Copper recovery and sulfur reduction graded utilization process for copper ore waste rocks

Abstract

The invention provides a copper recovery and sulfur reduction graded utilization process for copper ore waste rocks, which comprises the following steps of: crushing and screening the waste rocks to obtain oversize products and undersize products; performing X-ray sorting on the oversize product to obtain a sorted copper-rich high-sulfur product and a sorted low-sulfur product; finely crushing the separated low-sulfur product, combining with the screen underflow, and screening to obtain a coarse-fraction product, a medium-fraction product and a fine-fraction product; performing jigging reselection on the medium-grade product to obtain a reselected copper-rich high-sulfur product and a reselected low-sulfur product, and performing photoelectric color selection on the reselected low-sulfur product to obtain low-sulfur aggregate and secondary aggregate; and after the fine fraction products are screened, oversize materials and undersize materials are obtained, the undersize materials are subjected to jigging reselection, and reselected copper-rich high-sulfur products and reselected tailings are obtained. The grade of the recovered copper ore meets the requirement for the selected grade of a selection plant, the copper recovery rate is high, and the sulfur content of the waste ore is reduced to the maximum extent; the combined process flow is simple, the system treatment capacity is high, and large-scale implementation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of copper ore waste rock recovery, in particular to a process for grading utilization of copper recovery and sulfur reduction from copper ore waste rock. Background Art

[0002] The copper grade of the waste rock of a copper mine in Jiangxi is 0.252 - 0.351%, the stockpile is about 10.6 million tons, and the annual increment is about 0.6 million tons. If the low-grade copper ore waste rock fails to be fully utilized, it will cause great waste of resources. The copper recovery and sulfur reduction from copper ore waste rock are beneficial to the large-scale disposal of solid waste, solving the environmental protection problems of enterprises, and improving the economic benefits of enterprises.

[0003] Patent document CN102500454A discloses an X-ray radiation pre-selection enrichment method for low-grade copper sulfide ore. The original ore of copper sulfide ore is crushed to ≤200 mm, and then screened. The size of the sieve hole is 20 - 50 mm. The undersize material is treated separately as middlings, and the oversize material is sorted by an X-ray radiation separator to obtain copper sulfide ore concentrate and copper sulfide ore tailings. In the undersize material of this method, the contents of copper and sulfur are still relatively high. However, how to further recover copper and sulfur from the undersize material is not involved. Summary of the Invention

[0004] The present invention provides a process for grading utilization of copper recovery and sulfur reduction from copper ore waste rock, in which the recovered copper ore grade meets the requirements of the selected ore grade of the concentrator, the recovery rate of copper metal is high, and the sulfur content in the waste rock is reduced to the greatest extent, providing beneficial conditions for the comprehensive utilization and harmless disposal of waste rock.

[0005] The technical solution of the present invention is realized as follows: A process for grading utilization of copper recovery and sulfur reduction from copper ore waste rock, comprising the following steps:

[0006] (1) Crushing and screening the waste rock to obtain oversize material and undersize material;

[0007] (2) Feeding the oversize material into X-ray separation to obtain a separated copper-rich and high-sulfur product and a separated low-sulfur product;

[0008] (3) Crushing the separated low-sulfur product in step (2) and combining it with the undersize material, and then screening to obtain a coarse-grained product, a medium-grained product, and a fine-grained product;

[0009] (4) Feeding the medium-grained product into jigging gravity separation to obtain a gravity-separated copper-rich and high-sulfur product and a gravity-separated low-sulfur product, and feeding the gravity-separated low-sulfur product into optoelectronic color sorting to obtain a low-sulfur aggregate and a secondary aggregate;

[0010] (5) After screening the fine-grained product, obtaining an oversize material and an undersize material, and subjecting the undersize material to jigging gravity separation to obtain a gravity-separated copper-rich and high-sulfur product and a gravity-separated tailing.

[0011] Further, in step (1), the particle size of the oversize is -120 + 30 mm, and the particle size of the undersize is -30 mm.

[0012] Further, in step (3), the particle size of the coarse fraction product is +30 mm, the particle size of the medium fraction product is -30 + 10 mm, and the particle size of the fine fraction product is -10 mm.

[0013] Further, the coarse fraction product is returned to the fine crushing operation in step (3), or used as -50 + 30 mm water stable material.

[0014] Further, in step (5), the particle size of the oversize is -10 mm + 4.75 mm, the particle size of the undersize is -4.75 mm, the gravity separation tailings are -4.75 mm machine-made sand, and the product with a particle size of -10 mm + 4.75 mm is returned to the screening operation in step (5) after sand making.

[0015] Advantages of the present invention:

[0016] (1) The combined process of raw ore classification - X-ray sorting - jigging gravity separation in the present invention obtains copper ore with a grade > 0.7%, meeting the requirements of the copper ore concentrator's feed grade, and a copper recovery rate of 86 - 90%.

[0017] (2) The present invention has a certain adaptability to the fluctuations of copper and sulfur grades and changes in mineral composition of waste rock raw materials through the process of X-ray sorting for copper recovery - fine crushing and classification of low-sulfur products - jigging gravity separation for copper recovery and sulfur reduction - optoelectronic color sorting for low-sulfur aggregate sorting, which is beneficial to improving the stability of the production system.

[0018] (3) The present invention can obtain some qualified low-sulfur aggregates, realize the resource utilization of part of the waste rock, minimize the discharge of waste rock to the greatest extent, and relieve the environmental protection pressure of solid waste discharge.

[0019] (4) The main sorting equipment of the present invention has a large processing capacity, dry sorting, is mature and reliable, has a high degree of automation, low operating costs, reduces the amount of ore fed into subsequent wet gravity separation and the water consumption of equipment, and is easy to operate and manage.

[0020] (5) The flexible process of the present invention can meet market demands, flexibly adjust the waste rock product structure such as water stable materials, aggregates and machine-made sand, and achieve timely consumption under the condition that the process equipment and layout remain unchanged. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 This is the process flow diagram of the present invention. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] As Figure 1 shown, a process for copper recovery, sulfur reduction and grading utilization of copper mine waste rock includes the following steps:

[0025] (1) Crushing and screening the waste rock to obtain products with a particle size range of -120 + 30 mm and products with a particle size range of -30 mm;

[0026] (2) The products with a particle size range of -120 + 30 mm enter X-ray sorting to obtain sorted copper-rich high-sulfur products and sorted low-sulfur products;

[0027] (3) After the X-ray sorted low-sulfur products are finely crushed and screened, they are combined with the products with a particle size range of -30 mm for screening to obtain products with a particle size range of +30 mm, products with a particle size range of -30 + 10 mm, and products with a particle size of -10 mm. The products with a particle size range of +30 mm are returned to the fine crushing operation;

[0028] (4) The products with a particle size range of -30 + 10 mm enter jigging gravity separation to obtain gravity separation copper-rich high-sulfur products and gravity separation low-sulfur products. The gravity separation low-sulfur products enter optoelectronic color sorting to obtain -30 + 10 mm low-sulfur aggregate and -30 + 10 mm secondary aggregate;

[0029] (5) The products with a particle size of -10 mm are screened to obtain products with a particle size range of -10 mm + 4.75 mm and products with a particle size of -4.75 mm. The products with a particle size of -4.75 mm are subjected to jigging gravity separation to obtain gravity separation copper-rich high-sulfur products and gravity separation tailings. The gravity separation tailings are -4.75 mm manufactured sand, and the products with a particle size range of -10 mm + 4.75 mm are returned to the screening operation after being made into sand.

[0030] The sorted copper-rich high-sulfur products in step (2), the gravity separation copper-rich high-sulfur products in steps (4) and (5) are combined into copper concentrate.

[0031] For copper mine waste rock with a feed copper grade of 0.329% and a sulfur grade of 3.34%, after beneficiation by the process of this embodiment, the product indexes are shown in the following table:

[0032]

[0033] Copper ore waste rock with a feed copper grade of 0.329% and a sulfur grade of 3.34% is processed using the process flow of X-ray sorting - fine crushing and classification - jigging gravity separation - optoelectronic color sorting, obtaining a product with a high copper and high sulfur yield of 38.05%, a copper grade of 0.749%, a sulfur grade of 6.67%, a copper recovery rate of 86.53%, a sulfur recovery rate of 75.96%, and a copper enrichment ratio of 2.27.

[0034] Using the process of X-ray sorting - fine crushing and classification - jigging gravity separation - optoelectronic color sorting, a copper ore grade > 0.7% is obtained, meeting the requirements of the copper ore concentrator's feed grade, with a copper recovery rate of 86.63%. This combined process flow is simple, has a large system processing capacity, is convenient for large-scale implementation, and has a certain adaptability to fluctuations in the copper and sulfur grades of waste rock raw materials and changes in mineral composition, which is beneficial to improving the stability of the production system.

[0035] Using the process flow of this embodiment, the product yield of the -120 + 30mm particle size grade accounts for 67.32%, totaling approximately 2,692 t / d. Considering the comprehensive sorting effect and the single-unit processing capacity of the equipment, selecting a single 1000-type X-ray separator to process the -120 + 30mm particle size waste rock can meet the design scale requirements of a 4000t / D waste rock comprehensive utilization project; then, in combination with the process of fine crushing and classification - jigging gravity separation - optoelectronic color sorting, the -30mm particle size waste rock is processed to improve the copper recovery rate and reduce the sulfur content in the waste rock.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A copper ore waste rock copper recovery, sulfur reduction and grading utilization process, characterized in that, It includes the following steps: (1) Crushing and screening the waste rock to obtain oversize material and undersize material; (2) Feeding the oversize material into X-ray separation to obtain separated copper-rich high-sulfur product and separated low-sulfur product; (3) Crushing the separated low-sulfur product in step (2) and merging it with the undersize material, then screening to obtain coarse-grained product, medium-grained product and fine-grained product; (4) Feeding the medium-grained product into jigging gravity separation to obtain gravity-separated copper-rich high-sulfur product and gravity-separated low-sulfur product, and feeding the gravity-separated low-sulfur product into optoelectronic color sorting to obtain low-sulfur aggregate and secondary aggregate; (5) After screening the fine-grained product, obtaining oversize material on the screen and undersize material under the screen, and subjecting the undersize material under the screen to jigging gravity separation to obtain gravity-separated copper-rich high-sulfur product and gravity-separated tailings.

2. The copper ore waste rock copper recovery, sulfur reduction and grading utilization process according to claim 1, characterized in that, In step (1), the particle size of the oversize material is -120 + 30 mm, and the particle size of the undersize material is -30 mm.

3. A copper ore waste rock copper recovery, sulfur reduction and grading utilization process according to claim 1, characterized in that, In step (3), the particle size of the coarse-grained product is +30 mm, the particle size of the medium-grained product is -30 + 10 mm, and the particle size of the fine-grained product is -10 mm.

4. A copper ore waste rock copper recovery, sulfur reduction and grading utilization process according to claim 1 or 3, characterized in that The coarse-grained product is returned to the crushing operation in step (3) or used as water-stable material of -50 + 30 mm.

5. A copper ore waste rock copper recovery and sulfur reduction grading utilization process according to claim 1, characterized in that, In step (5), the particle size of the oversize material on the screen is -10 mm + 4.75 mm, the particle size of the undersize material under the screen is -4.75 mm, the gravity-separated tailings are -4.75 mm machine-made sand, and the product with a particle size of -10 mm + 4.75 mm is returned to the screening operation in step (5) after sand making.

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