A method for recovering nickel and copper from a sulfide copper-nickel ore beneficiation concentrate leach residue

Abstract

The application discloses a method for recovering nickel and copper from leaching residue of a copper nickel sulfide ore dressing concentrate, and belongs to the technical field of nickel copper sulfide ore metallurgy, and comprises the following steps: S1, heating and stirring; S2, adding water and stirring; S3, adding chemicals and stirring; S4, flotation; and S5, concentration and filtration. The method adopts segmented stirring, one segment adopts high-concentration heating and stirring, and the second segment adopts new water dilution and stirring, so that the stirring time is prolonged and the stirring is strengthened, the dissolution of water-soluble nickel and copper compounds is promoted, the nickel and copper enter water, and the nickel and copper in water return to the leaching process with the filtering backwater, so that the recovery is realized, the residue amount of the leaching residue is effectively reduced, and the nickel and copper content in the tailings is reduced. Because the leaching residue slurry is acidic, the commonly used xanthate and black medicine type flotation collectors are easy to decompose and lose effectiveness under the condition of an acidic medium, the acid-resistant collector and the foaming agent are used, the nickel and copper sulfides can be floated in the low-pH slurry system, and the nickel and copper content in the tailings is reduced. When the tailings are filtered, the colloid material is less, the filtering process is accelerated, and the turnover rate of the filter press is improved.

Description

Technical Field

[0001] This invention belongs to the field of sulfide nickel-copper ore metallurgical technology, specifically relating to a method for recovering nickel and copper from leaching residue of sulfide copper-nickel ore beneficiation concentrate. Background Technology

[0002] Currently, after normal copper-nickel sulfide ores are leached from beneficiation concentrates, the leaching residue contains residual nickel-copper sulfides from incomplete leaching reactions. In addition, some nickel and copper exist in colloidal form. The leaching residue has a high nickel-copper content and a large amount of residue, which can easily lead to the dispersion and loss of nickel and copper metals during subsequent processing. The processing is also energy-intensive, uneconomical, and environmentally unfriendly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to extract the nickel and copper residues after a primary mineral processing step.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for recovering nickel and copper from leaching residue of copper-nickel sulfide ore concentrate includes the following steps:

[0006] S1 Heating and Stirring: The primary mineral processing leaching residue is fed into the No. 1 stirring tank for heating and stirring; the stirring temperature is 50-80 degrees Celsius; the stirring concentration is 50%-70%; and the stirring time is 10-20 minutes.

[0007] S2 Water Addition and Stirring: Feed the heated and stirred slurry into the No. 2 mixing tank, add fresh water and continue stirring; the stirring concentration is 20% to 40%, and the stirring time is 10 to 20 minutes;

[0008] S3 Addition and Stirring: Feed the slurry from step 2 into mixing tank #3, add flotation collector and frother, and stir evenly;

[0009] S4 Flotation: The slurry that has been stirred evenly in S3 is subjected to flotation. The concentrate obtained from the flotation is a nickel-copper sulfide concentrate, and the middlings obtained from the flotation are returned to the No. 2 mixing tank in S2. The scavenging concentration in the flotation is 20% to 40%, and the cleaning concentration in the flotation is 15% to 25%.

[0010] S5 Concentration and Filtration: The nickel-copper sulfide concentrate and the final tailings from S4 are concentrated and filtered. After concentration and filtration, nickel-copper sulfide, recycled water and leaching residue are obtained. The nickel-copper sulfide is returned to the leaching operation for re-leaching, the recycled water can be used as leaching water, and the leaching residue is stockpiled or treated.

[0011] In S3, the collector is a mixture of benzothiazole compounds, thiophosphates, and thiocarbamates; the acid-resistant foaming agent is a polypropylene glycol ether.

[0012] In S3, the amount of collector added is 100-300 g / t, and the amount of foaming agent is 50-100 g / t.

[0013] The flotation in S4 includes one roughing, one cleaning and one sweeping;

[0014] The roughing process yields a roughing concentrate and roughing tailings.

[0015] The rough concentrate is further refined to obtain concentrate and refined tailings;

[0016] The roughing tailings are then scavenged to obtain scavenged concentrate and tailings.

[0017] The selected tailings obtained from the fine selection and the scavenged concentrate obtained from the scavenging are combined into middlings.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention employs segmented stirring. The first stage involves high-concentration heating and stirring, while the second stage involves dilution and stirring with fresh water. This extends the stirring time and intensifies the stirring, promoting the dissolution of water-soluble nickel-copper compounds. This allows the nickel-copper to enter the water and be returned to the leaching process along with the filtered return water, thus achieving recovery. It also effectively reduces the amount of leaching residue.

[0020] Because the leaching residue slurry is acidic, commonly used xanthates and black powders are prone to decomposition and failure under acidic media conditions. This invention uses acid-resistant collectors and frothers, which can float nickel-copper sulfides in low pH slurry systems, thereby reducing the nickel-copper content in the tailings.

[0021] In this invention, the removal of colloidal substances during tailings filtration accelerates the filtration process and increases the turnover rate of the filter press. Attached Figure Description

[0022] Figure 1 yes Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, the method for recovering nickel and copper from leaching residue of copper-nickel sulfide ore concentrate according to the present invention includes the following steps:

[0026] S1 Heating and Stirring: The primary mineral processing leaching residue is fed into the No. 1 stirring tank for heating and stirring; the stirring temperature is 50-80 degrees Celsius; the stirring concentration is 50%-70%; and the stirring time is 10-20 minutes.

[0027] S2 Water Addition and Stirring: Feed the heated and stirred slurry into the No. 2 mixing tank, add fresh water and continue stirring; the stirring concentration is 20% to 40%, and the stirring time is 10 to 20 minutes;

[0028] S3 Addition and Stirring: Feed the slurry from step 2 into mixing tank #3, add flotation collector and frother, and stir evenly;

[0029] S4 Flotation: The slurry that has been stirred evenly in S3 is subjected to flotation. The concentrate obtained from the flotation is a nickel-copper sulfide concentrate, and the middlings obtained from the flotation are returned to the No. 2 mixing tank in S2. The scavenging concentration in the flotation is 20% to 40%, and the cleaning concentration in the flotation is 15% to 25%.

[0030] S5 Concentration and Filtration: The nickel-copper sulfide concentrate and the final tailings from S4 are concentrated and filtered. After concentration and filtration, nickel-copper sulfide, recycled water and leaching residue are obtained. The nickel-copper sulfide is returned to the leaching operation for re-leaching, the recycled water can be used as leaching water, and the leaching residue is stockpiled or treated.

[0031] In S3, the collector is a mixture of benzothiazole compounds, thiophosphates, and thiocarbamates; the acid-resistant foaming agent is a polypropylene glycol ether.

[0032] In S3, the amount of collector added is 100-300 g / t, and the amount of foaming agent is 50-100 g / t.

[0033] The flotation in S4 includes one roughing, one cleaning and one sweeping;

[0034] The roughing process yields a roughing concentrate and roughing tailings.

[0035] The rough concentrate is further refined to obtain concentrate and refined tailings;

[0036] The roughing tailings are then scavenged to obtain scavenged concentrate and tailings.

[0037] The selected tailings obtained from the fine selection and the scavenged concentrate obtained from the scavenging are combined into middlings.

[0038] Experiment 1: A certain leaching residue contained 9.29% nickel and 15.01% copper.

[0039] The leaching residue from the first mineral processing step is heated and stirred at 50°C for 10 minutes to a concentration of 50%. Fresh water is added to the heated and stirred slurry, and stirring continues for another 10 minutes to a concentration of 20%. Then, 100 g / t of flotation collector and 80 g / t of frother are added to the stirred slurry, and the mixture is stirred until homogeneous. The homogeneous slurry is then subjected to flotation, consisting of one roughing, one cleaning, and one scavenging process. The roughing and scavenging concentrations are 20%, and the cleaning concentration is 15%.

[0040] Experiment 2: A certain leaching residue contained 14.53% nickel and 10.95% copper.

[0041] The leaching residue from the first mineral processing step is heated and stirred at 60 degrees Celsius for 15 minutes to a concentration of 60%. Fresh water is added to the heated and stirred slurry, and stirring continues for another 15 minutes to a concentration of 30%. Then, 150 g / t of flotation collector and 100 g / t of frother are added to the stirred slurry, and the mixture is stirred until homogeneous. The homogeneous slurry is then subjected to flotation, consisting of one roughing, one cleaning, and one scavenging process. The roughing and scavenging concentration is 25%, and the cleaning concentration is 20%.

[0042] Example 3: A leaching residue contained 17.70% nickel and 9.06% copper.

[0043] The leaching residue from the first mineral processing step is heated and stirred at 70 degrees Celsius for 20 minutes to a concentration of 70%. Fresh water is added to the heated and stirred slurry, and stirring continues for 15 minutes to a concentration of 40%. 150 g / t of flotation collector and 100 g / t of frother are then added to the stirred slurry, and the mixture is stirred until homogeneous. The homogeneous slurry is then subjected to flotation, consisting of one roughing, one cleaning, and one scavenging process. The roughing and scavenging concentration is 40%, and the cleaning concentration is 25%.

[0044] The data indicators from the three experiments are as follows:

[0045]

[0046] *Water-soluble substances are soluble substances that dissolve into the water.

[0047] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the principles of the embodiments of the present invention.

Claims

1. A method for recovering nickel and copper from leaching residue of copper-nickel sulfide ore concentrate, characterized in that, Includes the following steps: S1 Heating and Stirring: The primary mineral processing leaching residue is fed into the No. 1 stirring tank for heating and stirring; the stirring temperature is 50-80 degrees Celsius; the stirring concentration is 50%-70%; and the stirring time is 10-20 minutes. S2 Water Addition and Stirring: Feed the heated and stirred slurry into the No. 2 mixing tank, add fresh water and continue stirring; the stirring concentration is 20% to 40%, and the stirring time is 10 to 20 minutes; S3 Addition and Stirring: Feed the slurry from step 2 into mixing tank #3, add flotation collector and frother, and stir evenly; S4 Flotation: The slurry that has been stirred evenly in S3 is subjected to flotation. The concentrate obtained from the flotation is a nickel-copper sulfide concentrate, and the middlings obtained from the flotation are returned to the No. 2 mixing tank in S2. The scavenging concentration in the flotation is 20% to 40%, and the cleaning concentration in the flotation is 15% to 25%. S5 Concentration and Filtration: The nickel-copper sulfide concentrate and the final tailings in S4 are concentrated and filtered. After concentration and filtration, nickel-copper sulfide, recycled water and leaching residue are obtained. The nickel-copper sulfide is returned to the leaching operation for re-leaching, the recycled water can be used as leaching water, and the leaching residue is stockpiled or treated. In S3, the collector is a mixture of benzothiazole compounds, thiophosphates, and thiocarbamates; the acid-resistant foaming agent is a polypropylene glycol ether. In S3, the amount of collector added is 100-300 g / t, and the amount of foaming agent is 50-100 g / t; The flotation in S4 includes one roughing, one cleaning and one sweeping; The roughing process yields a roughing concentrate and roughing tailings. The rough concentrate is further refined to obtain concentrate and refined tailings; The roughing tailings are then scavenged to obtain scavenged concentrate and tailings. The selected tailings obtained from the fine selection and the scavenged concentrate obtained from the scavenging are combined into middlings.

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