CN113019658A - Magnetic separation-electric separation combined titanium separation method - Google Patents
Magnetic separation-electric separation combined titanium separation method Download PDFInfo
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- CN113019658A CN113019658A CN202110341717.2A CN202110341717A CN113019658A CN 113019658 A CN113019658 A CN 113019658A CN 202110341717 A CN202110341717 A CN 202110341717A CN 113019658 A CN113019658 A CN 113019658A
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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
- 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
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Abstract
The invention relates to a magnetic separation-electric separation combined titanium separation method, and belongs to the technical field of mineral separation. The invention aims to provide a titanium separation method of ilmenite, which combines magnetic separation and electric separation to obtain high-grade titanium concentrate. The method comprises the following steps: a. crushing: crushing ilmenite until the particle size of 20-50 mm accounts for 75-85% to obtain a crushed product; b. magnetic separation and tailing discarding: magnetically separating the crushed product under the magnetic field intensity of 280-320 kA/m to obtain waste rocks and a first concentrate; c. grinding: grinding the first concentrate to obtain a second concentrate with the particle size of 0.1-2 mm; d. electric selection: and feeding the concentrate II to an electric separator for electric separation to obtain titanium concentrate. The method combines the magnetic separation process and the electric separation process, greatly improves the mineral separation efficiency, has simple process flow, stability, reliability, strong applicability and small water consumption, is very suitable for mineral separation in arid areas, greatly improves the mineral separation efficiency and maximizes the titanium resource value.
Description
Technical Field
The invention relates to a magnetic separation-electric separation combined titanium separation method, and belongs to the technical field of mineral separation.
Background
Titanium is a strategic metal with excellent performance, and has the characteristics of high specific strength, strong corrosion resistance, good high-low temperature performance and the like, wherein the high specific strength performance is particularly outstanding. By virtue of the excellent performance of the titanium element, the titanium material is widely applied to the fields of chemical engineering, ocean engineering, aerospace, military, metallurgy, medical treatment, sports and leisure and the like.
Ilmenite, also known as titanomagnetite, is an oxide mineral of iron and titanium and is the main ore for the extraction of titanium. The reserves of ilmenite in China are abundant and mainly distributed in Hebei, Sichuan, Yunnan, Heilongjiang and other places, wherein the resource reserves are more than 90% in the Panxi area. The titanium concentrate is a raw material for producing titanium dioxide and titanium sponge, and with the continuous development of domestic economy, the demand of ilmenite concentrate is gradually increased, so that the development of ilmenite is enhanced. Because the titanium ore has low grade, complex mineral composition, and closer physical property to gangue mineral, and the mineral dressing industry of mine areas all over the country is different, more researches on the mineral dressing process flow of the ilmenite are needed.
At present, the beneficiation of titanium ore mainly adopts a method of 'stage grinding-stage magnetic separation' to recover ilmenite at present, and simultaneously adopts the combination of flotation, electric separation or gravity separation. For example, the invention patent with the application number of 202010656069.5 discloses a beneficiation method for producing titanium concentrate by using ilmenite, which comprises the following steps: the method comprises the following steps of rough concentration with strong magnetism → classification with grinding, selection with strong magnetism → flotation, and classification with grinding, wherein ferrotitanium concentrate after rough concentration with strong magnetism is used as raw ore, classification is carried out by a sieving machine, undersize enters strong magnetism selection, and oversize returns to a ball mill for ball milling, and the material after ball milling is conveyed to the feeding end of the sieving machine to form closed circulation of classification with grinding, and the method is characterized in that: the screen cloth of screening machine sets gradually into upper portion sieve subregion and lower part sieve subregion along its incline direction, and the upper end in upper portion sieve subregion is the feed end, and upper portion sieve subregion adopts the screen cloth that screening aperture is 0.15mm, and lower part sieve subregion adopts the screen cloth that screening aperture is 0.18 mm. The invention combines magnetic separation and flotation, and can obtain titanium concentrate, but needs a large amount of water resources.
The invention patent with application number 201710874223.4 discloses an ilmenite beneficiation method, which comprises the following steps: sorting ferrotitanium raw ores under a 0.4-1.2T magnetic field to obtain concentrate; carrying out primary coarse and fine classification on the concentrate according to the size fraction of 0.35-0.45 mm to obtain a primary fine-grained material, and carrying out iron removal to obtain iron concentrate and iron-removed tailings; carrying out two-stage coarse and fine classification on the iron-removed tailings according to the grain size of 0.1-0.15 mm to obtain two-stage fine-grained materials and two-stage coarse-grained materials; reselecting and electrically separating the second-stage coarse fraction material to obtain electrically separated titanium concentrate; and performing second-stage fine-fraction material flotation to obtain flotation titanium concentrate. Although the method can obtain the titanium concentrate with higher recovery rate and titanium grade, the titanium concentrate is the flotation titanium concentrate, the grade of the electro-flotation titanium concentrate is only 46.87% -48.24%, the recovery rate is only 7.54% -9.89%, and further improvement is needed.
Disclosure of Invention
Aiming at the defects, the technical problem to be solved by the invention is to provide a titanium separation method of ilmenite, which combines magnetic separation and electric separation to obtain high-grade titanium concentrate.
The invention relates to a magnetic separation-electric separation combined titanium separation method, which comprises the following steps:
a. crushing: crushing ilmenite until the particle size of 20-50 mm accounts for 75-85% to obtain a crushed product;
b. magnetic separation and tailing discarding: magnetically separating the crushed product under the magnetic field intensity of 280-320 kA/m to obtain waste rocks and a first concentrate;
c. grinding: grinding the first concentrate to obtain a second concentrate with the particle size of 0.1-2 mm;
d. electric selection: and feeding the concentrate II to an electric separator for electric separation to obtain titanium concentrate.
In a particular embodiment of the invention, the ilmenite is limonite or magnetite and the titanium grade in the ilmenite is between 28.47% and 34.59%.
In a specific embodiment of the invention, in step a, the crushing is performed by a jaw crusher.
In the step a, the ilmenite is crushed to 20-50 mm, wherein the proportion of the ilmenite is 80%.
In one embodiment of the present invention, in the step b, the magnetic separation is dry magnetic separation.
In a specific embodiment, in the step b, a permanent magnetic medium field intensity dry magnetic separator is adopted for the dry magnetic separation.
In a specific embodiment, in the step c, grinding is performed by using a roller type ultra-fine grinding machine.
In one embodiment of the invention, in step c, after grinding, the ore with a particle size >2mm is returned to the grinding mill for secondary grinding; and magnetically separating the minerals with the granularity of less than 0.1mm to obtain the magnetically separated titanium concentrate.
In one embodiment of the invention, the magnetic separation titanium concentrate is obtained by magnetic separation of minerals with the particle size of less than 0.1mm under the magnetic field intensity of 60-80 kA/m.
In one embodiment of the invention, in step d, the electric concentrator is a three-drum high-pressure concentrator.
In a specific embodiment of the invention, the grade of the titanium concentrate obtained in step d is 55-62%.
Compared with the prior art, the invention has the following beneficial effects:
the method combines the magnetic separation and the electric separation process, greatly improves the beneficiation efficiency, ensures that the grade of the obtained titanium concentrate is 55-62 percent, has the titanium recovery rate of 69-73 percent, has simple process flow, stability and reliability, strong applicability and small water consumption, is very suitable for beneficiation in arid areas, greatly improves the beneficiation efficiency and maximizes the titanium resource value.
Detailed Description
The invention relates to a magnetic separation-electric separation combined titanium separation method, which comprises the following steps:
a. crushing: crushing ilmenite until the particle size of 20-50 mm accounts for 75-85% to obtain a crushed product;
b. magnetic separation and tailing discarding: magnetically separating the crushed product under the magnetic field intensity of 280-320 kA/m to obtain waste rocks and a first concentrate;
c. grinding: grinding the first concentrate to obtain a second concentrate with the particle size of 0.1-2 mm;
d. electric selection: and feeding the concentrate II to an electric separator for electric separation to obtain titanium concentrate.
The method combines the magnetic separation process and the electric separation process, greatly improves the mineral separation efficiency, has simple process flow, stability, reliability, strong applicability and small water consumption, is very suitable for mineral separation in arid areas, greatly improves the mineral separation efficiency and maximizes the titanium resource value.
The method of the invention can be suitable for various ilmenite. In a particular embodiment of the invention, the ilmenite is limonite or magnetite and the titanium grade in the ilmenite is between 28.47% and 34.59%.
The steps of the method of the present invention are described in detail below.
Step a, crushing, namely crushing the ilmenite until the diameter of the ilmenite is 20-50 mm and the content of the ilmenite is 75-85%.
The crushing can be carried out by conventional methods in the art, and the crushing equipment can be equipment commonly used in the art, and in one embodiment of the invention, the crushing is carried out by a jaw crusher. The jaw crusher is commercially available.
In one embodiment of the invention, ilmenite is crushed to 20-50 mm, which accounts for 80%.
In the present invention, "%" represents weight percent unless otherwise specified.
And b, magnetic separation and tailing discarding, wherein the crushed product obtained in the step a is subjected to magnetic separation under the magnetic field intensity of 280-320 kA/m to obtain a first concentrate, and the obtained tailings are nonmetal waste rocks.
In one embodiment of the invention, the magnetic separation in the step b is dry magnetic separation.
Dry magnetic separation methods commonly used in the art are suitable for use in the present invention. In one embodiment, a permanent magnet medium field dry magnetic separator is used. The magnetic separator is commercially available.
And c, grinding the concentrate I to 0.1-2 mm, wherein the mineral meeting the granularity is the concentrate II.
The grinding may be carried out by conventional methods in the art, and in one embodiment, by a roller-type attritor. The roller type ultrafine mill is a conventional apparatus, and a commercially available one can be used.
In order to make full use of mineral resources, in one embodiment of the invention, after grinding, the mineral with a particle size >2mm is returned to the grinding mill for secondary grinding; and magnetically separating the minerals with the granularity of less than 0.1mm to obtain the magnetically separated titanium concentrate.
In one embodiment of the invention, the magnetic separation titanium concentrate is obtained by magnetic separation of minerals with the particle size of less than 0.1mm under the magnetic field intensity of 60-80 kA/m.
And d, electrically separating, namely sending the concentrate II to an electric separator for electrically separating to obtain the titanium concentrate.
In one embodiment of the invention, the electric separator is a three drum high pressure separator. The concentrator is conventional and may be of the commercially available type.
The method can greatly improve the grade of the titanium concentrate, the titanium recovery rate is high, and the grade of the titanium concentrate obtained in the step d is 55-62%.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
Ilmenite raw ore produced from Panzhihua, the titanium grade of which is 31.49%, the main impurity component of which contains 27.46% by mass of magnesium oxide, 17.23% by mass of silicon dioxide and 7.43% by mass of calcium oxide, is transported to a crushing workshop from a stope by an automobile. The crushing adopts a jaw crusher, the feeding amount Qh of the rough crusher is 2000.0t/h, the feeding granularity is 1000-0 mm, the ore discharge granularity is 50-0 mm, and the loose density is 2.36t/m3The width e of the designed ore discharge port is 50mm, and the production capacity is designed and selected: q is 4300t/h, and obtaining a crushed product, wherein 20-50 mm of particles in the crushed product account for about 80%; separating the crushed product by using a dry magnetic separator under the magnetic field intensity of 300kA/m to obtain iron ore concentrate I and non-metallic waste rocks; will be provided withAnd (3) feeding the concentrate I to a grinding machine to be ground to 0.1-2 mm, returning the minerals with the granularity larger than 2mm to the grinding machine for secondary grinding, magnetically separating the minerals with the granularity of-0.1 mm under the magnetic field intensity of 80kA/m to obtain titanium concentrate, and feeding the concentrate II with the granularity of 0.1-2 mm to a three-drum high-pressure concentrating machine for electric concentration to obtain the titanium concentrate. The indexes of the electric separation product obtained by a daily 1t continuous expansion test are as follows: the grade of the titanium concentrate is 57.74 percent, and the recovery rate is 69.57 percent.
Example 2
An ore with a titanium grade of 34.26% is transported from the stope to the crushing plant by car. Crushing the mixture to-50 mm by a jaw crusher, designing the width e of a mine discharge opening to be 50mm, and the loose density to be 2.45t/m3Designing and selecting the production capacity: q is 4300t/h, and obtaining a crushed product, wherein 20-50 mm of particles in the crushed product account for about 80%; separating the crushed product by using a dry magnetic separator under the magnetic field intensity of 320kA/m to obtain iron ore concentrate I and non-metallic waste rocks; and (3) feeding the concentrate I to a grinding machine to be ground to 0.1-2 mm, returning the minerals with the granularity larger than 2mm to the grinding machine for secondary grinding, magnetically separating the minerals with the granularity of-0.1 mm under the magnetic field intensity of 80kA/m to obtain titanium concentrate, and feeding the concentrate II with the granularity of 0.1-2 mm to a three-drum high-pressure concentrating machine for electric concentration to obtain the titanium concentrate. The indexes of the electric separation product obtained by a daily 1t continuous expansion test are as follows: the grade of the titanium concentrate is 61.93 percent, and the recovery rate is 72.35 percent.
Claims (10)
1. A magnetic separation-electric separation combined titanium separation method is characterized by comprising the following steps:
a. crushing: crushing ilmenite until the particle size of 20-50 mm accounts for 75-85% to obtain a crushed product;
b. magnetic separation and tailing discarding: magnetically separating the crushed product under the magnetic field intensity of 280-320 kA/m to obtain waste rocks and a first concentrate;
c. grinding: grinding the first concentrate to obtain a second concentrate with the particle size of 0.1-2 mm;
d. electric selection: and feeding the concentrate II to an electric separator for electric separation to obtain titanium concentrate.
2. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: the ilmenite is limonite or magnetite, and the grade of titanium in the ilmenite is 28.47% -34.59%.
3. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: in the step a, a jaw crusher is adopted for crushing.
4. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: in the step a, ilmenite is crushed to 20-50 mm, which accounts for 80%.
5. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: in the step b, the magnetic separation is dry magnetic separation; preferably, the dry magnetic separation adopts a permanent magnetic medium field strength dry magnetic separator.
6. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: and c, grinding by using a roller type superfine grinding machine.
7. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: in the step c, after grinding, the mineral with the granularity of more than 2mm returns to the grinding machine for secondary grinding; and magnetically separating the minerals with the granularity of less than 0.1mm to obtain the magnetically separated titanium concentrate.
8. The magnetic separation-electric separation combined titanium separation method according to claim 7, characterized in that: the magnetic field intensity of the magnetic separation of minerals with the granularity less than 0.1mm is 60-80 kA/m.
9. The magnetic separation-electric separation combined titanium separation method according to claim 1, characterized in that: in the step d, the electric separator is a three-drum high-pressure separator.
10. The magnetic separation-electric separation combined titanium separation method according to any one of claims 1 to 9, characterized in that: the grade of the titanium concentrate obtained in the step d is 55-62%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113953081A (en) * | 2021-09-29 | 2022-01-21 | 河钢承德钒钛新材料有限公司 | Beneficiation method for high-grade titanium concentrate |
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| CN113953081A (en) * | 2021-09-29 | 2022-01-21 | 河钢承德钒钛新材料有限公司 | Beneficiation method for high-grade titanium concentrate |
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