CN112871439B - Industrial production method for separating fine-grained copper-molybdenum bulk concentrate by using pulsating high-gradient magnetic separation technology - Google Patents
Industrial production method for separating fine-grained copper-molybdenum bulk concentrate by using pulsating high-gradient magnetic separation technology Download PDFInfo
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Abstract
The invention relates to an industrial production method for separating fine-grained copper-molybdenum bulk concentrates by applying a pulsating high-gradient magnetic separation technology, belonging to the technical field of separation of non-ferrous metal ores. The method comprises the steps of firstly pretreating fine-grained copper-molybdenum bulk concentrates through a specific magnetic separation process matched with a flotation production process, then carrying out pulse high-gradient magnetic separation on the fine-grained copper-molybdenum bulk concentrates to obtain low-molybdenum copper concentrates and molybdenum bulk concentrates, carrying out flotation separation on the molybdenum bulk concentrates to obtain copper concentrates and copper-containing molybdenum concentrates, carrying out pulse high-gradient magnetic separation on the copper-containing molybdenum concentrates after flotation separation to obtain qualified molybdenum concentrates, returning the residual middlings to the flotation process, and successfully carrying out industrial production tests on certain porphyry type copper-molybdenum ores in China. The invention succeeds in the test in production, marks that a major breakthrough is made in the technical field of copper and molybdenum separation of porphyry copper ores, takes the lead at home and abroad to apply the strong magnetic separation technology to the copper and molybdenum separation of the porphyry copper ores, and fills the gap of the strong magnetic separation technology in the copper and molybdenum separation production application.
Description
Technical Field
The invention relates to an industrial production method for separating fine copper-molybdenum bulk concentrates by applying a pulsating high-gradient magnetic separation technology, belonging to the technical field of separation of nonferrous metal ores.
Background
Copper and molybdenum are two important nonferrous metals, are important rare and strategic reserve resources in China, and are widely applied to a plurality of fields such as electronics, ships, aerospace and the like due to good physical and chemical properties. China is a large country with copper and molybdenum resources, wherein the molybdenum resource reserves account for about 40% of the world, but single molybdenum ore deposits in China are few, and most of molybdenum exists in porphyry type copper molybdenum (chalcopyrite-molybdenite) ore deposits and is a main source for extracting molybdenum metal in China industry; statistics shows that more than 50% of molybdenum concentrate in China comes from the porphyry type copper-molybdenum ore. However, most porphyry type copper-molybdenum ore deposits in China have low grade, the associated relation of copper and molybdenum is complex, the embedded particle size is very fine, the separation difficulty is very large, and the industrial production and application are difficult.
Chalcopyrite (chemical formula CuFeS) 2 ) And molybdenite (MoS) 2 ) Both are sulfide ores, and the sulfide ores are easy to co-float but difficult to float and separate. Currently, copper-molybdenum ore production enterprises in China adopt a 'copper-molybdenum bulk flotation-flotation separation' process to produce copper concentrates and molybdenum concentrates, namely, chalcopyrite and molybdenite are firstly subjected to bulk flotation to obtain copper-molybdenum bulk concentrates, and then the chalcopyrite and the molybdenite are subjected to flotation separation (copper-suppression molybdenum flotation). However, chalcopyrite and molybdenite have similar floatability, so that a large amount of chemicals such as sodium sulfide and the like are consumed for inhibiting chalcopyrite during flotation separation, and the process is long, so that the separation cost is high, economic benefits are difficult to obtain, and all the chemicals are toxic and have great harm to the environment. At present, the flotation separation of chalcopyrite and molybdenite is adopted, the molybdenum recovery rate of molybdenum concentrate is only about 60% generally, and the molybdenum resource is not developed and utilized effectively and economically. So far, how to separate copper and molybdenum with high efficiency is developed to the maximum extentThe precious molybdenum resource is utilized, and the worldwide problem to be solved urgently at home and abroad still remains.
On the other hand, chalcopyrite is a weakly magnetic mineral and has a specific magnetization coefficient of 0.844X 10 -6 m 3 In terms of kg, molybdenite is a diamagnetic mineral having a specific magnetization of-0.001X 10 -6 m 3 And/kg, wherein the two can be separated by magnetic separation theoretically. In recent years, some works of high-gradient magnetic separation of copper-molybdenum bulk concentrates are developed domestically, and the works are not successful in industry. In fact, at the end of the 20 th century, china has a literature report of applying pulsating high-gradient magnetic separation to copper-molybdenum bulk concentrates, but because the adopted magnetic medium, the magnetic separation process and the technical parameters are not appropriate, the copper-molybdenum separation effect is not ideal, and the molybdenum recovery rate is only about 70%. At present, no industrial test or industrial application case for successful high-gradient magnetic separation of copper-molybdenum bulk concentrates exists at home and abroad.
The patent application number is 2020101538498, which is named as a process for directly separating chalcopyrite and molybdenite by superconducting magnetic separation, and the process comprises the steps of firstly performing superconducting weak magnetic separation on mixed concentrate of the chalcopyrite and the molybdenite by using a superconducting magnetic separator under the condition of the intensity of a weak magnetic field, removing strong magnetic minerals, and then performing superconducting strong magnetic separation on the mixed concentrate by using the superconducting magnetic separator under the condition of the intensity of a strong magnetic field, so that the direct separation of the chalcopyrite and the molybdenite is realized. However, this method is not industrially applicable.
The patent application number is 2019107366577, which is named as a new grading preselection-stirring mill-flotation process for improving the quality of copper concentrate, and the process 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 patent application number is 2019107366543, which is named as a pretreatment-magnetic-floating combined mineral separation process for separating molybdenum-containing copper concentrate, and discloses that the process takes the molybdenum-containing copper concentrate obtained by flotation as a raw material, and comprises the following steps: carrying out grading pretreatment on the molybdenum-containing copper concentrate by adopting a two-stage series cyclone to obtain overflow and mixed settled sand; adding water into the mixed settled sand for size mixing, and then carrying out copper-molybdenum magnetic separation to obtain magnetic concentrate and magnetic tailings; and concentrating, dehydrating and mixing the magnetic separation tailings, and performing copper-molybdenum flotation separation to obtain molybdenum concentrate and copper concentrate.
The processes all involve magnetic separation and other treatment processes for separating molybdenum-copper bulk concentrates, but the processes are not industrially applied.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides an industrial production method for separating fine-grained copper-molybdenum bulk concentrates by applying a pulsating high-gradient magnetic separation technology. The invention adopts the specific magnetic separation process matched with the flotation production process and adopts the pretreatment-pulsating high-gradient magnetic separation-roughing-concentrating-flotation-pulsating high-gradient magnetic separation processes, and the industrial production test of certain porphyry type copper-molybdenum ore in China is successful. The invention is realized by the following technical scheme.
An industrial production method for separating fine-grained copper-molybdenum bulk concentrate by applying a pulsating high-gradient magnetic separation technology comprises the following specific steps:
the method adopts the procedures of pretreatment, pulsating high-gradient magnetic separation, rough treatment, fine treatment, flotation and pulsating high-gradient magnetic separation, and specifically comprises the following steps:
(1) Pretreating, namely firstly adjusting the concentration of ore pulp of the fine-grain copper-molybdenum bulk concentrate to 10-30wt%, adding a pH regulator to adjust the pH value of the ore pulp to be alkaline, and stirring for 3-5min;
(2) Performing pulsed high-gradient magnetic separation for rough concentration and fine concentration, and performing pulsed high-gradient magnetic separation for rough concentration and fine concentration on the fine-grain copper-molybdenum mixed concentrate pretreated in the step (1) to obtain low-molybdenum copper concentrate and molybdenum rough concentrate, wherein a combined magnetic medium with the magnetic induction intensity of 1.0-2.0 is adopted in the pulsed high-gradient magnetic separation for rough concentration and fine concentration, the magnetic induction intensity is 1.7-1.8T, the pulse frequency is 100-350r/min, and the pulse stroke is 5-30mm;
(3) Performing flotation, namely performing flotation on the molybdenum rough concentrate obtained in the step (2) to obtain copper concentrate and copper-containing molybdenum concentrate;
(4) Performing pulsed high-gradient magnetic separation, namely performing pulsed high-gradient magnetic separation on the copper-containing molybdenum concentrate obtained in the step (3) to obtain qualified molybdenum concentrate and middling, and returning the middling to the flotation process in the step (3); wherein the pulsating high gradient magnetic separation adopts a combined rod medium of 1.0 to 2.0, the magnetic induction intensity is 1.7 to 1.8T, the pulsating stroke frequency is 100 to 350r/min, and the pulsating stroke is 5 to 30mm.
The copper grade in the fine-grain copper-molybdenum bulk concentrate in the step (1) is 10 to 30wt%, and the molybdenum grade is 0.15 to 1.50wt%.
The flotation process in the step (3) adopts the current conventional flotation production process and reagent system, and the consumption of the flotation reagent is reduced by 20 to 40 percent compared with the conventional flotation separation process.
The pulsating high-gradient magnetic separation in the step (2) needs to control the configuration of medium wires and the arrangement and combination of medium wires; the configuration of the medium silk in the step (2) is determined by patents ZL201610574053.3 and ZL201610061835.7, and a medium multi-silk arrangement combination model is determined by patents: ZL 201210074235.6.
The invention has the beneficial effects that:
(1) The method comprises the steps of firstly pretreating fine-grained copper-molybdenum bulk concentrates through a specific magnetic separation process matched with a flotation production process, then carrying out pulse high-gradient magnetic separation on the fine-grained copper-molybdenum bulk concentrates to obtain low-molybdenum copper concentrates and molybdenum bulk concentrates, then carrying out flotation separation on the molybdenum bulk concentrates to obtain copper concentrates and copper-containing molybdenum concentrates, carrying out pulse high-gradient magnetic separation on the copper-containing molybdenum concentrates after flotation separation to obtain qualified molybdenum concentrates, returning the residual middlings to the flotation process, and successfully carrying out industrial production tests on certain porphyry copper-molybdenum ores in China.
(2) The fine-grain copper-molybdenum bulk concentrate is subjected to pulsating high-gradient magnetic separation for rough concentration and fine concentration, the yield of the obtained low-molybdenum copper concentrate is 20 to 40 percent, the molybdenum content is reduced to be below 0.10 percent, the copper grade is improved by 5 to 7 percent, and the copper recovery rate is 40 to 55 percent; the enrichment of the molybdenum content of the magnetic separation tailings (molybdenum rough concentrate) is improved by 30 to 50 percent, the copper grade is reduced by 3 to 5 percent, and the molybdenum recovery rate is as high as 90 to 95 percent.
(3) In the flotation separation process of the molybdenum concentrate, the low-molybdenum copper concentrate with the yield of 20-40% is extracted by pulsating high-gradient magnetic separation, rough concentration and fine concentration, the dosage of the flotation agent is reduced by 20-40% in the flotation process, and the overall production cost of copper-molybdenum separation is reduced by more than 30% in the technology of the invention.
(4) The invention succeeds in production test, which marks that a major breakthrough is made in the technical field of copper-molybdenum separation of porphyry copper ores, and the magnetic separation technology is applied to the copper-molybdenum separation of the porphyry copper ores at home and abroad, so that the blank of the magnetic separation technology in the copper-molybdenum separation production application is filled.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
The copper grade of some porphyry type copper-molybdenum ore in Yunnan is about 0.50 percent, the molybdenum grade is about 0.008 percent, copper mainly exists in the form of chalcopyrite, and molybdenum exists in the form of molybdenite. Carrying out bulk flotation on porphyry copper-molybdenum ores in Yunnan to obtain fine-grained copper-molybdenum bulk concentrates.
The industrial production method for separating the fine-grained copper-molybdenum bulk concentrate by applying the pulsating high-gradient magnetic separation technology comprises the following specific steps:
the method adopts a pretreatment-pulsating high-gradient magnetic separation-rough-fine separation-flotation-pulsating high-gradient magnetic separation process, and specifically comprises the following steps:
(1) Pretreating, namely firstly, adjusting the concentration of ore pulp to be 20-25wt% by using fine-grain copper-molybdenum bulk concentrates (the granularity is-325 meshes and accounts for 90-92%), adding a pH regulator (such as lime) to adjust the pH value of the ore pulp to be alkaline (9.5-10.0), and stirring for 3-5min;
(2) Performing pulsed high-gradient magnetic separation on the fine-grain copper-molybdenum bulk concentrate pretreated in the step (1), and performing pulsed high-gradient magnetic separation on the fine-grain copper-molybdenum bulk concentrate to obtain low-molybdenum copper concentrate and molybdenum bulk concentrate, wherein a 1.5mm combined magnetic medium (the configuration of a medium wire is cylindrical, and a medium multi-wire arrangement combined model is a cross matrix arrangement which takes 1.5mm as a main medium) is adopted in the pulsed high-gradient magnetic separation first coarse-first fine separation, the magnetic induction intensity is 1.8T, the pulse frequency is 150r/min, the pulse stroke is 12mm, and the pulp flow velocity is about 5.0cm/s;
(3) Performing flotation, namely performing conventional flotation (such as taking sodium sulfide as copper inhibitor and kerosene as a collecting agent) on the molybdenum rough concentrate obtained in the step (2) to separate the molybdenum rough concentrate into copper concentrate and copper-containing molybdenum concentrate;
(4) Performing pulsed high-gradient magnetic separation, namely performing pulsed high-gradient magnetic separation on the copper-containing molybdenum concentrate obtained in the step (3) to obtain qualified molybdenum concentrate and middling, and returning the middling to the flotation process in the step (3); wherein the pulsed high-gradient magnetic separation adopts a 1.5mm combined cylindrical rod medium, the magnetic induction intensity is 1.8T, the pulsed frequency of impact is 150r/min, and the pulsed stroke is 12mm.
The index results obtained by the present production method are shown in table 1 below.
TABLE 1
Description of the drawings: the pulsating high-gradient magnetic separation is an open-circuit test result, and the copper concentrate is returned to the flotation separation operation for recleaning in practice.
In the prior art, the porphyry type copper-molybdenum ore is used for producing copper concentrate and molybdenum concentrate by adopting a 'copper-molybdenum mixed flotation-flotation separation' process, and the production indexes are shown in the following table 2.
TABLE 2 production indexes (production report) of the conventional "copper and molybdenum mixed flotation-flotation separation" process
It is seen from the comparison between tables 1 and 2 that the present invention can obtain copper concentrate with low molybdenum content and qualified molybdenum concentrate product with copper content lower than 1.0%, and the molybdenum recovery rate of the molybdenum concentrate is higher than that of the traditional production process. The production process of the invention reduces the medicament consumption of the separation flotation operation by about 37 percent, and reduces the overall production cost of copper-molybdenum separation by 43 percent. The invention has succeeded in domestic industrial production test of certain porphyry type copper-molybdenum ore.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (2)
1. An industrial production method for separating fine-grained copper-molybdenum bulk concentrate by applying a pulsating high-gradient magnetic separation technology is characterized by comprising the following specific steps of:
the method adopts the procedures of pretreatment, pulsating high-gradient magnetic separation, rough treatment, fine treatment, flotation and pulsating high-gradient magnetic separation, and specifically comprises the following steps:
(1) Pretreating, namely firstly adjusting the concentration of ore pulp of the fine-grain copper-molybdenum bulk concentrate to 10-30wt%, adding a lime pH regulator to adjust the pH value of the ore pulp to be alkaline, namely 9.5-10.0, and stirring for 3-5 min;
(2) Performing pulsed high-gradient magnetic separation for rough concentration and fine concentration, and performing pulsed high-gradient magnetic separation for rough concentration and fine concentration on the fine-grain copper-molybdenum mixed concentrate pretreated in the step (1) to obtain low-molybdenum copper concentrate and molybdenum rough concentrate, wherein a combined rod medium with the thickness of 1.0-2.0 mm is adopted in the pulsed high-gradient magnetic separation for rough concentration and fine concentration, the magnetic induction intensity is 1.7-1.8T, the pulse frequency is 100-350r/min, and the pulse stroke is 5-30mm;
(3) Performing flotation, namely performing flotation on the molybdenum rough concentrate obtained in the step (2) to obtain copper concentrate and copper-containing molybdenum concentrate;
(4) Performing pulsed high-gradient magnetic separation, namely performing pulsed high-gradient magnetic separation on the copper-containing molybdenum concentrate obtained in the step (3) to obtain qualified molybdenum concentrate and middling, and returning the middling to the flotation process in the step (3); wherein the pulsed high-gradient magnetic separation adopts a 1.0 to 2.0 combined rod medium, the magnetic induction intensity is 1.7 to 1.8T, the pulsed stroke is 100 to 350r/min, and the pulsed stroke is 5 to 30mm;
carrying out mixed flotation on chalcopyrite and molybdenite to obtain copper-molybdenum bulk concentrate;
the pulsating high-gradient magnetic separation in the step (2) needs to control the configuration of the medium wires and the arrangement and combination of the medium wires.
2. The industrial production method for separating fine-grained copper molybdenum bulk concentrate using pulsating high gradient magnetic separation technique according to claim 1, characterized in that: in the step (1), the copper grade in the fine-grain copper-molybdenum bulk concentrate ranges from 10 to 30wt%, and the molybdenum grade ranges from 0.15 to 1.50wt%.
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| US20080067112A1 (en) * | 2006-09-20 | 2008-03-20 | Kuhn Martin C | Methods for the recovery of molybdenum |
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| CN105413854B (en) * | 2015-12-23 | 2018-02-13 | 中国地质科学院矿产综合利用研究所 | Beneficiation method for high-oxidation-rate copper-molybdenum paragenic ore |
| CN105701309B (en) * | 2016-01-29 | 2018-11-27 | 昆明理工大学 | A kind of method of analysis detection magnetic medium magnetic force capture magnetic-particle feature |
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