A flotation recovery system for sulfide minerals in cyanide tailings

Abstract

The invention discloses a flotation recovery system for sulfide minerals in cyanide tailings, belongs to the technical field of cyanide tailings treatment, and solves the problem that sulfide minerals in cyanide tailings in the prior art are difficult to recycle. It includes a doser and a reagent pre-mixed reaction stirring barrel; the doser includes an organic polyamine doser and a metal ion doser; the organic polyamine doser and the metal ion doser are respectively connected to the reagent pre-mixed reaction stirring barrel; the metal ion doser is used to add metal ions to the reagent pre-mixed reaction stirring barrel, and the organic polyamine doser is used to add organic polyamines to the reagent pre-mixed reaction stirring barrel, and the metal ions and organic polyamines can react in the reagent pre-mixed reaction stirring barrel to generate organic polyamine-metal ion complexes. The flotation recovery system of the present invention can effectively realize the recycling of sulfide minerals in cyanide tailings.

Description

Technical Field

[0001] The invention belongs to the technical field of cyanidation tailings treatment, and in particular relates to a flotation recovery system for sulfide minerals in cyanidation tailings. Background Art

[0002] Cyanidation is the main method of gold extraction. Cyanidation has the advantages of low cost, mature technology, and high adaptability to ores. Since the cyanidation method was applied to gold production in the 1880s, it has gradually become the main method for extracting gold and silver from gold ore. At present, more than 80% of the companies in my country use cyanidation to extract gold. Cyanidation tailings are waste tailings produced in the cyanidation process. With the rapid development of my country's gold industry, my country's gold smelting companies will discharge a large amount of cyanidation tailings every year. According to incomplete statistics, in recent years, the annual cyanidation tailings discharged by my country's gold smelting companies have been more than 20 million tons.

[0003] Cyanide tailings often contain a lot of sulfide minerals. Sulfide minerals are mainly pyrite, followed by chalcopyrite, galena, sphalerite, etc. Flotation is the main method for recovering sulfide minerals, but sulfide minerals in cyanide tailings are difficult to enrich through flotation processes. This is mainly because the surface properties of sulfide minerals change significantly under the long-term action of cyanide, making them difficult to activate, and the difference in floatability between minerals is significantly reduced. In the current cyanide tailings treatment system, xanthate collectors are mostly used to directly add to the mixing barrel to treat cyanide tailings. However, since sulfide minerals are deeply suppressed by cyanide during cyanide gold extraction operations, xanthate is difficult to adsorb on the surface of sulfide minerals, resulting in poor flotation of sulfide minerals. Therefore, under current technical conditions, sulfide minerals in cyanide tailings are difficult to be effectively recovered and utilized. Therefore, it is urgent to provide a system for effectively recovering sulfide minerals in cyanide tailings. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a flotation recovery system for sulfide minerals in cyanide tailings, so as to solve the problem that sulfide minerals in cyanide tailings are difficult to recycle.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The invention provides a flotation recovery system for sulfide minerals in cyanide tailings, comprising a doser and a reagent premixing reaction stirring barrel; the doser comprises an organic polyamine doser and a metal ion doser; the organic polyamine doser and the metal ion doser are respectively connected with the reagent premixing reaction stirring barrel; the metal ion doser is used for adding metal ions into the reagent premixing reaction stirring barrel, and the organic polyamine doser is used for adding organic polyamine into the reagent premixing reaction stirring barrel, and the metal ions and the organic polyamine can react in the reagent premixing reaction stirring barrel to generate an organic polyamine-metal ion complex.

[0007] Furthermore, it also includes a slurry stirring barrel and a flotation device; the reagent pre-mixing reaction stirring barrel is connected to the slurry stirring barrel, the organic polyamine-metal ion complex in the reagent pre-mixing reaction stirring barrel is added to the slurry stirring barrel to form a mixed slurry, and the organic polyamine-metal ion complex is used to activate and modify the sulfide minerals in the cyanide tailings slurry in the slurry stirring barrel; the bottom of the slurry stirring barrel is connected to the flotation device, and the mixed slurry in the slurry stirring barrel is introduced into the flotation device for ventilation flotation.

[0008] Furthermore, a peristaltic pump is provided between the reagent pre-mixing reaction stirring barrel and the slurry stirring barrel; and a slurry pump is provided between the slurry stirring barrel and the flotation equipment.

[0009] Further, the flotation device includes one or more flotation columns and / or flotation machines.

[0010] Furthermore, the main components of cyanide tailings include: sulfide minerals and gangue minerals.

[0011] Furthermore, the method for using the flotation recovery system for sulfide minerals in the cyanide tailings is as follows:

[0012] Step 1: using a metal ion doser and an organic polyamine doser respectively, adding metal ions and organic polyamines into a pre-mixed reaction stirring tank containing water, and stirring the reaction to obtain a reaction product which is a solution containing an organic polyamine-metal ion complex;

[0013] Step 2: In a slurry mixing tank, the cyanide tailings are prepared into a slurry with a mass concentration of 20%-45%, and the slurry is adjusted to a pH of 7.0-9.0;

[0014] Step 3: using a peristaltic pump to add the reaction product of step 1 to the slurry of step 2, stirring and reacting to obtain a mixed slurry;

[0015] Step 4: Use a slurry pump to pass the mixed slurry into the flotation equipment for aeration flotation to obtain the floated sulfide minerals.

[0016] Furthermore, the organic polyamine in step 1 is a hydrophobic organic polyamine, and the hydrophobic organic polyamine has the following characteristics:

[0017] The molecular structure contains more than two NH 2 and / or —NH— structure;

[0018] The molecular structure also contains a hydrophobic structure, which includes an aromatic group or a C4-C20 alkyl group.

[0019] Furthermore, the hydrophobic organic polyamine is an alkyl polyamine ether.

[0020] Furthermore, in step 1, the molar ratio of the hydrophobic organic polyamine to the metal ion is 1-3:1.

[0021] Furthermore, in step 3, the amount of the reaction product added is 80-200 g / t 矿 .

[0022] Compared with the prior art, the present invention can achieve at least one of the following technical effects:

[0023] (1) The flotation recovery system of the present invention is provided with a reagent pre-mixing reaction stirring tank, Fe 2+ or Cu + Ions and hydrophobic organic polyamines are first introduced into a reagent pre-mixing reaction stirring barrel, where they are fully mixed and reacted. The reaction products are then introduced into a slurry stirring barrel for slurry adjustment. This avoids the interference of the complex environment in the slurry on the reaction between reagents and increases the efficiency of the flotation reagents.

[0024] (2) The reagent pre-mixing reaction stirring barrel, slurry stirring barrel and flotation equipment of the flotation system of the present invention are arranged in a modular manner, which is convenient for combination and adjustment according to the actual production of different mines; a reasonable flotation process is designed to achieve efficient recovery of sulfide minerals. The system has the characteristics of less equipment, short process, low operating cost, less maintenance difficulty and less investment.

[0025] (3) When the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings, metal ions and organic polyamines react in a pre-mixed reaction stirring tank to produce a flotation agent organic polyamine-metal ion complex that can be selectively adsorbed on the surface of sulfide minerals, without generating any hazardous products. In addition, the agent can also precipitate residual cyanide in the original cyanide tailings, thereby eliminating the original safety hazards of the cyanide tailings and having high environmental friendliness.

[0026] (4) When the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings, the hydrophobic organic polyamine-metal ion complex produced by the mixed reaction of metal ions and hydrophobic organic polyamines can react with the metal cyanide on the surface of the sulfide mineral to form a hydrophobic organic polyamine-metal ion-metal cyanide complex on the surface of the mineral, thereby selectively adsorbing on the surface of the sulfide mineral, eliminating the inhibitory effect of cyanide on the flotation of sulfide minerals; and one end of the hydrophobic group faces the solution, making the mineral surface hydrophobic, and realizing the flotation separation of sulfide minerals and gangue minerals during the flotation process. The sulfur grade and recovery rate of the sulfide minerals obtained when the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings are both high. In addition, the flotation agent can also react with the residual cyanide in the ore pulp to form a precipitate, eliminating the interference of residual cyanide on the flotation of sulfide minerals and solving its harm to the environment.

[0027] (5) When the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings, the ammonia / amine-metal ion end of the universal organic polyamine-metal ion complex can also be used to react with the cyanide component on the surface of the sulfide mineral to form an organic polyamine-metal ion-cyanide complex on the mineral surface, thereby selectively adsorbing on the surface of the sulfide mineral, eliminating the inhibitory effect of cyanide on the flotation of the sulfide mineral; then, by adding a xanthate collector to make the surface of the sulfide mineral hydrophobic, the flotation separation of the sulfide mineral and the gangue mineral is achieved during the flotation process. The sulfur grade and recovery rate of the sulfide mineral obtained by the method of the present invention are both high.

[0028] Other features and advantages of the present invention will be described in the following description, and part of them may become obvious from the description, or may be understood by practicing the present invention. The purpose and other advantages of the present invention may be realized and obtained by the contents particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference numerals refer to like components throughout the drawings.

[0030] Figure 1 It is a schematic diagram of the overall structure of the flotation recovery system of the present invention;

[0031] Figure 2 It is a schematic diagram of the overall structure of the flotation device of the present invention;

[0032] Figure 3 is one of the structural formulas of the hydrophobic organic polyamine of the present invention;

[0033] Figure 4 is the second structural formula of the hydrophobic organic polyamine of the present invention;

[0034] Figure 5 It is the structural formula 3 of the hydrophobic organic polyamine of the present invention;

[0035] Figure 6 This is a schematic diagram of the process flow of Example 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of the process flow of Example 3 of the present invention;

[0037] Figure 8 This is a schematic diagram of the process flow of Example 4 of the present invention.

[0038] Reference numerals:

[0039] 1-dosing device, 2-pre-mixing reaction stirring barrel, 3-peristaltic pump, 4-slurry stirring barrel, 5-slurry pump, 6-flotation equipment, 7-overflow port, 8-underflow port, 9-feeding port, 10-bubble generator. DETAILED DESCRIPTION

[0040] A flotation recovery system for sulfide minerals in cyanide tailings is further described in detail below in conjunction with specific examples. These examples are only used for comparison and explanation purposes, and the present invention is not limited to these examples.

[0041] At present, "flotation of gold-containing sulfide ores-cyanide leaching" is the main process of cyanide production in my country. After flotation, the sulfur content in the concentrate is enriched to between 10% and 35%, which leads to the fact that the cyanide tailings often contain a lot of sulfide minerals. The sulfide minerals are mainly pyrite, followed by chalcopyrite, galena, sphalerite, etc. Flotation is the main method for recovering sulfide minerals, but the sulfide minerals in the cyanide tailings are difficult to enrich through flotation technology. This is mainly because the surface properties of sulfide minerals change significantly under the long-term action of cyanide, making them difficult to be activated, and the difference in floatability between minerals is significantly reduced. Therefore, under current technical conditions, the sulfide minerals in the cyanide tailings are difficult to be effectively recovered and utilized. Therefore, after in-depth research, the inventors have proposed a novel flotation recovery system for sulfide minerals in cyanide tailings. The flotation recovery system for sulfide minerals in cyanide tailings of the present invention can pre-mix and react hydrophobic organic polyamines and metal ions to generate an activator for sulfide ore flotation. The activator eliminates the interference of cyanide on the adsorption of the collector on the mineral surface by reacting with the cyanide-containing components exposed on the surface of the sulfide ore. In addition, since the activator has a hydrophobic structure, it can improve the floatability of the sulfide minerals, thereby realizing the effective flotation of the sulfide minerals in the cyanide tailings.

[0042] The invention provides a flotation recovery system for sulfide minerals in cyanide tailings, comprising a doser 1 and a reagent premixing reaction stirring barrel 2; the doser 1 comprises an organic polyamine doser and a metal ion doser; the organic polyamine doser and the metal ion doser are respectively connected to the reagent premixing reaction stirring barrel 2; the metal ion doser is used to add metal ions to the reagent premixing reaction stirring barrel 2, and the organic polyamine doser is used to add organic polyamine to the reagent premixing reaction stirring barrel 2, and the metal ions and the organic polyamine can react in the reagent premixing reaction stirring barrel 2 to generate an organic polyamine-metal ion complex.

[0043] Specifically, the flotation recovery system for sulfide minerals in the cyanide tailings mentioned above also includes a slurry stirring barrel 4 and a flotation device 6; the reagent pre-mixing reaction stirring barrel 2 is connected to the slurry stirring barrel 4, the organic polyamine-metal ion complex in the reagent pre-mixing reaction stirring barrel 2 is added to the slurry stirring barrel 4 to form a mixed slurry, and the organic polyamine-metal ion complex is used to activate and modify the sulfide minerals in the cyanide tailings slurry in the slurry stirring barrel 4; the bottom of the slurry stirring barrel 4 is connected to the flotation device 6, and the mixed slurry in the slurry stirring barrel 4 is passed into the flotation device 6 for ventilation flotation.

[0044] Specifically, a peristaltic pump 3 is provided between the reagent pre-mixing reaction stirring barrel 2 and the slurry stirring barrel 4; a slurry pump 5 is provided between the slurry stirring barrel 4 and the flotation device 6. The organic polyamine-metal ion complex can be added to the slurry stirring barrel 4 through the peristaltic pump 3.

[0045] Specifically, the flotation device 6 includes one or more flotation columns and / or flotation machines. The flotation device 6 can adopt a combination of multiple flotation columns and / or flotation machines according to actual needs, and design a reasonable flotation process to achieve efficient recovery of sulfide minerals.

[0046] as follows Figure 2 As shown, a flotation column is used as an example: an overflow port 7 and a feed port 9 are provided at the top of the flotation device 6 , an underflow port 8 is provided at the bottom, and a bubble generator 10 is provided at the lower part of the flotation device 6 .

[0047] In order to provide bubbles and water flow to the maximum extent, the height H of the bubble generator 10 from the bottom flow port 8 is 1 If the value is too large, the rising path of the bubbles from the bubble generator 10 will be too small, the probability of collision between the bubbles and the particles in the slurry will be reduced, and the flotation effect will be reduced; 1 If the height H of the bubble generator 10 from the bottom flow port 8 is too small, the high concentration of slurry at the bottom will hinder the rising water flow and bubbles, reducing the separation effect. 1 It is 1 / 4 to 1 / 3 of the total height H of the flotation device 6.

[0048] Specifically, the organic polyamine-metal ion complex can be added to the slurry stirring barrel 4 through the peristaltic pump 3, and the slurry stirring barrel 4 is filled with cyanide tailings slurry with a mass concentration of 20%-45% (such as 25%, 30%, 35%, 40%, 45%), which is a mixture of cyanide tailings and added clean water; the organic polyamine-metal ion complex and other flotation reagents such as pH adjusters are fully mixed and reacted with mineral particles in the slurry stirring barrel 4 to adjust the slurry. In this process, the organic polyamine-metal ions fully react with the mineral surface and the solution, and the organic polyamine-metal ion complex is selectively adsorbed on the surface of the sulfide mineral in the cyanide tailings, thereby eliminating the inhibitory effect of cyanide on the flotation of sulfide ores.

[0049] Specifically, the cyanide tailings slurry that has been slurried in the slurry stirring barrel 4 is fed into the flotation device 6 through the slurry pump 5. During the flotation process of the flotation device 6, the hydrophobic sulfide mineral particles adhere to the bubbles and rise into the foam layer, and then overflow from the overflow port 7; the hydrophilic gangue particles cannot float up and become tailings and are discharged from the underflow port 8 at the bottom of the flotation device 6.

[0050] It should be noted that the method of using the flotation recovery system for sulfide minerals in the cyanide tailings is as follows:

[0051] Step 1: using a metal ion doser and an organic polyamine doser respectively, adding metal ions and organic polyamines into a pre-mixed reaction stirring tank 2 (also called a reagent mixing reactor) containing water, and stirring the reaction to obtain a reaction product which is a solution containing an organic polyamine-metal ion complex;

[0052] Step 2: in a slurry mixing tank 4, the cyanide tailings are prepared into a slurry with a mass concentration of 20%-45%, and the slurry is adjusted to a pH of 7.0-9.0;

[0053] Step 3: Use peristaltic pump 3 to add the reaction product of step 1 to the slurry of step 2. The amount of the reaction product of step 1 added is 80-200g / t. 矿 ; Stirring the reaction to obtain a mixed slurry;

[0054] Step 4: Use a slurry pump to pass the mixed slurry into the flotation equipment 6 to perform aeration flotation to obtain the floated sulfide minerals.

[0055] Specifically, the main components of the cyanide tailings include sulfide minerals such as pyrite, chalcopyrite, galena, sphalerite, and gangue minerals such as quartz and aluminosilicate, wherein the sulfur content is 10%-35%.

[0056] Specifically, in the above step 1, the organic polyamine is a hydrophobic organic polyamine, and the hydrophobic organic polyamine includes the following characteristics:

[0057] 1. The molecular structure contains more than two -NH 2 and / or —NH— structure;

[0058] 2. The molecular structure also contains a hydrophobic structure, which includes an aromatic group or a C4-C20 alkyl group.

[0059] Specifically, the hydrophobic organic polyamine may be an alkyl polyamine ether, wherein the alkyl group may be a hydrocarbon chain containing four to twenty carbon atoms and one to four amino groups in the molecule; specifically, the alkyl polyamine ether may be dodecyl diamine ether or hexadecyl triamine ether. 1 -(2-(Decyloxy)ethyl)-1,2-ethylenediamine, N 1 -(2-aminoethyl)-N 2 -(3-tridecyloxy)propyl)-1,2-ethylenediamine, etc.

[0060] Specifically, in the above step 1, the hydrophobic organic polyamine may also be N-tetradecyl-1,3-propyldiamine or the like.

[0061] Specifically, in the above step 1, the hydrophobic organic polyamine may be:

[0062] CH 3 -(CH 2 ) 9 -O-(CH 2 ) 2 -NH-(CH 2 ) 2 -NH 2

[0063] or

[0064] CH 3 -(CH 2 ) 12 -O-(CH 2 ) 3 -NH-(CH 2 ) 2 -NH-(CH 2 ) 2 -NH 2

[0065] or

[0066] CH 3 -(CH 2 ) 13 -NH-(CH 2 ) 3 -NH 2

[0067] Specifically, in the above step 1, the hydrophobic organic polyamine and Fe2+ or Cu + Too large a molar ratio of Fe leads to incomplete complexation and low complex yield; too small a molar ratio leads to excessive metal ions, interfering with subsequent flotation. 2+ or Cu + The molar ratio is 1-3:1.

[0068] Specifically, in the above step 1, Fe 2+ The source can be FeCl 2 , Cu + The source may be CuCl.

[0069] Specifically, in the above step 1, the mass fraction of the hydrophobic organic polyamine in water is 1%-20%.

[0070] Specifically, in the above step 1, too short a stirring reaction time will result in incomplete reaction, and too long a stirring reaction time will result in increased energy consumption. Therefore, the stirring reaction time is controlled to be 2-15 minutes; illustratively, such as 3 minutes, 5 minutes, 7 minutes, 10 minutes, 12 minutes, and 15 minutes.

[0071] Specifically, in the above step 2, if the mass concentration of the ore pulp is too high, it will make it difficult for the flotation reagent to be effectively dispersed and reacted in the ore pulp, and cause serious gangue entrainment in the subsequent flotation process; if the ore pulp concentration is too low, it will lead to a decrease in the system processing capacity and a decrease in the flotation recovery rate. Therefore, the mass concentration of the ore pulp is controlled to be 20%-45%; for example, 20%, 25%, 30%, 35%, 40%, 45%.

[0072] Specifically, in the above step 2, the pH is controlled to be 7-9 (eg, 7.0, 7.5, 8.0, 8.5, 9.0) in order to provide a suitable solution environment for the interaction between the flotation reagent and the mineral surface.

[0073] Specifically, in the above step 3, if the stirring time is too long, part of the organic polyamine-metal ion complex adsorbed on the surface of the sulfide mineral will be desorbed, and the energy consumption of mechanical stirring will be increased; while if the stirring time is too short, the organic polyamine-metal ion will be fully adsorbed on the surface of the mineral. Therefore, the stirring reaction time is controlled to be 3-15 minutes, for example, 3 minutes, 5 minutes, 7 minutes, 10 minutes, 12 minutes, and 15 minutes.

[0074] Specifically, the principle of the flotation recovery method of sulfide minerals in the cyanide tailings is as follows:

[0075] In the above step 1, in the hydrophobic organic polyamine, -NH 2Or the N atom in —NH— contains an unshared electron pair, so hydrophobic organic polyamines can give up lone pairs of electrons in chemical reactions; metal ions such as Fe 2+ or Cu + can accept lone pairs of electrons; therefore, the hydrophobic organic polyamine acts as a multidentate ligand and binds to the Fe as the central atom. 2+ or Cu + Can react and form hydrophobic organic polyamine-metal ion complexes, such as [Fe(C 14 H 32 N 2 O)] + , [Cu(C 20 H 45 N 3 O) 2 ] + , [Cu(C 17 H 38 N 2 ) 2 ] + wait.

[0076] In the above step 3, the hydrophobic organic polyamine-metal ion complex is added to the slurry of the cyanide tailings, and can react with the hydrophilic cyanide component on the surface of the sulfide mineral (in the cyanide gold extraction operation, cyanide changes the surface properties of the sulfide mineral and produces cyanide-containing components on the surface of the sulfide mineral) to form a hydrophobic organic polyamine-metal ion-cyanide complex on the mineral surface. Among them, one end of the ammonia / amine-metal ion in the hydrophobic organic polyamine-metal ion complex reacts with the cyanide component on the surface of the sulfide mineral, so that the complex is adsorbed on the surface of the sulfide mineral, and the hydrophobic end faces the solution, making the mineral surface hydrophobic.

[0077] Specifically, in the untreated cyanide tailings, the surfaces of all mineral particles (including sulfide minerals and gangue minerals) are hydrophilic. In the above step 3, the hydrophilic cyanide component (such as [Fe(CN) 6 ] 4- , Fe 4 [Fe(CN) 6 ] 3The hydrophobic organic polyamine-metal ion complex produced in step 1 undergoes a complex reaction, so that it is adsorbed on the surface of the sulfide mineral, thereby causing the surface of the sulfide mineral to be hydrophobic; therefore, during the flotation process in step 4, the hydrophobic sulfide mineral can adhere to the bubbles and rise with the bubbles into the foam layer, while the hydrophilic gangue mineral remains in the pulp, thereby achieving the flotation separation of the sulfide mineral and the gangue mineral. On the other hand, the hydrophobic organic polyamine-metal ion complex can also react with the residual free cyanide in the pulp to generate a solid precipitate; thereby eliminating the inhibitory effect of cyanide on the sulfide mineral, improving the floatability of the sulfide mineral, and improving the recovery rate of the sulfide mineral.

[0078] In a possible design, in the above step 1, the organic polyamine is a molecule containing two or more -NH 2 The organic polyamine may be an organic substance having a structure of -NH- (i.e., amino) and / or -NH- (i.e., amine). The organic polyamine may be one or more of aliphatic amines, alcohol amines, aromatic amines, alicyclic amines, amides, or naphthylamines. Exemplary examples include triethylenetetramine, diethylenetriamine, ethylenediaminetetraacetate, tetraethylenepentamine, and the like.

[0079] Specifically, in the above step 3, after obtaining the mixed ore pulp, it also includes adding a collector for flotation of sulfide minerals to the mixed ore pulp, stirring and reacting for 3-10 minutes; the collector is adsorbed on the surface of the sulfide mineral to make the surface of the sulfide mineral hydrophobic. Wherein, the collector is a xanthate agent, for example, butyl xanthate, isopentyl xanthate, etc. The organic polyamine-metal ion complex is added to the slurry of the cyanide tailings as an activator, and the activator reacts with the exposed cyanide-containing components on the surface of the sulfide ore and adsorbs on the surface of the mineral, eliminating the obstacle of the original exposed cyanide on the surface of the sulfide ore to the adsorption of the xanthate collector; the xanthate collector selectively adsorbs on the surface of the sulfide ore to make the surface of the sulfide ore hydrophobic, while the surface of the gangue mineral cannot adsorb the xanthate and remains hydrophilic. During the flotation process, the hydrophobic sulfide ore particles adhere to the bubbles and rise into the concentrate, and the gangue minerals are difficult to adhere to the bubbles due to the hydrophilic surface and remain in the slurry. The flotation separation of sulfide ore and gangue minerals is achieved through the above process.

[0080] Specifically, in the above step 4, the step of aeration flotation includes:

[0081] Step 401, the slurry in the slurry mixing barrel 4 is introduced into the flotation device 6 through the slurry pump 5, and air is introduced into the slurry in the flotation device through the self-priming of the flotation device or the inflation of the air compressor, and a large number of bubbles are generated through the bubble generator 10 or mechanical stirring;

[0082] Step 402: After ventilation, the sulfide mineral particles adhere to the bubbles due to their hydrophobic surface and rise with the bubbles into the foam layer, while the gangue mineral particles cannot adhere to the bubbles due to their hydrophobic surface and remain in the slurry. The selected sulfide minerals are discharged from the overflow port 7, and the gangue minerals are discharged as tailings through the underflow port 8.

[0083] Specifically, in the above step 402, the pulp concentration is 20%-45%, and the flotation time is 10-25 minutes.

[0084] Specifically, in the above step 402, according to different flotation processes, multiple flotation equipments can be used in combination, for example, the concentrate from roughing is sent to the second flotation equipment for concentrating, and the tailings from roughing are sent to the third flotation equipment for scavenging. In order to achieve the best economic and technical indicators, for different cyanide tailings, it is generally necessary to determine the best flotation process flow in advance through mineral processing tests, such as a roughing process, a roughing process, a scavenging process, a closed process, etc.

[0085] Compared with the prior art, the flotation recovery system of the present invention is provided with a reagent pre-mixing reaction stirring tank, Fe 2+ or Cu + Ions and hydrophobic organic polyamines are first introduced into a pre-mixed reaction stirring barrel for reagents, and fully mixed and reacted under suitable conditions. The reaction products are then introduced into a slurry stirring barrel for slurry adjustment. This avoids the interference of the complex environment in the slurry on the reaction between reagents and increases the efficiency of the flotation reagents.

[0086] The reagent pre-mixing reaction stirring barrel, slurry stirring barrel and flotation equipment of the flotation system of the present invention are arranged in a modular manner, which is convenient for combination and adjustment according to the actual production of different mines; a reasonable flotation process is designed to achieve efficient recovery of sulfide minerals. The system has the characteristics of less equipment, short process, low operating cost, less maintenance difficulty and less investment.

[0087] When the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings, metal ions and organic polyamines react in a reagent pre-mixed reaction stirring barrel to generate a flotation reagent organic polyamine-metal ion complex that can be selectively adsorbed on the surface of sulfide minerals, and no dangerous products are generated; and the reagent can also precipitate residual cyanide in the original cyanide tailings, eliminating the original safety hazards of the cyanide tailings, and has high environmental friendliness.

[0088] When the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings, the hydrophobic organic polyamine-metal ion complex produced by the mixed reaction of metal ions and hydrophobic organic polyamines can react with the cyanide on the surface of the sulfide mineral to generate a hydrophobic organic polyamine-metal ion-cyanide complex on the surface of the mineral, thereby selectively adsorbing on the surface of the sulfide mineral, eliminating the inhibitory effect of cyanide on the flotation of sulfide minerals; and one end of the hydrophobic group faces the solution, making the mineral surface hydrophobic, and realizing the flotation separation of sulfide minerals and gangue minerals during the flotation process. The sulfur grade and recovery rate of the sulfide minerals obtained when the flotation recovery system of the present invention is used to flotate and recover sulfide minerals in cyanide tailings are both high. In addition, the flotation agent can also react with the residual cyanide in the ore pulp to generate a precipitate, eliminating the interference of residual cyanide on the flotation of sulfide minerals while also solving its harm to the environment.

[0089] Example 1

[0090] This embodiment provides a flotation recovery system for sulfide ore in cyanide tailings, such as Figure 1 As shown, it includes a doser 1, a reagent pre-mixing reaction stirring barrel 2, a slurry stirring barrel 4 and a flotation device 6; a peristaltic pump 3 is provided between the reagent pre-mixing reaction stirring barrel 2 and the slurry stirring barrel 4; a slurry pump 5 is provided between the slurry stirring barrel 4 and the flotation device 6; the doser 1 includes a metal ion doser and an organic polyamine doser; the metal ion doser is used to add metal ions to the reagent pre-mixing reaction stirring barrel 2, and the organic polyamine doser is used to add organic polyamine to the reagent pre-mixing reaction stirring barrel 2, and the metal ions and organic polyamines can react in the reagent pre-mixing reaction stirring barrel 2 to generate organic polyamine-metal ion complexes.

[0091] Specifically, the flotation device 6 includes a flotation column and / or a flotation machine. Figure 2 As shown, a flotation column is used as an example: an overflow port 7 and a feed port 9 are provided at the top of the flotation device 6 , an underflow port 8 is provided at the bottom, and a bubble generator 10 is provided at the lower part of the flotation device 6 .

[0092] Example 2

[0093] This embodiment provides a method for flotation recovery of sulfide ore in cyanide tailings using the above-mentioned flotation recovery system for sulfide ore in cyanide tailings. The sulfur grade of cyanide tailings is 22.89%, and the sulfide minerals are mainly pyrite, accounting for 93.25% of the total sulfide minerals, chalcopyrite and sphalerite account for 4.34% and 2.41% respectively. The gangue minerals are mainly quartz, feldspar, etc. Figure 6 As shown, the specific process is as follows:

[0094] (1) CuCl and alkyl polyamine ether (N 1 -(2-aminoethyl)-N2 -(3-tridecyloxy)propyl)-1,2-ethylenediamine) is added to a pre-mixed reaction stirring tank 2 (also called a reagent mixing reactor) containing water by a metal ion doser and an organic polyamine doser in a molar ratio of 1:1, and the reaction is stirred to obtain a reaction product which is a solution containing a hydrophobic organic polyamine-metal ion complex;

[0095] (2) In the slurry stirring barrel 4, the cyanide tailings are prepared to have a mass concentration of 38%, and the slurry pH is adjusted to 8.0;

[0096] (3) Using peristaltic pump 3, the reaction product in (1) is added to the slurry in step 2. The amount of the reaction product in step 1 added is 120 g / t 矿 ; Stirring the reaction to obtain a mixed slurry;

[0097] (4) Use a slurry pump to pass the mixed slurry into the flotation equipment 6 for aeration flotation to obtain the floated sulfide minerals.

[0098] The flotation process in (4) includes a closed-circuit flotation process consisting of a roughing process, a scavenging process and a cleaning process, which can obtain a sulfur concentrate with a sulfur grade of 44.33% and a recovery rate of 94.16%, and the sulfur grade in the tailings is reduced to 2.60%.

[0099] Example 3

[0100] This embodiment provides a method for flotation recovery of sulfide ore in cyanide tailings using the above flotation recovery system for sulfide ore in cyanide tailings. The sulfur grade of cyanide tailings is 18.46%, the sulfide minerals are mainly pyrite, and the gangue minerals are mainly quartz and silicate minerals. Figure 7 As shown, the specific process is as follows:

[0101] (1)FeCl 2 and triethylenetetramine in a molar ratio of 1:2 are added into a pre-mixed reaction stirring tank 2 (also called a reagent mixing reactor) containing water by a metal ion doser and an organic polyamine doser for stirring reaction to obtain a reaction product which is a solution containing an organic polyamine-metal ion complex;

[0102] (2) In the slurry stirring barrel 4, the cyanide tailings are prepared to have a mass concentration of 35%, and the slurry pH is adjusted to 8.5;

[0103] (3) The reaction product in (1) is added to the slurry in step 2 by using a peristaltic pump 3. The amount of the reaction product in step 1 added is 150 g / t 矿 ; Stirring the reaction to obtain a mixed slurry;

[0104] (4) adding 200 g / t of butyl xanthate to the slurry stirring barrel 4 to further improve the hydrophobicity of the sulfide mineral;

[0105] (5) Use a slurry pump to pass the slurry in the slurry mixing tank into the flotation column, aerate and flotate for 20 minutes.

[0106] Through the above method, after a period of flotation column separation, a sulfur concentrate with a sulfur grade of 41.33% and a recovery rate of 85.50% can be obtained, and the sulfur grade in the tailings is reduced to 4.33%.

[0107] Example 4

[0108] This embodiment provides a method for flotation recovery of sulfide ore in cyanide tailings using the above flotation recovery system for sulfide ore in cyanide tailings. The sulfur grade in cyanide tailings is 25.01%, the main metal minerals are pyrite, followed by chalcopyrite, and also contain a small amount of galena and sphalerite; the gangue minerals are quartz, feldspar, kaolinite, calcite, etc. Figure 8 As shown, the specific process is as follows:

[0109] (1) CuCl and alkyl polyamine ether (N 1 -(2-(decyloxy)ethyl)-1,2-ethylenediamine) is added to a pre-mixed reaction stirring tank 2 (also called a reagent mixing reactor) containing water by a metal ion doser and an organic polyamine doser in a molar ratio of 1:1 to obtain a reaction product which is a solution containing a hydrophobic organic polyamine-metal ion complex;

[0110] (2) In the slurry stirring barrel 4, the cyanide tailings are prepared to have a mass concentration of 40%, and the slurry pH is adjusted to 8.5;

[0111] (3) The reaction product in (1) is added to the slurry in step 2 by using a peristaltic pump 3. The amount of the reaction product in step 1 added is 100 g / t 矿 ; Stirring the reaction to obtain a mixed slurry;

[0112] (4) Use a slurry pump to pass the slurry in the slurry mixing tank into the cyclone-static microbubble flotation column for aeration flotation. The flotation time is 20 minutes.

[0113] Through the above method, after a closed-circuit flotation process consisting of a roughing stage, a scavenging stage and a cleaning stage, a sulfur concentrate with a sulfur grade of 46.97% and a recovery rate of 96.40% can be obtained, and the sulfur grade of the tailings is reduced to 1.85%.

[0114] Comparative Example 1

[0115] The treatment object of Comparative Example 1 is the same as that of Example 4, but a conventional flotation system and process are used. The flotation system includes a stirring tank and a flotation device. The flotation process includes the following steps:

[0116] (1) preparing cyanide tailings into a slurry with a mass concentration of 40% in a stirring barrel;

[0117] (2) adding 12 kg / t of sulfuric acid to the slurry, stirring and reacting for 20 min, adjusting the pH of the slurry to 5.5, adding 500 g / t of butyl xanthate as a collector to the slurry, stirring and reacting for 3 min;

[0118] (3) Use a slurry pump to pass the slurry into the cyclone-static microbubble flotation column and aerate for flotation for 20 minutes.

[0119] The production indicators of Example 4 and Comparative Example 1 are shown in Table 1 below; it can be seen from Table 1 that the concentrate grade and recovery rate of Example 4 are higher than those of Comparative Example 1, and the sulfur grade of the tailings is lower. It can be seen that the flotation recovery system of the present invention is used to flotation recover sulfide minerals in cyanide tailings. The concentrate grade and recovery rate are both high, and the advantages are obvious in production.

[0120] Table 1 Production indicators of Example 4 and Comparative Example 1

[0121]

[0122] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A flotation recovery system for sulfide minerals in cyanide tailings, characterized in that: It comprises a doser (1) and a reagent premixing reaction stirring barrel (2); the doser (1) comprises an organic polyamine doser and a metal ion doser; the organic polyamine doser and the metal ion doser are respectively connected to the reagent premixing reaction stirring barrel (2); The metal ion doser is used to add the metal ion reagent to the reagent premixing reaction stirring barrel (2), and the organic polyamine doser is used to add the organic polyamine to the reagent premixing reaction stirring barrel (2), and the metal ion reagent and the organic polyamine can react in the reagent premixing reaction stirring barrel (2) to generate an organic polyamine-metal ion complex; The organic polyamine is a hydrophobic organic polyamine, and the hydrophobic organic polyamine has the following characteristics: molecular The structure contains more than two -NH2 and / or -NH- structures; The molecular structure also contains a hydrophobic structure, which includes an aromatic group and a C4-C20 alkyl group; The hydrophobic organic polyamine is an alkyl polyamine ether; The metal ions include: Fe 2+ or Cu + .

2. The flotation recovery system for sulfide minerals in cyanide tailings according to claim 1, characterized in that: It also includes a slurry stirring barrel (4) and a flotation device (6); The reagent pre-mixing reaction stirring barrel (2) is connected to the ore pulp stirring barrel (4), and the organic polyamine-metal ion complex in the reagent pre-mixing reaction stirring barrel (2) is added to the ore pulp stirring barrel (4) to form a mixed ore pulp, and the organic polyamine-metal ion complex is used to activate and modify the sulfide minerals in the cyanide tailings slurry in the ore pulp stirring barrel (4); The bottom of the slurry stirring barrel (4) is connected to the flotation equipment (6), and the mixed slurry in the slurry stirring barrel (4) is passed into the flotation equipment (6) for aeration flotation.

3. The flotation recovery system for sulfide minerals in cyanide tailings according to claim 2, characterized in that: A peristaltic pump (3) is provided between the reagent pre-mixing reaction stirring barrel (2) and the ore slurry stirring barrel (4); and a slurry pump (5) is provided between the ore slurry stirring barrel (4) and the flotation equipment (6).

4. The flotation recovery system for sulfide minerals in cyanide tailings according to claim 2, characterized in that: The flotation device (6) comprises one or more flotation columns and / or flotation machines.

5. The flotation recovery system for sulfide minerals in cyanide tailings according to claim 1, characterized in that: The main components of the cyanide tailings include: sulfide minerals and gangue minerals.

6. The flotation recovery system for sulfide minerals in cyanide tailings according to any one of claims 1 to 5, characterized in that: The method of using the flotation recovery system for sulfide minerals in the cyanide tailings is as follows: Step 1: using a metal ion doser and an organic polyamine doser respectively, add a metal ion reagent and an organic polyamine into a pre-mixed reaction stirring tank (2) containing water, and perform a stirring reaction to obtain a reaction product which is a solution containing an organic polyamine-metal ion complex; Step 2: In a slurry mixing tank (4), the cyanide tailings are prepared into a slurry with a mass concentration of 20%-45%, and the slurry is adjusted to a pH of 7.0-9.0; Step 3: using a peristaltic pump (3) to add the reaction product of step 1 to the ore slurry of step 2, stirring and reacting to obtain a mixed ore slurry; Step 4: Use a slurry pump (5) to pass the mixed slurry into the flotation equipment (6) for aeration flotation to obtain the floated sulfide minerals.

7. The flotation recovery system for sulfide minerals in cyanide tailings according to claim 6, characterized in that: In the step 1, the molar ratio of the hydrophobic organic polyamine to the metal ion is 1-3:1.

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