JPS5829147B2 - Copper lead separation flotation method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a copper-lead separation flotation process.

More specifically, the present invention relates to a flotation method for separating copper and lead from a copper-lead mixed concentrate such as a copper-lead integrated concentrate or a lead-phase concentrate extracted from complex sulfide ores.

Copper-lead separation in the process of recovering valuable metals from complex sulfide ores involves first extracting copper-lead composite concentrate from the raw ore as a floating ore through flotation treatment, and then converting this composite concentrate into copper and lead through flotation treatment. The method of separation is usually adopted.

As a flotation method to separate copper-lead from copper-lead general concentrate, a specific collector is used when extracting copper-lead general concentrate from complex sulfide ore, and the characteristics of the collector are used to separate copper-lead. It is suggested that you use it.

For example, when Erofloat is used as a collector to recover copper-lead integrated concentrate as a floating ore from complex sulfide ores, the collector loses its floating properties in the resulting copper-lead mixed concentrate liquid. It has been proposed to separate and recover copper concentrate as floating ore and lead concentrate as settled ore by heating to a certain temperature.

However, with this method, if the mineral solution is heated to a temperature at which the scavenger on the galena surface decomposes, the scavenger on the chalcopyrite surface will actually be affected, making it impossible to effectively suspend the copper. There are many things.

Therefore, in order to improve the copper recovery rate, if a new collector is added to the heated mineral liquid and the copper-lead is separated, the recovery rate of lead as well as copper will increase as shown in Figure 1. However, there is a problem in that effective separation of copper-lead is hindered.

As a result of intensive research to solve these problems and perform effective copper-lead separation, the present inventors found that it is extremely effective to bring mineral liquid into contact with carbon dioxide gas when separating copper-lead from copper-lead mixed concentrate. The present invention was developed based on this finding.

That is, the present invention is a copper-lead separation flotation method characterized in that when separating a copper-lead mixed concentrate into copper and lead, the mineral liquid is brought into contact with carbon dioxide gas.

The present invention will be explained in detail below.

In the present invention, a concentrate mainly containing copper and/or lead is used as the copper-lead mixed concentrate.

To describe an example of extracting copper-lead mixed concentrate from complex sulfide ore, first, the raw ore is appropriately crushed and adjusted to the specified particle size, which is then adjusted to the specified pulp concentration, and then a flotation agent is added to flotate the ore. Serve.

Among the flotation agents used here, the collecting agent is appropriately selected from among xanthate, eroflot, etc., taking into consideration the collecting ability for copper lead, selectivity for zinc pyrite, etc., and the influence on the subsequent separation flotation. Or use in combination.

In the present invention, the collecting agent used to recover the copper-lead integrated concentrate as floating ore is not particularly limited, and any of xanthate, eroflot, etc. may be used.

The separated and recovered copper-lead integrated concentrate is then subjected to flotation separation into copper concentrate and lead concentrate.

The mineral liquid used to separate copper and lead is heated as necessary and then brought into contact with carbon dioxide gas.

The contacting method is a conventional method such as blowing.

In this case, the carbon dioxide gas may of course be carbon dioxide gas itself, but bicarbonate or the like may also be used.

In that case, it can also be used by directly adding it to the mineral liquid and generating carbon dioxide gas by heating.

However, in this case, it is necessary to select a mineral solution that does not have an adverse effect on the separation of copper and lead when added to the mineral solution.

An example of adding bicarbonate is when flotation separation of copper and lead involves heating the mineral liquid and adding bicarbonate.

As a result of the addition of bicarbonate, carbon dioxide gas is generated and comes into contact with the mineral liquid, but it is thought that the effect of contact between the mineral liquid and carbon dioxide gas suppresses the floatability of lead.

A similar effect was also obtained when carbon dioxide gas was injected into the mineral liquid.

Therefore, when bicarbonate is used, the mineral liquid must be heated because it is necessary to generate carbon dioxide gas through decomposition, but heating is sometimes preferable even when carbon dioxide gas is being blown into the solution, and this is selected as necessary.

For example, heating is preferred when separating copper and lead from a copper-lead integrated concentrate extracted from complex sulfide ores.

However, when removing copper from lead phase concentrates, effective copper-lead separation can be achieved without heating the mineral liquor.

In addition, when recovering copper concentrate from mineral liquid by flotation, the required amount of bicarbonate is added or the required amount of carbon dioxide gas is blown into the copper concentrate, and then the copper concentrate is subjected to flotation separation.

In flotation separation, it is preferable to add a collector or the like to increase the flotation of copper.

By the method of the present invention, (1) high-grade copper concentrate can be recovered from copper-lead integrated concentrate.

(2) High-grade lead concentrate can be recovered.

(3) Even if a collector is added during the separation of copper and lead, it not only does not have an adverse effect on the separation of lead and copper, but is also effective in the separation.

(4) Copper can be selectively recovered even when the copper content is significantly lower than lead.

Effects such as this can be obtained.

Furthermore, examples will be shown and explained in detail as specific examples of the present invention.

Example 1 Add 3 kg/T of slaked lime to the mineral solution of complex sulfide ore containing sulfides of copper, lead, zinc, and iron from mine A, and adjust the pH of the mineral solution with SO2 water.
After setting it to 5.5, add 35kg/Erofloat +208.
The copper-lead integrated concentrate collected as a floating ore with the addition of 30 F/T of T and Takasafloss 41-5 was re-milled and subjected to the next test.

■ Add 500 g/T of sodium bicarbonate to the mineral solution, heat the mineral solution, and after 5 minutes have elapsed since the temperature reached 70°C, add 40 g/T of #5 Kukasa Floss and perform flotation treatment for 9 minutes to obtain copper concentrate. was recovered as floating ore.

The results are shown in Table 1.

■ Add 5001/T of sodium bicarbonate to the mineral solution, heat the mineral solution, and 5 minutes after reaching 70℃, add 20 g/T of Eroflot+208 as a scavenger and 40 g/T of Takasafloss #5. The copper concentrate was recovered as floating ore by flotation treatment for 9 minutes.

The results are shown in Table 2.

■ Heat the mineral solution to 70℃ and add Takasafloss 5 after 30 minutes.
was added at 40 g/T and subjected to flotation treatment for 9 minutes to recover copper concentrate as floating ore.

The results are shown in Table 3.

■ Heating the mineral solution to 70℃ and after 30 minutes, using Eroflot #208 as a collecting agent and 209/T and Takasafloss +5 as a collecting agent.
0 g/T was added and flotation was carried out for 9 minutes to recover copper concentrate as floating ore.

The results are shown in Table 4.

From these results, in addition to extremely reducing the lead content in the copper concentrate obtained by the method of the present invention, the recovery rate of the lead concentrate recovered as precipitate is also significantly improved, and the copper content is reduced. That is understood.

Incidentally, the lead grade of the lead concentrate recovered as precipitate can be easily increased by a normal method without reducing the recovery rate.

In addition, in the case of only heating, adding a collector to this improves the copper recovery rate, but at the same time lead also becomes floating ore, which is not very effective.

On the other hand, in the method of the present invention, the lead content in the copper concentrate decreases as a result of the addition of the scavenger, which improves the lead recovery rate of the lead concentrate as precipitate and improves the quality of the copper concentrate. This is a significant improvement over the heating-only method.

Example 2 A copper-lead integrated concentrate collected from a beneficiation system for treating complex sulfide ores of Mine A was used to carry out a copper-lead separation flotation test using the method of the present invention and simply by heating.

The above-mentioned general concentrate is made into a pulp with a concentration of 40%, and bicarbonate of soda is added to it with a concentration of 500%. Add ii'/T and heat to 68°G.
After maintaining the temperature for 5 minutes, use Eroflot 4208 as a collection agent.
Flotation treatment was carried out by adding 20g/T1 of Takasa Floss 11:5 at a ratio of 209/T.

In addition, a method using only heating involves heating mineral solution with a pulp concentration of 4% to 7%.
After 15 minutes at 0°C, Eroflot-
Flotation treatment was carried out by adding 209/T of II-208 and 20 g/T of Takasa Floss-11=5.

The floating ore in the flotation process was collected at regular intervals, and the results are shown in the figure as the cumulative recovery rate of copper and lead.

The final result is almost similar to that of the painting method, but in the middle of the process, the method according to the present invention is much better at separating copper and lead, and when combined with careful selection and cleaning selection, it is much more effective. A good copper-lead separation can be achieved.

Example 3 Copper 1. Lead 1. Coarse lead concentrate ore collected from complex sulfide ore (black ore) containing zinc and iron sulfides by the all-bulk straight method is made into a pulp with a pulp concentration of 15% and is introduced into a conditioned tank where carbon dioxide gas is extracted from the cylinder at a rate of 311 minutes. After stirring for about 10 minutes, the copper concentrate was separated and recovered as floating ore and lead concentrate as precipitate.

Feed ore, floating ore, in the decopper flotation system from this lead phase concentrate,
An example of chemical analysis of deposits is shown in Table 5 below.

It is impossible to effectively remove copper from such lead phase concentrates by conventional methods (for example, suppressing lead with dichromate), and good separation was only possible by blowing in carbon dioxide gas.

The separation results when decopper flotation is performed using dichromate without using carbon dioxide gas are shown in Table 6, and as the flotation of copper is not promoted, the contamination of copper into the lead concentrate is prevented. many.

[Brief explanation of drawings]

The figure is a diagram showing the cumulative recovery rate of copper-lead by the flotation treatment shown in Example 2. In the figure, curve 1 shows the separation results obtained by the method of the present invention, and curve 2 shows the separation results obtained by simply heating.

Claims (1)

[Claims] 1. A copper-lead separation flotation method characterized by bringing the ore liquid into contact with carbon dioxide gas when flotating and separating copper and lead from copper-lead mixed concentrate.