CN108580056B - Mineral separation process for three-product molybdenum ore - Google Patents

Mineral separation process for three-product molybdenum ore Download PDF

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CN108580056B
CN108580056B CN201810863994.8A CN201810863994A CN108580056B CN 108580056 B CN108580056 B CN 108580056B CN 201810863994 A CN201810863994 A CN 201810863994A CN 108580056 B CN108580056 B CN 108580056B
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flotation
copper
fine
molybdenum
sulfur
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CN108580056A (en
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李国洲
杨海龙
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Northern Engineering and Technology Corp MCC
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Northern Engineering and Technology Corp MCC
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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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/018—Mixtures of inorganic and organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/02—Collectors
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/04—Frothers
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/06—Depressants
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores

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  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a mineral separation process of three-product molybdenum ore, which comprises the following steps: raw ores with the granularity of 0-12mm, the molybdenum grade of 0.1%, the copper grade of 0.015% and the sulfur grade of 0.4% are fed into a first-stage closed circuit ore grinding grading operation, and the overflow of a first-stage ore grinding cyclone is subjected to molybdenum and copper mixed flotation operation, molybdenum and copper separation flotation operation and sulfur flotation operation to respectively select final molybdenum concentrate with the molybdenum grade of 54%, the molybdenum recovery rate of 85%, the copper grade of 0.09% and the yield of 0.156%; the grade is 18.2%, the copper recovery rate is 42%, the yield is 0.038% of the final copper concentrate, the sulfur grade is 46%, the sulfur recovery rate is 63%, the yield is 0.55% of the final sulfur concentrate, the tailings of the sulfur roughing and the copper secondary scavenging form the final tailings, the tailings yield is 99.26%, the copper recovery rate is 55%, the molybdenum recovery rate is 14%, and the sulfur recovery rate is 34%. Three concentrate products are obtained in one process.

Description

Mineral separation process for three-product molybdenum ore
Technical Field
The invention belongs to the technical field of molybdenum ore beneficiation, and particularly relates to a beneficiation process for molybdenum ore, a three-product molybdenum ore.
Background
Currently some molybdenum ores are mostly associated with copper and sulfur. Such as molybdenum ore from Yichun deer in Heilongjiang, molybdenum ore from Heng Lu Hua in inner Mongolia. The molybdenum minerals are molybdenite, the copper minerals are mainly chalcopyrite, and secondly chalcocite, bornite, copper blue and the like; other metal sulfide minerals are mainly pyrite, and secondly sphalerite, pyrrhotite, galena and the like.
The molybdenum content in the raw molybdenum ore is mostly about 0.1%, the copper content is about 0.015%, and the sulfur content is about 0.4%. The useful mineral is mainly molybdenite (M)OS2) Chalcopyrite (CuFeS)2) And chalcocite (Cu)2S). Most of these ores recover molybdenum only, while copper and sulfur are tailings thrown. Copper minerals, like molybdenite, are sulfide minerals and are easy to mix in molybdenum concentrate during molybdenum ore flotation, and the copper grade in the molybdenum concentrate is easy to exceed the specification of the copper content in the molybdenum concentrate quality standard of 0.15%, so that the product quality and the selling price of the molybdenum concentrate are influenced. And most of sulfur enters tailings in the form of other sulfides except for entering corresponding concentrates as the chemical compositions of molybdenum minerals and copper minerals. In order to improve the healds of the mineralIn order to meet the utilization rate and the economic benefit of the whole mine, molybdenum, copper and sulfur need to be comprehensively recovered, high-quality molybdenum concentrate is produced, and copper concentrate and sulfur concentrate with relatively high product grade are produced. Therefore, it is necessary to develop a three-product molybdenum ore dressing process which can effectively recover molybdenum, copper and sulfur in molybdenum ore, ensure the quality of molybdenum concentrate and improve the economic benefit of mine.
Disclosure of Invention
The invention aims to provide a three-product molybdenum ore dressing process which can effectively recover molybdenum, copper and sulfur in molybdenum ore, can ensure the quality of molybdenum concentrate and improve the economic benefit of a mine.
The purpose of the invention is realized by the following technical scheme:
according to the ore dressing process of the three-product molybdenum ore, the molybdenum grade in the raw ore is 0.1%, the copper grade is 0.015%, the sulfur grade is 0.4%, and the molybdenum mineral in the raw ore is mainly molybdenite (M)OS2) The copper mineral comprises chalcopyrite (CuFeS)2) And chalcocite (Cu)2S), characterized by comprising the following steps:
1) raw ore with the granularity of 0-12mm, the molybdenum grade of 0.1%, the copper grade of 0.015% and the sulfur grade of 0.4% is fed into a first-stage closed-circuit ore grinding grading operation consisting of a first-stage ball mill and a cyclone, and the overflow of the first-stage ore grinding cyclone with the granularity of-0.076 mm accounting for 60% is fed into a molybdenum and copper mixed flotation operation;
2) the molybdenum and copper mixed flotation operation is direct flotation, a flotation flow structure of first quick flotation, first rough flotation, first fine flotation and second sweeping is adopted, the first quick flotation is quick flotation, the first rough flotation is rough flotation, the first fine flotation is rough flotation, the second sweeping is continuous twice sweeping flotation, underflow tailings of the quick flotation are fed into the rough flotation, froth concentrate of the rough flotation is fed into first fine flotation, underflow tailings of the rough flotation are fed into first sweeping flotation, underflow tailings of the first sweeping flotation are fed into second sweeping flotation, and underflow tailings of the first fine flotation and froth concentrate of the first sweeping flotation are returned to the rough flotation;
the primary fine flotation and the rapid flotation are combined to form the foam bulk concentrate with the yield of 0.54 percent, the molybdenum grade of 16 percent, the molybdenum recovery rate of 98.5 percent, the copper grade of 2.1 percent and the copper recovery rate of 75 percent,
3) feeding the foam bulk concentrate of the molybdenum and copper mixed flotation operation into a two-stage closed circuit grinding classification operation consisting of a two-stage ball mill and a cyclone, feeding a product of which the grain size is-0.074 mm and accounts for 95 percent of the two-stage closed circuit grinding classification operation into separation flotation, and feeding the product into molybdenum and copper separation flotation operation;
4) the separation flotation comprises separation flotation, four times of continuous fine flotation operation of molybdenum and copper flotation; wherein the froth concentrate of the separation flotation is fed into molybdenum secondary fine flotation, the froth concentrate of the molybdenum secondary fine flotation is fed into third fine flotation, the froth concentrate of the third fine flotation is fed into fourth fine flotation, the froth concentrate of the fourth fine flotation is fed into fifth fine flotation, the concentrate of the fifth fine flotation is final molybdenum concentrate with the molybdenum grade of 54%, the molybdenum recovery rate of 85%, the copper grade of 0.09% and the yield of 0.156%, the underflow tailings of the fifth fine flotation are returned to the third fine flotation, the underflow tailings of the fourth fine flotation are returned to the second fine flotation, the underflow tailings of the third fine flotation and the underflow tailings of the second fine flotation are returned to the separation flotation; separating the underflow tailings of flotation and feeding the underflow tailings to copper flotation operation;
5) the copper flotation operation adopts a flow structure of primary roughing, tertiary refining and secondary sweeping, wherein the primary roughing is copper roughing flotation, the tertiary refining is continuous tertiary copper fine flotation, the secondary sweeping is continuous secondary copper sweeping flotation, wherein, the concentrate of the copper rough flotation is fed into the copper primary fine flotation, the concentrate of the 1 copper primary fine flotation is fed into the copper secondary fine flotation, the concentrate of the copper secondary fine flotation is fed into the copper tertiary fine flotation, the tailings of the copper rough flotation are fed into the copper primary scavenging flotation, the tailings of the copper primary scavenging flotation are fed into the copper secondary scavenging flotation, the tailings of the copper tertiary fine flotation are fed back to the secondary fine flotation, the tailings of the copper secondary fine flotation are fed back to the copper primary fine flotation, the concentrate of the copper secondary scavenging flotation is fed back to the copper primary scavenging flotation, the concentrate of the copper primary scavenging flotation and the tailings of the copper primary fine flotation are fed back to the copper rough flotation, the concentrate of the copper tertiary fine flotation is the final copper concentrate with the copper grade of 18.2%, the copper recovery rate of 42% and the yield of 0.03;
6) the tailings of secondary scavenging flotation in molybdenum-copper mixed flotation are fed into sulfur flotation operation, the sulfur flotation operation consists of primary and secondary concentration flotation operations, primary coarse flotation is sulfur coarse flotation, secondary fine flotation is continuous secondary sulfur fine flotation, wherein the concentrate of the sulfur coarse flotation is fed into primary sulfur fine flotation, the concentrate of the primary sulfur fine flotation is fed into secondary sulfur fine flotation, the tailings of the secondary sulfur fine flotation are fed back to primary sulfur fine flotation, the tailings of the primary sulfur fine flotation are fed back to sulfur roughing, the concentrate of the secondary sulfur fine flotation is sulfur grade 46%, sulfur recovery rate 63%, yield 0.55% of final sulfur concentrate, the tailings of the sulfur roughing flotation and the tailings of the secondary copper scavenging form final tailings, the tailings yield is 99.26%, the copper recovery rate is 55%, the molybdenum recovery rate is 15%, and the sulfur recovery rate is 37%.
The gangue inhibitor water glass is added into a first-stage ball mill in a first-stage closed circuit ore grinding grading operation consisting of the first-stage ball mill and a swirler, and the addition amount is 1000 g/t.
1000g/t of gangue inhibitor water glass, 50g/t of collector kerosene and 30g/t of foaming agent No. 2 oil are added in the quick flotation of the copper mixed flotation operation; 500g/t of gangue inhibitor water glass, 30g/t of kerosene serving as a collector and 25g/t of foaming agent No. 2 oil are added in the rough flotation operation, and 500g/t of gangue inhibitor water glass is added in the primary concentration operation.
In the separation flotation, the secondary fine flotation, the tertiary fine flotation, the quaternary fine flotation and the quintic fine flotation, 600g/t ore feeding, 500g/t ore feeding, 400g/t ore feeding, 300g/t ore feeding and 200g/t ore feeding gangue inhibitor water glass, 150g/t ore feeding, 120g/t ore feeding, 100g/t ore feeding, 70g/t ore feeding and 30g/t ore feeding copper mineral inhibitor Na are added in sequence2S。
Adding 40g/t of copper collecting agent butyl xanthate into copper rough flotation operation, 150g/t of silicate inhibitor lime into copper, and sequentially adding 120g/t of lime into copper, 80g/t of lime and 60g/t of lime into copper primary fine flotation, secondary fine flotation and tertiary fine flotation; and (3) carrying out primary copper scavenging and secondary copper scavenging, and sequentially adding 20g/t of butyl xanthate for ore feeding and 10g/t of butyl xanthate for ore feeding.
The invention has the advantages that:
1) the process flow of the invention firstly adopts molybdenum and copper mixed flotation tailings, most of the tailings are removed in the primary stage of the flotation, and better indexes of 0.54% of yield, 16% of molybdenum grade, 98.5% of molybdenum recovery rate, 2.1% of copper grade and 75% of copper recovery rate are obtained. The mixed flotation tail-flicking mode greatly reduces the processing amount of operation, and reduces the equipment investment and the operation cost.
2) The process flow of the invention is that the rapid flotation is firstly carried out, the dosage of the added medicament in the rapid flotation is large, so that most of the target minerals are rapidly floated out, the yield of the concentrate of the rapid flotation accounts for about 60 percent of that of the bulk flotation, the processing amount of other flotation operations in the bulk flotation is greatly reduced, and the equipment investment and the operation cost are reduced.
3) The technological process of the invention carries out separation flotation on the products of two-stage grinding of the concentrate of the bulk flotation, and adds the copper mineral inhibitor Na in the separation flotation and the continuous four-time concentrate2S, most of copper minerals are separated to copper flotation operation, and the effects of molybdenum extraction and impurity reduction of molybdenum ores are achieved. Finally, the molybdenum concentrate with 54 percent of molybdenum grade, 85 percent of molybdenum recovery rate, 0.09 percent of copper grade and 0.156 percent of yield is obtained. Under the condition of ensuring the high recovery rate and grade of molybdenum, the grade of copper is reduced to be below 0.15 percent, the product quality requirement of copper concentrate is met, and the economic benefit is improved.
4) The flotation of the molybdenum concentrate after the second-stage ore grinding in the process flow adopts the molybdenum and copper separation flotation operation, the continuous four-time flotation operation and the crossing type tailing return operation, namely the underflow tailings return to the upper-stage concentration operation. Finally, the excellent ore dressing index with the molybdenum grade of 55 percent and the molybdenum recovery rate of 85 percent is obtained.
5) The gangue inhibitor water glass subjected to the rapid flotation in the process flow is added into a section of closed circuit grinding grading operation instead of a traditional flotation tank, so that the contact time of the inhibitor and minerals is increased, the inhibitor is favorably attached to the surface of gangue minerals during grinding, and the inhibiting effect of the gangue is optimized.
6) The copper flotation of the invention adopts a flow structure of primary coarse, tertiary fine and secondary sweeping, and finally obtains the product index with the copper grade of 18.2%, the copper recovery rate of 42% and the yield of 0.038%. The additionally obtained part of the copper concentrate with higher quality can greatly improve the economic benefit of the whole project.
7) The sulfur flotation of the invention adopts a coarse and fine flow structure, and finally obtains product indexes of 46 percent of sulfur grade, 63 percent of sulfur recovery rate and 0.55 percent of yield. The additionally obtained sulfur concentrate with higher quality can greatly improve the economic benefit of the whole project.
Drawings
FIG. 1 is a flow chart of the beneficiation process of molybdenum ore, a three-product of the invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in figure 1, the ore dressing process of the molybdenum ore of the three products of the invention has the advantages that the molybdenum grade in the raw ore is 0.1 percent, the copper grade is 0.015 percent, the sulfur grade is 0.4 percent, and the molybdenum mineral in the raw ore is mainly molybdenite (M)OS2) The copper mineral comprises chalcopyrite (CuFeS)2) And chalcocite (Cu)2S), characterized by comprising the following steps:
raw ore with the granularity of 0-12mm, the molybdenum grade of 0.1%, the copper grade of 0.015% and the sulfur grade of 0.4% is fed into a first-stage closed-circuit ore grinding grading operation consisting of a first-stage ball mill and a cyclone, and the overflow of the first-stage ore grinding cyclone with the granularity of-0.076 mm accounting for 60% is fed into a molybdenum and copper mixed flotation operation;
the gangue inhibitor water glass is added into a first-stage ball mill in a first-stage closed circuit ore grinding grading operation consisting of the first-stage ball mill and a cyclone, and the addition amount is 1000 g/t. The gangue inhibitor water glass is added into a section of closed circuit grinding grading operation instead of a traditional flotation tank, so that the contact time of the inhibitor and minerals is prolonged, the inhibitor is favorably attached to the surface of gangue minerals during grinding, and the gangue inhibition effect is optimized.
The molybdenum and copper mixed flotation operation is direct flotation, a flotation flow process structure of one-fast flotation, one-rough flotation, one-fine flotation and two-sweep flotation is adopted, the one-fast flotation is rapid flotation, the one-rough flotation is rough flotation, the one-fine flotation is rough flotation, the two-sweep flotation is continuous two-sweep flotation, underflow tailings of the rapid flotation are fed into the rough flotation, froth concentrate of the rough flotation is fed into the primary fine flotation, underflow tailings of the rough flotation are fed into the primary sweep flotation, underflow tailings of the primary sweep flotation are fed into the secondary sweep flotation, and underflow tailings of the primary fine flotation and froth concentrate of the primary sweep flotation are returned to the rough flotation;
the primary fine flotation and the rapid flotation are combined to form the foam bulk concentrate with the yield of 0.54 percent, the molybdenum grade of 16 percent, the molybdenum recovery rate of 98.5 percent, the copper grade of 2.1 percent and the copper recovery rate of 75 percent,
1000g/t of gangue inhibitor water glass, 50g/t of collector kerosene and 30g/t of foaming agent No. 2 oil are added in the quick flotation of the copper mixed flotation operation; 500g/t of gangue inhibitor water glass, 30g/t of kerosene serving as a collector and 25g/t of foaming agent No. 2 oil are added in the rough flotation operation, and 500g/t of gangue inhibitor water glass is added in the primary concentration operation.
The mixed flotation tail flicking removes most of tailings in the primary stage of flotation, and the better indexes of 0.54% of yield, 16% of molybdenum grade, 98.5% of molybdenum recovery rate, 2.1% of copper grade and 75% of copper recovery rate are obtained. The mixed flotation tail-flicking mode greatly reduces the processing amount of operation, and reduces the equipment investment and the operation cost.
The invention feeds the foam bulk concentrate of the molybdenum and copper mixed flotation operation into a two-stage closed circuit grinding grading operation consisting of a two-stage ball mill and a cyclone, and feeds a product of which the grain size is-0.074 mm and accounts for 95 percent of the two-stage closed circuit grinding grading operation into the molybdenum and copper separation flotation operation;
the separation flotation comprises separation flotation, four times of continuous fine flotation operation of molybdenum and copper flotation; wherein the froth concentrate of the separation flotation is fed into molybdenum secondary fine flotation, the froth concentrate of the molybdenum secondary fine flotation is fed into third fine flotation, the froth concentrate of the third fine flotation is fed into fourth fine flotation, the froth concentrate of the fourth fine flotation is fed into fifth fine flotation, the concentrate of the fifth fine flotation is final molybdenum concentrate with the molybdenum grade of 54%, the molybdenum recovery rate of 85%, the copper grade of 0.09% and the yield of 0.156%, the underflow tailings of the fifth fine flotation are returned to the third fine flotation, the underflow tailings of the fourth fine flotation are returned to the second fine flotation, the underflow tailings of the third fine flotation and the underflow tailings of the second fine flotation are returned to the separation flotation; separating the underflow tailings of flotation and feeding the underflow tailings to copper flotation operation;
the flotation of the molybdenum concentrate after the second-stage ore grinding in the process flow adopts the molybdenum and copper separation flotation operation, the continuous four-time flotation operation and the crossing type tailing return operation, namely the underflow tailings return to the upper-stage concentration operation. Finally, the excellent ore dressing index with the molybdenum grade of 55 percent and the molybdenum recovery rate of 85 percent is obtained.
The copper flotation operation of the invention adopts a flow structure of one-roughing, three-refining and two-scavenging, wherein the one-roughing is copper roughing flotation, the three-refining is continuous three-time copper refining flotation, the two-scavenging is continuous two-time copper scavenging flotation, wherein, the concentrate of the copper rough flotation is fed into the copper primary fine flotation, the concentrate of the copper primary fine flotation is fed into the copper secondary fine flotation, the concentrate of the copper secondary fine flotation is fed into the copper tertiary fine flotation, the tailings of the copper rough flotation are fed into the copper primary scavenging flotation, the tailings of the copper primary scavenging flotation are fed into the copper secondary scavenging flotation, the tailings of the copper tertiary fine flotation are fed back into the secondary fine flotation, the tailings of the copper secondary fine flotation are fed back into the copper primary fine flotation, the concentrate of the copper secondary scavenging flotation is fed back into the copper primary scavenging flotation, the concentrate of the copper primary scavenging flotation and the tailings of the copper primary fine flotation are fed back into the copper rough flotation, the concentrate of the copper tertiary fine flotation is the final copper concentrate with the copper grade of 18.2%, the copper recovery rate of 42% and the yield of 0.03;
adding 40g/t of copper collecting agent butyl xanthate into copper rough flotation operation, 150g/t of silicate inhibitor lime into copper, and sequentially adding 120g/t of lime into copper, 80g/t of lime and 60g/t of lime into copper primary fine flotation, secondary fine flotation and tertiary fine flotation; and (3) carrying out primary copper scavenging and secondary copper scavenging, and sequentially adding 20g/t of butyl xanthate for ore feeding and 10g/t of butyl xanthate for ore feeding. The copper flotation of the invention adopts a flow structure of primary coarse, tertiary fine and secondary sweeping, and finally obtains the product index with the copper grade of 18.2%, the copper recovery rate of 42% and the yield of 0.038%. The additionally obtained part of the copper concentrate with higher quality can greatly improve the economic benefit of the whole project.
The tailings of secondary scavenging flotation in the molybdenum-copper mixed flotation of the invention are fed into sulfur flotation operation, the sulfur flotation operation consists of primary roughing flotation and secondary concentrating flotation, primary roughing flotation is sulfur roughing flotation, secondary concentrating is continuous secondary sulfur concentrating flotation, wherein, the concentrate of the sulfur roughing flotation is fed into primary sulfur concentrating flotation, the concentrate of the primary sulfur concentrating flotation is fed into secondary sulfur concentrating flotation, the tailings of the secondary sulfur concentrating flotation are fed back to primary sulfur concentrating flotation, the tailings of the primary sulfur concentrating flotation are fed back to sulfur roughing flotation, the concentrate of the secondary sulfur concentrating flotation is sulfur grade 46%, sulfur recovery rate 63%, yield 0.55%, the final sulfur concentrate of the sulfur roughing flotation and the tailings of the secondary copper scavenging flotation form the final tailings, the tailings yield of the sulfur roughing flotation and the tailings of the secondary copper scavenging flotation are 99.26%, the copper recovery rate is 55%, the molybdenum recovery rate is 15%, and the sulfur recovery rate is 37%. The sulfur flotation of the invention adopts a coarse and fine flow structure, and finally obtains product indexes of 46 percent of sulfur grade, 63 percent of sulfur recovery rate and 0.55 percent of yield. The additionally obtained sulfur concentrate with higher quality can greatly improve the economic benefit of the whole project.

Claims (6)

1. A mineral separation process for three-product molybdenum ore comprises 0.1% molybdenum grade, 0.015% copper grade, and 0.4% sulfur grade, wherein the molybdenum mineral in the raw ore is mainly molybdenite (M)OS2) The copper mineral comprises chalcopyrite (CuFeS)2) And chalcocite (Cu)2S), characterized by comprising the following steps:
1) raw ore with the granularity of 0-12mm, the molybdenum grade of 0.1%, the copper grade of 0.015% and the sulfur grade of 0.4% is fed into a first-stage closed-circuit ore grinding grading operation consisting of a first-stage ball mill and a cyclone, and the overflow of the first-stage ore grinding cyclone with the granularity of-0.076 mm accounting for 60% is fed into a molybdenum and copper mixed flotation operation;
2) the molybdenum and copper mixed flotation operation is direct flotation, a flotation flow structure of first quick flotation, first rough flotation, first fine flotation and second sweeping is adopted, the first quick flotation is quick flotation, the first rough flotation is rough flotation, the first fine flotation is first fine flotation, the second sweeping is continuous twice sweeping flotation, underflow tailings of the quick flotation are fed into the rough flotation, froth concentrate of the rough flotation is fed into the first fine flotation, underflow tailings of the rough flotation are fed into the first sweeping flotation, underflow tailings of the first sweeping flotation are fed into the second sweeping flotation, and underflow tailings of the first fine flotation and froth concentrate of the first sweeping flotation are returned to the rough flotation;
the primary fine flotation and the rapid flotation are combined to form the foam mixed concentrate of the molybdenum and copper mixed flotation operation, wherein the yield is 0.54 percent, the molybdenum grade is 16 percent, the molybdenum recovery rate is 98.5 percent, the copper grade is 2.1 percent, and the copper recovery rate is 75 percent;
3) feeding the foam bulk concentrate of the molybdenum and copper mixed flotation operation into a two-stage closed circuit grinding classification operation consisting of a two-stage ball mill and a cyclone, feeding a product of which the grain size is-0.074 mm and accounts for 95 percent of the two-stage closed circuit grinding classification operation into separation flotation, and feeding the product into molybdenum and copper separation flotation operation;
4) the separation flotation comprises separation flotation, four times of continuous fine flotation operation of molybdenum and copper flotation; wherein the froth concentrate of the separation flotation is fed into the molybdenum secondary fine flotation, the froth concentrate of the molybdenum secondary fine flotation is fed into the third fine flotation, the froth concentrate of the third fine flotation is fed into the fourth fine flotation, and the froth concentrate of the fourth fine flotation is fed into the fifth fine flotation; the underflow tailings of the fifth fine flotation return to the third fine flotation, the underflow tailings of the fourth fine flotation return to the second fine flotation, the underflow tailings of the third fine flotation and the underflow tailings of the second fine flotation return to the separation flotation; separating the underflow tailings of flotation and feeding the underflow tailings to copper flotation operation; the concentrate obtained by the five-time concentration is the final molybdenum concentrate with the molybdenum grade of 54 percent, the molybdenum recovery rate of 85 percent, the copper grade of 0.09 percent and the yield of 0.156 percent;
5) the copper flotation operation adopts a flow structure of primary roughing, tertiary refining and secondary sweeping, wherein the primary roughing is copper roughing flotation, the tertiary refining is continuous tertiary copper fine flotation, the secondary sweeping is continuous secondary copper sweeping flotation, wherein, the concentrate of the copper rough flotation is fed into the copper primary fine flotation, the concentrate of the copper primary fine flotation is fed into the copper secondary fine flotation, the concentrate of the copper secondary fine flotation is fed into the copper tertiary fine flotation, the tailings of the copper rough flotation are fed into the copper primary scavenging flotation, the tailings of the copper primary scavenging flotation are fed into the copper secondary scavenging flotation, the tailings of the copper tertiary fine flotation are fed back into the secondary fine flotation, the tailings of the copper secondary fine flotation are fed back into the copper primary fine flotation, the concentrate of the copper secondary scavenging flotation is fed back into the copper primary scavenging flotation, the concentrate of the copper primary scavenging flotation and the tailings of the copper primary fine flotation are fed back into the copper rough flotation, the concentrate of the copper tertiary fine flotation is the final copper concentrate with the copper grade of 18.2%, the copper recovery rate of 42% and the yield of 0.03;
6) the tailings of secondary scavenging flotation in molybdenum-copper mixed flotation are fed into sulfur flotation operation, the sulfur flotation operation consists of primary and secondary concentration flotation operations, primary coarse flotation is sulfur coarse flotation, secondary fine flotation is continuous secondary sulfur fine flotation, wherein the concentrate of the sulfur coarse flotation is fed into primary sulfur fine flotation, the concentrate of the primary sulfur fine flotation is fed into secondary sulfur fine flotation, the tailings of the secondary sulfur fine flotation are fed back to primary sulfur fine flotation, the tailings of the primary sulfur fine flotation are fed back to sulfur roughing, the concentrate of the secondary sulfur fine flotation is sulfur grade 46%, sulfur recovery rate 63%, yield 0.55% of final sulfur concentrate, the tailings of the sulfur roughing flotation and the tailings of the secondary copper scavenging form final tailings, the tailings yield is 99.26%, the copper recovery rate is 55%, the molybdenum recovery rate is 14%, and the sulfur recovery rate is 34%.
2. The process for dressing molybdenum ore according to claim 1, wherein gangue inhibitor water glass is added in an amount of 1000g/t to the first ball mill in the first stage closed circuit grinding classification consisting of the first ball mill and the cyclone.
3. The beneficiation process of the tri-product molybdenum ore according to claim 1, characterized in that 1000g/t gangue inhibitor water glass, 50g/t collector kerosene and 30g/t frother # 2 oil are added in the fast flotation of the copper mixed flotation operation; 500g/t of gangue inhibitor water glass, 30g/t of kerosene serving as a collector and 25g/t of foaming agent No. 2 oil are added in the rough flotation operation, and 500g/t of gangue inhibitor water glass is added in the primary concentration operation.
4. The beneficiation process of the tri-product molybdenum ore according to claim 1, wherein in the separation flotation, the secondary fine flotation, the tertiary fine flotation, the quaternary fine flotation and the quintic fine flotation, gangue depressant sodium silicate of 600g/t ore feeding, 500g/t ore feeding, 400g/t ore feeding, 300g/t ore feeding and 200g/t ore feeding, 150g/t ore feeding, 120g/t ore feeding, 100g/t ore feeding, 70g/t ore feeding and 30g/t ore feeding are added in sequence, and copper mineral depressant Na is added2S。
5. The beneficiation process of the tri-product molybdenum ore according to claim 1, wherein in the copper rough flotation operation, 40g/t of a copper collector butyl xanthate is added, 150g/t of a silicate inhibitor lime is added, primary copper fine flotation, secondary fine flotation and tertiary fine flotation are sequentially added with 120g/t of lime, 80g/t of ore and 60g/t of ore; and (3) carrying out primary copper scavenging and secondary copper scavenging, and sequentially adding 20g/t of butyl xanthate for ore feeding and 10g/t of butyl xanthate for ore feeding.
6. The beneficiation process of the tri-product molybdenum ore according to claim 1, characterized in that the sulfur rough flotation is added with 150g/t ore feeding of sulfide collector butyl xanthate, 20g/t ore feeding of frother 2# oil and 200g/t ore feeding of gangue depressant water glass.
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