CN113369011A - Method for gradient recovery of pyrite mineral from copper-dressing tailings - Google Patents

Method for gradient recovery of pyrite mineral from copper-dressing tailings Download PDF

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CN113369011A
CN113369011A CN202110599043.6A CN202110599043A CN113369011A CN 113369011 A CN113369011 A CN 113369011A CN 202110599043 A CN202110599043 A CN 202110599043A CN 113369011 A CN113369011 A CN 113369011A
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tailings
magnetic
sulfur
concentrate
copper
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彭时忠
许家和
张驰
庞勃
丁鹏
郭运鑫
张群英
吴娜娜
王周和
朱继生
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Anhui Tongguan Industrial Technology Research Institute Co ltd
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Tongling Nonferrous Metals Group Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • B03B9/06General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/52Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Abstract

The invention discloses a method for recovering pyrite mineral from copper-dressing tailings in a gradient manner, which comprises the following steps: s1, carrying out low-intensity magnetic separation on the copper tailings to separate iron; s2, performing flotation and desulfurization on the concentrated ore by weak magnetism; s3, desulfurization foam enhanced flotation; and S4, grinding the desulfurization foam flotation tailings again for strong magnetic separation. The method comprises the steps of performing weak magnetic roughing, weak magnetic roughing concentrate grinding, weak magnetic concentration and weak magnetic concentration concentrate flotation and desulfurization on copper tailings to obtain various classified products; the obtained magnetite powder for fine-grade coal separation with the sulfur content of less than 2 percent and the magnetic substance content of more than 95 percent is applied to magnetite powder with higher fineness requirements such as a dense medium cyclone, an inclined wheel (or vertical wheel) dense medium separator and the like, and the obtained magnetite powder is Ti4+、Mg2+And Mn2+The grade is obviously reduced, the reduction of the magnetism of the magnetite powder can be effectively avoided, the property stability of the prepared suspension is improved, the consumption of media in the production process is reduced, and the cost of the coal preparation process is reduced.

Description

Method for gradient recovery of pyrite mineral from copper-dressing tailings
Technical Field
The invention relates to the technical field of mineral separation engineering for recovering pyrite minerals, in particular to a method for recovering pyrite minerals from copper separation tailings in a gradient manner.
Background
With the rapid development of social economy, the consumption of copper metal in China is rapidly increased, the copper yield is continuously the first in the world for many years, the copper-selecting tailings with huge quantity are generated, and the copper-selecting tailings usually contain considerable sulfur and iron resources with higher economic recovery value. However, due to the requirements of technology, process scale and the like, on one hand, the sulfur content in iron ore concentrate produced by a plurality of copper concentration plants is often over-standard, in the smelting process, part of sulfur in the iron ore concentrate is generated in the form of harmful gaseous sulfide, which causes adverse effects on the environment, and the other part of sulfur enters into pig iron, so that the sulfur-containing pig iron generates phenomena of 'hot brittleness' and the like during hot processing, and the product quality of steel is reduced. On the other hand, the recovery rate of the sulfur and iron resources is low, and the sulfur and iron resources are not fully and comprehensively recycled, so that the development and utilization of mineral resources are greatly influenced. Therefore, with the increasing exhaustion of mineral resources, the method for effectively recovering the sulfur and iron resources from the copper tailings has wide economic and social benefits.
A large amount of pyrite, magnetite, pyrrhotite and the like usually exist in copper ore deposits, the ores contain rich pyrite resources, and many mines similar to the ore deposits in China, such as the copper mine wax gourd cuprite, the Angonggute and the like. The method comprises the steps of firstly, carrying out copper mineral separation by using a flotation method, wherein when a copper-sulfur mixed flotation process is adopted, most of sulfur of non-magnetic sulfides can float out along with copper minerals, and sulfur of magnetic sulfides mainly comprising monoclinic pyrrhotite can be remained in the rest copper-separation tailings to enter the sulfur-iron separation operation. For iron resources, the iron of magnetite and the iron of magnetic sulfur are difficult to obtain by the traditional flotation method, most of the magnetite and the iron of magnetic sulfur are discharged along with the copper tailings and enter into the sulfur and iron separation operation, while the iron floatability of other sulfide ores is better, and most of the magnetite and the iron of magnetic sulfur are produced along with the mixed flotation operation.
When the sulfur and iron resources are actually recovered, the situation that the high sulfur and iron concentrate obtained from the desulfurization foam is not high enough often occurs, because the TFe grade is between 50% and 55%, and the TS content is between 12% and 15%, the high sulfur and iron concentrate can not be used as iron concentrate, and can not be used as sulfur concentrate, and because the desulfurization difficulty is large, the high sulfur and iron concentrate can not be prepared into heavy media, and can only be used as the ore blending of the low sulfur and iron concentrate, but also because the sulfur content is too high, the use amount of the high sulfur and iron concentrate used as the ore blending is limited, and the resource waste is caused. Meanwhile, after the high-sulfur iron concentrate is separated, the residual slag still contains a certain amount of pyrite substances, which include sulfur minerals with a slow floating speed in the desulfurization operation, mainly pyrrhotite, and part of iron concentrate which is mixed with the desulfurization foam, and the part of slag, such as the iron concentrate or heavy medium product, still can not reach the product standard due to the high sulfur content, so the slag is usually discharged as tailings and is not effectively recycled.
Aiming at the problems, partial research schemes exist at present, for example, the invention patent application with the publication number of CN110560269A discloses a beneficiation method for gradient recycling of high-sulfur magnetite concentrate, wherein the high-sulfur magnetite concentrate is subjected to ore grinding-low-intensity magnetic separation to obtain low-intensity magnetic separation iron concentrate with the TFe grade of more than or equal to 64.0% and the TS of more than or equal to 10.0%, the low-intensity magnetic separation iron concentrate is subjected to primary sulfur-floating roughing, primary sulfur-floating concentration and primary sulfur-floating scavenging to obtain high-iron sulfur concentrate with the TS grade of more than 24.0% and the TFe grade of more than 60.0%, and primary scavenging sulfur-floating tailings are discharged; the primary scavenging sulfur flotation tailings are subjected to open-circuit operation of scavenging sulfur flotation to obtain iron ore concentrate with the iron grade of more than 66.5 percent and the TS content of less than 1.2 percent and a heavy medium product with the iron grade of more than 62.5 percent, but the sulfur grade of the heavy medium product is as high as 15.48 percent.
For another example, the patent application of the invention in China with the publication number of CN112058500A discloses a beneficiation method for comprehensively utilizing a magnetite concentrate flotation desulfurization foam product, which adopts the following processes: (1) performing low-intensity magnetic separation, ore grinding and low-intensity magnetic separation on the flotation desulfurization foam product of the magnetite concentrate; (2) performing closed-loop flotation on the tailings subjected to low-intensity magnetic separation by using first-rough-second-fine-first-sweep flotation, wherein sodium silicate is used as a dispersing agent, butyl xanthate is used as a collecting agent, and No. 2 oil is used as a foaming agent; (3) carrying out low-intensity magnetic separation on iron ore concentrate, namely primary coarse flotation and secondary fine flotation and desulfurization, taking citric acid as a complexing agent and an activating agent, taking butyl xanthate as a collecting agent and taking No. 2 oil as a foaming agent. Four products of high-iron-sulfur concentrate, high-sulfur-iron concentrate, low-sulfur-iron concentrate and sulfur concentrate obtained by the method are sold in the market, the sulfuric acid slag generated after the acid preparation of the high-iron-sulfur concentrate can be directly used as iron concentrate, the high-sulfur-iron concentrate is used as a dense medium for ore blending or coal dressing, and the sulfur grade of the high-sulfur-iron concentrate is up to 7.08%.
The dense medium is widely popularized and applied to the coal industry in two years, and the dense medium coal separation is a novel process technology developed for meeting the requirement of the market on low-ash coal. Most countries attach great importance to coal washing, especially developed countries. China has late application but fast development, and has very wide market prospect with the continuous progress of process technology. The dense medium which is commonly used at present is magnetite powder basically. Fe due to the oxygen ion radius of about (0.132nm) therein2+Middle, Fe3+And minimum. Due to Ti4+、Mg2+、Mn2+Many of these cations have similar ionic radii to the iron ions, so some of the iron ions are replaced by these ions in some magnetite, resulting in reduced magnetic properties of the magnetite and ultimately in a large consumption of media. Meanwhile, along with the wide application of a pressureless feeding three-product heavy medium cyclone in recent years, particularly for separating raw coal without slime separation, the magnetite powder is required to reach four types of standards, meanwhile, the content of a magnetic substance is not less than 95%, the content of S in impurities is not more than 2%, and otherwise, the medium consumption is very high. The heavy media obtained by the two methods disclosed above are far from achieving the effect of reducing the media consumption.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for recovering pyrite minerals from copper dressing tailings in a gradient manner, wherein pyrite resources in the copper dressing tailings are recovered in a gradient manner, and economic benefits and advantages of each other are fully exerted according to different pyrite contents of respective products, and particularly, heavy medium products meeting the standard requirements are separated from desulfurization foams and can be used as magnetite powder for fine-grade coal dressing.
The technical scheme adopted by the invention is as follows: a method for gradient recovery of pyrite mineral from copper dressing tailings comprises the following steps: s1, carrying out low-intensity magnetic separation on copper tailings: carrying out weak magnetic roughing, weak magnetic roughing concentrate grinding and weak magnetic concentration operation on the copper tailings subjected to the copper-sulfur mixed flotation operation in sequence; taking the obtained weak magnetic concentration concentrate as a desulfurization operation feed, combining the magnetic roughing tailings and the magnetic concentrate tailings, and filling a sand silo or discharging the mixture to a tailing pond; s2, performing flotation and desulfurization on the concentrated ore by weak magnetism: carrying out secondary roughing operation on the weakly magnetic concentrated concentrate obtained in the step S1 to select sulfur, so as to obtain desulfurized foam with TS taste of 10% -15% and TFe grade of 52% -60%, and coarse fraction low-sulfur iron concentrate with TS grade of less than 0.6% and TFe grade of more than 65%; s3, desulfurization foam enhanced flotation: performing enhanced flotation on the desulfurized foam obtained in the step S2 by adopting three-coarse-one-fine closed-circuit flotation operation to obtain high-sulfur iron concentrate with TS grade being more than 22 percent and TFe grade being more than 62 percent and desulfurized foam rougher tailings with TS grade being 1-3 percent and TFe grade being 45-50 percent; s4, regrinding the desulfurization foam flotation tailings and performing strong magnetic separation: and (3) regrinding the desulfurized foam rougher tailings obtained in the step (S3) and then carrying out strong magnetic separation to obtain fine-grained low-sulfur iron concentrate with the TS grade of less than 2%, the TFe grade of more than 64% and the fineness of-0.045 mm accounting for more than 80%.
As a further improvement of the invention, in the S3, the selected tailings are returned to the desulfurization foam for primary roughing.
As a further improvement of the invention, in S1, the low-intensity magnetic separation operation equipment adopts a permanent magnet drum magnetic separator, the magnetic field intensity of the low-intensity magnetic roughing is 2000 Gs-2200 Gs, the magnetic field intensity of the low-intensity magnetic concentration is 1800 Gs-2000 Gs, and the grinding fineness is controlled to be-0.074 mm and accounts for 70% -75%.
As a further improvement of the invention, the dosage of the sulfuric acid for primary roughing in S2 is 300-500 g/t, the dosage of the butyl xanthate is 200-300 g/t, and the dosage of the No. 2 oil is 20-30 g/t; the dosage of the secondary crude butyl xanthate is 50-100 g/t, and the dosage of the No. 2 oil is 5-15 g/t.
As a further improvement of the invention, the dosage of the crude butyl xanthate in S3 is 20-30 g/t, and the dosage of the No. 2 oil is 2-4 g/t; the dosage of the secondary and tertiary crude butyl yellow is 5-10 g/t, and the dosage of the 2# oil is 1-2 g/t; the dosage of the selected butyl yellow is 5-10 g/t.
As a further improvement of the invention, the strong magnetic separation operation equipment in the S4 adopts a permanent magnetic drum type magnetic separator, the magnetic field intensity is 2500 Gs-3000 Gs, and the regrinding degree is controlled to-0.045 mm and accounts for 82% -85%.
The invention has the following beneficial effects:
(1) the invention realizes the grading of sulfur and iron resources for the copper tailings, and the obtained coarse-grained low-sulfur iron ore concentrate can be sold to a smelting plant as an iron ore concentrate product through weak magnetic roughing, weak magnetic roughing concentrate grinding, weak magnetic concentration and weak magnetic concentration concentrate flotation desulphurization; the high-sulfur iron concentrate obtained by the desulfurization foam enhanced flotation operation can be used for preparing sulfuric acid, and acid sludge after acid preparation can be directly sold to a smelting plant as red powder; the fine-grained low-sulfur iron ore concentrate obtained after regrinding and strong magnetic separation of the desulfurized foam rougher tailings can be sold as a dense medium product.
(2) The fine-grained low-sulfur iron ore concentrate has low fineness, has wider application range in the coal separation field, and can be applied to magnetite powder with higher fineness requirements, such as a dense medium cyclone, an inclined wheel (or vertical wheel) dense medium separator and the like.
(3) The fine-grained low-sulfur iron ore concentrate has high iron grade and the sulfur grade is lower than 2 percent, so that the consumption of media in coal dressing can be obviously reduced, and the cost is greatly reduced.
(4) Ti in fine-grained low-sulphur iron concentrate compared to iron concentrate products normally used for heavy-media feeds4+、Mg2+And Mn2+The grade is obviously reduced, the reduction of the magnetism of the magnetite powder can be effectively avoided, the property stability of the prepared suspension is improved, the consumption of media in the production process is reduced, and the cost of the coal preparation process is further reduced.
(5) The process flow has wide applicability, and is particularly suitable for the copper-dressing tailings containing pyrrhotite.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic view of embodiment 1 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
Example 1 the copper tailings used were obtained from a copper ore dressing plant, Anhui, and the sulfur phase analysis results of the copper tailings are shown in Table 1, and the iron phase analysis results are shown in Table 2.
TABLE 1 Sulfur phase analysis results of copper tailings
Sulfur phase difference Sulfur of magnetic sulfides Sulfur of non-magnetic sulfide Total up to
Sulfur content/%) 1.19 0.11 1.30
Occupancy/%) 91.54 8.46 100.00
Table 2 iron phase analysis results of copper tailings
Figure BDA0003092248150000051
Figure BDA0003092248150000061
According to the analysis of the pyrite phase of the copper tailings, the copper tailings contain part of magnetic pyrite minerals, the sulfur content of the magnetic sulfides is 1.19%, and the sulfur content of the non-magnetic sulfides is 0.11%; the TFe content was 32.42%.
The method for recovering the pyrite mineral from the copper dressing tailings in a gradient manner comprises the following steps:
(1) carrying out magnetic separation on copper-selecting tailings: firstly, carrying out weak magnetic roughing, weak magnetic roughing concentrate grinding and weak magnetic concentration operation on copper tailings, wherein the obtained weak magnetic concentration concentrate is used as a desulfurization operation feed, the TS grade of the concentrate is 2.34%, the TFe grade of the concentrate is 64.83%, the magnetic roughing tailings and the magnetic concentrate tailings are combined and then filled into a sand silo or discharged into a tailing pond, the TS grade of the tailings is 0.57%, and the TFe grade of the tailings is 9.74%.
In the step, the low-intensity magnetic separation operation equipment adopts a permanent magnet barrel type magnetic separator, the magnetic field intensity of the low-intensity magnetic roughing is 2000Gs, and the magnetic field intensity of the low-intensity magnetic concentration is 1800 Gs. The grinding fineness of-0.074 mm accounts for 72.25%.
(2) Performing weak magnetic concentration concentrate flotation and desulfurization: and (2) carrying out secondary roughing on the weak magnetic concentration concentrate with the TS grade of 2.34% and the TFe grade of 64.83% obtained in the step (1) to obtain desulfurized foam with the TS grade of 10.29% and the TFe grade of 55.42%, and coarse fraction low-sulfur iron concentrate with the TS grade of 0.48% and the TFe grade of 67.02%.
The reagent system of the flotation and desulfurization operation of the weakly magnetic concentration concentrate comprises the following steps: sulfuric acid is used as a regulator, butyl xanthate is used as a collecting agent, and 2# oil is used as a foaming agent; the dosage of the flotation reagent is calculated according to the dry ore content of the copper tailings: 400g/t of sulfuric acid for primary roughing, 200g/t of butyl xanthate and 20g/t of foaming agent No. 2 oil; the dosage of the secondary crude buthium chinense is 50g/t, and the dosage of the foaming agent No. 2 oil is 10 g/t.
The obtained coarse fraction low-sulfur iron ore concentrate can be sold to a smelting plant as a high-grade iron ore concentrate product.
(3) Desulfurization foam enhanced flotation: and (3) performing three-coarse-one-fine closed-circuit flotation on the desulfurized foam with the TS grade of 10.29% and the TFe grade of 55.42% obtained in the step (2) to obtain high-sulfur iron concentrate with the TS grade of 22.86% and the TFe grade of 63.15%, and desulfurized foam rougher tailings with the TS grade of 1.16% and the TFe grade of 49.70%, and returning the selected tailings to the desulfurized foam first roughing.
The reagent system of the flotation and desulfurization operation of the weakly magnetic concentration concentrate comprises the following steps: butyl xanthate is a collecting agent, and 2# oil is a foaming agent; the dosage of the flotation reagent is calculated according to the dry ore content of the copper tailings: the dosage of the xanthate for the first time is 20g/t, and the dosage of the foaming agent No. 2 oil is 2 g/t; the dosage of the xanthate for the secondary roughing and the third roughing is 5g/t, and the dosage of the foaming agent No. 2 oil is 1 g/t; the dosage of the selected butyl yellow is 5 g/t.
The obtained high-sulfur iron concentrate can be used as a raw material for preparing acid in a sulfuric acid plant, and acid sludge after acid preparation can be sold to a smelting plant as red powder.
(4) Regrinding the desulfurization foam flotation tailings and performing strong magnetic separation: and (3) regrinding the desulfurized foam flotation tailings with the TS grade of 1.16% and the TFe grade of 49.70% obtained in the step (3), performing strong magnetic separation to obtain fine low-sulfur iron ore concentrate with the TS grade of 1.64%, the TFe grade of 64.31% and the fineness of-0.045 mm accounting for 81.62%, and determining the content of magnetic substances to be 95.68% by adopting a magnetic separation tube.
In this step, the regrinding degree was-0.045 mm in 83.17%. The strong magnetic separation operation equipment adopts a permanent magnetic cylinder type magnetic separator, and the magnetic field intensity of the strong magnetic cylinder type magnetic separator is 2700 Gs.
The obtained fine-grained low-sulfur iron ore concentrate serving as a dense medium meets the coal industry standard, can be used as magnetite powder for fine-grade coal separation, and is applied to magnetite powder with higher fineness requirements such as a dense medium cyclone, an inclined wheel (or vertical wheel) dense medium separator and the like.
Table 3 example 1 test protocol pyrite resource data is as follows:
Figure BDA0003092248150000071
table 4 example 1 experimental protocol ion data for iron ions are as follows:
Figure BDA0003092248150000081
it can be seen from tables 3 and 4 that the sulfur grade in the fine low-sulfur iron ore concentrate is 1.64% and lower than 2%, the consumption of medium quality during coal dressing can be remarkably reduced, the iron grade is up to 64.31%, the fineness is-0.045 mm and accounts for 81.62%, and the fine low-sulfur iron ore concentrate can be used for magnetite powder of heavy medium cyclone and inclined wheel (or vertical wheel) heavy medium sorting machine. In addition, Ti of fine-grained low-sulfur iron concentrate4+、Mg2+And Mn2+The grades are respectively 0.018%, 1.07% and 0.053%, the grades of the coarse-grained low-sulfur iron ore concentrate are respectively reduced by 48.57%, 48.09% and 46.49%, the iron ion substitute ions are greatly reduced, the reduction of the magnetism of the magnetite powder is directly avoided, the stability of the properties of the prepared suspension liquid during coal dressing is ensured, and the consumption of media in the production process is further reduced.
Example 2, compared with example 1, the difference lies in that the magnetic field intensity of weak magnetic roughing in S1 is 2200Gs, the magnetic field intensity of weak magnetic cleaning is 2000Gs, and the grinding fineness is controlled to be 75% in-0.074 mm; in S4, the magnetic field intensity is 3000Gs, and the degree of grinding is controlled to-0.045 mm, which is preferably 85%. The fine-grained low-sulfur-iron concentrate obtained in example 2 is used as heavy medium in coal dressing and washing, and contains Ti4+,Mg2+,Mn2+The grade is relatively lower and the dielectric loss is also lower.
Table 5 example 2 test protocol pyrite resource data is as follows:
Figure BDA0003092248150000082
table 6 example 2 experimental protocol ion data for iron ions are as follows:
Figure BDA0003092248150000091
example 3, compared with example 1, the difference is that the dosage of the primary crude butyl xanthate in S3 is 30g/t, and the dosage of the No. 2 oil is 4 g/t; the dosage of the secondary and tertiary crude selection butyl yellow is 10g/t, and the dosage of the 2# oil is 2 g/t; the dosage of the selected butyl yellow is 10 g/t. The fine-grained low-sulfur iron concentrate obtained in example 3 has a lower sulfur grade and also has lower medium loss in coal washing.
Table 5 example 3 test protocol pyrite resource data is as follows:
Figure BDA0003092248150000092
table 6 example 3 experimental protocol ion data for iron ions are as follows:
Figure BDA0003092248150000093
the invention provides a method for gradient recovery of a sulfur-iron mineral from copper-dressing tailings, which comprises the steps of firstly carrying out low-intensity magnetic separation and flotation desulphurization on the copper-dressing tailings to obtain coarse-grained low-sulfur-iron ore concentrate, then continuing to carry out large-open long-flow enhanced flotation desulphurization on desulphurization foam to obtain high-sulfur-iron ore concentrate, completely separating the sulfur mineral, particularly fully recovering pyrrhotite with slow floating speed, greatly reducing the sulfur content of residual slag which is usually subjected to waste treatment after the high-sulfur-iron ore concentrate is separated from the desulphurization foam, and finally carrying out regrinding and high-intensity magnetic separation to obtain fine-grained low-sulfur-iron ore concentrate with extremely low sulfur content, and effectively reducing Ti content4+,Mg2+,Mn2+The content of the magnetite powder can be used as a dense medium product with high standard grade for sale, the magnetite powder is applied to fine-grade coal dressing, the consumption is obviously reduced in the using process, part of magnetite substances mixed with the desulfurized foam is fully recycled, and the resource waste is avoided.
The invention carries out weak magnetic roughing, weak magnetic roughing concentrate grinding, weak magnetic concentration and weak magnetic concentration concentrate flotation and desulfurization on the copper tailings, and the obtained coarse-grained low-sulfur iron concentrate can be sold to a smelting plant as an iron concentrate product; the high-sulfur iron concentrate obtained by the continuous flotation operation of the desulfurized foam can be used for preparing sulfuric acid, and acid sludge after acid preparation can be directly sold to a smelting plant as red powder;the desulfurized foam rougher tailings are reground and subjected to strong magnetic separation to obtain a dense medium with the sulfur content of less than 2% and the magnetic substance content of more than 95%, and the dense medium can be used as magnetite powder for fine-grade coal dressing. The three products have market sales, and the sulfur and iron resources in the copper tailings are graded in a gradient way, particularly the dense medium product which has relatively high market value and relatively short resources and can be used as magnetite powder for fine-grade coal separation is obtained from the desulfurization foam, the sulfur content of the dense medium product is lower than 2 percent, and Ti content is lower than that of the dense medium product4+,Mg2+,Mn2+The content is low, the magnetic property reduction of magnetite powder is avoided, the stability of the properties of the prepared suspension liquid during coal dressing is ensured, and the consumption of media in the production process is further reduced. The invention realizes the high-efficiency utilization, comprehensive utilization and maximum benefit of the sulfur and iron resources in the copper tailings, avoids the loss of the sulfur and iron resources in a large amount of copper tailings, and obtains unexpected technical effect and economic effect. The invention has mature process flow, the used flotation reagents are all common reagents in the market, the field practical application is convenient, and the invention is suitable for popularization.
It should be understood by those skilled in the art that the protection scheme of the present invention is not limited to the above-mentioned embodiments, and various permutations, combinations and modifications can be made on the above-mentioned embodiments without departing from the spirit of the present invention, and the modifications are within the scope of the present invention.

Claims (6)

1. A method for gradient recovery of pyrite mineral from copper dressing tailings comprises the following steps:
s1, carrying out low-intensity magnetic separation on copper tailings: carrying out weak magnetic roughing, weak magnetic roughing concentrate grinding and weak magnetic concentration operation on the copper tailings subjected to the copper-sulfur mixed flotation operation in sequence; taking the obtained weak magnetic concentration concentrate as a desulfurization operation feed, combining the magnetic roughing tailings and the magnetic concentrate tailings, and filling a sand silo or discharging the mixture to a tailing pond;
s2, performing flotation and desulfurization on the concentrated ore by weak magnetism: carrying out secondary roughing operation on the weakly magnetic concentrated concentrate obtained in the step S1 to select sulfur, so as to obtain desulfurized foam with TS taste of 10% -15% and TFe grade of 52% -60%, and coarse fraction low-sulfur iron concentrate with TS grade of less than 0.6% and TFe grade of more than 65%;
s3, desulfurization foam enhanced flotation: performing enhanced flotation on the desulfurized foam obtained in the step S2 by adopting three-coarse-one-fine closed-circuit flotation operation to obtain high-sulfur iron concentrate with TS grade being more than 22 percent and TFe grade being more than 62 percent and desulfurized foam rougher tailings with TS grade being 1-3 percent and TFe grade being 45-50 percent;
s4, regrinding the desulfurization foam flotation tailings and performing strong magnetic separation: and (3) regrinding the desulfurized foam rougher tailings obtained in the step (S3) and then carrying out strong magnetic separation to obtain fine-grained low-sulfur iron concentrate with the TS grade of less than 2%, the TFe grade of more than 64% and the fineness of-0.045 mm accounting for more than 80%.
2. The method for gradient recovery of pyrite mineral from copper tailings as claimed in claim 1, wherein said S3, the concentrated tailings are returned to desulfurization foam for one roughing.
3. The method for gradient recovery of pyrite mineral from copper tailings as claimed in claim 1, wherein in S1, the operation equipments for weak magnetic separation all use permanent magnet drum magnetic separator, the magnetic field strength for weak magnetic roughing is 2000 Gs-2200 Gs, the magnetic field strength for weak magnetic concentration is 1800 Gs-2000 Gs, and the grinding fineness is controlled to-0.074 mm, which accounts for 70% -75%.
4. The method for gradient recovery of pyrite mineral from copper tailings as claimed in claim 1, wherein the amount of sulfuric acid for primary roughing in S2 is 300-500 g/t, the amount of butyl xanthate is 200-300 g/t, and the amount of oil # 2 is 20-30 g/t; the dosage of the secondary crude butyl xanthate is 50-100 g/t, and the dosage of the No. 2 oil is 5-15 g/t.
5. The method for gradient recovery of pyrite mineral from copper tailings according to claim 1, wherein the dosage of butyl xanthate in primary roughing in S3 is 20-30 g/t, and the dosage of 2# oil is 2-4 g/t; the dosage of the secondary and tertiary crude butyl yellow is 5-10 g/t, and the dosage of the 2# oil is 1-2 g/t; the dosage of the selected butyl yellow is 5-10 g/t.
6. The method as claimed in any one of claims 1 to 5, wherein the strong magnetic separation operation equipment in S4 adopts a permanent magnetic drum magnetic separator, the magnetic field strength is 2500 Gs-3000 Gs, and the re-grinding degree is controlled to-0.045 mm, which accounts for 82% -85%.
CN202110599043.6A 2021-05-31 2021-05-31 Method for gradient recovery of pyrite mineral from copper-dressing tailings Pending CN113369011A (en)

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