CN111437972A - Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder - Google Patents
Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder Download PDFInfo
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- CN111437972A CN111437972A CN202010293777.7A CN202010293777A CN111437972A CN 111437972 A CN111437972 A CN 111437972A CN 202010293777 A CN202010293777 A CN 202010293777A CN 111437972 A CN111437972 A CN 111437972A
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- ore
- ore pulp
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- fine grinding
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- 238000000227 grinding Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 28
- 239000000843 powder Substances 0.000 title claims abstract description 16
- 238000000498 ball milling Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000002562 thickening agent Substances 0.000 claims abstract description 8
- 238000005456 ore beneficiation Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 238000003801 milling Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- 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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Disintegrating Or Milling (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to an oxide ore beneficiation fine grinding process, a system and fine grinding mineral powder, belonging to the technical field of beneficiation; the oxide ore dressing and fine grinding process comprises the following steps: returning the first underflow pulp to primary ball milling and regrinding to form a closed circuit; performing two-stage cyclone classification on the first overflow ore pulp to obtain a second overflow ore pulp and a second underflow ore pulp; returning the second underflow ore pulp to secondary ball milling and regrinding to form a closed circuit, performing water conservancy rotational flow concentration on the second overflow ore pulp to obtain concentrated overflow ore pulp and concentrated underflow ore pulp, directly feeding the concentrated underflow ore pulp into a filter for filtering, and filtering to obtain dry ore powder; or, the concentrated overflow ore pulp enters a thickener for secondary concentration, and the concentrated overflow ore pulp also enters a filter for filtration to obtain dry ore powder after filtration. Through the combined use of screening, ball milling and grading rotational flow, the phenomenon of easy over-grinding of oxidized ores in a grinding machine is effectively avoided, the ball milling energy is saved, and the ore milling cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of ore dressing, and particularly relates to an oxide ore dressing fine grinding process, an oxide ore dressing fine grinding system and fine ground ore powder.
Background
In the iron ore industry, the oxidized ore has large reserves, high grade and low mining and exploiting cost, and is a resource with competitive advantages in the market, tests show that the oxidized ore pelletizing has good metallurgical performance and low energy cost, can become an important raw material for smelting and pelletizing in future, mainly concentrates on the ore dressing stage in the technical problem of limiting the large-scale use of the oxidized ore at present, and adopts the traditional magnetic reduction roasting method to realize complex ore dressing process and high ore dressing and processing cost; the method selects part of high-grade and low-harmful oxidized ores to be directly subjected to ore dressing and fine grinding, has simple production process and low processing cost, and is a development direction in the future.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide an oxide ore beneficiation fine grinding process, system, fine ground ore powder that overcomes or at least partially solves the above problems.
The embodiment of the invention provides an oxide ore dressing and fine grinding process, which comprises the following steps:
screening the oxidized ore to obtain an oversize ore and an undersize ore;
performing primary ball milling on the oversize ore to obtain a first milled ore;
performing primary cyclone classification on the primary ground ore and the undersize ore to obtain first overflow ore pulp and first underflow ore pulp;
carrying out secondary ball milling on the first underflow pulp to obtain a second ore grinding;
performing two-stage cyclone classification on the first overflow ore pulp and the second grinding ore pulp to obtain second overflow ore pulp and second underflow ore pulp;
and filtering, concentrating and drying the second underflow ore pulp to obtain the fine ground ore powder.
Furthermore, the particle size of the undersize ore is less than or equal to 1 mm.
Further, the grain size of the first ore grinding is less than or equal to 150 um.
Further, the grain size of the second ore grinding is less than or equal to 75 um.
Further, the fine grinding process further comprises: and circularly carrying out ball milling and cyclone classification on the second underflow ore pulp until the concentration of the underflow ore pulp obtained by cyclone classification is more than 55%.
Based on the same invention concept, the embodiment of the invention also provides an oxidized ore beneficiation and fine grinding system, which is used for matching with the oxidized ore beneficiation and fine grinding process and comprises the following steps:
based on the same invention concept, the embodiment of the invention also provides the fine grinding mineral powder for oxide ore beneficiation, and the fine grinding mineral powder is prepared by the fine grinding process.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the oxide ore dressing fine grinding process provided by the embodiment of the invention comprises the following steps: screening the oxidized ore to obtain an oversize ore and an undersize ore; performing primary ball milling on the oversize ore to obtain a first milled ore; performing primary cyclone classification on the primary ground ore and the undersize ore to obtain first overflow ore pulp and first underflow ore pulp; carrying out secondary ball milling on the first underflow pulp to obtain a second ore grinding; performing two-stage cyclone classification on the first overflow ore pulp and the second grinding ore pulp to obtain second overflow ore pulp and second underflow ore pulp; and filtering, concentrating and drying the second underflow ore pulp to obtain the fine ground ore powder. Through the combined use of screening, ball milling and classification rotational flow, the phenomenon of easy over-grinding of oxidized ores in a grinding machine is effectively avoided, the ball milling energy is saved, and the ore milling cost is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of the process of the oxide ore dressing and fine grinding in the embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The terms "first", "second", and the like used in the present invention do not denote order, and may be understood as nouns.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided an oxide ore dressing and fine grinding process, including:
screening the oxidized ore to obtain an oversize ore and an undersize ore;
performing primary ball milling on the oversize ore to obtain a first milled ore;
performing primary cyclone classification on the primary ground ore and the undersize ore to obtain first overflow ore pulp and first underflow ore pulp;
returning the first underflow pulp to primary ball milling and regrinding to form a closed circuit;
performing two-stage cyclone classification on the first overflow ore pulp to obtain a second overflow ore pulp and a second underflow ore pulp;
returning the second underflow slurry to secondary ball milling and regrinding to form a closed circuit;
performing water conservancy rotational flow concentration on the second overflow ore pulp to obtain concentrated overflow ore pulp and concentrated bottom ore pulp, directly feeding the concentrated bottom ore pulp into a filter for filtering, and filtering to obtain dry ore powder;
or, the concentrated overflow ore pulp enters a thickener for secondary concentration, and the concentrated overflow ore pulp also enters a filter for filtration to obtain dry ore powder after filtration.
The first-stage grinding is performed with fine particle pre-screening by using a vibrating screen, and the second-stage grinding is performed with pre-grading by using a cyclone, so that the grinding amount of fine particle minerals is greatly reduced, and the phenomenon of over-grinding and ultra-fine of oxidized ores is reduced; the filter adopts a sectional and layered filter, and the filtering and drying effects are good.
As shown in fig. 1, the oxide ore dressing fine grinding process specifically includes:
1. the production process of the oxide ore dressing fine mill mainly comprises a linear vibrating screen, a primary ball mill, a primary cyclone, a secondary ball mill, a secondary cyclone, a concentration cyclone, a high-efficiency thickener, a vacuum filter and the like; the oxidized ore beneficiation production process mainly comprises the steps of 1, feeding oxidized ore into a linear vibrating screen for screening through a belt conveyor, a storage bin, a disc feeder and other equipment;
2. after screening, directly feeding the undersize ore into a first-stage cyclone, and feeding the oversize ore into a primary ball mill for grinding;
3. feeding ore pulp subjected to primary ball mill grinding and undersize ore into a first-stage cyclone for classification under pressure through a slurry pump;
4. the ore pulp with fine granularity (overflow) graded by the cyclone flows into a second-stage cyclone, and the ore pulp with underflow (coarse granularity) of the first-stage cyclone automatically flows back to a primary ball mill through a pipeline for regrinding;
5. the ore pulp entering the secondary cyclone classification enters a secondary ball mill for regrinding through the underflow (coarse granularity) of the secondary cyclone classification, and enters a secondary cyclone for regrinding after ore grinding;
6. the overflow (fine granularity) of the two-stage cyclone classification enters a concentration cyclone for primary concentration;
7. the underflow (high concentration) concentrated by the concentrating cyclone enters a filter for filtering;
8. the overflow (low concentration) concentrated by the concentration cyclone enters a high-efficiency thickener for secondary concentration;
9. the underflow (high concentration) concentrated by the high-efficiency thickener enters the filter for filtration, and the concentration of the overflow water of the thickener is required to be less than 500 mg/L, so that the condition of recycling is achieved.
The process adopts the design idea of pre-screening and pre-grading, reduces the grinding amount of the ball mill, improves the grading efficiency of the cyclone, and reduces the overgrinding phenomenon of oxidized ore; the process also adopts a concentration process of cyclone and thickener fractional concentration, and the concentration equipment can adopt relatively small equipment, continuous operation, high concentration efficiency and relatively low investment.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An oxide ore dressing and fine grinding process is characterized by comprising the following steps:
returning the first underflow pulp to primary ball milling and regrinding to form a closed circuit;
performing two-stage cyclone classification on the first overflow ore pulp to obtain a second overflow ore pulp and a second underflow ore pulp;
returning the second underflow slurry to secondary ball milling and regrinding to form a closed circuit;
performing water conservancy rotational flow concentration on the second overflow ore pulp to obtain concentrated overflow ore pulp and concentrated bottom ore pulp, directly feeding the concentrated bottom ore pulp into a filter for filtering, and filtering to obtain dry ore powder;
or, the concentrated overflow ore pulp enters a thickener for secondary concentration, and the concentrated overflow ore pulp also enters a filter for filtration to obtain dry ore powder after filtration.
2. An oxide ore dressing and fine grinding process according to claim 1, wherein the particle size of the undersize ore is less than or equal to 1 mm.
3. An oxide ore dressing and fine grinding process according to claim 1, wherein the grain size of the first grinding ore is less than or equal to 150 um.
4. An oxide ore dressing and fine grinding process according to claim 1, wherein the grain size of the second grinding ore is less than or equal to 75 um.
5. An oxide ore dressing and fine grinding process according to claim 1, wherein the fine grinding process further comprises: and circularly carrying out ball milling and cyclone classification on the second underflow ore pulp until the concentration of the underflow ore pulp obtained by cyclone classification is more than 55%.
6. An oxide ore dressing and fine grinding system used for matching with the oxide ore dressing and fine grinding process of any one of claims 1 to 5, which is characterized by comprising the following components:
7. a finely ground ore powder for oxide ore beneficiation produced by the fine grinding process according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010293777.7A CN111437972A (en) | 2020-04-15 | 2020-04-15 | Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010293777.7A CN111437972A (en) | 2020-04-15 | 2020-04-15 | Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder |
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| Publication Number | Publication Date |
|---|---|
| CN111437972A true CN111437972A (en) | 2020-07-24 |
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| CN202010293777.7A Pending CN111437972A (en) | 2020-04-15 | 2020-04-15 | Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849856A (en) * | 2022-04-07 | 2022-08-05 | 首钢京唐钢铁联合有限责任公司 | Production method for fine grinding of return ores of blast furnace |
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| CN106362860A (en) * | 2016-08-31 | 2017-02-01 | 安徽纽亚达科技有限责任公司 | Processing method of mica iron oxide |
| CN108144742A (en) * | 2016-12-05 | 2018-06-12 | 辽宁首钢硼铁有限责任公司 | A kind of closed circuit grinding method using combined and staged mode |
| CN109046753A (en) * | 2018-08-31 | 2018-12-21 | 中冶北方（大连）工程技术有限公司 | A kind of high mud viscosity earth's surface is red, magnetic mixing iron ore beneficiation technique |
| CN109865588A (en) * | 2019-04-12 | 2019-06-11 | 中冶北方（大连）工程技术有限公司 | A kind of transition zone mixing iron ore beneficiation technique |
| CN110479467A (en) * | 2019-08-28 | 2019-11-22 | 马钢集团设计研究院有限责任公司 | A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone |
| CN110898958A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Mineral processing technology for treating high-iron carbonate lean magnetic hematite mixed iron ore |
-
2020
- 2020-04-15 CN CN202010293777.7A patent/CN111437972A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106362860A (en) * | 2016-08-31 | 2017-02-01 | 安徽纽亚达科技有限责任公司 | Processing method of mica iron oxide |
| CN108144742A (en) * | 2016-12-05 | 2018-06-12 | 辽宁首钢硼铁有限责任公司 | A kind of closed circuit grinding method using combined and staged mode |
| CN109046753A (en) * | 2018-08-31 | 2018-12-21 | 中冶北方（大连）工程技术有限公司 | A kind of high mud viscosity earth's surface is red, magnetic mixing iron ore beneficiation technique |
| CN109865588A (en) * | 2019-04-12 | 2019-06-11 | 中冶北方（大连）工程技术有限公司 | A kind of transition zone mixing iron ore beneficiation technique |
| CN110479467A (en) * | 2019-08-28 | 2019-11-22 | 马钢集团设计研究院有限责任公司 | A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone |
| CN110898958A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Mineral processing technology for treating high-iron carbonate lean magnetic hematite mixed iron ore |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849856A (en) * | 2022-04-07 | 2022-08-05 | 首钢京唐钢铁联合有限责任公司 | Production method for fine grinding of return ores of blast furnace |
| CN114849856B (en) * | 2022-04-07 | 2024-07-30 | 首钢京唐钢铁联合有限责任公司 | A production method for fine grinding of blast furnace return ore |
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Application publication date: 20200724 |