CN112808447A - Grading grinding and selecting process for lean hematite pre-selection coarse-grained concentrate - Google Patents
Grading grinding and selecting process for lean hematite pre-selection coarse-grained concentrate Download PDFInfo
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- CN112808447A CN112808447A CN202110108064.3A CN202110108064A CN112808447A CN 112808447 A CN112808447 A CN 112808447A CN 202110108064 A CN202110108064 A CN 202110108064A CN 112808447 A CN112808447 A CN 112808447A
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- 239000012141 concentrate Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910052595 hematite Inorganic materials 0.000 title claims abstract description 18
- 239000011019 hematite Substances 0.000 title claims abstract description 18
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000005188 flotation Methods 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 19
- 230000002000 scavenging effect Effects 0.000 claims abstract description 3
- 239000006148 magnetic separator Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 235000011868 grain product Nutrition 0.000 abstract 1
- 238000004094 preconcentration Methods 0.000 description 15
- 238000000926 separation method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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Abstract
The invention relates to a classification grinding and selecting process of lean hematite pre-selection coarse-grained concentrate, which comprises the step of feeding the lean hematite with the grade of 24-26% into a coarse-grained wet pre-selection process to obtain the pre-selection coarse-grained concentrate, and is characterized in that the post-treatment adopts a pre-classification, stage grinding, stage strong magnetic tailing throwing and reverse flotation process, and specifically comprises the following steps: 1. feeding the pre-selected coarse-grained concentrate into a flat-bottom concentration grading cyclone for pre-grading to obtain pre-graded sand setting and pre-graded overflow; 2. feeding the pre-graded settled sand into a first-stage ball mill, and directly feeding the pre-graded overflow into a secondary cyclone; 3. and feeding the second-stage bulk concentrate into reverse flotation, and performing primary coarse-fine-scavenging and tertiary scavenging to obtain final flotation concentrate with the grade of 65-66% and the yield of 25-27%. The invention has the advantages that: 1. the concentration requirement of a first-stage mill is met, and the production is stable; 2. the fine grain products are classified in advance, the load of a first-stage mill is reduced, and energy is saved and consumption is reduced.
Description
Technical Field
The invention belongs to the technical field of lean iron ore dressing processes, and particularly relates to a classifying, grinding and dressing process for pre-dressing coarse-grained concentrate of lean hematite.
Background
A certain concentrating plant adopts the processes of 'coarse grain wet-type pre-concentration, stage ore grinding, stage strong magnetic tailing throwing-reverse flotation' to treat the extremely poor hematite. Feeding the coarse-broken lean hematite with the grade of 24-26% into a semi-autogenous mill, discharging ore from the semi-autogenous mill, feeding the coarse-broken lean hematite into a linear vibrating screen with the screen mesh size of 3 mm, screening, returning the oversize product to the semi-autogenous mill, feeding the undersize product of the linear vibrating screen with the grain size of 3-0 mm into a wet type pre-concentration weak magnetic separator, feeding the tailings of the pre-concentration weak magnetic separator into a wet type pre-concentration strong magnetic separator, and throwing the tailings of the pre-concentration strong magnetic separator as coarse-grained tailings; and combining the pre-concentration low-intensity magnetic concentrate and the pre-concentration strong magnetic concentrate to obtain wet pre-concentration coarse-grained concentrate with the grade of 29-31%, wherein the pre-concentration coarse-grained concentrate is processed by adopting the subsequent technological processes of stage grinding, stage strong magnetic tailing discarding and reverse flotation. In the production flow of the first-stage grinding and grading operation, because the concentration of the wet pre-separation coarse-grained concentrate is only 20% -23%, the pre-separation coarse-grained concentrate is fed into a first-stage conventional hydrocyclone of the first-stage grinding, settled sand of the first-stage conventional hydrocyclone is fed into a first-stage grinding machine, ore discharge of the first-stage grinding machine is returned to the first-stage conventional hydrocyclone, and overflow of the first-stage conventional hydrocyclone is fed into subsequent grading operation. There is a problem in the specific production: because the granularity of the pre-selected coarse-grained concentrate is thicker, the sand setting opening of the conventional hydrocyclone at the first section is abraded too fast, the granularity of an overflow product cannot be guaranteed, and the normal operation of the subsequent sorting operation is influenced.
Disclosure of Invention
The invention aims to provide a classifying, grinding and sorting process for lean hematite pre-concentration coarse-grained concentrate, which is used for meeting the concentration requirement of a ball mill for treating the pre-concentration coarse-grained concentrate in the production, simultaneously classifying partial fine-grained products in advance, reducing the grinding amount of the ball mill in the first section, saving energy, reducing consumption, providing conditions for subsequent operation and improving the overall grinding and sorting efficiency.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a classifying grinding and selecting process of lean hematite pre-selection coarse grain concentrate, which comprises the steps of feeding lean hematite with the grade of 24-26% into a coarse grain wet pre-selection process, throwing out pre-selection coarse grain tailings with the grade of 7-8% and the yield of 20-21%, and obtaining pre-selection coarse grain concentrate with the grade of 29-31% and the concentration of 20-23%, and is characterized in that the pre-selection coarse grain concentrate is subjected to pre-classification, stage grinding and stage strong magnetic tailing throwing-reverse flotation processes in the subsequent treatment, and specifically comprises the following steps:
step 1, feeding pre-selected coarse concentrate into a flat-bottom concentration grading cyclone for pre-grading treatment to obtain a pre-graded sand setting product with the concentration of 70% -72%, the grade of 28% -29% and the yield of 57% -60% and a pre-graded overflow product with the concentration of 4% -6%, the grade of 36% -37% and the yield of 19% -21%;
step 2, feeding the pre-classified sand setting product into a first-stage ball mill, feeding ore discharged from the first-stage ball mill into a first cyclone for primary classification, returning the primary classified sand setting product to the first-stage ball mill, feeding a primary classified overflow product with the granularity of-200 meshes accounting for 59% -61% into a first-stage weak magnetic separator, and obtaining a first-stage weak magnetic concentrate with the yield of 10% -11% and the grade of 53% -54%; feeding the first-section weak magnetic tailings with the grade of 23% -24% into a first-section strong magnetic separator for discarding the tailings to obtain first-section strong magnetic concentrate with the grade of 35% -36% and the yield of 27% -29%, and discarding first-section strong magnetic tailings with the grade of 6% -7% and the yield of 21% -22%; the first-stage weak magnetic concentrate, the first-stage strong magnetic concentrate and the pre-grading overflow product are combined and fed into a secondary cyclone for secondary grading, a secondary grading sand setting product is fed into a second-stage tower mill, ore discharge of the second-stage tower mill is 75% -77% in concentration and returns to the secondary cyclone, the secondary grading overflow product with the grade of 35% -37% and the granularity of-325 meshes is fed into a second-stage weak magnetic separator, second-stage weak magnetic concentrate with the grade of 58% -59% and the yield of 8% -9% is obtained, second-stage weak magnetic tailings with the grade of 35% -36% are fed into the second-stage strong magnetic separator, second-stage strong magnetic concentrate with the grade of 47% -49% and the yield of 32% -34% is obtained, second-stage strong magnetic tailings with the grade of 12% -14% and the yield of 16% -18% are thrown out, and the second-stage weak magnetic concentrate and the second-stage strong magnetic concentrate are combined into second-stage mixed concentrate with the grade of;
step 3, feeding the second-stage bulk concentrate into reverse flotation, performing primary coarse-primary fine-three scavenging to obtain final flotation concentrate with the grade of 65-66% and the yield of 25-27%, and throwing flotation tailings with the grade of 18-19% and the yield of 13-15%;
and combining the pre-selected coarse tailings, the first-stage strong magnetic tailings, the second-stage strong magnetic tailings and the flotation tailings into final tailings, wherein the grade of the final tailings is 10% -12%, and the yield is 73% -75%.
Design basis of the invention
The flat bottom cyclone is also called a column type cyclone and consists of a tangentially fed feeding pipe, a hollow cylindrical inner grading cavity, an overflow pipe and a sand settling nozzle, wherein the main grading space is cylindrical, and high-concentration circulating flow exists at the bottom of the flat bottom cyclone; on the other hand, the circulating flow can send the entrained high-density fine particles back to the inner cyclone again, thereby reducing the entrainment of the fine particles in the underflow and improving the classification efficiency of the cyclone. The cyclone with the structure has the following characteristics: (1) under the condition of low concentration, the method has a good grading effect on coarse-grained materials, and realizes efficient grading of the coarse-grained materials. (2) The cone is short or has no cone structure, so that the cyclone is not easy to block in the operation process, and the stable operation of production is ensured. (3) The cyclone has simple structure, reduces the number of easy-to-damage parts and has lower maintenance cost.
Aiming at the characteristics of low concentration and coarse granularity of the lean hematite pre-concentration coarse grain concentrate, a flat-bottom structure cyclone is adopted in a laboratory to firstly concentrate and grade the pre-concentration coarse grain concentrate, the granularity composition of the pre-concentration coarse grain concentrate is analyzed, and the result shows that: the content of-200 meshes in the pre-selected coarse grain concentrate is more than 20%, after the pre-selected coarse grain concentrate is concentrated and graded through a flat bottom structure cyclone, overflow products with the concentration of 4% -6%, the operation yield of more than 25% and the content of-200 meshes of more than 46% and settled sand products with the concentration of 70% -72% can be obtained, the settled sand products are directly fed into a first-section ball mill for first-section grinding, the requirement of first-section grinding concentration is met, and the production is stabilized; the fine overflow product with the operation yield of more than 25 percent is combined with the first-stage mixed magnetic concentrate obtained after the first-stage grinding and sorting, the mixture is directly fed into a conventional cyclone of a second-stage grinding and grading closed-loop process, the granularity composition and the grade of the mixture are similar to those of the first-stage mixed magnetic concentrate, two products are ground and graded by the second-stage cyclone and then subjected to second-stage strong magnetic tailing discarding, and the obtained second-stage mixed magnetic concentrate is fed into reverse flotation and sorting to obtain the final qualified concentrate.
Compared with the prior art, the invention has the advantages that:
1. the concentration requirement of the first-stage ball mill for processing the lean hematite coarse grain pre-concentration concentrate is met;
2. part of fine-grained products are classified in advance, the first-stage ore grinding treatment capacity is reduced, the ore grinding energy consumption of the ball mill is reduced, and the ore grinding cost is reduced;
3. stable production and improved ore grinding processing capacity of the first-stage ball mill.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Examples
As shown in fig. 1, in the classification grinding and separation process of lean hematite pre-selection coarse grain concentrate, lean hematite with a grade of 25.56% after coarse crushing is fed into a coarse grain wet pre-selection process, specifically, the lean hematite is subjected to closed circuit grinding consisting of a semi-autogenous mill and a linear vibrating screen with a screen aperture size of 3 mm, an undersize product with a granularity of 3-0 mm is subjected to two-stage continuous separation by a wet pre-selection weak magnetic separator and a wet pre-selection strong magnetic separator, and pre-selection coarse grain tailings with a grade of 7.86% and a yield of 22.67% are thrown out, so that pre-selection coarse grain concentrate with a grade of 30.75% and a concentration of 22.8% is obtained, and the classification grinding, stage strong magnetic tailing throwing and reverse flotation processes are adopted for the post-treatment of the pre-selection coarse grain concentrate, and the:
step 1, feeding the pre-selected coarse concentrate into a flat-bottom concentration grading cyclone for pre-grading treatment to obtain a pre-graded settled sand product with the concentration of 71.42%, the grade of 28.92% and the yield of 57.97% and a pre-graded overflow product with the concentration of 4.86%, the grade of 36.23% and the yield of 19.36%;
step 2, feeding the pre-classified sand setting product into a first-section ball mill, feeding the discharged ore of the first-section ball mill into a first cyclone for primary classification, returning the primary classified sand setting product to the first-section ball mill, feeding a primary classified overflow product with the granularity of-200 meshes and 60% into a first-section weak magnetic separator to obtain a first-section weak magnetic concentrate and a first-section weak magnetic tailing with the yield of 10.71% and the grade of 53.5%, feeding a first-section weak magnetic tailing with the grade of 23.35% into a first-section strong magnetic separator to discard, obtaining a first-section strong magnetic concentrate with the grade of 35.4% and the yield of 27.22%, and discarding a first-section strong magnetic tailing with the grade of 6.98% and the yield of 20.04%; merging the first-stage weak magnetic concentrate, the first-stage strong magnetic concentrate and the pre-graded overflow product, feeding the merged product into a secondary cyclone for secondary grading, feeding a secondary graded sand setting product into a secondary tower mill, discharging ore of the secondary tower mill with the concentration of 78% -80% and returning the ore to the secondary cyclone, feeding the secondary graded overflow product with the grade of 39.06% and the granularity of-325 meshes above 85% into a secondary weak magnetic separator, obtaining a secondary weak magnetic concentrate and a secondary weak magnetic tailing with the grade of 58.5% and the yield of 8.23%, feeding the secondary weak magnetic tailing with the grade of 35.8% into a secondary strong magnetic separator, obtaining a secondary strong magnetic concentrate with the grade of 47% and the yield of 32.44%, throwing out a secondary strong magnetic tailing with the grade of 13.95% and the yield of 16.63%, and merging the secondary weak magnetic concentrate and the secondary strong magnetic concentrate into a secondary mixed concentrate with the grade of 49.33%;
step 3, feeding the second-stage bulk concentrate into reverse flotation, and performing primary coarse-fine and three-sweep flotation to obtain final flotation concentrate with the grade of 65.5% and the yield of 26.55%, wherein the flotation tailings with the grade of 18.9% and the yield of 14.11%;
and the pre-selected coarse tailings, the first-stage strong magnetic tailings, the second-stage strong magnetic tailings and the flotation tailings are combined into final tailings, the grade of the final tailings is 11.12%, and the yield is 73.45%.
Claims (1)
1. A classification grinding and selecting process for lean hematite pre-selection coarse-grained concentrate comprises the steps of feeding the lean hematite with the grade of 24% -26% into a coarse wet pre-selection process, throwing out pre-selection coarse-grained tailings with the grade of 7% -8% and the yield of 22% -23%, and obtaining the pre-selection coarse-grained concentrate with the grade of 29% -31% and the concentration of 20% -23%, and is characterized in that the pre-selection coarse-grained concentrate is subjected to pre-classification, stage grinding and stage strong magnetic tailing throwing-reverse flotation processes in the follow-up treatment process, and specifically comprises the following steps:
step 1, feeding pre-selected coarse concentrate into a flat-bottom concentration grading cyclone for pre-grading treatment to obtain a pre-graded sand setting product with the concentration of 70% -72%, the grade of 28% -29% and the yield of 57% -60% and a pre-graded overflow product with the concentration of 4% -6%, the grade of 36% -37% and the yield of 19% -21%;
step 2, feeding the pre-classified sand setting product into a first-stage ball mill, feeding ore discharged from the first-stage ball mill into a first cyclone for primary classification, returning the primary classified sand setting product to the first-stage ball mill, feeding a primary classified overflow product with the granularity of-200 meshes accounting for 59% -61% into a first-stage weak magnetic separator, and obtaining a first-stage weak magnetic concentrate with the yield of 10% -11% and the grade of 53% -54%; feeding the first-section weak magnetic tailings with the grade of 23% -24% into a first-section strong magnetic separator for discarding the tailings to obtain first-section strong magnetic concentrate with the grade of 35% -36% and the yield of 27% -29%, and discarding first-section strong magnetic tailings with the grade of 6% -7% and the yield of 21% -22%; the method comprises the following steps of combining a first-stage weak magnetic concentrate, a first-stage strong magnetic concentrate and a pre-grading overflow product, feeding the mixture into a secondary cyclone for secondary grading, feeding a secondary grading sand setting product into a secondary tower mill, discharging ore of the secondary tower mill with the concentration of 75% -77% and returning the ore to the secondary cyclone, feeding the secondary grading overflow product with the grade of 35% -37% and the granularity of-325 meshes above 85% into a secondary weak magnetic separator, obtaining a second-stage weak magnetic concentrate with the grade of 58% -59% and the yield of 8% -9%, feeding the second-stage weak magnetic tailings with the grade of 35% -36% into a secondary strong magnetic separator, obtaining a second-stage strong magnetic concentrate with the grade of 47% -48% and the yield of 32% -34%, throwing out a second-stage strong magnetic tailings with the grade of 12% -14% and the yield of 16% -18%, and combining the second-stage weak magnetic concentrate and the second-stage strong magnetic concentrate into a second-stage mixed concentrate with the grade;
step 3, feeding the second-stage bulk concentrate into reverse flotation, performing primary coarse-primary fine-three scavenging to obtain final flotation concentrate with the grade of 65-66% and the yield of 25-27%, and throwing flotation tailings with the grade of 18-19% and the yield of 13-15%;
and combining the pre-selected coarse tailings, the first-stage strong magnetic tailings, the second-stage strong magnetic tailings and the flotation tailings into final tailings, wherein the grade of the final tailings is 10% -12%, and the yield is 73% -75%.
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Cited By (1)
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|---|---|---|---|---|
| CN114887758A (en) * | 2022-04-26 | 2022-08-12 | 鞍钢集团矿业有限公司 | Magnetic iron ore stage grinding and selecting process with sand setting and tailing throwing functions |
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