyry copper ore according to claim 9, characterized in that: When the collector described in step (3) is used, the collector for the flotation column roughing operation is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the amount used is 70-95g per ton of raw ore; The collector for column concentration is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 10-25g; The collector for column sweeping operation 1 is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 30-38g; The collector for column sweeping operation 2 is a mixture of hydroxypropyl cellulose sodium xanthate and N,N-dialkyl dithiocarbamate in a mass ratio of 50-65%:50-35%, and the dosage is 10-25g.

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