Magnetic separation process for separating fine-grained copper-molybdenum bulk concentrate

Abstract

The application discloses a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrate, and comprises the following steps: roasting and deoiling the fine-grained copper-molybdenum mixed concentrate to obtain copper-molybdenum mixed dry concentrate; preparing a slurry by mixing the copper-molybdenum mixed dry concentrate and water, and sequentially adding an inhibitor, a magnetic intensifier, a strong oxidant and an adjusting agent into the slurry to obtain a copper-molybdenum mixed slurry; and feeding the copper-molybdenum mixed slurry into a wet high-intensity magnetic separator to perform copper-molybdenum magnetic separation, so as to obtain copper concentrate and molybdenum concentrate. The inhibitor, the magnetic intensifier, the strong oxidant and the adjusting agent jointly solve the problem of easy agglomeration of chalcopyrite and molybdenite. During the magnetic separation process of the wet high-intensity magnetic separator, a large amount of flushing water needs to be added, and the reagents on the surface of the copper concentrate can be washed away by the flushing water, so that a good reagent removal effect can be achieved. The obtained magnetic separation concentrate is copper concentrate (copper content is greater than or equal to 12%), which not only increases the economic benefit of the product, but also improves the resource utilization rate.

Description

Technical Field

[0001] This invention belongs to the field of non-ferrous metal beneficiation technology, and relates to a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates. Background Technology

[0002] Molybdenum possesses excellent physicochemical properties and is used in many industries, including metallurgy, materials, and chemicals. However, copper-molybdenum separation is difficult. Currently, methods for copper-molybdenum separation include flotation, chemical methods, and magnetic separation. Flotation mainly employs a method of suppressing copper and floating molybdenum. The difficulty in flotation separation of fine-grained copper-molybdenum mixed ores lies in the fact that the fine particle size of the copper-molybdenum mixed concentrate leads to the easy formation of agglomeration, inclusions, and encapsulation of chalcopyrite and molybdenite. In addition, the concentrate and tailings slurry already contain a large amount of beneficiation reagents, making it difficult for copper suppressants to act on the active sites on the surface of chalcopyrite, thus weakening the copper suppression effect of the inhibitors. As a result, traditional flotation methods cannot achieve optimal results in copper-molybdenum separation. Chemical methods, using processes such as acid dissolution, heating, and filtration, can reduce the copper content in molybdenum to 0.2%, forming copper sulfate as a product. However, the hydrogen sulfide produced by this process is toxic, and the environmental treatment cost is high. Summary of the Invention

[0003] The purpose of this invention is to provide a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates, which solves the problem of poor copper-molybdenum separation effect in the prior art.

[0004] The technical solution adopted in this invention is a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates, comprising the following steps:

[0005] Step 1: Roast and deoil the fine-grained copper-molybdenum mixed concentrate to obtain copper-molybdenum mixed dry ore;

[0006] Step 2: Prepare a slurry by mixing copper-molybdenum mixed dry ore with water, and add inhibitor, magnetizing agent, strong oxidant and modifier to the slurry in sequence to obtain copper-molybdenum mixed slurry;

[0007] Step 3: Feed the copper-molybdenum mixed slurry into a wet high-intensity magnetic separator for copper-molybdenum magnetic separation to obtain copper concentrate and molybdenum concentrate.

[0008] The invention is further characterized by:

[0009] Step 1 involves placing the fine-grained copper-molybdenum mixed concentrate in a high-frequency furnace and roasting and degreasing it at 230°C to obtain the copper-molybdenum mixed dry ore.

[0010] Fine-grained copper-molybdenum mixed concentrate includes chalcopyrite, molybdenite, and gangue minerals.

[0011] The fineness of the copper-molybdenum mixed dry ore is -0.038 mm, accounting for more than 90%, and the degree of liberation of both chalcopyrite and molybdenite is greater than or equal to 90%.

[0012] The molybdenum grade in the copper-molybdenum mixed dry ore is 15%–20%, and the copper grade is 3%–7%.

[0013] The pulp concentration is 15-20%.

[0014] The inhibitor is sodium sulfide, with a dosage of 1000–2000 g / t; the magnetizing agent is TX01, with a dosage of 500–1000 g / t; the strong oxidizing agent is hydrogen peroxide, with a dosage of 1000–2000 g / t; and the adjusting agent is sodium hydroxide, which adjusts the pH value to 9–11.

[0015] In step 3, the stirring time of the wet high-intensity magnetic separator is 5 to 10 minutes, and the magnetic separation intensity of the magnetic separator is greater than or equal to 2.2T.

[0016] The beneficial effects of this invention are as follows: The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates solves the problem of easy agglomeration of chalcopyrite and molybdenite through the combined action of inhibitors, magnetizers, strong oxidants, and modifiers; since a large amount of washing water needs to be added during the magnetic separation process of the wet high-intensity magnetic separator, the reagents on the surface of the copper concentrate will be washed away by the washing water, which can play a good role in de-removal; the obtained magnetic concentrate is copper concentrate (copper content ≥12%), and the magnetic separation tailings are non-standard molybdenum concentrate, both of which can be sold directly, which increases the economic benefits of the products and improves the resource utilization rate. Attached Figure Description

[0017] Figure 1 This is a flowchart of the magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates according to the present invention. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] Magnetic separation processes for separating fine-grained copper-molybdenum mixed concentrates, such as Figure 1 As shown, it includes the following steps:

[0020] Step 1: Place the fine-grained copper-molybdenum mixed concentrate in an induction furnace and roast and deoil it at 200–250℃. This removes the molybdenum collector (kerosene, diesel oil) and frother (No. 2 oil) from the surface of the copper-molybdenum mixed ore, yielding a dry copper-molybdenum mixed ore. The fine-grained copper-molybdenum mixed concentrate includes chalcopyrite, molybdenite, and gangue minerals. The gangue minerals include quartz, potassium feldspar, mica, chlorite, and pyrite. The fineness of the dry copper-molybdenum mixed ore is -0.038 mm or more, accounting for ≥90%. The degree of liberation of both chalcopyrite and molybdenite is ≥90%. The molybdenum grade in the dry copper-molybdenum mixed ore is 15%–20%, and the copper grade is 3%–7%.

[0021] Step 2: Prepare a slurry with a concentration of 15% to 20% by mixing copper-molybdenum mixed dry ore and water. Add inhibitors, magnetizers, strong oxidants and modifiers to the slurry in sequence to obtain copper-molybdenum mixed slurry.

[0022] Specifically, the inhibitor is sodium sulfide, with a dosage of 1000-2000 g / t; the magnetizing agent is TX01, with a dosage of 500-1000 g / t; the strong oxidizing agent is hydrogen peroxide, with a dosage of 10-50 ml; and the adjusting agent is sodium hydroxide, which adjusts the pH of the slurry to 9-11.

[0023] The purpose of adding reagents to the slurry is to better separate molybdenite from chalcopyrite.

[0024] Sodium sulfide, as an inhibitor, has two main functions: firstly, to inhibit the growth of sulfide minerals other than molybdenite in mixed ores; and secondly, to suppress the HS-containing compounds in sodium sulfide. - With S 2- Sodium sulfide can decompose flotation reagents on the surface of sulfide minerals and can adsorb onto the surface of sulfide minerals to enhance their hydrophilicity. Secondly, sodium sulfide has a de-removal effect in mixed pulp because the flotation reagents on the surface of sulfide minerals are reacted by HS- and S-. 2- Analysis.

[0025] The magnetic additive TX01 is mainly used to increase the magnetism of fine-grained weakly magnetic chalcopyrite. Because chalcopyrite becomes extremely fine after multiple grinding stages, its magnetism will also decrease. The magnetic additive itself has a certain degree of magnetism and can combine with chalcopyrite in the slurry and be separated together during the magnetic separation process. The subsequent separation of the magnetic additive from chalcopyrite can be achieved using physical methods.

[0026] The combined use of the strong oxidant hydrogen peroxide and the pH adjuster is to adjust the potential in the copper-molybdenum mixed slurry.

[0027] Numerous experiments were conducted on each pretreatment agent under various conditions, including type and dosage, as shown in Table 1.

[0028] Table 1 Results of the comparative experiment on pharmaceutical agents

[0029]

[0030] As can be seen from the table above, the copper concentrate recovery rate of the combination of inhibitors, magnetizers, strong oxidants, and pH adjusters used in this application is higher than that of other reagents used alone. The magnetic separation process of this application incorporates a series of reagents, including sodium sulfide, hydrogen peroxide, magnetizers, and pH adjusters, in the pretreatment stage of the copper-molybdenum mixed ore. These reagents can effectively separate the copper-molybdenum mixed ore in the slurry; therefore, a wet high-intensity magnetic separator can achieve effective separation of the copper-molybdenum mixed ore slurry.

[0031] Step 3: Feed the copper-molybdenum mixed slurry into a wet high-intensity magnetic separator for copper-molybdenum magnetic separation to obtain copper concentrate and molybdenum concentrate. The strong stirring time of the wet high-intensity magnetic separator is 5-8 minutes, and the magnetic separation intensity of the magnetic separator is greater than or equal to 2.2T.

[0032] Through the above methods, the magnetic separation process of this invention for separating fine-grained copper-molybdenum mixed concentrates solves the problem of easy agglomeration of chalcopyrite and molybdenite by combining the effects of inhibitors, magnetizers, strong oxidants, and modifiers. Since a large amount of washing water is required during the wet high-intensity magnetic separation process, the reagents on the surface of the copper concentrate are washed away by the scouring action of the washing water, achieving a good de-reagent effect. The resulting magnetically separated concentrate is copper concentrate (copper content ≥12%), and the magnetic separation tailings are non-standard molybdenum concentrate, both of which can be directly sold, increasing both product economic benefits and resource utilization.

[0033] Example 1

[0034] The fine-grained copper-molybdenum mixed concentrate includes chalcopyrite, molybdenite, and gangue minerals, with a fineness of -0.038 mm and a proportion of ≥90%. The degree of liberation of chalcopyrite and molybdenite is ≥90%. The molybdenum grade in the copper-molybdenum mixed dry ore is 15%–20%, and the copper grade is 3%–7%.

[0035] Step 1: Place the fine-grained copper-molybdenum mixed concentrate in a high-frequency furnace and roast and deoil it at 230°C to obtain copper-molybdenum mixed dry ore.

[0036] Step 2: Prepare a slurry with a concentration of 15% by mixing copper-molybdenum mixed dry ore and water. Add 1000g / t of sodium sulfide, 500g / t of magnetic agent TX01, and 30ml of hydrogen peroxide to the slurry in sequence at a stirring speed of 1500r / min. Finally, add sodium hydroxide to adjust the pH value to 9. The interval between the additions is 5min to obtain the copper-molybdenum mixed slurry.

[0037] Step 3: The copper-molybdenum mixed slurry is fed into a wet high-intensity magnetic separator with a magnetic separation intensity of 2.2T for copper-molybdenum magnetic separation. The strong stirring time is 10 minutes to obtain copper concentrate and molybdenum concentrate. The experimental results of this embodiment are shown in the table below.

[0038] Table 2 Experimental results at different pulp concentrations

[0039]

[0040] The experimental results show that the optimal magnetic separation pretreatment conditions are: 15% slurry concentration, 1000 g / t sodium sulfide, 500 g / t TX01 magnetizing agent, 30 ml hydrogen peroxide, and 9 slurry pH.

[0041] Example 2

[0042] Step 1: Place the fine-grained copper-molybdenum mixed concentrate in a high-frequency furnace and roast and deoil it at 200-250℃ to obtain copper-molybdenum mixed dry ore;

[0043] Step 2: Prepare a slurry with a concentration of 15% by mixing copper-molybdenum mixed dry ore and water. Add 1000g / t of sodium thioglycolate, 500g / t of magnetic agent TX01, and 30ml of hydrogen peroxide to the slurry in sequence at a stirring speed of 1500r / min. Finally, add sodium hydroxide to adjust the pH value to 9. The interval between the additions is 5min to obtain the copper-molybdenum mixed slurry.

[0044] Step 3: The copper-molybdenum mixed slurry is fed into a wet high-intensity magnetic separator with a magnetic separation intensity of 2.2T for copper-molybdenum magnetic separation. The strong stirring time is 10 minutes to obtain copper concentrate and molybdenum concentrate. The experimental results of this embodiment are shown in the table below.

[0045] Table 3. Experimental results of sodium thioacetate reagent.

[0046]

[0047] In this embodiment, compared with Example 1, sodium thioacetate was used to replace sodium sulfide in the pretreatment agent for conditional experiments. The experimental results show that the yield, grade and recovery rate of copper concentrate obtained by using sodium thioacetate are all lower than those obtained by sodium sulfide.

[0048] Example 3

[0049] Step 1: Place the fine-grained copper-molybdenum mixed concentrate in a high-frequency furnace and roast and deoil it at 230°C to obtain copper-molybdenum mixed dry ore.

[0050] Step 2: Prepare a slurry with a concentration of 15% by mixing copper-molybdenum mixed dry ore and water. Add 1000g / t of sodium sulfide, 500g / t of magnetic agent TX01, and 1000g / t of potassium permanganate to the slurry in sequence at a stirring speed of 1500r / min. Finally, add sodium hydroxide to adjust the pH value to 9. The interval between the additions is 5min to obtain the copper-molybdenum mixed slurry.

[0051] Step 3: The copper-molybdenum mixed slurry is fed into a wet high-intensity magnetic separator with a magnetic separation intensity of 2.2T for copper-molybdenum magnetic separation. The strong stirring time is 10 minutes to obtain copper concentrate and molybdenum concentrate. The experimental results of this embodiment are shown in Table 4.

[0052] Table 4. Experimental results of potassium permanganate reagent.

[0053]

[0054] In this embodiment, compared with Example 1, the hydrogen peroxide in the pretreatment agent was replaced with potassium permanganate for conditional experiments. The experimental results show that the copper concentrate yield, grade and recovery rate obtained by using potassium permanganate are all lower than those obtained by hydrogen peroxide.

Claims

1. A magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates, characterized in that, Includes the following steps: Step 1: Roast and deoil the fine-grained copper-molybdenum mixed concentrate to obtain copper-molybdenum mixed dry ore; Step 1 is specifically as follows: The fine-grained copper-molybdenum mixed concentrate is placed in a high-frequency furnace and roasted and deoiled at 230°C to obtain copper-molybdenum mixed dry ore; Step 2: Prepare a slurry by mixing the copper-molybdenum mixed dry ore with water, and add inhibitors, magnetizing agents, strong oxidants and modifiers to the slurry in sequence to obtain the copper-molybdenum mixed slurry; The inhibitor is sodium sulfide, used at a dosage of 1000~2000 g / t; the magnetizing agent is TX01, used at a dosage of 500~1000 g / t; the strong oxidizing agent is hydrogen peroxide, used at a dosage of 1000~2000 g / t; the adjusting agent is sodium hydroxide, used to adjust the pH value to 9~11. Step 3: The copper-molybdenum mixed slurry is fed into a wet high-intensity magnetic separator for copper-molybdenum magnetic separation to obtain copper concentrate and molybdenum concentrate.

2. The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates according to claim 1, characterized in that, The fine-grained copper-molybdenum mixed concentrate includes chalcopyrite, molybdenite, and gangue minerals.

3. The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates according to claim 2, characterized in that, The fineness of the copper-molybdenum mixed dry ore is -0.038 mm, accounting for more than 90%, and the degree of liberation of both chalcopyrite and molybdenite is greater than or equal to 90%.

4. The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates according to claim 3, characterized in that... The copper-molybdenum mixed dry ore has a molybdenum grade of 15% to 20% and a copper grade of 3% to 7%.

5. The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrate according to claim 1, characterized in that, The slurry concentration is 15-20%.

6. The magnetic separation process for separating fine-grained copper-molybdenum mixed concentrates according to claim 1, characterized in that, The stirring time of the wet high-intensity magnetic separator in step 3 is 5~10 minutes, and the magnetic separation intensity of the magnetic separator is greater than or equal to 2.2T.

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