CN114011582B - Flotation method for improving beneficiation index of gold-bearing copper sulfide ore - Google Patents

Flotation method for improving beneficiation index of gold-bearing copper sulfide ore Download PDF

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CN114011582B
CN114011582B CN202111317501.9A CN202111317501A CN114011582B CN 114011582 B CN114011582 B CN 114011582B CN 202111317501 A CN202111317501 A CN 202111317501A CN 114011582 B CN114011582 B CN 114011582B
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ore
gold
combined
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CN114011582A (en
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丁湛
柏少军
毕云霄
李颉
袁加巧
文书明
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Kunming University of Science and Technology
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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
    • B03D1/018—Mixtures of inorganic and organic compounds
    • 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
    • B03D2201/02—Collectors
    • 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
    • B03D2201/04—Frothers
    • 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
    • B03D2201/06—Depressants
    • 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
    • B03D2203/025—Precious metal ores
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Abstract

The invention discloses a flotation method for improving beneficiation indexes of gold-bearing copper sulfide ores, and belongs to the technical field of metallurgical beneficiation. Based on the technical route of thiosulfate corrosion, sulfide precipitation, hydrogen peroxide, starch coupling inhibition and copper-sulfur selective flotation separation, the gold-containing copper sulfide ore is separated. The flotation method comprises the following steps: (1) roughing; (2) selecting I in a scavenging way; (3) selecting I; (4) b, scavenging II; (5) selecting II; (6) and (5) selecting III. By the flotation method, gold in the carrier mineral can be converted into the independent gold sulfide mineral, the loss of gold in pyrite to tailings is avoided, the synergistic benefit of the combined inhibitor is fully exerted, the quality and the recovery rate of gold and copper concentrate are improved, and the gold-containing copper-sulfur ore is economically, efficiently and cleanly developed and utilized under low alkalinity.

Description

Flotation method for improving beneficiation index of gold-bearing copper sulfide ore
Technical Field
The invention relates to the technical field of metallurgical beneficiation, in particular to a flotation method for improving beneficiation indexes of gold-bearing copper sulfide ores.
Background
Copper is widely applied to industries such as military industry, electric power, communication, transportation, light industry, building, machinery and the like. The latest statistical data show that: china has found that the storage capacity of copper ore resources is 9553.8 ten thousand tons, wherein the storage capacity of the copper ore resources with the copper grade lower than 0.7 percent accounts for about 56 percent, and the average grade of porphyry type copper deposit is about 0.5 percent. The industrial types of copper ore resource deposits in China are relatively complete, and 80% of copper minerals in copper ores with industrial value belong to sulfides. Along with the deep mining and the reduction of the easy-to-select ores, the characteristics of poor quality, fineness, impurities and the like of copper sulfide ore resources are increasingly prominent, and the high-efficiency processing of the resources is always a hot point of research in the field of mineral processing.
The gold-bearing copper-sulfur ore is a relatively common ore in sulfide ores, generally, copper mainly exists in the form of chalcopyrite, sulfur mainly exists in the form of pyrite, gold mainly exists in the form of natural gold, and copper sulfide minerals and pyrite are main carrier minerals of gold. Flotation is an important rough processing link for obtaining gold, copper metal and sulfur resources from the ores, and the key for realizing selective separation of copper and sulfur and comprehensive recovery of gold is flotation of the ores.
At present, the gold-bearing copper-sulfur ore is produced by adopting lime high-alkali flotation process (pH)>11) The method comprises the steps of adding a large amount of lime to inhibit pyrite, and then adding sulfide ore collectors including xanthate, black powder and foaming agent pinitol oil to perform separation flotation of copper, gold and sulfur under the high-alkali condition. However, the process has the following problems: (1) in high alkali (pH)>11) Under the condition, the copper and gold minerals are inhibited to a certain degree, so that the recovery rate of copper and gold is low. The reason is that at high alkali (pH)>11) Under the condition of a large amount of OH - The surface of the chalcopyrite is promoted to form a hydrophilic ferric hydroxide film, the floatability of the chalcopyrite is deteriorated, and the recovery rate of copper and gold is low. Meanwhile, pyrite, a gold-bearing carrier mineral, is severely inhibited under high-alkali conditions, and the surface of a gold monomer mineral is polluted, so that the floatability is poor. The method is the root cause of lower recovery rate of copper and gold in the lime high-alkali flotation process; (2) the use of a large amount of lime easily causes serious slime entrainment and influences the quality of the concentrate; (3) the problems of large lime consumption, difficult control, easy scaling and blockage of pipelines, serious equipment corrosion, serious mine wastewater pollution and the like exist; (4) when xanthate and black powder are used as collecting agents of gold-containing copper-sulfur ores, the problem of poor selectivity exists, and further consumption of inhibitors is increased. Therefore, the recovery rate of copper and gold is low in the lime high-alkali flotation process, the quality of copper concentrate is poor, the resource waste is serious, and the economic, efficient and clean development and utilization of gold-containing copper-sulfur ore resources are difficult to realize.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a flotation method for improving the beneficiation index of gold-bearing copper sulfide ores. Gold in carrier minerals is converted into independent gold sulfide minerals through a technical route of thiosulfate corrosion, sulfide precipitation, hydrogen peroxide and starch coupling inhibition and copper-sulfur selective flotation separation, so that the loss of gold in pyrite to tailings is avoided, the synergistic benefit of a combined inhibitor is fully exerted, the quality and the recovery rate of gold and copper concentrate are improved, and the gold-containing copper-sulfur ore is economically, efficiently and cleanly developed and utilized under low alkalinity.
In order to achieve the purpose, the invention provides the following technical scheme:
a flotation method for improving beneficiation indexes of gold-bearing copper sulfide ores comprises the following steps:
(1) roughing: adding a combined inhibitor into the ore pulp, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, and then performing roughing to obtain roughing foam and roughing underflow;
(2) and (3) scavenging I: adding a combined inhibitor into the roughing underflow, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out scavenging I to obtain scavenging I foam and scavenging I underflow, wherein the scavenging I foam returns to the roughing operation;
(3) selecting I: adding a combined inhibitor into the roughing foam, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out the fine separation I to obtain a fine separation I foam and a fine separation I underflow, and returning the fine separation I underflow to the roughing operation;
(4) and (4) scavenging II: adding a combined inhibitor into the bottom flow of the scavenging section I, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, then carrying out scavenging section II to obtain foams of the scavenging section II and tailings, and returning the foams of the scavenging section II to the operation of the scavenging section I;
(5) and (4) selecting II: adding a combined inhibitor into the foam I, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out concentration II to obtain foam II and underflow II, and returning the underflow II to the operation of concentration I;
(6) selecting III: adding a combined inhibitor into the foam of the concentration II, stirring, adding a combined collecting agent and a foaming agent, stirring, and then performing concentration III to obtain gold-containing copper concentrate and a bottom flow of the concentration III, and returning the bottom flow of the concentration III to the operation of the concentration II;
the combined inhibitor comprises the following components in parts by weight: 30-50 parts of hydrogen peroxide and 50-70 parts of starch; the combined collector comprises the following components in parts by mass: collecting agent Z-20050-70 parts and collecting agent BK 91630-50 parts.
Preferably, the preparation of the ore pulp in the step (1) comprises the following steps: grinding raw ore until the content of ore powder with the particle size of less than or equal to 74 mu m accounts for 75-90% of the total mass of the raw ore, adding sodium carbonate to adjust the pH of the primary pulp to 8-9 in the ore grinding process, adding sodium thiosulfate with the mass of 0.03-0.05% of the mass of the raw ore, after the ore grinding is finished, mixing the obtained primary pulp until the mass concentration of the ore powder is 25-35%, and preparing ore pulp.
According to the invention, gold existing in the sulfide ore is converted into independent gold sulfide minerals through thiosulfate corrosion-sulfidation precipitation, and the gold is efficiently recovered through the combined collecting agent, so that the loss of the gold existing in the pyrite to tailings is effectively avoided.
Preferably, the blowing agent is 2 # And (3) oil.
Preferably, in the step (1), the addition amount of the combined inhibitor is 0.06-0.08% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.02-0.04% of the mass of the raw ore, the addition amount of the combined collector is 0.004-0.008% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0005-0.0012% of the mass of the raw ore.
Preferably, in the step (2), the addition amount of the combined inhibitor is 0.06-0.08% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.02-0.04% of the mass of the raw ore, the addition amount of the combined collector is 0.004-0.008% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0005-0.0012% of the mass of the raw ore.
Preferably, in the step (3), the addition amount of the combined inhibitor is 0.01-0.03% of the mass of the raw ore, the addition amount of the combined collector is 0.002-0.004% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0003-0.0006% of the mass of the raw ore.
Preferably, in the step (4), the addition amount of the combined inhibitor is 0.015-0.02% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.005-0.01% of the mass of the raw ore, the addition amount of the combined collector is 0.001-0.002% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0002-0.004% of the mass of the raw ore.
Preferably, in the step (5), the addition amount of the combined inhibitor is 0.005-0.015% of the mass of the raw ore, the addition amount of the combined collector is 0.0005-0.001% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0001-0.0003% of the mass of the raw ore.
Preferably, in the step (6), the addition amount of the combined inhibitor is 0.007 to 0.01 percent of the mass of the raw ore, the addition amount of the combined collector is 0.0002 to 0.0005 percent of the mass of the raw ore, and the addition amount of the foaming agent is 0.0001 to 0.0003 percent of the mass of the raw ore.
Preferably, the stirring time of the stirring is 2-4 min.
The invention has the following beneficial technical effects:
the invention realizes economic, efficient and clean development and utilization of gold-containing copper-sulfur ores under low alkalinity (pH 7-9), and avoids the problems of large lime dosage, scaling of equipment and ore pulp conveying pipelines, environmental pollution of mine wastewater and the like in the traditional lime high-alkalinity-xanthate process.
The hydrogen peroxide in the combined inhibitor used in the invention can oxidize the surface of the pyrite, induce the surface of the pyrite to be passivated and modified, and form a stable cover of the hydrophilic iron component. The starch in the pyrite can strongly adsorb the iron-rich surface of the pyrite due to the rich hydroxyl, so that the hydrophilicity of the surface of the pyrite is increased, and the combined inhibitor has less influence on the surface of the pyrite, which is an important reason for realizing the selective flotation separation of copper and sulfur.
The invention improves the recovery rate of gold by means of thiosulfate corrosion-sulfidation precipitation. The principle is as follows: in the weak alkaline pulp system of sodium carbonate, the sodium thiosulfate can convert solid-phase gold (Au) in sulfide minerals into liquid-phase gold group ([ Au (S) in solution 2 O 3 ) 3 ] 3- ) Sodium sulfide further precipitates the liquid phase gold component as an independent gold sulfide mineral (Au) 2 S). Independent gold sulfide is realized through the action of the collecting agentAnd (4) effectively recovering minerals.
The combined collecting agent used in the invention can reduce micelle solubility of dissolution of pharmaceutical ingredients and improve the dissolution performance of the agent, thereby having stronger selectivity to flotation of copper sulfide ore, effectively avoiding mud entrainment and improving the quality and recovery rate of copper concentrate. Compared with the traditional lime high-alkali-xanthate process, the copper grade is improved by 1-2%, the copper recovery rate is improved by 3-5%, the gold grade is improved by 2-3%, and the gold recovery rate is improved by 10-15%.
Drawings
FIG. 1 is a process flow diagram of the flotation of gold-bearing copper sulfide ore according to the invention.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The collector Z-200 used in the examples and the comparative examples of the invention is purchased from Wuling Kabushiki Kaisha Co.Ltd; the used collecting agent BK916 is purchased from Beijing mining and metallurgy research institute.
The amounts of the sodium thiosulfate, the sodium sulfide, the combined inhibitor, the combined collector and the foaming agent added in the embodiment and the comparative example of the invention are all based on the mass of the raw ore, and substances with corresponding masses are added.
Example 1
The raw ore grades selected in the embodiment are copper 0.75%, sulfur 24.50%, iron 25.32% and gold 0.28 g/t. The material composition is as follows: the main metal minerals in the ore mainly comprise pyrite and chalcopyrite, and the small amount and trace minerals comprise marcasite, bornite, chalcocite and chalcocite; the gangue minerals include pyroxene, dolomite, quartz, calcite, feldspar, chlorite, and celadon. The analysis result of the raw copper phase shows that the copper minerals are mainly primary copper minerals (accounting for 92 percent), and the chalcopyrite accounts for 95 percent in the primary copper minerals.
The combined inhibitor used in the present example was obtained by mixing 45 parts of hydrogen peroxide and 65 parts of starch.
The combined collector used in the embodiment is obtained by mixing Z-20060 parts of a collector and BK91640 parts of a collector.
The specific beneficiation steps are as follows:
(1) adding sodium carbonate to adjust the pH of the primary pulp to be 8.5 and 400g/t of sodium thiosulfate in the grinding process of the raw ore, and grinding until the content of the ore powder with the particle size of less than or equal to 74 mu m accounts for 80 percent of the mass of the raw ore; the primary pulp is mixed until the concentration of the mineral powder is 30 wt%, ore pulp is obtained, 800g/t of combined inhibitor is added, stirring is carried out for 3min, 300g/t of sodium sulfide is carried out, stirring is carried out for 3min, 60g/t of combined collecting agent and 2g/t of foaming agent are combined # Stirring the oil for 3min at a concentration of 10g/t, and performing rough concentration to obtain foam and underflow;
(2) adding 400g/t of combined inhibitor into the underflow obtained in the step (1), stirring for 3min, 150g/t of sodium sulfide, stirring for 3min, 30g/t of combined collector and 2g/t of foaming agent # Stirring the oil for 3min at the concentration of 6g/t, performing scavenging I to obtain foam and bottom flow, and returning the foam of the scavenging I to the roughing operation; adding 200g/t of combined inhibitor into the foam obtained in the step (1), stirring for 3min, combining 30g/t of collecting agent and 2g/t of foaming agent # Oil 4g/t, stirring for 3min, concentrating I to obtain foam andunderflow, the underflow returns to the roughing operation;
(3) adding 200g/t of combined inhibitor into the underflow obtained in the scavenging step I in the step (2), stirring for 3min, 80g/t of sodium sulfide, stirring for 3min, combining 15g/t of collecting agent and 2g/t of foaming agent # Stirring the oil for 3min at a concentration of 4g/t, performing scavenging II to obtain foam and tailings, and returning the foam of the scavenging II to the operation of the scavenging I; adding 100g/t of combined inhibitor into the foam obtained in the step (2) for fine separation I, stirring for 3min, combining 15g/t of collecting agent and 2g/t of foaming agent # Stirring the oil for 3min at a speed of 2g/t, performing concentration II to obtain foam and underflow, and returning the underflow to the concentration I operation;
(4) adding 70g/t of combined inhibitor into the foam obtained in the step (2) in the concentration II, stirring for 3min, combining 4g/t of collecting agent and 2g/t of foaming agent # And 2g/t of oil, stirring for 3min, carrying out concentration III to obtain gold-containing copper concentrate and underflow, and returning the underflow to the concentration II operation.
And (3) test results: the copper concentrate grade is 21.88 percent, the copper recovery rate is 93.12 percent, the gold grade is 5.8g/t, and the gold recovery rate is 83.15 percent. Compared with the traditional lime high-alkali-xanthate process (the same flotation process as that in example 1 is adopted, the difference is that lime is used for replacing a combined inhibitor and controlling the roughing pH to be 12, ethyl xanthate is used for replacing a combined collecting agent, the using amount of each operation is the same as that of the combined collecting agent, and no sodium thiosulfate and sodium sulfide are added), the copper grade is improved by 1.8%, the copper recovery rate is improved by 3.2%, the gold grade is improved by 1.5g/t, and the gold recovery rate is improved by 14%.
Example 2
The raw ore grades selected in the embodiment are copper 0.58%, sulfur 22.50%, iron 23.32% and gold 0.21 g/t. The material composition is as follows: the main metal minerals in the ore are pyrite and chalcopyrite, and the small and trace minerals are variegated copper ore, chalcocite and blue chalcocite; the gangue minerals are dolomite, quartz, and calcite. The analysis result of the primary copper phase shows that the copper minerals comprise primary copper minerals and secondary copper minerals, wherein the primary copper minerals are mainly (92%), the primary copper minerals comprise 95% of chalcopyrite and 2% of copper oxide.
The combined inhibitor used in the embodiment is obtained by mixing 50 parts of hydrogen peroxide and 50 parts of starch.
The combined collector used in the embodiment is obtained by mixing Z-20050 parts of a collector and BK91650 parts of a collector.
The specific beneficiation steps are as follows:
(1) adding sodium carbonate to adjust the pH of the primary pulp to 9 and sodium thiosulfate to 300g/t in the grinding process of the raw ore, and grinding until the content of ore powder with the particle size of less than or equal to 74 mu m accounts for 90 percent of the mass of the raw ore; the primary pulp is mixed until the concentration of the mineral powder is 30 wt%, ore pulp is obtained, 600g/t of combined inhibitor is added, stirring is carried out for 3min, 150g/t of sodium sulfide is carried out, stirring is carried out for 3min, 50g/t of combined collecting agent and 2g of foaming agent are added # Stirring the oil for 3min at a concentration of 10g/t, and performing rough concentration to obtain foam and underflow;
(2) adding 300g/t of combined inhibitor into the underflow obtained in the step (1), stirring for 3min, 80g/t of sodium sulfide, stirring for 3min, 30g/t of combined collector and 2g/t of foaming agent # Stirring the oil for 3min at the concentration of 5g/t, performing scavenging I to obtain foam and bottom flow, and returning the foam of the scavenging I to the roughing operation; adding 150g/t of combined inhibitor into the foam obtained in the step (1), stirring for 3min, combining 30g/t of collecting agent and 2g/t of foaming agent # 5g/t of oil, stirring for 3min, carrying out fine selection I to obtain foam and underflow, and returning the underflow to the rough selection operation;
(3) adding 150g/t of combined inhibitor into the underflow obtained in the scavenging step I in the step (2), stirring for 3min, 40g/t of sodium sulfide, stirring for 3min, combining 15g/t of collecting agent and 2g/t of foaming agent # 3g/t of oil, stirring for 3min, performing scavenging II to obtain foam and tailings, and returning the foam of the scavenging II to the operation of the scavenging I; adding 80g/t of combined inhibitor into the foam obtained in the step (2) for fine separation I, stirring for 3min, combining 15g/t of collecting agent and 2g/t of foaming agent # Stirring the oil for 3min at a speed of 2g/t, performing concentration II to obtain foam and underflow, and returning the underflow to the concentration I operation;
(4) adding 40g/t of combined inhibitor into the foam obtained in the step (2) in the concentration II, stirring for 3min, combining 8g/t of collecting agent and 2g of foaming agent # 3g/t of oil, stirring for 3min, carrying out concentration III to obtain gold-containing copper concentrate and underflow, and returning the underflow to the concentration II operation.
And (3) test results: the grade of copper concentrate is 20.20 percent, the recovery rate of copper is 91.32 percent, the grade of gold is 5.3g/t, and the recovery rate of gold is 81.5 percent. Compared with the traditional lime high-alkali-xanthate process (the same flotation process as that in example 2 is adopted, the difference is that lime is used for replacing a combined inhibitor and controlling the roughing pH to be 12, ethyl xanthate replaces a combined collecting agent, the using amount of each operation is the same as that of the combined collecting agent, and no sodium thiosulfate and sodium sulfide are added), the copper grade is improved by 1.3%, the copper recovery rate is improved by 2.8%, the gold grade is improved by 1.2g/t, and the gold recovery rate is improved by 12%.
Comparative example 1
The same raw ore and flotation scheme as in example 1 was used, except that an equal mass of starch was used instead of the combined depressants in each step.
And (3) test results: the copper concentrate grade is 19.21 percent, the recovery rate of copper is 91.2 percent, the gold grade is 4.2g/t, and the recovery rate of gold is 82.5 percent.
Comparative example 2
The same raw ore and flotation scheme as in example 1 was used, except that an equal mass of collector BK916 was used instead of the combined collector in each step.
And (3) test results: the grade of copper concentrate is 19.3 percent, the recovery rate of copper is 91.45 percent, the grade of gold is 4.8g/t, and the recovery rate of gold is 79.5 percent.
Comparative example 3
The same run and flotation scheme as in example 1 was used except that no sodium thiosulfate was added.
And (3) test results: the copper concentrate grade is 19.5 percent, the recovery rate of copper is 91.45 percent, the gold grade is 4.2g/t, and the recovery rate of gold is 61.5 percent.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (8)

1. A flotation method for improving the beneficiation index of gold-bearing copper sulfide ore is characterized by comprising the following steps:
(1) roughing: adding a combined inhibitor into the ore pulp, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, and then performing roughing to obtain roughing foam and roughing underflow;
(2) and (3) scavenging I: adding a combined inhibitor into the roughing underflow, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out scavenging I to obtain scavenging I foam and scavenging I underflow, wherein the scavenging I foam returns to the roughing operation;
(3) selection I: adding a combined inhibitor into the roughing foam, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out the fine separation I to obtain a fine separation I foam and a fine separation I underflow, and returning the fine separation I underflow to the roughing operation;
(4) and (4) scavenging II: adding a combined inhibitor into the bottom flow of the scavenging section I, stirring, adding sodium sulfide, stirring, adding a combined collecting agent and a foaming agent, stirring, then carrying out scavenging section II to obtain foams of the scavenging section II and tailings, and returning the foams of the scavenging section II to the operation of the scavenging section I;
(5) and (4) selecting II: adding a combined inhibitor into the foam I, stirring, adding a combined collecting agent and a foaming agent, stirring, and then carrying out concentration II to obtain foam II and underflow II, and returning the underflow II to the operation of concentration I;
(6) selecting III: adding a combined inhibitor into the foam of the concentration II, stirring, adding a combined collecting agent and a foaming agent, stirring, and then performing concentration III to obtain gold-containing copper concentrate and a bottom flow of the concentration III, and returning the bottom flow of the concentration III to the operation of the concentration II;
the combined inhibitor comprises the following components in parts by weight: 30-50 parts of hydrogen peroxide and 50-70 parts of starch; the combined collector comprises the following components in parts by mass: collecting agent Z-20050-70 parts and collecting agent BK 91630-50 parts;
the preparation steps of the ore pulp in the step (1) are as follows: grinding raw ore until the content of ore powder with the particle size of less than or equal to 74 mu m accounts for 75-90% of the total mass of the raw ore, adding sodium carbonate to adjust the pH of the primary pulp to 8-9 in the ore grinding process, adding sodium thiosulfate with the mass of 0.03-0.05% of the mass of the raw ore, after the ore grinding is finished, mixing the obtained primary pulp until the mass concentration of the ore powder is 25-35%, and preparing ore pulp.
2. The method of claim 1The flotation method for improving the mineral separation index of the gold-bearing copper sulfide ore is characterized in that the foaming agent is 2 # And (3) oil.
3. A flotation method for improving the beneficiation index of gold-containing copper sulfide ore according to claim 1, wherein in the step (1), the addition amount of the combined inhibitor is 0.06% -0.08% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.02% -0.04% of the mass of the raw ore, the addition amount of the combined collector is 0.004% -0.008% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0005% -0.0012% of the mass of the raw ore.
4. The flotation method for improving the beneficiation index of the gold-bearing copper sulfide ore according to claim 1, wherein in the step (2), the addition amount of the combined inhibitor is 0.06% -0.08% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.02% -0.04% of the mass of the raw ore, the addition amount of the combined collector is 0.004% -0.008% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0005% -0.0012% of the mass of the raw ore.
5. The flotation method for improving the beneficiation index of the gold-bearing copper sulfide ore according to claim 1, wherein in the step (3), the addition amount of the combined inhibitor is 0.01% -0.03% of the mass of the raw ore, the addition amount of the combined collector is 0.002% -0.004% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0003% -0.0006% of the mass of the raw ore.
6. The flotation method for improving the beneficiation index of the gold-bearing copper sulfide ore according to claim 1, wherein in the step (4), the addition amount of the combined inhibitor is 0.015% -0.02% of the mass of the raw ore, the addition amount of the sodium sulfide is 0.005% -0.01% of the mass of the raw ore, the addition amount of the combined collector is 0.001% -0.002% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0002% -0.004% of the mass of the raw ore.
7. The flotation method for improving the beneficiation index of gold-bearing copper sulfide ore according to claim 1, wherein in the step (5), the addition amount of the combined inhibitor is 0.005% -0.015% of the mass of the raw ore, the addition amount of the combined collector is 0.0005% -0.001% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0001% -0.0003% of the mass of the raw ore.
8. The flotation method for improving the beneficiation index of gold-bearing copper sulfide ore according to claim 1, wherein in the step (6), the addition amount of the combined inhibitor is 0.007% to 0.01% of the mass of the raw ore, the addition amount of the combined collector is 0.0002% to 0.0005% of the mass of the raw ore, and the addition amount of the foaming agent is 0.0001% to 0.0003% of the mass of the raw ore.
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