Method for improving copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore

Abstract

The invention discloses a method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulphide ore. The method comprises the steps of copper-nickel sulphide ore pulp mixing and dosing, ore grinding, mixed roughing, secondary mixed concentration, roughing tailing and middling regrinding and reconcentration and the like. The method for improving the copper-nickel flotation recovery rate of the low-grade copper-nickel sulfide ore is developed for solving the problems that the flotation recovery rate of the low-grade copper-nickel sulfide ore is difficult to improve, and an existing reagent system is complex. According to the method, the efficient recovery rate of low-grade copper-nickel sulfide ore metal resources is achieved, the recovery rate of copper and nickel is remarkably increased, and the production cost is reduced for follow-up operation.

Description

[0001] This application is a divisional application. The original application has an invention title of "A Method for Improving the Copper-Nickel Flotation Recovery Rate of Low-Grade Copper-Nickel Sulfide Ores", an application number of 202211189754.7, and an application date of September 28, 2022. Technical Field

[0002] The present invention relates to the technical field of mineral processing, and specifically relates to a method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ores. Background Art

[0003] Nickel and copper are two very important metal raw materials and also important strategic reserve materials in China, which can meet the extensive production needs of national enterprises. Copper-nickel sulfide ores are important sources of nickel and copper. Most of the large copper-nickel sulfide deposits in China are polymetallic composite sulfide deposits, which have the characteristics of fine dissemination size and complex symbiotic relationship. In recent years, with the continuous deepening of ore mining, the grades of copper and nickel raw ores have dropped sharply, and the content of magnesium-bearing gangue minerals has increased. It is difficult to effectively recover copper and nickel metals using existing technologies. Therefore, how to realize the comprehensive utilization of low-grade copper-nickel sulfide ore resources has become an urgent problem to improve the economic benefits of copper-nickel mining enterprises in China and promote the sustainable development of mining enterprises.

[0004] The patent with the publication number CN110976074B provides a beneficiation method for low-grade copper-nickel sulfide ores. By setting two-stage grinding and flotation, using a mixture of pine oil and dodecylamine as the frother and superhydrophobic polyurethane nano-ions as the collector, the gangue minerals can be effectively removed, and the flotation effect of copper-nickel minerals can be strengthened, improving the grade of copper-nickel mixed concentrate. However, this method has a long process and cumbersome steps, which affects the stability of the separation process indicators. At the same time, the influence of slimes such as serpentine on the nano-collector has not been investigated, and the nano-grade raw materials are expensive, with limited application value.

[0005] In view of this, there is still a need to develop a suitable method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ores, so as to provide comprehensive indicators of copper-nickel mixed concentrate of low-grade copper-nickel sulfide ores. Summary of the Invention

[0006] In view of the above deficiencies currently existing, the present invention provides a method for improving the copper-nickel flotation recovery rate of high- and low-grade copper-nickel sulfide ores. In view of the problems such as the difficult improvement of the flotation recovery rate of low-grade copper-nickel sulfide ores and the complex existing reagent systems, the present invention has developed a method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ores. The present invention realizes the high-efficiency recovery rate of metal resources of low-grade copper-nickel sulfide ores, significantly improves the copper and nickel recovery rates, and reduces the production cost for subsequent operations.

[0007] To achieve the above object, the present invention provides a method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore, comprising the following steps:

[0008] Step 1: Add a regulator to the raw copper-nickel sulfide ore and grind it to obtain a raw pulp;

[0009] Step 2: Sequentially add an inhibitor and a collector to the raw pulp and mix them to perform the first rough selection of copper-nickel to obtain a first rough concentrate and a first tailing;

[0010] Step 3: Add an inhibitor to the first rough concentrate and mix them to perform the first cleaning of copper-nickel to obtain a second rough concentrate and a first middling;

[0011] Step 4: Add an inhibitor to the second rough concentrate and mix them to perform the second cleaning of copper-nickel to obtain a high-grade concentrate;

[0012] Step 5: Mix the first tailing and the first middling, add a regulator and perform re-grinding to obtain a second pulp;

[0013] Step 6: Sequentially add an inhibitor and a collector to the second pulp and mix them to perform the second rough selection of copper-nickel to obtain a third rough concentrate and a final tailing;

[0014] Step 7: Add an inhibitor to the third rough concentrate and mix them to perform the third cleaning of copper-nickel to obtain a fourth rough concentrate;

[0015] Step 8: Add an inhibitor to the fourth rough concentrate and mix them to perform the fourth cleaning of copper-nickel to obtain a low-grade concentrate;

[0016] Step 9: Mix the high-grade concentrate and the low-grade concentrate to obtain a copper-nickel mixed concentrate.

[0017] According to one aspect of the present invention, in the step 1, the content of particles with a fineness of -74um after grinding is greater than 75%.

[0018] According to one aspect of the present invention, the regulator includes at least one of copper sulfate with an addition amount of 50-100g / t, ammonium sulfate with an addition amount of 70-150g / t, and zinc sulfate with an addition amount of 20-50g / t.

[0019] According to one aspect of the present invention, in the step 2 and step 6, the inhibitor includes at least one of calcium fluoride with an addition amount of 100-200g / t, sodium fluoride with an addition amount of 100-200g / t, and potassium fluoride with an addition amount of 100-200g / t.

[0020] According to one aspect of the present invention, in the step 3 and step 7, the inhibitor includes at least one of calcium fluoride with an addition amount of 50-100 g / t, sodium fluoride with an addition amount of 50-100 g / t, and potassium fluoride with an addition amount of 50-100 g / t.

[0021] According to one aspect of the present invention, in the step 4 and step 8, the inhibitor includes at least one of calcium fluoride with an addition amount of 20-50 g / t, sodium fluoride with an addition amount of 20-50 g / t, and potassium fluoride with an addition amount of 20-50 g / t.

[0022] According to one aspect of the present invention, the collector includes sodium butyl xanthate, O-isopropyl-N-ethyl thionocarbamate, and ammonium dibutyldithiophosphate.

[0023] According to one aspect of the present invention, the addition amount of sodium butyl xanthate is 100-200 g / t; the addition amount of O-isopropyl-N-ethyl thionocarbamate is 20-50 g / t; the addition amount of ammonium dibutyldithiophosphate is 10-30 g / t.

[0024] According to one aspect of the present invention, in the step 5, the fineness after regrinding is that the content of particles with a size of -74 um is greater than 93%.

[0025] According to one aspect of the present invention, the original sulfide copper-nickel ore is specifically formed by adding water to the sulfide copper-nickel ore for pulp preparation.

[0026] The beneficial effects of the present invention:

[0027] (1) In this application, a regulator is added before grinding. Any one of the Cu2+, NH+, and Zn2+ ions generated by the hydrolysis of the regulator can combine with the surface of the sulfide copper-nickel to form corresponding activation products, which is beneficial to grinding and the subsequent combination of copper-nickel ore with the collector, effectively improving the flotation environment of the bulk rougher flotation; the first tailings are reground, so that the refractory copper-nickel minerals in the first tailings are further monomerized and relayed, improving the comprehensive recovery rate of copper and nickel;

[0028] (2) In this application, the strongly charged fluoride ions generated by the hydrolysis of the inhibitor preferentially flocculate and hydrophilize the magnesium-containing gangue minerals, and the combined reagents of sodium butyl xanthate, O-isopropyl-N-ethyl thionocarbamate, and ammonium dibutyldithiophosphate are used to effectively enrich copper and nickel metals, so as to achieve the purpose of separating copper-nickel minerals from gangue minerals;

[0029] (3) The process of the present invention is short, easy to operate, the reagent system is simple, the dosage of reagents is small, and the cost is low, which is beneficial to actual production. Description of the Drawings

[0030] Figure 1Flow chart of a method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore according to an embodiment of the present invention. Detailed implementation manners

[0031] To make the present invention easier to understand, the present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention. Unless otherwise defined, the professional terms used hereinafter have the same meaning as understood by those of ordinary skill in the art; unless otherwise specified, the raw materials and reagents involved in this article can be purchased from the market or prepared by well-known methods.

[0032] A method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore, as Figure 1 shown, specifically includes the following steps:

[0033] Step 1: Add an adjusting agent to the original copper-nickel sulfide ore and grind it to obtain the original pulp; wherein, the original copper-nickel sulfide ore is specifically the copper-nickel sulfide ore adjusted with water to form a pulp; the fineness after grinding is such that the content of particles with a size of -74um is greater than 75%; the adjusting agent includes at least one of copper sulfate with an addition amount of 50-100g / t, ammonium sulfate with an addition amount of 70-150g / t, and zinc sulfate with an addition amount of 20-50g / t;

[0034] Step 2: Add an inhibitor and a collector to the original pulp in sequence and mix them to perform the first rough selection of copper and nickel to obtain the first rough concentrate and the first tailings; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 100-200g / t, sodium fluoride with an addition amount of 100-200g / t, and potassium fluoride with an addition amount of 100-200g / t; the collector includes sodium butyl xanthate, O-isopropyl-N-ethyl thionocarbamate, and ammonium dibutyl dithiophosphate; preferably, the addition amount of sodium butyl xanthate is 100-200g / t; the addition amount of O-isopropyl-N-ethyl thionocarbamate is 20-50g / t; the addition amount of ammonium dibutyl dithiophosphate is 10-30g / t;

[0035] Step 3: Add an inhibitor to the first rough concentrate and mix them to perform the first cleaning of copper and nickel to obtain the second rough concentrate and the first middlings; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 50-100g / t, sodium fluoride with an addition amount of 50-100g / t, and potassium fluoride with an addition amount of 50-100g / t;

[0036] Step 4: Add an inhibitor to the second roughly selected concentrate and mix them to perform the second stage of copper-nickel beneficiation to obtain a high-grade concentrate; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 20-50 g / t, sodium fluoride with an addition amount of 20-50 g / t, and potassium fluoride with an addition amount of 20-50 g / t;

[0037] Step 5: Mix the first tailings and the first middlings, add a regulator and perform regrinding to obtain a second pulp; wherein, the regulator includes at least one of copper sulfate with an addition amount of 50-100 g / t, ammonium sulfate with an addition amount of 70-150 g / t, and zinc sulfate with an addition amount of 20-50 g / t; the fineness after regrinding is that the content of particles with a size of -74 um is greater than 93%;

[0038] Step 6: Sequentially add an inhibitor and a collector to the second pulp and mix them to perform the second stage of copper-nickel rough beneficiation to obtain a third roughly selected concentrate and final tailings; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 100-200 g / t, sodium fluoride with an addition amount of 100-200 g / t, and potassium fluoride with an addition amount of 100-200 g / t; the collector includes sodium butyl xanthate, O-isopropyl-N-ethyl thionocarbamate, and ammonium dibutyl dithiophosphate; preferably, the addition amount of sodium butyl xanthate is 100-200 g / t; the addition amount of O-isopropyl-N-ethyl thionocarbamate is 20-50 g / t; the addition amount of ammonium dibutyl dithiophosphate is 10-30 g / t;

[0039] Step 7: Add an inhibitor to the third roughly selected concentrate and mix them to perform the third stage of copper-nickel beneficiation to obtain a fourth roughly selected concentrate; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 50-100 g / t, sodium fluoride with an addition amount of 50-100 g / t, and potassium fluoride with an addition amount of 50-100 g / t;

[0040] Step 8: Add an inhibitor to the fourth roughly selected concentrate and mix them to perform the fourth stage of copper-nickel beneficiation to obtain a low-grade concentrate; wherein, the inhibitor includes at least one of calcium fluoride with an addition amount of 20-50 g / t, sodium fluoride with an addition amount of 20-50 g / t, and potassium fluoride with an addition amount of 20-50 g / t;

[0041] Step 9: Mix the high-grade concentrate and the low-grade concentrate to obtain a copper-nickel mixed concentrate.

[0042] It should be noted that the unit "g / t" of the addition amounts of the regulator, inhibitor, and collector in this application represents the number of grams of the regulator, inhibitor, or collector added per ton of copper-nickel sulfide ore.

[0043] Example 1

[0044] A method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore, comprising the following steps:

[0045] Step 1: After adding water to the copper-nickel sulfide ore to adjust the pulp, add 100 g / t of copper sulfate and 150 g / t of ammonium sulfate, and then perform ball milling for grinding (the fineness after grinding is that the content of particles with a size of -74 um is greater than 75%) to obtain the original pulp;

[0046] Step 2: Sequentially add 200 g / t of calcium fluoride to the original pulp, and after mixing, add 200 g / t of sodium butyl xanthate, 50 g / t of O-isopropyl-N-ethyl thionocarbamate, and 30 g / t of ammonium dibutyldithiophosphate to it. After mixing, perform the first rough selection of copper and nickel to obtain the first rough concentrate and the first tailings;

[0047] Step 3: Add 100 g / t of calcium fluoride to the first rough concentrate and mix it, and perform the first cleaning of copper and nickel to obtain the second rough concentrate and the first middlings;

[0048] Step 4: Add 50 g / t of calcium fluoride to the second rough concentrate and mix it, and perform the second cleaning of copper and nickel to obtain a high-grade concentrate;

[0049] Step 5: Mix the first tailings and the first middlings, add 50 g / t of copper sulfate and 75 g / t of ammonium sulfate and perform re-grinding (the fineness after re-grinding is that the content of particles with a size of -74 um is greater than 93%) to obtain the second pulp;

[0050] Step 6: Sequentially add 200 g / t of calcium fluoride to the second pulp, and after mixing, add 200 g / t of sodium butyl xanthate, 50 g / t of O-isopropyl-N-ethyl thionocarbamate, and 30 g / t of ammonium dibutyldithiophosphate to it. After mixing, perform the second rough selection of copper and nickel to obtain the third rough concentrate and the final tailings;

[0051] Step 7: Add 100 g / t of calcium fluoride to the third rough concentrate and mix it, and perform the third cleaning of copper and nickel to obtain the fourth rough concentrate;

[0052] Step 8: Add 50 g / t of calcium fluoride to the fourth rough concentrate and mix it, and perform the fourth cleaning of copper and nickel to obtain a low-grade concentrate;

[0053] Step 9: Mix the high-grade concentrate and the low-grade concentrate to obtain a copper-nickel mixed concentrate.

[0054] Through the above method of this example, the copper-nickel mixed concentrate contains 7.73% nickel, the nickel recovery rate is 72.94%, contains 4.53% copper, the copper recovery rate is 64.92%, and contains 6.00% magnesium oxide.

[0055] Example 2

[0056] A method for improving the copper-nickel flotation recovery rate of low-grade copper-nickel sulfide ore, comprising the following steps:

[0057] Step 1: After adding water to the copper-nickel sulfide ore to adjust the pulp, add 100 g / t of copper sulfate and 50 g / t of zinc sulfate, and then perform ball milling for grinding (the particle content with a fineness of -74 μm after grinding is greater than 75%) to obtain the original pulp;

[0058] Step 2: Add 200 g / t of sodium fluoride to the original pulp in sequence. After mixing, add 200 g / t of sodium butyl xanthate, 50 g / t of O-isopropyl-N-ethyl thionocarbamate, and 30 g / t of ammonium dibutyldithiophosphate to it. After mixing, perform rough selection I of copper and nickel to obtain the first rough concentrate and the first tailings;

[0059] Step 3: Add 100 g / t of sodium fluoride to the first rough concentrate and mix, and perform cleaning I of copper and nickel to obtain the second rough concentrate and the first middlings;

[0060] Step 4: Add 50 g / t of sodium fluoride to the second rough concentrate and mix, and perform cleaning II of copper and nickel to obtain high-grade concentrate;

[0061] Step 5: Mix the first tailings and the first middlings, add 50 g / t of copper sulfate and 25 g / t of zinc sulfate and perform re-grinding (the particle content with a fineness of -74 μm after re-grinding is greater than 93%) to obtain the second pulp;

[0062] Step 6: Add 200 g / t of sodium fluoride to the second pulp in sequence. After mixing, add 200 g / t of sodium butyl xanthate, 50 g / t of O-isopropyl-N-ethyl thionocarbamate, and 30 g / t of ammonium dibutyldithiophosphate to it. After mixing, perform rough selection II of copper and nickel to obtain the third rough concentrate and the final tailings;

[0063] Step 7: Add 100 g / t of sodium fluoride to the third rough concentrate and mix, and perform cleaning III of copper and nickel to obtain the fourth rough concentrate;

[0064] Step 8: Add 50 g / t of sodium fluoride to the fourth rough concentrate and mix, and perform cleaning IV of copper and nickel to obtain low-grade concentrate;

[0065] Step 9: Mix the high-grade concentrate and the low-grade concentrate to obtain copper-nickel mixed concentrate.

[0066] The copper-nickel mixed concentrate obtained by the above method of this embodiment contains 6.69% nickel, the nickel recovery rate is 71.90%, contains 4.31% copper, the copper recovery rate is 63.68%, and contains 6.25% magnesium oxide.

[0067] Comparative Example 1

[0068] The difference between the comparative example and Example 1 is that no modifier is added in Steps 1 and 5, but ball milling is directly carried out, and other operations are the same as those in Example 1.

[0069] The copper-nickel mixed concentrate obtained by the above method of the comparative example contains 4.58% nickel, the nickel recovery rate is 62.1%, contains 3.05% copper, the copper recovery rate is 52.4%, and contains 8.62% magnesium oxide.

[0070] As mentioned above, it is only the 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 thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for copper-nickel flotation of low-grade copper-nickel sulfide ore, characterized in that, It includes the following steps: Step 1: Add a regulator to the original copper-nickel sulfide ore and grind it to obtain the original pulp; Step 2: Sequentially add an inhibitor and a collector to the original pulp and mix them, and perform the first rough selection of copper and nickel to obtain the first rough concentrate and the first tailings; Step 3: Add an inhibitor to the first rough concentrate and mix them, and perform the first cleaning of copper and nickel to obtain the second rough concentrate and the first middlings; Step 4: Add an inhibitor to the second rough concentrate and mix them, and perform the second cleaning of copper and nickel to obtain the high-grade concentrate; Step 5: Mix the first tailings and the first middlings, add a regulator and perform re-grinding to obtain the second pulp; Step 6: Sequentially add an inhibitor and a collector to the second pulp and mix them, and perform the second rough selection of copper and nickel to obtain the third rough concentrate and the final tailings; Step 7: Add an inhibitor to the third rough concentrate and mix them, and perform the third cleaning of copper and nickel to obtain the fourth rough concentrate; Step 8: Add an inhibitor to the fourth rough concentrate and mix them, and perform the fourth cleaning of copper and nickel to obtain the low-grade concentrate; Step 9: Mix the high-grade concentrate and the low-grade concentrate to obtain the copper-nickel mixed concentrate; The regulator includes at least one of copper sulfate, ammonium sulfate or zinc sulfate; The inhibitor includes at least one of calcium fluoride, sodium fluoride or potassium fluoride; The collector includes at least one of sodium butyl xanthate, O-isopropyl-N-ethyl thionocarbamate or ammonium dibutyl dithiophosphate.

2. The method according to claim 1, wherein In the said Step 1, the content of particles with a fineness of -74um after grinding is greater than 75%; 3. The method according to claim 1, characterized in that, The addition amount of sodium butyl xanthate is 100-200g / t; the addition amount of O-isopropyl-N-ethyl thionocarbamate is 20-50g / t; the addition amount of ammonium dibutyl dithiophosphate is 10-30g / t.

4. The method according to claim 1, wherein In the said Step 5, the content of particles with a fineness of -74um after re-grinding is greater than 93%.

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