CN115301405A - System and method for pre-enriching ultra-fine ilmenite - Google Patents
System and method for pre-enriching ultra-fine ilmenite Download PDFInfo
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- CN115301405A CN115301405A CN202210939175.3A CN202210939175A CN115301405A CN 115301405 A CN115301405 A CN 115301405A CN 202210939175 A CN202210939175 A CN 202210939175A CN 115301405 A CN115301405 A CN 115301405A
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- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007885 magnetic separation Methods 0.000 claims abstract description 91
- 239000012141 concentrate Substances 0.000 claims abstract description 58
- 230000002000 scavenging effect Effects 0.000 claims abstract description 35
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 238000007667 floating Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000005188 flotation Methods 0.000 claims description 9
- 239000006148 magnetic separator Substances 0.000 claims description 7
- 239000002562 thickening agent Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 35
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004094 preconcentration Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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Classifications
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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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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of mineral separation, and particularly relates to a system and a method for pre-enriching ultra-fine ilmenite, wherein the method comprises the following steps: s1, high-intensity magnetic separation rough separation: carrying out high-intensity magnetic separation roughing on the ultra-fine ilmenite under the magnetic field intensity of 0.8-1.2T to obtain concentrate and rougher tailings; s2, high-intensity magnetic separation scavenging: and carrying out strong magnetic separation scavenging on the roughed tailings under the magnetic field intensity of 1.1-1.5T to obtain concentrate and tailings. And S1, the concentrate obtained in the step S2 is used as the final high-intensity magnetic separation concentrate, and the tailings obtained in the step S2 are used as the final high-intensity magnetic separation tailings. The invention can remove about 45 percent of tailings to float TiO of floating materials 2 Grade is improved by 6 percent and TiO 2 The recovery rate is 70-80%, and the method has the characteristics of high enrichment ratio and simple operation process.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a system and a method for pre-enriching ultra-fine ilmenite.
Background
The titanium resource reserves in China are abundant, and mainly a vanadium titano-magnetite which is a multi-metal (comprising chromium, cobalt, nickel, gallium, copper, manganese, scandium, selenium and the like) co-associated ore mainly comprising iron, vanadium and titanium. Along with the mine entering middle and deep mining, the ore property is further changed, the quality requirement of the dressing plant on iron ore concentrate is further improved, the grinding granularity of the dressing plant is increasingly fine, according to the recent data statistics of the Panxi area, the-19 mu m fraction content in the titanium resource of the Panzhihua area is about 35%, and the-10 mu m fraction content is about 15%; in order to reduce the influence of the fine-particle ilmenite in some separation plants, the-19 mu m fraction is directly discharged into tailings by a classification desliming method, so that a large amount of resources are lost. The beneficiation technology of ilmenite has been developed for many years, and currently ilmenite with a particle size of +20 μm is well utilized, but ilmenite with a particle size of-20 μm has not been effectively utilized. Therefore, strengthening the recovery work of the fine-particle ilmenite becomes the key for improving the recovery rate of the titanium separation in the plant.
The method for sorting the ilmenite comprises gravity separation, magnetic separation, electric separation and flotation. Flotation is the main sorting method of ilmenite, and ilmenite, especially fine-particle ilmenite, is difficult to be sorted to qualified grade by using methods such as gravity separation, magnetic separation and the like singly. And because the micro-fine ilmenite has the characteristics of small mass, large specific surface, high surface energy and the like, the flotation problems that the collision adhesion probability of the ilmenite and air bubbles is reduced, fine gangue minerals are easy to be mixed with concentrate to float upwards, the medicine consumption is increased and the like are caused. Therefore, the method of gravity separation, magnetic separation and the like before flotation is used for pre-enriching, so that a large amount of harmful components can be effectively removed, the subsequent flotation environment is optimized, and the medicament consumption is reduced.
Zhang Yimin discloses a 'method for mineral separation and pre-enrichment of vanadium titano-magnetite' (CN 10885583A) invention patent, which crushes the vanadium titano-magnetite, carries out strong magnetic separation to obtain mixed rough concentrate and tailings 1. And grinding the mixed rough concentrate, and performing low-intensity magnetic separation to obtain low-intensity magnetic separation concentrate and low-intensity magnetic separation tailings, wherein the tailing discarding rate can reach 50-60%.
The invention discloses a pre-enrichment method of low-grade vanadium titano-magnetite (CN 108325736A), which comprises the steps of crushing low-grade vanadium titano-magnetite raw ore, performing primary strong magnetism, performing primary weak magnetism, performing chute reselection, performing secondary strong magnetism, and finally obtaining TiO 2 Titanium rough concentrate with grade of 21-25%.
Wanghongbin disclosed in the thesis "study of preconcentration process of microfine-size ilmenite" that three-stage strong magnetic separation is performed on raw ore or strongly magnetic-separated concentrate, and the magnetic field intensity is decreased progressively, so that the concentrate with about 15% of taste, about 14% of yield and 38.92% of recovery rate is finally obtained.
The method can improve TiO in the floating material to a certain degree 2 But still has problems of complicated operation or low grade and recovery, and there is no reasonable pre-enrichment method for ultra fine-grained ilmenite.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pre-enrichment system and a pre-enrichment method for ultrafine particle grade ilmenite, which can effectively remove a large amount of harmful components and has a high enrichment ratio.
The purpose of the invention is realized by the following technical scheme:
a pre-enrichment method of ultra-fine ilmenite comprises the following steps:
s1, high-intensity magnetic separation rough separation: carrying out high-intensity magnetic separation roughing on the ultrafine ilmenite under the magnetic field intensity of 0.8-1.2T, preferably, the magnetic intensity is 0.9-1.1T, and most preferably 1T, so as to obtain concentrate and rougher tailings;
s2, high-intensity magnetic separation scavenging: and (3) carrying out strong magnetic separation scavenging on the roughed tailings under the magnetic field intensity of 1.1-1.5T, preferably the magnetic intensity is 1.2-1.4T, and most preferably 1.3T, so as to obtain concentrate and tailings. And S1, the concentrate obtained in the step S2 is used as the final high-intensity magnetic separation concentrate, and the tailings obtained in the step S2 are used as the final high-intensity magnetic separation tailings.
Further, the ultra-fine ilmenite raw ore: tiO 2 2 The grade of the product is 13-18 percent, and the grade of TFe is 14-19 percent; 75-85% of-0.018 mm TiO 2 The distribution rate is 80-90%.
Further, in step S1 and/or S2, the device selected by strong magnetic separation is a high-gradient strong magnetic separator.
Further, in step S1 and/or S2, the feeding concentration of the strong magnetic separation is 12 to 20%, and most preferably 15%.
Further, in the step S1 and/or S2, the magnetic medium of the high magnetic separation is a magnetic conductive stainless steel bar medium of 1.0-1.5 mm.
Further, in the step S1 and/or S2, the stroke frequency of the strong magnetic separation is 280-320 times/min, and the stroke is 32-38mm.
The invention also provides a system for pre-enriching the ultra-fine ilmenite, which comprises first strong magnetic separation equipment and second strong magnetic separation equipment, wherein the ultra-fine ilmenite is subjected to strong magnetic separation rough concentration in the first strong magnetic separation equipment to obtain concentrate and rough tailings, and the rough tailings enter the second strong magnetic separation equipment to be subjected to strong magnetic separation scavenging to obtain the concentrate and the tailings;
the magnetic field intensity of the first strong magnetic separation equipment is 0.8-1.2T, and the magnetic field intensity of the second strong magnetic separation equipment is 1.1-1.5T.
And further, the device also comprises a concentration tank, wherein the concentrate obtained by the first strong magnetic separation equipment and the concentrate obtained by the second strong magnetic separation equipment enter the concentration tank for concentration to obtain floating materials.
And the tailings obtained by the second strong magnetic separation equipment enter the thickener for solid-liquid separation, and the solids obtained by separation enter the filter press for filter pressing.
The beneficial effects of the invention are: the invention provides a pre-enrichment method of ultra-fine-grain ilmeniteThe method comprises the steps of subjecting the raw ilmenite with ultra-fine grain grade to a 'rough sweeping' strong magnetic separation process, and finally removing 43.65% of tailings to float TiO in the floating material 2 The grade is improved from 16.94 percent to 22.85 percent, and the grade is TiO 2 The recovery rate is 76.03 percent, the subsequent flotation operation environment can be optimized, and the medicament consumption is reduced. Therefore, the invention has the characteristics of high enrichment ratio and simple operation process.
Drawings
FIG. 1 is a process flow diagram of the pre-enrichment of the present invention;
FIG. 2 is a schematic diagram of a system for pre-enrichment according to the present invention;
in the figure, 1, a first strong magnetic separation device; 2. a second strong magnetic separation device; 3. a concentration tank; 4. a thickener; 5. and (4) a filter press.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
Experimental equipment
Referring to fig. 1 and fig. 2, the experimental selection equipment of the invention comprises a first strong magnetic separation equipment 1 and a second strong magnetic separation equipment 2, wherein both the first strong magnetic separation equipment 1 and the second strong magnetic separation equipment 2 are high-gradient strong magnetic separators, the magnetic medium of each high-gradient magnetic separator is a rod medium with the thickness of 1.0mm, the number of times of flushing is 300/min, and the stroke is 35mm.
Example 1
TiO in the ultra-fine-grain ilmenite raw ore adopted in the embodiment 2 The grade of (b) is 16.94 percent, and the TFe grade is 16.31 percent; 0.018mmTiO 2 The content accounts for 79.22%, and the distribution rate is 87.54%.
Based on the pre-enrichment system provided by the present invention, the pre-enrichment method described in this embodiment includes the following steps:
(1) Carrying out high-intensity magnetic separation roughing on the ultra-fine-grain ilmenite under the magnetic field intensity of 1.0T, wherein the ore feeding concentration is 15%, and obtaining high-intensity magnetic separation roughing concentrate and roughing tailings.
(2) And carrying out strong magnetic separation scavenging on the strong magnetic separation roughing tailings under the magnetic field intensity of 1.3T, wherein the ore feeding concentration is 15%, and obtaining strong magnetic separation scavenging tailings and scavenging concentrate.
(3) Using the high-intensity magnetic separation rough concentration and scavenging concentrate obtained in the step (2) as final concentrate, using the scavenging tailings as final tailings, and finally obtaining TiO 2 Concentrate with grade of 22.85% and recovery rate of 76.03%, and TiO 2 9.31 percent of grade and 23.97 percent of recovery rate.
Example 2
TiO in the ultra-fine-grain ilmenite raw ore adopted in the embodiment 2 The grade of (1) is 15.24 percent, and the grade of TFe is 15.99 percent; 0.018mmTiO 2 The content accounts for 74.98 percent, and the distribution rate is 85.37 percent.
Based on the pre-enrichment system provided by the present invention, the pre-enrichment method described in this embodiment includes the following steps:
(1) Carrying out high-intensity magnetic separation roughing on the ultrafine-grained ilmenite under the magnetic field intensity of 1.0T, wherein the ore feeding concentration is 19%, and obtaining high-intensity magnetic separation roughing concentrate and roughing tailings.
(2) And (3) carrying out strong magnetic separation scavenging on the strong magnetic separation roughing tailings under the magnetic field intensity of 1.3T, wherein the ore feeding concentration is 19%, and obtaining strong magnetic separation scavenging tailings and scavenging concentrate.
(3) Using the high-intensity magnetic separation rough concentration and scavenging concentrate obtained in the step (2) as final concentrate, using the scavenging tailings as final tailings, and finally obtaining TiO 2 Concentrate with grade of 21.16% and recovery rate of 73.94%, and TiO 2 8.50 percent of grade and 26.06 percent of recovery rate.
Example 3
TiO in the ultra-fine-grain ilmenite raw ore adopted in the embodiment 2 The grade of (1) is 17.38 percent, and the grade of TFe is 16.31 percent; 0.018mmTiO 2 The content of the product is 83.17%, and the distribution rate is 89.32%.
Based on the pre-enrichment system provided by the present invention, the pre-enrichment method described in this embodiment includes the following steps:
(1) Carrying out high-intensity magnetic separation roughing on the ultra-fine-grain ilmenite under the magnetic field intensity of 1.0T, wherein the ore feeding concentration is 13%, and obtaining high-intensity magnetic separation roughing concentrate and roughing tailings.
(2) And carrying out strong magnetic separation scavenging on the strong magnetic separation roughing tailings under the magnetic field intensity of 1.3T, wherein the feed concentration is 13%, and obtaining strong magnetic separation scavenging tailings and scavenging concentrate.
(3) Using the high-intensity magnetic separation rough concentration and scavenging concentrate obtained in the step (2) as final concentrate, using the scavenging tailings as final tailings, and finally obtaining TiO 2 Concentrate with grade of 23.46% and recovery of 78.51%, and TiO 2 The grade is 8.93%, and the recovery rate is 21.49%.
The results of the strong magnetic pre-enrichment experiments for examples 1-3 above are shown in the following table:
table 1 examples 1-3 experimental results of pre-enrichment by strong magnetic separation
Example 4
Compared with the embodiment 1, the difference is that the roughing magnetic field intensity is 0.8T, the scavenging magnetic field intensity, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.67% and recovery of 75.66%, and TiO 2 The grade is 9.45%, and the recovery rate is 24.34%.
Example 5
Compared with the embodiment 1, the difference is that the roughing magnetic field intensity is 1.2T, the scavenging magnetic field intensity, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.85% and recovery rate of 76.04%, and TiO 2 9.30 percent of grade and 23.96 percent of recovery rate.
Example 6
Compared with the embodiment 1, the difference is that the magnetic field intensity of the scavenging is 1.1T, the magnetic field intensity of the roughing, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.91% and recovery rate of 75.97%, and TiO 2 The grade is 9.33%, and the recovery rate is 24.03%.
Example 7
Compared with the embodiment 1, the difference is that the scavenging magnetic field intensity is 1.5T, the rough concentration magnetic field intensity, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.61% and recovery of 75.42%, and TiO 2 The grade is 9.54%, and the recovery rate is 24.58%.
The results of the strong magnetic pre-enrichment experiments for examples 4-7 above are shown in the following table:
table 2 examples 4-7 experimental results of pre-enrichment by strong magnetic separation
It can be seen from the above examples 1-7 that the pre-enrichment method of ultra-fine ilmenite according to the invention can eventually remove about 45% of the tailings and float the TiO floating into the float material 2 Grade is improved by 6 percent and TiO 2 The recovery rate is 70-80%, the subsequent flotation operation environment can be optimized, the medicament consumption is reduced, and the method has the characteristics of high enrichment ratio and simple operation process.
Comparative example 1
Compared with the embodiment 1, the difference is that the magnetic field intensity of rough concentration is 0.7T, the magnetic field intensity of scavenging, equipment, raw ore and other ore dressing conditions are the same, and TiO is finally obtained 2 Concentrate with grade of 21.06% and recovery rate of 63.99%, and TiO 2 The grade is 12.57%, and the recovery rate is 36.01%.
Comparative example 2
Compared with the embodiment 1, the difference is that the magnetic field intensity of rough concentration is 1.3T, the magnetic field intensity of scavenging, equipment, raw ore and other ore dressing conditions are the same, and TiO is finally obtained 2 Concentrate with grade of 20.99% and recovery rate of 75.89%, and TiO 2 The grade is 10.54 percent, and the recovery rate is 24.11 percent.
Comparative example 3
Compared with the embodiment 1, the difference is that the scavenging magnetic field intensity is 1.0T, the rough concentration magnetic field intensity, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 21.86% and recovery rate of 68.12%, and TiO 2 The grade is 11.44%, and the recovery rate is 31.88%.
Comparative example 4
Compared with the embodiment 1, the difference is that the magnetic field intensity of the scavenging is 1.6T, the magnetic field intensity of the roughing, the equipment, the raw ore and other ore dressing conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 21.37% and recovery rate of 73.50%, and TiO 2 The grade is 10.76%, and the recovery rate is 26.50%.
The results of the above-described pre-concentration experiments with high magnetic separation of comparative examples 1-4 are shown in the following table:
TABLE 3 Experimental results of pre-enrichment experiments of comparative examples 1-4 by strong magnetic separation
Comparative example 5
Compared with the embodiment 1, the difference is that the magnetic medium of the high-gradient magnetic separator is selected to be a rod medium with the thickness of 2.0mm, the rough concentration magnetic field intensity, the scavenging magnetic field intensity, the raw ore and other ore concentration conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.17% and recovery rate of 69.99%, and TiO 2 The grade is 10.93 percent, and the recovery rate is 30.01 percent.
Comparative example 6
Compared with the embodiment 1, the difference is only that the stroke frequency of the high-gradient magnetic separator is 300 times/min, the stroke is 10mm, the rough concentration magnetic field intensity, the scavenging magnetic field intensity, the raw ore and other ore concentration conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 21.95% and recovery rate of 70.11%, and TiO 2 The grade is 11.03%, and the recovery rate is 29.89%.
Comparative example 7
Compared with the embodiment 1, the difference is only that the stroke frequency of the high-gradient magnetic separator is 200 times/min, the stroke is 35mm, the rough concentration magnetic field intensity, the scavenging magnetic field intensity, the raw ore and other ore concentration conditions are the same, and finally the TiO is obtained 2 Concentrate with grade of 22.01% and recovery rate of 70.77%, and TiO 2 Grade (L) of a material10.87% with a recovery of 29.23%.
The results of the above-described magnetic pre-enrichment experiments for comparative examples 5-7 are shown in the following table:
TABLE 4 experimental results of pre-enrichment experiments by strong magnetic separation in comparative examples 5-7
Referring to fig. 1 and fig. 2, the invention also provides an ultra-fine ilmenite pre-enrichment system, which comprises a first strong magnetic separation device 1, a second strong magnetic separation device 2, a concentration tank 3, a thickener 4 and a filter press 5, wherein the ultra-fine ilmenite is subjected to strong magnetic separation and rough concentration in the first strong magnetic separation device 1 to obtain concentrate and rough tailings, and the rough tailings enter the second strong magnetic separation device 2 to be subjected to strong magnetic separation and scavenging to obtain the concentrate and the tailings; and the concentrate obtained by the first strong magnetic separation equipment 1 and the concentrate obtained by the second strong magnetic separation equipment 2 enter a concentration tank 3 for concentration to obtain a floating material, and the floating material is used as a flotation raw material to prepare the titanium concentrate. And the tailings obtained by the second strong magnetic separation equipment 2 enter a thickener 4 for solid-liquid separation, and the solid obtained by separation enters a filter press 5 for filter pressing. By the pre-enrichment system and the pre-enrichment method, effective pre-enrichment of the ultra-fine ilmenite can be realized.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The method for pre-enriching the ultra-fine ilmenite is characterized by comprising the following steps of:
s1, high-intensity magnetic separation rough separation: carrying out high-intensity magnetic separation roughing on the ultra-fine ilmenite under the magnetic field intensity of 0.8-1.2T to obtain concentrate and rougher tailings;
s2, high-intensity magnetic separation scavenging: and carrying out strong magnetic separation scavenging on the roughed tailings under the magnetic field intensity of 1.1-1.5T to obtain concentrate and tailings.
2. The process for the pre-enrichment of ultra-fine ilmenite as claimed in claim 1, wherein the ultra-fine ilmenite raw ore: tiO 2 2 The grade of the product is 13-18 percent, and the grade of TFe is 14-19 percent; 75-85% of-0.018 mm content, and TiO 2 The distribution rate is 80-90%.
3. The method for the pre-enrichment of ultra-fine ilmenite as claimed in claim 1, wherein in step S1 and/or S2, the strongly magnetic selection device is a high gradient strong magnetic separator.
4. The method for the pre-enrichment of ultra-fine ilmenite as claimed in claim 1, wherein the concentration of the feed ore for the strong magnetic separation in step S1 and/or S2 is 12-20%.
5. The method for the pre-enrichment of ultra-fine ilmenite as claimed in claim 1, wherein in step S1 and/or S2, the strongly magnetic medium is a 1.0-1.5mm magnetically conductive stainless steel rod medium.
6. The process according to claim 1, wherein the high magnetic separation stroke in step S1 and/or S2 is 280-320/min and the stroke is 32-38mm.
7. The process according to claim 1, wherein the concentrates from steps S1 and S2 are combined and subjected to flotation beneficiation as a float feed.
8. The system is characterized by comprising a first strong magnetic separation device (1) and a second strong magnetic separation device (2), wherein the ultra-fine ilmenite is subjected to strong magnetic separation and rough separation in the first strong magnetic separation device (1) to obtain concentrate and rough tailings, and the rough tailings enter the second strong magnetic separation device (2) to be subjected to strong magnetic separation and scavenging to obtain the concentrate and the tailings;
the magnetic field intensity of the first strong magnetic separation device (1) is 0.8-1.2T, and the magnetic field intensity of the second strong magnetic separation device (2) is 1.1-1.5T.
9. The system for the pre-enrichment of ultra-fine ilmenite as claimed in claim 8, characterized by further comprising a concentration tank (3), wherein the concentrate obtained by the first strong magnetic separation device (1) and the concentrate obtained by the second strong magnetic separation device (2) enter the concentration tank (3) for concentration to obtain floating materials.
10. The system for pre-enriching ultra-fine ilmenite according to claim 8, further comprising a thickener (4) and a filter press (5), wherein the tailings obtained from the second strong magnetic separation device (2) enter the thickener (4) for solid-liquid separation, and the solids obtained by separation enter the filter press (5) for filter pressing.
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