CN111871595A - Pre-selection method of molybdenum-containing copper concentrate - Google Patents
Pre-selection method of molybdenum-containing copper concentrate Download PDFInfo
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- CN111871595A CN111871595A CN202010658458.1A CN202010658458A CN111871595A CN 111871595 A CN111871595 A CN 111871595A CN 202010658458 A CN202010658458 A CN 202010658458A CN 111871595 A CN111871595 A CN 111871595A
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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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
Abstract
The invention belongs to the field of non-ferrous metal beneficiation, and particularly relates to a pre-selection method of molybdenum-containing copper concentrate. The method comprises the following steps: inputting the copper-molybdenum mixed concentrate pulp containing molybdenite into an overflow discharge type magnetic hydrocyclone for 1 or 2 times of preselection, producing molybdenum-poor overflow pulp and molybdenum-rich settled sand after preselection, transferring the molybdenum-poor overflow pulp into a concentration tank for gravity separation, combining the molybdenum-rich settled sand after preselection, mixing the settled sand after combination, and performing copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%. The method combines the discovery of the magnetic difference between the chalcopyrite and the molybdenite, adopts the overflow discharge type magnetic hydraulic cyclone for preselection, improves the grade of molybdenum in the sand setting, achieves the effect of preseparating molybdenum enrichment, and creates favorable conditions for efficiently recovering the molybdenite. Therefore, the method has the remarkable advantages of strong adaptability, high efficiency, low cost of copper-molybdenum separation and high molybdenum recovery rate.
Description
Technical Field
The invention belongs to the field of non-ferrous metal ore dressing, and particularly relates to a pre-selection method of molybdenum-containing copper concentrate before copper-molybdenum flotation separation of the molybdenum-containing copper concentrate.
Background
Molybdenum is a rare and precious high-melting-point metal, is an important alloying element for producing alloy steel, stainless steel, heat-resistant steel, alloy cast iron and other products, and is also an important strategic substance.
The molybdenum resource in China is very abundant, the reserve accounts for about 25% of the total reserve of molybdenum in the world, is second only in the United states and is second in the world, the molybdenum resource in China mainly takes primary molybdenite, most of the molybdenum resource exists in sulfide minerals in the form of symbiotic or associated molybdenum, a single molybdenum ore deposit is few, the ore deposit mainly taking copper and associated with molybdenum usually exists in the form of porphyry copper ore deposit, and the molybdenum resource is an important source of the current copper-molybdenum metal.
Because copper and molybdenum minerals in porphyry copper ores are densely symbiotic, the structure is complex, the embedded granularity is uneven, and the floatability of copper and molybdenum is similar, the molybdenum-containing copper concentrate produced by the grinding and floating process has the following characteristics: namely fine granularity, large copper-molybdenum ratio, high alkalinity, residual beneficiation reagent, large pulp viscosity and the like, so the copper-molybdenum separation difficulty is high and the separation cost is high. Aiming at the separation of copper and molybdenum, from the last 70 years to the present, the technical field successively carries out medicament research and process research on copper-containing copper concentrate for inhibiting copper and floating molybdenum.
The research and application of the copper-molybdenum separation medicament are as follows: sodium sulfide and sodium hydrosulfide used in the Dexing copper mine are copper-inhibiting agents widely used for separating copper from molybdenum at present, sodium thioglycolate proposed by the soldier can be used as a copper-molybdenum-floating inhibiting agent, sodium cyanide, Nox and the like proposed by Zhuyushuang and the like are also copper-inhibiting agents, an oxidant + inhibitor combination method proposed by Gushijun, Yangboeng and the like has an obvious effect on inhibiting copper and molybdenum-floating, and common oxidants include hydrogen peroxide, sodium hypochlorite, potassium permanganate, sodium dichromate and the like. The research and the use of the agents have obvious effects under specific conditions, but the problems of large dosage, low molybdenum recovery rate and high copper-molybdenum separation cost generally exist by taking the whole material of the molybdenum-containing copper concentrate as a research object.
The research and application of the copper-molybdenum separation process are as follows: nitrogen charging method proposed by Huangjie and Zhang army, pulsating high gradient magnetic separation method researched by Yangpeng et al, warming method used in the former Soviet Union and including Zhang Baoyuan, flotation column separation method researched by Zhou Xurihig day, Zhuyufeng and the like, acidification pH regulation method researched by Dexing copper mine and the like. The research and the use of the processes have obvious effects under specific conditions, but the problems of complex process, low molybdenum recovery rate and high copper-molybdenum separation cost generally exist by taking the whole material of the molybdenum-containing copper concentrate as a research object.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preselection method of molybdenum-containing copper concentrate, which has the advantages of wide application range, low copper-molybdenum separation cost and high molybdenum recovery rate.
The technical scheme of the invention is as follows: a method for the pre-selection of a molybdenum-bearing copper concentrate, the method comprising the steps of:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out preselection, and producing molybdenum-poor overflow slurry and molybdenum-rich settled sand after preselection;
s2) pre-selecting the molybdenum-rich settled sand obtained in the step S1), pulping, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
The invention also aims to provide a preselection method of the molybdenum-containing copper concentrate, which specifically comprises the following steps:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out first preselection, and then generating molybdenum-poor overflow slurry and molybdenum-rich settled sand;
s2) transferring the molybdenum-poor overflow ore pulp subjected to the pre-selection in the S1) into a concentration tank for gravity separation, inputting the separated underflow into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, performing the second pre-selection, and performing the second molybdenum-rich sand setting;
s3) mixing the molybdenum-rich settled sands obtained after the pre-selection of S1) and S2), mixing the combined settled sands, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
Further, before the molybdenum-containing copper concentrate is formed, molybdenum exists in the form of associated metal ore, sulfide ore is taken as main material, molybdenum-containing copper concentrate pulp is produced through a grinding and floating process, and molybdenum-containing minerals are taken as main material of molybdenite.
Further, the content of the +38 μm fraction in the copper-molybdenum mixed concentrate slurry containing molybdenite in S1) is not more than 60%.
Furthermore, the overflow discharge type magnetic hydrocyclone is of a long cone medium and small size specification with the specification of phi 75-200 and the cone angle of 7-10 degrees, an inward radial magnetic field is formed by a magnetic structure and magnetic field distribution, and the magnetic field intensity is as follows: 0.35-1.0T.
Further, the specific process in S1) is as follows: the working pressure is 0.19-0.21 MPa, and the preselected concentration is 16-23%.
Further, the specific process in S2) is as follows: the working pressure is 0.20-0.22 MPa, and the preselected concentration is 16-23%.
Further, the magnetic field intensity of the first preselection is 1.0-1.2 times of the magnetic field intensity of the second preselection.
Further, the comprehensive recovery rate of molybdenum selection by the preselection method is not less than 75%, and the unit consumption amplitude of sodium sulfide is not less than 52%.
The invention has the advantages that: compared with the conventional copper-molybdenum separation technology, the invention advances the gateway of the traditional copper-molybdenum flotation separation technology, utilizes the magnetic difference between chalcopyrite and molybdenite, and is realized based on the integration of magnetic force and rotational flow composite force, thereby inventing a preselection method of molybdenum-containing copper concentrate, and achieving the following effects: the method comprises the following steps of pre-sorting the molybdenum-copper-containing concentrate complete material through a magnetic hydrocyclone, separating most of refractory fine-fraction ores, low-molybdenum-content chalcopyrite and a small amount of pyrite, taking a molybdenum-rich sand setting material, and finally realizing the high-efficiency recovery of molybdenum through a flotation process. The method better solves the adverse effect of the problems of fine granularity, large viscosity, more residual medicament, serious pollution of mineral interfaces and the like of the copper concentrate containing molybdenum on the flotation separation of copper and molybdenum, and simultaneously, the method is found by combining the magnetic differentiation of the chalcopyrite and the molybdenite, adopts the overflow discharge type magnetic hydraulic cyclone for preselection, improves the grade of molybdenum in the settled sand, has smooth operation process (the problem that the magnetic medium is easy to block when being contacted with ore pulp like the conventional magnetic separation equipment does not exist), achieves the effect of pre-separating molybdenum enrichment, and realizes the purposes of efficiently removing 'mud', removing medicament and efficiently recovering the molybdenite. Therefore, the method has the remarkable advantages of strong adaptability, high efficiency, low cost of copper-molybdenum separation and high molybdenum recovery rate.
Drawings
Fig. 1 is a process flow diagram of a preselection process of a molybdenum-containing copper concentrate of the present invention.
Fig. 2 is a process flow diagram of two preselections of a method of preselecting a molybdenum-containing copper concentrate of the present invention.
Detailed Description
The invention is further illustrated by, but is not limited to, the following examples. All percentages in the examples are by mass unless otherwise specified.
As shown in fig. 1, the method for pre-selecting a molybdenum-containing copper concentrate of the present invention specifically comprises the following steps:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out preselection, and producing molybdenum-poor overflow slurry and molybdenum-rich settled sand after preselection;
s2) pre-selecting the molybdenum-rich settled sand obtained in the step S1), pulping, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
As shown in fig. 2, the method for pre-selecting a molybdenum-containing copper concentrate of the present invention specifically comprises the steps of:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out first preselection, and then generating molybdenum-poor overflow slurry and molybdenum-rich settled sand;
s2) transferring the molybdenum-poor overflow ore pulp subjected to the pre-selection in the S1) into a concentration tank for gravity separation, inputting the separated underflow into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, performing the second pre-selection, and performing the second molybdenum-rich sand setting;
s3) mixing the molybdenum-rich settled sands obtained after the pre-selection of S1) and S2), mixing the combined settled sands, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
Before the molybdenum-containing copper concentrate is formed, molybdenum exists in the form of associated metal ore, sulfide ore is taken as the main material, molybdenum-containing copper concentrate pulp is produced through a grinding and floating process, and molybdenum-containing minerals are taken as the main material of molybdenite.
The content of the plus 38 mu m fraction in the copper-molybdenum mixed concentrate pulp containing molybdenite in the S1) is not more than 60 percent.
The overflow discharge type magnetic hydrocyclone is of a long cone medium and small size specification with the specification of phi 75-200 and the cone angle of 7-10 degrees, an inward radial magnetic field is formed by a magnetic structure and magnetic field distribution, and the magnetic field intensity is as follows: 0.35-1.0T.
The specific process in S1) comprises the following steps: the working pressure is 0.19-0.21 MPa, and the preselected concentration is 16-23%.
The specific process in S2) comprises the following steps: the working pressure is 0.20-0.22 MPa, and the preselected concentration is 16-23%.
The first preselected magnetic field strength is 1.0-1.2 times the second preselected magnetic field strength.
The comprehensive recovery rate of molybdenum selection of the preselection method is not less than 75 percent, and the unit consumption amplitude of sodium sulfide is not less than 52 percent.
Example 1
A method of preselecting a molybdenum-bearing copper concentrate of the invention as shown in fig. 1, comprising the steps of:
the molybdenum-copper-containing concentrate produced by the copper selecting process has 24.2 percent of copper-containing grade, 0.48 percent of molybdenum-containing grade, 12.4 percent of grain size fraction of-10 mu m and 23 percent of material concentration. The molybdenum-copper-containing concentrate ore material is input into a long cone magnetic hydrocyclone with the specification of phi 100 and the cone angle of 8 degrees for pre-selection, the magnetic field intensity is 0.5T, the working pressure is 0.18 MPa-0.20 MPa, and the pre-selection concentration is 22%. The content of the grit fraction of-10 mu m generated by preselection is less than 6 percent, and the treated product is subjected to size mixing and then enters a copper-molybdenum flotation separation test to obtain molybdenum concentrate with the molybdenum content of not less than 45 percent. The test data are shown in Table 1.
Table 1: pre-selection of pre-and post-index comparisons
As can be seen from Table 1, the recovery rate of the non-preselected molybdenum concentrate is 67.85%, the grade of the molybdenum concentrate is 40.25%, and the unit consumption of sodium sulfide is 48 kg/t; after the magnetic cyclone preselection technology is adopted, the grade of the sand setting molybdenum is improved by 0.04 percent compared with the raw ore before preselection, the improvement range reaches 8.33 percent, the obvious enrichment is realized, the comprehensive recovery rate of the molybdenum selection is 75.28 percent, the improvement is 7.43 percent, the grade of the molybdenum concentrate is 45.6 percent, the unit consumption of sodium sulfide is 23kg/t, the unit consumption is reduced by 25kg/t, the reduction range reaches 52 percent, and the economic and environmental benefits are very obvious.
Example 2
A method of preselecting a molybdenum-bearing copper concentrate of the invention as shown in fig. 2, comprising the steps of:
the molybdenum-copper-containing concentrate produced by the copper selecting process has 24.4 percent of copper-containing grade, 0.55 percent of molybdenum-containing grade, 26.1 percent of grain size fraction of 10 mu m and 22 percent of material concentration. Inputting the molybdenum-copper-containing concentrate ore material into a long cone magnetic hydrocyclone with the specification of phi 100 and the cone angle of 8 degrees for 1-time preselection, wherein the magnetic field intensity is 0.5T, the working pressure is 0.19 MPa-0.21 MPa, and the preselection concentration is 21 percent; transferring the overflow ore pulp subjected to 1-time preselection into a concentration tank for gravity separation, inputting the separated underflow into a long cone magnetic hydrocyclone with the specification of phi 75 and the cone angle of 8 degrees for 2-time preselection, wherein the magnetic field intensity is 0.6T, the working pressure is 0.20 MPa-0.22 MPa, and the preselection concentration is 18%; and (3) merging the settled sands after 1 and 2 times of preselection, mixing ore pulp, wherein the-10 mu m size fraction content of the ore pulp is less than 12%, and performing size mixing and then performing a copper-molybdenum flotation separation test to obtain molybdenum concentrate with the molybdenum content of not less than 45%. The test is carried out on the non-magnetic hydrocyclone simultaneously, and the test data are shown in the table 2.
Table 2: magnetic force and non-magnetic force rotational flow pre-selection front and rear index comparison
As can be seen from Table 2, by adopting the non-magnetic hydrocyclone preselection scheme, the grade of the settled sand Mo is 0.541 percent (0.009 percent lower than the grade of the raw ore Mo), the recovery rate of the settled sand Mo is 88.92 percent, and the comprehensive recovery rate of the molybdenum dressing is 75.76 percent; after the magnetic hydrocyclone preselection technology is adopted, the grade of the settled sand Mo is 0.592 percent (0.042 percent higher than that of the raw ore Mo), the recovery rate of the settled sand Mo is 96.89 percent, the comprehensive recovery rate of the molybdenum separation is 83.07 percent, compared with the scheme with the serial number 1, the recovery rates are respectively improved by 0.051 percent, 7.97 percent and 7.31 percent, the unit consumption of sodium sulfide is 23.2kg/t, the unit consumption is reduced by 0.9kg/t, and the economic and environmental benefits have obvious advantages.
The comprehensive recovery rate of molybdenum separation is 75.28%, the molybdenum concentrate grade is improved by 7.43%, the unit consumption of sodium sulfide is 23kg/t, the unit consumption is reduced by 25kg/t, the reduction range is 52%,
the above examples are only intended to illustrate the technical solution of the present invention and are not intended to be limiting. It should be noted that those skilled in the art can make appropriate modifications and substitutions without departing from the technical principle of the present invention, and such modifications and substitutions should also be regarded as the scope of the present invention.
Claims (9)
1. A method for the preselection of a molybdenum-bearing copper concentrate, characterized in that the method comprises the following steps:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out preselection, and producing molybdenum-poor overflow slurry and molybdenum-rich settled sand after preselection;
s2) pre-selecting the molybdenum-rich settled sand obtained in the step S1), pulping, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
2. A method for the preselection of a molybdenum-bearing copper concentrate, characterized in that the method comprises the following steps:
s1) inputting the copper-molybdenum mixed concentrate slurry containing molybdenite into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, carrying out first preselection, and then generating molybdenum-poor overflow slurry and molybdenum-rich settled sand;
s2) transferring the molybdenum-poor overflow ore pulp subjected to the pre-selection in the S1) into a concentration tank for gravity separation, inputting the separated underflow into an overflow discharge type magnetic hydrocyclone, adjusting the magnetic field intensity, performing the second pre-selection, and performing the second molybdenum-rich sand setting;
s3) mixing the molybdenum-rich settled sands obtained after the pre-selection of S1) and S2), mixing the combined settled sands, and carrying out copper-molybdenum separation through a flotation process to obtain molybdenum concentrate with the molybdenum content of not less than 45%.
3. A pre-selection method according to claim 1 or 2, characterised in that: before the molybdenum-containing copper concentrate is formed, sulfide ore is taken as the main component, molybdenum exists in the form of associated metal ore, and molybdenum minerals in ore pulp are taken as molybdenite after molybdenum-containing copper concentrate ore pulp is produced through a grinding and floating process.
4. A pre-selection process according to claim 1 or 2, characterised in that the +38 μm fraction content of the copper-molybdenum mixed concentrate slurry containing molybdenite in S1) does not exceed 60%.
5. A preselection method as claimed in claim 1 or 2, characterized in that the overflow discharge type magnetic hydrocyclone is of a long cone medium and small size specification of phi 75-200 and cone angle of 7-10 °, the magnetic structure and magnetic field distribution are to form an inward radial magnetic field with magnetic field strength: 0.35-1.0T.
6. The preselection method as claimed in claim 1 or 2, wherein the specific process in S1) is: the working pressure is 0.19-0.21 MPa, and the preselected concentration is 16-23%.
7. The preselection method as claimed in claim 2, wherein the specific process in S2) is: the working pressure is 0.20-0.22 MPa, and the preselected concentration is 16-23%.
8. A pre-selection method as claimed in claim 5, wherein the first pre-selected magnetic field strength is 1.0 to 1.2 times the second pre-selected magnetic field strength.
9. A pre-selection process as claimed in any one of claims 1 to 8, wherein the pre-selection process has a combined molybdenum recovery of not less than 75% and a unit consumption of sodium sulfide of not less than 52%.
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|---|---|---|---|---|
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| CN110216008A (en) * | 2019-07-04 | 2019-09-10 | 长春黄金研究院有限公司 | A kind of microfine molybdenite copper-cobalt ore method for floating |
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- 2020-07-09 CN CN202010658458.1A patent/CN111871595A/en active Pending
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| CN103056049A (en) * | 2013-01-23 | 2013-04-24 | 武汉科技大学 | Overflow-discharge-type magnetic hydrocyclone |
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| CN109201354A (en) * | 2018-11-06 | 2019-01-15 | 中南大学 | MAGNETIC HYDROCYCLONES, magnetic reconnection conjunction separation system and the magnetic reconnection selected for weak magnetic mineral closes the method sorted |
| CN110216008A (en) * | 2019-07-04 | 2019-09-10 | 长春黄金研究院有限公司 | A kind of microfine molybdenite copper-cobalt ore method for floating |
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