Method for combined beneficiation and smelting of precious metal-containing pyrite concentrate and manganese-containing polymetallic ore

Abstract

The present application relates to the technical field of mineral separation, and particularly discloses a method for combined separation and smelting of a noble metal-containing sulphide concentrate and a manganese-containing polymetallic ore. The method comprises adding the noble metal-containing sulphide concentrate and sulfuric acid to a manganese-containing polymetallic ore slurry, stirring and leaching, and then performing solid-liquid separation to obtain a manganese-rich leaching solution and a leaching residue; the leaching residue is prepared into a leaching residue slurry, a composite collector is added to the leaching residue slurry, and two rough selections are performed to obtain a rough selection concentrate and a rough selection tailing; the composite collector is added to the rough selection tailing, and one scavenging is performed to obtain a low-sulfur iron ore; and the rough selection concentrate is subjected to two blank flotation clean selections to obtain a gold and silver-rich concentrate. The method can realize the collaborative treatment and utilization of the noble metal-containing sulphide concentrate and the manganese-containing polymetallic ore.

Description

Technical Field

[0001] This invention relates to the field of mineral beneficiation technology, and in particular to a method for the combined beneficiation of precious metal sulfur concentrate and manganese polymetallic ore. Background Technology

[0002] Sulfide minerals are important carriers of precious metals (such as gold and silver) in nature, but their gold and silver content is generally low, and the grain size of gold and silver embedded in sulfide minerals is extremely fine, making physical separation very difficult, resulting in high smelting costs and extremely low valuation coefficients. Therefore, the high-value utilization of precious metals (such as gold and silver) in sulfide concentrates is a major challenge in the field of sulfide mineral beneficiation and smelting technology. Typically, the recovery method for precious metals (such as gold and silver) is cyanide leaching, but the use of highly toxic cyanide creates numerous barriers to implementation in engineering applications.

[0003] Manganese polymetallic ores are also a type of difficult-to-process mineral. These ores typically contain multiple valuable elements such as manganese, silver, gold, copper, and iron. These associated metals often exist isomorphously within the crystal lattice of the manganese-iron minerals, making them virtually impossible to separate and purify using physical beneficiation methods. While chemical acid leaching can recover manganese, gold and silver are difficult to leach and recover from manganese polymetallic ores.

[0004] Based on the above problems, the present invention aims to propose a method for the joint beneficiation and smelting of precious metal-containing sulfur concentrate and manganese-containing polymetallic ore, so as to achieve the effective recovery and utilization of precious metals. Summary of the Invention

[0005] The main technical problem solved by this invention is to provide a method for the combined beneficiation and smelting of precious metal sulfur concentrate and manganese polymetallic ore, which can realize the synergistic processing and utilization of precious metal sulfur concentrate and manganese polymetallic ore.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for the combined beneficiation and smelting of precious metal-containing sulfur concentrate and manganese-containing polymetallic ore, comprising the following steps:

[0007] S1: Add precious metal sulfur concentrate and sulfuric acid to the manganese polymetallic ore slurry, stir and leach at 90-95℃, then separate the solid and liquid to obtain manganese-rich leachate and leaching residue respectively.

[0008] S2: The leaching residue is prepared into a leaching residue slurry, and a composite collector is added to the leaching residue slurry. The composite collector includes hydrocarbon dithiophosphate thioether ester, isopentyl xanthate propylene ester and methyl isobutyl methanol. Then, two flotation roughing processes are performed to obtain roughing concentrate 1, roughing concentrate 2 and roughing tailings, respectively.

[0009] S3: The composite collector is added to the roughing tailings for a scavenging process. The scavenged tailings are low-sulfur iron-bearing ore. The scavenged tailings are returned to the previous operation in sequence to form a closed loop.

[0010] The rougher concentrate 1 and rougher concentrate 2 are combined and subjected to two blank flotation cleaning processes to obtain gold and silver rich concentrate. The middlings from the two cleaning processes are returned to the previous stage of operation in sequence to form a closed loop.

[0011] In one embodiment of the present invention, in step S1, the pH value of the reaction system during the stirring leaching process is 1 to 2.

[0012] In one embodiment of the present invention, in step S1, the added sulfuric acid is concentrated sulfuric acid with a mass percentage concentration of 98%.

[0013] In one embodiment of the present invention, in step S1, the amount of precious metal sulfur concentrate added is 60-80 kg per ton of manganese polymetallic ore.

[0014] In one embodiment of the present invention, in step S2, the temperature of the leaching residue slurry is ≥55℃ and the pH value is 2~3.

[0015] As one embodiment of the present invention, the composite collector is a mixture of hydrocarbon dithiophosphate thioether ester, isopentyl xanthate propylene ester and methyl isobutyl methanol, wherein the mass ratio of hydrocarbon dithiophosphate thioether ester, isopentyl xanthate propylene ester and methyl isobutyl methanol is (3-6):(1-3):(0.5-1.5).

[0016] Preferably, in the composite collector, the mass ratio of hydrocarbon dithiophosphate thioether ester, isopentyl xanthate propylene ester, and methyl isobutyl methanol is 5:2:1.

[0017] In one embodiment of the present invention, in step S2, the amount of the composite collector added is 80-100g per ton of manganese polymetallic ore.

[0018] In one embodiment of the present invention, in step S3, the amount of the composite collector added is 40-50g per ton of manganese polymetallic ore.

[0019] In one embodiment of the present invention, the mass percentage concentration of the manganese-containing polymetallic ore slurry is 30-40%.

[0020] In one embodiment of the present invention, the leaching residue is mixed with water to prepare a leaching residue slurry, and the mass percentage concentration of the leaching residue slurry is 28-33%.

[0021] As one embodiment of the present invention, the manganese-containing polymetallic ore has a manganese grade of 3.0-4.5%, a gold grade of 2.8-3.5 g / t, a silver grade of 55-70 g / t, and an iron grade of 40-48%.

[0022] In one embodiment of the present invention, the gold grade in the precious metal sulfur concentrate is 2.0-3.0 g / t, the silver grade is 25-35 g / t, and the sulfur grade is 43-50%.

[0023] This invention provides a method for the combined beneficiation of precious metal-bearing sulfur concentrate and manganese-bearing polymetallic ore. The method involves the co-processing of these two ores to reduce and leach manganese minerals, yielding a manganese-rich leachate. During leaching, the sulfur concentrate generates elemental sulfur. This elemental sulfur, along with the sulfur concentrate itself, acts as a carrier to capture chemically dissociated gold and silver. Under the action of a composite lipid collector, the gold and silver are floated together with the precious metals for recovery, resulting in a gold and silver-rich concentrate. This method not only recovers gold and silver from the sulfur concentrate but also from the manganese polymetallic ore, while simultaneously removing sulfur impurities from the leaching residue, yielding a low-sulfur iron-bearing ore, which is beneficial for further magnetic separation to obtain a high-quality iron concentrate.

[0024] This invention utilizes the reducing chemical properties of gold-silver-bearing sulfur concentrate under heated acidic conditions to achieve the comprehensive utilization of low-grade gold-silver-bearing sulfur concentrate. During acid leaching, manganese minerals are leached out, and the gold and silver encapsulated by the manganese minerals are deeply liberated. By controlling temperature and acidity, elemental sulfur is generated. The elemental sulfur and sulfur concentrate form a carrier with better floatability and larger spatial dimensions, capturing the gold and silver that have lost their carrier. A composite lipid collector is used for roughing, cleaning, and scavenging flotation operations at higher acidity and pulp temperature to obtain rich gold-silver concentrate. The method of this invention can separately obtain manganese-rich leachate, low-sulfur iron-bearing ore, and rich gold-silver concentrate products.

[0025] This invention enables the synergistic and comprehensive utilization of two difficult-to-process mineral resources. During the leaching process, controlled leaching conditions promote both manganese leaching and the formation of secondary carriers for precious metals. In the flotation process, a composite collector is used to address the high-temperature and high-acid environment of the residual heated acid leaching residue, achieving flotation separation of gold and silver. Precious metals are efficiently recovered and enriched, yielding high-quality gold and silver concentrate. Simultaneously, the flotation process removes sulfur-containing impurities, resulting in low-sulfur iron-bearing ore that is more conducive to further magnetic separation to obtain high-quality iron concentrate. Detailed Implementation

[0026] The technical solution of the present invention will be described in detail below through specific embodiments. These embodiments are intended to further illustrate the content of the present invention, but are not intended to limit the scope of protection of the claims of the present invention.

[0027] In the following examples, all pharmaceutical agents used are commercially available products. Unless otherwise specified, all percentages in the examples are by mass.

[0028] It should be noted that in the following embodiments, taking an iron grade of 43.60% as an example means that the mass percentage content of iron is 43.60%.

[0029] In the following examples, a fineness of -0.074 mm accounts for 60%, which means that the mass percentage of minerals with a fineness of less than 0.074 mm in the mineral is 60%.

[0030] Example 1

[0031] This embodiment provides a combined beneficiation method for precious metal-bearing sulfur concentrate and manganese-bearing polymetallic ore. Both the precious metal-bearing sulfur concentrate and the manganese-bearing polymetallic ore are sourced from Yunnan Province. The precious metal-bearing sulfur concentrate has a gold grade of 2.85 g / t, a silver grade of 32.01 g / t, and a sulfur grade of 48.43%. The manganese-bearing polymetallic ore has a manganese grade of 3.92%, a gold grade of 2.91 g / t, a silver grade of 60.47 g / t, and an iron grade of 43.60%. The grinding fineness of the manganese-bearing polymetallic ore is -0.074 mm (60%), and the grinding fineness of the precious metal-bearing sulfur concentrate is -0.043 mm (80%).

[0032] The process includes the following steps:

[0033] S1: Prepare a manganese polymetallic ore slurry with water to a concentration of 35% by mass. Add precious metal sulfur concentrate and concentrated sulfuric acid with a concentration of 98% by mass to the slurry. The amount of precious metal sulfur concentrate added is 80 kg per ton of manganese polymetallic ore, and the amount of concentrated sulfuric acid added is 200 kg per ton of manganese polymetallic ore. Stir and leach at 90-95℃ for 2 hours at a stirring speed of 500 r / min. During the stirring and leaching process, the pH value of the reaction system is in the range of 1-1.8. After leaching, perform solid-liquid separation to obtain manganese-rich leachate and leaching residue.

[0034] S2: While the leaching residue is still hot, water is added to prepare a leaching residue slurry. The mass percentage concentration of the leaching residue slurry is 30%. The temperature of the prepared leaching residue slurry is 57℃ and the pH value is 2.0. A composite collector is added to the leaching residue slurry. The composite collector is a mixture of hydrocarbon dithiophosphate sulfide ester, isopentyl xanthate propylene ester and methyl isobutyl methanol. The mass ratio of hydrocarbon dithiophosphate sulfide ester, isopentyl xanthate propylene ester and methyl isobutyl methanol is 5:2:1. The amount of composite collector added is 100g per ton of manganese polymetallic ore. Then, two flotation roughing processes are carried out to obtain roughing concentrate 1, roughing concentrate 2 and roughing tailings, respectively.

[0035] S3: Add a composite collector to the roughing tailings. The composition of the composite collector is the same as that in step S2. The amount of composite collector added is 50g per ton of manganese polymetallic ore. Perform one scavenging. The scavenged tailings are low-sulfur iron ore. The scavenged ore is returned to the previous operation in sequence to form a closed loop.

[0036] Rough concentrate 1 and rough concentrate 2 are combined and subjected to two blank flotation refining processes (i.e., flotation refining without adding reagents) to obtain gold and silver rich concentrate. The middlings from the two refining processes are sequentially returned to the previous stage of operation to form a closed loop.

[0037] In this embodiment, the gold grade of the gold-silver concentrate is 35.84 g / t, the silver grade is 696.92 g / t, the sulfur grade is 47.22%, the gold recovery rate is 83.38%, and the silver recovery rate is 80.55%.

[0038] The sulfur grade in the low-sulfur iron ore is 0.41%, the sulfur removal rate is 90.74%, and the iron grade is 47.63%.

[0039] The manganese content in the manganese-rich leachate was 23.81 g / L, and the manganese leaching rate was 90.24%.

[0040] Example 2

[0041] This embodiment provides a combined beneficiation method for precious metal-bearing sulfur concentrate and manganese-bearing polymetallic ore. Both the precious metal-bearing sulfur concentrate and the manganese-bearing polymetallic ore are sourced from Yunnan Province. The precious metal-bearing sulfur concentrate has a gold grade of 2.18 g / t, a silver grade of 28.61 g / t, and a sulfur grade of 47.48%. The manganese-bearing polymetallic ore has a manganese grade of 3.57%, a gold grade of 3.21 g / t, a silver grade of 67.59 g / t, and an iron grade of 45.29%. The grinding fineness of the manganese-bearing polymetallic ore is -0.074 mm (60%), and the grinding fineness of the precious metal-bearing sulfur concentrate is -0.043 mm (80%).

[0042] The process includes the following steps:

[0043] S1: Prepare a manganese polymetallic ore slurry with water to a concentration of 35% by mass. Add precious metal sulfur concentrate and concentrated sulfuric acid with a concentration of 98% by mass to the slurry. The amount of precious metal sulfur concentrate added is 60 kg per ton of manganese polymetallic ore, and the amount of concentrated sulfuric acid added is 150 kg per ton of manganese polymetallic ore. Stir and leach at 90-95℃ for 2 hours at a stirring speed of 500 r / min. During the stirring and leaching process, the pH value of the reaction system is in the range of 1.3-2.0. After leaching, perform solid-liquid separation to obtain manganese-rich leachate and leaching residue.

[0044] S2: While the leaching residue is still hot, water is added to prepare a leaching residue slurry. The mass percentage concentration of the leaching residue slurry is 30%. The temperature of the prepared leaching residue slurry is 60℃, and the pH value is 2.9. A composite collector is added to the leaching residue slurry. The composite collector is a mixture of hydrocarbon dithiophosphate sulfide ester, isopentyl xanthate propylene ester, and methyl isobutyl methanol. The mass ratio of hydrocarbon dithiophosphate sulfide ester, isopentyl xanthate propylene ester, and methyl isobutyl methanol is 5:2:1. The amount of composite collector added is 80g per ton of manganese polymetallic ore. Then, two flotation roughing processes are carried out to obtain roughing concentrate 1, roughing concentrate 2, and roughing tailings, respectively.

[0045] S3: Add a composite collector to the roughing tailings. The composition of the composite collector is the same as that in step S2. The amount of composite collector added is 40g per ton of manganese polymetallic ore. Perform one scavenging. The scavenged tailings are low-sulfur iron ore. The scavenged ore is returned to the previous operation in sequence to form a closed loop.

[0046] Rough concentrate 1 and rough concentrate 2 are combined and subjected to two blank flotation refining processes (i.e., flotation refining without adding reagents) to obtain gold and silver rich concentrate. The middlings from the two refining processes are sequentially returned to the previous stage of operation to form a closed loop.

[0047] In this embodiment, the gold grade of the gold-silver concentrate is 41.49 g / t, the silver grade is 848.18 g / t, the sulfur grade is 40.25%, the gold recovery rate is 82.54%, and the silver recovery rate is 81.34%.

[0048] The sulfur grade in the low-sulfur iron ore is 0.37%, the sulfur removal rate is 89.51%, and the iron grade is 47.61%.

[0049] The manganese content in the manganese-rich leachate was 21.51 g / L, and the manganese leaching rate was 91.29%.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for the combined beneficiation of precious metal-bearing sulfur concentrate and manganese-bearing polymetallic ore, characterized in that, Including the following steps: S1: Add precious metal sulfur concentrate and sulfuric acid to the manganese polymetallic ore slurry, stir and leach at 90-95℃. During the stirring and leaching process, the pH value of the reaction system is 1-2. Then, the solid and liquid are separated to obtain manganese-rich leaching solution and leaching residue respectively. S2: The leaching residue is prepared into a leaching residue slurry with a temperature ≥55℃ and a pH value of 2-3. A composite collector is added to the leaching residue slurry, which includes hydrocarbon dithiophosphate thioether ester, isopentyl xanthate propylene ester and methyl isobutyl methanol. Then, two roughing flotation processes are performed to obtain roughing concentrate 1, roughing concentrate 2 and roughing tailings, respectively. S3: The composite collector is added to the roughing tailings for a scavenging process. The scavenged tailings are low-sulfur iron-bearing ore. The scavenged tailings are returned to the previous operation in sequence to form a closed loop. The rougher concentrate 1 and rougher concentrate 2 are combined and subjected to two blank flotation cleaning processes to obtain gold and silver rich concentrate. The middlings from the two cleaning processes are returned to the previous stage of operation in sequence to form a closed loop.

2. The method according to claim 1, characterized in that, In step S1, the amount of precious metal sulfur concentrate added is 60-80 kg per ton of manganese polymetallic ore.

3. The method according to claim 1, characterized in that, The composite collector is a mixture of alkyl dithiophosphate thioether ester, isopentyl xanthate propylene ester, and methyl isobutyl methanol, wherein the mass ratio of alkyl dithiophosphate thioether ester, isopentyl xanthate propylene ester, and methyl isobutyl methanol is (3-6):(1-3):(0.5-1.5).

4. The method according to claim 3, characterized in that, In step S2, the amount of the composite collector added is 80-100g per ton of manganese polymetallic ore.

5. The method according to claim 3, characterized in that, In step S3, the amount of the composite collector added is 40-50g per ton of manganese polymetallic ore.

6. The method according to claim 1, characterized in that, The mass percentage concentration of the manganese-containing polymetallic ore slurry is 30-40%.

7. The method according to claim 6, characterized in that, The leaching residue is mixed with water to prepare a leaching residue slurry, and the mass percentage concentration of the leaching residue slurry is 28-33%.

8. The method according to claim 1, characterized in that, The manganese-bearing polymetallic ore has a manganese grade of 3.0–4.5%, a gold grade of 2.8–3.5 g / t, a silver grade of 55–70 g / t, and an iron grade of 40–48%. The precious metal-bearing sulfur concentrate has a gold grade of 2.0–3.0 g / t, a silver grade of 25–35 g / t, and a sulfur grade of 43–50%.