Beneficiation method for improving recovery rate of low-grade copper-molybdenum ore rich in aluminosilicate gangue

Abstract

The invention relates to a beneficiation method for improving the recovery rate of aluminosilicate-rich gangue low-grade copper-molybdenum ore, and belongs to the technical field of beneficiation, the aluminosilicate-rich gangue low-grade copper-molybdenum ore is treated by adopting a one-roughing, two-sweeping and two-refining flotation process, lime, a collecting agent KMC76, diesel oil and a foaming agent are added into roughing ore pulp, the pH value of the ore pulp is 8-9.5, and the flotation time is 2-3 hours; a collecting agent KMC76, diesel oil and a foaming agent are added in scavenging I, and a collecting agent KMC76 and diesel oil are added in scavenging II. According to the method, the recovery rates of copper and molybdenum are respectively improved by 3.09% and 3.89% or above by adjusting the pH value and using the collecting agent KMC76, the recovery rate of copper is maximally improved to 7.76%, and the recovery rate of molybdenum is maximally improved to 8.37%.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method for improving the recovery rate of low-grade copper-molybdenum ore containing rich aluminum silicate gangue. Background Art

[0002] Copper, a purple-red metal, is one of the earliest non-ferrous metals discovered and utilized by humans. It has been widely used in national economic and social development, second only to iron and aluminum in terms of production. Molybdenum, a silvery-white transition metal, is a relatively recent discovery and a precious, non-renewable rare metal. It is widely used in steel, chemicals, medicine, defense, and other fields. The abundances of copper and molybdenum in the Earth's crust are approximately 0.007% and 0.001%, respectively. According to statistics, approximately 50% of the world's molybdenum resources come from copper-molybdenum ores. Porphyry copper-molybdenum sulfide deposits are characterized by large reserves, low copper and molybdenum grades, fine-grained distribution, complex intergrowth of useful minerals, and significant separation challenges. A copper-molybdenum concentrator in Yunnan Province is a typical porphyry copper-molybdenum deposit. The ore has low copper and molybdenum grades, dense intergrowth of useful minerals, and is rich in aluminosilicate gangue minerals such as potassium feldspar, sodium feldspar, and mica. When the grinding fineness is approximately 0.074 mm, accounting for approximately 60%, the copper and molybdenum metal distribution in the 10μm particle size fraction is nearly 20% or more. -10μm particles are considered fine particles in mineral processing and are commonly referred to as "sludge" or "fine mud." Mineral particles of this size have special physical and chemical properties during the mineral processing process, which have a significant impact on the mineral processing process and indicators. Fine-grained mineral particles are prone to forming fine mud during the flotation process, which increases adhesion and agglomeration during the flotation process, resulting in reduced flotation efficiency. At the same time, fine mud particles are difficult to effectively combine with bubbles, thereby reducing the recovery rate of the target mineral. The copper-molybdenum collectors used in existing production processes mostly use butyl xanthate and ethyl xanthate. Some domestic companies also use imported collectors, but these collectors have poor collection performance. After production and use, the copper collection rate is low, making it difficult to achieve efficient recovery of copper and molybdenum metals. Summary of the Invention

[0003] In order to overcome the problems existing in the background technology, the present invention provides a mineral processing method for improving the recovery rate of low-grade copper-molybdenum ore rich in aluminum silicate gangue. By adjusting the flotation pH value and combining the use of a flotation agent, neutral oil is used to enhance the foam agglomeration of fine mineral particles, thereby improving the copper-molybdenum yield. The flotation process is simple and easy to operate, the process is highly stable, and the fine particle capture effect is good, thereby achieving efficient and comprehensive recovery and utilization of copper and molybdenum resources.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions: The mineral processing method for improving the recovery rate of low-grade copper-molybdenum ore rich in aluminum silicate gangue adopts a one-roughing, two-sweeping, two-fine flotation process, wherein lime, collector KMC76, diesel and a frother are added to the roughing slurry, and the slurry pH is 8-9.5; the collector KMC76 is a mixture of n-propyl xanthate formate, isopropyl naphthalene and ethylene glycol ether.

[0005] Furthermore, collector KMC76, diesel and foaming agent were added in scavenging I; collector KMC76 and diesel were added in scavenging II.

[0006] Furthermore, the collector KMC76 is an emulsion of n-propyl xanthate, isopropyl naphthalene formate and ethylene glycol ether in a mass ratio of 0.5-0.8:0.3-0.5:0.1-0.3.

[0007] Furthermore, the ore dressing method for improving the recovery rate of low-grade copper-molybdenum ore rich in aluminum silicate gangue comprises the following steps: (1) Grinding, the grinding fineness is -0.075mm accounting for 60%-65%; (2) Roughing: adding lime, collector KMC76, diesel and foaming agent to the pulp to carry out mixed roughing of copper and molybdenum; roughing concentrate a1 and roughing tailings b are obtained; (3) The roughing tailings b in step (2) enter the scavenging I, where collector KMC76, diesel and foaming agent are added to obtain a scavenged concentrate a2 and a scavenged tailings c; (4) The first sweep tailing c in step (3) enters sweeping II, where collector KMC76 and diesel are added to separate the second sweep concentrate a3 and tailings, and the second sweep concentrate a3 returns to step (3); (5) The rougher concentrate a1 in step (2) is concentrated and then re-ground to a fineness of 85%-95%-0.038mm; (6) After the regrinding in step (5), a1 enters the selection I, where collector KMC76, diesel and foaming agent are added to separate the concentrate I a4 and the tailings I e. The tailings I e and the sweep concentrate a2 are returned to step (2); (7) The concentrate a4 of step (6) enters the concentrate II, blank selection, and selects the molybdenum-copper concentrate and the concentrate II tailings f, which returns to step (6).

[0008] Furthermore, lime is used to adjust the pulp flotation environment to increase the pulp pH to 8-9.5, with a lime dosage of 300-600 g / t; a collector KMC76 dosage of 40-100 g / t; a diesel dosage of 10-30 g / t; and a foaming agent dosage of 20-40 g / t.

[0009] Furthermore, in step (3), the amount of KMC76 used is 0-40 g / t, the amount of diesel used is 10-20 g / t, and the amount of foaming agent used is 10-20 g / t; in step (4), the amount of collector KMC76 used is 5-10 g / t, and the amount of diesel used is 0-10 g / t; in step (6), the amount of KMC76 used is 10-20 g / t, the amount of diesel used is 10-20 g / t, and the amount of foaming agent used is 5-10 g / t.

[0010] Furthermore, the foaming agent is methyl isobutyl carbinol.

[0011] Beneficial effects of the present invention: This method addresses the fine-grained and micro-fine distribution of target minerals in low-grade copper-molybdenum ores with aluminosilicate-rich gangue. By adding lime during roughing to adjust the slurry pH to 8-9.5, the surface charge of the minerals is optimized, promoting interaction between the mineral surface and the flotation reagents. Furthermore, the use of the KMC76 collector enhances the capture of target minerals, strengthens the recovery of low-grade copper and molybdenum resources, and improves mineral processing efficiency. Neutral diesel fuel enhances the agglomeration of fine mineral particles and the recovery of fine-grained and micro-fine molybdenum mineral particles, significantly improving the recovery rate of copper and molybdenum resources.

[0012] The present invention uses a one-roughing, two-sweeping, two-fining process to flotate low-grade copper-molybdenum ore rich in aluminum silicate gangue, combines the selection and use of flotation agents, and uses a shorter flotation process to improve the yield of copper and molybdenum in the low-grade copper-molybdenum ore rich in aluminum silicate gangue, thereby solving the problems of low copper mineral recovery rate in existing flotation processes and loss of fine-grained and micro-fine molybdenum mineral particles in tailings due to an excessively high proportion of -10μm particles after grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flotation process schematic diagram of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and beneficial effects of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0015] The ore dressing method for improving the recovery rate of low-grade copper-molybdenum ore rich in aluminum silicate gangue comprises the following steps: (1) Grind the raw ore to a grinding fineness of -0.075mm, accounting for 60%-65%.

[0016] Lime, collector KMC76 (an emulsion of n-propyl xanthate formate: isopropyl naphthalene: glycol ether (0.5-0.8%): (0.3-0.5%): (0.1-0.3%)), diesel, and a frother (methyl isobutyl carbinol) are added to the slurry for mixed copper and molybdenum roughing. Lime adjusts the flotation environment to raise the slurry pH to 8-9.5, with a lime dosage of 300-600g / t. Collector KMC76 effectively enhances the recovery of low-grade copper and molybdenum resources, with a KMC76 dosage of 40-100g / t. Diesel fuel enhances the agglomeration of fine mineral particles, effectively improving copper and molybdenum resource recovery. Diesel dosages of 10-30g / t and frother dosages of 20-40g / t are used to separate a1 and b.

[0017] Step (2) b enters scavenging I, adds collector KMC76 20-40g / t, diesel 10-20g / t, and foaming agent 10-20g / t, and selects a2 and c.

[0018] In step (3), c enters scavenging II, adds collector KMC76 5-10g / t and diesel 0-10g / t, separates a3 and tailings, and a3 returns to step (3), and the tailings are discarded.

[0019] The a1 in step (2) is concentrated and then ground again, with a grinding fineness of 85%-95%-0.038mm.

[0020] In step (5), the reground a1 enters the selection I, where 10-20 g / t of collector KMC76, 10-20 g / t of diesel, and 5-10 g / t of foaming agent are added to separate a4 and e. e and a2 are returned to step (2).

[0021] a4 of step (6) enters concentration II, blank concentration, selects molybdenum-containing copper concentrate and f, and f returns to step (6).

[0022] In order to illustrate the present invention more clearly, the following examples are given to illustrate it in detail. Example 1

[0023] A low-grade copper-molybdenum ore with rich aluminosilicate gangue, containing 0.29% Cu and 0.011% Mo, with aluminosilicate orthoclase gangue content of 51.87% in the mineral composition, was processed as follows: (1) The first stage grinding fineness is -0.074mm, accounting for 63%, and the distribution rates of copper and molybdenum in the -10μm particle size are 24.28% and 24.99%.

[0024] (2) Lime, collector KMC76 (an emulsion of n-propyl xanthate, isopropyl formate, isopropyl naphthalene and glycol ether in a mass ratio of 0.6:0.3:0.1), diesel and foaming agent were added to the slurry for rough selection. The concentration of lime was 300 g / t, collector was 60 g / t, diesel was 20 g / t and foaming agent was 30 g / t to separate a1 and b.

[0025] (3) b in step (2) enters scavenging I, adds 20 g / t of collector KMC76 (same as step (2)), 10 g / t of diesel, and 15 g / t of foaming agent, and selects a2 and c.

[0026] (4) c in step (3) enters scavenging II, adds collector KMC76 (same as step (2)) 10g / t, diesel 10g / t, separates a3 and tailings, a3 returns to step (3), and the tailings are discarded.

[0027] (5) The a1 in step (1) is concentrated and then ground again, with a grinding fineness of 90%-0.038mm.

[0028] (6) After regrinding in step (5), a1 enters selection I, where 10 g / t of collector KMC76 (same as step (2)), 10 g / t of diesel, and 10 g / t of foaming agent are added to separate a4 and e. e and a2 are returned to step (2).

[0029] (7) a4 in step (6) enters concentration II, and blank concentration is performed without adding any reagents, and molybdenum-containing copper concentrate and f are separated. f returns to step (6). The molybdenum-containing copper concentrate has a copper grade of 20.51%, a copper recovery rate of 82.21%, a molybdenum grade of 0.92%, and a molybdenum recovery rate of 86.17%. Under the same process, compared with the collectors of butyl xanthate or ethyl xanthate, the copper recovery rate is increased by about 1.54 percentage points, and the molybdenum recovery rate is increased by about 4.25 percentage points. Example 2

[0030] A low-grade copper-molybdenum ore with rich aluminosilicate gangue, Cu 0.22%, Mo 0.013%, and aluminosilicate orthoclase gangue content of 53.58% in the mineral composition, was processed as follows: (1) The first stage grinding fineness is -0.074mm, accounting for 63%, and the distribution rates of copper and molybdenum in the -10μm particle size are 26.44% and 18.98%.

[0031] (2) Lime, collector KMC76 (an emulsion of n-propyl xanthate, isopropyl naphthalene formate and glycol ether in a mass ratio of 0.8:0.1:0.1), diesel and foaming agent were added to the slurry for rough selection. The concentration of lime was 400 g / t, collector was 80 g / t, diesel was 20 g / t and foaming agent was 40 g / t to separate a1 and b.

[0032] (3) b in step (2) enters scavenging I, adds 30 g / t of collector KMC76 (same as step (2)), 10 g / t of diesel, and 20 g / t of foaming agent, and selects a2 and c.

[0033] (4) c in step (3) enters scavenging II, adds collector KMC76 (same as step (2)) 15g / t, diesel 10g / t, separates a3 and tailings, a3 returns to step (3), and tailings are discarded.

[0034] (5) The a1 in step (1) is concentrated and then ground again to a fineness of 95%-0.038 mm.

[0035] (6) After regrinding in step (5), a1 enters selection I, where 20 g / t of collector KMC76 (same as step (2)), 15 g / t of diesel, and 10 g / t of foaming agent are added to separate a4 and e. e and a2 are returned to step (2).

[0036] (7) Step (6) a4 enters concentration II and performs blank concentration without adding any reagents, separating the molybdenum-containing copper concentrate and f, which then returns to step (6). The molybdenum-containing copper concentrate has a copper grade of 20.16%, a copper recovery rate of 75.85%, a molybdenum grade of 1.40%, and a molybdenum recovery rate of 86.73%. Under the same process, compared with the imported collector used by the applicant's company (due to technical secrets that cannot be disclosed), the copper recovery rate increased by 3.09 percentage points and the molybdenum recovery rate increased by 8.37 percentage points. Example 3

[0037] A low-grade copper-molybdenum ore with rich aluminosilicate gangue, containing 0.34% Cu and 0.007% Mo, with aluminosilicate orthoclase gangue content of 51.49% in the mineral composition, was processed as follows: (1) The first stage grinding fineness is -0.074mm, accounting for 80%, and the distribution rate of copper and molybdenum in the -10μm particle size is 27.68% and 26.46%.

[0038] (2) Lime, collector KMC76 (an emulsion of n-propyl xanthate, isopropyl naphthalene formate and glycol ether in a mass ratio of 0.5:0.3:0.2), diesel and foaming agent were added to the slurry for rough selection. The concentration of lime was 600 g / t, collector was 100 g / t, diesel was 20 g / t and foaming agent was 40 g / t to separate a1 and b.

[0039] (3) b in step (2) enters scavenging I, adds 30 g / t of collector KMC76 (same as step (2)), 10 g / t of diesel, and 20 g / t of foaming agent, and selects a2 and c.

[0040] (4) In step (3), c enters scavenging II, adds collector KMC76 (same as step (2)) 10g / t, diesel 5g / t, separates a3 and tailings, a3 returns to step (3), and the tailings are discarded.

[0041] (5) The a1 in step (1) is concentrated and then ground again, with a grinding fineness of 94%-0.038mm.

[0042] (6) After regrinding in step (5), a1 enters selection I, where 20 g / t of collector KMC76 (same as step (2)), 10 g / t of diesel, and 10 g / t of foaming agent are added to separate a4 and e. e and a2 are returned to step (2).

[0043] (7) a4 in step (6) enters concentration II, and blank concentration is performed without adding any reagents, and molybdenum-containing copper concentrate and f are separated. f returns to step (6). The molybdenum-containing copper concentrate has a copper grade of 21.52%, a copper recovery rate of 84.60%, a molybdenum grade of 0.55%, and a molybdenum recovery rate of 78.90%. Under the same process, compared with the collectors of butyl xanthate or ethyl xanthate, the copper recovery rate is increased by about 7.76 percentage points, and the molybdenum recovery rate is increased by about 3.89 percentage points.

[0044] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A mineral processing method for improving the recovery rate of low-grade copper-molybdenum ore rich in aluminum silicate gangue, characterized in that: A one-roughing, two-sweeping, two-fine flotation process is used, wherein lime, collector KMC76, diesel and frother are added to the roughing pulp, and the pulp pH is 8-9.5; The collector KMC76 is a mixture of n-propyl xanthate formate, isopropyl naphthalene and ethylene glycol ether.

2. The method according to claim 1, characterized in that In scavenging I, collector KMC76, diesel and foaming agent were added; in scavenging II, collector KMC76 and diesel were added.

3. The method according to claim 1 or 2, characterized in that The collector KMC76 is an emulsion of n-propyl xanthate, isopropyl naphthalene formate and ethylene glycol ether in a mass ratio of 0.5-0.8:0.3-0.5:0.1-0.

3.

4. The method according to claim 3, characterized in that The following steps are involved: (1) Grinding, the grinding fineness is -0.075mm accounting for 60%-65%; (2) Roughing: adding lime, collector KMC76, diesel and foaming agent to the pulp to carry out mixed roughing of copper and molybdenum; roughing concentrate a1 and roughing tailings b are obtained; (3) The roughing tailings b in step (2) enter the scavenging I, where collector KMC76, diesel and foaming agent are added to obtain a scavenged concentrate a2 and a scavenged tailings c; (4) The first sweep tailing c in step (3) enters sweeping II, where collector KMC76 and diesel are added to separate the second sweep concentrate a3 and tailings, and the second sweep concentrate a3 returns to step (3); (5) The rougher concentrate a1 in step (2) is concentrated and then re-ground to a fineness of 85%-95%-0.038mm; (6) After the regrinding in step (5), a1 enters the selection I, where collector KMC76, diesel and foaming agent are added to separate the concentrate I a4 and the tailings I e. The tailings I e and the sweep concentrate a2 are returned to step (2); (7) The concentrate a4 of step (6) enters the concentrate II, blank selection, and selects the molybdenum-copper concentrate and the concentrate II tailings f, which returns to step (6).

5. The method according to claim 4, characterized in that In step (2), lime is used to adjust the pulp flotation environment to increase the pulp pH value to 8-9.5, the amount of lime used is 300-600 g / t; the amount of collector KMC76 used is 40-100 g / t; the amount of diesel used is 10-30 g / t; and the amount of foaming agent used is 20-40 g / t.

6. The method according to claim 4, characterized in that In step (3), the amount of KMC76 is 0-40 g / t, the amount of diesel is 10-20 g / t, and the amount of foaming agent is 10-20 g / t; in step (4), the amount of collector KMC76 is 5-10 g / t, and the amount of diesel is 0-10 g / t; in step (6), the amount of KMC76 is 10-20 g / t, the amount of diesel is 10-20 g / t, and the amount of foaming agent is 5-10 g / t.

7. The method according to claim 4, characterized in that The foaming agent is methyl isobutyl carbinol.

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