CN115445779A - Reagent and method for selective flotation separation of molybdenite and galena - Google Patents

Abstract

The invention belongs to the field of mineral flotation, and particularly discloses a method for selectively flotation and separation of molybdenite and galena ₁ ‑X ₁ ‑CO‑C(X)‑CO‑X ₂ ‑R ₂ ) The flotation reagent is used for flotation, galena in the reagent is selectively inhibited, and concentrate enriched with molybdenite and tailings enriched with galena are obtained. The invention also provides a medicament for selective flotation separation of molybdenite and galena. The inhibitor can target the galena with high selectivityThe method does not use any collecting agent, dispersing agent or activating agent, effectively reduces the flotation cost, and can realize green and efficient flotation separation of Mo-Pb mixed sulfide ore only by adopting a simple medicament system (only containing the inhibitor and the foaming agent).

Description

Medicament and method for selective flotation separation of molybdenite and galena

Technical Field

The invention belongs to the field of mineral flotation, and particularly relates to the field of galena-molybdenite flotation separation.

Background

Molybdenum metal is mainly used in the steel industry, most of which is directly used for steel making or cast iron after industrial molybdenum oxide is briquetted, and a small part of which is used for steel making after being smelted into ferromolybdenum, and occupies a main position in the steel industry. Molybdenum is added into the stainless steel, so that the corrosion resistance of the steel can be improved; molybdenum is added into the cast iron, so that the strength and the wear resistance of the iron can be improved; the nickel-based superalloy containing 18% of molybdenum has the characteristics of high melting point, low density, small coefficient of thermal expansion and the like, and is used for manufacturing various high-temperature resistant parts for aviation and aerospace; molybdenum metal is widely used in electronic devices such as electron tubes, transistors and rectifiers (Baidu encyclopedia). Molybdenum is mainly derived from molybdenite (MoS) ₂ ) It is often associated with galena, sphalerite and chalcopyrite and other sulfide ores.

Lead metal is a corrosion-resistant heavy nonferrous metal material, has the advantages of low melting point, high corrosion resistance, good plasticity, difficult penetration of X rays, gamma rays and the like, and is widely applied to industrial departments (hundred-degree encyclopedia) of chemical industry, cables, storage batteries, radioactivity protection and the like. The galena (PbS) is the most important mineral raw material for extracting lead, and the galena is also the lead mineral with the widest distribution, so that the efficient utilization of the galena resource is the key for ensuring the stable development of the lead metal related industries in China.

The molybdenite and the galena both have excellent natural floatability, the traditional collecting agent is difficult to realize the high-efficiency separation of the molybdenite and the galena, the Mo-Pb sulphide ore separation still needs an inhibitor (usually sulfide), but the use process of the conventional inhibitor can cause harm to the surrounding environment. Therefore, the development of a novel inhibitor for Mo — Pb sulfide ore system that is highly efficient and green is still of great significance. The proper inhibitor can enrich galena in the tailings while obtaining a high-grade molybdenite concentrate product, so that a high-grade galena tailing product is obtained, and efficient utilization of two kinds of sulfide ores is realized.

Disclosure of Invention

Aiming at the problems that molybdenite and galena have excellent natural floatability and can be separated from selective flotation, the invention provides a method for selective flotation and separation of molybdenite and galena, and aims to selectively and targetedly inhibit the galena by utilizing a special inhibitor so as to realize the method for high-selective separation of the molybdenite and the galena.

It is a second object of the present invention to provide a flotation reagent for selectively separating molybdenite and galena, which comprises the inhibitor of formula 1.

Molybdenite and galena are often associated and have good natural floatability, and under the condition that only foaming agents are added to the molybdenite and the galena, the recovery rates are respectively as high as 97 percent and 69 percent. The existing flotation separation method cannot give consideration to selectivity, cost and environmental protection to a mixed system of the two, so the invention provides the following technical scheme:

a method for selectively floating and separating molybdenite and galena comprises the steps of carrying out flotation on minerals to be selected containing the molybdenite and the galena in a flotation reagent containing an inhibitor shown in a formula 1, selectively inhibiting the galena in the minerals to obtain concentrate enriched with the molybdenite and tailings enriched with the galena;

R ₁ -X ₁ -CO-C(X)-CO-X ₂ -R ₂

formula 1

Said R ₁ 、R ₂ Independently H, C ₁ -C ₃ Alkyl, amino, alkenyl, alkynyl, carboxyl, hydroxyl, substituted alkyl;

the substituted alkyl is at C ₁ -C ₃ The saturated carbon chain of (2) has an alkyl group with a substituent, wherein the substituent is at least one of hydroxyl, amino, cyano, alkenyl, alkynyl, carboxylic acid group, amide group, ester group and ether group;

said X ₁ 、X ₂ Independently O, NH, S or PH;

x is H ₂ Or O;

in the formula 1, the total number of carbon atoms is 3 to 10, and the total number of hetero atoms is 2 or more.

The invention innovatively uses the compound shown in the formula 1 as an inhibitor of galena, and the inhibitor can be used for highly selectively inhibiting the galena in a targeted manner based on intramolecular synergy, so that the natural floatation of the galena is influenced, and in addition, molybdenite is not basically inhibited. Thus, based on the target inhibition effect of the formula 1, the high-selectivity separation of galena and molybdenite can be realized, and two target minerals can be obtained.

In the invention, the control of the structure and the group shown in the formula 1 is the key for synergistically improving the selective targeted inhibition of galena. Further research of the invention finds that the molecular weight and the proportion of the heteroatom of the control formula 1 are beneficial to unexpectedly further improving the target inhibition selectivity of galena.

In the present invention, in the substituent, the alkyl group is, for example, a straight-chain alkyl group or a branched-chain alkyl group. The cycloalkyl group is preferably a monocyclic cycloalkyl group having three carbon numbers. In the present invention, the substituted alkyl group is a group having a substituent on the carbon chain of the alkyl group, preferably C ₁ ～C ₂ The alkyl group of (1) may have a substituent such as a hydroxyl group, a carboxyl group, an amino group, etc., and for example, the substituted alkyl group may be a hydroxyethyl group, a carboxyethyl group, etc.

In the present invention, when X1 and X2 are carbon, R1 and R2 may be a group such as H, hydroxyl, amino, ester, alkenyl, etc., and when X1 and X2 are a hetero element, R1 and R2 may be a group such as H, alkyl, substituted alkyl, etc. In the invention, the hetero elements are O, N, S and P.

Preferably, in the formula 1, X is ₁ 、X ₂ Independently, is O or NH.

Preferably, R is ₁ ～R ₂ Wherein at least one of the substituents contains a substituent of O or N; preferably, R ₁ ～R ₂ Less than or equal to 4; preferably H, methyl, hydroxy, hydroxymethyl, ethyl or hydroxyethyl.

Preferably, the total carbon number is from 3 to 7; and the total number of the hetero atoms is 3 to 5; and the number of hetero atoms and the ratio of carbon numbers are greater than or equal to 0.7. The research of the invention finds that the preferable formula 1 can further improve the inhibition selectivity of the inhibitor to galena and is beneficial to further improving the separation selectivity of the galena and the molybdenite.

Preferably, the inhibitor of formula 1 is at least one compound of formula a, formula B, formula C or formula D;

in the formula A and the formula B, R is ₁ 、R ₂ Independently H, methyl, ethyl, hydroxymethyl, or hydroxyethyl;

in the formula C, R is ₁ 、R ₂ Independently methyl, ethyl, hydroxymethyl or hydroxyethyl;

in the formula D, R is ₁ 、R ₂ Independently H, hydroxy, hydroxymethyl or hydroxyethyl;

in the present invention, the inhibitor is more preferably represented by formula C and/or formula D. The research of the invention unexpectedly finds that the preferable formula C and the preferable formula D have better galena targeting inhibition effect and are beneficial to further synergistically improving the separation selectivity of the galena and the molybdenite.

Preferably, the concentration of the inhibitor of formula 1 in the ore pulp for flotation is not less than (greater than or equal to) 1X 10 ^{- 4} mol/L; preferably not less than 2X 10 ^-4 mol/L; go toThe step is preferably 2X 10 ^-4 mol/L～1×10 ^-3 mol/L, the inhibitor is more preferably 2X 10 in view of cost and effect ^-4 mol/L～5×10 ^-4 mol/L。

In the invention, under the action of the inhibitor shown in the formula 1, the target inhibition selectivity of galena can be further improved by further matching with the control of pH. Preferably, the pH of the flotation stage is in the range of 2 to 10, preferably 2 to 7. The pH of the flotation stage is preferably 4 to 7 in view of industrial value.

In the present invention, a good galena-molybdenite selective separation effect can be obtained by means of the selective targeting inhibition effect of formula 1 on galena, and it is preferable that a foaming agent is further added in the flotation stage in view of process efficiency.

The foaming agent may be a material having a foaming component well known in the industry, for example, the foaming agent is at least one of terpineol, methyl phenolic acid, heavy pyridine, methyl isobutyl carbinol, eucalyptus oil, camphor oil, higher alcohols and synthetic foaming agents;

in the present invention, the amount of the foaming agent can be adjusted according to the flotation foam requirement, for example, the amount of the foaming agent in the flotation agent is 1X 10 ^-6 mol/L～1×10 ^-4 mol/L, which may be further 1X 10 in view of treatment cost ^{- 6} mol/L～5×10 ^-6 mol/L。

In the present invention, the flotation system does not contain at least one of a collector, a dispersant and an activator.

In the invention, the mineral to be selected can be Mo-Pb sulphide ore.

The invention also provides a flotation reagent for selectively separating the molybdenite and the galena, which comprises the inhibitor shown in the formula 1 and a foaming agent.

Preferably, the flotation reagent is composed of the inhibitor of formula 1 and a foaming agent. The flotation reagent according to the present invention does not contain at least one of a collector, a dispersant and an activator.

Advantageous effects

1. In a system of galena and molybdenite, the inhibitor shown in the formula 1 can unexpectedly and highly selectively target and inhibit the galena, and basically does not affect the molybdenite, so that the selective separation of the molybdenite and the galena can be effectively realized by virtue of the action of the inhibitor shown in the formula 1.

2. The method provided by the invention has the advantages that the conditions are mixed, the excellent separation selectivity can be obtained unexpectedly without collecting agents, dispersing agents, active agents and other components in the flotation stage, the cost is lower, the residual quantity of the flotation agents is less, and the method has great industrial application value.

Drawings

FIG. 1 is a flotation scheme used in the examples;

FIG. 2 is a graph of recovery data for example 1;

FIG. 3 is a graph of recovery data for example 2.

FIG. 4 is a graph of recovery data for example 3.

Detailed Description

The effect of the present invention is illustrated by taking single minerals of lead ore and molybdenite and binary mixed sulfide ore (1. The following cases, except where specifically stated, the composition of the minerals employed are shown in table 1:

table 1 raw grade of single minerals of galena and molybdenite and binary mixed sulfide ore of both (1

Note that: and mixing the raw lead ore and the molybdenite in a weight ratio of 1.

Example 1

In order to verify the separation effect of the inhibitor of the embodiment on single minerals of galena and molybdenite, the galena and molybdenite with high purity (the grades are shown in table 1) are adopted, the process shown in fig. 1 is adopted, and the inhibitor of the embodiment is used for inhibiting different sulfide ores and only inhibiting the sulfide oresAdding foaming agent to perform flotation separation process with the same parameters for each case, wherein the foaming agent is terpineol, and the concentration of the foaming agent is 2 × 10 ^-6 mol/L, only different in the kinds of the flotation sulfide ores, thereby comparing the flotation and separation effects of the depressants in the case.

The flotation reagent of the invention: the inhibitor is:

(formula 1; amount shown in Table 2), the foaming agent is terpineol (concentration 2X 10) ^-6 mol/L)。

The process shown in FIG. 1 is adopted, and the specific operations are as follows: dry grinding pure mineral ore (with the particle size of 3-0.5 mm) for 15min (the particle size after grinding is 0.0740-0.0374mm, dry grinding is carried out by adopting a horizontal ball mill, the grinding concentration is 35-40%), weighing 2g of ground single mineral sample (molybdenite or galena) in each group, pouring the weighed single mineral sample into a 40mL flotation tank, adding 35mL of deionized water, adding the flotation reagent in the example, supplementing a proper amount of deionized water, stirring for 3min, adding terpineol (the concentration in ore pulp is controlled to be 2 x 10) ^-6 mol/L), stirring for 3min, starting to scrape bubbles, scraping the bubbles for 3min, scraping the concentrate to a concentrate basin along with foams, leaving tailings in a flotation tank, filtering and drying the concentrate and the tailings, then respectively weighing, calculating the recovery rate, carrying out three parallel groups of experiments in each group, taking the average value and calculating the error (variance), and showing the error bars in the graph.

Fig. 2 and table 2 show the recovery of galena and molybdenite pure minerals at different dosages of reagents for example 1. (in the case, the depressor is used as the depressor, the terpineol is used as the foaming agent, other flotation reagents are not added, and the pH value of ore pulp is 7).

As can be seen from the results of fig. 2 and table 2, in the range of the dosage of the tested chemicals, as the dosage of the inhibitor of the present invention increases, the inhibition capability of the flotation chemicals of the present example on galena gradually increases, and there is almost no inhibition effect on the flotation of molybdenite, which means that the flotation inhibitors of the present example can selectively inhibit galena with high efficiency at low dosage of the chemicals, and realize high-efficiency flotation separation of Mo-Pb mixed sulfide ore.

Table 2 flotation results of example 1

Example 2

Through flotation experiments under different solution pH values, the influence of the pulp pH value on the flotation separation of galena and molybdenite by the inhibitor is researched.

The flotation reagent of the invention: the inhibitor is:

(formula 1; in an amount of 5X 10) ^-4 mol/L), the foaming agent is terpineol (the concentration is 2 multiplied by 10) ^-6 mol/L)。

High-purity galena and molybdenite pure minerals (the grade is shown in table 1) are adopted. By adopting the flow shown in FIG. 1, the flotation process parameters are the same, and the difference is only that different types of sulfide ore monominerals and different pulp pH values are adopted, so that the flotation inhibition effect of the inhibitor on the monophyletic ore and molybdenite monominerals under different pH values is compared.

The process shown in FIG. 1 is adopted, and the specific operations are as follows: dry-grinding pure mineral ore (with particle size of 3-0.5 mm) for 15min (with particle size of 0.0740-0.0374mm after grinding), and dry-grinding with horizontal ball mill to obtain medium filling rate of 30-40%. Weighing 2g of ground single mineral sample in each group, pouring the single mineral sample into a 40mL flotation tank, adding 35mL deionized water, and adding a flotation reagent, wherein the dosage of inhibitors in the ore pulp is 5 multiplied by 10 ^-4 Adding appropriate amount of deionized water, stirring for 3min, adding pH regulator (sulfuric acid or sodium hydroxide) to adjust the flotation system to specific pH, stirring for 3min, adding terpineol (concentration of 2 × 10) ^-6 mol/L), stirring for 3min, starting to scrape bubbles, scraping the bubbles for 3min, scraping the concentrate to a concentrate basin along with foams, leaving tailings in a flotation tank, filtering and drying the concentrate and the tailings, then weighing the concentrate and the tailings respectively, and calculating the recovery rate.

The pH gradient set for the experiment was: 2,4,6,7,8, 10, 12.

Figure 3 shows the recovery of galena and molybdenite pure minerals of example 2 at different pH. (in this case, the concentration of the inhibitor is 5X 10) ^-4 mol/L; the pH regulator is sodium hydroxide solution and sulfuric acid solution; the foaming agent is terpineol with concentration of 2 × 10 ^{- 6} mol/L)。

Table 3 flotation results of example 2

It can be seen from example 2 that the selective inhibition effect of the inhibitor of the present invention on galena is very excellent when the pH =2-7, and in this pH range, the recovery rate of galena after inhibition by the inhibitor of the present invention is less than 20%, while the recovery rate of molybdenite by the inhibitor of the present invention has almost no inhibition effect, the recovery rate of molybdenite is more than 90% in the pH =2-7 range, and the flotation recovery rate difference between molybdenite and galena is not less than 75% in the pH =2-7 range.

The results prove that the inhibitor, the flotation reagent and the separation method have excellent effects, and can realize the high-efficiency and high-selectivity separation of galena and molybdenite. The selective inhibitor or the flotation reagent or the collector-free flotation separation method can realize the high-efficiency separation of Mo-Pb sulphide ore under a wider ore pulp pH (pH = 2-10). When the pH of the flotation pulp is =2-7, high-grade molybdenite concentrate can be obtained, and the directional high-efficiency inhibition of galena can be realized. In consideration of the subsequent treatment of the beneficiation wastewater, the preferable pulp pH condition is pH =4 to 7, and further preferably pH =7.

Example 3

In order to verify the separation effect of the flotation reagent in the case of the mixed sulphide ore of galena and molybdeniteWe used high purity galena and molybdenite pure minerals (grades as in table 1) at a ratio of 1:1 weight ratio to obtain Mo-Pb mixed sulfide ore, and adopting the flow shown in figure 1. The inhibitor concentration of the present case is 5X 10 ^-4 mol/L and pH is 4-7.

The flotation reagent of the invention: the inhibitor is:

(formula 1; in an amount of 5X 10) ^-4 mol/L) and the foaming agent is terpineol (the concentration is 2 multiplied by 10) ^-6 mol/L), flotation pulp pH =4-7.

The specific operation is as follows: dry grinding pure mineral ore (particle size of 3-0.5 mm) for 15min (particle size of 0.0740-0.0374mm after grinding, dry grinding by adopting a horizontal ball mill, and medium filling rate of 30-40%), weighing 2g of mixed ore samples which are ground and uniformly mixed according to a proportion in each group, pouring the 2g of mixed ore samples into a 40mL flotation tank, adding 35mL of deionized water, adding the inhibitor of the invention, supplementing a proper amount of deionized water, wherein the concentration of the inhibitor is 5 multiplied by 10 ^-4 mol/L, wherein the pH value of ore pulp is 4/10; stirring for 3min, adding terpineol (concentration of 2 × 10) ^-6 mol/L), stirring for 3min, starting foam scraping, performing foam scraping for 3min, scraping the concentrate to a concentrate basin along with foam, leaving tailings in a flotation tank, filtering and drying the concentrate and the tailings, then weighing the concentrate and the tailings respectively, detecting the grade of the concentrate and calculating the recovery rate.

The specific mixing proportion of the Mo-Pb mixed sulfide ore in the example of the series of cases is as follows:

this case of Mo-Pb mixed sulphide ore: 1g of galena and 1g of molybdenite are stirred for 5min at room temperature, so that the minerals are fully and uniformly mixed for use.

The grade in the present case of Mo-Pb mixed sulphide ore is shown in Table 1.

Figure 4 and table 4 show the recovery of each mineral and the grade of the corresponding metal in the flotation concentrate product of the mixed ore minerals of example 3 at a pulp pH of 4-7.

Table 4 flotation results of example 3 (pulp pH 4-7)

As can be seen from the results of FIG. 4 and Table 4, when the concentration of the inhibitor was 5X 10 ^-4 When the concentration is mol/L, the flotation reagent has excellent separation effect on Mo-Pb mixed sulfide ore when the pH value of ore pulp is 4-7.

Under the condition that the pH =4-7, the inhibiting ability of the inhibitor and the flotation reagent on galena in the Mo-Pb mixed sulfide ore is far stronger than the inhibiting effect on molybdenite (the recovery rate is higher than 87%, and the grade is higher than 53%). According to the flotation result, the flotation agent provided by the invention obviously improves the flotation separation effect of galena and molybdenite, the grade of useful ore molybdenite is obviously improved, and galena concentrate is also enriched in tailings.

Example 4

In order to verify the influence of the regulation substituent group in the inhibitor structure on the galena selective inhibition effect, the following compounds (inhibitors a to h) with different structures are selected as the inhibitor, and the galena and molybdenite pure minerals with high purity (the grade is shown in table 1) are still adopted according to the proportion of 1:1 proportion to obtain Mo-Pb mixed sulfide ore, and adopting the flow shown in figure 1.

Flotation reagent: the following inhibitors (all concentrations in the pulp are 5X 10) ^-4 mol/L) and frother (concentration in pulp is 2X 10) ^-6 mol/L)；

Experimental group 1: inhibitor a:

experimental group 2: inhibitor b:

experimental group 3: and (3) inhibitor c:

experimental group 4: inhibitor d:

experimental group 5: inhibitor e:

comparative group 1: an inhibitor f:

comparative group 2: inhibitor g:

comparative group 3: inhibitor h starch

Inhibitor concentration of each group is 5X 10 ^-4 mol/L terpineol as foaming agent (concentration of 2X 10) ^-6 mol/L), flotation pulp pH =7.

The specific operation is as follows: dry grinding pure mineral ore (particle size of 3mm-0.5 mm) for 15min (particle size of 0.0740-0.0374mm after grinding, dry grinding by adopting a horizontal ball mill, and medium filling rate of 30-40%), weighing 2g of mixed ore samples which are ground well and uniformly mixed according to a proportion in each group, pouring the 2g of mixed ore samples into a 40mL flotation tank, adding 35mL of deionized water, adding the flotation reagent, supplementing a proper amount of deionized water, and adding the inhibitor with concentration of 5 multiplied by 10 for all ^-4 mol/L, pH of ore pulp is 7; stirring for 3min, adding terpineol (concentration of 2 × 10) ^-6 mol/L), stirring for 3min, starting foam scraping, performing foam scraping for 3min, scraping the concentrate to a concentrate basin along with foam, leaving tailings in a flotation tank, filtering and drying the concentrate and the tailings, then weighing the concentrate and the tailings respectively, detecting the grade of the concentrate and calculating the recovery rate.

This case of Mo-Pb mixed sulphide ore: 1.0g of galena and 1.0g of molybdenite are stirred for 5min at room temperature, so that the minerals are fully and uniformly mixed for use;

the grade of the Mo-Pb mixed sulfide ore of this case is shown in Table 1.

Table 5 flotation results of example 4 (pulp pH 7)

Table 5 shows that the inhibitor having the structure of the present invention can achieve synergy based on the structure and the combined control of the number of carbon atoms and the number of heteroatoms, can significantly improve the targeted inhibition selectivity of galena, and can unexpectedly achieve selective separation of galena and molybdenite. Researches also find that the separation selectivity of galena and molybdenite can be greatly reduced without controlling the structure, the carbon number of the group and the proportion of carbon and hetero elements.

Claims (10)

1. A method for selectively floating and separating molybdenite and galena is characterized in that a mineral to be selected containing the molybdenite and the galena is floated in a floating agent containing an inhibitor shown in a formula 1, the galena in the galena is selectively inhibited, and concentrate enriched with the molybdenite and tailings enriched with the galena are obtained;

R ₁ -X ₁ -CO-C(X)-CO-X ₂ -R ₂

formula 1

R is as described ₁ 、R ₂ Independently H, C ₁ -C ₃ Alkyl, amino, alkenyl, alkynyl, carboxyl, hydroxyl, substituted alkyl;

the substituted alkyl is at C ₁ -C ₃ The saturated carbon chain of (2) has an alkyl group with a substituent, wherein the substituent is at least one of hydroxyl, amino, cyano, alkenyl, alkynyl, carboxylic acid group, amide group, ester group and ether group;

said X ₁ 、X ₂ Independently O, NH, S or PH;

x is H ₂ Or O;

in the formula 1, the total number of carbon atoms is 3 to 10, and the total number of hetero atoms is 2 or more.

2. The method for selective flotation separation of molybdenite and galena according to claim 1, wherein in formula 1, X is ₁ 、X ₂ Independently is O or NH;

preferably, R is ₁ ～R ₂ Wherein at least one of the substituents contains a substituent of O or N.

3. The selective flotation separation method of molybdenite and galena as claimed in claim 2, wherein in formula 1, total carbon number is 3 to 7; and the total number of the hetero atoms is 3 to 5; and the ratio of the number of hetero atoms to the number of carbon atoms is 0.7 or more.

4. The process for selective flotation separation of molybdenite and galena according to any one of claims 1 to 3, wherein the inhibitor of formula 1 is at least one compound having formula A, formula B, formula C or formula D;

in the formula A and the formula B, R is ₁ 、R ₂ Independently H, methyl, ethyl, hydroxymethyl, or hydroxyethyl;

in the formula C, R is ₁ 、R ₂ Independently is methyl, ethyl, hydroxymethyl or hydroxyethyl;

in the formula D, R is ₁ 、R ₂ Independently H, hydroxy, hydroxymethyl or hydroxyethyl.

5. The selective flotation separation process for molybdenite and galena according to any one of claims 1 to 4, wherein the concentration of the inhibitor of formula 1 in the slurry for flotation is not less than 1 x 10 ^-4 mol/L; preferably not less than 2X 10 ^{- 4} mol/L; more preferably 2X 10 ^-4 mol/L～1×10 ^-3 mol/L, most preferably 2X 10 ^-4 mol/L～5×10 ^-4 mol/L。

6. The process for the selective flotation separation of molybdenite and galena according to any one of claims 1 to 5, wherein the pH of the flotation stage is between 2 and 10, preferably between 2 and 7.

7. The method for selective flotation separation of molybdenite and galena according to any one of claims 1 to 6, wherein a foaming agent is further added in the flotation stage;

preferably, the foaming agent is at least one of terpineol, methyl phenolic acid, heavy pyridine, methyl isobutyl carbinol, eucalyptus oil, camphor oil, higher alcohols and synthetic foaming agent;

preferably, the amount of frother used in the flotation agent is 1 × 10 ^-6 mol/L～1×10 ^-4 mol/L。

8. The method for selective flotation separation of molybdenite and galena according to any one of claims 1 to 7, wherein the flotation system does not include at least one of a collector, a dispersant and an activator.

9. A flotation reagent for selectively separating the molybdenite and galena, comprising the inhibitor of formula 1 according to any one of claims 1 to 8, and further comprising a foaming agent.

10. The flotation reagent for selectively sorting molybdenite and galena as claimed in claim 9, consisting of said depressant of formula 1 and frother.

Images