CN112156889B - Beneficiation method for pyroxene type ilmenite - Google Patents
Beneficiation method for pyroxene type ilmenite Download PDFInfo
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- CN112156889B CN112156889B CN202011008616.5A CN202011008616A CN112156889B CN 112156889 B CN112156889 B CN 112156889B CN 202011008616 A CN202011008616 A CN 202011008616A CN 112156889 B CN112156889 B CN 112156889B
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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
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- 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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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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
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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
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Abstract
The invention provides a beneficiation method of peridotite type ilmenite, compared with the prior art, the beneficiation method is provided with grading operation after a section of strong magnetic concentrate of a section of iron ore tailings is processed, the condition that most of fine-grained materials in the section of strong magnetic concentrate do not enter coarse grain gravity separation is ensured, the grade of the coarse grain gravity separation tailings can be reduced, meanwhile, most of fine-grained materials in the section of strong magnetic concentrate enter a fine-grained gravity separation system, gravity separation is increased, interfering minerals such as olivine and the like with similar magnetism to ilmenite can be effectively removed, and the grade of ilmenite enrichment can be improved.
Description
Technical Field
The invention belongs to the technical field of metal recovery, and particularly relates to a beneficiation method of pyroxene type ilmenite.
Background
Chinese titanium resources are the first in the world, and reserves account for 40% of the world, wherein more than 90% are in Panxi region. However, the titanium resource in the Panxi region is mainly rock ore type vanadium-titanium magnetite and the content of calcium and magnesium is high, which belongs to ilmenite difficult to develop and utilize. Particularly, the pyroxene mineral content in pyroxene type vanadium titano-magnetite is 30% higher than that of pyroxene type, and the olivine mineral content is 10-30% higher than that of pyroxene type, so that the pyroxene type ilmenite is more difficult to recover due to the influence of olivine.
Currently, ilmenite is recycled in Panxi area mainly by adopting a process flow of 'classification + two-stage strong magnetism + flotation' (as shown in figure 1), and TiO can be obtained2The grade of the titanium concentrate reaches over 47 percent, and the recovery rate of the flotation operation reaches over 75 percent. However, the process flow is used for recycling the pyroxene type ilmenite, the flotation raw ore produced by multi-stage strong magnetism is very low, and only TiO can be obtained2The grade of the raw ore is 10 to 16 percent, and the low flotation feeding is very unfavorable for the flotation. Finally, the grade and the recovery rate of the obtained titanium concentrate are not ideal, the cost of the flotation reagent is high, and the aim of economically and efficiently utilizing the titanium resource cannot be achieved.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide a beneficiation method of ilmenite, wherein the recovery method can ensure the quality of ilmenite concentrate, improve the flotation feed grade and reduce the beneficiation cost of ilmenite.
The invention provides a beneficiation method of pyroxene type ilmenite, which comprises the following steps:
carrying out slag separation treatment on the primary iron ore dressing tailings of the pyroxene type ilmenite, and then carrying out coarse-grain primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings;
performing primary strong magnetic roughing on the primary deironing tailings to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
Performing primary strong magnetic scavenging on the primary strong magnetic rougher tailings to obtain primary strong magnetic scavenged concentrate and primary strong magnetic scavenged tailings;
grading the first-stage strong magnetic roughing concentrate and the first-stage strong magnetic scavenging concentrate to obtain oversize materials and undersize materials;
performing coarse grain reselection on the oversize material to obtain coarse grain reselection concentrate and coarse grain reselection tailings;
performing coarse-grained secondary deferrization on the coarse-grained gravity concentrate to obtain secondary deferrization concentrate and secondary deferrization tailings;
performing coarse-grain second-stage strong-magnetic roughing on the second-stage deironing tailings to obtain second-stage strong-magnetic roughing concentrate and second-stage strong-magnetic roughing tailings;
carrying out coarse-grain second-stage strong-magnetic scavenging on the second-stage strong-magnetic roughing tailings to obtain second-stage strong-magnetic scavenging concentrate and second-stage strong-magnetic scavenging tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed ores.
Preferably, the method comprises the following steps:
carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron ore tailings, and then carrying out fine-grain first-stage iron removal to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings;
performing fine-grain primary strong magnetic roughing on the fine-grain primary deironing tailings to obtain fine-grain primary strong magnetic roughing concentrate and fine-grain primary strong magnetic roughing tailings;
Carrying out fine particle first-stage strong magnetic scavenging on the fine particle first-stage strong magnetic rougher tailings to obtain fine particle first-stage strong magnetic scavenged concentrate and fine particle first-stage strong magnetic scavenged tailings;
performing fine grain reselection on the fine-grain first-stage strong magnetic rough concentration concentrate and the fine-grain first-stage strong magnetic scavenging concentrate to obtain fine grain reselection concentrate and fine grain reselection tailings;
carrying out fine particle second-stage strong magnetic roughing on the fine particle gravity concentrate to obtain fine particle second-stage strong magnetic roughing concentrate and fine particle second-stage strong magnetic roughing tailings;
carrying out fine grain second-stage strong magnetic scavenging on the fine grain second-stage strong magnetic rougher tailings to obtain fine grain second-stage strong magnetic scavenged concentrate and fine grain second-stage strong magnetic scavenged tailings;
performing fine-grain secondary-stage iron removal on the fine-grain secondary-stage strong magnetic rough concentration and the fine-grain secondary-stage strong magnetic scavenging concentrate to obtain fine-grain secondary-stage iron-removed concentrate and fine-grain flotation feed ore;
carrying out strong magnetic scavenging on the fine grain gravity tailings to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings;
and returning the fine-grained strong magnetic scavenging concentrate to fine-grained gravity separation feeding.
Preferably, the magnetic field intensity of the first-stage iron removal of the fine particles is 1000-3000 Aute; the magnetic field intensity of the fine particle section of strong magnetic rough separation is 5000-10000 oersted; the magnetic field intensity of the fine particle section strong magnetic scavenging is 3000-8000 Ott; the fine particle reselection 
A spiral chute; the magnetic field intensity of the two-section strong magnetic rough separation of the fine particles is 5000-10000 oersted; the magnetic field intensity of the two-stage strong magnetic scavenging of the fine particles is 3000-8000 Ott; the magnetic field intensity of the iron removal of the two-stage fine particle is 1000-3000 Aute.
Preferably, the first and second liquid crystal materials are,
reselecting the undersize material to obtain reselected concentrate and reselected tailings;
combining the gravity concentrate and the fine gravity concentrate for fine secondary strong magnetic roughing;
strong magnetic scavenging is carried out on the gravity tailings to obtain scavenged concentrate and scavenged tailings;
and returning the scavenging concentrate to the undersize material for gravity separation feeding.
Preferably, the undersize material is selected by gravity
A spiral chute; the magnetic field intensity of the gravity tailings strong magnetic scavenging is 3000-8000 Ottes.
Preferably, the coarse grain gravity concentration is subjected to ore grinding treatment and then inspection and classification, oversize products subjected to inspection and classification are returned to the ore grinding treatment, and undersize products subjected to inspection and classification are subjected to coarse grain secondary deferrization; the aperture of the classifying screen for inspecting and classifying is 0.154-0.074 mm.
Preferably, the fineness of the ore grinding treatment is-0.074 mm 60% -100%.
Preferably, the magnetic field intensity of the first-stage iron removal of the coarse grains and the second-stage iron removal of the coarse grains is 1000-3000 Aute respectively and independently; the magnetic field intensity of the first-section strong magnetic rough separation is 5000-10000 oersted; the magnetic field intensity of the section of strong magnetic scavenging is 3000-8000 Ottes; the aperture of the grading sieve used for grading is 0.074-0.154 mm; the magnetic field intensity of the coarse grain two-section strong magnetic roughing is 5000-10000 Aute; the magnetic field intensity of the coarse grain two-stage strong magnetic scavenging is 3000-8000 Ottes.
Compared with the prior art, the grading operation is arranged after the first section of strong magnetic concentrate of the first section of iron ore tailings, so that most of fine-grained materials in the first section of strong magnetic concentrate are prevented from entering the coarse grain reselection, the grade of the coarse grain reselection tailings can be reduced, and meanwhile, most of fine-grained materials in the first section of strong magnetic concentrate enter a fine-grained grading system, so that the reselection is increased, the interference minerals such as olivine and the like with the magnetism similar to that of ilmenite can be effectively removed, and the grade of ilmenite enrichment can be improved.
Drawings
FIG. 1 is a schematic diagram of a conventional "classification + two-stage strong magnetic + flotation" process;
fig. 2 is a schematic flow chart of the beneficiation method of the ilmenite type ilmenite provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a beneficiation method of pyroxene type ilmenite, which comprises the following steps:
Carrying out slag separation treatment on the primary iron ore dressing tailings of the pyroxene type ilmenite, and then carrying out coarse-grain primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings;
performing primary strong magnetic roughing on the primary deironing tailings to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
performing primary strong magnetic scavenging on the primary strong magnetic roughing tailings to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings;
grading the first-stage strong magnetic roughing concentrate and the first-stage strong magnetic scavenging concentrate to obtain oversize materials and undersize materials;
performing coarse grain reselection on the oversize material to obtain coarse grain reselection concentrate and coarse grain reselection tailings;
performing coarse-grained secondary deferrization on the coarse-grained gravity concentrate to obtain secondary deferrization concentrate and secondary deferrization tailings;
performing coarse-grain second-stage strong-magnetic roughing on the second-stage deironing tailings to obtain second-stage strong-magnetic roughing concentrate and second-stage strong-magnetic roughing tailings;
carrying out coarse-grain second-stage strong-magnetic scavenging on the second-stage strong-magnetic roughing tailings to obtain second-stage strong-magnetic scavenging concentrate and second-stage strong-magnetic scavenging tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed ores.
According to the invention, grading operation is set after the first section of strong magnetic concentrate of the first section of iron tailings, so that most fine-grained materials in the first section of strong magnetic concentrate are prevented from entering the coarse grain reselection, the grade of the coarse grain reselection tailings can be reduced, and meanwhile, most fine-grained materials in the first section of strong magnetic concentrate enter a fine-grained grading system, so that reselection is increased, interfering minerals such as olivine and the like with similar magnetism to ilmenite can be effectively removed, and the grade of ilmenite enrichment can be improved.
In the present invention, the sources of all raw materials are not particularly limited, and they may be commercially available.
Carrying out slag separation treatment on the primary iron ore dressing tailings of the pyroxene type ilmenite, and then carrying out coarse-grain primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings; the preferable slag separation sieve pore for slag separation treatment is 5-1 mm; the intensity of the field removed from the first-stage coarse grain is preferably 1000-3000 Auterse, more preferably 1500-2500 Auterse, and still more preferably 2000 Auterse.
Performing primary strong magnetic roughing on the primary deironing tailings to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings; the magnetic field intensity of the first-section strong magnetic rough separation is preferably 5000-10000 Authentic, more preferably 6000-8000 Authentic, and further preferably 7000 Authentic; the rotating speed of the first-stage strong magnetic rough separation is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the primary strong magnetic rough separation is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the first-stage strong magnetic rough separation is preferably 25-40 mm, and more preferably 30-35 mm.
Performing primary strong magnetic scavenging on the primary strong magnetic roughing tailings to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings; the magnetic field intensity of the section of strong magnetic scavenging is preferably 3000-8000 Ottes, more preferably 4000-6000 Ottes, and further preferably 5000 Ottes; the rotating speed of the section of strong magnetic scavenging is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the one-section strong magnetic scavenging is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the strong magnetic scavenging of the section is preferably 25-40 mm, and more preferably 30-35 mm. The strong magnetic scavenging is used for recovering monomer ilmenite and ilmenite enriched intergrowth which are not recovered in the strong magnetic roughing tailings, and the recovery rate of strong magnetic separation is improved.
Grading the first section of strong magnetic roughing concentrate and the first section of strong magnetic scavenging concentrate to obtain oversize materials and undersize materials; the aperture of the grading sieve used for grading is preferably 0.074-0.154 mm, more preferably 0.8-0.13 mm, still more preferably 0.9-0.11 mm, and most preferably 0.1 mm.
And performing coarse grain reselection on the oversize material to obtain coarse grain reselection concentrate and coarse grain reselection tailings. The concentration of the reselected feed ore is controlled to be 20-40%, more preferably 25-35%, and most preferably 30%. And controlling the amount of the fed ore by gravity to be 2-8 t/h.
According to the invention, the coarse gravity concentrate is preferably subjected to ore grinding treatment; the fineness of the ground ore is preferably 60 to 90 percent of minus 200 meshes, more preferably 70 to 85 percent of minus 200 meshes, and further preferably 80 to 85 percent of minus 200 meshes; after grinding, checking and grading; the aperture of the grading sieve used for grading is preferably 0.074-0.154 mm, more preferably 0.8-0.13 mm, still more preferably 0.9-0.11 mm, and most preferably 0.1 mm; checking the classified oversize material and preferably returning to ore grinding treatment; detecting the classified screen underflow, and performing coarse grain secondary deferrization to obtain secondary deferrization concentrate and secondary deferrization tailings; the magnetic field intensity of the two-stage deironing is preferably 1000-3000 oersted, more preferably 1500-2500 oersted, and still more preferably 2000 oersted.
Performing coarse-grain second-stage strong-magnetic roughing on the second-stage deironing tailings to obtain second-stage strong-magnetic roughing concentrate and second-stage strong-magnetic roughing tailings; the magnetic field intensity of the coarse grain two-section strong magnetic roughing is preferably 5000-10000 Authents, more preferably 6000-8000 Authents, and further preferably 7000 Authents; the rotating speed of the coarse-grain two-stage strong magnetic rough concentration is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the coarse-grain two-stage strong magnetic roughing is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the coarse grain two-stage strong magnetic roughing is preferably 25-40 mm, and more preferably 30-35 mm.
Carrying out coarse-grain second-stage strong-magnetic scavenging on the second-stage strong-magnetic roughing tailings to obtain second-stage strong-magnetic scavenging concentrate and second-stage strong-magnetic scavenging tailings; the magnetic field intensity of the coarse grain second-stage strong magnetic scavenging is preferably 3000-8000 Ott, more preferably 4000-6000 Ott, and further preferably 5000 Ott; the rotating speed of the coarse grain second-stage strong magnetic scavenging is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the coarse-grain two-stage strong magnetic scavenging is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the coarse grain second-stage strong magnetic scavenging is preferably 25-40 mm, and more preferably 30-35 mm. The strong magnetic scavenging is used for recovering fine-fraction minerals which are not recovered in the strong magnetic roughing tailings, reducing the titanium grade of the tailings and improving the recovery rate of the strong magnetic separation.
And taking the two-stage strong magnetic rough concentration concentrate and the two-stage strong magnetic scavenging concentrate as coarse flotation feed ores, entering a sulfur-floating and titanium-floating system to obtain flotation titanium concentrate, wherein the sulfur floating adopts a primary coarse sweeping or primary coarse sweeping flow, and the titanium floating adopts a primary coarse sweeping and secondary sweeping flow and a tertiary coarse sweeping and five-time fine concentration flow.
Carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron separation tailings, namely tailings obtained after second-stage grinding magnetic separation in the iron separation process, and then carrying out fine-grain first-stage iron removal to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings; the preferable slag separation sieve pore for slag separation treatment is 5-1 mm; the magnetic field intensity for removing iron in the first stage of the fine particles is preferably 1000-3000 oersted, more preferably 1500-2500 oersted, and still more preferably 2000 oersted.
Performing fine-grain primary strong magnetic roughing on the fine-grain primary deironing tailings to obtain fine-grain primary strong magnetic roughing concentrate and fine-grain primary strong magnetic roughing tailings; the magnetic field intensity of the fine-grain first-stage strong magnetic rough separation is preferably 5000-10000 Authentic, more preferably 6000-8000 Authentic, and further preferably 7000 Authentic; the rotating speed of the fine-grain first-stage strong magnetic rough concentration is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the first-stage strong magnetic roughing of the fine particles is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the first-stage strong magnetic roughing of the fine particles is preferably 25-40 mm, and more preferably 30-35 mm.
Carrying out fine-grain primary strong magnetic scavenging on the fine-grain primary strong magnetic rougher tailings to obtain fine-grain primary strong magnetic scavenged concentrate and fine-grain primary strong magnetic scavenged tailings; the magnetic field intensity of the first-stage strong magnetic scavenging of the fine particles is preferably 3000-8000 Ott, more preferably 4000-6000 Ott, and further preferably 5000 Ott; the rotating speed of the fine-grain first-stage strong magnetic scavenging is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the first-stage strong magnetic scavenging of the fine particles is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the first-stage strong magnetic scavenging of the fine particles is preferably 25-40 mm, and more preferably 30-35 mm. The scavenging is to further recover fine-grained minerals in a section of strong magnetic roughing tailings and improve the recovery rate of strong magnetic separation.
Performing fine grain reselection (concentrate concentration, tailing scavenging and middling return recleaning) on the fine grain first-stage strong magnetic roughing concentrate and the fine grain first-stage strong magnetic scavenging concentrate to obtain fine grain reselected concentrate and fine grain reselected tailings; the ore-feeding concentration for fine particle reselection is preferably controlled to be 20-40%, more preferably 25-35%, and most preferably 30%; and the ore feeding amount of the fine particle reselection is controlled to be 2-8 t/h.
Carrying out fine particle second-stage strong magnetic roughing on the fine particle gravity concentrate to obtain fine particle second-stage strong magnetic roughing concentrate and fine particle second-stage strong magnetic roughing tailings; the magnetic field intensity of the two-stage strong magnetic rough separation of the fine particles is preferably 5000-10000 Authentic, more preferably 6000-8000 Authentic, and further preferably 8000 Authentic; the rotating speed of the two-stage strong magnetic rough concentration of the fine particles is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the two-stage strong magnetic rough concentration of the fine particles is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the two-stage strong magnetic roughing of the fine particles is preferably 25-40 mm, and more preferably 30-35 mm.
Carrying out fine grain second-stage strong magnetic scavenging on the fine grain second-stage strong magnetic rougher tailings to obtain fine grain second-stage strong magnetic scavenged concentrate and fine grain second-stage strong magnetic scavenged tailings; the magnetic field intensity of the two-stage strong magnetic scavenging of the fine particles is preferably 3000-8000 Ott, more preferably 4000-6000 Ott, and further preferably 5000 Ott; the rotating speed of the rotating ring for the two-stage strong magnetic scavenging of the fine particles is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the first-stage strong magnetic scavenging of the fine particles is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the two-stage strong magnetic scavenging of the fine particles is preferably 25-40 mm, and more preferably 30-35 mm.
Performing fine particle secondary iron removal on the fine particle secondary strong magnetic rougher concentrate and the fine particle secondary strong magnetic scavenging concentrate to obtain fine particle secondary iron removal concentrate and fine particle flotation feed; the magnetic field intensity for removing iron in the fine particle secondary stage is preferably 1000-3000 Autos, more preferably 1500-2500 Autos, and further preferably 2000 Autos.
According to the invention, the fine grain gravity tailings are subjected to strong magnetic scavenging to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings; the magnetic field intensity of the strong magnetic scavenging is preferably 3000-8000 Ottos, more preferably 4000-6000 Ottos, and further preferably 5000 Ottos; the rotating speed of the rotating ring for the two-stage strong magnetic scavenging of the fine particles is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the first-stage strong magnetic scavenging of the fine particles is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the two-stage strong magnetic scavenging of the fine particles is preferably 25-40 mm, and more preferably 30-35 mm.
And returning the fine-grained strong magnetic scavenging concentrate to fine-grained gravity separation feeding.
Undersize materials classified in the coarse grain process are preferably subjected to undersize gravity separation (concentrate concentration, tailing scavenging and middling return recleaning) to obtain gravity concentrate and gravity tailings; the concentration of ore feeding for undersize reselection is controlled to be 20-40%, more preferably 25-35%, and most preferably 30%; and the ore feeding amount of undersize gravity separation is controlled to be 2-8 t/h.
Combining the gravity concentrate with the fine gravity concentrate to perform fine secondary strong magnetic rough separation; the two-stage ferromagnetic roughing of the fine particles is the same as that described above, and is not described in detail here.
Strong magnetic scavenging is carried out on the gravity tailings to obtain scavenged concentrate and scavenged tailings; the magnetic field intensity of the strong magnetic scavenging is preferably 3000-8000 Ottos, more preferably 4000-6000 Ottos, and further preferably 5000 Ottos; the rotating speed of the strong magnetic scavenging is preferably 2-4 r/min, and more preferably 3 r/min; the pulse frequency of the strong magnetic scavenging is preferably 200-400 times/min, more preferably 250-350 times/min, and further preferably 300 times/min; the stroke of the strong magnetic scavenging is preferably 25-40 mm, and more preferably 30-35 mm.
And returning the scavenging concentrate to the undersize material for gravity separation feeding.
The grading operation is set after the first section of strong magnetic concentrate of the first section of iron tailings is selected, so that most fine-grained materials in the first section of strong magnetic concentrate are prevented from entering coarse grain reselection, the grade of reselected tailings can be reduced, and meanwhile most fine-grained materials in the first section of strong magnetic concentrate enter a fine-grained grading system, so that reselection is increased, interfering minerals such as olivine and the like with similar magnetism to ilmenite can be effectively removed, and the enrichment grade of ilmenite can be improved; secondly, fine grain reselection is arranged behind a section of strong magnetic concentrate of fine-grained materials, so that interfering minerals such as olivine and the like with similar magnetism to ilmenite can be effectively removed, different reselection equipment suitable for fine-grained beneficiation can be selected for fine-grained reselection, and the reselection process can be a multi-section operation combination of roughing, scavenging and concentrating of single or multiple reselection equipment; thirdly, strong magnetic scavenging is set for the tailings of fine grain reselection, and the scavenged concentrate returns for reselection, so that the grade of the reselected tailings is further reduced, and the operation recovery rate of reselection is improved.
Compared with the prior titanium separation process flow of ilmenite in the region, the process has the advantages that the grading operation is set after the strong magnetic concentrate in the first section of iron tailings is separated, the coarse grain reselection is carried out on materials on a screen, so that the interference minerals such as olivine and the like with similar magnetism to the ilmenite can be effectively removed, the enrichment grade of the ilmenite can be improved, and the iron and strong magnetism are removed after the gravity concentrate is ground to obtain the float material; undersize and second-stage iron tailings enter a fine particle titanium separation process, fine particle reselection and tailings strong magnetic scavenging are arranged in the fine particle titanium separation process, interfering minerals such as olivine and the like with magnetism similar to that of ilmenite can be effectively removed, meanwhile, the reselection operation recovery rate is improved, fine particle gravity concentrate is subjected to strong magnetic to obtain fine particle floating materials, the two floating materials are mixed and enter sulfur floating and titanium floating, and the management cost is reduced. The technique of the invention can efficiently recover the pyroxene type ilmenite and has obvious economic and social benefits.
To further illustrate the present invention, the following examples are provided to describe in detail a process for the beneficiation of ilmenite of the pyroxene type.
The reagents used in the following examples are all commercially available.
Example 1
Carrying out slag separation treatment on primary iron separation tailings (tailings obtained by primary grinding and magnetic separation in the iron separation process) of pyroxene type ilmenite through a slag separation screen with the aperture of 3mm, and then carrying out primary iron removal on coarse particles, wherein the magnetic field intensity is 2000 oersted, so as to obtain primary iron removal concentrate and primary iron removal tailings;
Performing primary strong magnetic roughing on the primary deironing tailings, wherein the magnetic field intensity is 7000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
carrying out primary strong magnetic scavenging on the primary strong magnetic roughing tailings (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings;
grading the primary strong magnetic roughing concentrate and the primary strong magnetic scavenging concentrate (the aperture of a grading sieve is 0.1mm) to obtain an oversize material and an undersize material;
performing coarse grain gravity separation (concentrate concentration, tailing scavenging and middling return recleaning) on the oversize material to obtain coarse grain gravity concentrate and coarse grain gravity tailings; controlling the concentration of coarse grain gravity feed ore at 30%; the ore feeding amount of coarse grain reselection is controlled to be 4 t/h;
carrying out ore grinding treatment on the coarse grain gravity concentration concentrate (the ore grinding fineness is 85 percent of-200 meshes), then checking and grading, returning oversize products subjected to checking and grading (the aperture of a grading sieve is 0.1mm) to carry out ore grinding treatment, and carrying out coarse grain secondary deferrization (the magnetic field intensity is 2000 oersted) on undersize products subjected to checking and grading to obtain secondary deferrization concentrate and secondary deferrization tailings;
Performing coarse grain secondary strong magnetic roughing on the secondary iron-removed tailings (the magnetic field strength is 7000 oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain secondary strong magnetic roughing concentrate and secondary strong magnetic roughing tailings;
performing coarse grain second-stage strong magnetic scavenging on the second-stage strong magnetic rougher tailings (the magnetic field intensity is 5000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain second-stage strong magnetic scavenged concentrate and second-stage strong magnetic scavenged tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed.
Carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron separation tailings (tailings after second-stage grinding magnetic separation in the iron separation process) by using a slag separation screen with the aperture of 1mm, and then carrying out fine-grain first-stage iron removal (magnetic field intensity of 2000 oersted) to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings;
performing fine grain first-stage strong magnetic roughing on the fine grain first-stage deironing tailings (the magnetic field intensity is 8000 oersteds, the rotating speed is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic roughing concentrate and fine grain first-stage strong magnetic roughing tailings;
carrying out fine grain first-stage strong magnetic scavenging on the fine grain first-stage strong magnetic roughing tailings (the magnetic field intensity is 5000 oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic scavenging concentrate and fine grain first-stage strong magnetic scavenging tailings;
Performing fine grain reselection (concentrate concentration, tailing scavenging and middling return recleaning) on the fine grain first-stage strong magnetic roughing concentrate and the fine grain first-stage strong magnetic scavenging concentrate to obtain fine grain reselected concentrate and fine grain reselected tailings; the concentration of the fine particle gravity ore feeding is controlled to be 30%, and the quantity of the gravity ore feeding is controlled to be 4 t/h.
Performing fine grain two-stage strong magnetic roughing on the fine grain gravity concentrate (the magnetic field intensity is 8000 Oersted, the rotating speed is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain two-stage strong magnetic roughing concentrate and fine grain two-stage strong magnetic roughing tailings;
carrying out fine grain two-stage strong magnetic scavenging on the fine grain two-stage strong magnetic roughing tailings (the magnetic field intensity is 5000 oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain two-stage strong magnetic scavenging concentrate and fine grain two-stage strong magnetic scavenging tailings;
performing fine-grain secondary-stage iron removal (magnetic field intensity of 2000 Oersted) on the fine-grain secondary-stage strong magnetic rough concentration and the fine-grain secondary-stage strong magnetic scavenging concentrate to obtain fine-grain secondary-stage iron-removed concentrate and fine-grain flotation feed ore;
performing strong magnetic scavenging on the fine grain gravity tailings (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings;
And returning the fine-grained strongly magnetic scavenging concentrate to fine-grained gravity separation feeding.
Reselecting the undersize materials (concentrate concentration, tailing scavenging, middling returning and recleaning) to obtain gravity concentrate and gravity tailings; the feeding concentration of undersize gravity separation is controlled at 30%; the ore feeding amount of the undersize gravity separation is controlled to be 4 t/h;
combining the gravity concentrate and the fine gravity concentrate to carry out fine two-stage strong magnetic roughing (magnetic field intensity of 8000 oersted, rotating speed of 3r/min, pulsation frequency of 300 times/min, stroke of 35 mm);
performing strong magnetic scavenging on the gravity tailings (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain scavenged concentrate and scavenged tailings;
and returning the scavenging concentrate to the undersize material for gravity separation feeding.
The two-stage high-intensity magnetic rougher concentrate obtained in example 1 and the two-stage high-intensity magnetic scavenged concentrate (coarse-grained concentrate in table 1), the two-stage high-intensity magnetic scavenged tailing (coarse-grained tailing in table 1), the fine-grained flotation feed ore (fine-grained concentrate in table 1), the fine-grained two-stage high-intensity magnetic scavenged tailing (fine-grained tailing in table 1) were subjected to TiO treatment2The content was measured and the results are shown in Table 1.
TABLE 1 TiO in example 1 and comparative example 12Content detection result
As can be seen from table 1, the recovery of the titanium rough concentrate of the coarse fraction minerals obtained by the procedure of example 1 is 5.66 percentage points lower than that of the procedure of comparative example 1, but the titanium rough concentrate TiO is lower 2The grade is ensured to be 6.68 percent higher than that of the flow of the comparative example 1; the recovery rate of the titanium rough concentrate of the fine-fraction minerals obtained by the process of the example 1 is lower than that of the comparative process by 5.57 percent, but the titanium rough concentrate TiO2The grade is 2.09 percent higher than that of the flow of the comparative example 1. It can be seen that the flow of example 1 can obtain higher-grade flotation feed, and the high-grade flotation feed is more beneficial to flotation, and the reagent consumption is reduced, so that the flotation cost is reduced.
The components of the raw ore, concentrate and tailings during the fine particle reselection process of example 1 were analyzed and the results are shown in table 2.
TABLE 2 Fine grain reselectiongen, fine, tailings compositions and quantitative analysis%
As can be seen from table 2, the fine fraction minerals can be separated by gravity to throw off part of olivine and fine fraction titanomagnetite, which greatly interfere with the subsequent flotation.
The primary strong magnetic rougher concentrate and the primary strong magnetic scavenger concentrate obtained in example 1 were subjected to full-grain size screening, and the results of the full-grain size screening are shown in table 3.
TABLE 3 full-size sieving results of one-stage strong magnetic concentrate of one-stage tailings
As can be seen from Table 3, the content of the first-stage ferromagnetic concentrate of-200 meshes is 46.13%, and the content of TiO is2The grade increases as the size fraction becomes finer.
The oversize material and the undersize material obtained by classifying and screening the primary strong magnetic roughing concentrate and the primary strong magnetic scavenging concentrate obtained in the example 1 were analyzed, and the obtained results are shown in tables 4 and 5.
TABLE 4 strong fine grading test results for tailings in first section
| Name(s) | Yield/%) | TiO2Grade/% | TiO2Percent recovery% |
| +0.1mm sieve | 39.08 | 5.79 | 29.83 |
| Minus 0.1mm undersize | 60.92 | 8.74 | 70.17 |
| Ore feeding | 100.00 | 7.59 | 100.00 |
TABLE 5 oversize and undersize fraction screen analysis results
As can be seen from Table 5, the content of the concentrated ferromagnetic ore in the first stage is 12.50% in the sieve with 200 meshes and 66.63% in the sieve with 200 meshes.
The coarse gravity concentrate from the coarse gravity separation of the oversize material of example 1 was compared to the coarse two-stage ferromagnetic process (including roughing and scavenging) of comparative example 1 and the results are shown in table 6.
TABLE 6 comparison of results of gravity and ferromagnetic tests on sieves
It can be seen from table 6 that the recovery rates of the gravity concentrate and the strong magnetic concentrate are equivalent, but the grade of the gravity concentrate is about 2% higher than that of the strong magnetic concentrate, and the grade of the gravity tailings is slightly lower than that of the strong magnetic tailings.
The undersize material gravity separation process of example 1 was compared to the fine particle two-stage ferromagnetic process (including rougher flotation and scavenger) of comparative example 1 and the results are shown in table 7.
TABLE 7 comparison of undersize reselection and ferromagnetic test results
It can be seen from table 7 that the recovery rate of the gravity concentrate is 8.57 percentage points lower than that of the strong magnetic concentrate, but the grade of the gravity concentrate is about 2.85 percentage points higher than that of the strong magnetic concentrate, and the grade of the gravity tailings is slightly higher than that of the strong magnetic tailings.
Example 2
First-stage iron separation tailings (tailings of first-stage grinding magnetic separation in the iron separation process) of the peridotite type ilmenite are subjected to slag separation treatment by a slag separation sieve with the aperture of 3mm, and then coarse-stage first-stage iron removal is carried out, wherein the magnetic field intensity is 1000 oersted, so as to obtain first-stage iron removal concentrate and first-stage iron removal tailings;
performing primary strong magnetic roughing on the primary iron-removed tailings, wherein the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
performing primary strong magnetic scavenging on the primary strong magnetic roughing tailings (the magnetic field intensity is 3000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings;
grading the primary strong magnetic roughing concentrate and the primary strong magnetic scavenging concentrate (the aperture of a grading sieve is 0.154mm) to obtain an oversize material and an undersize material;
performing coarse grain reselection on the oversize material (concentrate concentration, tailing scavenging, middling returning and recleaning) to obtain coarse grain reselection concentrate and coarse grain reselection tailing;
carrying out ore grinding treatment on the coarse gravity concentrate (the ore grinding fineness is-200 meshes 60%), then checking and grading, returning oversize products subjected to the checking and grading (the aperture of a grading sieve is 0.154mm) to the ore grinding treatment, and carrying out coarse secondary iron removal (the magnetic field intensity is 1000 oersted) on undersize products subjected to the checking and grading to obtain secondary iron-removed concentrate and secondary iron-removed tailings;
Performing coarse grain two-stage strong magnetic roughing on the two-stage deironing tailings (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain two-stage strong magnetic roughing concentrate and two-stage strong magnetic roughing tailings;
carrying out coarse-grain two-stage strong magnetic scavenging on the two-stage strong magnetic roughing tailings (magnetic field intensity is 3000 oersted, rotating speed of a rotating ring is 3r/min, pulse frequency is 300 times/min, and stroke is 35mm) to obtain two-stage strong magnetic scavenging concentrate and two-stage strong magnetic scavenging tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed.
Carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron separation tailings (tailings after second-stage grinding magnetic separation in the iron separation process) by using a slag separation screen with the aperture of 1mm, and then carrying out fine-grain first-stage iron removal (the magnetic field intensity is 1000 oersteds) to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings;
performing fine grain first-stage strong magnetic roughing on the fine grain first-stage deironing tailings (the magnetic field intensity is 5000 oersted, the rotating speed is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic roughing concentrate and fine grain first-stage strong magnetic roughing tailings;
carrying out fine grain first-stage strong magnetic scavenging on the fine grain first-stage strong magnetic roughing tailings (the magnetic field intensity is 3000 Oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic scavenging concentrate and fine grain first-stage strong magnetic scavenging tailings;
Performing fine grain reselection (concentrate concentration, tailing scavenging and middling returning recleaning) on the fine-grain first-stage strong magnetic rougher concentrate and the fine-grain first-stage strong magnetic scavenged concentrate to obtain fine-grain reselected concentrate and fine-grain reselected tailings;
carrying out fine particle second-stage strong magnetic roughing on the fine particle gravity concentrate (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine particle second-stage strong magnetic roughing concentrate and fine particle second-stage strong magnetic roughing tailings;
carrying out fine grain two-stage strong magnetic scavenging on the fine grain two-stage strong magnetic roughing tailings (the magnetic field intensity is 3000 Oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain two-stage strong magnetic scavenging concentrate and fine grain two-stage strong magnetic scavenging tailings;
performing fine particle secondary iron removal (magnetic field intensity is 1000 oersted) on the fine particle secondary strong magnetic rougher concentrate and the fine particle secondary strong magnetic scavenging concentrate to obtain fine particle secondary iron removal concentrate and fine particle flotation feed;
performing strong magnetic scavenging on the fine grain gravity tailings (magnetic field intensity is 3000 oersted, revolving speed is 3r/min, pulsation frequency is 300 times/min, stroke is 35mm) to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings;
and returning the fine-grained strongly magnetic scavenging concentrate to fine-grained gravity separation feeding.
Reselecting the undersize materials (concentrate concentration, tailing scavenging, middling returning and recleaning) to obtain gravity concentrate and gravity tailings;
combining the gravity concentrate and the fine gravity concentrate for fine two-stage strong magnetic roughing (magnetic field strength of 5000 oersted, rotating speed of 3r/min, pulsation frequency of 300 times/min and stroke of 35 mm);
performing strong magnetic scavenging on the gravity tailings (magnetic field intensity is 3000 oersted, revolving speed of a revolving ring is 3r/min, pulsation frequency is 300 times/min, and stroke is 35mm) to obtain scavenged concentrate and scavenged tailings;
and returning the scavenging concentrate to the undersize material for gravity separation feeding.
The two-stage high-intensity magnetic rougher concentrate obtained in example 2 was subjected to two-stage high-intensity magnetic scavenging concentrate (coarse-grained concentrate in table 8), two-stage high-intensity magnetic scavenged tailing (coarse-grained tailing in table 8), fine-grained flotation feed (fine-grained concentrate in table 8), and TiO in fine-grained two-stage high-intensity magnetic scavenged tailing (fine-grained tailing in table 8)2The content was measured and the results are shown in Table 8.
TABLE 8 TiO in example 2 and comparative example 12Content detection result
As can be seen from table 8, the recovery of the titanium rough concentrate of the coarse fraction minerals obtained by the procedure of example 2 was 7.16 percentage points lower than that of the procedure of comparative example 1, but the titanium rough concentrate TiO was lower than that of the procedure of comparative example 12The grade is 7.78 percent higher than that of the flow of the comparative example 1; the recovery rate of the titanium rough concentrate of the fine fraction minerals obtained by the process of example 2 is 7.00 percent lower than that of the comparative process, but Is titanium rough concentrate TiO2The grade is 2.81 percent higher than that of the flow of the comparative example 1. It can be seen that the flow of example 2 can obtain higher-grade flotation feed, and the high-grade flotation feed is more beneficial to flotation, and the reagent consumption is reduced, so that the flotation cost is reduced.
Example 3
Carrying out first-stage iron removal on first-stage iron separation tailings (tailings obtained by first-stage grinding and magnetic separation in the iron separation process) of pyroxene type ilmenite through slag separation screening with a 3mm aperture, and then carrying out first-stage iron removal on coarse particles, wherein the magnetic field intensity is 3000 oersted, so as to obtain first-stage iron removal concentrate and first-stage iron removal tailings;
performing primary strong magnetic roughing on the primary deironing tailings, wherein the magnetic field intensity is 10000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
carrying out primary strong magnetic scavenging on the primary strong magnetic roughing tailings (the magnetic field intensity is 8000 Oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings;
grading the primary strong magnetic roughing concentrate and the primary strong magnetic scavenging concentrate (the aperture of a grading sieve is 0.074mm) to obtain an oversize material and an undersize material;
Performing coarse grain reselection on the oversize material (concentrate concentration, tailing scavenging, middling returning and recleaning) to obtain coarse grain reselection concentrate and coarse grain reselection tailing;
carrying out ore grinding treatment on the coarse grain gravity concentration concentrate (the ore grinding fineness is-200 meshes and 90 percent), then checking and grading, returning oversize products subjected to checking and grading (the aperture of a grading sieve is 0.074mm) to carry out ore grinding treatment, and carrying out coarse grain secondary deferrization (the magnetic field intensity is 3000 oersted) on undersize products subjected to checking and grading to obtain secondary deferrization concentrate and secondary deferrization tailings;
performing coarse grain two-stage strong magnetic roughing on the two-stage deironing tailings (the magnetic field intensity is 10000 oersteds, the rotating speed of a swivel is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain two-stage strong magnetic roughing concentrate and two-stage strong magnetic roughing tailings;
carrying out coarse-grain two-stage strong magnetic scavenging on the two-stage strong magnetic roughing tailings (the magnetic field intensity is 8000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain two-stage strong magnetic scavenging concentrate and two-stage strong magnetic scavenging tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed.
Carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron separation tailings (tailings after second-stage grinding magnetic separation in the iron separation process) by using a slag separation screen with the aperture of 1mm, and then carrying out fine-grain first-stage iron removal (magnetic field intensity is 3000 oersted) to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings;
Carrying out fine particle first-stage strong magnetic roughing on the fine particle first-stage deironing tailings (the magnetic field intensity is 10000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine particle first-stage strong magnetic roughing concentrate and fine particle first-stage strong magnetic roughing tailings;
carrying out fine grain first-stage strong magnetic scavenging on the fine grain first-stage strong magnetic rougher tailings (the magnetic field intensity is 8000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic scavenged concentrate and fine grain first-stage strong magnetic scavenged tailings;
performing fine grain reselection (concentrate concentration, tailing scavenging and middling return recleaning) on the fine grain first-stage strong magnetic roughing concentrate and the fine grain first-stage strong magnetic scavenging concentrate to obtain fine grain reselected concentrate and fine grain reselected tailings;
performing fine particle two-stage strong magnetic roughing on the fine particle gravity concentrate (the magnetic field intensity is 10000 Oersted, the rotating speed is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine particle two-stage strong magnetic roughing concentrate and fine particle two-stage strong magnetic roughing tailings;
carrying out fine grain two-stage strong magnetic scavenging on the fine grain two-stage strong magnetic roughing tailings (the magnetic field intensity is 8000 Oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain two-stage strong magnetic scavenging concentrate and fine grain two-stage strong magnetic scavenging tailings;
Performing fine-grain secondary-stage iron removal (magnetic field intensity of 3000 oersted) on the fine-grain secondary-stage strong magnetic rough concentration and the fine-grain secondary-stage strong magnetic scavenging concentrate to obtain fine-grain secondary-stage iron-removed concentrate and fine-grain flotation feed ore;
performing strong magnetic scavenging on the fine grain gravity tailings (the magnetic field intensity is 8000 Oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings;
and returning the fine-grained strongly magnetic scavenging concentrate to fine-grained gravity separation feeding.
Reselecting the undersize material (concentrate concentration, tailing scavenging and middling returning recleaning) to obtain reselected concentrate and reselected tailings;
combining the gravity concentrate and the fine gravity concentrate to carry out fine two-stage strong magnetic roughing (the magnetic field intensity is 10000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35 mm);
performing strong magnetic scavenging on the gravity tailings (the magnetic field intensity is 8000 oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain scavenged concentrate and scavenged tailings;
and returning the scavenging concentrate to the undersize material for gravity separation feeding.
The two-stage high-intensity magnetic rougher concentrate obtained in example 3 was subjected to two-stage high-intensity magnetic scavenging concentrate (coarse-grained concentrate in table 9), two-stage high-intensity magnetic scavenged tailing (coarse-grained tailing in table 9), fine-grained flotation feed (fine-grained concentrate in table 9), and TiO in fine-grained two-stage high-intensity magnetic scavenged tailing (fine-grained tailing in table 9) 2The content was measured and the results are shown in Table 9.
TABLE 9 TiO in example 3 and comparative example 12Results of content detection
As can be seen from table 9, the recovery of the titanium rough concentrate obtained by the procedure of example 3 for the coarse fraction minerals was 2.56 percentage points lower than the procedure of comparative example 1, but the titanium rough concentrate TiO was lower2The grade is ensured to be 6.03 percent higher than that of the flow of the comparative example 1;the recovery rate of the titanium rough concentrate of the fine fraction minerals obtained by the flow of example 3 is lower by 3.74 percentage points than that of the comparative flow, but the titanium rough concentrate TiO2The grade is 1.03 percent higher than that of the flow of the comparative example 1. It can be seen that the flow of example 3 can obtain higher-grade flotation feed, and the high-grade flotation feed is more beneficial to flotation, and the reagent consumption is reduced, so that the flotation cost is reduced.
Comparative example 1
The beneficiation process is shown in fig. 1.
The pyroxene type ilmenite iron tailings are subjected to slag separation treatment by a slag separation sieve with the aperture of 3mm and then are graded (please provide the aperture of the grading sieve) to obtain fine-fraction iron tailings and coarse-fraction iron tailings.
Carrying out coarse grain first-stage iron removal on the coarse grain iron tailings, and obtaining first-stage iron removal concentrate and first-stage iron removal tailings by using the magnetic field intensity of 2000 oersted;
performing primary strong magnetic roughing on the primary deironing tailings, wherein the magnetic field intensity is 7000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm to obtain primary strong magnetic roughing concentrate and tailings;
Grouping the first-stage strong magnetic roughing concentrates by a cyclone group (the ore feeding concentration is controlled to be 40%), screening overflow materials by a Dericeli sieve (the aperture is 0.154mm), and performing coarse-grain second-stage deironing (the magnetic field intensity is 2000 oersted) to obtain coarse-grain second-stage deironing concentrates and coarse-grain second-stage deironing tailings; grinding the bottom material and the oversize material of the cyclone group, and returning the ground product to the cyclone group;
carrying out coarse grain second-stage strong magnetic roughing on the coarse grain second-stage deironing tailings, (the magnetic field strength is 7000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm), and obtaining second-stage strong magnetic roughing concentrate and second-stage strong magnetic roughing tailings;
carrying out coarse-grain two-stage strong magnetic scavenging on the two-stage strong magnetic roughing tailings (the magnetic field intensity is 5000 oersted, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain two-stage strong magnetic scavenging concentrate and two-stage strong magnetic scavenging tailings;
and taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed ores.
Performing fine-grain first-stage iron removal on the fine-grain iron tailings, wherein the magnetic field intensity is 2000 oersted, and fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings are obtained;
performing fine grain first-stage strong magnetic roughing on the fine grain first-stage deironing tailings (the magnetic field intensity is 8000 oersteds, the rotating speed is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic roughing concentrate and fine grain first-stage strong magnetic roughing tailings;
Carrying out fine grain first-stage strong magnetic scavenging on the fine grain first-stage strong magnetic roughing tailings (the magnetic field intensity is 5000 oersted, the rotating speed is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain first-stage strong magnetic scavenging concentrate and fine grain first-stage strong magnetic scavenging tailings;
performing fine-grain second-stage deironing on the fine-grain first-stage strong magnetic rough concentration concentrate and the fine-grain first-stage strong magnetic scavenging concentrate, wherein the magnetic field intensity is 2000 oersted, and obtaining fine-grain second-stage deironing concentrate and fine-grain second-stage deironing tailings;
carrying out fine grain two-stage strong magnetic roughing on the fine grain two-stage deironing tailings (the magnetic field intensity is 8000 Oersted, the rotating speed of a rotating ring is 3r/min, the pulsation frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain two-stage strong magnetic roughing concentrate (used as flotation feeding) and fine grain two-stage strong magnetic roughing tailings;
carrying out fine grain second-stage strong magnetic scavenging on the fine grain second-stage strong magnetic rougher tailings (the magnetic field intensity is 5000 oersteds, the rotating speed of a rotating ring is 3r/min, the pulse frequency is 300 times/min, and the stroke is 35mm) to obtain fine grain second-stage strong magnetic scavenged concentrate and fine grain second-stage strong magnetic scavenged tailings;
and taking the fine-grain second-stage strong magnetic rough concentrate and the fine-grain second-stage strong magnetic scavenging concentrate as flotation feeding ores.
Comparative example 1, two-stage high-intensity magnetic rougher concentrate and two-stage high-intensity magnetic scavenger concentrate (coarse-intensity concentrate in table 1), two-stage high-intensity magnetic scavenger tailing (coarse-intensity tailing in table 1), fine-grain two-stage high-intensity magnetic rougher concentrate and fine-grain two-stage high-intensity magnetic scavenger concentrate (fine-grain concentrate in table 1), and TiO in fine-grain two-stage high-intensity magnetic scavenger tailing (fine-grain tailing in table 1) 2The content of (b) was measured, and the results are shown in Table 1.
Claims (6)
1. A beneficiation method for ilmenite of the pyroxene type is characterized by comprising the following steps:
carrying out slag separation treatment on the primary iron ore dressing tailings of the pyroxene type ilmenite, and then carrying out coarse-grain primary iron removal to obtain primary iron removal concentrate and primary iron removal tailings;
performing primary strong magnetic roughing on the primary deironing tailings to obtain primary strong magnetic roughing concentrate and primary strong magnetic roughing tailings;
performing primary strong magnetic scavenging on the primary strong magnetic roughing tailings to obtain primary strong magnetic scavenging concentrate and primary strong magnetic scavenging tailings;
grading the first-stage strong magnetic roughing concentrate and the first-stage strong magnetic scavenging concentrate to obtain oversize materials and undersize materials;
performing coarse grain reselection on the oversize material to obtain coarse grain reselection concentrate and coarse grain reselection tailings;
performing coarse-grained secondary deferrization on the coarse-grained gravity concentrate to obtain secondary deferrization concentrate and secondary deferrization tailings;
performing coarse-grain second-stage strong-magnetic roughing on the second-stage deironing tailings to obtain second-stage strong-magnetic roughing concentrate and second-stage strong-magnetic roughing tailings;
carrying out coarse-grain second-stage strong-magnetic scavenging on the second-stage strong-magnetic roughing tailings to obtain second-stage strong-magnetic scavenging concentrate and second-stage strong-magnetic scavenging tailings;
Taking the second-stage strong magnetic roughing concentrate and the second-stage strong magnetic scavenging concentrate as coarse flotation feed ores;
the magnetic field intensity of the first-stage iron removal of the coarse grains and the second-stage iron removal of the coarse grains is 1000-3000 Aute independently; the magnetic field intensity of the first-section strong magnetic rough separation is 5000-10000 oersted; the magnetic field intensity of the section of strong magnetic scavenging is 3000-8000 Ottes; the aperture of the grading sieve used for grading is 0.074-0.154 mm; the magnetic field intensity of the coarse grain two-section strong magnetic roughing is 5000-10000 Aute; the magnetic field intensity of the coarse grain two-stage strong magnetic scavenging is 3000-8000 Ottes.
2. A beneficiation process according to claim 1, characterized by comprising:
carrying out slag separation treatment on the pyroxene type ilmenite second-stage iron ore tailings, and then carrying out fine-grain first-stage iron removal to obtain fine-grain first-stage iron removal concentrate and fine-grain first-stage iron removal tailings;
performing fine-grain primary strong magnetic roughing on the fine-grain primary deironing tailings to obtain fine-grain primary strong magnetic roughing concentrate and fine-grain primary strong magnetic roughing tailings;
carrying out fine-grain primary strong magnetic scavenging on the fine-grain primary strong magnetic rougher tailings to obtain fine-grain primary strong magnetic scavenged concentrate and fine-grain primary strong magnetic scavenged tailings;
performing fine grain reselection on the fine-grain first-stage strong magnetic rough concentration concentrate and the fine-grain first-stage strong magnetic scavenging concentrate to obtain fine grain reselection concentrate and fine grain reselection tailings;
Performing fine particle second-stage strong magnetic roughing on the fine particle gravity concentrate to obtain fine particle second-stage strong magnetic roughing concentrate and fine particle second-stage strong magnetic roughing tailings;
carrying out fine grain second-stage strong magnetic scavenging on the fine grain second-stage strong magnetic rougher tailings to obtain fine grain second-stage strong magnetic scavenged concentrate and fine grain second-stage strong magnetic scavenged tailings;
performing fine particle secondary iron removal on the fine particle secondary strong magnetic rougher concentrate and the fine particle secondary strong magnetic scavenging concentrate to obtain fine particle secondary iron removal concentrate and fine particle flotation feed;
carrying out strong magnetic scavenging on the fine grain gravity tailings to obtain fine grain strong magnetic scavenging concentrate and fine grain strong magnetic scavenging tailings;
returning the fine-grained strongly magnetic scavenging concentrate to fine-grained gravity separation feeding;
the magnetic field intensity of the first-stage iron removal of the fine particles is 1000-3000 Aute; the magnetic field intensity of the fine-grain section of strong magnetic rough separation is 5000-10000 Aute; the magnetic field intensity of the fine particle section strong magnetic scavenging is 3000-8000 Ott; the fine particle reselection
A spiral chute; the magnetic field intensity of the two-section fine particle strong magnetic rough separation is 5000-10000 Aute; the magnetic field intensity of the two-stage strong magnetic scavenging of the fine particles is 3000-8000 Ott; magnetic for removing iron in two sections of fine particlesThe field strength is 1000 to 3000 Ott.
3. A beneficiation process according to claim 2,
reselecting the undersize material to obtain reselected concentrate and reselected tailings;
combining the gravity concentrate and the fine gravity concentrate for fine secondary strong magnetic roughing;
strong magnetic scavenging is carried out on the gravity tailings to obtain scavenged concentrate and scavenged tailings;
and returning the scavenging concentrate to the undersize material for gravity separation feeding.
4. A beneficiation method according to claim 3, wherein the undersize material is reselected
A spiral chute; the magnetic field intensity of the gravity tailings strong magnetic scavenging is 3000-8000 Ottes.
5. A beneficiation method according to claim 1, wherein the coarse gravity concentrate is subjected to grinding treatment and then to inspection and classification, oversize products subjected to inspection and classification are returned to grinding treatment, and undersize products subjected to inspection and classification are subjected to coarse secondary iron removal; the aperture of the classifying screen for inspecting and classifying is 0.154-0.074 mm.
6. A beneficiation method according to claim 5, wherein the fineness of the ore grinding process is-0.074 mm 60% to 100%.
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