CN114618635A - Dry grinding and dry separation process of magnetic iron ore - Google Patents
Dry grinding and dry separation process of magnetic iron ore Download PDFInfo
- Publication number
- CN114618635A CN114618635A CN202210312575.1A CN202210312575A CN114618635A CN 114618635 A CN114618635 A CN 114618635A CN 202210312575 A CN202210312575 A CN 202210312575A CN 114618635 A CN114618635 A CN 114618635A
- Authority
- CN
- China
- Prior art keywords
- wind power
- dry
- magnetic
- separation process
- separator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
-
- 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
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- 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
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
- B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
Abstract
The application relates to the technical field of magnetite processing, and discloses a dry grinding and dry separation process for magnetic iron ore, which comprises the following steps: step 1, carrying out high-pressure roller milling on raw ores; step 2, simultaneously sorting by wind power and magnetic force, wherein the parameters are as follows: the wind speed is 8-22 m/s; the magnetic separation parameter is 800-4000 GS; and 3, producing coarse concentrate. The magnetite of any grade is ground to the bottom through the high-pressure roller mill, and the grade of the rough concentrate obtained by simultaneously carrying out separation on the magnetite by wind power and magnetic force can reach more than 50 grades.
Description
Technical Field
The invention relates to the technical field of magnetite processing, in particular to a dry grinding and dry separation process of magnetic iron ore.
Background
At present, for the mining of medium and low grade magnetic iron ore, the working procedures of crushing, grinding, screening and grading, magnetic separation, tailing discharging and the like are required, after the raw ore is crushed and ground, the raw ore simultaneously has ores, rocks or ore and rock mixtures with different grain sizes, the traditional grading mode is that a vibrating screen is used for screening, the vibrating screen is limited by a screen mesh, the ores, the rocks or the ore and rock mixtures with different grain sizes are respectively distinguished, the rock and ore mixture with coarse grain size is ground again, the ore and the rock which are screened out to be fine grain are magnetically separated, the screen mesh with different mesh sizes is used for screening, and the screen mesh is very fine; the smaller the sieve pore is, the softer the sieve is, the less wear-resistant the sieve is, and the service life of the sieve is short; the other to vital point is that the smaller the sieve pore, the more difficult the sieve and the easier the screen pasting, the lower the sieving efficiency, the poorer the sieving effect and the higher the energy consumption. The minimum screen hole of a vibrating screen in common knowledge large-scale industrial application is 3mm, the vibrating screen is mature equipment, the screen hole is smaller than 3mm, the large-scale industrial application is not mature, the requirement of dry separation concentrate grade is met, the granularity is required to be below 0.30, the content below 0.074mm is required to be 50% -95%, the screened rough concentrate can only reach 30 grade, the grade of the rough concentrate screened by lean iron ore is lower, and the energy consumption and the high cost are high.
Disclosure of Invention
The invention aims to provide a dry grinding and dry separation process of magnetic iron ore, which aims to solve the problem of low grade of rough concentrate produced by the magnetic iron ore.
In order to achieve the aim, the invention provides a dry grinding and dry separation process of magnetic iron ore, which is characterized by comprising the following steps:
step 1, carrying out high-pressure roller milling on raw ores;
step 2, simultaneously sorting by wind power and magnetic force, wherein the parameters are as follows: the wind speed is 8-22 m/s; the magnetic separation parameter is 800 GS-4000 GS;
and 3, producing coarse concentrate.
And 2, for multi-level separation, simultaneously separating by using multi-level wind power and multi-level magnetic force to produce ores with different grain diameters.
In order to improve the yield of the rough concentrate, step 2, the produced rough middlings are subjected to high-pressure roller grinding repeatedly through multi-stage wind power and multi-stage magnetic force to form closed circuit grinding.
In order to avoid repeated roller grinding of the waste tailings, energy waste is avoided, and the ore production efficiency is low, step 2, coarse tailings are produced through simultaneous separation by multistage wind power and multistage magnetic force.
In order to separate iron minerals and gangue with dissociation granularity for magnetic separation, multi-stage wind separation is also arranged before the separation of wind power and magnetic force.
Preferably, the simultaneous separation of wind power and magnetic force adopts a wind power magnetic separator, and a high-pressure roller mill is adopted for high-pressure roller milling.
Preferably, the multi-stage wind power separation adopts a coarse grain wind power separator I, a medium grain wind power separator II and a micro powder wind power separator III.
Preferably, in order to screen out ferromagnetic objects, a wind power magnetic separator is adopted for simultaneously sorting by wind power and magnetic force.
Further, the ore sequentially enters a coarse grain wind power separator I, a medium grain wind power separator II, a micro powder wind power separator III and a wind power magnetic separator, and the minerals which are not separated by the coarse grain wind power separator I return to the high-pressure roller mill.
Preferably, the high-pressure roller mill comprises a roller shaft and a base body, wherein the base body is provided with closely-arranged lugs, the lugs are continuously formed along the axial direction of the roller, and the lugs are made of high-wear-resistance hard alloy.
The invention has the beneficial effects that:
1. the magnetite of any grade is ground to the bottom through a high-pressure roller mill, and the grade of coarse concentrate obtained by separating the magnetite of any grade simultaneously through wind power and magnetic force can reach more than 50 grades, such as low-grade ores of lean magnetite ore, ultra-lean magnetite ore, waste tailings and the like;
2. the coarse middling does not contain ores larger than 0.3mm, the enrichment ratio of the coarse middling is improved, coarse concentrate is produced after repeated high-pressure roller milling, iron minerals and gangue are not dissociated, and excessive impurities in subsequent smelting are avoided;
3. in the traditional ore dressing mode, about 10 percent of small-particle-size ores can be carried by large-particle-size ores to be subjected to secondary roller grinding in the sieving process of a sieve, over grinding is easily caused, and a roller grinder repeatedly applies work to the ores.
Drawings
FIG. 1 is a process flow diagram of example 1;
FIG. 2 is a process flow diagram of example 2.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and modifications made to the invention without departing from the principle of the invention fall within the scope of the claims of the present invention.
The invention provides a dry grinding and dry separation process of magnetic iron ore, which is characterized in that raw ore is fed into a high-pressure roller mill for high-pressure roller grinding, and then is separated by wind power and magnetic force at the same time, wherein the wind speed is 8-22 m/s; the magnetic separation parameter is 800 GS-4000 GS; and (6) producing coarse concentrate.
Example 1
As shown in fig. 1, in the dry grinding and dry separation process of the magnetic iron ore, step 1, lean magnetic iron ore is fed into a high-pressure roller mill to be subjected to high-pressure roller milling treatment; step 2, sending the mixture into a wind magnetic separator for simultaneous separation of wind power and magnetic force, wherein the wind speed is 12 m/s; magnetic separation parameters are 1500 GS; and 3, producing rough concentrate with TFe grade of 50%. And (3) selecting 500 GS-4000 GS according to the mineral selectivity and the requirements on tailings discarding and concentrate grade by using the magnetic field intensity of the wind power magnetic separator. The rough concentration magnetic field intensity needs to be selected to be high if the grade of the tailing discarding magnetic iron is required to be low; the concentrate grade is required to be high, and the concentration magnetic field intensity is required to be low.
The high-pressure roller mill comprises a roller shaft and a base body, wherein the base body is provided with closely-arranged lugs, the lugs are continuously formed along the axial direction of the roller, the lugs are made of high-wear-resistance hard alloy, and the roller adopts a roller disclosed in the document 201410376414.4.
In order to sort ores with different particle sizes in a multi-level mode and facilitate recycling or selecting waste ores, the wind magnetic separator adopts three-level wind power and three-level magnetic force to sort at the same time, the wind speed of the first level is 8m/s, the wind speed of the second level is 16m/s, the wind speed of the third level is 21m/s, the magnetic force of the first level is 4000GS, the magnetic force of the second level is 1500GS, the magnetic force of the third level is 800GS, coarse concentrate, coarse tailings and coarse middlings are sorted out, the wind magnetic separator can not only sort 0-0.1 mm granularity minerals in advance, but also is suitable for sorting 0-20 mm and 0-0.5 mm granularity, wind classification is adopted to control the granularity, magnetic classification is adopted, the granularity is not seen, only the magnetic force is seen, the separation of useful matters and useless matters is controlled by the magnetic force, and the wind magnetic separator can be arranged into a multi-level magnetic roller assembly structure, for example: two-stage separation, three-stage separation, four-stage separation and the like, and high-quality and high-grade concentrate can be obtained very easily just because of wind power, gravity, magnetic force, magnetic factor force, centrifugal force and multi-stage separation processes.
The working principle of the wind-power magnetic separator is that wind is used as a medium, the separation is carried out under the combined action of multiple force fields such as wind power, magnetic force, gravity, centrifugal force, magnetic factor force mechanical force and the like, and multi-level wind-power magnetic separation can be set according to the properties of minerals, so that real concentrate can be selected from fine-grained and micron-sized materials.
In order to improve the utilization rate of the coarse middlings, the coarse middlings are repeatedly subjected to high-pressure roller milling and then separated by a wind magnetic separator to form closed-circuit milled ores.
Example 2
The difference is that, based on the example 1, as shown in fig. 2, after the raw ore is subjected to the high pressure roll milling in the step 1; step 2, carrying out tertiary air separation; step 3, simultaneously sorting by wind power and magnetic force in a wind power magnetic separator; and 4, producing coarse concentrate, coarse middling and coarse tailings.
And the third wind separation respectively adopts a coarse grain wind separator I, a medium grain wind separator II and a micro powder wind separator III, and iron minerals and gangue with the cleavage granularity are separated for magnetic separation.
The ore sequentially enters a coarse grain wind separator I, a medium grain wind separator II, a micro powder wind separator III and a wind magnetic separator, the minerals which are not separated by the coarse grain wind separator I return to a roller press, the iron minerals and the gangue which reach the dissociation granularity are separated and supplied to the wind magnetic separator for separation, the ferromagnetic materials and the gangue are separated by the wind magnetic separator, and the iron grade can reach 60% -68%.
Claims (10)
1. The dry grinding and dry separation process of the magnetic iron ore is characterized by comprising the following steps of:
step 1, carrying out high-pressure roller milling on raw ores;
step 2, simultaneously sorting by wind power and magnetic force, wherein the parameters are as follows: the wind speed is 8-22 m/s; the magnetic separation parameter is 800 GS-4000 GS;
and 3, producing coarse concentrate.
2. The dry grinding and dry separation process of the magnetite according to claim 1, characterized in that: and 2, simultaneously sorting by using multi-stage wind power and multi-stage magnetic force to produce ores with different grain diameters.
3. The dry grinding and dry separation process of magnetic iron ore according to claim 1 or 2, characterized in that: and 2, simultaneously sorting the produced coarse middling by multi-stage wind power and multi-stage magnetic force, and repeatedly carrying out high-pressure roller grinding on the produced coarse middling to form closed circuit grinding ore.
4. The dry grinding and dry separation process of magnetic iron ore according to claim 1 or 2, characterized in that: and 2, simultaneously sorting by multi-stage wind power and multi-stage magnetic force to produce coarse tailings.
5. The dry grinding and dry separation process of the magnetite according to claim 3, characterized in that: and 2, simultaneously sorting by multi-stage wind power and multi-stage magnetic force to produce coarse tailings.
6. The dry grinding and dry separation process of magnetic iron ore according to any one of claims 1 to 5, characterized in that: and multi-stage wind power separation is also arranged before the simultaneous separation of wind power and magnetic force.
7. The dry grinding and dry separation process of the magnetite according to claim 6, characterized in that: the wind power and the magnetic force are simultaneously selected by a wind power magnetic separator, and a high-pressure roller mill is used for high-pressure roller milling.
8. The dry grinding and dry separation process of the magnetite according to claim 7, characterized in that: the multi-stage wind power separation adopts a coarse grain wind power separator I, a medium grain wind power separator II and a micro powder wind power separator III.
9. The dry grinding and dry separation process of the magnetite according to claim 8, characterized in that: the ore sequentially enters a coarse grain wind power separator I, a medium grain wind power separator II, a micro powder wind power separator III and a wind power magnetic separator, and the minerals which are not separated by the coarse grain wind power separator I return to the high-pressure roller mill.
10. The dry grinding and dry separation process of the magnetite according to claim 9, characterized in that: the high-pressure roller mill comprises a roller shaft and a base body, wherein the base body is provided with lugs which are closely arranged, the lugs are continuously formed along the axial direction of the roller, and the lugs are made of high-wear-resistant hard alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210312575.1A CN114618635A (en) | 2022-03-28 | 2022-03-28 | Dry grinding and dry separation process of magnetic iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210312575.1A CN114618635A (en) | 2022-03-28 | 2022-03-28 | Dry grinding and dry separation process of magnetic iron ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114618635A true CN114618635A (en) | 2022-06-14 |
Family
ID=81903388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210312575.1A Pending CN114618635A (en) | 2022-03-28 | 2022-03-28 | Dry grinding and dry separation process of magnetic iron ore |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114618635A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553709A (en) * | 2012-01-16 | 2012-07-11 | 西安三沅重工有限责任公司 | Magnetite roller mill dry separation method |
| CN102600923A (en) * | 2012-03-12 | 2012-07-25 | 成都利君实业股份有限公司 | Magnetite finish grinding system and grinding method thereof |
| CN103041906A (en) * | 2013-01-03 | 2013-04-17 | 湖南三泓建材有限公司 | Slag micropowder grinding system and technology |
| CN104084259A (en) * | 2014-08-01 | 2014-10-08 | 张珂 | Roller and rolling device thereof |
| CN104772212A (en) * | 2015-02-15 | 2015-07-15 | 胡沿东 | Separation system |
| CN205020200U (en) * | 2015-09-10 | 2016-02-10 | 中信重工机械股份有限公司 | Poor value is grading system of usefulness in grades |
| CN105772218A (en) * | 2016-03-22 | 2016-07-20 | 薛鹏飞 | Iron ore circulating classification beneficiation method and dry beneficiation machine applied to method |
| CN105983475A (en) * | 2016-02-19 | 2016-10-05 | 中建材（合肥）粉体科技装备有限公司 | High-pressure roller mill crushing system for magnetite and mineral dressing method of high-pressure roller mill crushing system |
| CN108380380A (en) * | 2018-03-29 | 2018-08-10 | 安徽马钢张庄矿业有限责任公司 | Product dry type fine crushing sorts Iron concentrate technique |
| CN110449246A (en) * | 2019-08-09 | 2019-11-15 | 成都利君实业股份有限公司 | A kind of pair of mineral carry out selective milling, the method for sorting and implementation equipment |
| CN211678135U (en) * | 2019-12-10 | 2020-10-16 | 成都利君实业股份有限公司 | Magnetic ore dry grinding and sorting system |
| CN214812686U (en) * | 2021-05-28 | 2021-11-23 | 重庆京庆重型机械股份有限公司 | Ore dry method grading plant |
-
2022
- 2022-03-28 CN CN202210312575.1A patent/CN114618635A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553709A (en) * | 2012-01-16 | 2012-07-11 | 西安三沅重工有限责任公司 | Magnetite roller mill dry separation method |
| CN102600923A (en) * | 2012-03-12 | 2012-07-25 | 成都利君实业股份有限公司 | Magnetite finish grinding system and grinding method thereof |
| CN103041906A (en) * | 2013-01-03 | 2013-04-17 | 湖南三泓建材有限公司 | Slag micropowder grinding system and technology |
| CN104084259A (en) * | 2014-08-01 | 2014-10-08 | 张珂 | Roller and rolling device thereof |
| CN104772212A (en) * | 2015-02-15 | 2015-07-15 | 胡沿东 | Separation system |
| CN205020200U (en) * | 2015-09-10 | 2016-02-10 | 中信重工机械股份有限公司 | Poor value is grading system of usefulness in grades |
| CN105983475A (en) * | 2016-02-19 | 2016-10-05 | 中建材（合肥）粉体科技装备有限公司 | High-pressure roller mill crushing system for magnetite and mineral dressing method of high-pressure roller mill crushing system |
| CN105772218A (en) * | 2016-03-22 | 2016-07-20 | 薛鹏飞 | Iron ore circulating classification beneficiation method and dry beneficiation machine applied to method |
| CN108380380A (en) * | 2018-03-29 | 2018-08-10 | 安徽马钢张庄矿业有限责任公司 | Product dry type fine crushing sorts Iron concentrate technique |
| CN110449246A (en) * | 2019-08-09 | 2019-11-15 | 成都利君实业股份有限公司 | A kind of pair of mineral carry out selective milling, the method for sorting and implementation equipment |
| CN211678135U (en) * | 2019-12-10 | 2020-10-16 | 成都利君实业股份有限公司 | Magnetic ore dry grinding and sorting system |
| CN214812686U (en) * | 2021-05-28 | 2021-11-23 | 重庆京庆重型机械股份有限公司 | Ore dry method grading plant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105855019B (en) | Ultrafine crushing-grading magnetic separation method for magnetite | |
| CN108014913B (en) | Ultra-lean magnetite beneficiation method and system for associated phosphorus minerals | |
| CN1911523A (en) | Technological method capable of enhancing ore dressing efficiency and ore dressing indox | |
| CN101757982A (en) | Coal slime floating process | |
| CN1943869A (en) | Step branched ore milling and milling and dressing circular new technology | |
| CN110624686A (en) | Magnetite beneficiation process capable of fully releasing mill capacity | |
| CN111686926A (en) | Rough and fine separation-magnetism-weight-floatation combined process for treating magnetite | |
| CN114247555A (en) | Crushing and grinding magnetic separation treatment process for iron ore | |
| CN105944833A (en) | Process for stage grinding-tower milling-magnetic vibrating machine separating lean magnetite ores | |
| CN109482333B (en) | Dry-wet combined enrichment process for copper ore | |
| CN111375482B (en) | Method for grading and sorting silico-calcic phosphate ore | |
| CN104096627B (en) | The method of the black tungsten beneficiating efficiency of a kind of effective raising | |
| CN113856890B (en) | Resource comprehensive utilization system and method for gold ore associated minerals | |
| CN114178045B (en) | Simple beneficiation method for chalcocite-containing coarse-grain embedded copper sulfide ore | |
| CN115430517A (en) | Anshan type maghemite sectional grinding, heavy-magnetic process flow | |
| CN114618635A (en) | Dry grinding and dry separation process of magnetic iron ore | |
| CN114082522A (en) | Heavy medium beneficiation and color beneficiation combined beneficiation process for collophanite | |
| CN114405675A (en) | Ore dressing process for iron ore mixed ore | |
| CN111375485B (en) | Phosphate ore washing and grading separation method | |
| CN112076885A (en) | Enrichment process of coal-series kaolin in coal gangue | |
| CN111250245A (en) | Microwave pretreatment and mechanical combined crushing method for metal ores | |
| CN115382649B (en) | Ilmenite separation method | |
| WO2024045687A2 (en) | Method for pre-selection and discarding and reducing over-grinding of gold ores | |
| CN114602629B (en) | Efficient method for magnetic ore full-size-fraction preselection | |
| CN114130523B (en) | Preselection process of high-mud hematite ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |