CN109590114B - Method for separating copper and sulfur in copper-sulfur ore - Google Patents
Method for separating copper and sulfur in copper-sulfur ore Download PDFInfo
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- CN109590114B CN109590114B CN201811323404.9A CN201811323404A CN109590114B CN 109590114 B CN109590114 B CN 109590114B CN 201811323404 A CN201811323404 A CN 201811323404A CN 109590114 B CN109590114 B CN 109590114B
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/007—Modifying reagents for adjusting pH or conductivity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention belongs to the field of mineral processing engineering, and particularly discloses a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps: step one, grinding raw ore, and then mixing the raw ore with sodium sulfide to make the pH value of the raw ore pulp be 7-10; adding a first copper collecting agent into the raw ore pulp, and performing flotation to obtain copper-sulfur bulk concentrate; adding activated carbon into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp; sequentially adding lime, sodium sulfide and modified dextrin into the first ore pulp, and uniformly stirring to obtain second ore pulp; and step five, adding a second copper collecting agent into the second ore pulp, uniformly stirring, performing flotation to obtain copper concentrate, and performing scavenging to obtain sulfur concentrate. The method for separating copper and sulfur from copper-sulfur ore provided by the invention has an obvious effect on separating copper and sulfur and is environment-friendly.
Description
Technical Field
The invention belongs to the field of mineral processing engineering, and particularly discloses a method for separating copper and sulfur in copper-sulfur ores.
Background
The copper-sulfur ore containing secondary copper minerals such as copper blue, chalcocite and the like belongs to typical refractory sulfide ore. The separation of copper and sulfur minerals in the ores is difficult in the separation of sulfide ores because firstly, copper exists in various copper minerals with different forms, the floatability of the copper is different, and the flotation separation conditions are complex and difficult to control; secondly, the secondary copper sulfide minerals in the copper sulfur ores are oxidized in different degrees in the ore deposit and the ore grinding process to generate soluble salts such as copper sulfate, ferric sulfate and the like, particularly copper ions, which have activation effect on pyrite to increase the floatability of the pyrite, thereby causing difficult copper-sulfur separation; ③ Sulfur in copper-sulfur oresHigh content of iron oxide minerals, easy oxidation, and Cu generated after oxidation2+、Fe2+、SO4 2-、SO3 2-And the like, so that the iron sulfide is difficult to inhibit, the flotation reagent is consumed, and the inhibition effect is destroyed, so that the copper-sulfur separation condition is complicated.
The high-alkali process represented by lime is the most widely used sulfide ore flotation separation process in production, the application of the high-alkali process in copper-sulfur ores mainly containing chalcopyrite is quite mature, the copper-sulfur separation effect is good, and higher copper concentrate grade and recovery rate can be obtained.
Disclosure of Invention
The invention aims to provide a method for separating copper and sulfur from copper-sulfur ore, which is simple in reaction process and easy to control compared with the prior art.
Still another object of the present invention is to provide a method for separating copper and sulfur from copper-sulfur ore, which has a significant effect on separating copper and sulfur and is environmentally friendly.
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
step one, grinding raw ore, and then mixing the raw ore with sodium sulfide to make the pH value of the raw ore pulp be 7-10;
adding a first copper collecting agent into the raw ore pulp, and performing flotation to obtain copper-sulfur bulk concentrate;
adding activated carbon into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp;
sequentially adding lime, sodium sulfide and modified dextrin into the first ore pulp, and uniformly stirring to obtain second ore pulp;
and step five, adding a second copper collecting agent into the second ore pulp, uniformly stirring, performing flotation to obtain copper concentrate, and performing scavenging to obtain sulfur concentrate.
The separation method provided by the invention is easily applied to the separation of copper and sulfur in the copper-sulfur ore containing secondary copper minerals such as copper blue, chalcocite and the like, the grade of the copper concentrate obtained by the method reaches more than 20%, the copper recovery rate is 74-80%, and the separation effect is obvious.
The chemical sodium sulfide can be completely ionized in aqueous solution to generate a large amount of S2-Ionized S2-Can react with Cu generated by copper blue of secondary copper mineral2+Copper sulfide precipitate is generated by reaction, the recovery rate of copper is improved after the copper sulfide precipitate is effectively collected, and HS ionized by sodium sulfide-And S2-The modified dextrin further enhances the effective inhibition on sulfide such as pyrite, has obvious copper-sulfur separation effect and stable flotation operation.
Preferably, in the first step, the input amount of the sodium sulfide is 200-1000g/t raw ore; in the second step, the first copper collecting agent is 0-isopropyl-N-ethyl thionocarbamate and butyl xanthate, the adding amount of the 0-isopropyl-N-ethyl thionocarbamate is 20-120g/t of raw ore, the adding amount of the butyl xanthate is 100-240g/t of raw ore, and the adding amount ratio of the 0-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 12-12: 1.
The synergistic effect generated by the combination of the two copper collectors and the combination proportion of multiple tests enable copper minerals with different floatability to effectively float, and finally, the recovery rate of copper is improved.
Preferably, in the first step, the input amount of the sodium sulfide is 400-600g/t raw ore; in the second step, the input amount of the 0-isopropyl-N-ethyl thionocarbamate is 80-100g/t of raw ore, the input amount of the butyl xanthate is 160-200g/t of raw ore, and the input amount ratio of the 0-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 1.6-1: 2.5.
Preferably, in the third step, the activated carbon of the raw ore with the input amount of 100-300g/t is added into the copper-sulfur bulk concentrate, and after ore grinding, the first ore pulp with the fineness of-325 meshes is obtained.
And in the third step, the activated carbon is added into the copper-sulfur bulk concentrate for grinding, and the removal of the chemical is carried out in the grinding process, so that the double effects of grinding and removal of the chemical are achieved, redundant chemicals are eliminated, the fresh surface of the mineral is formed again, and the copper mineral, the pyrite and the gangue mineral are subjected to monomer dissociation at the mesh of-325, thereby being beneficial to the smooth separation of copper and sulfur in the next step.
Preferably, in the fourth step, the input amount of the lime is 500-3000g/t of raw ore, the input amount of the sodium sulfide is 100-1000g/t of raw ore, and the input amount of the modified dextrin is 50-500g/t of raw ore;
wherein the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 60:2: 1-1: 2: 60.
The sodium sulfide and the modified dextrin have good inhibiting effect on pyrite, and the modified dextrin disclosed by the invention is small in medicament toxicity and environment-friendly. The method is characterized by combining sodium sulfide and modified dextrin, wherein the modified dextrin only needs to be added in a small amount, the cost is hardly increased, the taste of the copper concentrate can reach 20%, the copper recovery rate is increased to 74% -80%, and even if the copper recovery rate and the taste of the copper concentrate are obviously improved, unexpected beneficial effects are achieved.
Preferably, in the fourth step, the input amount of the lime is 1500-;
wherein the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 12:1.6: 1-1: 1.6: 12.
Preferably, in the fourth step, the modified dextrin comprises the following raw materials in percentage by weight:
70-90% of dextrin, 5-15% of tributyl phosphate, 2.8-8.5% of sodium hydroxide and 2.2-7.5% of phosphorus pentasulfide;
adding the dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water at the temperature of 30-45 ℃, and uniformly stirring to obtain the modified dextrin.
The modified dextrin is simple to synthesize and easy to operate, the raw materials are cheap and easy to obtain, and the copper recovery rate and the copper concentrate grade of the invention are obviously improved by using the modified dextrin.
Because the floatability of the pyrite in the copper-sulfur ore containing secondary copper is extremely high and is difficult to inhibit during copper-sulfur separation, the dextrin and the modified dextrin are applied to the copper-sulfur separation operation for the first time, but the copper-sulfur separation effect is influenced due to poor solubility of the dextrin, and the modified dextrin containing sodium hydroxide, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide is added, so that the dextrin is easy to dissolve, flotation foam is properly eliminated, the consumption of active carbon is reduced, and more importantly, the grade of copper concentrate is improved; in addition, fresh HS can be produced after using the modified dextrin-Strengthening the inhibition of high-activity pyrite.
Preferably, in the fourth step, the modified dextrin comprises the following raw materials in percentage by weight:
80-90% of dextrin, 5-10% of tributyl phosphate, 2.8-5.5% of sodium hydroxide and 2.2-4.5% of phosphorus pentasulfide;
adding the dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water at the temperature of 30-45 ℃, and uniformly stirring to obtain the modified dextrin.
Preferably, in the fifth step, the second copper collector is 0-isopropyl-N-ethylthionocarbamate, and the input amount is 5-50g/t of raw ore.
In the fifth step, the second copper collector is added because the agents adsorbed on the surface of the copper minerals are removed while the active carbon is added for removing the agents in the third step and the lime, the sodium sulfide and the modified dextrin are added for defoaming and inhibiting pyrite in the fourth step.
Preferably, the copper minerals in the raw ore are one or more of chalcocite, copper blue, chalcopyrite and malachite, and the sulfides are one or two of pyrite and pyrrhotite.
The copper-sulfur ore containing secondary copper minerals such as copper blue, chalcocite and the like belongs to typical refractory sulfide ore. The separation of copper and sulfur minerals in the ores is difficult in sulfide ore separation, and the separation effect is obvious when the separation of copper and sulfur is specially carried out in the mineral separation of refractory copper and sulfur ores containing secondary copper minerals.
The invention has the advantages that:
1. the method for separating copper and sulfur from copper-sulfur ore provided by the invention has the advantages of cheap and easily-obtained raw materials, low toxicity of the medicament and environmental friendliness.
2. The method for separating copper and sulfur from copper-sulfur ore provided by the invention has the advantages of simple process and easiness in control.
3. According to the method for separating copper and sulfur from copper-sulfur ore, the grade of the obtained copper concentrate is more than 20%, the copper recovery rate is 74% -80%, the copper-sulfur separation effect is obvious, and the flotation operation is stable.
4. According to the method for separating copper and sulfur from copper-sulfur ore, the adopted sodium sulfide and the modified dextrin have a good inhibiting effect on pyrite.
Drawings
FIG. 1 is a flow chart of the method for separating copper and sulfur from copper-sulfur ore according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The invention provides a method for separating copper and sulfur from copper-sulfur ore, wherein the used raw ore is ore which is not subjected to mineral separation or other processing processes and is mined from a tunnel, the raw ore is refractory copper-sulfur ore containing secondary copper minerals, the copper minerals in the raw ore are one or more of chalcocite, covellite, chalcopyrite and malachite, and the sulfides are one or two of pyrite and pyrrhotite.
As shown in fig. 1, the method for separating copper and sulfur from copper-sulfur ore according to the present invention comprises the following steps:
step one, mixing raw ore with sodium sulfide 200-;
adding 20-120 g/ton of primary ore and 100-240 g/ton of butyl xanthate into the primary ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate for flotation to obtain copper-sulfur bulk concentrate; wherein the input amount ratio of the O-isopropyl-N-ethylthiodicarbamate to the butyl xanthate is 1: 12-12: 1;
adding active carbon of raw ore with the input amount of 100-300g/t into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
sequentially adding lime, sodium sulfide and modified dextrin (three combined agents) into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 500-3000g/t raw ore, the input amount of the sodium sulfide is 100-1000g/t raw ore, and the input amount of the modified dextrin is 50-500g/t raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 60:2: 1-1: 2: 60;
wherein the modified dextrin comprises the following raw materials in percentage by weight:
70-90% of dextrin, 5-15% of tributyl phosphate, 2.8-8.5% of sodium hydroxide and 2.2-7.5% of phosphorus pentasulfide;
adding the dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water at the temperature of 30-45 ℃, and uniformly stirring to obtain the modified dextrin;
and step five, adding 5-50 g/ton of raw ore of a second copper collecting agent O-isopropyl-N-ethyl sulfur progressive carbamate into the second ore pulp which is uniformly stirred to achieve the effect of inhibiting the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the products in the tank to obtain the sulfur concentrates.
The invention provides the following examples which deal with the copper-sulfur ores of Tibet with a copper oxidation rate of 20.35%, the copper ores mainly including covellite-chalcocite, chalcopyrite and malachite, and the pyrite mainly including pyrite. According to the method for separating copper and sulfur from copper-sulfur ore, the grade of the obtained copper concentrate is more than 20%, the copper recovery rate is 74% -80%, the copper-sulfur separation effect is obvious, and the flotation operation is stable.
Example 1
In the fourth step of the invention, the modified dextrin is composed of the following raw materials in percentage by weight:
70% of dextrin, 15% of tributyl phosphate, 7.5% of sodium hydroxide and 7.5% of phosphorus pentasulfide; wherein, the modified dextrin is obtained by adding the weighed dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water with the temperature of 30 ℃ and uniformly stirring.
Example 2
In the fourth step of the invention, the modified dextrin is composed of the following raw materials in percentage by weight:
80% of dextrin, 10% of tributyl phosphate, 5.5% of sodium hydroxide and 4.5% of phosphorus pentasulfide; wherein, the modified dextrin is obtained by adding the weighed dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water with the temperature of 40 ℃ and uniformly stirring.
Example 3
In the fourth step of the invention, the modified dextrin is composed of the following raw materials in percentage by weight:
dextrin 81%, tributyl phosphate 7.5%, sodium hydroxide 8.5%, and phosphorus pentasulfide 3%; wherein, the modified dextrin is obtained by adding the weighed dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water with the temperature of 40 ℃ and uniformly stirring.
Example 4
In the fourth step of the invention, the modified dextrin is composed of the following raw materials in percentage by weight:
90% of dextrin, 5% of tributyl phosphate, 2.8% of sodium hydroxide and 2.2% of phosphorus pentasulfide; wherein, the modified dextrin is obtained by adding the weighed dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water with the temperature of 35 ℃ and uniformly stirring.
The modified dextrin in the embodiments 1 to 4 is used in the method for separating copper and sulfur from copper-sulfur ore provided by the invention.
Example 5
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
adding 200g/t of sodium sulfide into raw ore in an ore grinding machine for pulp mixing, grinding the raw ore while activating copper minerals such as malachite and the like, and enabling the pH of raw ore pulp to be 7 after grinding;
adding 20 g/ton of raw ore and 160 g/ton of raw ore of butyl xanthate into the raw ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thionocarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 8;
adding activated carbon of raw ore with the input amount of 100g/t into the copper-sulfur bulk concentrate, grinding the copper-sulfur bulk concentrate to first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the modified dextrin synthesized in the embodiment 3 into the first ore pulp, and quickly and fully stirring uniformly to obtain second ore pulp; the input amount of the lime is 500g/t of raw ore, the input amount of the sodium sulfide is 100g/t of raw ore, and the input amount of the modified dextrin is 50g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 10:2: 1;
and step five, adding 5 g/ton of raw ore of a second copper collecting agent O-isopropyl-N-ethyl sulfur carbamate into the second ore pulp, collecting copper minerals and inhibiting pyrite, stirring uniformly again, separating the copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the products in the tank to obtain sulfur concentrates.
Example 6
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
step one, adding 400g/t of sodium sulfide into raw ore in an ore mill for size mixing to enable the pH value of the raw ore pulp to be 8;
adding 50 g/ton of raw ore and 100 g/ton of raw ore of butyl xanthate into the raw ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 2;
adding activated carbon of 150g/t raw ore into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the modified dextrin synthesized in the embodiment 3 into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 1000g/t of raw ore, the input amount of the sodium sulfide is 300g/t of raw ore, and the input amount of the modified dextrin is 100g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 10:3: 1;
and step five, adding 10 g/ton of O-isopropyl-N-ethyl sulfur per carbamate serving as a second copper collecting agent into the second ore pulp which is uniformly stirred to inhibit the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the sulfur concentrates serving as products in the tank.
Example 7
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
adding 600g/t of sodium sulfide into raw ore in an ore mill for pulp mixing to enable the pH value of the raw ore pulp to be 8;
adding 80 g/ton of raw ore and 200 g/ton of butyl xanthate into the raw ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 2.5;
adding active carbon of raw ore with the input amount of 200g/t into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the modified dextrin synthesized in the embodiment 3 into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 1500g/t of raw ore, the input amount of the sodium sulfide is 500g/t of raw ore, and the input amount of the modified dextrin is 275g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 6:1.8: 1;
and step five, adding 20 g/ton of O-isopropyl-N-ethyl sulfur per carbamate serving as a second copper collecting agent into the second ore pulp which is uniformly stirred to inhibit the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the sulfur concentrates serving as products in the tank.
Example 8
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
step one, adding 500g/t of sodium sulfide into raw ore in an ore mill for size mixing to enable the pH value of the raw ore pulp to be 9;
adding 60 g/ton of raw ore and 180 g/ton of butyl xanthate into the raw ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 3;
adding activated carbon of raw ore with the input amount of 220g/t into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the modified dextrin synthesized in the embodiment 3 into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 3000g/t of raw ore, the input amount of the sodium sulfide is 600g/t of raw ore, and the input amount of the modified dextrin is 500g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 6:1.2: 1;
and step five, adding 30 g/ton of O-isopropyl-N-ethyl sulfur per carbamate serving as a second copper collecting agent into the second ore pulp which is uniformly stirred to inhibit the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the sulfur concentrates serving as products in the tank.
Example 9
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
adding 800g/t of sodium sulfide into raw ore in an ore mill for pulp mixing to enable the pH value of the raw ore pulp to be 8;
adding 120 g/ton of primary ore and 200 g/ton of primary ore of butyl xanthate into the primary ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 0.6: 1;
adding activated carbon of raw ore with the input amount of 250g/t into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the modified dextrin synthesized in the embodiment 3 into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 2800g/t of raw ore, the input amount of the sodium sulfide is 700g/t of raw ore, and the input amount of the modified dextrin is 350g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 8:2: 1;
and step five, adding 40 g/ton of O-isopropyl-N-ethyl sulfur per carbamate serving as a second copper collecting agent into the second ore pulp which is uniformly stirred to inhibit the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the sulfur concentrates serving as products in the tank.
Example 10
The invention provides a method for separating copper and sulfur in copper-sulfur ore, which comprises the following steps:
adding 1000g/t of sodium sulfide into raw ore in an ore mill for size mixing to enable the pH value of the raw ore pulp to be 10;
adding 100 g/ton of raw ore and 240 g/ton of butyl xanthate into the raw ore pulp by using a first copper collecting agent O-isopropyl-N-ethyl thiodicarbamate, and performing flotation to obtain copper-sulfur bulk concentrate; wherein the input proportion of the O-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 2.4;
adding activated carbon of raw ore with the input amount of 300g/t into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp with the fineness of-325 meshes;
step four, sequentially adding lime, sodium sulfide and the synthesized modified dextrin in the embodiment 3 into the first ore pulp, and uniformly stirring to obtain second ore pulp; the input amount of the lime is 3000g/t of raw ore, the input amount of the sodium sulfide is 1000g/t of raw ore, and the input amount of the modified dextrin is 500g/t of raw ore; the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 6:2: 1;
and step five, adding 50 g/ton of O-isopropyl-N-ethyl sulfur per carbamate serving as a second copper collecting agent into the second ore pulp which is uniformly stirred to inhibit the pyrite, uniformly stirring again, separating copper minerals from the pyrite, concentrating floating products of flotation to obtain copper concentrates, and scavenging the sulfur concentrates serving as products in the tank.
Similarly, the modified dextrin of example 1 was used in the separation method of examples 5 to 10 to form examples 11 to 16; the modified dextrin of example 2 was used in the separation process of examples 5 to 10 to form examples 17 to 22; the modified dextrin of example 4 was used in the separation method of examples 5 to 10 to form examples 23 to 28.
In examples 5 to 10 and examples 17 to 22, the copper recovery and the copper concentrate grade are shown in Table 1;
TABLE 1 copper-sulfur separation test results in copper-sulfur ores
| Examples | Copper grade (%) | Copper recovery (%) |
| Example 5 | 20.00 | 74.53 |
| Example 6 | 21.01 | 74.57 |
| Example 7 | 24.05 | 80.00 |
| Example 8 | 23.52 | 79.90 |
| Example 9 | 22.89 | 79.01 |
| Example 10 | 23.82 | 79.00 |
| Example 11 | 21.31 | 74.00 |
| Example 12 | 22.30 | 74.01 |
| Example 13 | 23.78 | 79.92 |
| Example 14 | 23.19 | 79.04 |
| Example 15 | 22.93 | 79.21 |
| Example 16 | 23.08 | 78.34 |
| Example 17 | 20.85 | 74.25 |
| Example 18 | 22.19 | 74.68 |
| Example 19 | 24.37 | 79.98 |
| Example 20 | 23.75 | 79.94 |
| Example 21 | 23.61 | 79.86 |
| Example 22 | 22.68 | 78.23 |
| Example 23 | 20.94 | 74.84 |
| Example 24 | 21.37 | 75.24 |
| Example 25 | 24.60 | 80.00 |
| Example 26 | 24.01 | 79.54 |
| Example 27 | 23.61 | 79.24 |
| Example 28 | 23.29 | 77.84 |
In addition, a comparative test group, in which no modified dextrin was added in step four, was added, and compared with example 7, the comparative results are shown in table 2:
table 2: comparative test set and comparative results of example 7
As can be seen from Table 2, the results obtained after the treatments with different inhibitors are completely different, the modified dextrin adopted by the invention has less dosage and low cost increase amplitude, so that the copper recovery rate and the copper concentrate grade in the example 7 are obviously improved.
Although embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, and further modifications may be readily implemented by those skilled in the art, and the invention is thus not limited to the specific details and illustrations shown herein, without departing from the general concept defined by the claims and their equivalents.
Claims (8)
1. A method for separating copper and sulfur in copper-sulfur ore is characterized by comprising the following steps:
step one, grinding raw ore, and then mixing the raw ore with sodium sulfide to make the pH value of the raw ore pulp be 7-10;
adding a first copper collecting agent into the raw ore pulp, and performing flotation to obtain copper-sulfur bulk concentrate;
adding activated carbon into the copper-sulfur bulk concentrate, and grinding to obtain first ore pulp;
sequentially adding lime, sodium sulfide and modified dextrin into the first ore pulp, and uniformly stirring to obtain second ore pulp;
wherein the modified dextrin comprises the following raw materials in percentage by weight:
70-90% of dextrin, 5-15% of tributyl phosphate, 2.8-8.5% of sodium hydroxide and 2.2-7.5% of phosphorus pentasulfide;
adding the dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water at the temperature of 30-45 ℃, and uniformly stirring to obtain the modified dextrin;
wherein the input amount of the lime is 500-3000g/t raw ore, the input amount of the sodium sulfide is 100-1000g/t raw ore, and the input amount of the modified dextrin is 50-500g/t raw ore;
wherein the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 60:2: 1-1: 2: 60;
and step five, adding a second copper collecting agent into the second ore pulp, uniformly stirring, performing flotation to obtain copper concentrate, and performing scavenging to obtain sulfur concentrate.
2. The method for separating copper and sulfur from copper and sulfur ore as claimed in claim 1, wherein in said step one, the input amount of said sodium sulfide is 200-1000g/t raw ore; in the second step, the first copper collecting agent is 0-isopropyl-N-ethyl thionocarbamate and butyl xanthate, the adding amount of the 0-isopropyl-N-ethyl thionocarbamate is 20-120g/t of raw ore, the adding amount of the butyl xanthate is 100-240g/t of raw ore, and the adding amount ratio of the 0-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 12-12: 1.
3. The method for separating copper and sulfur from copper and sulfur ore as claimed in claim 2, wherein in the first step, the input amount of sodium sulfide is 400-600g/t raw ore; in the second step, the input amount of the 0-isopropyl-N-ethyl thionocarbamate is 80-100g/t of raw ore, the input amount of the butyl xanthate is 160-200g/t of raw ore, and the input amount ratio of the 0-isopropyl-N-ethyl thionocarbamate to the butyl xanthate is 1: 1.6-1: 2.5.
4. The method for separating copper and sulfur from copper and sulfur ore as claimed in claim 1, wherein in the third step, the activated carbon with the input amount of 100-300g/t raw ore is added into the copper and sulfur bulk concentrate, and after ore grinding, the first ore pulp with the fineness of-325 meshes is obtained.
5. The method for separating copper and sulfur from copper and sulfur ore as claimed in claim 1, wherein in the fourth step, the input amount of lime is 1500-3000g/t of raw ore, the input amount of sodium sulfide is 400-600g/t of raw ore, and the input amount of modified dextrin is 250-350g/t of raw ore;
wherein the input amount ratio of the lime, the sodium sulfide and the modified dextrin is 12:1.6: 1-1: 1.6: 12.
6. The method for separating copper and sulfur from copper-sulfur ore according to claim 1, wherein in the fourth step, the modified dextrin comprises the following raw materials in percentage by weight:
80-90% of dextrin, 5-10% of tributyl phosphate, 2.8-5.5% of sodium hydroxide and 2.2-4.5% of phosphorus pentasulfide;
adding the dextrin, tributyl phosphate, sodium hydroxide and phosphorus pentasulfide into warm water at the temperature of 30-45 ℃, and uniformly stirring to obtain the modified dextrin.
7. The method of claim 1 wherein in step five the second copper collector is 0-isopropyl-N-ethylthionocarbamate and is dosed at 5-50g/t of raw ore.
8. A method as claimed in any one of claims 1 to 7, wherein the copper minerals in the raw ore are one or more of chalcocite, covellite, chalcopyrite and malachite, and the sulphides are one or both of pyrite and pyrrhotite.
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