Copper-nickel sulfide ore tailing concentration process

Abstract

The invention provides a copper-nickel sulfide ore tailing concentration process, the process adopts an operation process of twice concentration and dilution of pipeline concentration by tailing pond return water, the primary concentration adopts an efficient thickener for operation, and the secondary concentration adopts a deep-cone thickener for operation. In addition, tailings pond return water is added in the secondary concentration conveying stage to dilute the concentration of conveyed ore pulp. The method has the advantages that the size fraction of the tailings is relatively fine, so that the cost of the filter pressing process of the tailings is relatively high, a high-efficiency thickener is adopted for primary concentration operation, most of tailings can be returned, and the tailings conveying efficiency is improved. And the secondary concentration adopts a deep-cone thickener for concentration, so that tailing backwater which can be used by all backwater can be recycled finally. In addition, the tailing pond'wastewater 'stored for a long time is mainly used for the underflow concentration of the deep-cone thickener. And forming a technological process that water is completely used.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and in particular relates to a copper-nickel sulfide ore tailings concentration process. Background Art

[0002] With the annual increase in the amount of ore mining by enterprises, the water consumption of non-ferrous metal beneficiation plants has increased year by year, and the consumption of clean water has also increased. The increase in industrial clean water indicates that the use of residents' domestic water will be affected, especially in the arid northwest region. Reducing the use of industrial clean water is also an urgent technical problem that needs to be solved.

[0003] 80% of the water in the ore dressing plant is mixed in the tailings. The traditional primary concentration process can only concentrate the tailings to about 38%-45%, of which 55% of the return water is transported to the tailings pond. Due to the complex composition of non-ferrous metal tailings, which often contain sulfur, calcium, magnesium and other ions, the return water transported to the tailings pond is oxidized to form high-salt, high-COD return water. Due to the high salinity, the return water from the tailings pond cannot be used in the grinding and flotation systems, resulting in most of the water being wasted in the tailings pond.

[0004] The technical challenges that need to be solved are to use the water mixed in the tailings in the production process as much as possible, reduce the amount of clean water added, and ensure that long-distance tailings transportation is not affected.

[0005] From the above table, we can see that SO4 2- , Cl - , Ca 2+ NH 4+ The ion content is high, including SO4 2- The content is 4058.5 mg / L, mainly due to the addition of (NH 4+ )2SO4 2- or CuSO4 2- Residue in tailings return water. SO4 in tailings return water 2- The content is 4521.6 mg / L, mainly due to the addition of (NH 4+ )2SO4 2- or CuSO4 2- Residue in tailings return water.

[0006] How to solve the above technical problems has become the direction of efforts of those skilled in the art. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a high-efficiency concentration process suitable for sulfide copper-nickel ore tailings, which can effectively increase the amount of tailings return water, reduce the amount of return water lost in the tailings pond, and improve the inherent safety of the tailings pond.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: (1) The copper-nickel sulfide ore tailings with a concentration of 15%-20% are concentrated once by a high-efficiency thickener. The tailings slurry produced by the first concentration has a concentration of 35-40%. The tailings return water enters the grinding system for grinding operations, and the tailings produced by the first concentration enter the secondary concentration operation; In the first concentration, 5g flocculant is added per ton of tailings, and the flocculant dilution concentration is added at 2‰; the first concentration produces 4295t / h of return water.

[0009] (2) After primary concentration, the tailings are pressurized and transported to the secondary concentration area for concentration. The secondary concentration is concentrated using a deep cone thickener to produce tailings slurry with a concentration of 50-60%. The produced return water is transported to the grinding operation.

[0010] In the secondary concentration, 15g flocculant is added per ton of tailings, and the flocculant dilution concentration is added at 2‰; the secondary concentration produces 4833t / h of return water.

[0011] (3) The tailings produced in step (2) are diluted with the backwater from the tailings pond to a slurry concentration of 35-40%, and the slurry is pressurized and transported to the tailings pond for storage using a diaphragm pump; In the initial stage of production, the tailings concentrated to 38% are directly transported to the tailings pond for storage by the secondary concentration diaphragm pump without secondary concentration. After 5-6 months, backwater is gradually generated in the tailings pond. After the backwater is produced, the backwater in the tailings pond is transported to the secondary concentration area through the backwater pump station.

[0012] The beneficial effects of the present invention are as follows: 1. The advantage of the present invention is that 38% of tailings can be produced in one concentration, and at the same time, the slurry pump can only transport 38% of the slurry over a long distance, which can be highly matched with the site, and at the same time, the transportation flow rate from the first concentration to the second concentration slurry is guaranteed within 10km, ensuring that the slurry does not sink in the pipe.

[0013] 2. The secondary concentration of the present invention is arranged in the middle position between the tailings pond and the primary concentration. The secondary concentration can ensure sufficient return water and also play the role of pressurized transportation. At the same time, the return water can be collected as much as possible.

[0014] 4. The "waste water" stored for a long time in the tailings pond of the present invention cannot be used. The waste water in the tailings pond returns to the secondary concentration area to dilute the pipeline concentration, displace the return water of the secondary concentration operation, and at the same time ensure the alternating flow of the return water in the tailings pond, which greatly reduces the amount of return water entering the tailings pond and improves the operation efficiency of the tailings pond.

[0015] 5. Existing mineral processing and concentration production practices show that compared with high-efficiency thickeners, deep cone thickeners have better thickening effects on tailings. This is because the deep cone thickener itself is relatively high, and in the process of adding flocculants, it can achieve a more efficient concentration. In addition, the deep cone thickener has a more obvious thickening effect on fine-grained tailings. Compared with high-efficiency thickeners that can only concentrate to 40%, deep cone thickeners can concentrate fine-grained tailings to 55%, while the dosage remains unchanged, and the water production is more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The invention relates to a highly efficient concentration process for copper-nickel sulfide ore tailings. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Example

[0018] The ore sample used is a tailings pulp of Jinchuan sulfide copper-nickel mine, with tailings fineness of -200 mesh accounting for 80% and concentration of 20%. The tailings particle size in this pulp sample is relatively fine, and the concentrated water production in the on-site process is relatively small, which seriously affects the output of tailings return water. Figure 1The tailings output is 30,000 d / t. The proportion of -200 mesh in the slurry of the primary concentration operation is 80%, and the concentration is 20%. Two high-efficiency thickeners with a diameter of 70 meters are used for primary concentration. The primary concentration operation is carried out according to the scheme of adding 5g flocculant per ton of tailings and the flocculant dilution concentration of 2‰. The tailings slurry concentration produced by the primary concentration is 38%, and the solid content of the overflow water is below 200ppm. The return water is used in the grinding operation. After comparison, the indicators do not change much, as shown in Table 2. The slurry concentrated by 38% in the first concentration is transported to the secondary concentration area 10km away. The secondary concentration uses four deep cone thickeners with a diameter of 25 meters. The proportion of -200 mesh in the slurry of the secondary concentration operation is 80%, and the slurry concentration is diluted from 38% to 10%. The operation is carried out according to the scheme of adding 15g flocculant per ton of tailings and the flocculant dilution concentration is 2‰. The tailings are concentrated to 55% after secondary concentration. At the beginning of production, the tailings concentrated to 38% are directly transported to the tailings pond by the secondary concentration diaphragm pump without secondary concentration. After 5-6 months, backwater is gradually generated in the tailings pond. After the backwater is produced, the backwater in the tailings pond is transported to the secondary concentration area through the backwater pump station. At the same time, the secondary concentration system is started. 3 / h of return water is pumped into the secondary concentration to dilute the bottom flow concentration of the deep cone thickener. At the same time, it is diluted into 38% slurry and transported to the tailings pond for storage. The output return water is shown in Table 3.

[0019] It can be seen from the above embodiments that, under the condition that the properties of tailings remain unchanged, the secondary concentration tailings backwater is used to lift 12911t / d. From the above results, the secondary concentration process has a good effect on the tailings backwater lifting.

Claims

1. A copper-nickel sulfide ore tailings concentration process, characterized in that: The steps include: (1) The copper-nickel sulfide ore tailings with a concentration of 15%-20% are concentrated once by a high-efficiency thickener. The tailings slurry produced by the first concentration has a concentration of 35-40%. The tailings return water enters the grinding system for grinding operations, and the tailings produced by the first concentration enter the secondary concentration operation; (2) The tailings after primary concentration are transported under pressure to the secondary concentration area for concentration. The secondary concentration is concentrated by a deep cone thickener to produce tailings slurry with a concentration of 50-60%. The produced return water is transported to the grinding operation; (3) The tailings produced in step (2) are diluted with the return water from the tailings pond to a slurry concentration of 35-40%, and the slurry is pressurized and transported to the tailings pond for storage using a diaphragm pump.

2. The copper-nickel sulfide ore tailings concentration process according to claim 1, characterized in that: In step (1), 5 g of flocculant is added per ton of tailings for the first concentration, and the flocculant dilution concentration is added at 2‰.

3. The copper-nickel sulfide ore tailings concentration process according to claim 1, characterized in that: In step (1), the primary concentration produces 4295 t / h of return water.

4. The copper-nickel sulfide ore tailings concentration process according to claim 1, characterized in that: In step (2), 15 g of flocculant is added per ton of tailings during the secondary concentration, and the flocculant dilution concentration is added at 2‰.

5. The copper-nickel sulfide ore tailings concentration process according to claim 1, characterized in that: In step (2), the secondary concentration produces 4833 t / h of return water.

6. The copper-nickel sulfide ore tailings concentration process according to claim 1, characterized in that: In the initial stage of production, the tailings with a concentration of 35-40% of the primary concentrated slurry are directly transported to the tailings pond for storage by the secondary concentration diaphragm pump without secondary concentration. After 5-6 months, backwater is gradually generated in the tailings pond. After the backwater is produced, the backwater in the tailings pond is transported to the secondary concentration area through the backwater pump station.

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