CN111804439A - A kind of beneficiation method of carbon-containing lead-zinc sulfide ore - Google Patents

Abstract

The invention discloses a method for beneficiation of carbon-containing lead-zinc sulfide ore, belonging to the technical field of beneficiation, comprising the following steps: (1) grinding raw ore to obtain ore pulp of predetermined fineness; Add carbon inhibitor, stir evenly, and obtain ore pulp after sizing; (3) add collector and foaming agent to the sizing pulp to carry out lead flotation to obtain lead concentrate and lead flotation tailings; ( 4) Adding carbon inhibitor to lead flotation tailings to carry out zinc flotation to obtain zinc concentrate and tailings. The invention provides a beneficiation method for carbon-containing lead-zinc sulfide ore. The inhibitor used has a high selective inhibitory effect, which can efficiently selectively inhibit carbon-containing impurities in the flotation of lead sulfide and zinc, so as to facilitate the realization of high-efficiency enrichment of lead sulfide and zinc. Set recycling.

Description

A kind of beneficiation method of carbon-containing lead-zinc sulfide ore

technical field

The invention belongs to the technical field of beneficiation, and relates to a beneficiation method for carbon-containing sulfide lead-zinc ore.

Background technique

The lead-zinc sulfide ore contains various metals such as lead, zinc, copper, silver, sulfur and tin. The mine has large ore reserves and is mainly concentrated in Yunnan, Inner Mongolia, Gansu, Guangdong, Hunan and Guangxi. Its economic value is high, but the mineral The inlaid particle size is fine, and the carbon content in the gangue is high, which is a refractory ore.

The purpose of flotation is to separate useful minerals from gangue minerals, especially to selectively separate target minerals. In some carbonaceous gangue-type lead-zinc sulfide deposits, there are some carbonaceous materials with low density and strong natural floatability, which will enter the foam layer during the flotation process and affect the concentrate grade. In addition, these carbonaceous materials have a good adsorption effect, which will adsorb the flotation collectors in the pulp, resulting in an increase in the consumption of chemicals and an increase in production costs. Exploring and studying the efficient flotation method of lead-zinc sulfide ore is of great significance for promoting the progress of beneficiation technology of lead-zinc sulfide ore and improving the resource utilization level of carbon-containing lead-zinc sulfide ore.

SUMMARY OF THE INVENTION

In view of the technical problem of "it is difficult to suppress carbonaceous gangue minerals during flotation of sulfide lead-zinc ore" in the prior art, the object of the present invention is to provide a beneficiation method for carbon-containing sulfide lead-zinc ore, so as to realize the sulfide lead-zinc ore and separation of carbonaceous gangue.

The invention provides a beneficiation method for carbon-containing sulfide lead-zinc ore, comprising the following steps:

(1) Grinding the raw ore to obtain pulp with a predetermined fineness;

(2) adding a carbon inhibitor to the ore pulp after grinding, stirring evenly, to obtain the ore pulp after sizing;

(3) adding collector and foaming agent to the ore pulp after sizing to carry out lead flotation to obtain lead concentrate and lead flotation tailings;

(4) adding a carbon inhibitor to the lead flotation tailings to carry out zinc flotation to obtain zinc concentrate and tailings;

The structural formula of the carbon inhibitor is as follows:

Among them, R is an oxygen-containing hydrophilic group, and the value of n is 4-10.

In a preferred scheme, the number of C atoms on the R group is 0-2.

In a preferred scheme, R is any one of sulfonic acid group and carboxymethyl group.

A preferred scheme, the carbon inhibitor has one or more of the following structural formulas:

In the carbon inhibitor provided by the invention, nonylphenol is used as the carbon-philic group, and polyoxyethylene ether and sulfonic acid group/carboxymethyl group are used as the hydrophilic group. During the flotation of carbonaceous lead-zinc sulfide ores, the The use of the inhibitor can effectively inhibit the flotation of carbon, reduce the consumption of carbon impurities on the collector, reduce the carbon content in the concentrate product, and help improve the beneficiation index of the concentrate.

In a preferred solution, in step (1), the raw ore is ground to -0.074mm, accounting for more than 80%.

In a preferred scheme, in step (2), 50-150 g/t of carbon inhibitor and 3,000-4,000 g/t of lime are added, and stirred for 1-5 minutes to obtain slurried pulp.

In a more preferred solution, the amount of the carbon inhibitor used is 50-100 g/t.

In a preferred solution, in step (3), 50-60 g/t of mixed collector and 20-40 g/t of No. 2 oil are added to carry out lead rough separation, and lead concentrate is obtained by flotation of lead rough concentrate after two beneficiations, Lead flotation tailings are obtained after one sweep.

A more preferred solution adopts a mass ratio of ethyl thiazide: xanthate=1:1 as the mixed collector.

In a preferred solution, in step (4), 50-100 g/t carbon inhibitor, 500-1500 g/t lime, 100-200 g/t copper sulfate, and 10-30 g/t mixed collector are added to the lead flotation tailings , No. 2 oil 5 ~ 20g/t, after a roughing, two selection, a sweep to get zinc concentrate and tailings.

The "g/t" mentioned in the present invention refers to the addition amount of the agent relative to the raw ore. For example, the dosage of carbon inhibitor is 100g/t, which means that 100g of carbon inhibitor needs to be added to treat one ton of raw ore.

The carbon inhibitor designed in the present invention, the carbonaceous surface is mainly composed of aromatic rings, and the carbon-philic group of the inhibitor is the molecular large plane structure of nonylphenol, which can interact with the aromatic group on the carbonaceous surface in the gangue through π- The π stacking interaction attracts each other and is "anchored" on its surface; the nonylphenol-polyoxyethylene ether structure connects the sulfonic acid group/carboxymethyl group, so that when the whole molecule forms a micelle, a "hole group" will be formed spontaneously. The carbonaceous material is wrapped in the inner micelle layer or forms a hydrophilic chain covering the carbonaceous surface.

When the inhibitor is adsorbed on the carbonaceous surface, the ionization of the sulfonic acid group/carboxymethyl group in the inhibitor makes the carbonaceous particles negatively charged, forming a diffusion electric double layer around the particles. When two carbonaceous particles with the same charge approach each other, the electrostatic repulsion generated by the overlapping of the diffused electric double layer forces the charged carbonaceous particles to separate from each other, preventing them from merging and promoting the dispersion of carbonaceous in the slurry. In addition, the negative charge on the carbonaceous surface can also effectively hinder the adsorption of anionic collectors on the carbon surface through electrostatic repulsion, thereby enhancing the inhibition effect on carbonaceous particles.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention:

The invention provides a beneficiation method for carbon-containing lead-zinc sulfide ore, which adopts the hydrophilic polyoxyethylene ether and sulfonic acid group/carboxymethyl group in the carbon inhibitor structure, and when the surface of carbonaceous particles adsorbs such inhibitors Afterwards, the polyoxyethylene ether and the sulfonic acid group/carboxymethyl end will extend into the aqueous solution, thereby forming a hydrophilic three-dimensional adsorption layer with a certain thickness on the surface of the adsorbed carbonaceous particles. When the carbon particles are close to each other, the adsorption layers begin to overlap, that is, steric hindrance occurs between the carbonaceous particles. The carbon in the slurry solution is well dispersed. At the same time, due to this layer of stable solvated water film, it not only has great steric repulsion but also has strong hydrophilicity, which makes it more difficult for collectors to approach the carbonaceous surface. This not only ensures sufficient suppression of carbonaceous impurities, but also greatly reduces the consumption of collectors caused by carbonaceous adsorption.

The invention provides a method for beneficiation of carbon-containing lead-zinc sulfide ore. The inhibitor used has a high selective inhibitory effect, which can efficiently selectively inhibit carbon-containing impurities in the flotation of lead sulfide and zinc, so as to facilitate the realization of high-efficiency enrichment of lead sulfide and zinc. Set recycling.

Description of drawings

FIG. 1 is a process flow diagram of the flotation method in Embodiment 1 of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, ordinary skills in the art All other embodiments obtained by personnel without creative work fall within the protection scope of the present invention.

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Examples 1-3

A carbon-bearing lead-zinc ore in Inner Mongolia is used. The main metal minerals are sphalerite, galena and pyrite, of which the zinc grade is 5.28%, the lead grade is 2.23%, and the iron grade is 8.3%. The content of other metal minerals is lower. Gangue minerals are mainly dolomite, calcite and organic carbon. The carbon content in the ore reaches 4.75%. The nature of the ore is complex, the symbiotic relationship between lead and zinc is close, and the useful minerals lead, zinc and carbon are closely related, and the ore contains a lot of organic carbon. These carbonaceous materials have good floatability. If lead and zinc are directly flotated during the flotation process, the carbonaceous materials will inevitably enter the lead concentrate and zinc concentrate and affect the concentrate grade. Therefore, the key to solving the flotation of this ore is effective Separation of galena, sphalerite and organic carbon.

A kind of beneficiation method for carbon-containing sulfide lead-zinc ore of the present invention, as shown in Figure 1, comprises the following steps:

(1) Grinding: grinding the raw ore to a fineness of -0.074mm accounting for 85%;

(2) Sizing: adding carbon inhibitor 100g/t, lime 3500g/t, stirring for 3min, to obtain ore pulp after sizing;

(3) Lead flotation: add 55g/t mixed collector (ethyl sulfide: xanthate = 1:1) and No. 2 oil frother 30g/t for lead roughing; flotation of rough lead concentrate after two The lead concentrate is obtained by the second selection; the lead flotation tailings are obtained by the first sweep;

(4) Zinc flotation: add carbon inhibitor 50g/t, lime 1000g/t, copper sulfate 150g/t, mixed collector 20g/t, and No. 2 oil 10g/t to the lead flotation tailings after a rough separation , two selections and one sweep to obtain zinc concentrates and tailings.

Comparative Example 1

Using conventional iron-chromium salt lignin as carbon inhibitor, according to the above process and dosage of chemicals, the flotation results obtained by flotation test are listed in Table 1.

Table 1 Flotation results

It can be seen from Table 1 that compared with the use of conventional iron-chromium salt lignin, the grades and recovery rates of lead concentrate and zinc concentrate are higher. It can be seen that the use of this high-efficiency inhibitor can well suppress the floating of carbon, which is beneficial to lead sulfide. Flotation capture of zinc ore.

Claims (10)

1. The beneficiation method of the carbon-containing lead-zinc sulfide ore is characterized by comprising the following steps:

(1) grinding the raw ore to obtain ore pulp with preset fineness;

(2) adding a carbon inhibitor into the ore pulp after ore grinding, and uniformly stirring to obtain the ore pulp after size mixing;

(3) adding a collecting agent and a foaming agent into the pulp after size mixing to perform lead flotation to obtain lead concentrate and lead flotation tailings;

(4) adding a carbon inhibitor into the lead flotation tailings, and performing zinc flotation to obtain zinc concentrate and tailings;

the structural formula of the carbon inhibitor is as follows:

wherein R is an oxygen-containing hydrophilic group, and the value of n is 4-10.

2. The method for beneficiation of carbon-containing lead-zinc sulfide ores according to claim 1, wherein the number of C atoms in the R group is 0 to 2.

3. The method for beneficiation of carbon-containing lead-zinc sulfide ores according to claim 1, wherein R is any one of a sulfonic acid group and a carboxymethyl group.

4. The method for beneficiation of carbon-containing lead-zinc sulfide ores according to any one of claims 1 to 3, wherein the carbon inhibitor has one or more of the following structural formulas:

5. the method for beneficiating lead and zinc sulfide ores containing carbon according to claim 1, wherein in the step (1), the raw ores are ground to-0.074 mm which accounts for more than 80%.

6. The beneficiation method for the carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that in the step (2), 50-150 g/t of a carbon inhibitor and 3000-4000 g/t of lime are added and stirred for 1-5 min to obtain the pulp after size mixing.

7. The method for beneficiation of carbon-containing lead-zinc sulfide ores according to claim 6, wherein the amount of the carbon inhibitor is 50-100 g/t.

8. The beneficiation method for the carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that in the step (3), 50-60 g/t of mixed collecting agent and 20-40 g/t of No. 2 oil are added to perform lead roughing, lead concentrate is obtained by performing two times of fine concentration on the lead rough concentrate, and lead flotation tailings are obtained by performing one time of scavenging.

9. The beneficiation method for the carbon-containing lead-zinc sulfide ore according to claim 8, characterized by adopting the following components in mass ratio: xanthate 1:1 as mixed collector.

10. The beneficiation method for the carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that in the step (4), 50-100 g/t of a carbon inhibitor, 500-1500 g/t of lime, 100-200 g/t of copper sulfate, 10-30 g/t of a mixed collector and 5-20 g/t of No. 2 oil are added into lead flotation tailings, and zinc concentrate and tailings are obtained through once roughing, twice fine concentration and once scavenging.

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