CN108283988B - Process for treating mixed iron ore by stage ore grinding magnetic-gravity flow - Google Patents
Process for treating mixed iron ore by stage ore grinding magnetic-gravity flow Download PDFInfo
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- CN108283988B CN108283988B CN201810131708.9A CN201810131708A CN108283988B CN 108283988 B CN108283988 B CN 108283988B CN 201810131708 A CN201810131708 A CN 201810131708A CN 108283988 B CN108283988 B CN 108283988B
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
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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
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
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Abstract
The invention relates to a process for treating mixed iron ore by a stage ore grinding magnetic-gravity process, which comprises the following steps: feeding iron ore with 29.00-30.00% of raw ore grade and 2-0mm of granularity into primary closed circuit grinding ore, feeding primary graded overflow into a primary permanent magnet machine, feeding primary magnetic concentrate into secondary closed circuit grinding ore, feeding secondary graded overflow with 90-95% of granularity of-200 meshes into a secondary permanent magnet machine, feeding secondary magnetic concentrate into a tertiary permanent magnet machine, merging the secondary magnetic tail and the tertiary magnetic tail, concentrating, weak magnetic scavenging and strong magnetic scavenging, merging the weak magnetic scavenging and strong magnetic scavenging into a coarse-primary magnetic concentrate gravity concentration operation, merging the gravity concentration and the tertiary magnetic concentrate into final concentrate with 63.7-65.50% of grade, merging the iron recovery rate into 75.50-77.50% of gravity concentration, and merging the tailings, the primary magnetic tail and the strong magnetic scavenging into final tailings with 10.50-11.40% of grade. The invention can simplify and optimize the existing mineral processing process flow for processing the mixed iron ore and reduce the cost.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a process for treating mixed iron ore by a stage grinding magnetic-gravity process.
Background
Mixed iron ores are iron ores that contain both magnetite and hematite. Due to the differences in physicochemical properties of the two useful minerals magnetite and hematite, two or more combined beneficiation processes are commonly used to process mixed iron ores.
For example, patent No. 200710159126.3 entitled "process for treating mixed iron ore" discloses a process for treating mixed iron ore, which uses two ore dressing methods combining gravity separation and magnetic separation. The method comprises the steps of crushing raw ores, feeding the crushed raw ores into a primary grinding and primary grading to form a closed circuit, performing primary overflow coarse grading, separating coarse grains by using gravity separation equipment, feeding concentrate of a spiral chute into a fine screen with larger screen hole size, obtaining coarse grain concentrate under the screen, performing middle-sweeping magnetic discarding on gravity tailings, combining middle-sweeping magnetic concentrate, middle-gravity concentrate and screen top to obtain coarse grain middlings, feeding middlings into an open-circuit grinding system consisting of secondary grading and secondary grinding for regrinding, returning to coarse and fine grading after regrinding, separating fine grains after coarse and fine grading by using magnetic separation equipment, feeding magnetic concentrate into a fine screen with smaller screen holes, obtaining fine grain concentrate under the screen, feeding a secondary grinding system on the screen, combining the fine grains and the coarse grain concentrate into final concentrate, and combining the middle-sweeping magnetic tailings and the magnetic tailings into final tailings.
For example, the process for processing the mixed iron ore by the Sedan-Gaizhan ore dressing plant comprises stage grinding, coarse and fine separation and magnetic-gravity-floating combined separation process, and three ore dressing methods combining magnetic separation, gravity separation and flotation are adopted.
In a word, no matter which combined beneficiation method is adopted to treat the mixed iron ore, the problems of long and complicated process flow, more influence links, difficult management and high operation cost exist.
Disclosure of Invention
The invention aims to provide a process for treating mixed iron ore by a stage ore grinding magnetic-gravity process.
The present invention is thus achieved.
The invention relates to a process for treating mixed iron ore by a stage ore grinding magnetic-gravity flow, which is characterized by comprising the following steps of:
1) feeding mixed iron ore with the raw ore grade of 29.00-30.00% and the granularity of 2-0mm into a primary closed circuit ore grinding system formed by primary grinding and primary classification, feeding a primary classification overflow product with the overflow granularity range of-200 meshes and 60-65% into a primary permanent magnet drum type magnetic separator for operation, merging tailings of the primary permanent magnet drum type magnetic separator into final tailings, feeding concentrate of the primary permanent magnet drum type magnetic separator into secondary classification, forming a secondary closed circuit ore grinding system by the secondary classification and the secondary grinding, feeding a secondary classification overflow product with the granularity of-200 meshes and the content of 90-95% into a secondary permanent magnet drum type magnetic separator as a final product of stage grinding, feeding concentrate of the secondary permanent magnet drum type magnetic separator into a tertiary permanent magnet drum type magnetic separator, merging concentrate of the tertiary permanent magnet drum type magnetic separator into final concentrate, and merging tailings of the secondary permanent magnet drum type magnetic separator and tailings of the tertiary permanent magnet drum type magnetic separator into a concentrator for feeding;
2) overflow of the thickener is used as backwater, underflow of the thickener is fed into a scavenging weak magnetic machine, tailings of the scavenging weak magnetic machine are fed into a strong magnetic machine, the tailings of the strong magnetic machine are merged into final tailings, concentrate of the scavenging weak magnetic machine and concentrate of the strong magnetic machine are merged into mixed magnetic concentrate, and the mixed magnetic concentrate is fed into reselection operation;
3) the mixed magnetic concentrate is fed into a primary centrifuge for primary roughing, the primary centrifuge tailings, the strong magnetic machine tailings and the primary permanent magnetic drum type magnetic separator tailings are combined to form final tailings, the primary centrifuge concentrate is fed into a secondary centrifuge for refining, the secondary centrifuge tailings are returned to the primary centrifuge for feeding as middlings, the secondary centrifuge concentrate and the concentrate of the secondary permanent magnetic drum type magnetic separator are combined to form final concentrate, the grade of the final tailings is 10.50% -11.40%, the grade of the final concentrate is 63.7% -65.50%, and the iron recovery rate is 75.50% -77.50%.
The primary permanent magnetic cylinder magnetic separator, the secondary permanent magnetic cylinder magnetic separator and the tertiary permanent magnetic cylinder magnetic separator are BX permanent magnetic cylinder magnetic separators phi 400 multiplied by 400mm, a semi-countercurrent bottom box, a magnetic wrap angle is 250 degrees, and the magnetic induction intensity is 400mT-1000 mT.
The invention has the advantages that:
1. according to the invention, the first half main flow, namely the flow of the magnetic separation part in the stage grinding stage, selects qualified concentrate which accounts for more than 80% of the final concentrate in advance, and realizes that the qualified concentrate is taken out in advance;
2. the permanent magnet separator which is simple in structure and high in performance can simplify and optimize the existing complex ore dressing process for treating the mixed iron ore;
3. compared with other combined ore dressing methods for treating mixed iron ore, the method can save 40-60 yuan per ton of concentrate, and create more economic benefits for ore dressing plants.
Drawings
FIG. 1 is a process flow chart of a stage grinding magnetic-gravity process for treating mixed iron ore.
Detailed Description
The invention is further illustrated by the following figures and examples.
Examples
As shown in fig. 1: the invention relates to a process for treating mixed iron ore by a stage ore grinding magnetic-gravity flow, which comprises the following steps:
1) feeding mixed iron ore with the raw ore grade of 30.00 percent and the granularity of 2-0mm into a primary closed circuit ore grinding system formed by primary grinding and primary classification, feeding primary classification overflow products with the overflow granularity range of-200 meshes of 60-65 percent into a primary permanent magnet drum magnetic separator for operation, merging tailings of the primary permanent magnet drum magnetic separator with the grade of 8.40 percent and the yield of 32.10 percent into final tailings, feeding concentrate of the primary permanent magnet drum magnetic separator with the grade of 41.00 percent and the yield of 67.90 percent into secondary classification, forming a secondary closed circuit ore grinding system by the secondary classification and the secondary grinding, feeding secondary classification overflow products with the granularity of-200 meshes of 90-95 percent into a secondary permanent magnet drum magnetic separator as final products of stage grinding, feeding concentrate of the secondary permanent magnet drum magnetic separator with the grade of 62.00 percent and the yield of 33.13 percent into a tertiary permanent magnet drum magnetic separator, concentrate of a tertiary permanent magnet drum type magnetic separator with the grade of 64.40% and the yield of 29.30% is merged into final concentrate, tailings of a secondary permanent magnet drum type magnetic separator with the grade of 21.00% and the yield of 34.77% and tailings of the tertiary permanent magnet drum type magnetic separator with the grade of 31.00% and the yield of 3.83% are merged into permanent magnet machine tailings, and the permanent magnet machine tailings with the grade of 21.99% and the yield of 38.60% are fed into a thickener;
2) overflow of a thickener is used as backwater, underflow of the thickener is fed into a scavenging weak magnetic machine, tailings of the scavenging weak magnetic machine are fed into a strong magnetic machine, tailings of the scavenging strong magnetic machine with the grade of 10.21% and the yield of 57.20% are merged into final tailings, concentrate of the scavenging weak magnetic machine with the grade of 48.01% and the yield of 5.00% and concentrate of the scavenging strong magnetic machine with the grade of 33.93% and the yield of 8.50% are merged into mixed magnetic concentrate, the grade of the mixed magnetic concentrate is 39.14%, the yield is 13.50%, and the mixed magnetic concentrate is fed into reselection operation;
3) feeding the mixed magnetic concentrate into a primary centrifuge for primary roughing, combining primary centrifuge tailings with the grade of 18.0% and the yield of 7.80%, scavenging strong magnetic machine tailings and primary permanent magnet drum magnetic separator tailings into final tailings, wherein the final tailings have the grade of 11.15% and the yield of 65.01%; the concentrate of the primary centrifuge with the grade of 62.01% and the yield of 8.01% is fed into a secondary centrifuge for concentration, tailings of the secondary centrifuge are returned to the primary centrifuge for feeding as middlings, the concentrate of the secondary centrifuge with the grade of 68.08% and the yield of 5.70% is combined with the concentrate of the secondary permanent magnet drum magnetic separator to be used as final concentrate, the grade of the final concentrate is 65.00%, the yield of 34.99%, and the iron recovery rate is 75.83%.
The primary permanent magnetic cylinder magnetic separator, the secondary permanent magnetic cylinder magnetic separator and the tertiary permanent magnetic cylinder magnetic separator are BX permanent magnetic cylinder magnetic separators phi 400 multiplied by 400mm, a semi-countercurrent bottom box, a magnetic wrap angle is 250 degrees, and the magnetic induction intensity is 400mT-1000 mT.
According to the invention, the first half of main flow is the flow of the magnetic separation part in the stage grinding stage, the yield of qualified concentrate selected by the main flow is 29.29%, the yield of final concentrate is 35.00%, and the percentage of the qualified concentrate is 83.70%. The method shows that most of the concentrate is selected by a low-cost permanent magnetic separation method, so that qualified concentrate is taken out in advance, and the process operation cost is low.
Claims (1)
1. A process for treating mixed iron ore by stage grinding magnetic-gravity process is characterized by comprising the following steps:
1) feeding mixed iron ore with the raw ore grade of 29.00-30.00% and the granularity of 2-0mm into a primary closed circuit ore grinding system formed by primary grinding and primary classification, feeding a primary classification overflow product with the overflow granularity range of-200 meshes and 60-65% into a primary permanent magnet drum type magnetic separator for operation, merging tailings of the primary permanent magnet drum type magnetic separator into final tailings, feeding concentrate of the primary permanent magnet drum type magnetic separator into secondary classification, forming a secondary closed circuit ore grinding system by the secondary classification and the secondary grinding, feeding a secondary classification overflow product with the granularity of-200 meshes and the content of 90-95% into a secondary permanent magnet drum type magnetic separator as a final product of stage grinding, feeding concentrate of the secondary permanent magnet drum type magnetic separator into a tertiary permanent magnet drum type magnetic separator, merging concentrate of the tertiary permanent magnet drum type magnetic separator into final concentrate, and merging tailings of the secondary permanent magnet drum type magnetic separator and tailings of the tertiary permanent magnet drum type magnetic separator into a concentrator for feeding;
2) overflow of the thickener is used as circulating water, underflow of the thickener is fed into a scavenging weak magnetic machine, tailings of the scavenging weak magnetic machine are fed into a strong magnetic machine, the tailings of the strong magnetic machine are merged into final tailings, concentrate of the scavenging weak magnetic machine and concentrate of the strong magnetic machine are merged into mixed magnetic concentrate, and the mixed magnetic concentrate is fed into reselection operation;
3) feeding the mixed magnetic concentrate into a primary centrifugal machine for primary roughing, combining the tailings of the primary centrifugal machine, the tailings of the strong magnetic machine and the tailings of the primary permanent magnetic drum type magnetic separator into final tailings, feeding the concentrate of the primary centrifugal machine into a secondary centrifugal machine for fine separation, returning the tailings of the secondary centrifugal machine as middlings to the primary centrifugal machine for feeding, combining the concentrate of the secondary centrifugal machine and the concentrate of the secondary permanent magnetic drum type magnetic separator into final concentrate, wherein the grade of the final tailings is 10.50-11.40%,
the primary permanent magnetic cylinder magnetic separator, the secondary permanent magnetic cylinder magnetic separator and the tertiary permanent magnetic cylinder magnetic separator are BX permanent magnetic cylinder magnetic separators phi 400 multiplied by 400mm, a semi-countercurrent bottom box, a magnetic wrap angle is 250 degrees, and the magnetic induction intensity is 400mT-1000 mT.
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Patent Citations (11)
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