CN110560252A - Novel grading preselection-stirring mill-flotation process for improving quality of copper concentrate - Google Patents
Novel grading preselection-stirring mill-flotation process for improving quality of copper concentrate Download PDFInfo
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- CN110560252A CN110560252A CN201910736657.7A CN201910736657A CN110560252A CN 110560252 A CN110560252 A CN 110560252A CN 201910736657 A CN201910736657 A CN 201910736657A CN 110560252 A CN110560252 A CN 110560252A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
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Abstract
The invention discloses a new grading preselection-stirring mill-flotation process for improving the quality of copper concentrate, which takes flotation copper concentrate as a raw material and comprises the steps of concentration and reagent removal, grading preselection, stirring and grinding and copper flotation. According to the invention, most of the residual beneficiation reagent in the copper concentrate pulp is removed by concentration, according to the characteristics that the copper concentrate is fine in granularity and copper is enriched in fine fraction, fine-fraction high-grade copper concentrate is obtained by classifying and pre-separating through a cyclone, and the sand setting is reground and recleaning, so that the effective separation of impurity minerals and copper minerals is realized, and the purpose of improving the grade of the copper concentrate is realized. The invention aims to develop a simple and effective copper concentrate quality-improving and mineral-dressing process, and has important significance for improving the selling price of copper concentrate and reducing the transportation cost. The method has the characteristics of simple process, stable index and obvious quality improvement effect, and is favorable for popularization and application in similar mines.
Description
Technical Field
the invention relates to the field of non-ferrous metal beneficiation processes, in particular to a novel grading preselection-stirring mill-flotation process for improving the quality of copper concentrate.
Technical Field
the improvement of the grade of the copper concentrate for smelting is beneficial to reducing the transportation cost, reducing the consumption of raw materials and power, reducing the energy consumption, saving the construction investment cost and the like, and has important significance for reducing the copper smelting cost and improving the copper smelting recovery rate. Therefore, copper smelters generally require copper mines to produce higher grade copper concentrates.
Taking a certain porphyry type copper ore as an example, in order to produce high-grade copper concentrate, the most common means is to increase the dosage of inhibitors such as lime and the like in a concentrating mill, and although the method can improve the output grade of the copper concentrate, the method is not favorable for comprehensively recovering rare and expensive accompanying elements such as molybdenum, gold, silver and the like associated in the ore. Production practices prove that the collection of associated elements such as molybdenum, gold, silver and the like can be obviously inhibited due to the increase of the lime consumption, so that the recovery rate is reduced. In order to solve the contradiction between the copper concentrate grade and the recovery of associated elements, the process for reasonably reducing the copper concentrate grade produced by a concentrating mill, improving the recovery rate of the associated elements in the copper concentrate, then carrying out copper-molybdenum separation, obviously improving the recovery rate of molybdenum, and improving the copper concentrate grade to more than 25% after the copper-molybdenum separation is carried out, not only meets the copper smelting requirement, but also can improve the comprehensive utilization efficiency of resources.
The method has the advantages of short flow, simple operation, stable index and low cost, can improve the copper grade of the lower-grade copper concentrate after mineral separation, provides technical support for the process scheme of reducing the grade of the copper concentrate and improving the recovery rate of associated elements, has important significance for improving the economic benefit and the comprehensive utilization level of resources of mines, and has certain popularization value in similar mines.
Disclosure of Invention
the invention provides a novel grading preselection-stirring mill-flotation process for improving the quality of copper concentrates, which aims to solve the technical problem of improving the quality of the copper concentrates and provide a technical support for optimizing a mine beneficiation process. By grading and preselection, fine-grained copper concentrate with high grade, fine granularity and monomer dissociation is separated in advance, and the grinding and floating treatment capacity is greatly reduced; the coarse fraction sand setting is ground by a stirring mill, and compared with the conventional ball milling, the stirring mill has lower energy consumption and steel consumption, and can reduce the grinding cost; the coarse grain intergrowth is further dissociated by grinding, and copper minerals are further separated from pyrite and gangue minerals by flotation, so that the grade of copper concentrate is improved.
in order to achieve the technical aim, the embodiment of the disclosure discloses a new grading preselection-stirring mill-flotation process for improving the quality of copper concentrate, which utilizes the distribution characteristic that copper in the copper concentrate is enriched in a fine fraction, adopts a hydrocyclone to carry out grading preselection, separates out the fine fraction high-grade copper concentrate in advance, reduces the subsequent grinding and floating treatment capacity, realizes the copper-molybdenum separation firstly, and then improves the grade of the copper concentrate to more than 25%.
Further, particular embodiments include the steps of:
The process specifically comprises the following steps:
s1) concentration and removal of drugs: concentrating and dehydrating the copper concentrate by flotation so as to achieve the aim of removing the pesticide;
S2) stirring and size mixing: adding water into the concentrated and pesticide-removed copper concentrate, stirring and mixing to meet the grading requirement of a cyclone;
S3) grading preselection: feeding the copper concentrate subjected to size mixing into a cyclone for grading preselection to obtain graded overflow and settled sand, wherein an overflow product is fine-grained copper concentrate;
S4), stirring and grinding: feeding the graded settled sand into a stirring mill for ore grinding;
S5) flotation: the ore discharge of the stirring mill is fed into copper flotation operation, the flotation process comprises roughing and scavenging operation, and flotation agents are added step by step to finally obtain flotation copper concentrate and tailings; and (4) taking the flotation copper concentrate and the fine-fraction copper concentrate as the upgraded high-grade copper concentrate. (the order of the above steps is not adjustable).
according to the disclosed embodiment, the metal minerals in the flotation copper concentrate in S1) are chalcopyrite and pyrite, and the gangue minerals include sericite, quartz, dolomite and calcite; the copper grade in the flotation copper concentrate is less than 25% wt.
According to the embodiment of the disclosure, the fineness of the-0.038 mm size fraction in the flotation copper concentrate in S1) accounts for 30-60 wt% of the mass ratio.
according to the disclosed embodiment, the concentration of the copper concentrate ore pulp in the S1) is 30-45%; the concentration of the flotation copper concentrate after concentration and dehydration is more than 50 percent.
According to the embodiment of the disclosure, the concentration of the ore pulp after the pulp mixing in the S2) is 20-40% wt.
According to the embodiment of the disclosure, in the step S3), a hydrocyclone with the diameter phi of 150 mm-250 mm and the cone angle of 7-11 degrees is adopted for carrying out classification preselection operation, and the classification pressure is 0.10 MPa-0.20 MPa.
According to the embodiment of the disclosure, in the step S4), a vertical stirring mill is adopted to grind the cyclone sand setting, the grinding fineness is-0.038 mm, the content is not less than 50%, and the distribution rule characteristic that the finer the particle size is, the higher the copper grade is.
According to an embodiment of the present disclosure, in the flotation process described in S5), the modifier is lime, the collectors are ammonium butyl black and butyl xanthate, and the foaming agent is BK 204.
according to the embodiment of the disclosure, in the flotation process, lime is added into a stirring mill, and the using amount is 1500-2500 g/t; in the roughing operation, the dosage of the ammonium buterate black powder is 18-25 g/t, and the dosage of the butyl xanthate is 5-10 g/t; in the scavenging operation, the dosage of the ammonium nitrate black powder is 5-10 g/t, the dosage of the butyl xanthate is 10-15 g/t, and the dosage of the BK204 is 10-20 g/t.
according to the embodiment of the disclosure, the copper grade of the mixed high-grade copper concentrate is improved by more than three percent compared with that before treatment.
the technical advantages of the invention are as follows:
(1) The distribution characteristics of copper enriched in fine particle grades in the copper concentrate are fully utilized, the hydrocyclone is adopted for grading preselection, the fine particle grade high-grade copper concentrate is separated in advance, the subsequent grinding and floating treatment capacity is reduced, and the beneficiation treatment cost is obviously reduced.
(2) Compared with the traditional ball milling process, the stirring mill has the technical advantages of low energy consumption, low steel consumption, high ore milling efficiency and the like, and is favorable for reducing the ore milling cost.
(3) the flotation process is simple, the flow is short, the operation is simple, the flotation index is good and stable, the conventional flotation reagent is selected, and the overall flotation cost is low.
Drawings
Figure 1 is a flow diagram of the process of the present invention for the classification preselection-agitated mill-flotation for copper concentrate upgrading.
figure 2 is a flow diagram of a specific beneficiation process employing examples 1 and 2 of the process of the present invention.
Detailed Description
For the purpose of facilitating an understanding of the detailed concepts of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings. The scope of protection is not limited to the following examples.
Unless otherwise defined, the terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specified, the reagents and materials used in the present invention are commercially available products or products obtained by a known method.
As shown in fig. 1, the embodiment of the present disclosure discloses a new process of classification preselection-stirring mill-flotation for copper concentrate upgrading, and the specific embodiment comprises the following steps:
The process specifically comprises the following steps:
s1) concentration and removal of drugs: concentrating and dehydrating the copper concentrate by flotation so as to achieve the aim of removing the pesticide;
S2) stirring and size mixing: adding water into the concentrated and pesticide-removed copper concentrate, stirring and mixing to meet the grading requirement of a cyclone;
S3) grading preselection: feeding the copper concentrate subjected to size mixing into a cyclone for grading preselection to obtain graded overflow and settled sand, wherein an overflow product is fine-grained copper concentrate;
S4), stirring and grinding: feeding the graded settled sand into a stirring mill for ore grinding;
S5) flotation: the ore discharge of the stirring mill is fed into copper flotation operation, the flotation process comprises roughing and scavenging operation, and flotation agents are added step by step to finally obtain flotation copper concentrate and tailings; and (4) taking the flotation copper concentrate and the fine-fraction copper concentrate as the upgraded high-grade copper concentrate. (the order of the above steps is not adjustable).
According to the disclosed embodiment, in the flotation copper concentrate in S1), the metal minerals are chalcopyrite and pyrite, and the gangue minerals include sericite, quartz, dolomite and calcite; the copper grade in the flotation copper concentrate is less than 25% wt.
According to the embodiment of the disclosure, the content of the-0.038 mm size fraction in the flotation copper concentrate in S1) is 30-60 wt%.
according to the disclosed embodiment, the concentration of the copper concentrate ore pulp in the S1) is 30-45% wt; the concentration of the flotation copper concentrate after concentration and dehydration is more than 50 percent by weight.
According to the embodiment of the disclosure, the concentration of the ore pulp after the pulp mixing in the S2) is 20-40% wt.
according to the embodiment of the disclosure, in the step S3), a hydrocyclone with the diameter phi of 150 mm-250 mm and the cone angle of 7-11 degrees is adopted for carrying out classification preselection operation, and the classification pressure is 0.10 MPa-0.20 MPa.
according to the embodiment of the disclosure, in the step S4), a vertical stirring mill is adopted to grind the cyclone sand setting, the grinding fineness is-0.038 mm, the content is not less than 50%, and the distribution rule characteristic that the finer the particle size is, the higher the copper grade is.
According to an embodiment of the present disclosure, in the flotation process described in S5), the modifier is lime, the collectors are ammonium butyl black and butyl xanthate, and the foaming agent is BK 204.
According to the embodiment of the disclosure, in the flotation process, lime is added into a stirring mill, and the using amount is 1500-2500 g/t; in the roughing operation, the dosage of the ammonium buterate black powder is 18-25 g/t, and the dosage of the butyl xanthate is 5-10 g/t; in the scavenging operation, the dosage of the ammonium nitrate black powder is 5-10 g/t, the dosage of the butyl xanthate is 10-15 g/t, and the dosage of the BK204 is 10-20 g/t.
According to the embodiment of the disclosure, the copper grade of the mixed high-grade copper concentrate is improved by more than three percent compared with that before treatment.
Example 1:
In the copper concentrate in the embodiment, the copper grade is 21.06%, the associated gold and silver contents are 4.16g/t and 42.30g/t respectively, the copper minerals are mainly chalcopyrite, the impurity minerals are mainly pyrite, a small amount of gangue minerals are also contained, and the content of the gangue minerals with the fineness of-0.038 mm accounts for 54.36%. The process comprises the following specific steps:
(1) In the industrial test, flotation copper concentrate ore pulp after copper and molybdenum separation on site is taken, the concentration of the ore pulp is 42.50%, a thickener with the diameter of 30m is used for concentration, dehydration and reagent removal, and the underflow concentration of the thickener is 65.40%.
(2) the bottom flow of the thickener is added with water, stirred and mixed with pulp, and the concentration of the pulp is adjusted to 28 percent.
(3) and (3) after the copper concentrate ore pulp is subjected to size mixing, feeding the copper concentrate ore pulp into a hydrocyclone with the diameter of phi 150mm by using a pump for classification preselection, wherein the classification pressure is 0.12MPa, and obtaining fine copper concentrate and settled sand.
(4) And feeding the cyclone sand setting into a vertical stirring mill for grinding, wherein the content of the-0.038 mm-size fraction is 58.20%.
(5) After ore discharge of the stirring mill is added with water to adjust the concentration to 30%, flotation separation operation is carried out, the flotation adopts the process of once roughing, once scavenging and scavenging concentrate returning to ore grinding, and the detailed steps are as follows:
adding lime milk with the concentration of 8% into a stirring mill, wherein the using amount of CaO is 2200 g/t;
adding 21g/t of ammonium butyrate black powder and 7g/t of butyl xanthate in the flotation roughing operation;
③ 8g/t of ammonium butyl black drug, 12g/t of butyl xanthate and BK20410g/t are added in the flotation scavenging operation;
Example 1 the results of the test are shown in table 1.
Table 1 example 1 test results
example 2:
In the copper concentrate in the embodiment, the copper grade is 24.14%, the associated gold and silver contents are 3.42g/t and 36.90g/t respectively, the copper minerals are mainly chalcopyrite, the impurity minerals are mainly pyrite, a small amount of gangue minerals are also contained, and the content of the gangue minerals with the fineness of-0.038 mm accounts for 56.07 percent. The process comprises the following specific steps:
(1) The industrial test takes the flotation copper concentrate pulp after the copper and the molybdenum are separated on the spot, the pulp concentration is 44.25 percent, a thickener with the diameter of 30m is adopted for concentration, dehydration and reagent removal, and the underflow concentration of the thickener is 67.20 percent.
(2) The bottom flow of the thickener is added with water, stirred and mixed with pulp, and the concentration of the pulp is adjusted to 28 percent.
(3) And (3) after the copper concentrate ore pulp is subjected to size mixing, feeding the copper concentrate ore pulp into a hydrocyclone with the diameter of phi 150mm by using a pump for classification preselection, wherein the classification pressure is 0.12MPa, and obtaining fine copper concentrate and settled sand.
(4) And feeding the cyclone sand setting into a vertical stirring mill for grinding, wherein the content of the-0.038 mm-size fraction is 56.90%.
(5) After ore discharge of the stirring mill is added with water to adjust the concentration to 30%, flotation separation operation is carried out, the flotation adopts the process of once roughing, once scavenging and scavenging concentrate returning to ore grinding, and the detailed steps are as follows:
Adding lime milk with the concentration of 8% into a stirring mill, wherein the using amount of CaO is 2000 g/t;
adding 24g/t of ammonium butyrate black powder and 8g/t of butyl xanthate in the flotation roughing operation;
③ adding ammonium nitrate black powder 10g/t, butyl xanthate 12g/t and BK20410g/t in the flotation scavenging operation;
Example 2 the test results are shown in table 2.
table 2 example 2 test results
as can be seen from the ore dressing indexes of the two embodiments, the invention has ideal quality-improving effect on copper concentrates with different grades, and the grade of the copper concentrate can be stably improved by more than 3 percent; meanwhile, the recovery rates of associated gold and silver in the copper concentrate are high and respectively reach more than 99.10 percent and 98.60 percent.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications of the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (10)
1. A new grading preselection-stirring mill-flotation process for improving the quality of copper concentrate is characterized in that the process utilizes the distribution characteristic that copper in the copper concentrate is enriched in fine fraction, a hydrocyclone is adopted for grading preselection, fine fraction high-grade copper concentrate is separated in advance, the subsequent grinding and floating treatment capacity is reduced, copper and molybdenum separation is realized firstly, and then the grade of the copper concentrate is improved to more than 25%.
2. The process according to claim 1, characterized in that it comprises in particular the following steps:
s1) concentration and removal of drugs: concentrating and dehydrating the copper concentrate by flotation so as to achieve the aim of removing the pesticide;
S2) stirring and size mixing: adding water into the concentrated and pesticide-removed copper concentrate, stirring and mixing to meet the grading requirement of a cyclone;
s3) grading preselection: feeding the copper concentrate subjected to size mixing into a cyclone for grading preselection to obtain grading overflow and settled sand, wherein an overflow product is fine-grained copper concentrate;
S4), stirring and grinding: feeding the graded settled sand into a stirring mill for ore grinding;
S5) flotation: the ore discharge of the stirring mill is fed into copper flotation operation, the flotation process comprises roughing and scavenging operation, and flotation agents are added step by step to finally obtain flotation copper concentrate and tailings; and (4) taking the flotation copper concentrate and the fine-fraction copper concentrate as the upgraded high-grade copper concentrate.
3. The process according to claim 1, characterized in that: the metal minerals in the copper concentrate obtained by flotation in the step S1) are chalcopyrite and pyrite, and the gangue minerals comprise sericite, quartz, dolomite and calcite; the copper grade in the flotation copper concentrate is less than 25 percent.
4. the process according to claim 1, characterized in that: the mass fraction of the flotation copper concentrate with the fineness of-0.038 mm in the S1) is 30-60%; the concentration of the copper concentrate ore pulp subjected to medium flotation is 30-45 wt%; the concentration of the flotation copper concentrate after concentration and dehydration is more than 50 percent by weight.
5. The process according to claim 1, characterized in that: the concentration of the ore pulp after size mixing in the S2) is 20-40% by weight.
6. The process according to claim 1, characterized in that: and in the S3), a hydrocyclone with the diameter phi of 150 mm-250 mm and the cone angle of 7-11 degrees is adopted for carrying out classification pre-selection operation, and the classification pressure is 0.10 MPa-0.20 MPa.
7. The process according to claim 1, characterized in that: and S4), grinding the sand setting of the cyclone by using a vertical stirring mill, wherein the grinding fineness is-0.038 mm, and the mass ratio of the grinding fineness is not less than 50 wt%.
8. the process according to claim 1, characterized in that: in the flotation process in the step S5), the regulator is lime, the collectors are ammonium butyrate black and butyl xanthate, and the foaming agent is BK 204.
9. the process according to claim 8, characterized in that: in the flotation process, lime is added into a stirring mill, and the using amount is 1500-2500 g/t; in the roughing operation, the dosage of the ammonium buterate black powder is 18-25 g/t, and the dosage of the butyl xanthate is 5-10 g/t; in the scavenging operation, the dosage of the ammonium nitrate black powder is 5-10 g/t, the dosage of the butyl xanthate is 10-15 g/t, and the dosage of the BK204 is 10-20 g/t.
10. The process according to claim 1, characterized in that: compared with the copper grade before treatment, the high-grade copper concentrate has the advantage that the copper grade is improved by more than three percent.
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Cited By (1)
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| CN113426569A (en) * | 2021-06-22 | 2021-09-24 | 北京矿酷数科信息技术有限公司 | Novel metal ore dressing method |
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Address after: 330096 No. 15 Metallurgical Avenue, Guixi City, Yingtan City, Jiangxi Province Applicant after: JIANGXI COPPER Corp.,Ltd. Address before: 330096 No. 7666, Dong Dong Avenue, Jiangxi, Nanchang Applicant before: JIANGXI COPPER Corp.,Ltd. |
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Application publication date: 20191213 |