CN112221719A - Method for improving recovery rate of associated gold from low-grade copper-sulfur ore - Google Patents
Method for improving recovery rate of associated gold from low-grade copper-sulfur ore Download PDFInfo
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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
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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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
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/002—Inorganic compounds
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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
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
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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
- B03D2201/005—Dispersants
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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
- 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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
Abstract
The invention discloses a method for improving recovery rate of associated gold of low-grade copper-sulfur ore, which comprises the following steps: grinding, asynchronous roughing one, asynchronous roughing two, asynchronous roughing three, mixed floating rough concentrate fine grinding operation, fine cleaning one, fine scavenging operation, fine cleaning two and fine cleaning three. The method has the advantages of strong adaptability, environmental protection and good comprehensive recovery effect on the low-grade copper-sulfur associated gold ore.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and relates to a method for improving associated gold recovery rate of low-grade copper-sulfur ore, which is particularly suitable for comprehensively recovering low-sulfur low-copper associated gold ore.
Background
With the progress of times and the development of science and technology, the demand of mineral resources is increased year by year, and the high-strength development of mineral products leads to the imminent exhaustion of single ore and rich ore; the mineral separation utilization of poor impurity and fine and associated ore resources is increasingly important. The utilization of copper ore and gold, silver and precious metal ore resources also face the problems that single and easily-treated copper (gold) ore is gradually reduced, and copper, gold and sulfur associated ore with low grade and complex embedding relation gradually becomes one of the main raw materials for the current comprehensive recovery of copper (gold). The minerals of the type have low copper and gold grade, complex embedding relation among gold, copper minerals and iron sulfide minerals, and low recovery rate of gold in copper (gold) concentrate and low comprehensive utilization rate of gold resources due to the fact that common pyrite wraps the gold.
For the low-grade gold-bearing copper-sulfur ore, the recovery of copper sulfide ore is mainly carried out by a flotation method, and the traditional separation process is mainly carried out by a priority flotation process and a mixed flotation and re-separation process. However, the conventional preferential flotation process or the mixed flotation and separation process is adopted, and the copper ore of the type is sorted in a strong-pressure and strong-pressure or strong-pressure and strong-pressure mode, so that the medicament consumption is generally high, the mineral separation index is poor, particularly the recovery rate of gold is low, and the comprehensive utilization rate of resources is low. In order to obtain better beneficiation indexes, optimization and improvement are carried out on the traditional process flow, and the recovery rate of associated gold is improved through the optimization of the flow structure and medicament parameters.
Therefore, the development of a beneficiation process with good grading effect and strong adaptability is beneficial to improving the recovery rate of copper and associated gold.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the method for improving the recovery rate of associated gold of the low-grade copper-sulfur ore, which has strong adaptability, is green and environment-friendly and has good comprehensive recovery effect on the low-grade copper-sulfur associated gold ore.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving recovery rate of associated gold of low-grade copper-sulfur ore comprises the following steps:
s1, grinding: mixing the crushed raw ore with water, feeding the mixture into a mill for milling, and adding 500g/t of calcium oxide according to each ton of raw ore, wherein the pH value of ore pulp is 9;
s2, asynchronous rough selection of one: adding the ore pulp ground in the step S1 into a slot-hanging flotation machine, and adding sulfide ore collecting agents of amyl xanthate and butylamine black powder, wherein the dosage of the amyl xanthate and the butylamine black powder is 40g/t and 20g/t respectively per ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage of the pinitol oil is 10g/t per ton of raw ore, performing asynchronous roughing after stirring to obtain a first rough concentrate, and performing asynchronous roughing on the obtained tailings;
s3, asynchronous roughing: the tailings obtained by the first asynchronous rough concentration enter an asynchronous rough concentration second flotation tank, collecting agents of amyl xanthate and butylamine black are added into the asynchronous rough concentration second flotation tank, and the use amounts of the amyl xanthate and the butylamine black are respectively 20g/t and 10g/t in terms of each ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage of the pinitol oil is 5g/t per ton of raw ore, performing asynchronous rough concentration II after stirring, obtaining a concentrate which is rough concentrate II, and performing asynchronous rough concentration III on the obtained tailings;
s4, asynchronous roughing: the tailings obtained by the second asynchronous rough concentration enter an asynchronous rough concentration third flotation tank, collecting agents of amyl xanthate and butylamine black are added into the asynchronous rough concentration third flotation tank, and the use amounts of the amyl xanthate and the butylamine black are respectively 10g/t and 5g/t in terms of each ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage is 2.5g/t according to each ton of raw ore; after stirring, carrying out asynchronous roughing on the mixture, wherein the obtained concentrate is rough concentrate III, and the obtained tailings are flotation tailings;
s5, combining the first rough concentrate, the second rough concentrate and the third rough concentrate into a mixed floating rough concentrate and performing fine grinding operation;
s6, fine grinding operation of the mixed floating rough concentrate:
adding the mixed floating rough concentrate obtained in the step S5 into a mill, adding calcium hypochlorite into the mill, wherein the dosage of the calcium hypochlorite is 150g/t per ton of raw ore, the pH value of ore pulp is adjusted to 9.5, and the obtained fine ground product enters a first concentration operation;
s7, selecting one operation: adding the fine ground product obtained in the step S6 into a first concentration flotation tank, and adding a dispersant water glass into the first concentration flotation tank, wherein the dosage of the water glass is 500g/t per ton of raw ore; after stirring, carrying out first selection, enabling the obtained foam product to enter second selection operation, and enabling the obtained tailings to enter fine scavenging operation;
s8, fine sweeping operation: adding a collecting agent Z-200, wherein the dosage of the Z-200 is 5g/t per ton of raw ore, stirring, then carrying out fine scavenging operation, returning the obtained foam product to the mixed floating rough concentrate fine grinding operation, and returning the obtained tailings to the asynchronous rough concentration operation;
s9, selecting two operations: adding calcium hypochlorite, wherein the dosage of the calcium hypochlorite is 60g/t per ton of raw ore, stirring, performing concentration two operation, performing concentration three operation on the obtained foam product, and returning the obtained tailings to the mixed floating rough concentrate fine grinding operation;
s10, selecting three operations: adding calcium hypochlorite, wherein the dosage of the calcium hypochlorite is 50g/t per ton of raw ore; after stirring, carrying out three operations of concentration, wherein the obtained foam product is copper concentrate, and the obtained tailings return to the two operations of concentration.
Further, in step S1, the raw ore is crushed to a particle size of 2mm or less.
Further, in step S1, the mass ratio of the crushed raw ore to water is 2: 1.
Further, in step S1, the portion of the ore ground to a product fineness of-0.075 mm accounts for 60% of the total mass.
Further, in step S6, the fraction of the product with fineness controlled at-0.038 mm accounted for 65% of the total mass.
The invention has the beneficial effects that:
(1) the low-alkali ore pulp environment reduces the lime consumption, improves the gold flotation activity, enhances the recovery effect of bare gold, reduces the inhibiting effect on copper-sulfur intergrowth, realizes the purpose of improving the recovery rate of copper and gold and reduces the medicament cost.
(2) The fine scavenging tailings return to the roughing cycle, which is beneficial to improving the recovery rate of the roughing copper and gold.
(3) The second tailing of the fine concentration and the scavenged tailing of the fine concentration are returned to the mill for fine grinding, which is favorable for increasing the dissociation degree of target minerals, is particularly favorable for exposing the gold wrapped by the pyrite and has obvious effect on improving the recovery rate of the gold.
(4) The addition of the dispersant water glass is beneficial to the dispersion of slime, the occurrence of the phenomenon of vicious cycle accumulation of ores in the concentration process is avoided, and the residual dispersant can improve the environment of roughed ore pulp along with the returning of the concentrate scavenging tailings to roughed.
Drawings
FIG. 1 is a schematic flow chart of a method of embodiment 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The low-grade copper-sulfur associated gold ore contains copper minerals mainly including chalcopyrite and a small amount of bornite; the gangue minerals in the ore include quartz, potash feldspar, chlorite, alunite, mica, etc. Associated gold mainly comprises monomer gold and continuous gold which account for about 60 percent of the total gold, and copper mineral carries gold which accounts for about 13 percent of the total gold; the gold-carrying of pyrite is about 9% of the total gold, and the gold-carrying of gangue minerals is about 18% of the total gold. The raw ore used in this example contained 0.48% Cu and 0.45g/t Au0.45g/t.
Fig. 1 is a flowchart of the method of this embodiment, which includes:
a: calcium oxide; b: pentylxanthate; c: buthylammonium nigrum; d: pine oil; e: water glass; f: calcium hypochlorite; g: z-200; a: raw ore; b: copper concentrate; c: and (4) tailings.
As shown in fig. 1, the specific implementation steps are as follows:
mixing the raw ore crushed to be less than 2mm and water according to the weight ratio of 2: 1, feeding the mixture into a mill for milling, adding 500g/t of calcium oxide, and milling until the fineness of the product is-0.075 mm accounting for 60%, wherein the pH value of ore pulp is 9. Adding ground ore pulp into a slot suspension flotation machine, adding sulfide ore collecting agents of amyl xanthate and butyl ammonium black, wherein the dosage is 40g/t and 20g/t respectively, stirring for 2 minutes, adding foaming agent pine oil, the dosage is 10g/t, stirring for 1 minute, then performing asynchronous roughing one, wherein the concentrate (foam product) is a rough concentrate one, and enabling tailings to enter asynchronous roughing two operation;
the method comprises the following steps that (1) asynchronous rough concentration first tailings enter an asynchronous rough concentration second flotation tank, collecting agents including amyl xanthate and butylammonium nigride are added, the using amounts of the amyl xanthate and the butylammonium nigride are respectively 20g/t and 10g/t, foaming agent pine oil is added after stirring is carried out for 2 minutes, the using amount of the foaming agent pine oil is 5g/t, asynchronous rough concentration second is carried out after stirring is carried out for 1 minute, concentrate (foam product) is rough concentrate second, and the tailings enter asynchronous rough concentration third operation;
and (2) allowing the second asynchronous rough concentration tailings to enter an asynchronous rough concentration third flotation tank, adding collecting agents including amyl xanthate and butylammonium-black, wherein the using amounts of the amyl xanthate and the butylammonium-black are respectively 10g/t and 5g/t, stirring for 2 minutes, adding foaming agent pine oil, wherein the using amount of the pine oil is 2.5g/t, stirring for 1 minute, and then performing asynchronous rough concentration third, wherein the concentrate (foam product) is rough concentrate third, the third asynchronous rough concentration tailings are flotation tailings, and the first rough concentrate, the second rough concentrate and the third rough concentrate are combined to form mixed flotation rough concentrate and enter a mill to perform fine grinding operation. Adding calcium hypochlorite into the mill, wherein the dosage is 150g/t, adjusting the pH value of ore pulp to 9.5, controlling the fineness of the product to be-0.038 mm and accounting for 65%, and performing a first selection operation on the finely ground product;
adding the finely ground product into a flotation tank, adding a dispersant water glass with the dosage of 500g/t, stirring for 3 minutes, then carrying out first selection operation, enabling the foam product to enter second selection operation, and enabling the tailings to enter fine scavenging operation;
feeding the first concentration tailings into a second concentration flotation tank, adding a collecting agent Z-200 with the dosage of 5g/t into the second concentration flotation tank, stirring for 2 minutes, performing fine scavenging operation, returning foam products to the mixed-flotation rough concentrate fine grinding operation, and returning tailings to the asynchronous rough concentration first operation;
feeding the foam product obtained in the first concentration step into a second concentration flotation tank, adding calcium hypochlorite into the second concentration flotation tank, stirring for 2 minutes, performing second concentration operation, feeding the foam product into third concentration operation, and returning tailings to the mixed-flotation rough concentrate fine grinding operation;
and (3) feeding the foam product obtained in the second concentration step into a third concentration flotation tank, adding calcium hypochlorite into the third concentration flotation tank, stirring for 2 minutes, and performing third concentration operation, wherein the foam product is copper concentrate, and the tailings return to the second concentration step.
Example 2
This example is substantially the same as example 1, except that the raw ore used in this example contains 0.51% Cu and 0.48g/t Au0.48g/t.
Example 3
This example is substantially the same as example 1, except that the raw ore used in this example contains 0.56% Cu and 0.53g/t Au0.53g/t.
The specific process test indexes of example 1, example 2 and example 3 are shown in table 1.
TABLE 1
Comparative example 1
The low-grade copper-sulfur associated gold ore contains copper minerals mainly including chalcopyrite and a small amount of bornite; the gangue minerals in the ore include quartz, potash feldspar, chlorite, alunite, mica, etc. Associated gold mainly comprises monomer gold and continuous gold which account for about 60 percent of the total gold, and copper mineral carries gold which accounts for about 13 percent of the total gold; the gold-carrying of pyrite is about 9% of the total gold, and the gold-carrying of gangue minerals is about 18% of the total gold.
The original production process comprehensively recovers copper and gold by adopting a process flow of asynchronous roughing tailing discarding, asynchronous roughing concentrate fine grinding and fine cleaning and direct tailing discarding of the scavenging tailings under a high-alkali condition. The experimental indexes of the original production process are shown in table 1.
TABLE 2
As can be seen from the comparison between tables 1 and 2, compared with the prior art, the recovery rate of copper and gold is improved by the process of the embodiment, and especially the improvement range of the recovery rate of gold is relatively large.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (5)
1. The method for improving the recovery rate of associated gold of low-grade copper-sulfur ore is characterized by comprising the following steps of:
s1, grinding: mixing the crushed raw ore with water, feeding the mixture into a mill for milling, and adding 500g/t of calcium oxide according to each ton of raw ore, wherein the pH value of ore pulp is 9;
s2, asynchronous rough selection of one: adding the ground ore pulp in the step S1 into a flotation machine, and adding sulfide ore collecting agents of amyl xanthate and butylamine black powder, wherein the dosage of the amyl xanthate and the butylamine black powder is 40g/t and 20g/t respectively per ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage of the pinitol oil is 10g/t per ton of raw ore, performing asynchronous roughing after stirring again, wherein the obtained concentrate is a first rough concentrate, and the obtained tailings enter an asynchronous roughing operation;
s3, asynchronous roughing: the tailings obtained by the first asynchronous rough concentration enter an asynchronous rough concentration second flotation tank, collecting agents of amyl xanthate and butylamine black are added into the asynchronous rough concentration second flotation tank, and the use amounts of the amyl xanthate and the butylamine black are respectively 20g/t and 10g/t in terms of each ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage of the pinitol oil is 5g/t per ton of raw ore, performing asynchronous rough concentration II after stirring, obtaining a concentrate which is rough concentrate II, and performing asynchronous rough concentration III on the obtained tailings;
s4, asynchronous roughing: the tailings obtained by the second asynchronous rough concentration enter an asynchronous rough concentration third flotation tank, collecting agents of amyl xanthate and butylamine black are added into the asynchronous rough concentration third flotation tank, and the use amounts of the amyl xanthate and the butylamine black are respectively 10g/t and 5g/t in terms of each ton of raw ore; adding a foaming agent of pinitol oil after stirring, wherein the dosage is 2.5g/t according to each ton of raw ore; after stirring, carrying out asynchronous roughing on the mixture, wherein the obtained concentrate is rough concentrate III, and the obtained tailings are flotation tailings;
s5, combining the first rough concentrate, the second rough concentrate and the third rough concentrate into a mixed floating rough concentrate and performing fine grinding operation;
s6, fine grinding operation of the mixed floating rough concentrate:
adding the mixed floating rough concentrate obtained in the step S5 into a mill, adding calcium hypochlorite into the mill, wherein the dosage of the calcium hypochlorite is 150g/t per ton of raw ore, the pH value of ore pulp is adjusted to 9.5, and the obtained fine ground product enters a first concentration operation;
s7, selecting one operation: adding the fine ground product obtained in the step S6 into a first concentration flotation tank, and adding a dispersant water glass into the first concentration flotation tank, wherein the dosage of the water glass is 500g/t per ton of raw ore; after stirring, carrying out first selection, enabling the obtained foam product to enter second selection operation, and enabling the obtained tailings to enter fine scavenging operation;
s8, fine sweeping operation: adding a collecting agent Z-200, wherein the dosage of the Z-200 is 5g/t per ton of raw ore, stirring, then carrying out fine scavenging operation, returning the obtained foam product to the mixed floating rough concentrate fine grinding operation, and returning the obtained tailings to the asynchronous rough concentration operation;
s9, selecting two operations: adding calcium hypochlorite, wherein the dosage of the calcium hypochlorite is 60g/t per ton of raw ore, stirring, performing concentration two operation, performing concentration three operation on the obtained foam product, and returning the obtained tailings to the mixed floating rough concentrate fine grinding operation;
s10, selecting three operations: adding calcium hypochlorite, wherein the dosage of the calcium hypochlorite is 50g/t per ton of raw ore; after stirring, carrying out three operations of concentration, wherein the obtained foam product is copper concentrate, and the obtained tailings return to the two operations of concentration.
2. The method of claim 1, wherein in step S1, the raw ore is crushed to a particle size of 2mm or less.
3. The method of claim 1, wherein in step S1, the mass ratio of crushed raw ore to water is 2: 1.
4. The method according to claim 1, characterized in that in step S1, the portion of the ore ground to a product fineness of-0.075 mm is 60% of the total mass.
5. The method according to claim 1, characterized in that in step S6, the fraction of product fineness controlled at particle size-0.038 mm is 65% of the total mass.
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