Copper oxide ore dressing test plan selection

I. Main schemes for the selection of copper oxide ore

Copper oxide ore sorting domestic and main program are summarized as follows:

(1) Flotation method: direct flotation, vulcanization flotation, etc.

(2) Water-smelting method: ammonia leaching method and acid leaching method.

(3) Leaching-precipitation-flotation method.

The first leaching with sulfuric acid, and then replaced with iron scrap copper, copper precipitate and then float flotation.

The second _3, CO ₂ extraction, sulfur (sulfur, pyrite, etc.) and then precipitated copper sulfide flotation with NH.

(4) Segregation-flotation method.

(5) Bacterial leaching method.

At present, the mines that have been put into production in China have been pre-vulcanized with sodium sulfide and then sorted by a single flotation method. But refractory oxide copper ore with a single flotation difficult to recycle, in order to solve this part of the use of resources, has conducted many research programs, the general trend is to require the use of mineral - metallurgical joint process or metallurgical processing methods. Abroad also the case, easy to handle Oxidized Copper also mainly flotation of refractory oxide copper ore is mostly joint process.

Second, the choice of protocol

This major ore sorting objects into copper oxide and pyrite, have tried first single flotation process, including flotation and bulk flotation process. It has been proved by practice that a single flotation scheme cannot be used, and satisfactory indicators cannot be obtained.

The understanding of the nature of the ore cannot be completed before the test. To truly understand the characteristics of the ore studied, it is ultimately necessary to rely on its own practice. After practice, understanding, practice, and recognizing, it is found that in the case of coarse ore, most of the copper oxide ore can be dissolved by water or dilute acid, and when it is finely ground, it is insoluble. The reason is that the mine contains a lot of limestone and other alkaline gangue. These gangues are not only bad for water smelting, but also cause the dissolved copper to re-precipitate, which makes water smelting and flotation difficult. This special rule of ore is mainly due to the fact that the copper oxide ore is in the oxidation zone of the sulfide deposit, and most of the ore and gangue are weathered as loose powder, which is caused by severe weathering. Mastering this rule of ore, we must make our own thoughts conform to the regularity of this objective outside world, change the original plan, and redefine the following scheme:

(1) Acid leaching-flotation (leaching flotation).

(2) Water immersion-flotation (leaching flotation).

The mine adopts a combined water-smelting-flotation process, which not only improves the copper index, but also improves the flotation of the leaching residue. However, due to the high content of pyrite in the ore, if the flotation is directly precipitated in the leaching pulp, the separation of copper and sulfur is difficult, so the method of separately treating the slag should be adopted. Since the ore contains a large amount of limestone , the leaching particle size cannot be used for flotation granularity, and the weathering property should be utilized to use coarse leaching. The water smelting process can be leached with water, and a 0.3%-1.0% dilute acid solution can also be used. Although the leaching rates of the two are quite different, the final indicators are very close.

The copper in the immersion liquid can be recovered by a general method such as iron powder replacement, sodium sulfide precipitation, or the like, and can also be extracted with an extracting agent to be concentrated and directly electrolyzed to produce electric copper. Fatty acid extraction was used in the test. (In the experiment, N510 extractant, ie, a-hydroxy 5 sec-octyl benzophenone oxime) was used, and good results were obtained.

From the process and method that has been done, the combined process of water and metallurgy-flotation is an effective method to treat this mine. Both water immersion-flotation and acid leaching-flotation can obtain satisfactory indicators.

The recommended treatment scheme has a coarse leaching particle size, a short leaching time, and no acid. This will be carried out automatically in the future washing process, so it is suitable for both ore properties and future production. However, due to the lack of production practices, further verification is required by expanding the trial.

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