A short process for efficiently recovering molybdenum from copper-molybdenum mixed concentrate

Abstract

The application discloses a kind of short process from copper-molybdenum mixed concentrate high-efficiency recovery molybdenum method, management is simple and convenient, reagent cost is low, separation efficiency is high, strong adaptability, index is stable.Hydraulic cyclone classification overflow is dehydrated and depharmaceutical by thickener and then enters the flotation column to carry out fine selection I operation, fully gives the characteristics of fine particle level high-efficiency recovery of flotation column, uses diesel instead of kerosene as collector, improves the thickness and stability of foam.Hydraulic cyclone classification underflow and flotation column tailings are mixed into fine scavenging, one is to optimize the particle size composition, play the function of coarse particle level carrier, form carrier flotation, strengthen the recovery of fine particle level, two is to give full play to the performance of flotation machine, increase the recovery effect of coarse particle level, also avoid the wear and blockage of coarse particle level to the aeration device in the flotation column.Sweeping concentrate and fine scavenging tailings are combined and ground, through depth dissociation of intergrowth, effectively reduce the content of molybdenum in sweeping tailings, improve the comprehensive recovery rate of molybdenum.

Description

Technical Field

[0001] This invention relates to the field of polymetallic sulfide ore beneficiation technology, specifically to a short-process method for efficiently recovering molybdenum from copper-molybdenum mixed concentrate. Background Technology

[0002] Currently, the main methods for separating copper and molybdenum in mixed copper-molybdenum concentrates, both domestically and internationally, are flotation separation, and most of these methods employ a copper-suppressing, molybdenum-floating flotation separation process. This process generally suffers from the following drawbacks:

[0003] (1) The enrichment ratio of each operation is low, the process flow is long, the number of selection operations reaches 5-6 times or more, and the management is difficult.

[0004] (2) Conventional inhibitors such as sodium sulfide have a short action time and a long process, resulting in high drug costs. Other inhibitors such as Knox inhibitors and cyanide inhibitors are more harmful to the environment.

[0005] (3) Molybdenite is brittle and easy to grind, and is easy to over-grind. It is difficult to recover through flotation. Copper and molybdenum concentrates are severely inter-containing.

[0006] With the resolution of problems such as frequent clogging of bubble generators, flotation columns have been widely used in copper-molybdenum separation processes in recent years. The combined use of flotation machines and columns (flotation machines for roughing and cleaning, and flotation columns for cleaning) has been widely adopted. However, the uneven particle size distribution in the slurry leads to bubble generator clogging and excessive wear, while the copper-molybdenum separation effect is not ideal, with high levels of copper-molybdenum intermingling. For example, Chinese patent application CN102631994A discloses a combined column-flotation separation method for difficult-to-process low-grade copper-molybdenum ores. It employs a two-stage closed-circuit grinding-mixed flotation-mixed concentrate regrinding-copper-suppression and molybdenum-flotation process for skarn-type copper ores with associated molybdenum in my country. The scavenging operation uses a flotation machine, while roughing and cleaning operations use flotation columns. By using multiple flotation columns in combination, the flotation concentration of the columns is reduced, reagent consumption is increased, and the flotation effect is reduced. This does not fundamentally solve the problem of damage to the flotation column and recovery issues caused by coarse particles. Furthermore, the reduction in the concentration of fine particles also significantly reduces the recovery effect. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention aims to provide a short-process method for efficiently recovering molybdenum from copper-molybdenum mixed concentrate. This method can effectively separate copper and molybdenum metals, while also offering high separation efficiency, good stability, simple operation, high degree of automation, and significantly reduced reagent consumption, thereby significantly lowering the cost of flotation reagents.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A short-process method for efficiently recovering molybdenum from a copper-molybdenum mixed concentrate includes the following steps:

[0010] S1. After roughing the copper-molybdenum mixed concentrate, roughing concentrate and roughing tailings are obtained. The roughing tailings are then subjected to scavenging to obtain scavenging concentrate and scavenging tailings. The scavenging tailings are copper concentrate.

[0011] S2. The rough concentrate obtained in step S1 is classified using a hydrocyclone to obtain a classification overflow and a classification underflow.

[0012] S3. The classification overflow obtained in step S2 is concentrated by a thickener, and the underflow from the thickener enters the flotation column for fine cleaning operation I to obtain flotation column concentrate and flotation column tailings. The flotation column tailings are combined with the classification underflow obtained in step S2 and enter the fine scavenging process to obtain fine scavenging concentrate and fine scavenging tailings.

[0013] S4. The flotation column concentrate obtained in step S3 is combined with the scavenging concentrate and enters the cleaning operation II to obtain cleaning II concentrate and cleaning II tailings. The cleaning II concentrate is the molybdenum concentrate. The scavenging concentrate obtained in step S1 and the scavenging tailings obtained in step S3 are combined and then ground in a mill before being returned to the roughing operation. The cleaning II tailings are returned to the thickener.

[0014] Further, the specific process of the roughing operation in step S1 is as follows: adjust the slurry mass concentration of the copper-molybdenum mixed flotation concentrate to 25-30%, and add 1000-1200g / t of water glass as a modifier, 10000-15000g / t of sodium sulfide as an inhibitor and 200-300g / t of kerosene as an antifoaming agent per ton of dry weight of raw ore, and carry out roughing to obtain roughing concentrate and roughing tailings.

[0015] Further, in step S1, the specific process of the scavenging operation is as follows: based on the dry weight of each ton of raw ore, add 500-600g / t of water glass as a modifier, 3000-5000g / t of sodium sulfide as an inhibitor, and 100-150g / t of kerosene as a defoamer to the roughing tailings, and carry out scavenging to obtain scavenged concentrate and scavenged tailings.

[0016] Furthermore, in step S3, the staged overflow enters the thickener for dehydration and concentration until the underflow mass concentration of the thickener is 35%-40%.

[0017] Further, in step S3, the specific process of the fine selection I operation is as follows: based on the dry weight of the raw ore, add 1000-1500 g / t of the inhibitor mercaptoacetic acid and 3000-5000 g / t of sodium sulfide and 20-30 g / t of the collector diesel to the underflow of the thickener, and then enter the flotation column for fine selection I operation to obtain flotation column concentrate and flotation column tailings.

[0018] Further, in step S3, the specific process of the fine scavenging operation is as follows: after the flotation column tailings and the classification underflow are combined, 1500-2000 g / t of sodium sulfide inhibitor and 10-15 g / t of kerosene collector are added to them based on the dry weight of the original ore, and fine scavenging operation is carried out to obtain fine scavenged concentrate and fine scavenged tailings.

[0019] Further, in step S4, the specific process of the second-stage cleaning operation is as follows: after merging the flotation column concentrate and the scavenging concentrate, add 500-1000 g / t of water glass as a modifier and 1000-1500 g / t of sodium sulfide as an inhibitor based on the dry weight of the original ore, and carry out the second-stage cleaning operation to obtain the second-stage cleaning concentrate and the second-stage cleaning tailings.

[0020] Furthermore, in step S4, the scavenging concentrate and the fine scavenging tailings are combined and then ground in a mill until 80-85% of the material is -0.074mm.

[0021] The beneficial effects of this invention are as follows: This invention adopts a "separate separation and diversion" technical approach, fully leveraging the mineralogical characteristics of copper-molybdenum mixed concentrate and the advantages of flotation machines and columns. Combined with a short process flow, it can efficiently and rapidly recover the target mineral, featuring simple management, low reagent costs, high separation efficiency, strong adaptability, and stable indicators. The hydrocyclone stage overflow is dewatered and de-reagented by a thickener before entering the fine-cleaning stage (flotation column), fully utilizing the flotation column's high efficiency in recovering fine particles (high enrichment ratio). Diesel fuel is used instead of kerosene as the collector, improving foam thickness and stability. Secondly, the hydrocyclone stage underflow and flotation column tailings are mixed before entering the fine scavenging stage. This optimizes the particle size distribution, enhances the coarse particle carrier function, forms carrier flotation, and strengthens the recovery of fine particles. It also fully utilizes the performance of the flotation machine, increasing the recovery effect of coarse particles while avoiding wear and blockage of the aeration device in the flotation column caused by coarse particles. In addition, the combined grinding of scavenging concentrate and scavenging tailings effectively reduces the molybdenum content in the scavenging tailings and improves the overall molybdenum recovery rate by deeply liberating the intergrowth. Attached Figure Description

[0022] Figure 1 The following are flowcharts of the methods in embodiments 1 and 2 of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0024] Example 1

[0025] This embodiment provides a short-process method for efficiently recovering molybdenum from a copper-molybdenum mixed concentrate. The copper-molybdenum mixed concentrate used is the Duobaoshan copper-molybdenum mixed concentrate, whose chemical composition (wt%) is as follows: Cu 25.12%, Mo 0.63%, SiO2 7.44%, CaO 2.86%, etc. Copper is mainly found in chalcopyrite and bornite, with a relatively small amount of chalcocite. Molybdenum is mostly found in molybdenite, with a medium to fine particle size, mainly concentrated between 10-74 μm. Other metal sulfides are mainly pyrite, and non-metallic minerals are mainly epidote, feldspar, and quartz, with small amounts of chlorite, muscovite, biotite, etc.

[0026] like Figure 1 As shown, the specific process of the method is as follows:

[0027] The copper-molybdenum mixed concentrate is adjusted to a flotation mass concentration of 25% by regulating the flushing water volume. After one roughing and one scavenging process, rougher concentrate, scavenger concentrate, and scavenger tailings (copper concentrate) are obtained. The rougher concentrate is classified by a hydrocyclone. The overflow from the classification is concentrated to a mass concentration of 35% by a thickener and then enters the flotation column for cleaning operation I. The flotation column tailings from cleaning operation I are combined with the underflow from the classification and enter the fine scavenging process to obtain fine scavenger concentrate and fine scavenger tailings. The flotation column concentrate and the fine scavenger concentrate are combined and enter cleaning operation II to obtain molybdenum concentrate and cleaning operation II tailings. The scavenger concentrate and the fine scavenger tailings are combined and ground in a mill until 80% of the particles are -0.074mm, then returned to the roughing operation. The cleaning operation II tailings are returned to the thickener.

[0028] Specifically, based on the dry weight of each ton of raw ore, the roughing operation adds 1000g / t of water glass, 10000g / t of sodium sulfide, and 200g / t of kerosene; the scavenging operation adds 500g / t of water glass, 3000g / t of sodium sulfide, and 100g / t of kerosene; the cleaning I operation adds 1000g / t of mercaptoacetic acid, 3000g / t of sodium sulfide, and 20g / t of diesel oil; the fine scavenging operation adds 1500g / t of sodium sulfide and 10g / t of kerosene; and the cleaning II operation adds 500g / t of water glass and 1000g / t of sodium sulfide.

[0029] Example 2

[0030] This embodiment provides a short-process method for efficiently recovering molybdenum from a copper-molybdenum mixed concentrate, using the same copper-molybdenum mixed concentrate as in Example 1.

[0031] The method and process of this embodiment are the same as those of Embodiment 1. The main difference lies in the process parameters. In this embodiment, the copper-molybdenum mixed concentrate is adjusted to a flotation mass concentration of 30% by adjusting the amount of flushing water; the overflow from the classification is concentrated to a mass concentration of 40% by a thickener; the scavenging concentrate and the fine scavenging tailings are combined and ground in a mill until 85% of the material is -0.074mm.

[0032] For the roughing operation, add 1200g / t of water glass, 15000g / t of sodium sulfide, and 300g / t of kerosene. For the scavenging operation, add 600g / t of water glass, 5000g / t of sodium sulfide, and 150g / t of kerosene. For the cleaning operation I, add 1500g / t of mercaptoacetic acid, 5000g / t of sodium sulfide, and 30g / t of diesel oil. For the fine scavenging operation, add 2000g / t of sodium sulfide and 15g / t of kerosene. For the cleaning operation II, add 1000g / t of water glass and 1500g / t of sodium sulfide.

[0033] The experimental results of the two embodiments are shown in Table 1.

[0034] Table 1

[0035]

[0036] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A short-process method for efficiently recovering molybdenum from a copper-molybdenum mixed concentrate, characterized in that, Includes the following steps: S1. After roughing the copper-molybdenum mixed concentrate, roughing concentrate and roughing tailings are obtained. The roughing tailings are then subjected to scavenging to obtain scavenging concentrate and scavenging tailings. The scavenging tailings are copper concentrate. S2. The rough concentrate obtained in step S1 is classified using a hydrocyclone to obtain a classification overflow and a classification underflow. S3. The classification overflow obtained in step S2 is concentrated by a thickener, and the underflow from the thickener enters the flotation column for fine cleaning operation I to obtain flotation column concentrate and flotation column tailings. The flotation column tailings are combined with the classification underflow obtained in step S2 and enter the fine scavenging process to obtain fine scavenging concentrate and fine scavenging tailings. S4. The flotation column concentrate obtained in step S3 is combined with the scavenging concentrate and enters the cleaning operation II to obtain cleaning II concentrate and cleaning II tailings. The cleaning II concentrate is the molybdenum concentrate. The scavenging concentrate obtained in step S1 and the scavenging tailings obtained in step S3 are combined and then ground in a mill before being returned to the roughing operation. The cleaning II tailings are returned to the thickener.

2. The method according to claim 1, characterized in that, The specific process of roughing in step S1 is as follows: Adjust the slurry mass concentration of the copper-molybdenum mixed concentrate to 25-30%, and add 1000-1200g / t of water glass as a modifier, 10000-15000g / t of sodium sulfide as an inhibitor and 200-300g / t of kerosene as a collector per ton of dry weight of raw ore, and carry out roughing to obtain roughing concentrate and roughing tailings.

3. The method according to claim 1, characterized in that, In step S1, the specific process of scavenging is as follows: based on the dry weight of each ton of raw ore, add 500-600g / t of water glass as a modifier, 3000-5000g / t of sodium sulfide as an inhibitor, and 100-150g / t of kerosene as a collector to the roughing tailings, and carry out scavenging to obtain scavenged concentrate and scavenged tailings.

4. The method according to claim 1, characterized in that, In step S3, the staged overflow enters the thickener for dehydration and concentration until the underflow mass concentration of the thickener is 35%-40%.

5. The method according to claim 1, characterized in that, In step S3, the specific process of the fine selection I operation is as follows: based on the dry weight of the raw ore, add 1000-1500 g / t of the inhibitor mercaptoacetic acid, 3000-5000 g / t of sodium sulfide, and 20-30 g / t of the collector diesel oil to the underflow of the thickener, and then enter the flotation column for fine selection I operation to obtain flotation column concentrate and flotation column tailings.

6. The method according to claim 1, characterized in that, In step S3, the specific process of the fine scavenging operation is as follows: after the flotation column tailings and the classification underflow are combined, 1500-2000 g / t of sodium sulfide inhibitor and 10-15 g / t of kerosene collector are added to them based on the dry weight of the original ore, and fine scavenging operation is carried out to obtain fine scavenging concentrate and fine scavenging tailings.

7. The method according to claim 1, characterized in that, In step S4, the specific process of the second-stage beneficiation operation is as follows: after merging the flotation column concentrate and the scavenging concentrate, add 500-1000 g / t of water glass as a modifier and 1000-1500 g / t of sodium sulfide as an inhibitor based on the dry weight of the original ore, and carry out the second-stage beneficiation operation to obtain the second-stage beneficiation concentrate and the second-stage beneficiation tailings.

8. The method according to claim 1, characterized in that, In step S4, the scavenging concentrate and the fine scavenging tailings are combined and then ground in a mill until -0.074mm accounts for 80-85%.

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