Beneficiation method for enriching platinum group metals in complex copper-nickel sulfide ore

Abstract

The application discloses a beneficiation method for enriching platinum group metals in complex copper nickel sulfide ore, and relates to the technical field of metal beneficiation, which comprises the following steps: ore grinding and grading, nielson beneficiation, table concentration, overflow gravity separation, hydrocyclone grading and the like; after the grinding of the nickel copper sulfide ore, the graded sand is selected twice to obtain a first platinum group metal concentrate product; after the flotation of the graded overflow, the flotation concentrate is selected again to obtain a second platinum group concentrate product, and the two platinum group concentrate products are used for the smelting of noble metals, so that the original nickel copper flotation concentrate smelting process is separated, the platinum group metals are enriched early, and the dispersion and loss in the smelting process are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metal beneficiation, and more particularly to a beneficiation method for enriching platinum group metals in complex copper-nickel sulfide ores. Background Art

[0002] A complex nickel-copper sulfide mine is rich in platinum group metals. Platinum group metals are primarily found in the ore as independent minerals and sulfide minerals. For a long time, platinum group metals have been recovered as nickel-copper byproducts, dispersed in large quantities of flotation nickel-copper mixed concentrates. This mixed concentrate then enters the more complex pyrometallurgical and hydrometallurgical production processes. Traditional copper-nickel ore raw materials containing low-grade platinum group precious metals (contents ranging from a few grams to tens of grams per ton) are enriched during the complex and lengthy extraction of base metals such as nickel and copper. The precious metals are dispersed among various byproducts, resulting in significant losses and low recovery rates. This makes significant amounts of platinum group precious metals unrecoverable, resulting in permanent losses. Summary of the Invention

[0003] The purpose of the present invention is to treat platinum group metals as independent research objects, select platinum group metal concentrates that can be directly used for precious metal smelting, improve the enrichment ratio of platinum group metals in the mineral processing stage, and reduce losses and dispersion in subsequent smelting processes.

[0004] In order to achieve the above-mentioned object, the present invention specifically adopts the following technical solution: A beneficiation method for enriching platinum group metals in complex copper-nickel sulfide ore, comprising the following steps:

[0005] Step 1: crushing and grinding the raw ore, and using a cyclone to classify the ore discharge, and after classification, a fine-grained overflow product and a coarse-grained sand product are produced;

[0006] Step 2: The coarse-grained grit product from step 1 is fed into a mixing tank, stirred evenly, and then fed into a Nielsen concentrator for gravity separation to produce concentrate and tailings. The tailings are returned to the grinding process in step 1 for regrinding.

[0007] Step 3: The concentrate product in step 2 is fed into a mixing barrel, stirred evenly, and then fed into a shaking table for gravity separation to produce shaking table concentrate, shaking table middlings, and shaking table tailings. The shaking table concentrate can be directly used for precious metal smelting, and the shaking table middlings and shaking table tailings are returned to the grinding operation in step 1 for regrinding;

[0008] Step 4: The primary fine-grained overflow product in step 1 is subjected to flotation once, roughing twice, cleaning twice, and scavenging to produce flotation concentrate products and flotation tailings products;

[0009] Step 5: feeding the flotation concentrate product produced in step 4 into a hydrocyclone for classification, and classifying it into a secondary coarse-grained sand product and a secondary fine-grained overflow product;

[0010] Step 6: The secondary coarse-grained grit product produced in step 5 is stirred evenly in a mixing barrel and fed into a Nelson concentrator for gravity separation to produce a concentrate product and tailings product. The concentrate is a platinum group metal concentrate, and the tailings product and the secondary fine-grained overflow product in step 5 are a copper-nickel mixed concentrate.

[0011] Preferably, in step 1, the fineness of the primary fine particle overflow product is 70% to 90% of -200 mesh.

[0012] Preferably, in step 2, the feed concentration of the Nelson concentrator is 35% to 60%, the gravity acceleration of the Nelson concentrator is 80 to 120G, the cycle time is 40 to 60min, and the flushing water flow rate is 40 to 60m 3 / h.

[0013] Preferably, in step 3, the ore feeding concentration of the shaking table is 10% to 30%.

[0014] Preferably, in step 6, the feed concentration of the Nielsen concentrator is 40% to 60%, the gravity acceleration is 60 to 100G, the cycle time is 40 to 60min, and the flushing water flow rate is 20 to 40m 3 / h.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The process produces independent platinum group metal concentrates, which can be directly used for precious metal smelting processes, significantly improving the enrichment ratio of platinum group metals in the beneficiation stage and reducing the dispersion and loss of platinum group metals in the nickel-copper smelting process;

[0017] 2. Taking advantage of the fact that platinum group metals exist as independent minerals and metal sulfides in ores, the centrifugal force and gravity composite force field of the Nelson concentrator are used to enhance the specific gravity difference between platinum group metals and gangue minerals, thereby separating the platinum group metals from gangue minerals. By flotation of sulfide minerals, the flotation concentrate is further enriched to separate platinum group metals from nickel-copper sulfide ores. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention but are not intended to limit the present invention.

[0020] Example 1

[0021] See also Figure 1The present invention provides the following technical solution: a beneficiation method for enriching platinum group metals in complex copper-nickel sulfide ore, comprising the following steps:

[0022] Step 1: crushing and grinding the raw ore, and using a cyclone to classify the ore discharge. After classification, a fine-grained overflow product and a coarse-grained sand product are produced, and the fineness of the fine-grained overflow product is ensured to be 70% to 90% of -200 mesh;

[0023] Step 2: Feed the coarse-grained sand product from step 1 into a mixing barrel, stir it evenly, and then feed it into the Nielsen concentrator for gravity separation. The feed concentration of the Nielsen concentrator is 35% to 60%, the gravity acceleration of the Nielsen concentrator is 80 to 120G, the cycle time is 40 to 60min, and the flushing water flow rate is 40 to 60m 3 / h, after gravity separation, concentrate products and tailings products are produced, and the tailings products are returned to the grinding operation in step 1 for regrinding;

[0024] Step 3: The concentrate product in step 2 is fed into a mixing barrel, stirred evenly, and then fed into a shaking table for gravity separation. The shaking table feed concentration is 10% to 30%. After the shaking table gravity separation, shaking table concentrate, shaking table middlings, and shaking table tailings are produced. The shaking table concentrate can be directly used for precious metal smelting, and the shaking table middlings and shaking table tailings are returned to the grinding operation in step 1 for regrinding.

[0025] Step 4: The primary fine-grained overflow product in step 1 is subjected to flotation once, roughing twice, cleaning twice, and scavenging to produce flotation concentrate products and flotation tailings products;

[0026] Step 5: feeding the flotation concentrate product produced in step 4 into a hydrocyclone for classification, and classifying it into a secondary coarse-grained sand product and a secondary fine-grained overflow product;

[0027] Step 6: The secondary coarse-grained grit product produced in step 5 is mixed evenly in a mixing barrel and fed into the Nielsen concentrator for gravity separation. The feed concentration of the Nielsen concentrator is 40% to 60%, the gravity acceleration is 60 to 100G, the cycle time is 40 to 60min, and the flushing water flow rate is 20 to 40m 3 / h, and after gravity separation, concentrate products and tailings products are produced. The concentrate is a platinum group metal concentrate, and the tailings product and the secondary fine-grained overflow product in step 5 are a copper-nickel mixed concentrate.

[0028] In this embodiment, after grinding the nickel-copper sulfide ore, the classified sedimentation is subjected to two separations to obtain a first platinum group metal concentrate product; after flotation of the classified overflow, the flotation concentrate is further re-selected to produce a second platinum group concentrate product. The two platinum group concentrate products are supplied to subsequent precious metal smelting, which can be separated from the original nickel-copper flotation concentrate smelting process, so that the platinum group metals are enriched earlier and the dispersion and loss during the smelting process are reduced; taking advantage of the fact that platinum group metals exist in the ore as independent minerals and metal sulfides, the centrifugal force and gravity composite force field of the Nelson concentrator are used to enhance the specific gravity difference between the platinum group metals and the gangue minerals, thereby separating the platinum group metals from the gangue minerals; and by flotation of the sulfide minerals, the flotation concentrate is further enriched to separate the platinum group metals from the nickel-copper sulfide ore.

[0029] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A beneficiation method for enriching platinum group metals in complex copper-nickel sulfide ore, characterized in that: The following steps are involved: Step 1: crushing and grinding the raw ore, and using a cyclone to classify the ore discharge, and after classification, a fine-grained overflow product and a coarse-grained sand product are produced; Step 2: The coarse-grained grit product from step 1 is fed into a mixing tank, stirred evenly, and then fed into a Nielsen concentrator for gravity separation to produce concentrate and tailings. The tailings are returned to the grinding process in step 1 for regrinding. Step 3: The concentrate product in step 2 is fed into a mixing barrel, stirred evenly, and then fed into a shaking table for gravity separation to produce shaking table concentrate, shaking table middlings, and shaking table tailings. The shaking table concentrate can be directly used for precious metal smelting, and the shaking table middlings and shaking table tailings are returned to the grinding operation in step 1 for regrinding; Step 4: The primary fine-grained overflow product in step 1 is subjected to flotation once, roughing twice, cleaning twice, and scavenging to produce flotation concentrate products and flotation tailings products; Step 5: feeding the flotation concentrate product produced in step 4 into a hydrocyclone for classification, and classifying it into a secondary coarse-grained sand product and a secondary fine-grained overflow product; Step 6: The secondary coarse-grained grit product produced in step 5 is stirred evenly in a mixing barrel and fed into a Nelson concentrator for gravity separation to produce a concentrate product and tailings product. The concentrate is a platinum group metal concentrate, and the tailings product and the secondary fine-grained overflow product in step 5 are a copper-nickel mixed concentrate.

2. The beneficiation method for enriching platinum group metals in a complex copper-nickel sulfide ore according to claim 1, characterized in that: In the step 1, the fineness of the primary fine particle overflow product is 70% to 90% of -200 mesh.

3. The beneficiation method for enriching platinum group metals in a complex copper-nickel sulfide ore according to claim 1, characterized in that: In step 2, the feed concentration of the Nelson concentrator is 35% to 60%, the gravity acceleration of the Nelson concentrator is 80 to 120G, the cycle time is 40 to 60min, and the flushing water flow rate is 40 to 60m 3 / h.

4. The beneficiation method for enriching platinum group metals in a complex copper-nickel sulfide ore according to claim 1, characterized in that: In step 3, the ore feeding concentration of the shaking table is 10% to 30%.

5. The beneficiation method for enriching platinum group metals in a complex copper-nickel sulfide ore according to claim 1, characterized in that: In step 6, the feed concentration of the Nielsen concentrator is 40% to 60%, the gravity acceleration is 60 to 100G, the cycle time is 40 to 60 minutes, and the flushing water flow rate is 20 to 40m 3 / h.

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