JPS5952546A - Beneficiation of sulfide ore - Google Patents

Abstract

PURPOSE:To separate and collect bornite certainly in high yield, by inserting a magnetic separation process into the benecification process of a sulfide ore. CONSTITUTION:A complicated sulfide ore is subjected to Cu/Pb flotation to transfer Cu and Pb to a flotation side while Zn and pyrite to a precipitation side. The Cu/Pb floated ore is further subjected to Cu-Pb separation flotation and Cu is separated to a flotation side while Pb to a precipitation side to obtain a copper concentrate and a lead concentrate. The Zn/pyrite precipitation ore is subjected to Zn flotation to obtain a zinc concentrate. In this process, magnetic separation is inserted into either one of stages, that is, a stage A prior to Cu/Pb flotation, a stage B prior to Cu-Pb separation flotation and a stage C during obtaining the lead concentrate, especially, the stage C. In the magnetic separation process, when pulp containing bornite is supplied to a wet high magnetic force magnetic separator under magnetic field intensity of 10,000-20,000 Gauss, bornite is adhered to a matrix and, therefore, the matrix is taken out of a magnetic field after treatment to be washed by water and a bornite ore particle can be separated and recovered in high purity.

Description

[Detailed Description of the Invention] The present invention relates to a beneficiation method for sulfide minerals, and more specifically, in the conventional beneficiation method using flotation, it is difficult to transfer them stably to the copper concentrate side at a high yield. This paper relates to a beneficiation method for sulfide minerals so that bornite can be isolated and extracted with complete reliability and high yield.

VC, which obtains copper concentrate, lead concentrate, zinc concentrate, iron sulfide concentrate, etc. from complex sulfide minerals, uses a beneficiation method in which the milled ore is subjected to several stages of flotation and separated extraction. , the conventional flotation method removes bornite (bornite) present in sulfide minerals.
It was difficult to transfer Cu6FeS4)k copper concentrate n+++E stable material. That is, by utilizing the properties of the particle surface of conventionally produced bornite, 1. The solution used was to completely adsorb the scavenger on the particle surface, apply hydrophobic binding, and then subject it to flotation to separate and collect it from other mineral particles. During the grinding and flotation processes, the oxidation reaction progresses and the surface properties change significantly. As a result, the flotation properties change, resulting in a decrease in the actual yield and a decrease in quality. It was also common for rose trees to occur.

The present invention was made with the aim of solving the problem of sulfide mineral beneficiation based on bornite. As a result of various tests carried out by the present inventors for this purpose, general VC shows that bornite is classified as a non-magnetic mineral, but suitable magnetic beneficiation is required before and after flotation of sulfide minerals. It was found that bornite can be efficiently recovered with sufficiently high purity if the process is carried out.

Figure 1 shows a typical flow sheet for complex sulfide minerals.
, Pb'z is transferred to the floating ore side, Zn, Pyrite is transferred to the sinking ore side, and C! u, Pb floating ore [g et vc, cu-Pb separation flotation Vc-Thus (, uf floating ore, Pb'z separated into settled ore side to obtain copper concentrate and lead concentrate. On the other hand, C!u , Z of Pb flotation
n, pyrite precipitate 1d Zn flotation vc to obtain zinc concentrate. According to such conventional flotation Vc, as mentioned earlier, in F bornite, during Cu and Pb flotation, there are parts that cannot be floated on the floating ore side and parts that remain on the sinking ore side, and Cu-P
b Even with separate flotation, there will be a portion on the floating ore side that cannot be fully floated. Therefore, the recovery rate of copper concentrate decreases, and bornite is distributed in lead concentrate and other products, impairing their quality.

The present invention provides a mineral beneficiation method in which copper concentrate, lead concentrate, and zinc concentrate are separated and collected by flotation of such sulfide minerals, and in which parts such as (A), (B), and (0) in FIG. Good first step (C
), magnetic ore beneficiation is inserted to separate and recover bornite ore. Before Cu, Pb flotation (A in Figure 1) or before Cu-Pb separation flotation (B in Figure 1)
Although it is more advantageous to carry out the magnetic separation of the present invention at the stage of vc Iri (0) in terms of preventing the transition of bornite to the sedimentation side in the initial process, the amount of processing increases. It is preferable to apply the magnetic selection according to the invention in this (
Implementation at stage 0) can also have extremely large effects in actual operation11.

In this case, it is preferable to carry out Cu-Pb separation flotation f-7t classification (2 (for example, cyclone classification), coarse grain part and fine coarse part F classification, and then carry out on the coarse grain part.

When carrying out magnetic separation, it is possible to use either a dry method or a wet method, but if the particle size is fine in the case of the dry method, there may be a situation where other substances are brought in along with bornite, so the wet method has an advantage. are doing. Bulbs containing bornite have a total magnetic field strength of 10,000 to 20. (When ore is fed to a wet high-magnetic magnetic separator under JOO Gauss, bornite particles adhere to the matrix, but minerals such as sphalerite, sphalerite, and pyrite have a phenomenon in which VC flows down with water. After this treatment, by taking the mud and litox out of the magnetic field and washing it with water, bornite particles can be efficiently separated and recovered with high purity.In this case, it is important to appropriately adjust the magnetic field strength. Our test [, J: and i o, o, o,, o
Gauss.

At a lower magnetic field, the separation efficiency of bornite is as low as about 1j10 to 15 factors, but when it is set to io, ooo Gauss or higher, bornite is recovered with an efficiency of 85 factors or more.

This magnetic selection process may be performed in one stage, but the two-stage trench 1ζ may be performed in three stages. In the case of this multi-stage magnetic selection, the latter stage may be performed with a lower magnetic field than the earlier stage.

The magnetic material obtained by this magnetic separation process has a high quality bornite, so it can be used as it is for copper concentrate, while the magnetic material is made of galena, sphalerite, pyrite, and other sulfide minerals. Therefore, in the case of (A) in Figure 1, ijC! u, Pb
Flotation, in the case of (B) i 0u-, subjected to Pb separation flotation,
In case (C), it is recovered as lead concentrate.

In this way, according to the present invention, even if the surface oxidation state of bornite changes, or even if there is fluctuation I in the grade of the original ore, bornite in sulfide minerals is processed in the beneficiation process 1c to produce galena and sphalerite. It can be selectively extracted from zinc ore, pyrite, etc., and when extracting copper concentrate, lead concentrate, and zinc concentrate from complex sulfide minerals using the flotation method, it is possible to reliably and easily improve the quality of each. can.

Example 1 After cyclo/classifying the Cu-Pb separated flotation ore (Feed) from mine A ore processing plant with the grade shown in Table 1, and adjusting the particle size of the coarse grain part 1C to all minus 325 meso/yu. This is a nonorube with a concentration of 55, and this is a fully continuous magnetic separator with a single pulse electromagnet E H1,...
The amount of ore processed is 1.2 cm using two W-type hot-type high magnetic force separators (CF, 10 type) with a magnetic field strength of 20,000 Gauss. It was continuously supplied at Ot/hr. Roughly separated concentrate (RC
The coarse tailings (RT) were obtained, and the
By supplying coarse concentrate (RC), we can obtain refined concentrate (CIC) and refined tailings (OIT).

The quality and distribution rate of these Re1RT, CIC, and CIT are summarized in Table 1. As is clear from the results in Table 1, the copper grade in the CIC was extremely high, and it was found that bornite could be recovered as a refined concentrate due to the fact that it was a substantial stopper.

On the other hand, RT, CIT, Pb, and Zn grades are high, and when subjected to dezincification flotation, lead concentrate, iron sulfide concentrate, etc. are of high grade due to the removal of bornite. It will be possible to collect it.

Stream side 2 Table 2 shows the total pulp of copper-lead separated precipitate (mai, eggplant 325 metsuyu) from A mine processing plant with the grade shown (a degree, -1'
lJ Niz type electromagnetic type HIW type wet type high magnetic force machine (L4 type)v
When a magnetic field strength of 20,000 and 7% was supplied, magnetic and non-magnetized materials of 1ζ grade as listed in Table 1 were obtained.

Example 3 Copper-lead separation and flotation sedimentation (minus 625 mesh) of mine B concentrate having the grade shown in Table 3 was treated under the same conditions as Example 2, resulting in the grade shown in Table 3. Magnetic and non-magnetic materials were obtained.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing a typical example of a mineral beneficiation process using a sulfide mineral flotation method.

Claims (3)

[Claims] (1) In the beneficiation process in which copper concentrate, lead concentrate, zinc concentrate, etc. are separated and extracted by flotation of sulfide minerals, a magnetic separation process is inserted before or after flotation to convert bornite into a magnetic substance. A beneficiation method for sulfide minerals characterized by separate collection. (2) The ore beneficiation method according to claim 1, wherein the magnetic separation step is performed on the settled ore after Cu-Pb separation and flotation. (3) The magnetic separation process is carried out using a wet high magnetic force magnetic separator with a magnetic field strength of 10,000 Gauss or more.
or the ore beneficiation method described in paragraph 2.