CN112619904B - Method for reducing impurities in copper concentrate obtained by copper-zinc-iron separation - Google Patents

Method for reducing impurities in copper concentrate obtained by copper-zinc-iron separation Download PDF

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CN112619904B
CN112619904B CN202011249838.6A CN202011249838A CN112619904B CN 112619904 B CN112619904 B CN 112619904B CN 202011249838 A CN202011249838 A CN 202011249838A CN 112619904 B CN112619904 B CN 112619904B
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copper
zinc
ton
concentrate
separation
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CN112619904A (en
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王李鹏
任琳珠
包玺琳
柏亚林
杨俊龙
王志丰
李健民
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Northwest Research Institute of Mining and Metallurgy
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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
    • 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
    • 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
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C22B15/0002—Preliminary treatment
    • C22B15/0004—Preliminary treatment without modification of the copper constituent
    • C22B15/0008—Preliminary treatment without modification of the copper constituent by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/02—Preliminary treatment of ores; Preliminary refining of zinc oxide
    • 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
    • B03D2201/06—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
    • B03D2203/04—Non-sulfide ores

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  • General Life Sciences & Earth Sciences (AREA)
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Abstract

A method for reducing impurities in copper concentrate from copper-zinc-iron separation comprises the steps of copper-zinc mixed flotation, copper-zinc fine separation and copper-zinc classification asynchronous separation. The copper-zinc mixed separation is carried out by adopting a low-concentration medium-alkalinity medium-weak collecting technology, the mineralization flotation environment of copper-zinc minerals is optimized, the upward floating of easy-to-float gangue and galena is weakened, the inhibition of metal impurities such as pyrite galena and the like is enhanced under the high alkalinity and low concentration of the copper-zinc mixed separation, and the phenomenon that a large amount of easy-to-float impurities float upwards in the copper-zinc mixed separation process caused by the traditional copper-zinc mixed separation method is avoided; the copper-zinc concentrate adopts a grading asynchronous separation process, so that the inhibition and removal of gangue and other metal impurities are enhanced, the qualified copper concentrate and zinc concentrate are obtained, the problems that the copper concentrate produced by the traditional process is poor in quality and high in impurity content and cannot be sold are solved, the economic benefit of an enterprise is improved, and mineral resources are saved.

Description

Method for reducing impurities in copper concentrate obtained by copper-zinc-iron separation
Technical Field
The invention relates to the technical field of mineral flotation separation processes, in particular to a method for reducing impurities in copper concentrate obtained by copper-zinc-iron separation.
Background
The iron-copper-zinc ore has the following characteristics: 1) the ore has high sulfur content and lead content of less than 0.6 percent and can not reach the comprehensive recovery standard; 2) the ore contains chlorite, serpentine, talc and other easily argillaceous gangue in many types, and has easily floated shale and mica. 3) Iron is a main metal, copper, zinc and other tail associated metals, fine grinding is needed in the iron separation process to separate iron and non-ferrous metal mineral monomers, a large amount of strong activating agents are added in the iron concentrate desulfurization, more than 70% of copper-lead mineral surfaces in the total tailings of the solid separation iron are hydrophobic, gangue and other sulfide minerals are extremely good in floatability and difficult to inhibit, and therefore the quality of the copper concentrate is easily influenced.
The traditional copper-zinc separation process comprises two processes of preferential flotation of copper and zinc and mixed flotation-copper-zinc separation of copper and zinc in sequence, copper-zinc mixed flotation-copper-zinc separation of copper and zinc minerals in iron tailings are usually applied, but the problems that the copper concentrate after separation contains high impurities and has low copper grade and cannot meet the marketing requirement due to large floating amount of easy-to-float gangue and other sulfide minerals exist.
Disclosure of Invention
The invention aims to provide a method for reducing impurities in iron-copper-zinc separation copper concentrate, which aims to solve the problems that the copper concentrate has poor quality and high impurities and cannot be sold when the iron-copper-zinc ore is treated by the prior technical scheme.
In order to achieve the purpose, the method for reducing the impurities in the copper concentrate obtained by copper-zinc-iron separation is characterized by comprising the following steps of 1, carrying out iron separation on iron-copper-zinc ore, adding 50-100 g/ton of sodium sulfide, 2000 g/ton of lime and 4000 g/ton of raw ore into total tailings after iron separation, carrying out ball milling on the raw ore, adding 30-50 g/ton of copper sulfate, 30-50 g/ton of butyl xanthate and 30-50 g/ton of ester-10530, stirring, carrying out copper-zinc roughing on the mixture, wherein the concentration of roughing pulp is 20-25%, adding water and 2000 g/ton of lime into copper-zinc rough concentrate, and obtaining copper-zinc ore pulp with the concentration of 20%; step 2, adding 200 g/ton of activated carbon 100 and 500 g/ton of sodium sulfide 300 into the copper-zinc ore concentrate pulp obtained in the step 1, regrinding, classifying, adding 50-100 g/ton of sodium sulfide and 1500 g/ton of sodium pyrosulfite into a coarse fraction obtained after classification, separating copper from zinc minerals, wherein the pulp concentration is 10-15%, obtaining copper rough concentrate, combining the copper rough concentrate with a fine fraction obtained after classification, adding 3000 g/ton of sulfurous acid 2000 and 3000 g/ton of zinc sulfate 2000, separating copper from zinc minerals, obtaining secondary copper rough concentrate, adding 50-100 g/ton of sodium sulfide, 200 g/ton of sulfurous acid and 500 g/ton into the secondary copper rough concentrate, and obtaining copper concentrate through twice concentration, adding 2000 g/ton of lime into both the separation tailings of the coarse fraction and the separation tailings of the fine fraction, 40 g/ton of butyl xanthate and 30 g/ton of pine oil are subjected to once roughing and three times of fine separation to produce zinc concentrate.
In the technical scheme of the method for reducing the impurity content of the copper concentrate from copper, zinc and iron separation, the further preferable technical scheme is characterized in that:
1. adding 70 g/ton of sodium sulfide and 3000 g/ton of lime into the raw ore in the step 1;
2. adding 40 g/ton of copper sulfate, 40 g/ton of butyl xanthate and 40 g/ton of ester-10540 in the step 1;
3. the concentration of the rougher pulp in the step is 23 percent;
4. 150 g/ton of active carbon and 400 g/ton of sodium sulfide are added in the step 2, regrinding is carried out, classification is carried out, 70 g/ton of sodium sulfide and 1300 g/ton of sodium metabisulfite are added in coarse fraction after classification, copper and zinc minerals are separated, and the concentration of ore pulp is 13%;
5. 2500 g/ton of sulfurous acid and 2500 g/ton of zinc sulfate are added into the copper rough concentrate and the classified fine fraction in the step 2;
6. 70 g/ton of sodium sulfide and 300 g/ton of sulfurous acid are added into the copper rough concentrate in the step 2.
Compared with the prior art, the method adopts the low-concentration medium-alkalinity and weak-alkalinity collecting technology to carry out copper-zinc mixed separation, optimizes the mineralization flotation environment of copper-zinc minerals, weakens the upward floating of the easy-to-float gangue and galena, strengthens the inhibition of metal impurities such as pyrite galena and the like under the high alkalinity and low concentration of the copper-zinc mixed separation, and avoids the large upward floating of the easy-to-float impurities in the copper-zinc mixed separation process caused by the traditional copper-zinc mixed separation method; the copper-zinc concentrate adopts a grading asynchronous separation process, so that the inhibition and removal of gangue and other metal impurities are enhanced, the qualified copper concentrate and zinc concentrate are obtained, and the problems that the copper concentrate produced by the traditional process is poor in quality, high in impurity content and incapable of being sold are solved.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1, a method for reducing impurities in copper concentrate from copper-zinc-iron separation comprises the following steps of 1, performing ore dressing operation on iron-copper-zinc ore, adding 50-100 g/ton of sodium sulfide and 4000 g/ton of lime-2000-plus-4000 g/ton of raw ore into total tailings after iron separation, performing ball mill grinding, adding 30-50 g/ton of copper sulfate, 30-50 g/ton of butyl xanthate and 30-50 g/ton of ester-10530, stirring, performing copper-zinc roughing, wherein the concentration of roughed ore pulp is 20-25%, adding water and 2000 g/ton of lime into copper-zinc rough ore concentrate, and obtaining copper-zinc ore pulp, wherein the pH value and the concentration of the copper-zinc ore pulp are 12 and 20%; step 2, adding 200 g/ton of activated carbon 100 and 500 g/ton of sodium sulfide 300 into the copper-zinc ore concentrate pulp obtained in the step 1, regrinding, classifying, adding 50-100 g/ton of sodium sulfide and 1500 g/ton of sodium pyrosulfite into a coarse fraction obtained after classification, separating copper from zinc minerals, wherein the pulp concentration is 10-15%, obtaining copper rough concentrate, combining the copper rough concentrate with a fine fraction obtained after classification, adding 3000 g/ton of sulfurous acid 2000 and 3000 g/ton of zinc sulfate 2000, separating copper from zinc minerals, obtaining secondary copper rough concentrate, adding 50-100 g/ton of sodium sulfide, 200 g/ton of sulfurous acid and 500 g/ton into the secondary copper rough concentrate, and obtaining copper concentrate through twice concentration, adding 2000 g/ton of lime into both the separation tailings of the coarse fraction and the separation tailings of the fine fraction, 40 g/ton of butyl xanthate and 30 g/ton of pine oil are subjected to once roughing and three times of fine separation to produce zinc concentrate. In the step 1-2, the 'g/ton of raw ore' refers to the g of the medicament added in each ton of the iron-selecting total tailings. The whole process flow in the step 1-2 is a closed-circuit flotation circulation flow. After iron separation, the total tailings adopt low-concentration and medium-alkalinity copper-zinc minerals and low-concentration and high-alkalinity copper-zinc concentration, and copper concentrate and zinc concentrate are obtained by grading and asynchronous separation of the copper-zinc concentrate.
Example 2, in a method for reducing the impurity content of copper concentrate from copper zinc iron separation according to example 1, 70 g/ton of sodium sulfide and 3000 g/ton of lime are added in step 1.
Example 3. in a method for reducing the impurities in copper concentrate from copper zinc iron separation according to example 1 or 2, 40 g/ton copper sulfate, 40 g/ton butyl xanthate and 10540 g/ton ester are added in step 1.
Example 4 a method for reducing the impurities in a copper concentrate for copper zinc iron separation according to example 1 or 2 or 3, wherein the concentration of the rougher pulp in the step is 23%.
Example 5. in a method for reducing the impurities in the copper concentrate from copper-zinc-iron separation according to any of examples 1 to 4, 150 g/ton of activated carbon and 400 g/ton of sodium sulfide are added in step 2, regrinding and classifying are carried out, and 70 g/ton of sodium sulfide and 1300 g/ton of sodium metabisulfite are added in the classified coarse fraction, so that the copper and zinc minerals are separated, and the pulp concentration is 13%.
Example 6. in a method for reducing the impurities in a copper concentrate for copper zinc iron separation according to any one of examples 1 to 5, 2500 g/ton sulfurous acid and 2500 g/ton zinc sulfate are added to the copper rough concentrate and the classified fine fraction in step 2.
Example 7. in a method for reducing the impurities in a copper zinc iron sorted copper concentrate according to any of examples 1 to 6, 70 g/ton of sodium sulfide and 300 g/ton of sulfurous acid are added to the copper rough concentrate in the step 2.
Embodiment 8, a method for reducing impurities in copper concentrate from copper-zinc-iron separation, comprising the steps of: step 1, carrying out ore dressing operation on iron, copper and zinc ores, adding 50 g/ton of sodium sulfide and 2000 g/ton of lime into iron-dressing total tailings before ore grinding operation, adding 30 g/ton of copper sulfate, 30 g/ton of butyl xanthate, 10530 g/ton of ester and water into a stirring barrel, adjusting the concentration of ore pulp to be 20%, and adjusting the pH of the ore pulp to be = 10; adding water and lime 2000 g/ton of raw ore and 1000 g/ton of raw ore into the first copper-zinc concentrate and the second copper-zinc concentrate respectively, wherein the concentration of ore pulp is 20%, and adding water into the third copper-zinc concentrate to adjust the concentration of the ore pulp to be 20% and the pH value to be 10; obtaining copper-zinc concentrate and tailings through a closed flotation circulation process; step 2, taking the copper-zinc ore concentrate pulp in the step 1 as feeding, adding 100 g/ton of activated carbon and 300 g/ton of sodium sulfide before regrinding operation, after grading treatment, adding 50 g/ton of sodium sulfide and 1000 g/ton of sodium metabisulfite into the graded coarse fraction, adjusting the pulp concentration to be 10 percent and the pH =6, and separating copper from zinc minerals; the obtained flotation foam is combined with the graded fine fraction, water, 2000 g/ton of sulfurous acid and 3000 g/ton of zinc sulfate are added before the copper and zinc separation of the graded fine fraction until the concentration is 20 percent and the pH is =6, 50 g/ton of sodium sulfide and 200 g/ton of sulfurous acid are respectively added before the first copper concentrate and the second copper concentrate, and copper concentrate is obtained through a closed-circuit flotation circulation flow; 2000 g/ton lime, 40 g/ton butyl xanthate and 30 g/ton pine alcohol oil are added into the coarse and immediate separated tailings, and then the mixture is stirred, and zinc concentrate is produced through primary zinc roughing and secondary zinc concentration operation.
Through detection, the copper grade, the lead grade and the zinc grade in the total iron-selecting tailings described in the embodiment 1 are 0.54%, 0.46% and 1.9%; the copper concentrate obtained by the method has 21.23% of copper grade, 1.14% of lead grade, 4.25% of zinc grade and 66.45% of copper recovery rate; the zinc grade of the zinc concentrate is 48.37 percent, the copper grade is 0.87 percent, the lead grade is 5.12 percent, and the zinc recovery rate is 80.34 percent.
In comparison with example 1, the traditional copper-zinc mixed flotation-copper-zinc separation process is adopted, lime and water are added into the same iron-selecting total tailings and ground in a ball mill until the pulp fineness reaches 12, the pulp concentration reaches 35%, then, 200 g/ton of copper sulfate, 120 g/ton of butyl xanthate and 60 g/ton of pine alcohol oil are added into the same iron-selecting total tailings, and after stirring, copper-zinc mixed roughing and copper-zinc mixed concentration (the concentration pulp pH value is 12) are carried out, so that copper-zinc concentrate pulp is obtained. And (3) regrinding the copper-zinc concentrate pulp, adding 200 g/ton of sodium sulfide into the raw ore, adding 500 g/ton of liquid sulfur dioxide into the raw ore, and then separating copper from zinc minerals to obtain copper concentrate and zinc concentrate. According to detection, the copper grade, the lead grade and the zinc grade of the total tailings of iron separation described in the comparative example 1 are 0.54%, 0.46% and 1.9%; the copper concentrate obtained by the process method of the comparative example 1 has 14.34 percent of copper grade, 11.23 percent of lead grade, 8.34 percent of zinc grade and 67.32 percent of copper recovery rate; the zinc grade of the zinc concentrate is 38.45 percent, the copper grade is 1.76 percent, the lead grade is 9.23 percent, and the zinc recovery rate is 77.45 percent. Compared with the embodiment 1, the copper concentrate has higher impurity content, low copper grade, higher lead and zinc content, and lower zinc concentrate grade, and the copper and zinc concentrate grade does not meet the requirements of qualified products.
Comparative example 2, a copper-zinc sequential preferential flotation process is adopted, 2000 g/ton of zinc sulfate, 1000 g/ton of sodium sulfite and 1000 g/ton of lime are added into the same iron-dressing total tailings, an ore pulp with the mass concentration of 35% is prepared by grinding through a ball mill, 60 g/ton of ethyl xanthate, 40 g/ton of butyl ammonium black lead and 60 g/ton of pine oil (stock solution) are added into the ore pulp, stirring is carried out for 2min, then copper roughing operation is carried out, 5000 g/ton of lime, 400 g/ton of copper sulfate and 120 g/ton of butyl xanthate are added into the ore pulp, zinc roughing is carried out, copper roughing is produced from the copper roughing concentrate after 3 times of fine concentration, and zinc roughing concentrate is produced from the zinc roughing concentrate after 3 times of fine concentration. According to detection, the copper grade, the lead grade and the zinc grade of the total tailings of iron separation described in the comparative example 2 are 0.54%, 0.46% and 1.9%; the copper concentrate obtained by the process method of the comparative example 2 has the copper grade of 10.23 percent, the lead grade of 10.12 percent, the zinc grade of 27.21 percent and the copper recovery rate of 70.23 percent; the zinc grade of the zinc concentrate is 38.23 percent, the copper grade is 0.78 percent, the lead grade is 8.23 percent, and the zinc recovery rate is 65.23 percent. Compared with the embodiment 1, the copper concentrate has higher impurity content, unqualified product quality, low zinc recovery rate and low zinc grade in the zinc concentrate.
Example 9, a method for reducing impurities in copper concentrate from copper zinc iron separation, comprising the steps of: step 1, adding 100 g/ton of sodium sulfide and 4000 g/ton of lime into iron-selecting total tailings before ore grinding operation, adding 50 g/ton of copper sulfate, 50 g/ton of butyl xanthate, 50 g/ton of ester-10550 g/ton and water into a stirring barrel, adjusting the concentration of ore pulp to 25%, and adjusting the pH of the ore pulp to be = 10; adding water and lime 2000 g/ton of raw ore and 1000 g/ton of raw ore into the first copper-zinc concentrate and the second copper-zinc concentrate respectively, wherein the concentration of the ore pulp is 20%, and adding water into the third copper-zinc concentrate to adjust the concentration of the ore pulp to be 20% and the pH value to be 10; obtaining copper-zinc concentrate and tailings through a closed flotation circulation process; step 2, taking the copper-zinc ore concentrate pulp in the step 1 as feeding ore, adding 200 g/ton of active carbon and 500 g/ton of sodium sulfide before regrinding operation, after grading treatment, adding 100 g/ton of sodium sulfide and 1500 g/ton of sodium metabisulfite into coarse fraction, adjusting the pulp concentration to 15%, and adjusting the pH =6 to separate copper from zinc minerals; the obtained flotation foam is combined with the graded fine fraction, water, 3000 g/ton sulfurous acid and 3000 g/ton sulfuric acid are added before the fine fraction copper-zinc separation, the slurry is adjusted to the concentration of 20 percent and the pH is =6, 100 g/ton sodium sulfide and 500 g/ton sulfurous acid are respectively added before the first copper concentrate and the second copper concentrate, and copper concentrate is obtained through a closed-circuit flotation circulation flow; adding 2000 g/t lime, 40 g/t butyl xanthate and 30 g/t pine oil, stirring, and producing zinc concentrate.
Through detection, the copper grade, the lead grade and the zinc grade in the total iron-selecting tailings described in the embodiment 1 are 0.85%, 0.72% and 3.25%; the copper concentrate obtained by the method has 22.43 percent of copper grade, 2.53 percent of lead grade, 5.67 percent of zinc grade and 75.32 percent of copper recovery rate; the zinc grade of the zinc concentrate is 49.23 percent, the copper grade is 1.21 percent, the lead grade is 8.23 percent, and the zinc recovery rate is 85.67 percent.
In comparative example 3, the traditional copper-zinc mixed flotation-copper-zinc separation process is adopted, lime and water are added into the same iron-dressing total tailings and ground in a ball mill until the pulp fineness reaches 12, the pulp concentration reaches 35%, then 300 g/t copper sulfate, 150 g/t butyl xanthate and 80 g/t pine alcohol oil are added into the same iron-dressing total tailings, and after stirring, copper-zinc mixed roughing and copper-zinc mixed concentration (the concentration pulp pH value is 12) are carried out, so as to obtain copper-zinc concentrate pulp. After regrinding, the copper-zinc ore concentrate pulp is added with 300 g/ton of sodium sulfide and 1000 g/ton of liquid sulfur dioxide, and then copper and zinc minerals are separated to obtain copper ore concentrate and zinc ore concentrate. According to detection, the copper grade, the lead grade and the zinc grade in the iron-selecting total tailings in the comparative example 3 are 0.85%, 0.72% and 3.25% respectively; the copper concentrate obtained by the process method of the comparative example 3 has the copper grade of 15.21 percent, the lead grade of 12.23 percent, the zinc grade of 18.34 percent and the copper recovery rate of 70.34 percent; the zinc grade of the zinc concentrate is 42.32 percent, the copper grade is 3.21 percent, the lead grade is 12.21 percent, and the zinc recovery rate is 80.32 percent.
Comparative example 4, a copper-zinc sequential preferential flotation process is adopted, 3000 g/ton of zinc sulfate, 1500 g/ton of sodium sulfite and 2000 g/ton of lime are added into the same iron-dressing total tailings, an ore pulp with the mass concentration of 35% is prepared by grinding through a ball mill, 80 g/ton of ethyl xanthate, 60 g/ton of butyl ammonium black and 60 g/ton of pine oil (stock solution) are added into the ore pulp, stirring is carried out for 2min, then copper roughing operation is carried out, 8000 g/ton of lime, 500 g/ton of copper sulfate and 150 g/ton of butyl xanthate are added into the ore pulp, zinc roughing is carried out, copper roughing is produced by carrying out 3 times of fine concentration on the copper roughing, and zinc roughing is produced by carrying out 3 times of fine concentration on the zinc roughing. According to detection, the copper grade, the lead grade and the zinc grade of the total tailings of iron separation described in the comparative example 4 are 0.85%, 0.72% and 3.25%; the copper concentrate obtained by the process method of the comparative example 4 has 9.34 percent of copper grade, 12.34 percent of lead grade, 29.32 percent of zinc grade and 74.54 percent of copper recovery rate; the zinc grade of the zinc concentrate is 42.43%, the copper grade is 1.56%, the lead grade is 10.22%, and the zinc recovery rate is 66.43%. Compared with the embodiment 1, the copper concentrate has higher impurity content, unqualified product quality, low zinc recovery rate and low zinc grade in the zinc concentrate.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept thereof within the scope of the present invention.

Claims (7)

1. A method for reducing impurities in copper concentrate from copper-zinc-iron separation is characterized by comprising the following steps:
step 1, carrying out iron selection on iron, copper and zinc ores, adding 50-100 g/ton of sodium sulfide and 2000 g/ton of lime into the total tailings after iron selection, grinding by using a ball mill, adding 30-50 g/ton of copper sulfate, 30-50 g/ton of butyl xanthate and 30-50 g/ton of ester-10530, stirring, and carrying out copper and zinc rough selection, wherein the concentration of rough selection ore pulp is 20-25%, the concentration of copper and zinc rough concentrate is 20% by adding water and 2000 g/ton of lime into the copper and zinc rough concentrate, and copper and zinc concentrate ore pulp is obtained;
step 2, adding 200 g/ton of activated carbon 100 and 500 g/ton of sodium sulfide 300 into the copper-zinc ore concentrate pulp obtained in the step 1, regrinding, classifying, adding 50-100 g/ton of sodium sulfide and 1500 g/ton of sodium pyrosulfite into a coarse fraction obtained after classification, separating copper from zinc minerals, wherein the pulp concentration is 10-15%, obtaining copper rough concentrate, combining the copper rough concentrate with a fine fraction obtained after classification, adding 3000 g/ton of sulfurous acid 2000 and 3000 g/ton of zinc sulfate 2000, separating copper from zinc minerals, obtaining secondary copper rough concentrate, adding 50-100 g/ton of sodium sulfide, 200 g/ton of sulfurous acid and 500 g/ton into the secondary copper rough concentrate, and obtaining copper concentrate through twice concentration, adding 2000 g/ton of lime into both the separation tailings of the coarse fraction and the separation tailings of the fine fraction, 40 g/ton of butyl xanthate and 30 g/ton of pine oil are subjected to once roughing and three times of fine separation to produce zinc concentrate.
2. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: 70 g/ton of sodium sulfide and 3000 g/ton of lime are added in the step 1.
3. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: in the step 1, 40 g/ton of copper sulfate, 40 g/ton of butyl xanthate and 40 g/ton of ester-10540 are added.
4. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: the concentration of the rougher pulp in the step is 23%.
5. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: and (2) adding 150 g/ton of activated carbon and 400 g/ton of sodium sulfide into the slurry in the step (2), grinding the mixture, grading the mixture, adding 70 g/ton of sodium sulfide and 1300 g/ton of sodium metabisulfite into the classified coarse fraction, and separating copper from zinc minerals, wherein the concentration of the slurry is 13%.
6. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: and 2500 g/ton of sulfurous acid and 2500 g/ton of zinc sulfate are added into the copper rough concentrate and the classified fine fraction in the step 2.
7. The method for reducing the impurity content of the copper concentrate for copper-zinc-iron separation according to claim 1, which is characterized in that: 70 g/ton of sodium sulfide and 300 g/ton of sulfurous acid are added into the copper rough concentrate in the step 2.
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