CN110624686A - Magnetite beneficiation process capable of fully releasing mill capacity - Google Patents
Magnetite beneficiation process capable of fully releasing mill capacity Download PDFInfo
- Publication number
- CN110624686A CN110624686A CN201910828968.6A CN201910828968A CN110624686A CN 110624686 A CN110624686 A CN 110624686A CN 201910828968 A CN201910828968 A CN 201910828968A CN 110624686 A CN110624686 A CN 110624686A
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- China
- Prior art keywords
- tailings
- magnetic
- concentrate
- feeding
- separation
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- 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.)
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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
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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
- 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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- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
Abstract
The invention relates to a magnetite beneficiation process capable of fully releasing mill capacity. The method comprises the steps of crushing raw ores in a three-stage mode, performing secondary dry separation, performing superfine crushing by using a high-pressure roller mill, screening the high-pressure roller mill product by using screening equipment, feeding the screened product into a wet-type preselection magnetic separator, grinding, grading, magnetic separating and reselecting wet-type preselection rough concentrate to obtain partial qualified concentrate, feeding tailings in a reselection process into a second-stage grinding after concentration and magnetic separation, and performing magnetic separating, fine screening, grading, elutriation and selection on the second-stage ground product to obtain the qualified concentrate. According to the invention, a large amount of qualified tailings can be thrown out by performing wet preselection on the high-pressure roller mill product, so that the grinding amount is reduced, and the ore grinding cost and energy consumption are reduced; the magnetic gravity combined separation process can fully utilize the density difference of iron minerals and poor intergrowth to recover part of qualified concentrate in advance; the whole process can fully release the mill capability, save energy and reduce consumption, and compared with the conventional process, the effective volume of the ball mill can be reduced to below 50 percent, thereby greatly reducing investment and production cost.
Description
Technical Field
The invention relates to the technical field of beneficiation, in particular to a magnetite beneficiation process capable of fully releasing mill capacity.
Background
In the mineral separation production, ball milling is the most key link of the whole mineral separation process flow, the grinding operation accounts for a large proportion in the capital investment and the production cost of a mineral separation plant, and the running condition of the ball mill has great influence on the economic and technical indexes of the whole mineral separation plant, so that the ball mill also has important influence on the production capacity and the economic benefit of the mineral separation plant. Therefore, how to release the capacity of the ball mill to the maximum extent directly relates to the technical indexes and economic benefits of enterprises.
At present, magnetite process flows are mostly three-section one-closed-circuit crushing, stage ore grinding and stage magnetic separation flows, although good technical indexes can be obtained in the flows, the release of mill capacity is not fully considered, firstly, a dry magnetic separator is widely applied in the field of magnetite as pre-selection tailing discarding equipment before grinding, but the effect of bulk dry separation tailing discarding is far less than that of fine particles and the effect of pre-tailing discarding is good; secondly, a single magnetic separation process is difficult to well separate iron minerals and poor intergrowths with wide particle size ranges, and meanwhile, the cyclone or the fine screen serving as grading equipment can cause oversize products or part of qualified products in sand setting of the cyclone to return to a second-stage grinding machine for regrinding, so that the burden of the grinding machine can be further increased, and the treatment capacity of the whole process is reduced.
Disclosure of Invention
The invention aims to solve the problems, and provides a magnetite beneficiation process for fully releasing mill capacity, which realizes the full release of the capacity of a ball mill by discarding a large amount of tailings before grinding, reasonably discarding tailings in a grading process and pre-extracting concentrate, thereby obtaining good technical indexes and economic benefits.
The invention solves the problems and adopts the technical scheme that:
a magnetite beneficiation process for fully releasing mill capacity comprises the following steps:
firstly, raw ore is fed into coarse crushing, coarse crushing products enter into medium crushing, and the medium crushing is subjected to primary dry separation after being screened;
(II) fine crushing the primary dry separation concentrate, performing secondary dry separation on the fine crushed product, and combining the primary dry separation tailings and the secondary dry separation tailings to obtain a waste stone product;
(III) feeding the secondary dry separation concentrate into a high-pressure roller mill, screening the high-pressure roller mill product by using screening equipment, feeding the screened product into a wet type pre-selection magnetic separator, and returning the screened product to the high-pressure roller mill;
(IV) feeding the concentrate of the preselection magnetic separator into a primary grinding machine;
(V) feeding the primary ground ore product into a primary grading device for grading, returning the graded settled sand to the primary grinding machine for regrinding, and feeding the graded overflow into primary magnetic separation;
sixthly, feeding magnetic concentrate into a gravity separation flow for separation, and taking magnetic tailings as final tailings;
(seventhly), reselecting the process concentrate to form final concentrate, and feeding the reselected process tailings into concentration magnetic separation;
(VIII) feeding the concentrated magnetic separation concentrate into secondary grinding, and concentrating the magnetic separation tailings to obtain final tailings;
(ninthly), carrying out secondary magnetic separation on the secondary ground ore product, demagnetizing the secondary magnetic concentrate, and feeding the demagnetized secondary magnetic concentrate into a fine sieve to obtain secondary magnetic tailings as final tailings;
(ten) feeding the product below the fine screen into an elutriation machine, and returning the product above the fine screen to concentration and magnetic separation;
and (eleventh), the underflow of the elutriator becomes final concentrate, and the overflow of the elutriator is used as ore feeding water of a preselecting magnetic separator to return to the original flow.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
after the process flow is adopted, the grinding particle size is controlled to be less than 3-5mm by using the high-pressure roller mill, the grinding particle size can be reduced, a large amount of coarse-grained tailings can be thrown out after wet preselection of a high-pressure roller mill product, the grinding amount is reduced, the mill capacity is fully released, and the process treatment capacity is greatly improved. Meanwhile, the pre-selected coarse tailings can be used as building materials and do not enter a tailing pond, so that the service life of the tailing pond is prolonged.
Secondly, after the process flow is adopted, the tailings can be discarded in advance by utilizing the gravity separation flow, the concentrate is pre-extracted, the ore amount entering a secondary grinding machine is reduced, meanwhile, the problem that the existing low-intensity magnetic separation equipment is difficult to well separate iron minerals with wider particle size range from poor intergrowth is solved, and the purposes of throwing early and harvesting early are realized.
After the technological process is adopted, compared with the conventional process, the effective volume of the ball mill can be reduced to below 50 percent, and the investment and the production cost can be greatly reduced.
Preferably, the further technical scheme of the invention is as follows:
and (IV) separating coarse-grained tailings from tailings of the magnetic separator in a pre-selection mode to serve as building materials, and fine-grained tailings serving as final tailings.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
The specific implementation mode is as follows:
the invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Referring to fig. 1, a magnetite beneficiation process to fully release mill capacity, comprising the steps of:
firstly, raw ore is fed into coarse crushing, coarse crushing products enter into medium crushing, and the medium crushing is screened and then subjected to primary dry separation.
And (II) fine crushing the primary dry separation concentrate, performing secondary dry separation on the fine crushed product, and combining the primary dry separation tailings and the secondary dry separation tailings to obtain a waste stone product.
And (III) feeding the secondary dry separation concentrate into a high-pressure roller mill, screening the high-pressure roller mill product by using 3-5mm screening equipment, feeding the screened product into a wet pre-selection magnetic separator, and returning the screened product to the high-pressure roller mill.
And (IV) feeding the concentrate of the pre-concentration magnetic separator into a primary grinding machine, wherein part of coarse-grained tailings can be separated from the tailings of the pre-concentration magnetic separator to be used as building materials, and the fine-grained part can be used as final tailings.
And (V) feeding the primary ground ore product into a primary grading device for grading, returning the graded settled sand to the primary grinding device for regrinding, and feeding the graded overflow into primary magnetic separation.
And (VI) feeding magnetic concentrate into a reselection flow (the reselection flow can be reasonably configured according to the properties of the ore and the actual situation on site) for sorting, and taking magnetic tailings as final tailings.
And (seventhly), reselecting the process concentrate to form final concentrate, and feeding the reselected process tailings into concentration magnetic separation.
And (eighthly), feeding the concentrated magnetic separation concentrate into a second-stage grinding, and concentrating the magnetic separation tailings to obtain final tailings.
And (ninthly), carrying out secondary magnetic separation on the secondary ground ore product, demagnetizing the secondary magnetic separation concentrate, feeding the demagnetized secondary magnetic separation concentrate into a fine sieve, and making the secondary magnetic separation tailings into final tailings.
(ten) feeding the product below the fine screen into an elutriation machine, and returning the product above the fine screen to concentration and magnetic separation.
And (eleventh), the underflow of the elutriator becomes final concentrate, and the overflow of the elutriator is used as ore feeding water of a preselecting magnetic separator to return to the original flow.
The method comprises the steps of carrying out three-stage crushing and secondary dry separation on raw ores, carrying out superfine crushing by using a high-pressure roller mill, screening the high-pressure roller mill product by using 3-5mm screening equipment, feeding the screened product into a wet preselection magnetic separator, carrying out ore grinding, grading, magnetic separation and gravity separation on wet preselection rough concentrate to obtain part of qualified concentrate, carrying out concentration and magnetic separation on the concentrate in a gravity separation process, feeding the concentrate into a second-stage ore grinding, and carrying out magnetic separation, fine screening, grading, elutriation and concentration on the second-stage ore grinding product to obtain qualified concentrate; the grinding particle size is controlled to be less than 3-5mm by using the high-pressure roller mill, the grinding particle size can be reduced, a large amount of coarse-grained tailings can be thrown out after wet preselection of a high-pressure roller mill product, the grinding amount is reduced, the mill capacity is fully released, and the flow processing capacity is greatly improved; meanwhile, the pre-selected coarse-grained tailings can be used as building materials and do not enter a tailing pond, so that the service life of the tailing pond is prolonged; after the process flow is adopted, the tailings can be thrown ahead of time by utilizing the gravity separation flow, the concentrate is pre-extracted, the ore amount entering a two-stage mill is reduced, the problem that the existing low-intensity magnetic separation equipment is difficult to well separate iron minerals with wider particle size range from poor intergrowth is solved, and the purposes of throwing early and harvesting early are realized; after the process flow is adopted, compared with the conventional flow, the effective volume of the ball mill can be reduced to below 50 percent, and the investment and the production cost can be greatly reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (2)
1. A magnetite beneficiation process for fully releasing mill capacity is characterized by comprising the following steps:
firstly, raw ore is fed into coarse crushing, coarse crushing products enter into medium crushing, and the medium crushing is subjected to primary dry separation after being screened;
(II) fine crushing the primary dry separation concentrate, performing secondary dry separation on the fine crushed product, and combining the primary dry separation tailings and the secondary dry separation tailings to obtain a waste stone product;
(III) feeding the secondary dry separation concentrate into a high-pressure roller mill, screening the high-pressure roller mill product by using screening equipment, feeding the screened product into a wet type pre-selection magnetic separator, and returning the screened product to the high-pressure roller mill;
(IV) feeding the concentrate of the preselection magnetic separator into a primary grinding machine;
(V) feeding the primary ground ore product into a primary grading device for grading, returning the graded settled sand to the primary grinding machine for regrinding, and feeding the graded overflow into primary magnetic separation;
sixthly, feeding magnetic concentrate into a gravity separation flow for separation, and taking magnetic tailings as final tailings;
(seventhly), reselecting the process concentrate to form final concentrate, and feeding the reselected process tailings into concentration magnetic separation;
(VIII) feeding the concentrated magnetic separation concentrate into secondary grinding, and concentrating the magnetic separation tailings to obtain final tailings;
(ninthly), carrying out secondary magnetic separation on the secondary ground ore product, demagnetizing the secondary magnetic concentrate, and feeding the demagnetized secondary magnetic concentrate into a fine sieve to obtain secondary magnetic tailings as final tailings;
(ten) feeding the product below the fine screen into an elutriation machine, and returning the product above the fine screen to concentration and magnetic separation;
and (eleventh), the underflow of the elutriator becomes final concentrate, and the overflow of the elutriator is used as ore feeding water of a preselecting magnetic separator to return to the original flow.
2. A magnetite beneficiation process to substantially free mill capacity according to claim 1, characterised in that: and (IV) separating coarse-grained tailings from tailings of the magnetic separator in a pre-selection mode to serve as building materials, and fine-grained tailings serving as final tailings.
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| CN201910828968.6A CN110624686A (en) | 2019-09-03 | 2019-09-03 | Magnetite beneficiation process capable of fully releasing mill capacity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112718194A (en) * | 2020-12-16 | 2021-04-30 | 安徽新建矿业工程技术有限责任公司 | Magnetite series high-pressure roller grinding and combined tail polishing energy-saving crushing method |
| CN113070151A (en) * | 2021-03-18 | 2021-07-06 | 沈阳盛世五寰科技有限公司 | Crushing and grading process for reducing processing cost of magnetic ore |
| CN113385299A (en) * | 2021-05-28 | 2021-09-14 | 鞍钢集团矿业有限公司 | Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore |
| CN113634365A (en) * | 2021-07-27 | 2021-11-12 | 包钢集团矿山研究院（有限责任公司） | Process for recycling iron resources from refuse dump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112718194A (en) * | 2020-12-16 | 2021-04-30 | 安徽新建矿业工程技术有限责任公司 | Magnetite series high-pressure roller grinding and combined tail polishing energy-saving crushing method |
| CN113070151A (en) * | 2021-03-18 | 2021-07-06 | 沈阳盛世五寰科技有限公司 | Crushing and grading process for reducing processing cost of magnetic ore |
| CN113385299A (en) * | 2021-05-28 | 2021-09-14 | 鞍钢集团矿业有限公司 | Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore |
| CN113385299B (en) * | 2021-05-28 | 2022-06-14 | 鞍钢集团矿业有限公司 | Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore |
| CN113634365A (en) * | 2021-07-27 | 2021-11-12 | 包钢集团矿山研究院（有限责任公司） | Process for recycling iron resources from refuse dump |
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Application publication date: 20191231 |
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