CN109833979B - Method for recovering molybdenite from copper concentration tailings - Google Patents
Method for recovering molybdenite from copper concentration tailings Download PDFInfo
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- CN109833979B CN109833979B CN201910273017.7A CN201910273017A CN109833979B CN 109833979 B CN109833979 B CN 109833979B CN 201910273017 A CN201910273017 A CN 201910273017A CN 109833979 B CN109833979 B CN 109833979B
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Abstract
The invention discloses a method for recovering molybdenite from copper concentration tailings, which comprises the steps of firstly concentrating copper concentration tailing pulp to be treated by a thickener and a centrifugal machine; adding water into the concentrated ore pulp for size mixing; introducing the treated ore pulp into a roughing flotation unit, and sequentially adding a regulator, a pyrite inhibitor, a molybdenite collecting agent and a foaming agent in sequence to stir and roughen to obtain molybdenum rough concentrate and roughed tailings; adding a pyrite inhibitor BK-YS and a molybdenite collector BK-PM into the rougher tailings to perform scavenging for 1-2 times; and adding a pyrite inhibitor BK-YS into the molybdenum rough concentrate for concentration to obtain the molybdenum concentrate. The method has good separation effect on the molybdenite in the copper concentration tailings, so that the molybdenite can be fully recovered, and the comprehensive utilization level of mineral resources is improved.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a method for recovering molybdenite from copper concentration tailings.
Background
Molybdenum is a relatively scarce resource with an abundance of 0.00011% in the earth's crust. In daily life, molybdenum is widely applied, and steel alloy additives, molybdenum-based alloys and chemical products belong to three application fields of molybdenum. In nature, more than 30 kinds of molybdenum-containing minerals are found, and molybdenite, wulfenite, calcium molybdate ore and the like are common. The most important of all minerals is molybdenite, the raw materials of the global molybdenum industry almost all depend on the molybdenite, and the proportion of other minerals is very low. Molybdenite, in addition to forming a single molybdenum deposit, is widely used in the co-production with other sulfide ores to form multi-metal deposits, such as copper molybdenum sulfide deposits, tungsten molybdenum bismuth deposits, and the like. Among them, molybdenum recovered from copper-molybdenum ore accounts for about half of the total yield. Therefore, the method has important significance for recycling molybdenite resources by strengthening the innovation of the theory and technology of molybdenum separation of copper-molybdenum ores.
In the prior art, the copper-molybdenum ore is generally treated by a copper-molybdenum mixed flotation-copper-molybdenum separation process. In the mixed flotation and concentration operation of copper and molybdenum, a large amount of lime is often added to inhibit pyrite in a high pH system, so that copper and molybdenum minerals are separated from the pyrite, and effective enrichment and recovery of copper and molybdenum are realized. Due to the large lime usage, a large amount of calcium ions in the ore pulp can reduce the floatability of molybdenite, so that part of molybdenite is lost in tailings, and the enrichment and recovery of molybdenum in copper concentrate are seriously influenced.
Disclosure of Invention
The invention aims to provide a method for recovering molybdenite from copper concentration tailings, which has a good separation effect on the molybdenite in the copper concentration tailings, so that the molybdenite can be fully recovered, and the comprehensive utilization level of mineral resources is improved.
The purpose of the invention is realized by the following technical scheme:
a process for recovering molybdenite from copper concentration tailings, the process comprising:
and 5, adding a pyrite inhibitor BK-YS into the molybdenum rough concentrate obtained in the step 3 for primary concentration operation, regrinding the concentrate after the primary concentration operation until the fineness is-25 um and the grain size accounts for 70% -80%, and then concentrating for 3-6 times to obtain the molybdenum concentrate.
According to the technical scheme provided by the invention, the method has a good separation effect on the molybdenite in the copper concentration tailings, so that the molybdenite can be fully recovered, and the comprehensive utilization level of mineral resources is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a process for recovering molybdenite from copper concentration tailings, according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings 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 of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the following, embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and fig. 1 is a schematic flow chart of a method for recovering molybdenite from copper concentration tailings, according to embodiments of the present invention, the method including:
in the step, the copper concentration tailings to be treated contain 0.06-0.12% of molybdenum, the concentration of ore pulp is 10-20%, the fraction with the fineness of-25 mu m accounts for more than 60%, and the dissociation degree of molybdenite monomer is more than 85%.
The molybdenum minerals in the copper concentration tailings are molybdenite, and the sulfur-containing minerals are mainly pyrite.
in the step, the mass percentage concentration of the water-added and size-mixed slurry is 20-25%, and the mixture is stirred in a stirring barrel for 3-5 minutes at the rotating speed of 1500-2000 r/min.
the added regulator is sodium hexametaphosphate, and the dosage of the regulator is 100-300 g/t;
the added pyrite inhibitor is BK-YS, and the dosage of the added pyrite inhibitor is 100-300 g/t of ore feeding; the BK-YS is a naming code of a novel pyrite inhibitor and comprises 60-80% of sodium thioglycolate and 20-40% of tetraethylenepentamine by mass percent.
The added molybdenite collecting agent is BK-PM, and the amount of the molybdenite collecting agent is 30-50 g/t of ore feeding; the BK-PM is a naming code of a high-efficiency molybdenite collecting agent and comprises 40-60% of kerosene, 30-40% of diesel oil and 10-20% of alkylphenol polyglycol ether by mass percent.
The foaming agent is No. 2 oil, and the dosage of the foaming agent is 10-30 g/t.
here, the usage amount per sweep is:
feeding the pyrite inhibitor BK-YS at 50-100 g/t;
the molybdenite collecting agent BK-PM is 10-20 g/t for ore feeding.
And 5, adding a pyrite inhibitor BK-YS into the molybdenum rough concentrate obtained in the step 3 for primary concentration operation, regrinding the concentrate after the primary concentration operation until the fineness is-25 um and the grain size accounts for 70% -80%, and then concentrating for 3-6 times to obtain the molybdenum concentrate.
In the step, the added pyrite inhibitor BK-YS is fed with the amount of 20-50 g/t. The molybdenum concentrate finally obtained contains 45-55% of molybdenum, and the molybdenum recovery rate is 75-85%.
In addition, after step 5, the scavenger concentrate and concentrate middlings are returned to the previous flotation operation in sequence.
The process flow of the above method is described in detail below by specific examples:
certain copper concentration tailings contain 0.084% of molybdenum, 19.03% of sulfur and 0.086% of copper, and the minerals with the fineness of-25 um account for 62.43%. Wherein most of the metal minerals are pyrite, and a small amount of chalcopyrite, molybdenite, limonite, hematite and the like are also contained. The non-metallic minerals are mainly quartz, muscovite, chlorite, iron dolomite and potash feldspar, and a small amount of biotite, albite, calcite, apatite, rutile, barite, etc. Molybdenite is mainly produced in a monomer form, and a small amount of molybdenite is rich and intergrown with gangue minerals; the embedded particle size of the molybdenite is intensively distributed in 20-74 um.
The process for recovering molybdenite from the copper concentration tailings comprises the following specific steps:
(1) concentration and medicine removal: concentrating copper concentration tailing pulp containing 0.084% of molybdenum, 18% of molybdenum and 62.43% of granularity of-25 mu m by a thickener, a centrifugal machine and the like, wherein the mass concentration of the pulp reaches 70%, and removing water and a flotation agent remained in the pulp;
(2) slurry mixing and stirring: adding water into the concentrated ore pulp for pulp mixing to prepare ore pulp with the mass percentage concentration of 25%, and stirring in a stirring barrel for 3 minutes at the rotation speed of 1750 r/min;
(3) roughing operation: introducing the ore pulp into a roughing flotation unit, sequentially adding 200g/t of regulator sodium hexametaphosphate, BK-YS100g/t of pyrite inhibitor, BK-PM50g/t of molybdenite collector and 17.5g/t of foaming agent No. 2 oil into the roughing flotation unit, stirring for 2 minutes respectively, and performing roughing operation to obtain molybdenum rough concentrate and roughed tailings;
(4) sweeping and selecting: adding BK-YS and BK-PM into the roughed tailings for scavenging for 1 time, wherein BK-YS35g/t ore feeding and BK-PM7g/t ore feeding are scavenged, and the scavenged tailings contain 0.017 percent of molybdenum and have a distribution rate of 20.16 percent of molybdenum;
(5) selection operation: adding BK-YS28g/t into the molybdenum rough concentrate for concentration I, regrinding the concentrate of the concentration I until-25 um accounts for 75%, and then concentrating for 3 times to obtain molybdenum concentrate. The final molybdenum concentrate contains 53.75% of molybdenum and the recovery rate of the molybdenum is 78.96%.
And the scavenging concentrate and the concentrating middling are returned to the previous flotation operation in sequence.
The molybdenite collecting agent BK-PM used is composed of the following components: 55% of kerosene, 35% of diesel oil and 10% of alkylphenol polyglycol ether. The BK-PM is obtained after the components are mixed according to the proportion and stirred for 20 minutes at the temperature of 25 ℃.
The used pyrite inhibitor BK-YS consists of the following components: 75% of sodium thioglycolate and 25% of tetraethylenepentamine. The BK-YS is obtained by mixing the components in proportion and stirring the mixture for 20 minutes at 25 ℃.
It is noted that those skilled in the art will recognize that embodiments of the present invention are not described in detail herein.
In conclusion, the molybdenite collecting agent has good collecting and dispersing effects, good selectivity and stable properties, and can efficiently float and separate molybdenite; the pyrite inhibitor has the characteristics of good fluidity, small dosage, good selectivity, strong inhibition force and the like; meanwhile, copper concentration tailings are concentrated through a thickener, a centrifugal machine and the like, so that water in ore pulp and flotation agents on the surfaces of minerals are removed, the difference of the floatability of the minerals is enlarged, and good conditions are created for subsequent flotation separation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A process for recovering molybdenite from copper concentration tailings, the process comprising:
step 1, concentrating copper concentration tailing pulp to be treated through a thickener and a centrifugal machine to enable the mass concentration of the pulp to reach 65-75%, and removing water and a residual flotation agent in the pulp;
step 2, adding water into the concentrated ore pulp for pulp mixing, and stirring in a stirring barrel;
wherein, the mass concentration of the ore pulp after adding water and mixing is 20% -25%, and the ore pulp is stirred in a stirring barrel for 3-5 minutes at the rotating speed of 1500-2000 r/min;
step 3, introducing the ore pulp treated in the step 2 into a roughing flotation unit, sequentially adding a regulator, a pyrite inhibitor BK-YS, a molybdenite collector BK-PM and a foaming agent, and respectively stirring and roughing to obtain molybdenum rough concentrate and rougher tailings; wherein the added regulator is sodium hexametaphosphate, and the dosage of the regulator is 100-300 g/t; the added pyrite inhibitor is BK-YS which comprises 60-80% of sodium thioglycolate and 20-40% of tetraethylenepentamine by mass, and the pyrite inhibitor BK-YS is fed at the dosage of 100-300 g/t; the molybdenite collecting agent BK-PM comprises 40% -60% of kerosene, 30% -40% of diesel oil and 10% -20% of alkylphenol polyglycol ether by mass, and the molybdenite collecting agent BK-PM is fed with ore with the dosage of 30-50 g/t; the foaming agent is No. 2 oil, and the dosage of the foaming agent is 10-30 g/t of ore feeding;
step 4, adding a pyrite inhibitor BK-YS and a molybdenite collector BK-PM into the rougher tailings obtained in the step 3, and carrying out scavenging for 1-2 times, so that the molybdenum content of the scavenged tailings is less than 0.03%, and the molybdenum distribution rate is less than 25%;
and 5, adding a pyrite inhibitor BK-YS into the molybdenum rough concentrate obtained in the step 3 for primary concentration operation, regrinding the concentrate after the primary concentration operation until the fineness is-25 um and the grain size accounts for 70% -80%, and then concentrating for 3-6 times to obtain the molybdenum concentrate.
2. The process for recovery of molybdenite from copper concentration tailings as claimed in claim 1, wherein in step 4, the amount used per scavenger is:
feeding the pyrite inhibitor BK-YS at 50-100 g/t;
the molybdenite collecting agent BK-PM is 10-20 g/t for ore feeding.
3. The method for recovering molybdenite from copper concentration tailings according to claim 1, wherein the pyrite inhibitor BK-YS is added in an amount of 20-50 g/t to the ore in step 5.
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| CN111515026B (en) * | 2020-05-12 | 2022-07-19 | 江西铜业集团有限公司 | Method for recovering micro-fine particle pyrite from sulfur-containing slime tailings |
| CN114618686B (en) * | 2022-02-16 | 2024-06-18 | 武汉工程大学 | Application of n-butyl thiophosphoric triamide and flotation method of micro-particle molybdenite |
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| CN103878069A (en) * | 2012-12-19 | 2014-06-25 | 沈阳有色金属研究院 | Molybdenite separation method |
| CN104507582A (en) * | 2012-05-10 | 2015-04-08 | 奥图泰(芬兰)公司 | Method and apparatus for separation of molybdenite from pyrite containing copper-molybdenum ores |
| CN106492993A (en) * | 2016-10-30 | 2017-03-15 | 长春黄金研究院 | Suppress the composite restrainer of particulate silicate gangue |
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| WO2018067657A1 (en) * | 2016-10-04 | 2018-04-12 | Cidra Corporate Services, Inc | Separation of copper and molybdenum sulfides from pyrite using a sea water / desalinated water hybrid process |
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Patent Citations (6)
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| CN104507582A (en) * | 2012-05-10 | 2015-04-08 | 奥图泰(芬兰)公司 | Method and apparatus for separation of molybdenite from pyrite containing copper-molybdenum ores |
| CN103878069A (en) * | 2012-12-19 | 2014-06-25 | 沈阳有色金属研究院 | Molybdenite separation method |
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